CN213601922U - Top cover structure of power battery and power battery - Google Patents

Abstract

The utility model belongs to the technical field of battery production and manufacture, in particular to a top cover structure of a power battery and the power battery, which comprises a plastic top cover plate (1); the plastic part (2) is connected with the top cover plate (1); wherein, the top cap has installation state and preinstallation state, wherein, when being in the installation state, plastic part (2) move to top cover piece (1) syntropy position department. The utility model discloses can simplify the top cap structure, reduce the manufacturing cost of battery, can also prevent to scratch the pole piece of electric core, improve the security of battery.

Description

Top cover structure of power battery and power battery

Technical Field

The utility model belongs to the technical field of the battery production is made, concretely relates to power battery's top cap structure and power battery.

Background

Nowadays, with the development of modern society and the enhancement of environmental awareness of people, more and more devices select a lithium battery as a power supply, such as a mobile phone, a notebook computer, an electric tool, an electric automobile and the like, which provides a wide space for the application and development of the lithium battery. Among them, lithium batteries used in electric tools, electric vehicles, and the like are generally called power batteries.

The structure of top cap piece aluminum product stamping forming has been widely used in power battery top cap setting all the time, and under the ordinary circumstances, the design has utmost point post, explosion-proof valve, notes liquid hole isotructure on the aluminium top cap piece, and the apron structure through punching press formation, top cap include top cap piece, positive and negative utmost point post, go up plastic, sealing washer and plastic down, and the part kind is many, and is with high costs, and produces metal fillings or wire easily in manufacturing process, causes electric core short circuit even to scrap easily.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model lies in: to prior art's not enough, provide a power battery's top cap structure, can simplify top cap structure, reduce the manufacturing cost of battery, can also prevent to scrape the pole piece of rubbing electric core, improve the security of battery.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a top cover structure of a power battery comprises a plastic top cover plate; the plastic part is connected with the top cover plate; wherein, the top cap has installation state and preinstallation state, wherein, when being in when the installation state, the plastic part moves to top cap piece syntropy position department.

Preferably, the top cover plate with be provided with the kink between the plastic part, the plastic part can be followed the kink to the top cover plate is folded, the kink is in at least one department connects after the folding of plastic part.

Preferably, the height of the bent part is 0.1-1.0 mm in the height direction.

Preferably, at least one end of the top cover sheet extends outwards to form the plastic part in the length direction, or the top cover sheet extends outwards to form the plastic part at any position between the two ends of the top cover sheet.

Preferably, at least one of the top cover plate and the plastic part is provided with a clamping part and/or a buckling part, and the top cover plate is connected with the plastic part in a buckling mode.

Preferably, the plastic part is provided with inclined surfaces at edges of two sides in the width direction.

Preferably, the top cap piece is provided with at least one kind in annotating liquid hole and the explosion-proof valve, the plastic part is provided with the mesh, the mesh corresponds the setting and is in annotate the below in liquid hole, the mesh is close to the one side of annotating the liquid hole is provided with the arch, the arch centers on the mesh sets up, the explosion-proof valve with top cap piece formula structure as an organic whole, the outside of explosion-proof valve with the corresponding department of top cap piece is equipped with the nick.

Preferably, the top cover structure of the power battery further comprises a pole, and the pole comprises a column body and a bottom plate arranged at the bottom of the column body; the top cover plate is provided with a pole mounting hole; the top of the pole mounting hole is provided with a convex hull, the convex hull is arranged around the top of the column body, the inner wall of the pole mounting hole is in concave-convex fit with the side wall of the column body, the bottom of the pole mounting hole is provided with a groove, and the bottom plate is accommodated in the groove.

Preferably, the top cover structure of the power battery further comprises a connecting sheet, the connecting sheet is located between the top cover sheet and the plastic part along the height direction and is connected in series between the pole post and the pole lug of the battery cell, at least one connecting sheet is provided with a notch matched with the pole post, and the material of the connecting sheet is the same as the material of the current collecting material of the pole piece of the battery cell electrically connected with the connecting sheet and the material of the bottom plate.

A second object of the present invention is to provide a power battery, which comprises a casing having an opening; the battery cell is accommodated in the shell; according to the top cover structure of the power battery, the top cover sheet is fixed to the opening and used for sealing the battery core in the shell, and the filling material is arranged between the top cover sheet and the opening.

