WO2019120272A1

WO2019120272A1 - Battery cover plate assembly, single battery, battery module, power battery and electric vehicle

Info

Publication number: WO2019120272A1
Application number: PCT/CN2018/122545
Authority: WO
Inventors: 蒋露霞; 胡世超; 鲁鹏; 王信月
Original assignee: 比亚迪股份有限公司
Priority date: 2017-12-22
Filing date: 2018-12-21
Publication date: 2019-06-27
Also published as: CN207818641U

Abstract

Disclosed are a battery cover plate assembly, a single battery, a battery module, a power battery, and an electric vehicle. The battery cover plate assembly comprises a cover plate (110), an inner lead-out member (109) and an outer electrode terminal (112), wherein a current interruption device comprises a nicked member (101) and a flip member (102), and the inner lead-out member (109) is mounted on the cover plate (110) via a cover plate insulation member (122); and the cover plate insulation member (122) has a second clamping portion (126), and the second clamping portion (126) comprises: a first inverted cone projection; or a first inverted cone groove; or a first inverted cone projection and a first inverted cone groove.

Description

Battery cover assembly, single battery, battery module, power battery and electric vehicle

Cross-reference to related applications

The present disclosure is based on a Chinese patent application filed on Jan. 22, 2017, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present disclosure relates to the field of batteries, and relates to a battery cover assembly, a battery using the battery cover assembly, a battery module using the battery, a power battery using the battery module, and a vehicle using the battery .

Background technique

As an energy storage unit, the battery plays an important role in various industries. For example, the power battery is widely used in new energy vehicles and the like. The battery pack of the power battery may have a battery module formed by connecting a plurality of single cells in series or in parallel. Realize the work of charging and discharging. Among them, during the charging and discharging process of the power battery, the voltage and current changes are usually monitored by the BMS (Battery Management System) and the state of charge is calculated. If there is a problem with the voltage sampling, it may cause the battery to overcharge. Especially for the ternary system, if the overcharge reaches a certain level, there is a danger of the battery burning and exploding.

In the related art, the voltage and current of the battery are monitored first, and then the battery power is calculated by the current integration method and the open circuit voltage method, thereby controlling the charging and discharging process of the battery. However, there are also deficiencies, such as battery voltage sampling or current sampling failure, or software failure, resulting in long-term battery charging is not controlled, especially in the case of charging pile charging, charging pile and battery manager communication failure, overcharge Uncontrollable, if the battery is overcharged to a certain extent, it will cause the battery to rise or even explode.

Therefore, it is of positive significance to provide a current interruption technique capable of forcibly turning off the charge and discharge circuit itself.

Summary of the invention

An object of the present disclosure is to provide a battery cover assembly, a battery using the battery cover assembly, a battery module using the battery, a power battery using the battery module, and a vehicle using the power battery.

The present disclosure also proposes a single battery having the above battery cover assembly.

The present disclosure also proposes a battery module having the above single battery.

The present disclosure also proposes a power battery having the above battery module.

The present disclosure also proposes an electric vehicle having the above power battery.

A battery cover assembly according to a first aspect of the present disclosure includes a cover plate, an inner lead-out member located inside the cover plate, and an electrode outer terminal located outside the cover plate, the inner lead-out member and the outer electrode terminal being interrupted by a current The device is electrically connected, the current interrupting device includes a scoring member and a flip member, the flip member is electrically connected to the electrode outer terminal, and the scoring member is electrically connected to the inner lead member, and the scoring member is Forming a score and electrically connecting with the inverting member, the flip member being capable of acting under air pressure to break the score, the inner lead member being mounted on the cover plate by a cover insulating member The cover insulating member has a second engaging portion that is engaged with the inner lead-out member;

The second engaging portion includes a first inverted tapered protrusion, and the inner leading member is correspondingly formed with a second inverted tapered groove that positively receives the first inverted tapered protrusion;

Or the second latching portion includes a first inverted tapered recess, and the inner lead-out member is correspondingly formed with a second inverted tapered projection that is positively fitted into the first inverted tapered recess;

Or the second latching portion includes a first inverted tapered protrusion and a first inverted tapered recess, and the inner lead-out member is correspondingly formed with a shape that positively accommodates the first inverted tapered protrusion A second inverted tapered recess and a second inverted tapered projection that is positively fitted into the first inverted tapered recess.

According to the battery cover assembly of the present disclosure, the snap-fit between the cover insulating member and the inner lead-out member is achieved by the shape fit of the inverted tapered projection and the inverted tapered recess, and the latching manner can make the cover insulating member The surface connection is realized with the inner lead-out member without protruding other structures, thereby saving space, and particularly facilitating the arrangement of the current interrupting device.

According to some embodiments of the present disclosure, the second engaging portion includes a plurality of first inverted tapered protrusions, and correspondingly, the inner leading member is provided with a plurality of second inverted tapered grooves.

According to some embodiments of the present disclosure, the second engaging portion includes a plurality of first inverted tapered grooves, and correspondingly, the inner leading member is provided with a plurality of second inverted tapered protrusions.

According to some embodiments of the present disclosure, the second snap portion includes a plurality of first inverted tapered protrusions extending parallel to each other and adjacent to the first inverted tapered protrusion Forming a first inverted tapered groove therebetween, correspondingly, the inner lead-out member is provided with a plurality of second inverted tapered grooves, and one of the adjacent second inverted tapered grooves is formed The second inverted tapered protrusion.

According to some embodiments of the present disclosure, the cover insulating member further includes a first snap portion that is engaged with the cover plate.

According to some embodiments of the present disclosure, the cover insulating member includes a substrate that is bonded to a lower surface of the cover plate, and the cover plate is formed with a mounting hole for mounting the current interrupting device, the first card The joint includes a first annular projection connected to an upper surface of the substrate, the first annular projection having an L-shaped cross section to fold outwardly after passing through the mounting hole to form a housing with the substrate The annular card slot of the hole wall of the mounting hole.

According to some embodiments of the present disclosure, the inner lead-out member is formed as a sheet-like structure having an intermediate weld zone electrically connected to the score member and an edge weld zone electrically connected to the battery core, the edge Forming, on the welding zone, the second inverted tapered groove that is engaged with the second engaging portion;

Or a second inverted tapered protrusion that is engaged with the second engaging portion is formed on the edge welding portion;

Or a second inverted tapered groove and a second inverted tapered protrusion that are engaged with the second engaging portion are formed on the edge welding portion.

According to some embodiments of the present disclosure, the thickness of the edge land is greater than or equal to the thickness of the intermediate land.

