CN116207457B

CN116207457B - Top cap, battery and consumer

Info

Publication number: CN116207457B
Application number: CN202310500413.5A
Authority: CN
Inventors: 林法稳; 房森基; 黄婷; 张瑞朋; 李勇军; 陈圣立
Original assignee: Jiangsu Zenergy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2023-05-06
Filing date: 2023-05-06
Publication date: 2023-07-25
Anticipated expiration: 2043-05-06
Also published as: CN116207457A

Abstract

The utility model relates to a top cover, a battery and electric equipment, wherein the top cover comprises: a top cover sheet provided with a pole hole in a thickness direction thereof; the pole is fixed on the top cover plate and comprises a pole body and a second safety part which are connected, the second safety part comprises a second fusing part, and the sectional area of the second fusing part is smaller than that of the pole body; the switching piece comprises a first connecting part and a first safety part, the first connecting part comprises a pole connecting area and at least one pole lug connecting area, and the second safety part extends out of the pole hole and is fixed on the pole connecting area; the first safety part is positioned in the pole connection area or the pole lug connection area and comprises at least one first fusing part, and the sectional area of the first fusing part is smaller than that of the first connection part. Wherein, the sum of the sectional areas S1 of all the first fusing parts is set as S1', and S1' is smaller than S2. The utility model provides a multi-stage protection structure for the battery and prevents secondary connection of the fusing part of the battery.

Description

Top cap, battery and consumer

Technical Field

The utility model relates to the technical field of batteries, in particular to a top cover, a battery and electric equipment.

Background

At present, power batteries are widely applied to the market, and for safety reasons, a safety structure is usually arranged on a switching sheet inside the battery, and the cross-sectional area of the structure is smaller, so that the overcurrent area is relatively smaller, the resistance is larger, and when the battery is internally shorted, the temperature of the structure is instantaneously raised to be fused, so that a current loop is disconnected.

However, when the battery is deformed by external force, the safety structure may be connected again, thereby jeopardizing the battery safety, especially under the loading requirement of the inverted battery when the module is optimized for improving the energy density of the battery pack.

In order to solve the above problems, there are:

a connection assembly for a secondary battery, as disclosed in chinese patent application (CN 208256795U), includes a connection tab and an insulator. The connecting piece comprises a first connecting part and a second connecting part, and the second connecting part is arranged at the lateral side of the first connecting part along the transverse direction; the second connecting portion comprises a first connecting region, a fusing region and a second connecting region, wherein the first connecting region is connected with the first connecting portion, and the fusing region is connected with the first connecting region and the second connecting region. The insulator includes a first insulating portion covering the first connection region and the fuse region, and a second insulating portion connected to the first insulating portion and extending to one surface of the first connection portion.

The prior art has the following defects:

1. when the current is abnormal, such as instantaneous high current, the fusing area of the second connecting part fuses to perform self protection; however, when the battery is inverted, the top cover of the battery faces downwards, and under the conditions of self weight of the battery core and vibration of a vehicle, secondary connection can occur at the fusing area, so that the problems of fire explosion and the like occur;

2. when the battery is applied to a new energy automobile, collision occurs or the battery deforms after external force is applied, secondary connection can occur in a fusing area, so that problems such as fire explosion and the like occur, and new potential safety hazards are brought.

In summary, how to reliably and effectively prevent the secondary connection at the fusing position of the safety structure is a problem to be solved.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model discloses a top cover, a battery and electric equipment.

The technical scheme adopted by the utility model is as follows:

a top cap comprising: a top cover sheet provided with a pole hole in a thickness direction thereof; the pole is fixed on the top cover sheet and comprises a pole body and a second safety part which are connected, the second safety part comprises a second fusing part, and the sectional area S2 of the second fusing part is smaller than the sectional area of the pole body; the switching piece comprises a first connecting part and a first safety part, the first connecting part comprises a pole connecting area and at least one pole lug connecting area, and the second safety part extends out of the pole hole and is fixed in the pole connecting area; the first safety part is positioned in the pole connection area or the pole lug connection area, and comprises at least one first fusing part, and the sectional area S1 of the first fusing part is smaller than the sectional area of the first connection part. Wherein, the sum of the sectional areas S1 of all the first fusing parts (603) is set to be S1', S1' smaller than S2.