The utility model has the advantages that the utility model comprises a plastic top cover plate; the plastic part is connected with the top cover plate; wherein, the top cap has installation state and preinstallation state, wherein, when being in when the installation state, the plastic part moves to top cap piece syntropy position department. Because the aluminum top cover plate is provided with the structures of the pole post, the explosion-proof valve, the liquid injection hole and the like and the cover plate structure formed by stamping, the top cover comprises the top cover plate, the positive pole post, the negative pole post, the upper plastic cement, the sealing ring and the lower plastic cement, the parts are various, the cost is high, and metal chips or metal wires are easy to generate in the manufacturing process, which easily causes short circuit and even scrapping of the battery core, therefore, the plastic part is rotationally connected with the top cover plate, so that the top cover plate and the plastic part form an integrated design, which is equivalent to a single part, the top cover has an installation state and a pre-installation state, and the plastic part moves to the same-direction position of the top cover plate, so that the assembly error is small, the installation and the positioning of the top cover plate and the plastic part are facilitated, the lug cushion plate or the lower plastic mounted at the top of the top cover plate is omitted, the assembly steps are simplified, the condition of neglected assembly in the assembly process is avoided, the production process is facilitated to be simplified, and the manufacturing cost is reduced; in addition, adopt the top cap piece of plastic, not only play insulating just, the effect of negative pole post, plastic has been saved and has been installed, the sealing washer reaches lower plastic, furthermore, the top cap piece of plastic is in the manufacture process, do not produce metal fillings or wire, reduce the probability of scraping the pole piece of electric core, ensure cohesion and leakproofness between top cap piece and the utmost point post, help reducing the holistic height of top cap, reduce the space that the top cap invades to account for battery inside, help improving the energy density of battery, make the weight reduction of top cap piece simultaneously, help reducing the holistic weight of battery, thereby improve the weight energy density of battery. The pre-installation state comprises that the plastic part is in an unfolded state, and the state that any angle except the angle between the top cover plate and the plastic part can be formed is also included; the top cover plate can be integrated with the pole in an injection molding mode, at least part of the top cover plate covers the side of the pole, the sealing performance between the top cover plate and the pole is improved, and the probability of leakage of electrolyte is reduced. The utility model discloses can simplify the top cap structure, reduce the manufacturing cost of battery, can also prevent to scratch the pole piece of electric core, improve the security of battery.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a pre-installation state according to a first embodiment of the present invention.

Fig. 2 is a schematic bottom view of a pre-assembled state according to a first embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of a pre-assembled state according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of an embodiment of the present invention in an installation state.

Fig. 5 is a schematic bottom view of the first embodiment of the present invention in an installed state.

Fig. 6 is a schematic sectional view of an embodiment of the present invention in an assembled state.

Fig. 7 is a schematic structural diagram of the fourth embodiment of the present invention in a pre-installation state.

Fig. 8 is a schematic structural view of the fourth embodiment of the present invention in an installation state.

Fig. 9 is an exploded view of a fourth embodiment of the present invention.

Wherein the reference numerals are as follows:

1-top cover sheet; 11-liquid injection hole; 12-an explosion-proof valve; 13-pole mounting hole; 131-convex hull; 132-a groove; 121-scoring;

2-plastic parts; 21-mesh; 211-protrusions;

3-bending part;

4-a clamping part;

5-a buckle part;

6-inclined plane;

7-pole column; 71-a column; 72-a base plate;

8-connecting sheets; 81-notch;

9-a housing; 91-opening;

10-electric core;

20-a filler;

x-length direction;

y-width direction;

z-height direction.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The present invention will be described in further detail with reference to fig. 1 to 9, but the present invention is not limited thereto.

Implementation mode one

A top cover structure of a power battery comprises a plastic top cover plate 1; the plastic part 2 is connected with the top cover plate 1; wherein, the top cap has installation state and preinstallation state, and wherein, when being in the installation state, plastic part 2 moves to top flap 1 syntropy position department.