According to some embodiments of the present disclosure, the score member includes a scored region formed with a score, a first land for electrically connecting to the flip member, and a second for electrical connection with the inner lead member a weld zone formed as an elongated structure extending along a length direction of the cover plate, the score extending along a length direction of the elongated structure, and the first weld zone and the second The weld zone is disposed on both sides of the height direction of the scored zone and is respectively formed as an elongated structure extending along the length direction of the cover plate, and the intermediate weld zone is correspondingly formed into an elongated structure.

According to some embodiments of the present disclosure, the intermediate weld zone is formed with a receiving weld groove for receiving the second weld zone.

A unit cell according to a second aspect of the present disclosure, comprising a casing, a battery core housed in the casing, and a battery cover assembly enclosing the casing, wherein the battery cover assembly is a battery cover provided by the present disclosure A plate assembly electrically coupled to the battery core and the inverting member is in gaseous communication with an interior of the outer casing.

According to the battery module of the third aspect of the present disclosure, the battery unit provided by the present disclosure is provided in the battery module.

A power battery according to a fourth aspect of the present disclosure includes a package body and a battery module disposed in the package body, the battery module being the battery module provided by the present disclosure.

According to the electric vehicle of the fifth aspect of the present disclosure, the electric vehicle is provided with the power battery provided by the present disclosure.

Through the above technical solution, the inner lead-out member can be stably installed on the cover insulating member through the reverse tapered snap-fit structure, so that the force transmitted from the battery core to the inner lead-out member can be directly transmitted to the cover insulating during the use of the battery. The piece is then transmitted to the cover plate, which in turn reduces the effect of the core-core vibration process of the cell on the indented piece attached to the inner lead-out member, thereby avoiding accidental disconnection of the score.

Other features and advantages of the present disclosure will be described in detail in the detailed description which follows.

DRAWINGS

The accompanying drawings are intended to provide a further understanding of the disclosure In the drawing:

1 is a partially exploded perspective view of a battery module of the present disclosure;

2 is a partial perspective structural view of a flip member of a current interrupting device in an embodiment of the present disclosure;

3 is a top plan view of a flip member of a current interrupting device of an embodiment of the present disclosure;

4 is a schematic perspective structural view of a unit battery of a battery cover assembly of an embodiment of the present disclosure;

5 is a perspective view showing a first structure of a scoring member of a current interrupting device in an embodiment of the present disclosure;

6 is a perspective view showing a second structure of a scoring member of a current interrupting device in an embodiment of the present disclosure;

7 is a perspective view showing a third structure of a scoring member of a current interrupting device in an embodiment of the present disclosure;

Figure 8 is a cross-sectional view of a battery cover assembly based on the score member of Figure 5 in an embodiment of the present disclosure;

9 is a cross-sectional view of a battery cover assembly based on the score member of FIG. 7 in an embodiment of the present disclosure;

10 is a partial structural schematic view of an inner lead-out member in an embodiment of the present disclosure;

11 is a partial structural schematic view of another inner lead-out member in an embodiment of the present disclosure;

12 is a perspective structural view of a first type of cover insulating member in an embodiment of the present disclosure;

Figure 13 is a perspective view showing the perspective view of the cover insulating member of Figure 12;

14 is a schematic perspective structural view of a second cover insulating member in an embodiment of the present disclosure;

Figure 15 is a cross-sectional structural view taken along line A-A of Figure 14;

Figure 16 is a cross-sectional view of the cover insulating member of the battery cover assembly of Figure 8 replaced with a third type of cover insulating member in the present embodiment;

17 is a perspective structural view showing a fourth type of cover insulating member mounted to a cover plate in an embodiment of the present disclosure;

Figure 18 is a cross-sectional structural view showing the cover insulating member of Figure 17 mounted on the cover;

Figure 19 is a partial structural view of the cover plate of Figure 17;

20 is a schematic structural view of an electric vehicle according to the present disclosure.

Detailed ways

The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are not to be construed

In the present disclosure, the orientation words used, such as "up, down, left, and right," are generally defined on the basis of the direction of the drawing of the corresponding drawing, and "inside and outside" means Inside and outside of the contour of the corresponding part.

As shown in FIGS. 1 to 11, the present disclosure provides a battery cover assembly 100, a current interrupting device in the battery cover assembly 100, a flip member and a scoring member in the current interrupting device, and the use of the battery cover The unit cell 200 of the unit 100, the battery module 300 using the unit cell 200, the power battery 400 of the battery module 300, and the electric vehicle 500 using the power battery 400 are used. As shown in FIG. 1, a current interrupting device is disposed between the electrode outer terminal 112 and the internal cell for cutting off the circuit inside and outside the battery. Among them, in the unit cell 200, the plurality of unit cells 200 are connected to the battery module 300 in series or in parallel, and can be placed in the battery pack to form the power battery 400. In addition, in addition to the field of the power battery 400, various technical solutions provided in the present disclosure can be widely applied to other battery fields. In some embodiments, the present disclosure introduces the current interrupting device involved by two embodiments. The various embodiments will be described in detail below with reference to the drawings.

First, as shown in FIG. 1 and FIG. 4 , an embodiment of the present disclosure provides a battery module 300 including a plurality of unit batteries 200 , wherein the unit battery 200 may include a housing 111 and electricity contained in the housing. The core, and the cover plate 110 of the package housing, wherein the electrode outer terminal 112 is disposed on the cover plate for performing input and output of current through the various electrode lead-out members 119. As shown in FIG. 8, the battery cover assembly 100 further has an inner lead-out member 109 electrically connected to the battery core, and a current interrupting device is disposed between the outer electrode terminal 112 and the inner lead-out member 109 to control the current of the electrode terminal. Input and output. That is, the current interrupting device is in a state in which the battery cell is turned on in the normal state of the unit cell 200. At this time, the electrode terminal can normally perform current input and output to complete the charging and discharging operation of the unit cell 200, and in a dangerous state. For example, when the battery is overcharged, the current interruption device can interrupt the current input and current output of the electrode terminal, thereby avoiding problems such as overcharging of the battery. Therefore, as an important safety measure, the reliability of the current interrupt device is critical, that is, the current interrupt device is required to respond quickly.

In the present disclosure, the current interrupting devices in the various embodiments are all mechanical structures that sense air pressure. In some embodiments, the current interrupting devices are in gas communication with the interior of the outer casing of the unit cell 200 and are capable of breaking through the flow of air under pressure. Current. In some embodiments, the transfer of current can be interrupted by disconnecting the internal components to cut off the charge and discharge of the battery in time. The source of the air pressure utilized is: when, for example, the battery is in a dangerous state such as overcharging, gas is generated inside the battery, which causes the air pressure inside the outer casing to rise, or the battery temperature rises when the battery is abnormal during use causes the battery to rise. The internal air pressure rises, thereby generating the pneumatic power that drives the current interruption device.

