CN218472239U - Turnover sheet component, battery cover plate assembly and battery - Google Patents

Abstract

The utility model discloses a upset piece subassembly, battery apron assembly and battery, upset piece subassembly includes: turning over the sheet; the base is connected with the turnover sheet in a sealing manner to form an accommodating space; the elastic piece is arranged in the accommodating space and abutted between the turnover sheet and the base, and the elastic piece is suitable for deforming at a preset temperature so that the turnover sheet is turned over towards one side far away from the base. Utilize the elastic component in the heat heating accommodation space that produces when the battery overcharges to make the elastic force that the elastic component produced promote the upset piece upwards to overturn, switch on first utmost point post and second utmost point post from this, charge through triggering the fuse and interrupt.

Description

Turnover sheet component, battery cover plate assembly and battery

Technical Field

The utility model belongs to the technical field of the apron assembly technique and specifically relates to a upset piece subassembly, apron assembly and battery are related to.

Background

The overcharge of the lithium ion battery may cause the risks of explosion, fire, explosion, etc. A common solution to this is to mount explosion-proof valves and other safety devices, such as current shorting devices, on the battery. The explosion-proof valve can be opened when the internal pressure of the battery is too high so as to release the pressure of the battery; other safety devices such as current short-circuit device can utilize the upset piece to realize overcharge safety protection, and the upset piece upset down when the battery is normal, and when the pressure was too high in the battery, the upset piece can overturn up to make the battery short circuit, and then make the battery stop charging. Therefore, the turnover sheet can only play a role by triggering turnover due to high internal pressure of the battery caused by over-charging gas in the battery.

However, the gas production inside the battery varies with the degree of overcharge of the battery and the temperature, and the higher the degree of overcharge, the higher the temperature, the larger the gas production, and the larger the internal pressure of the battery. When the internal pressure of the battery reaches the pressure at which the safety device can be activated, the internal temperature of the battery may already be high, which may result in failure to prevent further reaction of the internal materials of the battery at high temperature and subsequent safety problems such as thermal runaway of the battery.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a upset piece subassembly, first upset piece can overturn under the effect of elastic component to can couple together first utmost point post and second utmost point post electricity, thereby make the battery terminate to charge when being in the overcharge state.

The utility model also provides a battery apron assembly.

The utility model discloses a battery is further proposed.

According to the utility model discloses upset piece subassembly of first aspect embodiment includes: turning over the sheet; the base is connected with the turnover sheet in a sealing mode to form an accommodating space; the elastic piece is arranged in the accommodating space and abutted against the overturning sheet and the base, and the elastic piece is suitable for deforming at a preset temperature so that the overturning sheet overturns towards one side far away from the base.

According to the utility model discloses upset piece subassembly utilizes the elastic component in the heat heating accommodation space that the battery produced when overcharging to make the elastic force that the elastic component produced promote the upset piece and upwards overturn, thereby make the battery short circuit. In the process, the turnover piece assembly does not need to act by depending on the internal pressure of the battery generated by the overcharge of the battery, but the turnover piece is turned over by sensing the heat generated by the overcharge of the battery under the action of the elastic force of the elastic piece in the accommodating space, so that the battery can be stopped to be charged when the turnover piece assembly is in a lower overcharge state, the safety problems of further reaction of the internal material of the battery at high temperature and thermal runaway and the like of the battery caused subsequently are avoided, and the charging safety is effectively improved.

According to some embodiments of the invention, the elastic member comprises: the hot melting part wraps the outer side of the elastic part and is suitable for melting at a preset temperature.

According to the utility model discloses a some embodiments, the base with the maximum separation distance between the surface that the upset piece is relative each other is h, and h satisfies the relational expression: h is more than or equal to 1mm and less than or equal to 10mm.

According to the utility model discloses a some embodiments, the upset piece deviates from one side of base is provided with first butt post.

According to some embodiments of the invention, the base is a thermally conductive base.