As the aluminum top cover plate is provided with the structures of the pole post, the explosion-proof valve, the liquid injection hole and the like, and the cover plate structure formed by stamping, the top cover comprises the top cover plate, the positive pole post, the negative pole post, the upper plastic cement, the sealing ring and the lower plastic cement, the parts are various and have high cost, and metal chips or metal wires are easy to generate in the manufacturing process, so that the short circuit and even scrapping of the electric core are easy to cause, therefore, as shown in the figures 1 to 6, the plastic part 2 is rotationally connected with the top cover plate 1, the top cover plate 1 and the plastic part 2 form an integrated design which is equivalent to a single part, the top cover has an installation state and a pre-installation state, the plastic part 2 moves to the same-direction position of the top cover plate 1, the assembly error is small, the top cover plate 1 and the plastic part 2 are convenient to install and position, the pole lug cushion plate or the lower plastic cement, the production process is facilitated to be simplified, so that the manufacturing cost is reduced; in addition, adopt the top cap piece 1 of plastic, not only play insulating just, the effect of negative pole post, the installation is gone up the plastic, the sealing washer reaches lower plastic, and, the top cap piece 1 of plastic is in the manufacturing process, do not produce metal fillings or wire, reduce the probability of scraping the pole piece of electric core 10, ensure cohesion and leakproofness between top cap piece 1 and the utmost point post 7, help reducing the holistic height of top cap, reduce the inside space of top cap encroachment battery, help improving the energy density of battery, make the weight of top cap piece 1 reduce simultaneously, help reducing the holistic weight of battery, thereby improve the weight energy density of battery. The pre-installation state comprises but is not limited to a state that the lower plastic part is unfolded, and a state that any angle except 0 degree can be formed between the top cover plate 1 and the plastic part 2; the top cover plate 1 can be integrated with the pole 7 through injection molding, and the top cover plate 1 at least partially covers the side part of the pole 7, so that the sealing performance between the top cover plate 1 and the pole 7 is improved, and the probability of electrolyte leakage is reduced.

According to the utility model discloses an among the power battery's top cap structure, be provided with kink 3 between top cap piece 1 and the plastic part 2, plastic part 2 can be followed kink 3 and folded to top cap piece 1, and kink 3 connects in 2 folding back at least one department of plastic part, and on direction of height Z, the high D of kink 3 is 0.1 mm. Increase kink 3 for top cover plate 1 and plastic part 2 can be buckled at kink 3, and the height D of injecing kink 3 is the minimum, prevents that kink 3's high undersize from leading to the size of buckling of kink 3 to be restricted or break easily, influences plastic part 2 and normally buckles, leads to the dimensional tolerance to add up even, and plastic part 2 takes place to warp.

According to the utility model discloses an among the power battery's top cap structure, on length direction X, the both ends of top sheet 1 outwards extend and form plastic part 2. Top cap piece 1 and plastic part 2 adopt the integrated into one piece structure, not only can improve 1 holistic rigidity of top cap piece, can also simplify manufacturing process, and the reduction in production cost is helped to control size error, improve the accuracy of the location of top cap piece 1 and plastic part 2, wherein, 2 intervals of two plastic parts set up, not only saved and set up the explosion-proof valve bleeder vent at plastic part 2, simplify 2 production technology of plastic part, still make the lower extreme of explosion-proof valve 12 not have plastic part 2 to cover, avoid plastic part 2 to plug up explosion-proof valve 12 because of high temperature melting, ensure that explosion-proof valve 12 can normally open the valve, and simultaneously, the lower extreme of explosion-proof valve 12 does not have plastic part 2, help reducing the holistic weight of top cap, improve the weight energy density of battery.

In the top cap structure according to the utility model discloses an among the power battery's, see that fig. 4 to fig. 6 are shown, top sheet 1 is provided with knot portion 5, and plastic part 2 is provided with card portion 4, and top sheet 1 is connected with plastic part 2 buckles. It is specific, detain portion 5 is the cylinder, the top of detaining portion 5 is provided with detains the post, card portion 4 is hollow card post, the area of detaining the post is a bit more than the area of card post, be convenient for dismantle and install detain portion 5 and card portion 4, and when plastic part 2 takes place to warp or split, can change first plastic part 2, help reducing the holistic cost of maintenance of plastic part down, and simultaneously, make top cap piece 1 and plastic part 2 removable, help improving the flexibility of the production of top cap, but the utility model discloses do not so limit, because of when assembling the battery, the arranging of each part in different models or the not unidimensional its casing of battery also can be different, plastic part 2 upset back and top cap piece 1 fixed connection, fixed connection mode still includes the bonding, hot melt connects and the supersound. The shape of the buckle part 5 and the card part 4 can be round, oval or square.

