CN111490190B

CN111490190B - Battery cover plate, battery and vehicle

Info

Publication number: CN111490190B
Application number: CN201910072991.7A
Authority: CN
Inventors: 胡世超
Original assignee: BYD Co Ltd
Current assignee: Changsha Fudi Battery Co Ltd; BYD Co Ltd
Priority date: 2019-01-25
Filing date: 2019-01-25
Publication date: 2021-08-10
Anticipated expiration: 2039-01-25
Also published as: WO2020151473A1; CN111490190A

Abstract

The invention discloses a battery cover plate, a battery and a vehicle, wherein the battery cover plate comprises: the cover plate comprises a cover plate main body, a first electrode, a second electrode and an air cavity communicated with the gas in the battery, wherein the cover plate main body is provided with a connecting part, the first electrode is electrically connected with the connecting part, the air cavity comprises a side wall arranged along the vertical direction, at least part of the side wall is a deformable part, the deformable part is electrically connected with the second electrode, and the gas in the air cavity drives the deformable part to deform when the pressure is increased so as to enable the deformable part to be electrically connected with the connecting part and realize the electrical connection between the first electrode and the second electrode. According to the battery cover plate disclosed by the invention, when the battery is in an abnormal state such as an overcharged state, gas in the battery can enter the gas cavity to push the deformable part to deform so as to be connected with the connecting part, and short-circuit connection protection of the first electrode and the second electrode of the battery is realized.

Description

Battery cover plate, battery and vehicle

Technical Field

The invention relates to the technical field of batteries, in particular to a battery cover plate, a battery and a vehicle.

Background

In the related art, two connection terminals are led out from a battery cover plate, one of the connection terminals is electrically connected with a cover plate main body, and the other connection terminal is welded with a bowl-shaped turnover structural member. When the battery is in an abnormal condition, such as an overcharge state, gas in the battery generates pressure for pushing the overturning structural member to overturn upwards so as to enable the positive electrode and the negative electrode of the battery to be conducted, short circuit of the battery is realized, internal energy of the battery is released after short circuit, meanwhile, a charging loop is in short circuit, and charging is stopped.

In the above technical solution, the following disadvantages exist: the power F that upset structure upset upwards is the inside pressure P of battery multiplied by the lifting surface S, and the inside pressure of battery is certain when overcharging, needs to increase lifting surface and realizes the upset of upset structure, from this, can occupy the battery apron space, can't realize when apron space hour. Moreover, the turnover structural member is welded on the cover plate to occupy a certain cover plate space, and is difficult to apply under the condition of limited space of the battery cover plate.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a battery cover plate which has an overcharge protection function and is simple and compact in structure.

The invention also provides a battery, which comprises the battery cover plate.

The invention also provides a vehicle which comprises the battery.

According to the embodiment of the present invention, the battery cover plate includes: a cover main body having a connection part; the first electrode and the second electrode are respectively arranged on the cover plate main body, and the first electrode is electrically connected with the connecting part; the gas cavity is communicated with gas inside the battery and comprises side walls arranged in the vertical direction, at least part of the side walls are deformable parts, the deformable parts are electrically connected with the second electrode, and the gas in the gas cavity drives the deformable parts to deform when the pressure is increased so as to enable the deformable parts to be electrically connected with the connecting part and realize the electrical connection between the first electrode and the second electrode.

According to the battery cover plate provided by the embodiment of the invention, the air cavity communicated with the air in the battery is arranged, so that the air in the battery can enter the air cavity when the battery is in an abnormal condition, such as an overcharged state, the air entering the air cavity can generate an acting force for pushing the deformable part, the deformable part is deformed and is electrically connected with the connecting part, the short-circuit connection of the first electrode and the second electrode of the battery is realized, and the battery releases energy and is disconnected from charging the battery. Through the arrangement, the safety performance of the battery under abnormal conditions is greatly improved, and the whole structure of the battery cover plate is compact and reasonable.

According to some embodiments of the invention, the cover plate body is provided with an assembly hole, the assembly hole is located between the first electrode and the second electrode, the air cavity is provided in the assembly hole, the air cavity has a first axis extending in an up-and-down direction, the air cavity comprises a side wall formed by rotating and extending around the first axis, at least a part of the side wall is the deformable member, and the side wall is in clearance fit with the assembly hole when the deformable member is not deformed.

In some embodiments of the present invention, the battery cap plate further comprises: the protection casing, the protection casing with the apron main part is connected and the cover is located the outside of deformable spare.

According to some embodiments of the invention, the shield is provided with an air hole in communication with the outside air.

According to some embodiments of the invention, the deformable member is located radially outward of the second electrode, the deformable member and the second electrode cooperating to define the air cavity.

In some embodiments of the present invention, the air cavity is formed as one extending in a circumferential direction of the second electrode; or the air cavities are multiple and are arranged at intervals along the circumferential direction of the second electrode.

According to some embodiments of the invention, the second electrode is provided with a gas channel for communicating the gas cavity and the cell interior.

In some embodiments of the invention, the gas channel comprises: a first vent segment extending axially of the second electrode; a second vent segment in communication with the first vent segment, the second vent segment extending in a radial direction of the second electrode.

According to some embodiments of the invention, a centerline of the first vent segment coincides with an axis of the second electrode.

In some embodiments of the invention, an outer peripheral wall of the second electrode opposite to the deformable member is partially recessed inward in a radial direction to form a recessed portion, upper and lower ends of the deformable member are respectively connected to the second electrode, and the deformable member and the recessed portion together define the air cavity.

According to some embodiments of the invention, a longitudinal section of the deformable member is formed in an arc shape convex toward the second electrode.

In some embodiments of the present invention, the battery cover plate is provided with a sinking groove, a through hole is formed in a bottom wall of the sinking groove, and the second electrode is disposed through the sinking groove and the through hole.