According to the utility model discloses battery apron assembly of second aspect embodiment includes: the first pole column, the second pole column and the overturning plate assembly are arranged, the polarity of the second pole column is opposite to that of the first pole column, and the overturning plate is electrically connected with the first pole column and suitable for being electrically connected with the second pole column at a preset temperature.

According to some embodiments of the present invention, the battery cover plate assembly further comprises: and the electric connecting piece is arranged at one end of the second pole column and is electrically connected with the second pole column, and the electric connecting piece is electrically connected with the turnover sheet at a preset temperature.

According to some embodiments of the invention, the electrical connector is formed with a second abutment post towards one side of the flip sheet.

According to some embodiments of the present invention, the battery cover plate assembly further comprises: the insulating plate is arranged on one side of the insulating plate, the first pole column is arranged on the insulating plate and electrically connected with the covering plate, the electric connecting piece is arranged on the covering plate and electrically connected with the covering plate, and the second pole column is arranged on the insulating plate.

According to the utility model discloses battery of third aspect embodiment includes: the battery comprises a shell, a battery cell and a battery cover plate assembly, wherein the shell is provided with a containing cavity and an opening communicated with the containing cavity, the battery cell is arranged in the containing cavity, and the battery cover plate assembly covers the opening.

Additional aspects and advantages of the invention 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 invention.

Drawings

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

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

FIG. 2 is a partial schematic view A of FIG. 1;

fig. 3 is a schematic structural diagram of an elastic member according to an embodiment of the present invention.

Reference numerals are as follows:

100. a battery cover plate assembly;

10. a flip-chip assembly; 11. a base; 12. turning over the sheet; 121. a first abutment post; 13. an elastic member; 131. a heat-melting section; 132. an elastic portion; 14. an accommodating space;

20. a first pole column; 30. a second pole; 40. an electrical connection; 41. a second abutment post; 50. a cover plate; 60. an insulating plate.

Detailed Description

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.

Turning plate assembly 10 according to an embodiment of the present invention is described below with reference to fig. 1-3, which provides a battery cover plate assembly 100 having the above turning plate assembly 10, and, further, provides a battery having the above battery cover plate assembly 100.

Referring to fig. 1 and 3, a flip chip assembly 10 according to an embodiment of the present invention includes: the flip piece 12, the base 11 and the elastic member 13, the base 11 and the flip piece 12 are hermetically connected to form the accommodating space 14, that is, the flip piece assembly 10 can act in a state that the battery is overcharged to short-circuit an external circuit by, for example, electrically communicating the first pole post 20 and the second pole post 30, and trigger a fuse to interrupt charging. Specifically, the flip sheet assembly 10 includes a flip sheet 12 and a base 11, the base 11 being in sealing engagement with the flip sheet 12 to form a receiving space 14. The flip sheet 12 can be flipped toward the side of the receiving space 14 (i.e., upward in the drawing) when a predetermined pressure is applied to the side facing away from the base 11, thereby electrically connecting the first pole post 20 and the second pole post 30.

Wherein, the predetermined pressure can be generated by the elastic member 13, the elastic member 13 is disposed in the accommodating space 14 and abuts between the turnover sheet 12 and the base 11, and the elastic member 13 is adapted to deform at a predetermined temperature so as to turn the turnover sheet 12 to a side away from the base 11. That is, the heat that produces when the battery overcharges makes elastic component 13 take place deformation to make upset piece 12 upset, and then make first utmost point post 20 and second utmost point post 30 electron switch on, make the battery form the short circuit at the external circuit, and then trigger the fuse and interrupt charging, can make the battery stop work at lower overcharge state, improve the battery overcharge security better.

In the preferred embodiment shown in the drawings, the turning-over piece 12 may be formed as a revolving structure, and thus, turning-over in the present invention mainly means that the turning-over piece 12 is deformed or displaced from its initial state to trigger the relevant control. For example, the turning pieces 12 may be provided so as to be elastically deformable in directions away from the base 11, respectively, thereby being elastically deformed to be concave into the accommodation space 14 in an initial state, and elastically deformed to be convex (turned) in a direction away from the accommodation space 14 after the compression spring is restored.

