CN112490595A

CN112490595A - Electric connection assembly, battery and electric equipment

Info

Publication number: CN112490595A
Application number: CN202011231549.3A
Authority: CN
Inventors: 喻聪; 冷利民; 陈代松; 徐中领
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-03-12
Anticipated expiration: 2040-11-06
Also published as: CN112490595B

Abstract

The application discloses an electric connection assembly, a battery and electric equipment, wherein the electric connection assembly comprises a fuse and a PTC (positive temperature coefficient) protection device, and the fuse comprises a first connection part, a fusing part and a second connection part which are sequentially arranged; PTC protection device includes the main part parallelly connected with fusing portion, and the main part has the chamber that holds that link up, and at least fusing portion is located and holds the intracavity, and is formed with accommodation space between fusing portion and the PTC protection device. Among the electric connection component of this application embodiment, the main part has the chamber that holds that link up, and fusing portion is located and holds the intracavity, is formed with accommodation space between fusing portion and the PTC protection device, and after fusing portion fusing, the piece of production can remain in accommodation space, avoids the piece to fall into the battery and leads to there being the potential safety hazard.

Description

Electric connection assembly, battery and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to an electric connection assembly, a battery and electric equipment.

Background

In order to improve the safety performance of the lithium ion secondary battery, the lithium ion secondary battery generally has a FUSE (FUSE). The fuse is the alloy thin slice of high conductivity low melting point, and internal resistance is extremely low, can fuse rapidly under heavy current in order to cut off the electric connection of rolling core and battery lamina tecti, however, the piece that produces when the fuse fuses probably falls into the battery, leads to there being the potential safety hazard.

Disclosure of Invention

The present application is directed to solving at least one of the problems in the prior art. Therefore, the application provides an electric connection assembly, can avoid the piece to fall into inside the battery, reduces the potential safety hazard.

The application also provides a battery comprising the electric connection assembly and electric equipment comprising the battery.

An electrical connection assembly according to an embodiment of the first aspect of the present application, comprising:

the fuse comprises a first connecting part, a fusing part and a second connecting part which are arranged in sequence;

PTC protection device, include with the parallelly connected main part of fusing portion, the main part has the chamber that holds that link up, at least fusing portion is located hold the intracavity, just fusing portion with be formed with accommodation space between the PTC protection device.

According to the electric connection assembly of the embodiment of the application, at least the following beneficial effects are achieved:

the main part has the chamber that holds that link up, and fusing portion is located and holds the intracavity, is formed with accommodation space between fusing portion and the PTC protection device, and after fusing portion fusing, the piece of production can remain in accommodation space, avoids the piece to fall into the battery and leads to there being the potential safety hazard.

According to some embodiments of the present application, the main body is sleeved outside the fusing part, the first connecting part is located on one side of the main body, and the second connecting part is located on the other side of the main body opposite to the main body.

According to some embodiments of the present application, the fusing part has the receiving space along both sides of the thickness direction of the body and along both sides of the width direction of the body.

According to some embodiments of the application, along the width direction of the main body, the accommodating cavity is wider than the fusing part, along the thickness direction of the main body, a first groove and a second groove are arranged on the wall of the accommodating cavity, the first groove is located above the fusing part, and the second groove is located below the fusing part.

According to some embodiments of the application, the fuse further comprises a third connecting portion and a fourth connecting portion, one end of the third connecting portion is connected with the first connecting portion, the other end of the third connecting portion stretches into the accommodating cavity, the fusing portion is connected with the accommodating cavity wall, the fourth connecting portion is attached to the accommodating cavity wall, one end of the fourth connecting portion is connected with the second connecting portion, and the other end of the fourth connecting portion stretches into the accommodating cavity, the fusing portion is connected with the accommodating cavity wall, and the accommodating cavity wall is attached to the accommodating cavity wall.

According to some embodiments of the present disclosure, the fusing part includes a plurality of sub fusing parts, and each of the sub fusing parts is distributed in parallel along a width direction of the main body with a gap between adjacent sub fusing parts.

According to some embodiments of the present application, each of the sub fusing parts has the receiving space along both sides of the thickness direction of the main body and along both sides of the width direction of the main body.

According to some embodiments of the present application, the PTC protection device further comprises a reinforcing part located in the gap and connected to the main body at both ends thereof in a thickness direction of the main body.

A battery according to an embodiment of the second aspect of the present application, comprising:

the battery cell is provided with a lug;

the battery top cover is provided with a pole column corresponding to the pole lug;

the electric connection assembly, first connecting portion with utmost point post is connected, the second connecting portion with it connects to correspond utmost point ear.

According to the third aspect embodiment of this application, the electric equipment comprises the battery.

Additional aspects and advantages of the present application 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 present application.