According to some embodiments of the invention, further comprising a first insulator, the connecting portion comprises: a first extension electrically connected with the rest of the cap plate body; the second extension section and the first extension section form an included angle; the third extension section is parallel to the first extension section, the first extension section and the third extension section are respectively connected with two ends of the second extension section, the deformable part can be in contact with the third extension section in a deformation mode, the third extension section is provided with an accommodating groove, and the first insulating part is arranged in the accommodating groove.

In some embodiments of the invention, the electrode further comprises a second insulator, the second electrode being provided with a circumferentially extending support, the second insulator being located between the third extension and the support.

According to some embodiments of the invention, at least one of the deformable member and the cover body is provided with a coating having a resistance of 1 milliohm-3 milliohms.

According to some embodiments of the invention, the second electrode comprises: go up utmost point post and utmost point post down, go up utmost point post with one of utmost point post is equipped with the boss down, another be equipped with the recess of boss looks adaptation.

In some embodiments of the present invention, the first electrode is in insulated fit with the cap body, the second electrode is in insulated fit with the cap body, and the first electrode is electrically connected to the connection portion through a tab.

According to some embodiments of the invention, the first electrode is electrically connected to the cover plate body and the second electrode is in insulative engagement with the cover plate body.

A battery according to an embodiment of the present invention includes: a housing; the battery cover plate is the battery cover plate, and the cover plate main body is connected with the shell to define a closed cavity; the battery cell is arranged in the cavity.

According to the battery provided by the embodiment of the invention, the air cavity communicated with the air in the battery is arranged, so that the air in the battery can enter the air cavity when the battery is in an abnormal condition, such as an overcharged state, the air entering the air cavity can generate an acting force for pushing the deformable part, the deformable part is deformed and is electrically connected with the connecting part, the short-circuit connection of the first electrode and the second electrode of the battery is realized, and the battery releases energy and is disconnected from charging the battery. Through the arrangement, the safety performance of the battery under abnormal conditions is greatly improved, and the whole structure of the battery cover plate is compact and reasonable.

According to an embodiment of the invention, a vehicle includes: the battery is the battery.

According to the vehicle provided by the embodiment of the invention, by arranging the battery, when the battery of the vehicle is in an abnormal condition, such as an overcharged state, the first electrode and the second electrode of the battery can be protected by short-circuit connection, so that the safety performance of the battery under the abnormal condition is greatly improved, and the safety performance of the vehicle is improved.

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 partial structural sectional view of a battery cap plate according to an embodiment of the present invention;

fig. 2 is a partial structural view of a battery cover plate according to an embodiment of the present invention;

fig. 3 is a sectional view of a battery cover plate according to an embodiment of the present invention;

fig. 4 is an exploded view of a portion of the structure of portion a circled in fig. 3;

fig. 5 is a partial structural view of a battery cover plate according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of a battery according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a battery according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a battery according to an embodiment of the present invention;

fig. 9 is a schematic structural view of a battery cover plate according to another embodiment of the present invention;

FIG. 10 is a front view of the battery cover plate shown in FIG. 9;

FIG. 11 is a cross-sectional view of section A-A shown in FIG. 10;

fig. 12 is an enlarged partial structural view of a portion B circled in fig. 11;

fig. 13 is a schematic structural diagram of a vehicle according to an embodiment of the invention.

Reference numerals:

the position of the vehicle 1111 is determined,

the battery 1000 is provided with a battery pack,

the battery cap plate 100 is provided with a battery cap,

the cover plate comprises a cover plate main body 10, a connecting part 110, a first extending section 111, a second extending section 112, a third extending section 113, a containing groove 1130, a groove 101, a through hole 102, an assembling hole 103,

first electrode 21, second electrode 22, recessed portion 2200, upper pole 2201, lower pole 2202, boss 2203, recess 2204, support portion 221, deformable member 222, air cavity 223, aluminum cap 224,

the first insulating member 31, the second insulating member 32, the insulating member 33,

a cell 40, a first tab 410, a second tab 420,

a first lead tab 51, a second lead tab 52,

the liquid injection hole is provided with a sealing nail 60,

the anti-explosion valve 70 is provided with a valve body,

the housing (80) is provided with a plurality of through holes,

the protective cover 90 is provided with a protective cover,

a gas passage S10, a first ventilation section S11, a second ventilation section S12 and a gas outlet A1.

Detailed Description

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

In the description of the present invention, it is to be understood that the terms "central," "upper," "lower," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The battery cover 100, the battery 1000, and the vehicle according to the embodiment of the invention are described below with reference to fig. 1 to 13.

As shown in fig. 3 and 5, according to the battery cap plate 100 of the embodiment of the present invention, the battery cap plate 100 includes: a cap main body 10, a first electrode 21, a second electrode 22, and an air chamber 223 communicating with the gas inside the battery 1000.

Specifically, as shown in fig. 1 to 4, the cap main body 10 has a connection portion 110, the first electrode 21 and the second electrode 22 are respectively provided on the cap main body 10, and the first electrode 21 is electrically connected to the connection portion 110. It should be noted that the first electrode 21 may be directly electrically connected to the cover main body 10 to realize the electrical connection between the first electrode 21 and the connection portion 110; the connection position of the first electrode 21 and the cap main body 10 may be in insulation fit, and the first electrode 21 is electrically connected to the connection portion 110 through a tab. The first electrode 21 and the second electrode 22 are electrically connected to the battery cell 40 of the battery 1000, and the battery 1000 may be electrically connected to other components through the first electrode 21 and the second electrode 22. The first electrode 21 and the second electrode 22 may be a positive electrode and a negative electrode of the battery 1000.

The air chamber 223 includes sidewalls disposed in the up-down direction. As shown in fig. 1 and 2, the "up-down direction" described herein may be understood as the inward-outward direction of the battery cap plate 100. The side wall provided with the air cavity 223 extends along the up-down direction, so that the fixed connection of the side wall of the air cavity 223 is facilitated, the occupied space of the air cavity 223 can be reduced, and the structure of the battery cover plate 100 is more compact and reasonable.