In some embodiments, S1' and S2 satisfy the relationship: s2= (1.15 to 1.6) ×s1'.

In some embodiments, further comprising an insulating member; the insulating member includes a second insulator; the second insulating piece is provided with an isolating layer protruding towards the direction of the top cover piece, and the outer edge of the isolating layer is clamped in the pole hole; the isolation layer is provided with a first through hole, and the second safety part extends out of the first through hole.

In some embodiments, around the first through hole, the second insulating member is provided with a first protrusion protruding in a direction away from the top cover sheet, the first protrusion abutting the rotation piece.

In some embodiments, the adapter plate is formed with a second through hole along the thickness direction of the adapter plate; the second safety part further comprises a second connecting part, one end of the second connecting part is connected with the second fusing part, and the opposite end extends into the second through hole and is matched with the second through hole; the sectional area of the second connecting part is smaller than the sectional area of the pole body and larger than the sectional area.

In some embodiments, a second protrusion is formed around the second through hole, and the second protrusion abuts the isolation layer.

In some embodiments, the protective element further comprises an annular body formed with a third through hole, the second safety portion extending into and cooperating with the third through hole; the annular body is provided with a third protruding part around the third through hole, and the third protruding part abuts against the isolation layer; and/or around the first through hole, the second insulating piece is provided with a first protruding part, the first protruding part protrudes away from the direction of the top cover plate, and the first protruding part abuts against the annular body.

In some embodiments, the device further comprises a limiting element, wherein a first surface and a second surface are formed opposite to each other in the height direction of the limiting element, the first surface is in insulation abutting connection with the pole body, and the second surface is in abutting connection with the rotating sheet.

In some embodiments, the material of the limiting element is one or more of aluminum nitride, aluminum oxide, boron nitride, silicon carbide, magnesium oxide, zinc oxide, and zirconium oxide.

In some embodiments, the insulating member further includes a first insulating member, the first insulating member is sleeved on the pole body, and insulatively fixes the pole body to the top cover sheet.

A battery, comprising: a housing having an open end; the battery cell is arranged in the shell; and the top cover is buckled at the opening end of the shell.

A powered device comprising a battery as described above.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

1. according to the top cover, the first fusing part of the switching piece and the overcurrent area of the second fusing part of the pole are related, so that the first fusing part of the switching piece can keep high sensitivity, and the second fusing part of the pole can further improve the safety of the battery. Specifically: after the battery is abnormal, the first fusing part can fuse immediately, and the current loop is disconnected, so that the safety of the battery is ensured; meanwhile, if the first fusing part is connected by accident and secondarily after fusing, the battery is out of control, a few kiloamperes of extra-large current is generated, the second fusing part is fused instantly, the current loop is disconnected again, and the condition of the battery is prevented from being continuously deteriorated.

2. The top cover is arranged at a position close to the second fusing part of the pole, the second insulating part is provided with the protruding part, the protruding part is abutted against the adapter piece, or the limiting element is sleeved between the second fusing part of the pole and the second insulating part, so that the limiting element is abutted against the adapter piece, and the second insulating part is welded and fixed with the pole, so that after the second fusing part is fused under high current, the battery deforms even if the battery is subjected to external force, the abutting part can support the pole parts below and above the second fusing part to limit and separate the second fusing part and the adapter piece, secondary connection of the fusing position is effectively prevented, and the safety of the battery is improved.

3. The top cover is arranged at a position close to the second fusing part of the pole, the second insulating part or the protective element is provided with the protruding part, so that the second insulating part is propped against the protective element, or a limiting element can be sleeved between the second fusing part of the pole and the second insulating part, so that the limiting element is propped against the protective element, and the second insulating part is welded and fixed with the pole.

Drawings

In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings.

Fig. 1 is one of the exploded views of the top cover of the present utility model.

FIG. 2 is a second exploded view of the top cover of the present utility model.

Fig. 3 is a partial cross-sectional view of fig. 2.

FIG. 4 is a third exploded view of the top cover of the present utility model.

Fig. 5 is a partial cross-sectional view of fig. 4.

Fig. 6 is a schematic view of a first structure of a pole in the present utility model.