Drawings

The present application is further described with reference to the following figures and examples, in which:

FIG. 1 is a perspective view of an electrical connection assembly according to an embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of section A-A of FIG. 1;

FIG. 3 is a cross-sectional view of section B-B of FIG. 1;

FIG. 4 is an exploded view of a battery according to an embodiment of the present application;

fig. 5 is a schematic cross-sectional view of the battery of fig. 4, which conceals the cell and the casing.

Detailed Description

Reference will now be made in detail to embodiments of the present application, 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 drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means 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 present application. 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.

Among the correlation technique, roll up and have the fuse between core and the battery top cap usually, can fuse rapidly when passing through the heavy current in the fuse to cut off the electric connection of rolling up core and battery lamina tecti, however, can produce the piece when the fuse fuses, the piece probably falls into the battery, has the safety risk. Based on the aforesaid, this application provides an electrical connection component, and the piece that produces after the fuse melts will remain in the accommodation space between PTC and fuse, avoids the piece to fall into in the battery and leads to there being the potential safety hazard. The electrical connection assembly according to the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 3, the electrical connection assembly of the embodiment of the present application includes a fuse 100 and a PTC protection device 200, where the fuse 100 includes a first connection portion 110, a fusing portion 120, and a second connection portion 130 that are sequentially disposed, the first connection portion 110 and the second connection portion 130 are used for realizing connection between the electrical connection assembly and a battery core and a battery top cover, and when a large current flows through the fuse 100, the fuse 100 is fused at the fusing portion 120, so as to break electrical connection between the battery core and the battery top cover. The PTC protection device 200 includes a main body 210, the main body 210 has a through accommodating cavity 220, at least the fusing part 120 is located in the accommodating cavity 220, and an accommodating space 230 is formed between the fusing part 120 and the PTC protection device 200, when the fusing part 120 is fused, the generated debris is stored in the accommodating space 230, and the debris is prevented from falling into the battery, thereby causing potential safety hazards.

The fuse 100 is a thin plate made of high conductivity low melting point alloy, and the fuse material can be made by using the known technology. The fuse 100 in the embodiment shown in fig. 1 has a substantially rectangular structure, and includes a first connecting portion 110 at one end (e.g., the rear end shown in fig. 1) of the fuse 100, a second connecting portion 130 at the other end (e.g., the front end shown in fig. 1), and a fusing portion 120 between the first connecting portion 110 and the second connecting portion 130. The first connection portion 110 may be configured to be connected to a tab of a battery cell, and includes two connection ends 111 in order to adapt to a tab shape having two connection portions. The second connection portion 130 may be used for connection with a pole of a battery top cap.

The PTC protection device 200 (positive temperature coefficient thermistor) may be made of a known temperature-sensitive polymer composite material, and its resistance value increases instantaneously by several hundred times or even several thousand times as the temperature increases. The main body 210 may be a sleeve structure adapted to the shape of the fusing part 120, for example, a sleeve structure having a rectangular cross section, the fusing part 120 is located in the accommodating cavity 220, and one end (for example, the rear end shown in fig. 1) of the PTC protection device 200 is connected to the first connection part 110, and the other end (for example, the front end shown in fig. 1) is connected to the second connection part 130, so as to be connected in parallel with the fusing part 120. Because the internal resistance of the PTC protection device 200 is much greater than that of the fuse, when the battery works normally, the fuse 100 short-circuits the PTC protection device 200, and the current is conducted mainly through the fuse 100, so that even if the resistance value of the PTC protection device 200 changes due to the temperature rise, the internal resistance of the battery is not affected. When the battery is abnormal, so that the current passing through the fuse 100 is increased, the fuse 100 is fused, the current passes through the PTC protection device 200, and the temperature of the PTC protection device 200 is sharply increased under the influence of the fused heat of the fuse 100 and the heat generated when the current passes through, so that the resistance value is sharply increased, the current limiting function is achieved, and the battery is protected. In addition, the PTC protection device 200 may be made of a suitable polymer composite material, and after the fuse 100 is fused, the PTC protection device 200 may allow a smaller current to pass through, but may not completely cut off the current, so that the discharge of the battery cell may be realized, and the safety failure risk of the battery cell in a high overshoot state in the subsequent transportation or treatment process may be avoided.

When the fusing part 120 is located in the accommodating cavity 220, an accommodating space 230 is formed between the fusing part 120 and the main body 210, for example, the accommodating space 230 may be formed between the fusing part 120 and a cavity wall of the accommodating cavity 220. Since the main body 210 covers the outside of the fuse 120 and the main body 210 have the accommodating space 230, the debris generated after the fuse is also retained inside the main body 210, and the debris can be reduced or even prevented from falling into the battery.