At least part of the side wall is the deformable member 222, that is, the side wall of the air cavity 223 may be entirely formed as the deformable member 222, and the side wall of the air cavity 223 may also be partially formed as the deformable member 222. It should be noted that the "deformable element 222" described herein can be understood as a deformable component having deformation performance. For example, when the deformable member 222 is subjected to a force, the deformable member 222 may be deformed accordingly in a certain direction.

As shown in fig. 1, 2 and 4, the deformable member 222 is electrically connected to the second electrode 22, and the gas in the gas cavity 223 drives the deformable member 222 to deform when the pressure increases, so that the deformable member 222 is electrically connected to the connection portion 110, and the first electrode 21 and the second electrode 22 are electrically connected.

It should be noted that, when the battery 1000 is in an abnormal state, such as an overcharged state, the gas pressure in the battery 1000 increases, the gas in the battery 1000 may enter the gas cavity 223, and the gas entering the gas cavity 223 generates a pressure to push the deformable member 222, so as to drive the deformable member 222 to deform and be electrically connected to the connection portion 110, thereby achieving the electrical connection between the first electrode 21 and the second electrode 22, and causing a short circuit of the battery 1000. After the battery 1000 is short-circuited, part of the energy is released and the charging of the battery 1000 is disconnected.

In the prior art, as in patent publication No. 103022403a, the deformable member is disposed in a horizontal direction perpendicular to the up-down direction (where the horizontal direction is perpendicular to the up-down direction or parallel to the plane of the cover plate), and the deformable member is turned over in the up-down direction when deformed, in this design, due to the limitation of the space of the cover plate of the battery, the area of the deformable member cannot be made large, on one hand, under the condition of a certain air pressure inside the battery, the area of the deformable member is small, the force is small, and the deformable member cannot be deformed in time, on the other hand, the area of the deformable member is small, the overcurrent capacity is small, and the deformable member is easily fused; in the present application, the deformable member 222 is disposed in the vertical direction, and the height of the deformable member 222 in the vertical direction is adjustable, so that the stressed area of the deformable member 222 is easily increased, and under the condition that the air pressure inside the battery 1000 is constant, the deformable member 222 is large in area and large in stress, and the deformable member 222 can be deformed in time to contact the connecting portion 110, so that the first electrode 21 and the second electrode 22 are short-circuited.

According to the battery cover plate 100 of the embodiment of the invention, by arranging the air cavity 223 communicated with the air inside the battery 1000, when the battery 1000 is in an abnormal state, such as an overcharged state, the air inside the battery 1000 can enter the air cavity 223, and the air entering the air cavity 223 can generate an acting force for pushing the deformable member 222, so that the deformable member 222 is deformed and electrically connected with the connecting part 110, and the short-circuit connection of the first electrode 21 and the second electrode 22 of the battery 1000 is realized, so that the battery 1000 releases energy and the charging of the battery 1000 is disconnected. Through the arrangement, the safety performance of the battery 1000 under abnormal conditions is greatly improved, and the overall structure of the battery cover plate 100 is compact and reasonable.

The shape of the air chamber 223 is not particularly limited in the present application, and the position where the air chamber 223 is disposed in the cover main body 10 is not particularly limited.

According to some embodiments of the present invention, as shown in fig. 11 and 12, the cap body 10 may be provided with a fitting hole 103, the fitting hole 103 being located between the first electrode 21 and the second electrode 22, and an air chamber 223 being provided in the fitting hole 103. Thereby, layout design of the air cavity 223 is facilitated.

As shown in fig. 12, the air cavity 223 has a first axis extending in the up-down direction, and the air cavity 223 includes a sidewall formed by extending rotationally around the first axis, and at least a part of the sidewall is the deformable member 222. That is, the sidewalls of the air cavity 223 may be entirely provided as the deformable member 222, and the sidewalls of the air cavity 223 may also be partially provided as the deformable member 222.

As shown in fig. 11 and 12, the side walls are clearance-fitted with the fitting holes 103 when the deformable member 222 is undeformed. That is, when the deformable member 222 is not deformed, the deformable member 222 is not in contact with the connection portion 110, and the first electrode 21 and the second electrode 22 are not electrically connected. When the battery 1000 is in an abnormal state, such as an overcharged state, the air pressure in the air cavity 223 increases, and the air pressure can drive the deformable member 222 to be electrically connected with the connecting portion 110, so that the first electrode 21 and the second electrode 22 are electrically connected to perform short-circuit protection on the battery 1000.

In some embodiments of the present invention, as shown in fig. 11 and 12, the battery cap plate 100 may further include: and the protective cover 90 is connected with the cover plate main body 10 and covers the outer side of the deformable member 222. It can be understood that, by providing the protective cover 90, the protective cover 90 can shield and protect the deformable member 222 and the air cavity 223, so as to prevent the deformable member 222 from being damaged by impact and affecting the normal operation of the battery 1000, thereby improving the stability and reliability of the operation of the battery 1000.

According to some embodiments of the present invention, as shown in fig. 11 and 12, the shield 90 may be provided with a gas hole communicating with the outside gas. It should be noted that, when the battery 1000 is in an abnormal state, such as an overcharged state, the air pressure in the air cavity 223 increases and drives the deformable member 222 to expand outwards, thereby causing the air pressure in the space between the outer walls of the protection cover 90 and the air cavity 223 to increase, and through the air hole communicated with the external air arranged in the protection cover 90, the air in the space between the outer walls of the protection cover 90 and the air cavity 223 can be discharged from the air hole, thereby avoiding the deformation of the deformable member 222 due to the influence of the increase of the air pressure in the space between the outer walls of the protection cover 90 and the air cavity 223, and further improving the smoothness and reliability of the movement of the deformable member 222.