Taking the embodiment as described in FIG. 8 as an example, the current interrupting device has a scoring member 101 and a flip member 102 connected to the scoring member 101 to be electrically connected to each other, and the flip member 102 and the scoring member 101 can Disconnect the electrical connection under pressure. In an embodiment of the present disclosure, the disconnection of the self structure may be achieved by disconnecting at least one of the two, for example, by processing a weak score on the corresponding component, thereby achieving disconnection of the electrical connection, some In the embodiment, a score 104 is formed on the score member 101. That is, under the action of the internal air pressure, the indentation 104 can be broken by the inversion operation of the inverting member 102 to achieve the disconnection of the electrical connection between the electrode outer terminal 112 and the inner lead-out member 109, thereby achieving the purpose of cutting off the current.

In this manner, it is considered that since the current to be passed is large in the field of, for example, the power battery 400, it is necessary to ensure that the welded structure of the score member 101 and the flip member 102 is stable, and the large current fuse welded structure is avoided. Thus, by the arrangement of the score 104 of the score member 101, that is, the weak portion having a smaller strength than the other regions is processed in the corresponding portion, the complete disconnection of the score member 101 and the flip member 102 can be completed.

In the embodiment of the present disclosure, as shown in FIG. 2 and FIG. 3, the inverting member 102 is formed into a tapered sheet-like structure, and the tapered small end is formed as a first connecting portion 115, and the big end is away from the notch. The piece 101 is formed as a second connection zone 116. The tapered structure can dispose the first connecting area 115 and the second connecting area 116 differently, and can provide a space for the flipping member 102 to be turned upside down to break the nick 104, thereby breaking the electrode outer terminal 112 and the inner portion. Electrical connections between the leads 109. In other possible embodiments, the flip member 102 may also be a flat member having elasticity or the like.

As shown in FIG. 8 and FIG. 9 , in the embodiment of the present disclosure, in order to ensure that the gas inside the battery can be actuated, a support ring 113 is sealedly connected between the lower side of the outer periphery of the flip member 102 and the cover 110, and the electrode is externally The outer periphery of the terminal 112 is electrically connected to the upper side of the outer periphery of the flip member 102, so that gas generated from the inside of the battery can act on the flip member 102 without leaking. In order to enable the flipper 102 to operate normally, the electrode outer terminal 112 is formed into a cap structure and may be formed with a through hole for discharging gas when the flipper 102 is actuated, thereby preventing the flipper from being impeded under the action of air pressure. In addition, in the two embodiments in which the cover plate 110 is charged and insulated, the support ring 113 may be supported by an insulating material or a conductive material. Generally, the support ring 113 can be a ceramic ring to insulate the cover plate 110 from being charged.

As shown in FIG. 2 and FIG. 3, the battery cover assembly 100 provided by the embodiment of the present disclosure includes a flip member 102 formed on the basis of the foregoing embodiment to extend along the length direction of the cover plate 110. Shape structure. Here, the elongated structure herein means that the dimension in the longitudinal direction of the cover plate is larger than the dimension in the other direction in the section parallel to the cover plate of the elongated structure. Therefore, as shown in FIG. 4, since the overturning member 102 is formed as an elongated structure extending along the cover plate, it is possible to reduce, for example, the current including the flip member 102 in FIG. 1 while securing the contact area with the internal gas. The interruption device exposes the portion of the cover plate 110 beyond the cover plate 110 in the height direction, and even as shown in FIG. 9, can be completely within the range of the cover plate, thereby avoiding interference with other devices other than the cover plate 110, and simultaneously flipping Sensitivity is guaranteed.

As shown in FIG. 2 to FIG. 4 , in the embodiment of the present disclosure, the end portion of the elongated structure in the longitudinal direction has a circular arc shape, that is, the cross section parallel to the cover plate has a middle rectangle and curved ends at both ends. The structure, i.e., the structure, has no corners, thereby facilitating the formation of the annular flip member and other corresponding structures, such as the score member 101, the support ring 113 and the electrode outer terminal 112, which are fitted thereto, while accommodating the structure of the cover plate 110. In other embodiments, the elongate structure may also be a waist or elliptical structure with the long axis of the waist or elliptical cross section being in the direction of the cover. In some embodiments, the parallel of the elongate structure and the cross section of the cover plate may also be formed into other shapes such as a rectangular cross section.

In the embodiment of the present disclosure, since the components connected to the flip member 102 outside the cover plate 110 are the electrode outer terminal 112 and the support ring 113, it is possible to design an elongated structure which is also matched, so that, for the component The connection between the at least the flip member 102 and the second connection region 116 connected to the electrode outer terminal 112 and the support ring 113 is formed into an elongated structure. The support ring 113 is connected to the cover plate 110, and can be designed to form an elongated structure that does not protrude from the edge of the cover plate 110, specifically the width edge of the cover plate 110, wherein the width edge and cover of the support ring 113 can be selected. The edges of the board 110 are aligned. In order to obtain a larger design and force space for the flip member 102.

In the present embodiment, as shown in FIG. 2, the first connection region 115 is also formed correspondingly to an elongated structure extending along the cover plate. The end of the elongated structure in the longitudinal direction is a circular arc shape, and the elongated structure may also be an elliptical or a waisted structure. The corresponding score member 101 can be formed into an elongated structure as shown in FIGS. 5 to 7.

Continuing to describe the inverting member 102 in the present embodiment, the inverting member 102 is formed into a tapered sheet-like structure in a direction perpendicular to the upper surface of the cap plate 110, and the first connecting portion 115 formed by the tapered small end is formed into an elongated shape. The structure has a large end away from the score member 101 and forms a second connection region 116 which is parallel to the first connection region 115 and formed into an elongated structure. In some embodiments, the second connection region 116 is a flanged structure to facilitate simultaneous connection with the support ring 113 and the electrode outer terminal 112.

In the present embodiment, in order to ensure the connection strength, the thicknesses of the first connection region 115 and the second connection region 116 are respectively greater than the thickness of the action region 123 between the two. In some embodiments, the first connection region and the second connection region may have a thickness of 0.3-3 mm, and the action region 123 may have a thickness of 0.05-0.3 mm. This design is equally applicable to the flipper 102 in other embodiments.

As shown in FIGS. 5-7, based on the battery cover assembly 100 provided by an embodiment of the present disclosure, the three indentations provided by the present disclosure are further described. Unlike the existing scoring member in which the scoring is formed into a ring structure, in the scoring member 101 provided in the present embodiment, the scoring 104 is an elongated scoring that is not closed loop. In some embodiments, in a vertical section of the score member 101 perpendicular to the length direction of the cover plate 110, the first land 103, the scored region 105, and the second land 107 are sequentially disposed in a strip shape, and the score 104 is The scored area 105 extends along the length direction of the cover plate 110. Thus, by breaking the score 104, it is also possible to break the electrical connection between the first land 103 and the second land 107, thereby interrupting the current. In addition, the arrangement in the vertical direction is strip-shaped, that is, the dimension of the score member in the height direction is larger than the dimension in the width direction, so that the dimension of the score member 101 in the width direction can be effectively saved, which is beneficial to the overall current. The interrupting device does not extend beyond the extent of the cover plate 110 in the width direction.