With continued reference to fig. 2, the flip-chip 12 may be formed with a cavity on the side facing the base 11 and having a similar profile to the base 11, the base 11 being covered at the opening of the cavity, thereby forming a receiving space 14 within the cavity. So arranged, the sealing engagement of the base 11 with the flip-chip 12 is conveniently achieved and a receiving space 14 adapted to receive the elastic member 13 is formed. Wherein the base 11 can be connected to the opening of the cavity of the turning sheet 12 by means of welding, riveting, mechanical fitting or gluing, for example.

Therefore, the elastic member 13 in the accommodating space 14 is heated by the heat generated when the battery is overcharged, so that the elastic force generated by the elastic member 13 pushes the turnover piece 12 to turn over upwards, thereby conducting the first pole post 20 and the second pole post 30, and interrupting the charging by triggering the fuse. In the process, the turnover piece assembly 10 does not need to act by depending on the internal pressure of the battery generated by the overcharge of the battery, but induces the heat generated by the overcharge of the battery, so that the turnover piece 12 is turned over under the action of the elastic force of the elastic piece 13 in the accommodating space 14, the battery can be stopped to be charged when the turnover piece assembly is in a lower overcharge state, the safety problems of further reaction of the internal materials of the battery at high temperature and thermal runaway and the like of the battery caused subsequently are avoided, and the charging safety is effectively improved.

Referring to fig. 3, the elastic member 13 includes: the heat-melting part 131 and the elastic part 132, the heat-melting part 131 wraps the outside of the elastic part 132, and the heat-melting part 131 is suitable for melting at a predetermined temperature. The elastic element 13 is low-melting point plastic and a compression spring sealed therein, the melting point of the low-melting point plastic is 50-100 ℃, for example, the low-melting point plastic is one or more of polycaprolactone plastic (PCL plastic) or ethylene-vinyl acetate copolymer plastic (EVA plastic), and the PCL plastic is preferred. Therefore, the lower the melting point of the low-melting-point plastic is, the earlier the melting can be performed, the earlier the short circuit between the first pole post 20 and the second pole post 30 is caused, the overcharge degree is reduced, and the overcharge safety of the battery is improved.

The bottom and the top of the compression spring are respectively contacted with the upper surface of the base 11 and the lower surface of the turnover sheet 12, the compression spring has no special requirement, and when the low-melting-point plastic is melted and loses the binding force on the compression spring, the compression spring can normally extend and push the turnover sheet 12 to turn.

Referring to fig. 2, the maximum distance between the surfaces of the base 11 and the turning sheet 12 facing each other is h, which satisfies the relationship: h is more than or equal to 1mm and less than or equal to 10mm. Because power battery arrangement space is limited, the utility model discloses a upset piece subassembly 10 should not occupy great space, so 11 upper surfaces of base are the distance from upset piece 12 lower surfaces is the better the less, again because, elastic component 13 self and extension need have certain space, elastic component 13 is the less, and extension length is just the less, can influence the upset of upset piece 12, so, 11 upper surfaces of base distance also can not be too little from the distance of upset piece 12 lower surfaces. For example, in the illustrated preferred embodiment, the spacing between the lower surface of the base 11 and the upper surface of the inversion sheet 12 varies with the profile of their respective surfaces, being greatest at the bottommost location of the accommodation space 14, which may be set to 3mm-7mm.

For this, the maximum distance between the surfaces of the base 11 and the inversion sheet 12 facing each other may be set to 1mm to 10mm.

As shown in fig. 2, a first abutting column 121 is disposed on a side of the turning piece 12 away from the base 11. That is, on the side of the turning sheet 12 facing away from the base 11, that is, on the side of the upper surface of the turning sheet 12, a first abutment column 121 may be formed so as to easily abut against an electrical connector 40 (shown in fig. 1 and 2) as described later to trigger the fuse to interrupt charging after the turning sheet 12 is turned upside down.