Referring to fig. 1, in the electrical connection assembly, the main body 210 is sleeved outside the fusing part 120, the first connection part 110 is located at one end (for example, the rear end shown in fig. 1) of the main body 210, and the second connection part 130 is located at the other end (for example, the front end shown in fig. 1) opposite to the main body, so that the first connection part 110 and the second connection part 130 are conveniently connected to the battery cell and the battery top cover.

Referring to fig. 2 and 3, in the electrical connection assembly, the fuse portion 120 has the receiving space 230 on both sides (e.g., upper and lower sides in fig. 3) in the thickness direction of the main body 210 and on both sides (e.g., left and right sides in fig. 2) in the width direction of the main body 210, so that the fuse portion 120 and the main body 210 can be connected in parallel, and the volume of the debris storage space can be enlarged.

Referring to fig. 2 and 3, in the electrical connection assembly, the receiving cavity 220 is wider than the fusing part 120 in the width direction of the main body 210, and when the fusing part 120 is centrally disposed in the receiving cavity 220, receiving spaces 230 can be formed between the left and right cavity walls of the receiving cavity 220 and the fusing part 120. The upper cavity wall of the accommodating cavity 220 has a first groove 240, and the lower cavity wall has a second groove 250, when the fusing part 120 is placed in the accommodating cavity 220, the first groove 240 is located above the fusing part 120, the second groove 250 is located below the fusing part 120, that is, along the thickness direction of the main body 210, both sides of the fusing part 120 also have accommodating spaces 230. The first and

second grooves

240 and 250 may be rectangular grooves, the size of the first and

second grooves

240 and 250 is equal to the size of the receiving cavity 220 along the width direction of the main body 210, and the size of the first and

second grooves

240 and 250 is wider than the size of the fuse 120 along the length direction (e.g., the front-back direction shown in fig. 3) of the main body 210, so that the fuse 120 can be completely covered.

Referring to fig. 1 and 3, in the electrical connection assembly, in order to realize the connection between the main body 210 and the first and

second connection portions

110 and 130, the fuse 100 further includes a third connection portion 140 and a fourth connection portion 150, wherein a rear end of the third connection portion 140 is connected to the first connection portion 110, and a front end thereof extends into the accommodating cavity 220, is connected to a rear end of the fusing portion 120, and is attached to a cavity wall of the accommodating cavity 220. The front end of the fourth connecting portion 150 is connected to the second connecting portion 130, and the rear end extends into the accommodating cavity 220, is connected to the front end of the fusing portion 120, and is attached to the wall of the accommodating cavity 220. Thus, the connection between the main body 210 and the first and

second connection portions

110 and 130 and the parallel connection between the main body 210 and the fuse portion 120 can be realized, and the third and

fourth connection portions

140 and 150 can close the front and rear openings of the accommodating cavity 220, so that the accommodating cavity 220 is entirely sealed, and the chips are further prevented from falling into the battery.

In order to connect the PTC protection device 200 to the fuse 100, the main body 210 may be divided into an upper housing and a lower housing, for example, and after the upper housing and the lower housing are sleeved on the fuse 100, the upper housing and the lower housing are connected into a whole by hot pressing or the like.

Referring to fig. 1, in the electrical connection assembly, the widths of the second connection portion 130, the third connection portion 140 and the fourth connection portion 150 are equal to each other and smaller than the width of the first connection portion 110, the main body 210 is sleeved on the outer sides of the fuse portion 120, a portion of the third connection portion 140 and a portion of the fourth connection portion 150, and the width of the main body 210 is not greater than the width of the first connection portion 110, so as to prevent the electrical connection assembly from forming a protruding structure in the width direction.

Referring to fig. 1, in the electrical connection assembly, the fuse portion 120 includes a plurality of sub fuse portions 121, and in an example shown in fig. 2, includes two sub fuse portions 121. The sub fusing parts 121 are distributed in parallel along the width direction of the main body 210, and a gap 122 is formed between adjacent sub fusing parts 121. In this way, the cross-sectional area of the sub fusing parts 121 is reduced to facilitate the fusing acceleration, and the gap 122 may also serve as a receiving space 230 for storing debris, that is, in the present embodiment, a part of the receiving space 230 is formed between adjacent sub fusing parts 121. It can be understood that the number of the sub fusing parts 121 may be other, such as three, etc.

Referring to fig. 2 and 3, in the electrical connection assembly, the accommodating spaces 230 are respectively formed at two sides of each sub-fusing part 121 along the thickness direction of the main body 210 and at two sides of each sub-fusing part 121 along the width direction of the main body 210, so that the sub-fusing parts 121 and the main body 210 can be connected in parallel, and the accommodating spaces 230 distributed around the sub-fusing parts 121 can also store the fragments generated during fusing.