Further, in the present embodiment, the score region 105 is formed in an elongated structure extending in the longitudinal direction of the cover plate, that is, the dimension in the longitudinal direction of the score member is larger than the dimension in the width direction and the height direction. The score 104 extends along the length of the elongate structure to form a non-closed loop score. According to some embodiments of the present disclosure, the score 104 is a linear score, and in other possible embodiments, the score It can also be a long indentation such as a curve or a broken line. And in order to achieve the breaking of the notch 104, the first land 103 and the second land 107 are disposed on both sides in the height direction of the notch region 105. That is, in the orientation of the figure, the first land 103, the scored region 105, and the second land 107 are disposed in order from the top to the bottom in the height direction, thereby being lined up in the vertical section of the score member 101 perpendicular to the cover plate 110. Sexual distribution. This is in contrast to existing radial-shaped annular indentations. Thus, after the flip member 102 is reversed by force, the score 104 can also be broken, thereby achieving the purpose of interrupting the current between the electrode outer terminal 112 and the inner lead member 109.

As shown in FIGS. 5 and 6, in one embodiment, the first land 103, the scored region 105, and the second land 107 are sequentially formed in an I-shaped structure in the height direction, that is, the first land 103. Both sides of the second land 107 and the second land 107 protrude from the score region 105 and may form solder joints respectively soldered to other components. In this way, when welding with the flip member and the inner terminal of the motor, the welding is more stable, and the problem of accidental disconnection of the solder joint under the action of external force is avoided. The height direction of the score member 101 is relative to the length direction thereof, and after being assembled to the cover plate, the height direction thereof is the up-and-down direction with respect to the cover plate. In another embodiment, the first land 103, the scored region 105, and the second land 107 are sequentially formed in a zigzag structure in the height direction. That is, only one side of the first land 103 and the second land 107 protrudes from the notch region 105 and can form a one-sided pad, so that the corner of the zigzag structure can be buffered when an external force is received. The effect, thereby protecting the score 104 on the scored region 105 between the first weld zone 103 and the second weld zone 107, reduces the likelihood of the score 104 being accidentally broken.

In addition, in the present embodiment, the welding area of the score 104 and the first land 103 and the second land 107 is disposed on different planes in the height direction or the other direction, thereby To reduce the impact of heat such as laser welding on the score.

In order to accommodate such an elongated indented member 101, as shown in FIG. 2, the inverting member 102 is formed as an elongated structure extending along the cover plate, and is disposed parallel to the elongated structure of the incision member 101, wherein The flip member 102 has a first connection region 115 extending along the first land 103 and soldered to each other, the first connection region 115 being formed in an elongated structure and the lower surface being formed with a solder bath accommodating the first land 103. The soldering groove may be an n-shaped groove having an n-shaped cross section or an L-shaped groove having an L-shaped cross section.

In some embodiments, as shown in FIGS. 2 and 7, when the indentation member 101 is of the I-shaped structure, the welding groove is an n-shaped groove to be opposite to the two sides of the first bonding zone 103 accommodated in the welding groove. Edge welding, for example by brazed joint welding, makes the electrical connection stable.

In addition, as shown in FIG. 9, when the scoring member 101 has a zigzag structure, the soldering groove may also have an L-shaped structure to be welded to a side edge of the first bonding portion accommodated in the soldering groove away from the second bonding portion. For example, by brazed seam welding. This makes it possible to form a buffer for the scored area 105 by the corners of the zigzag structure when an external force is received.

In the present embodiment, regardless of the I-shaped or Z-shaped structure, or half of the half-word, the score 104 may be disposed in parallel with the first land 103 and the second land 107, respectively, so that the flip member When the 102 is turned over, the maximum vertical tearing force can be applied to each portion of the score 104 without generating a component force in the other direction, thereby providing the sensitivity of the current interrupting device.

In the present embodiment, as shown in Fig. 5 or Fig. 6, the end of the score 104 may penetrate to the edge of the scored area 105 or be spaced apart from the edge of the scored area 105. The edge which penetrates to the scored area 105 can improve the sensitivity of the current interrupting device, and the interval of the gap can ensure the score of the internal resistance of the indented member 101 when the internal pressure of the battery is fluctuated within a low range. There is no effect, only when the internal pressure value exceeds the predetermined value, the internal pressure of the battery can break the score 104.

As shown in Fig. 6, when there is a space between the end of the score 105 and the edge of the scored area 105, especially when the ends are spaced apart, the end of the score 104 and the edge of the scored area 105 can be designed. The interval is 0.01-1 mm, and further, the interval between the end of the score 104 and the edge of the scored region 105 is 0.05-0.5 mm. Thereby, the sensitivity of the current interrupting device can be ensured, and the scoring can be ensured to be disconnected from the external force or the internal air pressure fluctuation.

In both of the I-shaped and Z-shaped embodiments of the present embodiment, the thicknesses of the first land 103 and the second land 107 are respectively greater than or equal to the thickness of the score region 105. It should be noted here that since the formation of the notch region 105 is a plate-like structure, the thickness direction thereof is inconsistent with the thickness directions of the first and

second bonding regions

103 and 107, wherein the first bonding region 103 and the second bonding The thickness direction of the region 107 is in the up and down direction in the drawing, that is, welding with the side edges of the soldering groove, which can be understood as being perpendicular to the direction of the cover plate 110, and the thickness direction of the notch region 105 is parallel to the cover plate 110. The direction, that is, the width direction of the entire indented member, is formed on the side of the notch region 105 that extends up and down.

In some embodiments, the first weld zone 103 and the second weld zone 107 have a thickness of 0.4-5 mm and the score zone 105 has a thickness of 0.05-1 mm. Further, the first land 103 and the second land 107 have a thickness of 0.8 to 3 mm, and the notch 105 has a thickness of 0.1 to 0.8 mm. Therefore, by setting the thickness of the scored region 105 to be less than or equal to the thicknesses of the first land 103 and the second land 107, it is possible to ensure the welding strength of the welded region and provide a basis for high-quality scoring.

In addition, it is also possible to design the thickness of the first land 103 to be equal to or smaller than the thickness of the second land 107. Therefore, it is possible to avoid more occupation space of the flip member 102 while ensuring the welding strength, so that the flip member 102 can be designed to be thicker in the height direction as much as possible, so as to perform a large flipping action to break the score 104. Thereby, the electrical connection between the electrode outer terminal 112 and the inner lead-out member 109 is broken.