In the top cap structure of the power battery according to the present invention, referring to fig. 1 to 3, the plastic part 2 is provided with inclined planes 6 at two side edges of the width direction Y. Increase inclined plane 6, can further avoid the utmost point ear of book electric core 10 of in the assembling process, and inclined plane 6 is plane or protruding curved surface down, preferably protruding curved surface down, can avoid utmost point ear to buckle at the corner of plastic part 2 and cause stress concentration, or the condition of edge closed angle puncture pole piece, in addition, inclined plane 6 is convenient for when electric core 10 is tied up, and the pole piece is not harmed in the rounding off, can reduce the wearing and tearing to the utmost point ear of electric core 10, further protects utmost point ear, the life of extension battery.

According to the utility model discloses an among power battery's the top cap structure, top cap piece 1 is provided with annotates in liquid hole 11 and the explosion-proof valve 12 at least one, and plastic part 2 is provided with mesh 21, and mesh 21 corresponds the setting in the below of annotating liquid hole 11, and mesh 21 is close to the one side of annotating liquid hole 11 and is provided with protruding 211, and protruding 211 is around mesh 21 setting, explosion-proof valve 12 and top cap piece 1 formula structure as an organic whole, and the outside of explosion-proof valve 12 is equipped with nick 121 with the corresponding department of top cap piece 1. Increase and annotate liquid hole 11, inside electrolyte entered into the battery from annotating liquid hole 11 of battery top cap of being convenient for, guarantee to annotate liquid efficiency, mesh 21 can intercept from annotating the formation nail or the foreign matter that the liquid hole fell into, help improving the security of battery. Specifically, the mesh 21 may be formed by a plurality of sectors, a plurality of parallel fences, or a plurality of triangular holes, circular holes, square holes, and other holes with various shapes, and the plurality of holes may be arranged according to a certain rule to form a liquid injection channel, so as to meet the requirement of intercepting formed nails or foreign matters falling from the liquid injection hole 11; the protrusion 211 abuts against the lower part of the liquid injection hole 11 to form a space for accommodating formed nails or foreign matters, so that the formed nails can be prevented from falling into the gap between the top cover plate 1 and the plastic part 2 from the liquid injection port 81, and the safety of the battery is improved. Wherein, explosion- proof valve 12 and 1 formula structure as an organic whole of top cap piece, welding explosion-proof valve 12 has been saved, therefore, the cost is reduced, the safety performance of electric core 10 is improved, and simultaneously, the arch of 12 central designs of explosion-proof valve, be used for dispersion stress, stabilize the blasting value, improve electric core 10 safety performance, furthermore, nick 121 department is more weak than its explosion-proof valve 12 and top cap piece 1 that connect, generate heat when the battery is inside and produce gas, when internal pressure reaches a definite value, the nick 121 of explosion-proof valve 12 breaks under the effect of internal pressure, prevent that the battery from pressing the too big explosion that leads to in.

In the top cover structure of the power battery according to the present invention, the top cover structure of the power battery further includes a pole 7, and the pole 7 includes a column 71 and a bottom plate 72 disposed at the bottom of the column 71; the top cover plate 1 is provided with a pole mounting hole 13; the top of the pole mounting hole 13 is provided with a convex hull 131, the convex hull 131 is arranged around the top of the column 71, the inner wall of the pole mounting hole 13 is in concave-convex fit with the side wall of the column 71, the bottom of the pole mounting hole 13 is provided with a groove 132, and the bottom plate 72 is accommodated in the groove 132. The convex hull 131 can surround the top of the column body 71, can improve the pole 7 on the protective top cover plate 1, limit the position of the pole 7, reduce the contact probability between the pole 7 and an external conductive component, and simultaneously help to reduce the space occupied by the pole 7 in the battery and improve the energy density of the battery, the bottom plate 72 is accommodated in the groove 132, namely, the bottom plate 72 is embedded into the bottom of the top cover plate 1 and is matched with the convex hull 131 to play a role in fixing the pole 7, so that the probability of displacement or shaking of the pole 7 is reduced, meanwhile, the overall height of the top cover is reduced, the space occupied in the battery is reduced, and the energy density of the battery is improved; the inner wall of utmost point post mounting hole 13 and the unsmooth cooperation of the lateral wall of cylinder 71 play the effect of fixed utmost point post 7, and is concrete, and cylinder 71 outer wall is provided with the concave part, and the inner wall of utmost point post mounting hole 13 is provided with the convex part, nevertheless the utility model discloses not so limit, cylinder 71 outer wall is provided with the convex part, and the inner wall of utmost point post mounting hole 13 is provided with the concave part, and it can to satisfy two unsmooth cooperations.