Referring to fig. 2, in the above-described electrical connection assembly, the PTC protecting device 200 further includes a reinforcing part 260, the reinforcing part 260 is located in the gap 122, and both ends of the reinforcing part 260 are connected to the main body 210 in the thickness direction of the main body 210, thereby increasing the strength of the electrical connection assembly, that is, in the present embodiment, a part of the receiving space 230 is formed between the sub fusing part 121 and the reinforcing part 260. In this embodiment, the fusing part 120 includes two sub-fusing parts 121, and the reinforcing part 260 is located in the middle of the gap 122.

Referring to fig. 4 and 5, the present application further discloses an exemplary battery, which includes a battery cell 300, a battery top cap 400, a housing 500, a CID device 600, a tab connecting piece 700, an explosion-proof valve 800, and a sealing nail 900, wherein the battery cell 300 is located inside the housing 500, the explosion-proof valve 800 and the sealing nail 900 are connected to the battery top cap 400, and the battery top cap 400 is used for closing an opening of the housing 500. The battery cell 300 has tabs, specifically a first tab 310 and a second tab 320. Battery top cap 400 has the utmost point post, specifically first utmost point post 410 and second utmost point post 420, in addition, battery top cap 400 still has first utmost point post riveting piece 430, second utmost point post riveting piece 440, first utmost point post 410 is connected with first utmost point post riveting piece 430 electrically conductive, second utmost point post 420 is connected with second utmost point post riveting piece 440 electrically conductive, CID device 600's left end and right-hand member are all fixed, and the right-hand member passes through top cap 400 and is connected with first utmost point post 410 electrically conductive, the left end then with second utmost point post 420, second utmost point post riveting piece 440 is insulating. Thus, when the battery is in the state shown in fig. 5, the first pole column 410 and the second pole column 420 are not shorted, and the battery can operate normally. When the battery is abnormal, the internal air pressure is increased to drive the CID device 600 to turn upwards until the CID device 600 contacts the second pole riveting block 440, and then the first pole 410 and the second pole 420 are short-circuited through the CID device 600 and the top cover 400. It is understood that other known battery configurations may be employed in the present embodiment in addition to the battery configuration described above.

The battery further comprises the above electrical connection assembly, wherein the electrical connection assembly is connected between one set of poles and the tabs, the tab connection piece 700 is connected between the other set of poles and the tabs, for example, the first connection portion 110 is connected with the first tab 310, the second connection portion 130 is connected with the first pole 410, one end (for example, the front end shown in fig. 4) of the tab connection piece 700 is connected with the second pole 320, and the other end (for example, the rear end shown in fig. 4) of the tab connection piece 700 is connected with the second pole 420, when the first pole 410 and the second pole 420 are in short circuit, the fuse portion 120 is fused, the temperature of the PTC protection device 200 is sharply increased, so that the resistance value is sharply increased, the current limiting effect is achieved, and the battery protection.

The application also discloses an electric device using the battery, wherein the electric device can be an automobile and the like.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims

1. An electrical connection assembly, comprising:

2. The electrical connection assembly of claim 1, wherein the main body is sleeved outside the fusing part, the first connecting part is located on one side of the main body, and the second connecting part is located on the other opposite side of the main body.

3. The electrical connection assembly as claimed in claim 1, wherein the fusing part has the receiving space at both sides in a thickness direction of the body and at both sides in a width direction of the body.

4. The electrical connection assembly as claimed in claim 3, wherein the receiving cavity is wider than the fuse portion along a width direction of the main body, and a wall of the receiving cavity has a first groove and a second groove along a thickness direction of the main body, the first groove is located above the fuse portion, and the second groove is located below the fuse portion.

5. The electrical connection assembly of claim 4, wherein the fuse further comprises a third connecting portion and a fourth connecting portion, one end of the third connecting portion is connected to the first connecting portion, the other end of the third connecting portion extends into the accommodating cavity, is connected to the fusing portion, and is attached to the wall of the accommodating cavity, one end of the fourth connecting portion is connected to the second connecting portion, and the other end of the fourth connecting portion extends into the accommodating cavity, is connected to the fusing portion, and is attached to the wall of the accommodating cavity.

6. The electrical connection assembly of claim 1, wherein the fusing part comprises a plurality of sub fusing parts, and each sub fusing part is arranged in parallel along the width direction of the main body, and a gap is formed between adjacent sub fusing parts.

7. The electrical connection assembly as claimed in claim 6, wherein each of the sub fusing parts has the receiving space at both sides in a thickness direction of the main body and at both sides in a width direction of the main body.

8. The electrical connection assembly according to claim 6, wherein the PTC protection device further comprises a reinforcing portion located in the gap and connected to the main body at both ends thereof in a thickness direction of the main body.

9. A battery, comprising:

the battery cell is provided with a lug;

the electrical connection assembly of any one of claims 1 to 8, said first connection portion being connected to said tab and said second connection portion being connected to said corresponding said post.

10. An electrical device comprising the battery of claim 9.