In the present embodiment, as shown in FIGS. 6 and 7, the score 104 may be a strip formed on one side of the score region 105, or as shown in FIG. 5, formed on both sides of the score region 105. Two. When the score 104 is two, the two scores are aligned on both sides of the score area 105 to enhance the sensitivity of the current interrupting device.

In the present embodiment, as shown in FIG. 8 and FIG. 9 , the inverting member 102 has a second connecting portion 116 formed in an elongated structure, and a supporting ring is sealedly connected between the lower side of the second connecting portion 116 and the cover plate 110 . 113. The outer periphery of the electrode outer terminal 112 is electrically connected to the upper side of the second connection region 116. Thus, the support ring can be formed as an elongate structure that extends along the cover plate, and further, as shown in Figure 9, the support ring can be designed to not extend beyond the width edge of the cover plate to avoid affecting other equipment outside the battery.

In order to accommodate the assembly of the elongated indented member 101, in the battery cover assembly 100 provided by the embodiment of the present disclosure, as shown in FIGS. 8, 10 and 11, the inner lead member 109 is formed into a sheet-like structure, the sheet-like structure There is an intermediate land 131 electrically connected to the score member 101 and an edge land 132 electrically connected to the cell, and the edge land 132 is located outside the intermediate land 131. Wherein, the thickness of the edge land 132 is greater than or equal to the thickness of the intermediate land 131. When the thickness of the intermediate land 131 is small, it can form a step structure with the edge land 132 and have a height difference, that is, as shown in FIG. 8, the two are not in the same plane in the vertical direction, so that the edge welding zone is performed. When the electrode 132 is welded to the battery tab or to other adapters between the cells, the scoring member 101 attached to the intermediate land 131 can be cushioned.

In some embodiments, to ensure structural strength and cushioning, the intermediate weld zone 131 has a thickness of 0.1-1 mm and the edge weld zone 132 has a thickness of 1-5 mm, in accordance with some embodiments of the present disclosure. Further, structurally, as shown in FIG. 10, the edge land 132 is formed as an annular joint region surrounding the intermediate land 131, wherein the figure is a cut-away partial view through which the intermediate land 131 can be passed. Surrounding, as shown in FIG. 11, the edge weld zone may also be a strip weld zone located on either side of the intermediate weld zone 131. That is, the intermediate weld zone 131 is not closed so that both ends of the intermediate weld zone have openings, and such deformations fall within the scope of protection of the present disclosure. In addition, the intermediate weld zone 131 and the edge weld zone 132 may be integrally formed, which can reduce the number of welded parts, and the assembly is simpler. In some embodiments, the two can also be connected separately, for example, by welding, which can increase the pair. The buffering effect of the intermediate weld zone.

Further, as shown in FIG. 8, the intermediate weld zone of the inner take-up member 109 may be formed with a receiving weld groove 133 for receiving the second weld zone 107 of the score member 101, the second weld of the receiving weld groove along the elongated structure. The region 107 extends to form an elongated structure, and may penetrate the intermediate weld zone in the up and down direction, or may not pass through the through hole structure, and may be seam welded (brazed, etc.) between the second weld zone 107 and the second weld zone 107. Achieve welding.

In the present embodiment, the scored region 105 of the score member 101 is formed as an elongated structure extending along the length direction of the cover plate 110, the score 104 extending along the length direction of the elongated structure, and the first land 103 and The second lands 107 are disposed on both sides in the height direction of the nick region 105 and are respectively formed as elongated structures extending along the length direction of the cover plate, and the intermediate lands 131 are correspondingly formed into an elongated structure and formed on the intermediate land 131 There is a receiving groove 133 for accommodating the second land 107.

Further, as shown in FIGS. 12 to 19, various cover insulating members 122 in the present disclosure will be described in detail. The inner lead-out member 109 is mounted on the cover plate 110 through the cover insulating member 122. The cover insulating member 122 has a first engaging portion 125 that is engaged with the cover plate 110 and a first engaging portion that is engaged with the inner lead-out member 109. Two latching portions 126. That is, the cover insulating member 122 can be stably mounted on the cover plate 110 by the snapped structure, so that the force transmitted from the battery core to the inner lead-out member 109 can be directly transmitted to the cover plate 110 during use of the battery, and then The effect of the pole core vibration process of the battery core on the score member 101 attached to the inner take-up member 109 is reduced to avoid accidental disconnection of the score 104.

As shown in FIG. 8, FIG. 12 and FIG. 13, in the first type of cover insulating member 122, the first engaging portion 125 and the second engaging portion 126 are respectively formed as annular card slots. In other embodiments, only the first latching portion 125 or the second latching portion 126 may be formed as an annular card slot. In this embodiment, the two latching portions are each formed as an annular card slot, except that the opening directions of the two annular card slots are opposite.

In some embodiments, the cover insulating member 122 includes a substrate 128 that is bonded to the lower surface of the cover plate 110. As shown in FIG. 8, the cover plate 110 is formed with an installation for mounting a current interrupting device (scraping or flipping member). The hole 127, as shown in FIGS. 12 and 13, the first engaging portion 125 includes a first annular projection 129 attached to the upper surface of the substrate 128, the first annular projection 129 having an L-shaped cross section to pass through After the mounting hole is folded outwardly, an annular card slot is formed with the substrate 128 to receive the hole wall of the mounting hole 127, that is, the opening of the annular card slot is located radially outward, so that the hole wall of the mounting hole 127 is inserted, and then the hole is wrapped. The wall achieves a stable snap-fit of the cover plate 110 and the cover insulator 122.

Different from the first engaging portion 125, as described above, since the inner lead-out member 109 can be formed into a sheet-like structure, the annular engaging groove formed by the second engaging portion 126 is for accommodating the outer peripheral edge of the inner lead-out member 109, that is, the annular portion The opening of the card slot is located radially inward so that the outer periphery of the inner take-up member 109 can be inserted to wrap its outer periphery, so that the mounting of the inner take-up member 109 is more stable. In some embodiments, the second snap portion 126 includes a second annular projection 130 coupled to a lower surface of the substrate 128, the second annular projection having an L-shaped cross section to have an opening on the radially inner side to be aligned with the substrate 128. An annular card slot is formed that receives the outer periphery of the inner take-up member. In some embodiments, the edge weld zone 132 of the sheet-like inner lead-out member 109 is located outside the intermediate weld zone 131 to be snapped into the annular card slot formed by the second catching portion 126. Thereby, the stable engagement of the cover insulating member 122 and the inner lead-out member 109 is completed.