The battery in this embodiment has two poles 7, namely a first pole and a second pole, which are all disposed on the top cover plate 1, and the first pole can be a positive pole or a negative pole, and correspondingly, the second pole is a negative pole or a positive pole. In the embodiment, the first pole serves as an anode, the second pole serves as a cathode, when the first pole serves as an anode, the bottom plate 72, the column 71 and the connecting sheet 8 connected with the column can be made of metal aluminum, and the bottom plate 72 and the column 71 can be integrally formed, so that the quality of the battery can be guaranteed not to be affected, and the production cost of the first pole is reduced; the second pole column is used as a negative electrode, the column body 71 can be made of metal aluminum, the base plate 72 is made of metal copper, the base plate 72 and the column body 71 are made of composite pole columns, the quality of the battery can be guaranteed not to be affected, and the production cost of the second pole column is reduced.

The utility model discloses a theory of operation is:

the plastic part 2 is rotationally connected with the top cover plate 1, so that the top cover plate 1 and the plastic part 2 form an integrated design, the integrated design is equivalent to a single part, the top cover has an installation state and a pre-installation state, the plastic part 2 moves to the same-direction position of the top cover plate 1, not only is the assembly error smaller, but also the top cover plate 1 and the plastic part 2 are convenient to install and position, a lug base plate or lower plastic is omitted from the top of the top cover plate 1, the assembly steps are simplified, the condition of neglected assembly in the assembly process is avoided, the production process is facilitated to be simplified, and the manufacturing cost is reduced; in addition, adopt the top cap piece 1 of plastic, not only play insulating just, the effect of negative pole post, the installation is gone up the plastic, the sealing washer reaches lower plastic, and, the top cap piece 1 of plastic is in the manufacturing process, do not produce metal fillings or wire, reduce the probability of scraping the pole piece of electric core 10, ensure cohesion and leakproofness between top cap piece 1 and the utmost point post 7, help reducing the holistic height of top cap, reduce the inside space of top cap encroachment battery, help improving the energy density of battery, make the weight of top cap piece 1 reduce simultaneously, help reducing the holistic weight of battery, thereby improve the weight energy density of battery.

Second embodiment

The difference from the first embodiment is that: this embodiment is on length direction X, top plate 1 outwards extends and forms plastic part 2 in arbitrary one department between its two tip, top plate 1 is provided with card portion 4, plastic part 2 is provided with detains portion 5, top plate 1 is connected with plastic part 2 buckle, in direction of height Z, the high D of kink 3 is 1mm, power battery's top cap structure still includes connection piece 8, lie in between top plate 1 and plastic part 2 along direction of height Z, and establish ties between utmost point ear of utmost point post 7 and electric core 10, at least one connection piece 8 is provided with the breach 81 with utmost point post 7 complex, the material of connection piece 8 material and bottom plate 72 all is the same rather than the mass flow material of the pole piece of the electric core 10 of electricity connection. According to the structure of the actual battery, the top cover plate 1 extends outwards at any position between the two end parts to form the plastic part 2, and the requirement that the top cover plate 1 and the plastic part 2 are connected in a rotating mode is met; according to the actual battery structure, the top cover plate 1 can be provided with a clamping part 4, the plastic part 2 can be provided with a buckling part 5, and the top cover plate 1 and the plastic part 2 can be buckled in a mounting state; the height D of the bent portion 3 is defined as the maximum value, and the bent portion 3 is prevented from being excessively large, resulting in excessive encroachment of the space inside the battery, which is not favorable for improving the energy density of the battery, and also resulting in an increase in production cost.