According to some embodiments of the present invention, as shown in fig. 1-4, the deformable member 222 may be located radially outward of the second electrode 22, the deformable member 222 cooperating with the second electrode 22 to define an air cavity 223. The deformable member 222 is disposed at the position of the second electrode 22, so that the layout of the battery cover plate 100 can be made compact and reasonable, thereby saving space of the battery cover plate 100.

In some embodiments of the present invention, the air cavity 223 may be formed as one extending in the circumferential direction of the second electrode 22. As shown in fig. 1-4, the deformable member 222 may be electrically connected to the second electrode 22, and the deformable member 222 extends in a circumferential direction of the second electrode 22 to form an annular air cavity 223 disposed around the second electrode 22. Therefore, when the battery 1000 is short-circuited, the gas inside the battery 1000 enters the gas cavity 223, the gas entering the gas cavity 223 can push the deformable member 222 to deform towards the cover plate main body 10, and a circumferentially extending annular surface contact is formed between the deformable member 222 and the cover plate main body 10. Therefore, the contact area between the deformable piece 222 and the cover plate main body 10 can be increased, the situation that the area of the contact part between the deformable piece 222 and the cover plate main body 10 is too small and the deformable piece 222 and the cover plate main body 10 are fused due to too large current is avoided, and the reliability and the stability of connection between the deformable piece 222 and the cover plate main body 10 are improved.

In some embodiments of the present invention, the air cavity 223 may be plural, and the plural air cavities 223 may be arranged at intervals in the circumferential direction of the second electrode 22. Therefore, by arranging the air cavities 223, the abnormal state protection function of the battery 1000 can be prevented from being influenced by the deformation fault of the deformable member 222 of one or more air cavities 223, and the safety of the battery 1000 under the abnormal condition is improved.

In some embodiments of the present invention, as shown in fig. 1 and 2 in combination, the gas in the gas chamber 223 drives the deformable member 222 to deform in a radial direction of the second electrode 22 toward a direction close to the cap body 10, so that the deformable member 222 is in contact with the cap body 10.

It is noted that, as shown in fig. 1 and 2, the deformable member 222 may be configured in a ring shape protruding toward the second electrode 22 in a radial direction. When the battery 1000 is in an abnormal state, such as an overcharged state, the gas in the battery 1000 enters the gas cavity 223 through the gas passage S10, and the gas in the gas cavity 223 pushes the deformable member 222 outward in the radial direction, so that the deformable member 222 is deformed toward the connection part 110, and the deformable member 222 is brought into contact with the cap body 10 to achieve electrical connection between the first electrode 21 and the second electrode 22. When the battery 1000 is short-circuited, the battery 1000 releases energy and disconnects charging of the battery 1000.

According to some embodiments of the present invention, as shown in fig. 1 and 2, the second electrode 22 is provided with a gas passage S10 for communicating the gas chamber 223 with the inside of the battery 1000, and when the pressure in the battery 1000 increases, the gas inside the battery 1000 can enter the gas chamber 223 through the gas passage S10. As shown in fig. 1 and 2, the second electrode 22 may have a plurality of air outlet ports a1 communicating with the air cavity 223. Thus, the gas in the gas passage S10 can enter the gas cavity 223 through the plurality of gas outlets a 1. This can improve the gas flow efficiency. Moreover, the gas enters the gas cavity 223 from the plurality of gas outlets A1, which is beneficial to improving the uniformity and consistency of the pressure of the gas in the gas cavity 223 pushing the deformable part 222, and makes the deformation of each position of the short circuit more balanced.

According to some embodiments of the invention, as shown in fig. 1 and 2, the gas passage S10 may include: a first ventilation section S11 and a second ventilation section S12, the first ventilation section S11 extending in the axial direction of the second electrode 22, the second ventilation section S12 communicating with the first ventilation section S11, the second ventilation section S12 extending in the radial direction of the second electrode 22.

As shown in fig. 1, 2 and 6, the lower end of the first venting section S11 may communicate with the inside of the battery 1000, and the upper end of the first venting section S11 communicates with the second venting section S12. After being pressed, the gas in the battery 1000 can flow into the second ventilation section S12 through the first ventilation section S11 and enter the gas cavity 223 through the second ventilation section S12, and the gas channel S10 has a simple structure and is convenient and smooth in gas flowing.

In some embodiments of the present invention, as shown in fig. 1 and 2, the centerline of the first ventilation segment S11 coincides with the axis of the second electrode 22. Thereby, it is advantageous to improve the structural strength of the second electrode 22, and the plurality of gas outlets a1 may be equally spaced from the first ventilation section S11, thereby facilitating the uniformity and stability of the gas flow entering the gas cavity 223 from the gas channel S10.

In some embodiments of the present invention, as shown in fig. 1 and 2, an outer circumferential wall of the second electrode 22 opposite to the deformable member 222 is partially recessed inward in a radial direction to form a recess 2200, upper and lower ends of the deformable member 222 are respectively connected to the second electrode 22, and the deformable member 222 and the recess 2200 together define the air-along-cavity 223. For example, the deformable member 222 may be sleeved on the second electrode 22, and the upper and lower ends of the deformable member 222 are respectively connected to the second electrode 22, and an air cavity 223 is defined between the deformable member 222 and the inner wall of the recess 2200. It is understood that by providing the recess 2200, the overall size of the second electrode 22 may be reduced, and thus the structure of the battery cover plate 100 may be more compact and reasonable.