As shown in FIG. 14 and FIG. 15, the second cover insulating member 122 has a first engaging portion 125 that is engaged with the cover plate 110. Unlike the first cover insulating member, the first card in this embodiment. The connecting portion 125 includes a first inverted tapered protrusion and/or a first inverted tapered groove, and the cover plate 110 is correspondingly formed with a second inverted tapered groove that positively receives the first inverted tapered protrusion. And/or a second inverted tapered protrusion that is positively fitted into the first inverted tapered groove, that is, the first engaging portion 125 includes a first inverted tapered protrusion, and the cover plate 110 is correspondingly formed with a form fit a first inverted tapered recess of the first inverted tapered protrusion; or the first engaging portion 125 includes a first inverted tapered recess, and the cover plate 110 is correspondingly formed with a shape fit into the first inverted tapered recess a second inverted tapered protrusion of the groove; or the first engaging portion 125 includes a first inverted tapered protrusion and a first inverted tapered groove, and the cover plate 110 is correspondingly formed with a form fit to receive the first inverted cone a convex second inverted tapered recess and a second inverted tapered projection that is positively fitted into the first inverted tapered recess, thereby passing the inverted tapered projection and The shape of the tapered groove cooperates to achieve the engagement between the cover insulating member 122 and the cover plate 110. The latching manner enables the cover insulating member 122 and the cover plate 110 to be surface-connected without protruding other structures. Therefore, it is more space-saving, and is particularly advantageous for the arrangement of the current interrupting device.

The first engaging portion 125 in this embodiment includes a first inverted tapered protrusion, and the cover plate 110 is correspondingly formed with a second inverted tapered groove that positively receives the first inverted tapered protrusion, or A latching portion 125 includes a first inverted tapered recess, and the cover plate 110 is correspondingly formed with a second inverted tapered projection that is positively fitted into the first inverted tapered recess.

In this embodiment, the first engaging portion 125 includes a plurality of first inverted tapered grooves, for example, two, and the cover plate 110 is disposed on the cover plate 110 to cooperate with the first inverted tapered groove. The second inverted tapered protrusion.

In another embodiment, the first engaging portion 125 includes a plurality of first inverted tapered protrusions. Correspondingly, a plurality of the first inverted tapered protrusions are disposed on the cover plate 110. The second inverted tapered groove.

In another embodiment, the first catching portion 125 includes a plurality of first inverted tapered grooves, for example two, the plurality of first inverted tapered grooves extending parallel to each other and adjacent to the first inverted tapered shape Forming a first inverted tapered protrusion between the grooves, correspondingly, the cover plate is provided with a plurality of second inverted tapered protrusions, for example, forming a second between two adjacent second inverted tapered protrusions An inverted tapered groove, that is, a first inverted tapered projection of the cover insulating member 122 is embedded in a second inverted tapered groove on the cover plate 110, and two second inverted cones on the cover plate 110 The shaped protrusions are embedded in the two first inverted tapered grooves on the cover insulating member 122, so that the stable connection of the cover plate 110 and the cover insulating member 122 is achieved by the manner in which the groove protrusions are staggered.

In this embodiment, the second latching portion 126 of the cover insulating member 126 and the inner lead-out member 109 are the same as the second latching portion of the first type of the cover insulating member, that is, the opening is formed on the radially inner side. An annular card slot for receiving the outer periphery of the inner take-up member 109 formed into a sheet-like structure. In some embodiments, the substrate 128 of the cover insulating member 122 is attached to the lower surface of the cover plate 110, and the second annular protrusion 130 of the second engaging portion 126 connected to the lower surface of the substrate 128 has an L-shaped cross section to The substrate 128 forms an annular card slot for receiving the outer periphery of the inner take-up member, and the edge land 132 of the inner lead member 109 is located outside the intermediate land 131 to snap into the annular card slot formed by the second catch portion 126.

As shown in FIG. 16, the third cover insulating member 122 has a second engaging portion 126 that is engaged with the inner lead-out member 109. The second engaging portion 126 includes a first inverted tapered protrusion and/or a first inverted portion. a tapered recess, the inner lead-out member 109 correspondingly forming a second inverted tapered recess that positively receives the first inverted tapered projection, and/or a shape fitably embedded in the first inverted tapered recess The second inverted tapered protrusion, that is, the second engaging portion 126 includes a first inverted tapered protrusion, and the inner lead member 109 is correspondingly formed with a second inverted tapered concave shape that positively accommodates the first inverted tapered protrusion. a second latching portion 126 includes a first inverted tapered recess, and the inner lead-out member 109 is correspondingly formed with a second inverted tapered projection that is positively fitted into the first inverted tapered recess; or a second card The joint portion 126 includes a first inverted tapered protrusion and a first inverted tapered groove, and the inner lead piece 109 is correspondingly formed with a second inverted tapered groove and shape that positively accommodates the first inverted tapered protrusion. A second inverted tapered protrusion that is mated with the first inverted tapered groove.

That is, in the embodiment, the snap-fit between the cover insulating member 122 and the inner lead-out member 109 is achieved by the shape matching of the inverted tapered projection and the inverted tapered recess, and the latching manner can make the cover insulating member 122 and the inner lead-out member 109 achieve a face-to-face connection without protruding other structures, thereby saving space, and particularly facilitating the arrangement of the current interrupting device.

The second latching portion 126 includes a plurality of first inverted tapered protrusions, for example, two. Correspondingly, the inner lead-out member 109 is provided with a plurality of second inverted surfaces that cooperate with the first inverted tapered protrusions. Tapered groove.

Alternatively, the second latching portion 126 includes a plurality of first inverted tapered recesses. Correspondingly, the inner lead-out member 109 is provided with a plurality of second inverted tapered projections that cooperate with the first inverted tapered recesses. Start.

Alternatively, the second catching portion 126 includes a plurality of first inverted tapered protrusions, for example two, the plurality of first inverted tapered protrusions extending parallel to each other and forming between adjacent first inverted tapered protrusions a first inverted tapered groove, correspondingly, the inner take-off member 109 is provided with a plurality of second inverted tapered grooves, for example two, and a second inverted cone is formed between the adjacent second inverted tapered grooves Shaped bumps. That is, as shown in FIG. 16, the two first inverted tapered projections of the cover insulating member 122 are embedded in the two second inverted tapered grooves on the inner lead-out member 109, and the first one on the inner lead-out member 109 The two inverted tapered protrusions are embedded in a first inverted tapered groove on the cover insulating member 122, so that the inner lead-out member 109 and the cover insulating member 122 are stabilized by the manner in which the groove protrusions are staggered. connection.