As mentioned above, the turning plate 12 may be configured to electrically connect the first pole post 20 and the second pole post 30 of the power battery after turning, and thus may be made of a conductive material, such as a metal material that is easily elastically deformable, such as aluminum or stainless steel.

Wherein the base 11 may be a heat conducting base 11. That is, during the charging process, the turnover sheet 12 is usually installed to face the inside of the battery, and the heat generated by the charging is mainly transferred into the accommodating space 14 through the base 11, so that the heat can be selected to have relatively good thermal conductivity, for example, the turnover sheet can be made of metal such as aluminum or stainless steel, so as to realize good thermal conductivity with low cost, and ensure that the generated heat can be transferred to the elastic member 13 in the accommodating space 14 in time in an overcharged state.

Of course, the through hole may be formed in the second flipping sheet 12, so that when the battery is overcharged, the high-temperature gas inside the battery enters the accommodating space 14, and the hot melting portion 131 may be melted by the high-temperature gas, thereby releasing the compression spring.

The flip assembly 10 described above may be used in a battery cover assembly 100 to operate when in a low overcharge condition to terminate charging of the battery.

As shown in fig. 1, a battery cover plate assembly 100 according to an embodiment of the present invention includes: a first pole post 20, a second pole post 30 and an inversion sheet assembly 10, the inversion sheet 12 being in electrical communication with the first pole post 20 and adapted to be in electrical communication with the second pole post 30 at a predetermined temperature. The turnover piece assembly 10 is installed to enable the turnover piece 12 to be electrically connected with the first pole post 20 in an initial state, after the elastic piece 13 in the accommodating space 14 is partially melted by heat, the turnover piece 12 is turned upwards and is electrically connected with the second pole post 30, so that the first pole post 20 is electrically communicated with the second pole post 30, a short circuit is formed outside a battery, a fuse is triggered to interrupt charging, the power battery can be stopped to be charged when the power battery is in a low overcharge state, safety problems such as battery thermal runaway caused by further reaction of materials inside the battery at high temperature and follow-up situation are avoided, and charging safety is effectively improved.

It can be understood that the turnover piece assembly 10 of the present invention can also terminate the battery charging in other manners, such as setting a switch capable of controlling the charging start and stop at the position opposite to the turnover piece 12, so as to terminate the battery charging by triggering the switch after the turnover piece 12 is turned over, etc.

As shown in fig. 1 and fig. 2, the battery cover plate assembly 100 further includes: and the electric connecting piece 40 is arranged at one end of the second pole post 30, the electric connecting piece 40 is electrically connected with the second pole post 30, and the electric connecting piece 40 is electrically connected with the overturning sheet 12 at a preset temperature. As such, the electrical connection member 40 is an electrically conductive member, i.e., a portion of the electrical connection member 40 may be electrically connected to the second pole post 30, and may be electrically connected to the electrical connection member 40 after the inversion sheet 12 is inverted, so that the first pole post 20 and the second pole post 30 may be electrically connected together through the inversion sheet 12 and the electrical connection member 40, thereby achieving short-circuiting of the battery cover assembly 100.

One of the limiting protrusion and the limiting groove is arranged on the second pole 30, the other one of the limiting protrusion and the limiting groove is arranged on the electric connecting piece 40, and the limiting protrusion and the limiting groove are in limiting fit, so that the electric connecting piece 40 and the second pole 30 can be electrically connected through the limiting fit of the limiting protrusion and the limiting groove.

And, as shown in fig. 2, a side of the electric connector 40 facing the flip sheet 12 is formed with a second abutment post 41. Like this, set up the second butt post 41 towards upset piece 12 on electric connector 40, first butt post 121 and second butt post 41 set up relatively, and when upset piece 12 overturned like this, first butt post 121 and second butt post 41 can butt each other to realize the electric connection between upset piece 12 and the electric connector 40. Moreover, the second abutting columns 41 are provided on the electrical connection members 40, so that the turning stroke of the turning sheet 12 can be reduced, that is, when the turning sheet 12 is turned, the turning sheet 12 can be directly abutted against the second abutting columns 41.