Fig. 7 is a schematic view of a second structure of the pole in the present utility model.

Fig. 8 is a schematic structural view of a second insulating member in the present utility model.

Fig. 9 is an enlarged schematic view at a in fig. 8.

Fig. 10 is a schematic structural view of a limiting element in the present utility model.

Fig. 11 is a schematic view of a first construction of the transfer tab of the present utility model.

Fig. 12 is a schematic view of a second construction of the transfer tab of the present utility model.

Fig. 13 is a schematic view of a third construction of the transfer tab of the present utility model.

Fig. 14 is a schematic view of a first view of a protective element according to the present utility model.

Fig. 15 is a schematic structural view of the protection element according to the present utility model at a second viewing angle.

Description of the specification reference numerals:

1. a pole; 101. a pole body; 102. a second safety part; 1021. a second fusing part; 1022. a second connecting portion; 1023. a first step; 1024. a flange;

2. a first insulating member;

3. a top cover sheet;

4. a second insulating member; 401. an isolation layer; 402. a first boss; 403. a first through hole;

5. a limiting element;

6. a transfer sheet; 601. a post connection region; 602. a tab connection region; 603. a first fusing part; 604. a second through hole; 605. a second protruding portion;

7. a protection element; 701. an annular body; 702. a third boss; 703. a third through hole; 704. and a second step.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.

The foregoing and other features, aspects and advantages of the present utility model will become more apparent from the following detailed description of the embodiments, read in conjunction with the accompanying drawings. The directional terms mentioned in the following embodiments are, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the drawings. Thus, directional terminology is used for the purpose of illustration and is not intended to be limiting of the utility model, and furthermore, like reference numerals refer to like elements throughout the embodiments.

Example 1:

as shown in connection with fig. 1, 8, 11 and 13, a top cover comprises:

a top cover sheet 3 provided with a pole hole in the thickness direction thereof;

the pole 1 is fixed on the top cover plate 3 and comprises a pole body 101 and a second safety part 102 which are connected, the second safety part 102 comprises a second fusing part 1021, and the sectional area S2 of the second fusing part 1021 is smaller than the sectional area of the pole body 101;

an insulating member including a second insulator 4; the second insulating piece 4 is provided with an isolating layer 401 protruding towards the direction of the top cover sheet 3, and the outer edge of the isolating layer 401 is clamped in the pole hole; the isolation layer 401 is provided with a first through hole 403, and the second safety part 102 extends out of the first through hole 403;

the switching piece 6 comprises a first connecting part and a first safety part, wherein the first connecting part comprises a pole connecting area 601 and at least one pole lug connecting area 602, and the second safety part 102 extends out of the pole hole and is fixed on the pole connecting area 601; the first protection portion is located in the pole connection region 601, and the first protection portion includes at least one first fusing portion 603, and a cross-sectional area S1 of the first fusing portion 603 is smaller than a cross-sectional area of the first connection portion.

In fig. 11 and 13, the first connection portion includes a pole connection region 601 and a pole connection region 602, and the pole connection regions 602 are symmetrically disposed on two sides of the pole connection region 601. As shown in fig. 11, the first fuse portion is located in the pole connection region 601, and the number of the first fuse portions 603 is one; as shown in fig. 13, the first fuse portion is located in the tab connection region 602, and each tab connection region 602 is correspondingly provided with a first fuse portion 603. Of course, the pole connection region 601 may be provided with a plurality of first fuse portions 603, and the plurality of first fuse portions 603 may be formed in parallel or may be formed in a staggered manner.

Let the sum of the sectional areas S1 of all the first fuse portions 603 be S1', S1' smaller than S2.

Note that, regardless of the configuration of the changeover piece 6 shown in fig. 11 or the configuration of the changeover piece 6 shown in fig. 13, the sum of the sectional areas S1 of all the first fusing portions 603 is S1', S1' smaller than S2.

The top cover provided in this embodiment forms reliable and effective multi-stage protection by providing the first fusing part 603 and the second fusing part 1021 on the adapter plate 6, when the second connection occurs at the fusing position of the first fusing part 603 after fusing, the battery is out of control and has thousands of amperes of extra-large current, the second fusing part 1021 is fused instantly, and the current loop is disconnected again, so as to avoid the continuous deterioration of the battery condition.