Wherein, the edge lands 132 of the inner lead-out member 109 forming the sheet-like structure are formed with a second inverted tapered protrusion and/or a second inverted tapered groove, that is, an edge, which is engaged with the second engaging portion 126. a second inverted tapered protrusion is formed on the weld zone 132; or a second inverted tapered groove is formed on the edge weld zone 132; or a second inverted tapered protrusion and a second inverted cone are formed on the edge weld zone 132 The groove, that is, in the present embodiment, as shown in Fig. 16, the two second inverted tapered grooves are formed on the edge land 132 on both sides of the intermediate land 131.

In this embodiment, the first engaging portion 125 of the cover insulating member 122 and the cover plate 110 are the same as the first engaging portion 125 of the first type of cover insulating member, that is, the opening is formed in the radial direction. In the embodiment, the cover insulating member 122 of the present embodiment includes a substrate 128 that is attached to the lower surface of the cover plate 110. The cover plate 110 is formed with a mounting hole 127 for mounting a current interrupting device. The first engaging portion 125 includes a first annular protrusion 129 connected to the upper surface of the substrate 128, the first annular protrusion having an L-shaped cross section to be folded outwardly to form a housing with the substrate 128 after passing through the mounting hole. The annular card slot of the hole wall of the mounting hole 127.

As shown in FIG. 17 to FIG. 19, the fourth cover insulating member 122 has a first engaging portion 125 that is engaged with the cover plate 110, and a mounting hole 127 for mounting a current interrupting device is formed on the cover plate 110, and The mounting hole 127 defines a plurality of latching holes 134. The cover insulating member 122 includes a substrate 128 that is attached to the lower surface of the cover plate 110. The first latching portion 125 includes a mounting portion extending upward from the upper surface of the substrate 128. The hole 127 is folded outwardly and downwardly through the ferrule structure of the snap hole and the substrate 128, so that the snap-fit between the cover plate 110 and the cover insulating member 122 is stabilized by the closed ferrule structure.

In some embodiments, the closed ferrule structure includes an annular projection 135 and a plurality of connecting posts 136 spaced circumferentially along the annular projection, the annular projection 135 having an L-shaped cross section to pass through the mounting hole Folding, the connecting post 136 passes through the engaging hole 134 and is connected between the annular protrusion 135 and the substrate 128, thereby forming a separate ferrule structure composed of the annular protrusion 135, the connecting post 136 and the substrate 128, wherein a plurality of The connecting posts 136 can be evenly distributed as shown in Figure 17 to ensure the strength of the ferrule structure. In some embodiments, the mounting hole 127 and the annular protrusion 135 are respectively formed as an elongated structure extending along the length direction of the cover plate 110, wherein the number of the connecting posts 136 located on both sides in the width direction of the mounting hole 127 is the same, and is equally spaced. Furthermore, the spacing of the connecting posts on both sides is also the same, that is, the connecting posts 136 on both sides are arranged one by one in the width direction, so that the strength of the ferrule structure is stable and can be uniformly transmitted from the battery core to the inner lead-out piece. The vibration of 109 is effectively transmitted to the cover plate 110 through the edge connection region 132, and the possibility of being affected on the score member 101 connected to the intermediate land 131 is reduced.

As shown in FIG. 18, the second latching portion 126 of the cover insulating member 122 and the inner lead-out member 109 in the embodiment is the same as the second latching portion of the first cover insulating member 122, that is, formed as The annular card slot with the opening on the radially inner side. The inner lead-out member 109 is formed into a sheet-like structure for accommodating the outer peripheral edge of the inner lead-out member 109, and the cover insulating member 122 is second with the lower surface of the substrate 128 that is bonded to the lower surface of the cover plate 110. The annular projection 130 has an L-shaped cross section to form an annular card slot with the base plate 128 that receives the outer periphery of the inner take-up member. The edge land 132 of the inner lead member 109 forming the sheet-like structure is located outside the intermediate land 131 to be caught in the annular card groove formed by the second engaging portion.

In some embodiments, the battery cover assembly 100 includes a cover plate 110, an inner lead-out member 109 located inside the cover plate 110, and an electrode outer terminal 112 located outside the cover plate 110. The inner lead-out member 109 and the outer electrode terminal 112 pass current. The interrupting device is electrically connected, and the current interrupting device comprises a scoring member 101 and a flip member 102. The flip member 102 is electrically connected to the electrode outer terminal 112, and the scoring member 101 is electrically connected to the inner lead member 109, and the scoring member 101 is formed with a score. 104 and electrically connected to the flip member 102, the flip member 102 can be operated under the action of air pressure to break the score 104, and the inner lead member 109 is mounted on the cover plate 110 through the cover member 110, and the cover member 110 has the inner portion The second latching portion 126 is connected to the leading member 109.

In some embodiments, the second snap portion 126 includes a first inverted tapered projection, and the inner lead member 109 is correspondingly formed with a second inverted tapered recess that positively receives the first inverted tapered projection.

In some embodiments, the second catching portion 126 includes a first inverted tapered recess, and the inner lead-out member 109 is correspondingly formed with a second inverted tapered projection that is positively fitted into the first inverted tapered recess.

In some embodiments, the second latching portion 126 includes a first inverted tapered protrusion and a first inverted tapered recess, and the inner lead-out member 109 is correspondingly formed with a shape-fittingly receiving the first inverted tapered projection. A second inverted tapered recess and a second inverted tapered projection that is positively fitted into the first inverted tapered recess.

In some embodiments, the second catching portion 126 includes a plurality of first inverted tapered protrusions, and correspondingly, the inner leading member 109 is provided with a plurality of second inverted tapered grooves. In some embodiments, the second latching portion 126 includes a plurality of first inverted tapered recesses. Correspondingly, the inner lead-out member 109 is provided with a plurality of second inverted tapered projections. In some embodiments, the second snap portion 126 includes a plurality of first inverted tapered protrusions that extend parallel to each other and form between adjacent first inverted tapered protrusions. A first inverted tapered groove, correspondingly, a plurality of second inverted tapered grooves are disposed on the inner lead-out member 109, and a second inverted tapered protrusion is formed between the adjacent second inverted tapered grooves.

In some embodiments, the cover 110 insulation further includes a first engaging portion 125 that is engaged with the cover 110. The cover 110 insulation includes a substrate that is bonded to the lower surface of the cover 110. The cover 110 is formed with a cover for The mounting hole of the current interrupting device is mounted, and the first engaging portion 125 includes a first annular protrusion 129 connected to the upper surface of the substrate, the first annular protrusion 129 having an L-shaped cross section to be outward after passing through the mounting hole An annular card slot that is folded over to form a hole wall of the mounting hole with the substrate.

The inner lead-out member 109 is formed as a sheet-like structure having an intermediate land 131 electrically connected to the score member 101 and an edge land 132 electrically connected to the battery core, and the second card is formed on the edge land 132 The second inverted tapered recess is engaged with the second portion 126; in some embodiments, the second reverse tapered projection is engaged with the second engaging portion 126; in some embodiments, A second inverted tapered groove and a second inverted tapered protrusion that are engaged with the second engaging portion 126 are formed on the edge land 132.