According to some embodiments of the present invention, as shown in fig. 1 and 2, the longitudinal section of the deformable member 222 is formed in an arc shape convex toward the second electrode 22. It should be noted that the "longitudinal section of the deformable member 222" described herein may be understood as a section of the deformable member 222 in the up-down direction shown in fig. 1. By providing the deformable member 222 with an arc-shaped longitudinal section that is convex toward the second electrode 22, the overall structure of the second electrode 22 can be made more compact and reasonable. Moreover, when the battery 1000 is in an abnormal state, such as an overcharged state, the gas entering the gas cavity 223 through the gas passage S10 may press the deformable member 222, so that the deformable member 222 expands outward in the direction to contact the cap main body 10, which is simple in structure and reliable in operation.

In some embodiments of the present invention, as shown in fig. 1 and 2, the battery cover plate 10 may be provided with a sink, a bottom wall of the sink is provided with a through hole, and the second electrode 22 is disposed through the sink and the through hole. Therefore, the battery cover plate 10 can be formed with a stepped structure, and the second electrode 22 can be set on the battery cover plate 10 in a sunken manner, so that the battery 1000 can be made compact and the space utilization rate of the battery 1000 can be improved.

According to some embodiments of the present invention, as shown in fig. 1, 2, and 4, the battery cap plate 100 may further include a first insulating member 31 and a connection part 110. The second electrode 22 and the battery cover plate 100 can be in insulated fit with each other through the first insulating member 31.

As shown in fig. 1, 2 and 4, the connection part 110 may include: a first extension 111, a second extension 112 and a third extension 113. The first extension segment 111 is electrically connected with the rest of the cover plate main body 10, an included angle is formed between the second extension segment 112 and the first extension segment 111, the third extension segment 113 is parallel to the first extension segment 111, the first extension segment 111 and the third extension segment 113 are respectively connected with two ends of the second extension segment 112, the third extension segment 113 extends towards the deformable piece 222, and the deformable piece 222 can be deformed to be in contact with the third extension segment 113.

As shown in fig. 1 and 4, the third extending segment 113 is provided with a receiving groove 1130, and the first insulating member 31 is disposed in the receiving groove 1130. It can be understood that the fixing assembly of the first insulating member 31 is facilitated by providing the receiving groove 1130 on the third extension 113, and moreover, the fixing firmness and reliability of the first insulating member 31 can be improved.

As shown in fig. 3 and 4, when the first insulating member 31 is fitted into the receiving groove 1130, the first insulating member 31 is located between the second electrode 22 and the cap body 10 to isolate the second electrode 22 from the cap body 10, thereby achieving an insulating fit between the second electrode 22 and the cap body 10.

In some embodiments of the present invention, as shown in fig. 1, 2 and 4, the battery cap plate 100 may further include a second insulating member 32, the second electrode 22 is provided with a support portion 221 extending in the circumferential direction, and the second insulating member 32 is located between the third extension 113 and the support portion 221. By providing the support portion 221 on the second electrode 22, the firmness and reliability of the fit between the second electrode 22 and the cap main body 10 can be improved. By providing the second insulating member 32 between the third extension 113 and the support 221, an insulating fit between the second electrode 22 and the cap body 10 may be achieved.

According to some embodiments of the invention, at least one of the deformable member 222 and the cover body 10 is provided with a coating. That is, the deformable member 222 may be provided with a coating layer, the cover main body 10 may be provided with a coating layer, or both the deformable member 222 and the cover main body 10 may be provided with a coating layer.

It should be noted that, when battery 1000 is in an abnormal state, such as an overcharged state, deformable member 222 deforms toward connection portion 110 and contacts connection portion 110, as shown in fig. 1 and 2. The coating can be provided at the matching surface of the deformable piece 222 and the connecting part 110, and the coating can also be provided at the matching surface of the connecting part 110 and the deformable piece 222; a coating may also be provided on the mating surfaces of both the deformable member 222 and the connecting portion 110. The coating may be a resistive coating (e.g., plastic, ceramic, etc.) having a resistance value. Thus, when deformable member 222 is in contact with connecting portion 110, a short circuit current passes through the resistive coating, releasing some of the energy and dissolving the coating, while battery 1000 is being de-charged.

The resistance of the coating is 1 milliohm-3 milliohm. Experiments prove that the resistance of the coating is set to be 1 milliohm-3 milliohm, and when the battery 1000 is in an abnormal state, such as an overcharged state, and the deformable member 222 is in contact with the connection part 110, the short-circuit current can conveniently dissolve the coating to release energy, and the first electrode 21 and the second electrode 22 are stably and reliably electrically connected, so that the safety of the battery 1000 in the abnormal state is greatly improved.

In some embodiments of the present invention, the second electrode 22 and the deformable member 222 are both made of copper, and the second electrode 22 and the deformable member 222 are welded together. Thus, the firmness and reliability of the connection between the deformable member 222 and the second electrode 22 may be improved. As shown in fig. 1 and 2, the second electrode 22 of the second electrode 22 may include an upper pole 2201 and a lower pole 2202. The lower pole 2202 is electrically connected with the battery cell 40, and the upper pole 2201 can be electrically connected with other external components to achieve electrical connection between the battery 1000 and other components. The upper end of the deformable piece 222 is welded to the upper pole 2201, and the lower end of the deformable piece 222 is welded to the lower pole 2202.

According to some embodiments of the present invention, as shown in fig. 1 and 2, the second electrode 22 may include: the pole comprises an upper pole 2201 and a lower pole 2202, wherein one of the upper pole 2201 and the lower pole 2202 is provided with a boss 2203, and the other one is provided with a groove 2204 matched with the boss 2203. Thus, a secure and reliable assembly between the upper pole 2201 and the lower pole 2202 can be achieved through the fit of the boss 2203 and the groove 2204, thereby facilitating the fixed assembly of the second electrode 22.