Taking fig. 11 as an example, the implementation principle is specifically described: the overcurrent area S1 of the first fusing part 603 is smaller than the overcurrent area S2 of the second fusing part 1021, meaning that the current required to fuse the first fusing part 603 is smaller than the current required to fuse the second fusing part 1021. When the inside of the battery is abnormal, a large current passes through the first fusing part 603, and the first fusing part 603 is fused in the millisecond level (generating relatively near kiloamperes) of the instantaneous large current, so that a current loop is disconnected; under the condition that the battery is deformed by external force or is in an inverted loading working condition, the first fusing part 603 is connected secondarily, a battery loop is communicated again, the battery is in a high-temperature environment at this time, the minimum overcurrent surface is not limited to the first fusing part 603, thousands of amperes of extra-large current in a runaway state can occur, the second fusing part 1021 is instantaneously fused (namely the pole 1 is blown), the current loop is disconnected, the first fusing part 603 of the adapter piece 6 can keep high sensitivity, and the second fusing part 1021 of the pole 1 can further improve the safety of the battery.

In this embodiment, the height of the second fusing part 1021 is L, and the value of L ranges from 0.5mm to 2.0mm. The second fusing part 1021 is provided only on the electrode post having a lower melting point in the battery. For example, in the conventional battery, the material of the positive electrode post is aluminum, the melting point of aluminum is 660.4 ℃, the material of the negative electrode post is copper-aluminum composite, that is, the upper portion of the negative electrode post is aluminum, the lower portion of the negative electrode post is copper, the melting point of copper is 1083.4 ℃, and it can be seen that the melting point of copper is much higher than that of aluminum, and if the second fusing part 1021 is provided on the negative electrode post, even if the battery is abnormal due to the overcurrent problem, the second fusing part 1021 provided on the negative electrode post is still not fused, so the second fusing part 1021 is provided in the positive electrode post of the battery.

The pole body 101 and the second safety part 102 may be integrally formed, or the pole body 101 and the second safety part 102 may be fixedly connected by laser welding.

In this embodiment, the second insulating member 4 is a plastic sheet member, and is mounted on the lower surface of the top cover sheet 3, so as to insulate the battery cell from the top cover sheet 3. The "lower surface" herein means the surface of the top cover sheet 3 close to the battery cell. Of course, in some embodiments, the second insulator 4 may not be employed, but other forms of insulation such as a coated insulating material may be employed.

In the present embodiment, S1' and S2 satisfy the relation: s2= (1.15 to 1.6) ×s1'. Wherein, 1.15-1.6 is the safety coefficient set by the utility model. In the embodiment, the safety coefficient of 1.15-1.6 is set, and on the basis that S1 'is smaller than S2, the sizes of S1' and S2 are related, so that the sensitivity and the safety of the multi-stage protection structure can be further ensured.

In the present embodiment, the thickness of the switching piece 6 is in the range of 0.6mm to 2.2mm.

Referring to fig. 7 and 11, in the present embodiment, the adapter plate 6 is formed with a second through hole 604 in the thickness direction of the adapter plate 6;

the second safety part 102 further includes a second connecting part 1022, one end of the second connecting part 1022 is connected to the second fusing part 1021, and the opposite end extends into the second through hole 604 and forms a fit with the second through hole 604;

the second connection portion 1022 has a cross-sectional area smaller than that of the post body 101 and larger than that of the second fusing portion 1021. When the battery is abnormal, the second fusing part 1021 can be fused, and the second connecting part 1022 is not fused.

Further, the second safety portion 102 further includes a flange 1024, and when the second connecting portion 1022 extends into the second through hole 604 and is engaged with the second through hole 604, the flange 1024 is engaged with the second through hole 604 of the adapter piece 6. Specifically, as shown in FIG. 3, the width of the flange 1024 is w, which ranges from 0.2mm to 1.5mm.