In some embodiments, the thickness of the edge land 132 is greater than or equal to the thickness of the intermediate land 131. When the thickness of the intermediate land 131 is small, the edge land 132 can be formed into a stepped structure with a height difference, as shown in FIG. The two are not in the same plane in the vertical direction, so that when the edge soldering region 132 and the battery core or the other adapter between the battery core are soldered, the connection to the intermediate land 131 can be performed. The score member 101 serves as a cushioning function.

In some embodiments, the score member 101 includes a scored region 105 formed with a score 104, a first land 103 for electrically interconnecting the flip member 102, and a second weld for electrical connection with the inner lead member 109. The region 107, the scored region 105 is formed as an elongated structure extending along the length direction of the cap plate 110, the score 104 extending along the length direction of the elongated structure, and the first land 103 and the second land 107 are set in the engraved The two sides of the height direction of the mark region 105 are respectively formed into an elongated structure extending along the longitudinal direction of the cover plate 110, the intermediate land portion 131 is correspondingly formed into an elongated structure, and the intermediate land portion 131 is formed with a second land lands 107. The shims are accommodated.

As shown in FIG. 20, the unit battery 200 provided by the present disclosure includes a housing 111, a battery core housed in the housing, and the above-described battery cover assembly 100 of the package housing, and the inner lead-out member 109 is electrically connected to the battery core, and The flip member 102 is in gaseous communication with the interior of the housing.

As shown in FIG. 20 , the battery module 300 provided by the present disclosure is provided with the above-mentioned unit battery 200 in the battery module 300 .

As shown in FIG. 20, the power battery 400 provided by the present disclosure includes a package body and the above-described battery module 300 disposed in the package body.

As shown in FIG. 20, the present disclosure provides an electric vehicle 500 provided with the above-described power battery 400.

The five embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the present disclosure within the technical idea of the present disclosure. These simple variations are all within the scope of the disclosure.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure is applicable to various possibilities. The combination method will not be described separately.

In addition, any combination of various embodiments of the present disclosure may be made as long as it does not deviate from the idea of the present disclosure, and should also be regarded as the disclosure of the present disclosure.

Claims

A battery cover assembly, comprising: a cover plate, an inner lead-out member located inside the cover plate, and an outer electrode terminal located outside the cover plate, wherein the inner lead-out member and the outer electrode terminal pass the current interrupting device Electrically connecting, the current interrupting device includes a scoring member and a flipping member, the flip member is electrically connected to the outer electrode terminal, the scoring member is electrically connected to the inner lead member, and the scoring member is formed Engraved and electrically connected to the inverting member, the inverting member being capable of acting under air pressure to break the indentation, the inner ejecting member being mounted on the cover plate by a cover insulating member, The cover insulating member has a second engaging portion that is engaged with the inner lead-out member;

The second engaging portion includes a first inverted tapered protrusion, and the inner leading member is correspondingly formed with a second inverted tapered groove that positively receives the first inverted tapered protrusion;

Or the second latching portion includes a first inverted tapered recess, and the inner lead-out member is correspondingly formed with a second inverted tapered projection that is positively fitted into the first inverted tapered recess;

Or the second latching portion includes a first inverted tapered protrusion and a first inverted tapered recess, and the inner lead-out member is correspondingly formed with a shape that positively accommodates the first inverted tapered protrusion A second inverted tapered recess and a second inverted tapered projection that is positively fitted into the first inverted tapered recess.
The battery cover assembly according to claim 1, wherein the second engaging portion comprises a plurality of first inverted tapered protrusions, and correspondingly, the inner leading member is provided with a plurality of second inverted portions. Tapered groove.
The battery cover assembly according to claim 1, wherein the second engaging portion comprises a plurality of first inverted tapered grooves, and correspondingly, the inner leading member is provided with a plurality of second inverted portions. Conical projection.
A battery cover assembly according to claim 1, wherein said second engaging portion includes a plurality of first inverted tapered projections extending in parallel with each other and Forming a first inverted tapered groove between the adjacent first inverted tapered protrusions, correspondingly, the inner lead-out member is provided with a plurality of second inverted tapered grooves, adjacent to the second inverted tapered shape One of the second inverted tapered projections is formed between the grooves.
The battery cover assembly according to any one of claims 1 to 4, wherein the cover insulating member further comprises a first engaging portion that is engaged with the cover plate.
The battery cover assembly according to claim 5, wherein the cover insulating member comprises a substrate attached to a lower surface of the cover, and the cover is formed with a current interrupting device for mounting a mounting hole, the first engaging portion includes a first annular protrusion connected to an upper surface of the substrate, the first annular protrusion having an L-shaped cross section to be folded outward after passing through the mounting hole And forming an annular card slot for the hole wall of the mounting hole with the substrate.
The battery cover assembly according to any one of claims 1 to 4, wherein the inner lead member is formed in a sheet-like structure having an intermediate land electrically connected to the scoring member And an edge welding zone electrically connected to the battery core, wherein the edge welding zone is formed with the second inverted tapered groove that is engaged with the second clamping portion;

Or a second inverted tapered protrusion that is engaged with the second engaging portion is formed on the edge welding portion;

Or a second inverted tapered groove and a second inverted tapered protrusion that are engaged with the second engaging portion are formed on the edge welding portion.
The battery cover assembly according to claim 7, wherein the thickness of the edge land is greater than or equal to the thickness of the intermediate land.
A battery cover assembly according to claim 7 or 8, wherein said score member comprises a scored region formed with a score, a first land for electrically connecting to said flip member, and In a second lands electrically connected to the inner lead-out member, the scored region is formed as an elongated structure extending along a length direction of the cover plate, the score extending along a length direction of the elongated structure, and The first weld zone and the second weld zone are disposed on both sides of the height direction of the score zone and are respectively formed as elongated structures extending along the length direction of the cover plate, and the intermediate weld zone is correspondingly formed Long structure.
The battery cover assembly according to claim 9, wherein said intermediate land is formed with a receiving groove for accommodating said second land.
A unit cell characterized by comprising a casing, a battery core housed in the casing, and a battery cover assembly enclosing the casing, the battery cover assembly being according to claims 1-10 In any of the battery cover assemblies of the present invention, the inner lead member is electrically connected to the battery core, and the flip member is in gas communication with the interior of the outer casing.
A battery module, characterized in that the battery module is provided with the unit battery according to any one of claims 11.
A power battery comprising a package body and a battery module disposed in the package body, wherein the battery module is the battery module according to claim 11.
An electric vehicle characterized in that the electric vehicle is provided with the power battery according to claim 13.