When the number of the battery cells in the battery is large or the first tab is short, the connecting sheet 8 is used in the assembling process, and the connecting sheet 8 comprises a first connecting sheet and a second connecting sheet. For example, the number of the battery cells 10 is at least two, and each battery cell 10 is connected with a first tab and a second tab. When first utmost point ear and second utmost point ear all are two at least, it can twine in the both sides of plastic part 2, for example, the folded portion of first utmost point ear is located the both sides of upset piece respectively, and the weld part of first utmost point ear all is connected with first utmost point post through first connection piece. The second utmost point ear all is connected with the second utmost point post through the second connection piece, has realized improving battery internal connection's stability. At least one connection piece 8 is provided with utmost point post 7 complex breach 81, and is concrete, is provided with breach 81 with the connection piece 8 of positive post connection for utmost point post 7 is avoided to this connection piece 8, prevents to touch utmost point post 7, can break off utmost point ear when electric current is big, guarantees electric core 10 safety. The connecting sheet 8 and the bottom plate 72 are made of the same current collecting material as the pole pieces of the battery cell 10 electrically connected thereto, i.e. the same metal material as the corresponding negative pole piece, for example, the connecting sheet 8 and the bottom plate 72 connected to the negative pole piece are made of copper, which helps to reduce the voltage difference between them.

Other structures are the same as those of the first embodiment, and are not described herein again.

Third embodiment

The difference from the first embodiment is that: in the length direction X of the present embodiment, one end of the top cover plate 1 extends outward to form the plastic part 2, the top cover plate 1 is provided with the fastening portion 5 and the fastening portion 4, the plastic part 2 is provided with the fastening portion 4 and the fastening portion 5, the top cover plate 1 is connected with the plastic part 2 in a fastening manner, and in the height direction Z, the height D of the bending portion 3 is 0.5 mm. One end part of the top cover plate 1 extends outwards to form the plastic parts 2, when the battery is assembled, only one plastic part 2 needs to be bent towards the top cover plate 1, the step of bending the other plastic part 2 is omitted, the production process is simplified, and therefore the production efficiency is improved; according to the actual battery structure, the top cover plate 1 is provided with a buckling part 5 and a clamping part 4, the plastic part 2 is provided with the clamping part 4 and the buckling part 5, and the top cover plate 1 and the plastic part 2 can be buckled in an installation state; the height D of the limited bending part 3 is an intermediate value, so that the production cost is reduced, and the bending size of the bending part 3 can be ensured, so that the plastic part 2 is normally bent, and the plastic part 2 is prevented from deforming.

Other structures are the same as those of the first embodiment, and are not described herein again.

Embodiment IV

A power battery comprises a housing 9 provided with an opening 91; the battery cell 10 is accommodated in the shell 9; in the top cover structure of the power battery according to the first embodiment, the top cover sheet 1 is fixed to the opening 91 for enclosing the battery cell 10 in the casing 9, and the filling material 20 is disposed between the top cover sheet 1 and the opening 91.

It should be noted that: referring to fig. 7 to 9, the top cover plate 1 and the case 9 are welded together by welding, and the filler 20 is used to fix the top cover plate 1 and the case 9 by ultrasonic or hot melting, which helps to improve the sealing performance between the top cover plate 1 and the case 9, reduce the probability of electrolyte leakage, improve the mechanical strength of the top cover plate 1 and the case 9, and prolong the service life of the battery.

Fifth embodiment

A power battery comprises a housing 9 provided with an opening 91; the battery cell 10 is accommodated in the shell 9; in the top cover structure of the power battery according to the second embodiment, the top cover sheet 1 is fixed to the opening 91 for enclosing the battery cell 10 in the casing 9, and the filling material 20 is disposed between the top cover sheet 1 and the opening 91.

It should be noted that: the battery cell 10 includes a positive plate, a diaphragm and a negative plate, which can be sequentially stacked and wound, wherein the positive plate includes a positive current collector and a positive active material coated on the surface of the positive current collector, and the negative plate includes a negative current collector and a negative active material coated on the surface of the negative current collector. First utmost point ear is connected in the anodal mass flow body, and the second utmost point ear is connected in the negative pole mass flow body, and the edge of the anodal mass flow body can have the blank area that is not covered by anodal active material, and first utmost point ear can be directly formed through cutting the blank area. Similarly, the second tab can be directly cut through the blank area of the negative current collector, and in addition, the first tab and the second tab can also be fixed on the blank area of the positive plate and the negative plate respectively through welding. The first pole lug and the first pole post are connected in a laser welding mode, and the second pole lug and the second pole post are connected.

Sixth embodiment

A power battery comprises a housing 9 provided with an opening 91; the battery cell 10 is accommodated in the shell 9; in the top cover structure of the power battery according to the third embodiment, the top cover sheet 1 is fixed to the opening 91 for enclosing the battery cell 10 in the casing 9, and the filling material 20 is disposed between the top cover sheet 1 and the opening 91.