The assembly method of the present embodiment is as follows:

the pole 1 is fixed on the top cover 3 in an insulating manner, the second insulating member 4 is placed under the top cover 3, the first through hole 403 of the second insulating member 4 corresponds to the pole hole of the top cover 3, the adapter sheet 6 is placed under the top cover 3, the second through hole 604 of the adapter sheet 6 corresponds to the pole hole of the top cover 3, the pole 1 passes through the pole hole, the first through hole 403 and the second through hole 604, and finally the adapter sheet 6 and the pole 1 are fixed by laser welding, however, the fixing manner of the adapter sheet 6 and the pole 1 can also adopt other welding manners or manners of riveting by expansion materials, but overcurrent cannot be ensured, and if the overcurrent is not ideal, the second fusing part 1021 has the risk of fusing.

Example 2:

this embodiment substantially corresponds to embodiment 1, except that, as shown in fig. 3 and 8, the second insulating member 4 is provided with a first boss 402 around the first through hole 403, and the first boss 402 projects in a direction away from the top sheet 3, the first boss 402 abutting the rotation sheet 6. It should be noted that, the second insulating member 4 insulates and protects the pole portion above the second fusing part 1021 of the pole 1, so as to ensure that the second fusing part 1021 is the only overcurrent position of the pole 1, and after the second fusing part 1021 fuses, any possibility of contact between the pole 1 at the upper and lower parts of the second fusing part 1021 is avoided. Specifically, the protrusion height of the first protrusion 402 is 0.1mm to 1.5mm.

Even after the second fusing part 1021 is fused by a large current or the battery is deformed after being subjected to external force, the propped part of the first protruding part 402 and the adapter piece 6 can also support the pole 1 parts below and above the second fusing part 1021 to limit and separate the two parts, so that secondary connection of the fusing position is effectively prevented, and the safety of the battery is improved.

In this embodiment, the insulating member further includes a first insulating member 2, where the first insulating member 2 is sleeved on the pole body 101, and insulates and fixes the pole body 101 to the top cover 3. Specifically, the first insulating member 2 has a substantially annular shape, the first insulating member 2 is sleeved on the pole 1, and the first insulating member 2 is formed between the pole 1 and the top cover sheet 3 by injection molding, so as to fix the pole 1 on the top cover sheet 3 and insulate the pole 1 from the top cover sheet 3.

Example 3:

this embodiment is basically identical to embodiment 1, except that the adapter plate 6 is provided with a second boss 605 around the second through hole 604, the second boss 605 being in insulating abutment with the post body 101. The second boss 605 may be insulated from the post body 101 by an insulating layer, which may be a coated insulating material or an external insulator. For example, the spacer 401 may act as an insulator, i.e. the second boss 605 abuts the spacer 401.

Example 4:

the present embodiment is basically identical to embodiment 1, except that the second insulating member 4 in the present embodiment is provided with a first protruding portion 402, and the adapter sheet 6 is formed with a second protruding portion 605, wherein the first protruding portion 402 abuts against the adapter sheet 6, and the second protruding portion 605 abuts against the separator 401.

Specifically, the first protruding portion 402 has a protruding height of 0.1mm to 1.5mm, and the second protruding portion 605 has a height of 0.1mm to 1.5mm.

Example 5:

this embodiment is substantially identical to embodiment 1, except that the top cover provided in this embodiment further comprises a limiting element 5. As shown in fig. 10, a first surface and a second surface are formed opposite to each other in the height direction of the stopper element 5, the first surface abutting against the post body 101, and the second surface abutting against the tab 6. Specifically, the material of the limiting element 5 is one or more of aluminum nitride, aluminum oxide, boron nitride, silicon carbide, magnesium oxide, zinc oxide and zirconium oxide, so that it can be seen that the limiting element 5 is resistant to high temperature, and even if the second fusing part 1021 melts, the limiting element 5 can not be affected by high temperature, and can always play a supporting role, and further secondary connection of the fused second fusing part 1021 is prevented.

The assembly method of the present embodiment is as follows:

the pole 1 is fixed on the top cover 3 in an insulating way, the second insulating piece 4 is placed under the top cover 3, the first through hole 403 of the second insulating piece 4 corresponds to the pole hole of the top cover 3, the limiting element 5 is placed in the first through hole 403 of the second insulating piece 4, the switching piece 6 is placed under the top cover 3, the second through hole 604 of the switching piece 6 corresponds to the pole hole of the top cover 3, the pole 1 passes through the pole hole, the first through hole 403 and the second through hole 604, and finally the switching piece 6 and the pole 1 are fixed through laser welding.