Further, as shown in fig. 1, the battery cover plate assembly 100 further includes: the cover plate 50 and the insulation plate 60, the insulation plate 60 is disposed on one side of the cover plate 50, the first pole 20 is disposed on the cover plate 50, the first pole 20 and the cover plate 50 are electrically connected, the electrical connector 40 is disposed on the cover plate 50, the flip sheet assembly 10 and the cover plate 50 are electrically connected, and the second pole 30 is disposed on the insulation plate 60. The cover plate 50 is covered above the insulating plate 60, the flip sheet assembly 10 is electrically connected with the cover plate 50, and the cover plate 50 is electrically connected with the first pole 20, so that the flip sheet assembly 10 is electrically connected with the cover plate 50. And, the second pole post 30 is disposed on the insulating plate 60 such that the second pole post 30 and the first pole post 20 are insulated from each other.

In the above embodiment, the first pole post 20 and the second pole post 30 are located on the same side, that is, the first pole post 20 and the second pole post 30 are disposed on the same battery cover assembly 100.

Of course, the first pole post 20 and the second pole post 30 may also be disposed at both ends of the battery. Specifically, the turning sheet assembly 10 is electrically connected to the cover plate 50 at one end thereof, wherein the cover plate 50 at one end is connected to the cover plate 50 at the other end through the case, and the cover plate 50 at the other end is electrically connected to the first pole post 20, so that selective electrical connection of the first pole post 20 and the second pole post 30 can be achieved through the cover plates 50 at both ends of the battery, the case, the turning sheet assembly 10, and the electrical connection members 40.

The utility model discloses battery of third aspect embodiment, include: shell, electric core and battery apron assembly 100, the shell have hold the chamber and with hold the opening of chamber intercommunication, electric core set up in holding the intracavity, the opening part is located to battery apron assembly 100 lid. Wherein, electric core sets up in the shell, and electric core and the relative setting of battery apron assembly 100, the high temperature that produces when making the battery overcharge like this can directly transmit for upset piece subassembly 10, thereby make hot melt portion 131 melt, so that elasticity portion 132 produces the elastic force, and butt upset piece 12, make upset piece 12 overturn the back through upset piece 12, electric connector 40 and apron 50 with first utmost point post 20 and second utmost point post 30 electricity be connected, thereby with the battery short circuit, and then realize preventing of battery and fill the function.

The short-circuit device provided by the present invention is further described in detail below by taking specific experiments as examples and combining the drawings.

Example 1: the turnover sheet 12 and the base 11 are both made of aluminum metal. The distance from the upper surface of the base 11 to the lower surface of the turning piece 12 is 3mm. The elastic element 13 is PCL plastic and a compression spring enclosed therein. The base 11 is a cylindrical base 11. The connection and fixation mode of the turnover sheet 12 and the base 11 adopts glue joint. Thereby, the flip sheet assembly 10A1 is manufactured.

The lithium cobaltate is used as a positive electrode active material to manufacture a positive plate, the graphite is used as a negative electrode active material to manufacture a negative plate, the ceramic diaphragm is used as a diaphragm, the turnover plate assembly 10A1 is assembled into the cover plate 50, and the liquid is injected to package the novel lithium ion battery S10.

Example 2: the turnover piece 12 and the base 11 are both made of aluminum metal. The distance from the upper surface of the base 11 to the lower surface of the turning piece 12 is 5mm. The elastic element 13 is PCL plastic and a compression spring enclosed therein. The base 11 is a circular truncated cone shaped bottom. The connection and fixation mode of the turnover sheet 12 and the base 11 adopts glue joint. Thereby, the flip sheet assembly 10A2 is manufactured.