As shown in fig. 1 and 2, an upwardly protruding cylindrical boss 2203 may be disposed at the upper end of the lower pole 2202, and an upwardly extending cylindrical recess 2204 may be disposed at the lower end of the upper pole 2201, so that the upper pole 2201 and the lower pole 2202 may be efficiently and reliably assembled by inserting the boss 2203 into the recess 2204. Of course, the boss 2203 may be disposed on the upper pole 2201, the groove 2204 may be disposed on the lower pole 2202, and the boss 2203 and the groove 2204 may be matched to achieve efficient and reliable assembly of the upper pole 2201 and the lower pole 2202.

In some embodiments of the present invention, the first electrode 21 is coupled to the cap body 10 in an insulated manner, the second electrode 22 is coupled to the cap body 10 in an insulated manner, and the first electrode 21 is electrically connected to the connection portion 110 through a tab. The phrase "the first electrode 21 is in insulating engagement with the cap body 10" as used herein means that the first electrode 21 is in insulating engagement with the cap body 10 at the connection position, or the first electrode 21 is in insulating engagement with the other portion of the cap body 10 excluding the connection portion 110. For example, the entire cap body 10 may be a conductive member, and the connection portion of the first electrode 21 and the cap body 10 may be insulated and fitted by an insulating member, or another portion of the cap body 10 excluding the connection portion 110 may be provided as an insulating member, and the first electrode 21 is connected to another portion of the cap body 10 excluding the connection portion 110. The first electrode 21 is electrically connected to the connection portion 110 through a tab. When the battery 1000 is in an abnormal state, such as an overcharged state, the air pressure in the air cavity 223 increases to drive the deformable member 222 to contact the connection part 110, thereby realizing the short-circuit connection protection of the first electrode 21 and the second electrode 22.

According to some embodiments of the present invention, the first electrode 21 is electrically connected to the cap body 10, and the second electrode 22 is in insulative engagement with the cap body 10. For example, the connection point of the first electrode 21 and the cap main body 10 may be electrically connected to achieve the electrical connection of the first electrode 21 and the connection portion 110. Thereby, diversification of the design of the battery cover plate 100 is improved.

According to the battery 1000 of the embodiment of the present invention, as shown in fig. 6 and 7, the battery 1000 includes: the battery cover plate 100 is the battery cover plate 100 described above, the cover plate main body 10 is connected with the casing 80 to define a closed cavity, and the battery core 40 is arranged in the cavity.

According to the battery 1000 of the embodiment of the invention, by arranging the air cavity 223 communicated with the air inside the battery 1000, when the battery 1000 is in an abnormal state, such as an overcharged state, the air inside the battery 1000 can enter the air cavity 223, and the air entering the air cavity 223 can generate an acting force for pushing the deformable member 222, so that the deformable member 222 is deformed and is electrically connected with the connecting part 110, and the short-circuit connection of the first electrode 21 and the second electrode 22 of the battery 1000 is realized, so that the battery 1000 releases energy and disconnects the charging of the battery 1000. Through the arrangement, the battery 1000 has good safety in an abnormal state, and the overall structure of the battery cover plate 100 is compact and reasonable.

According to some embodiments of the present invention, as shown in fig. 6, the battery cell 40 may include a first tab 410 and a second tab 420, where the first tab 410 is connected to the first electrode 21 through a first lead tab 51, and the second tab 420 is connected to the second electrode 22 through a second lead tab 52. It can be appreciated that the fixed connection between the first tab 410 and the first electrode 21 and between the second tab 420 and the second electrode 22 is facilitated by the provision of the first tab 51 and the second tab 52.

As shown in fig. 13, according to a vehicle 1111 of the embodiment of the present invention, the vehicle 1111 includes the battery 1000 described above. For example, the vehicle may be an automobile, a truck, a rail vehicle, or the like.

According to the vehicle 1111 of the embodiment of the present invention, by providing the battery 1000 as described above, when the battery 1000 of the vehicle 1111 is in an abnormal state, such as an overcharged state, the first electrode 21 and the second electrode 22 of the battery 1000 may be protected from short-circuit connection, thereby improving the safety of charging the battery 1000 of the vehicle 1111, and thus improving the safety performance of the vehicle 1111.

A battery 1000 according to an embodiment of the present invention is described in detail in two specific embodiments with reference to fig. 1 to 12. It is to be understood that the following description is illustrative only and is not intended to be in any way limiting.

The first embodiment is as follows:

as shown in fig. 6 to 8, the battery 1000 includes: battery cover plate 100, casing 80, and battery core 40.

As shown in fig. 6 and 7, the cover plate body 10 is connected to the casing 80 to define a closed chamber, and the battery cell 40 is disposed in the chamber. The battery cap plate 100 includes: the cover plate comprises a cover plate main body 10, a liquid injection hole sealing nail 60, an explosion-proof valve 70, a first electrode 21, a second electrode 22, a first insulating piece 31 and a second insulating piece 32. The liquid injection hole sealing nail 60 and the explosion-proof valve 70 are both connected with the cover plate main body 10 in a welding way. The first electrode 21 and the second electrode 22 are respectively disposed on the cap main body 10, the first electrode 21 is a positive electrode, and the second electrode 22 is a negative electrode. The first electrode 21 is electrically connected to the cap main body 10, and the second electrode 22 is in insulative engagement with the cap main body 10.

As shown in fig. 6, the battery cell 40 includes a first tab 410 and a second tab 420, the first tab 410 is connected to the first electrode 21 through a first tab 51, and the second tab 420 is connected to the second electrode 22 through a second tab 52.

As shown in fig. 1 and 2, the cap body 10 has a connection portion 110, the connection portion 110 being disposed adjacent to the second electrode 22, the connection portion 110 being configured in a ring shape extending in a circumferential direction of the deformable member 222. The connection portion 110 includes: the cover plate comprises a first extension section 111, a second extension section 112 and a third extension section 113, wherein the first extension section 111 is electrically connected with the rest part of the cover plate main body 10, an included angle is formed between the second extension section 112 and the first extension section 111, the third extension section 113 is parallel to the first extension section 111, the first extension section 111 and the third extension section 113 are respectively connected with two ends of the second extension section 112, an accommodating groove 1130 is arranged on the third extension section 113, and the first insulating part 31 is arranged in the accommodating groove 1130. The first insulating member 31 may be interference-fitted into the receiving groove 1130, and the first insulating member 31 may also be bonded into the receiving groove 1130.