It should be noted that: during use, the battery cell 10 in the battery is prone to shaking. If the battery applied to the electric vehicle is used, the battery cell 10 in the battery is easy to shake due to the shake of the vehicle in the traveling process, and in order to solve the problem, the ratio of the contact area between the plastic part 2 and the top surface of the battery cell 10 to the total area of the top surface of the battery cell 10 is set to be larger than a preset value. The one side of plastic part 2 and the contact of electric core 10 top surface is planar structure, if the area undersize of the contact of plastic part 2 and electric core 10 top surface, cause electric core 10 to rock easily, the part of the contact of plastic part 2 and electric core 10 top surface can play spacing effect to electric core 10, the condition that electric core 10 appears rocking easily in having realized reducing the battery, so, establish the area of the contact of plastic part 2 and electric core 10 top surface and the total area of electric core 10 top surface than to be greater than the default.

Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (10)

1. A top cap structure of power battery, characterized by includes:

a plastic top cover sheet (1);

the plastic part (2) is connected with the top cover plate (1);

wherein, the top cap has installation state and preinstallation state, wherein, when being in the installation state, plastic part (2) move to top cover piece (1) syntropy position department.

2. The top cover structure of a power battery as claimed in claim 1, wherein: top cap piece (1) with be provided with kink (3) between plastic part (2), plastic part (2) can be followed kink (3) to top cap piece (1) is folding, kink (3) are in at least one department connects after folding of plastic part (2).

3. The top cover structure of a power battery as claimed in claim 2, wherein: in the height direction (Z), the height (D) of the bending part (3) is 0.1-1.0 mm.

4. The top cover structure of a power battery as claimed in claim 1, wherein: in the length direction (X), at least one end part of the top cover sheet (1) extends outwards to form the plastic part (2), or any position between the two end parts of the top cover sheet (1) extends outwards to form the plastic part (2).

5. The top cover structure of a power battery as claimed in claim 1, wherein: at least one of the top cover plate (1) and the plastic part (2) is provided with a clamping part (4) and/or a buckling part (5), and the top cover plate (1) is connected with the plastic part (2) in a buckling mode.

6. The top cover structure of a power battery as claimed in claim 1, wherein: the edges of two sides of the plastic part (2) in the width direction (Y) are provided with inclined planes (6).

7. The top cover structure of a power battery as claimed in claim 1, wherein: top cap piece (1) is provided with annotates at least one kind in liquid hole (11) and explosion-proof valve (12), plastic part (2) are provided with mesh (21), mesh (21) correspond the setting and are in annotate the below of liquid hole (11), mesh (21) are close to the one side of annotating liquid hole (11) is provided with arch (211), arch (211) center on mesh (21) set up, explosion-proof valve (12) with top cap piece (1) formula structure as an organic whole, the outside of explosion-proof valve (12) with the corresponding department of top cap piece (1) is equipped with nick (121).

8. The top cover structure of a power battery as claimed in claim 1, wherein: the top cover structure of the power battery further comprises a pole post (7), wherein the pole post (7) comprises a cylinder body (71) and a bottom plate (72) arranged at the bottom of the cylinder body (71);

the top cover plate (1) is provided with a pole mounting hole (13);

the top of the pole mounting hole (13) is provided with a convex hull (131), the convex hull (131) is arranged around the top of the column body (71), the inner wall of the pole mounting hole (13) is in concave-convex fit with the side wall of the column body (71), the bottom of the pole mounting hole (13) is provided with a groove (132), and the bottom plate (72) is accommodated in the groove (132).

9. The top cover structure of a power battery as claimed in claim 8, wherein: the top cover structure of the power battery further comprises a connecting piece (8), the connecting piece (8) is located in the height direction (Z) and located between the top cover piece (1) and the plastic part (2) and connected in series between the pole lugs of the pole column (7) and the battery cell (10), at least one of the pole lugs is provided with a notch (81) matched with the pole column (7), and the material of the connecting piece (8) is the same as that of the pole piece of the battery cell (10) electrically connected with the connecting piece (72).

10. A power cell, comprising:

a housing (9) provided with an opening (91);

the battery cell (10) is accommodated in the shell (9);

the top cover structure of the power battery as claimed in any one of claims 1 to 9, wherein a top cover sheet (1) is fixed to the opening (91) for enclosing the battery cell (10) in the housing (9), and a filling material (20) is disposed between the top cover sheet (1) and the opening (91).

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