The lithium cobaltate is used as a positive electrode active material to manufacture a positive plate, the graphite is used as a negative electrode active material to manufacture a negative plate, the ceramic diaphragm is used as a diaphragm, the turnover plate assembly 10A2 is assembled into the cover plate 50, and the liquid is injected and packaged into the novel lithium ion battery S20.

Example 3: the turnover sheet 12 and the base 11 are both made of aluminum metal. The distance from the upper surface of the base 11 to the lower surface of the turning piece 12 is 7mm. The elastic element 13 is PCL plastic and a compression spring enclosed therein. The base 11 is cylindrical in shape. The connection and fixation mode of the turnover sheet 12 and the base 11 adopts glue joint. Thereby, the flip sheet assembly 10A3 is manufactured.

The lithium cobaltate is used as a positive electrode active material to manufacture a positive electrode sheet, the graphite is used as a negative electrode active material to manufacture a negative electrode sheet, the ceramic diaphragm is used as a diaphragm, the turnover sheet assembly 10A3 is assembled into the cover plate 50, and the liquid is injected and packaged into the novel lithium ion battery S30.

Comparative example 1: the battery sample DS10 was produced by the method of example 1, except that the inversion sheet 12 used was a conventional inversion sheet 12.

The DS10 battery adopting the traditional turnover piece 12 has the circuit fuse fused out after the 40 th minute to stop charging, but the internal short circuit of the battery is serious due to too high overcharge degree, the heat and gas of the battery are continuously accumulated along with the continuous generation of the internal reaction of the battery, and finally the explosion-proof valve is opened at the 46 th minute and is ignited and exploded at the 47 th minute. In the S10 battery adopting the turnover sheet 12, as the internal temperature of the battery rapidly rises during overcharge, the elastic piece 13PCL plastic in the sealed space of the turnover sheet 12 is melted, the compression spring is stretched to push the turnover sheet 12 to turn over, and the external circuit of the battery is short-circuited in 24 th minute, so that the fuse is fused, and the charging is terminated.

In the description of the present invention, 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", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

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

Claims (10)

1. An inversion sheet assembly, comprising:

turning over the sheet;

the base is connected with the turnover sheet in a sealing manner to form an accommodating space;

the elastic piece is arranged in the accommodating space and abutted against the overturning sheet and the base, and the elastic piece is suitable for deforming at a preset temperature so that the overturning sheet overturns towards one side far away from the base.

2. The flip sheet assembly of claim 1, wherein the resilient member comprises: the hot melting part wraps the outer side of the elastic part and is suitable for melting at a preset temperature.

3. The flip sheet assembly of claim 1, wherein the base and the surface of the flip sheet opposite each other have a maximum spacing h that satisfies the relationship: h is more than or equal to 1mm and less than or equal to 10mm.

4. The flip sheet assembly of claim 1, wherein a side of the flip sheet facing away from the base is provided with a first abutment post.

5. The flip sheet assembly of claim 1, wherein the base is a thermally conductive base.

6. A battery cover plate assembly, comprising:

a first pole column;

the second pole column has the opposite polarity to the first pole column;

the flip sheet assembly of any one of claims 1-5, said flip sheet being in electrical connection with said first pole post and adapted to be in electrical connection with said second pole post at a predetermined temperature.

7. The battery cover plate assembly of claim 6, further comprising: the electric connecting piece is arranged at one end of the second pole column and is electrically connected with the second pole column, and the turnover sheet is electrically connected with the electric connecting piece at a preset temperature.

8. The battery cover plate assembly of claim 7, wherein a side of the electrical connector facing the flip sheet is formed with a second abutment post.

9. The battery cover plate assembly of claim 6, further comprising: apron and insulation board, the insulation board set up in one side of apron, first utmost point post set up in the apron just with the apron electricity is connected, upset piece subassembly set up in the apron just with the apron electricity is connected, the second utmost point post set up in the insulation board.

10. A battery, comprising:

a housing having a receiving cavity and an opening communicating with the receiving cavity;

the battery cell is arranged in the accommodating cavity;

the battery cover plate assembly of any of claims 6-9, disposed over the opening.

Images