As shown in fig. 1 and 2, the second electrode 220 and the deformable member 222 are both made of copper or copper alloy, and the second electrode 22 and the deformable member 222 are connected by welding. An aluminum cap 224 is welded to the free end of the second electrode 22 to facilitate connection between the battery 1000 and other batteries or other components.

As shown in fig. 1 and 2, the outer peripheral wall of the second electrode 22 opposite to the deformable member 222 is partially recessed inward in the radial direction to form a recess 2200. The deformable piece 222 extends along the circumferential direction of the second electrode 22, the second electrode 22 comprises an upper pole 2201 and a lower pole 2202, the lower end face of the upper pole 2201 is provided with a groove 2204 extending upwards, the upper end face of the lower pole 2202 is provided with a boss 2203 extending upwards, and the upper pole 2201 and the lower pole 2202 are fixedly assembled through the matching of the boss 2203 and the groove 2204.

The upper end of the deformable piece 222 is welded with the upper pole 2201, and the lower end of the deformable piece 222 is welded with the lower pole 2202. The deformable member 222 defines an enclosed air cavity 223 with the inner wall of the recess 2200. The force-bearing area of the deformable member 222 is the arc-shaped inner surface area of the deformable member 222, and the force-bearing area is large, so that the deformable member 222 is driven to deform by the gas in the gas cavity 223. The lower pole 2202 is provided with a circumferentially extending support portion 221 at a position below the recessed portion 2200, the second insulating member 32 is located between the third extending section 113 and the support portion 221, and the second insulating member 32 is a ceramic ring. The ceramic ring is connected with the third extending section 113 and the supporting part 221 by brazing.

When the battery cap plate 100 is assembled, the deformable member 222 and the second electrode 22, the ceramic ring and the third extension 113 and the support 221 may be brazed at the same time. Alternatively, the deformable member 222 and the second electrode 22 may be brazed, and then the ceramic ring may be brazed between the third extension 113 and the support portion 221.

As shown in fig. 1 and 2, the second electrode 22 has a gas passage S10 communicating the gas cavity 223 with the interior of the battery 1000, the gas in the battery 1000 is pressurized and adapted to enter the gas cavity 223 from the gas passage S10, and the gas in the gas cavity 223 drives the deformable member 222 to expand outward in the radial direction of the second electrode 22, so that the deformable member 222 is in contact with the connecting portion 110 to realize the electrical connection between the first electrode 21 and the second electrode 22. At least one of the deformable member 222 and the connecting portion 110 is provided with a resistive coating (e.g., plastic, ceramic, etc.).

As shown in fig. 1 and 2, the gas passage S10 includes: a first vent segment S11 and a second vent segment S12, the first vent segment S11 extending axially of the second electrode 22, and a centerline of the first vent segment S11 coinciding with an axis of the second electrode 22. The second venting section S12 communicates with the first venting section S11, the second venting section S12 extends in the radial direction of the second electrode 22, and the second venting section S12 has two gas outlets a1 communicating with the gas chamber 223.

In order to facilitate the assembly of the battery 1000 in a group, the first electrode 21 and the second electrode 22 of the battery 1000 are located on the same plane in the height direction. As shown in fig. 6, the second electrode 22 sinks toward the inner side of the cap body 10, the portion of the second electrode 22 higher than the cap body 10 is as high as the first electrode 21, and the battery cell 20 has a stepped structure. Therefore, the space utilization rate of the battery 1000 and the volume of the battery cell 40 are improved by improving the volume of the battery cell 40.

When the battery 1000 is in an abnormal state, such as an overcharged state, the internal gas pressure of the battery 1000 increases, the gas enters the gas cavity 223 through the gas passage S10, and when the gas pressure reaches a predetermined pressure, the deformable member 222 expands outward under the gas pressure and contacts the connection portion 110, so that the entire battery 1000 forms an external short circuit loop. The contact position of the deformable piece 222 and the connecting part 110 has a certain resistance value to be coated, the short circuit current melts the resistance coating and releases partial energy, the short circuit external loop becomes a pure metal loop, the resistance value is far lower than that of the battery 1000 loop, the battery 1000 cannot be continuously charged, and the safety of the charging process of the battery 1000 is ensured.

Therefore, by arranging the air cavity 223 communicated with the air inside the battery 1000, when the battery 1000 is in an abnormal state, such as an overcharged state, the air inside the battery 1000 can enter the air cavity 223, and the air entering the air cavity 223 can generate an acting force for pushing the deformable member 222, so that the deformable member 222 deforms along the radial direction of the second electrode 22, so that the deformable member 222 is electrically connected with the cover plate main body 10 or the contact connection part 110 of the second electrode 22, the short-circuit connection of the first electrode 21 and the second electrode 22 of the battery 1000 is realized, and the battery 1000 releases energy and disconnects the charging of the battery 1000. Through the arrangement, the battery 1000 has good safety in an abnormal state, and the overall structure of the battery cover plate 100 is compact and reasonable.

Example two:

as shown in fig. 9 to 12, unlike the first embodiment, in this embodiment, the battery cover plate 100 further includes: the shield 90, the cover main body 10 is provided with an assembly hole 103, the assembly hole 103 is located between the first electrode 21 and the second electrode 22, and the air chamber 223 is provided in the assembly hole 103. As shown in fig. 11 and 12, the shield 90 is connected to the cover main body 10 and covers the outside of the deformable member 222, and the shield 90 is provided with a gas hole communicating with the outside gas.