Example 6:

this embodiment is substantially identical to embodiment 1, except that the top cover provided by this embodiment further comprises a protective element 7. As shown in fig. 14 and 15 in combination, the protection element 7 includes an annular body 701, the annular body 701 is formed with a third through hole 703, and the second securing portion 102 extends into the third through hole 703 and cooperates with the third through hole 703;

around the third through hole 703, the annular body 701 is provided with a third protruding portion 702, the third protruding portion 702 abutting the isolation layer 401; and/or

Around the first through hole 403, the second insulating member 4 is provided with a first protruding portion 402, and the first protruding portion 402 protrudes away from the direction of the top cover sheet 3, the first protruding portion 402 abutting against the annular body 701.

Specifically, the thickness H of the protection member 7 (excluding the height of the third boss 702): the height of the third protruding portion 702 ranges from 0.6mm to 2.2mm, and the range of the value is 0.15mm to 1.0mm.

Further, the second connection portion 1022 is provided with the first step 1023, the annular body 701 is provided with the second step 704, after the pole 1 and the protection element 7 are fixedly connected, the second connection portion 1022 is connected with the annular body 701, the first step 1023 and the second step 704 are oppositely arranged to form a connection area of the second connection portion 1022 and the annular body 701, so that the second connection portion 1022 and the third through hole 703 form a fit, a plane is formed at the connection position of the second connection portion 1022 and the third through hole, and the existence of the plane can ensure that the lower surface flatness of the second safety portion 102 of the pole 1 is not affected if the protrusion or the unevenness exists after the protrusion or the unevenness exists when the laser seam welding is generated when the pole 1 and the protection element 7 are fixedly connected by adopting laser welding.

As can be appreciated, the bonding of the switching piece 6 to the lower surface of the second safety portion 102 is not affected in the subsequent battery assembly process, and the operation space of the production and assembly process is enlarged. The lower surface of the second safety portion 102 is herein understood to be the state that the pole 1 assumes after the assembly of the pole 1 and the protection element 7.

In addition, as shown in fig. 12, the post connection region 601 in this embodiment is not provided with a second through hole 604.

The assembly method of the present embodiment is as follows:

the pole 1 is fixed on the top cover 3 in an insulating way, the second insulating piece 4 is aligned with the pole hole of the top cover 3, the limiting element 5 is placed in the first through hole 403 of the second insulating piece 4, the center of the protecting element 7 is aligned with the part of the pole 1 below the second fusing part 1021 of the pole 1, the second insulating piece 4 and the limiting element 5 are pressed down, the protecting element 7 and the pole 1 are fixed by laser welding, and finally the switching piece 6 and the pole 1 are fixed by welding.

Or alternatively

The pole 1 is fixed on the top cover 3 in an insulating way, the second insulating piece 4 is aligned with the pole hole of the top cover 3, the center of the protection element 7 is aligned with the part of the pole 1 below the second fusing part 1021 of the pole 1, the second insulating piece 4 is pressed down, the protection element 7 and the pole 1 are fixed by laser welding, and finally the switching piece 6 and the pole 1 are fixed by welding.

Of course, other welding methods or riveting methods by expansion material can be adopted for fixing the protection element 7 and the pole 1, but overcurrent cannot be ensured, and if the overcurrent is not ideal, the second fusing part 1021 is not fused.

From examples 1 to 6, it is understood that: if the switching piece 6 is provided with the second through hole 604, the fixing manner of the pole 1 and the switching piece 6 is as follows: one end of the second connecting portion 1022 is connected to the second fusing portion 1021, and the opposite end extends into the second through hole 604 and forms a fit with the second through hole 604; if the switching piece 6 has no second through hole 604, the fixing manner of the pole 1 and the switching piece 6 is as follows: the pole 1 is directly welded and fixed to the pole connection region 601.

Example 7:

a battery, comprising:

a housing having an open end;

the battery cell is arranged in the shell; the battery cell is formed by winding a positive plate, a diaphragm and a negative plate;

and the top cover provided in any one of embodiments 1-6 is fastened to the open end of the housing.