As shown in fig. 11 and 12, the air chamber 223 has a first axis extending in the up-down direction, and the air chamber 223 includes a sidewall formed to extend rotationally around the first axis, the sidewall being the deformable member 222. The side walls are clearance fit with the fitting holes 103 when the deformable member 222 is undeformed. That is, when the deformable member 222 is not deformed, the deformable member 222 is not in contact with the connection portion 110, and the first electrode 21 and the second electrode 22 are not electrically connected. When the battery 1000 is in an abnormal state, such as an overcharged state, the air pressure in the air cavity 223 increases, and the air pressure can drive the deformable member 222 to be electrically connected with the connecting portion 110, so that the first electrode 21 and the second electrode 22 are electrically connected to perform short-circuit protection on the battery 1000.

Thus, by disposing the air cavity 223 between the first electrode 21 and the second electrode 22, the layout design of the air cavity 223 is facilitated. Through setting up protection casing 90, protection casing 90 can play the effect of sheltering from the protection to deformable member 222 and air cavity 223, avoids deformable member 222 to be damaged by the striking and influence the normal operating of battery 1000, has improved the stability and the reliability of battery 1000 operation.

Moreover, the air holes communicated with the outside air are formed in the protective cover 90, so that the air in the space between the protective cover 90 and the outer wall of the air cavity 223 can be discharged from the air holes, the deformation of the deformable part 222 caused by the influence of the increase of the air pressure in the space between the protective cover 90 and the outer wall of the air cavity 223 is avoided, and the smoothness and the reliability of the movement of the deformable part 222 are improved.

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 invention. 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.

While embodiments of the 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

1. A battery cover plate, comprising:

a cover main body having a connection part;

the first electrode and the second electrode are respectively arranged on the cover plate main body, and the first electrode is electrically connected with the connecting part; and

the gas cavity is communicated with gas inside the battery and comprises side walls arranged in the vertical direction, at least part of the side walls are deformable parts, the deformable parts are electrically connected with the second electrode, and the gas in the gas cavity drives the deformable parts to deform when the pressure is increased so as to enable the deformable parts to be electrically connected with the connecting part and realize the electrical connection between the first electrode and the second electrode.

2. The battery cover plate according to claim 1, wherein the cover plate body is provided with a fitting hole between the first electrode and the second electrode, the air cavity is provided in the fitting hole, the air cavity has a first axis extending in an up-down direction, the air cavity includes a sidewall formed by rotationally extending around the first axis, at least a portion of the sidewall is the deformable member, and the sidewall is in clearance fit with the fitting hole when the deformable member is undeformed.

3. The battery cover plate according to claim 2, further comprising: the protection casing, the protection casing with the apron main part is connected and the cover is located the outside of deformable spare.

4. The battery cover plate according to claim 3, wherein the shield is provided with a gas hole communicating with the outside gas.

5. The battery cover plate of claim 1, wherein the deformable member is located radially outward of the second electrode, the deformable member cooperating with the second electrode to define the air cavity.

6. The battery cover plate according to claim 5, wherein the air cavity is formed as one extending in a circumferential direction of the second electrode; or the air cavities are multiple and are arranged at intervals along the circumferential direction of the second electrode.

7. The battery cover plate according to claim 5, wherein the second electrode is provided with a gas passage for communicating the gas chamber with the inside of the battery.

8. The battery cover plate according to claim 7, wherein the gas channel comprises:

a first vent segment extending axially of the second electrode;

a second vent segment in communication with the first vent segment, the second vent segment extending in a radial direction of the second electrode.

9. The battery cover plate of claim 8, wherein a centerline of the first vent segment coincides with an axis of the second electrode.

10. The battery cover plate according to claim 5, wherein a peripheral wall of the second electrode opposite to the deformable member is partially recessed inward in a radial direction to form a recess, upper and lower ends of the deformable member are connected to the second electrode, respectively, and the deformable member and the recess define the air cavity along therewith.

11. The battery cap plate according to claim 5, wherein the longitudinal section of the deformable member is formed in an arc shape that is convex toward the second electrode.

12. The battery cover plate according to claim 5, wherein the battery cover plate is provided with a sinking groove, the bottom wall of the sinking groove is provided with a through hole, and the second electrode is arranged in the sinking groove and the through hole in a penetrating manner.

13. The battery cap plate according to claim 5, further comprising a first insulating member, the connection part comprising:

a first extension electrically connected with the rest of the cap plate body;

the second extension section and the first extension section form an included angle;

the third extension section is parallel to the first extension section, the first extension section and the third extension section are respectively connected with two ends of the second extension section, the deformable piece deforms and contacts with the third extension section, an accommodating groove is formed in the third extension section, and the first insulating piece is arranged in the accommodating groove.

14. The battery cover plate of claim 13, further comprising a second insulator, the second electrode being provided with a circumferentially extending support, the second insulator being located between the third extension and the support.

15. The battery cover plate according to claim 1, wherein at least one of the second electrode and the cover plate main body is provided with a coating layer having a resistance of 1 milliohm-3 milliohm.

16. The battery cover plate according to claim 1, wherein the second electrode comprises: go up utmost point post and utmost point post down, go up utmost point post with one of utmost point post is equipped with the boss down, another be equipped with the recess of boss looks adaptation.

17. The battery cover plate according to claim 1, wherein the first electrode is in insulative engagement with the cover plate main body, the second electrode is in insulative engagement with the cover plate main body, and the first electrode is electrically connected to the connection portion through a tab.

18. The battery cover plate of claim 1, wherein the first electrode is electrically connected to the cover plate body and the second electrode is in insulative engagement with the cover plate body.

19. A battery, comprising:

a housing;

a battery cover plate according to any one of claims 1-18, the cover plate body being connected to the housing to define an enclosed chamber;

the battery cell is arranged in the cavity.

20. A vehicle, characterized by comprising: a battery according to claim 19.