The utility model also provides electric equipment comprising the battery provided in the embodiment 7. The main design key point of the utility model is that the structure of the top cover is improved, and other structures of the electric equipment, such as an electric connection part and a mechanical structure part of the electric equipment are not repeated.

The electric equipment can be an automobile, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The automobile can be a fuel oil automobile, a fuel gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the utility model does not limit the electric equipment in particular. In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present utility model will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.

Claims

1. A top cap, comprising:

a top cover sheet (3) provided with a pole hole along the thickness direction thereof;

the pole (1) is fixed on the top cover sheet (3) and comprises a pole body (101) and a second safety part (102) which are connected, wherein the second safety part (102) comprises a second fusing part (1021), and the sectional area S2 of the second fusing part (1021) is smaller than the sectional area of the pole body (101);

the switching piece (6) comprises a first connecting part and a first safety part, wherein the first connecting part comprises a pole connecting area (601) and at least one pole lug connecting area (602), and the second safety part (102) extends out of the pole hole and is fixed on the pole connecting area (601); the first safety part is positioned in the pole connection area (601) or the pole lug connection area (602), and comprises at least one first fusing part (603), and the sectional area S1 of the first fusing part (603) is smaller than the sectional area of the first connection part;

wherein, the sum of the sectional areas S1 of all the first fusing parts (603) is set to be S1', S1' smaller than S2.

2. The overcap of claim 1, wherein S1' and S2 satisfy the relationship: s2= (1.15 to 1.6) ×s1'.

3. The top cover according to claim 1, further comprising an insulating member comprising a second insulator (4); the second insulating piece (4) is provided with an isolating layer (401) protruding towards the direction of the top cover sheet (3), and the outer edge of the isolating layer (401) is clamped in the pole hole; the isolation layer (401) is provided with a first through hole (403), and the second safety part (102) extends out of the first through hole (403).

4. A top cover according to claim 3, characterized in that around the first through hole (403), the second insulating member (4) is provided with a first protrusion (402), and the first protrusion (402) protrudes away from the direction of the top cover sheet (3), the first protrusion (402) abutting the adapter piece (6).

5. A top cover according to claim 3, wherein the adapter piece (6) is formed with a second through hole (604) along the thickness direction of the adapter piece (6);

the second safety part (102) further comprises a second connecting part (1022), one end of the second connecting part (1022) is connected with the second fusing part (1021), and the opposite end extends into the second through hole (604) and is matched with the second through hole (604);

the second connection portion (1022) has a cross-sectional area smaller than that of the post body (101) and larger than that of the electrode (1021).

6. The top cover according to claim 5, characterized in that around the second through hole (604), the adapter piece (6) is formed with a second protrusion (605), the second protrusion (605) abutting the isolating layer (401).

7. The overcap of claim 5, wherein the cap comprises a top cap,

-a protection element (7) comprising an annular body (701), said annular body (701) being formed with a third through hole (703), said second safety portion (102) extending into said third through hole (703) and forming a fit with said third through hole (703);

-around the third through hole (703), the annular body (701) is provided with a third protrusion (702), the third protrusion (702) abutting the isolation layer (401); and/or

Around the first through hole (403), the second insulating member (4) is provided with a first protruding portion (402), and the first protruding portion (402) protrudes away from the direction of the top cover sheet (3), and the first protruding portion (402) abuts against the annular body (701).

8. The top cover according to claim 1, further comprising a limiting element (5) formed with a first surface and a second surface opposite in height, the first surface being in insulating abutment with the pole body (101) and the second surface being in abutment with the adapter tab (6).

9. The top cover according to claim 8, wherein the material of the limiting element (5) is one or more of aluminum nitride, aluminum oxide, boron nitride, silicon carbide, magnesium oxide, zinc oxide and zirconium oxide.

10. A top cover according to claim 3, wherein the insulating member further comprises a first insulating member (2), the first insulating member (2) is sleeved on the pole body (101), and the pole body (101) is fixed to the top cover sheet (3) in an insulating manner.

11. A battery, comprising:

a housing having an open end;

the battery cell is arranged in the shell;

and the top cover of any one of claims 1-10 snapped onto the open end of the housing.

12. A powered device comprising the battery of claim 11.