CN215578762U - Cover plate assembly for battery and battery device - Google Patents

Abstract

The utility model provides a cover plate assembly for a battery and a battery device. The battery cover plate assembly includes: a top cover; the conductive structure is arranged on the top cover and comprises a pole for conducting electricity; the first end of the connecting structure is electrically connected with the pole, the second end of the connecting structure is electrically connected with the pole lug of the battery cell, and the second end of the connecting structure is provided with a mounting hole; locking structure, including the retaining member, the retaining member wears to establish on utmost point ear and with mounting hole fixed connection to with utmost point ear locking on connection structure. The technical scheme of the utility model solves the problems that the connecting structure of the cover plate component for the battery in the prior art is easy to generate explosion points, welding leakage or insufficient welding and the like when being welded with the pole lugs in the follow-up process.

Description

Cover plate assembly for battery and battery device

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a cover plate assembly for a battery and a battery device.

Background

With the continuous development of new energy industry, the application of lithium ion batteries is also more and more extensive, for example, lithium ion batteries are generally used in digital products, electric vehicles and energy storage and charging systems. The lithium ion battery consists of a shell, a cover plate component, a battery cell, electrolyte and other auxiliary connecting pieces. The cover plate assembly forms a sealing cavity with the shell to play a role of sealing, namely, moisture and other impurities in the air are prevented from entering the battery, the cover plate assembly is also required to be connected with the battery core, generally, a pole of the cover plate assembly is directly or indirectly connected with a pole lug of the battery core, and therefore a closed conductive path is formed.

In the prior art, the tab and the post are generally connected by a flexible connection structure, and the flexible connection structure generally comprises one or more layers of thin conductive thin plates with different shapes. With the one end of flexible coupling direct with utmost point ear welding, the other end of flexible coupling is direct with utmost point post welding, though can form a closed conductive path like this in that the battery is inside, but the flexible coupling structure is the face-to-face contact with utmost point ear to clearance appears easily between flexible coupling structure and the utmost point ear, direct welding like this appears exploding the some easily or leak welding or rosin joint scheduling problem.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a cover plate assembly for a battery and a battery device, and aims to solve the problems that in the prior art, a connecting structure of the cover plate assembly for the battery is easy to generate explosion points, welding leakage or insufficient welding and the like during subsequent welding with a tab.

In order to achieve the above object, according to one aspect of the present invention, there is provided a cap plate assembly for a battery, including: a top cover; the conductive structure is arranged on the top cover and comprises a pole for conducting electricity; the first end of the connecting structure is electrically connected with the pole, the second end of the connecting structure is electrically connected with the pole lug of the battery cell, and the second end of the connecting structure is provided with a mounting hole; locking structure, including the retaining member, the retaining member wears to establish on utmost point ear and with mounting hole fixed connection to with utmost point ear locking on connection structure.

Furthermore, the connecting structure comprises a first connecting piece and a second connecting piece which are connected, an included angle is formed between the first connecting piece and the second connecting piece, the first connecting piece forms a first end, and the second connecting piece forms a second end.

Further, the first connecting piece and the second connecting piece both comprise conductive pieces with preset thicknesses.

Further, at least one side of the second connecting piece is provided with a groove for mounting the lug.

Furthermore, the connecting structure further comprises a connecting groove arranged on the first connecting piece, and the connecting groove is located on one side of the first connecting piece, which deviates from the pole.

Furthermore, the locking piece comprises a locking main body and an end cap connected with the locking main body, the diameter of the locking main body is smaller than that of the end cap, a first step surface is arranged between the locking main body and the end cap, and the locking main body is connected with the mounting hole; or the second connecting piece of the connecting structure is connected with the pole lug in a welding mode.

Furthermore, the locking structure further comprises a clamping plate, a first assembling through hole corresponding to the mounting hole is formed in the clamping plate, and part of the locking part penetrates through the first assembling through hole and the lug and then is riveted or connected with the mounting hole in a threaded mode.

Further, the first assembling through hole comprises a first hole section and a second hole section which are communicated, the diameter of the first hole section is smaller than that of the second hole section, a second step surface is arranged between the first hole section and the second hole section, and the first step surface and the second step surface of the locking piece are abutted.

Furthermore, a first mounting through hole is formed in the top cover, the pole comprises a substrate and a column body arranged on the substrate, at least part of the column body is located in the first mounting through hole, and the substrate is fixedly connected with a first connecting piece of the connecting structure.

Further, the battery cover plate assembly further includes a sealing member located between the inner wall surface of the first mounting through hole and the circumferential side wall of the cylinder.

Furthermore, the cover plate assembly for the battery further comprises a partition plate connected with the top cover, the partition plate is located between the top cover and the base plate, and a second installation through hole which corresponds to the first installation through hole and is used for the column to penetrate out is formed in the partition plate.

Further, the conductive structure further includes: the third connecting piece is connected with the top cover and is provided with a third mounting through hole corresponding to the first mounting through hole; the pole plate is connected with the third connecting piece, the third connecting piece is located between the top cover and the pole plate, a fourth mounting through hole corresponding to the first mounting through hole is formed in the pole plate, and the cylinder sequentially penetrates through the second mounting through hole, the first mounting through hole and the third mounting through hole and then is connected with the inner wall face of the fourth mounting through hole.

Furthermore, a positioning bulge is arranged on one side of the third connecting piece facing the polar plate, a positioning hole is arranged on the polar plate, and the positioning hole is matched with the positioning bulge; or, one side of the third connecting piece facing the top cover is provided with a positioning bulge, the top cover is provided with a positioning hole, and the positioning hole is matched with the positioning bulge.

According to another aspect of the utility model, the utility model provides a battery device, which comprises a battery core and the above-mentioned cover plate assembly for a battery, wherein the battery core is connected with the battery core, the battery core comprises a winding core and a tab connected with the winding core, and the tab is connected with the pole through a connecting structure and a locking structure.

Furthermore, the battery device comprises two battery cells, grooves are arranged on two opposite sides of a second connecting piece of the connecting structure, the two grooves are arranged corresponding to the two battery cells, and the lugs of the battery cells are connected with the second connecting piece through a locking structure; or the pole lug is provided with a second assembling through hole corresponding to the mounting hole, and the locking piece penetrates through the second assembling through hole and then is connected with the mounting hole.

Further, the battery device also comprises a shell connected with the top cover so as to encapsulate the battery core, the connecting structure and the locking structure in the shell.

Further, battery device still includes the protective cradle who is connected with the baffle of apron subassembly for the battery, and the protective cradle is located the casing, and the protective cradle includes the support body and is used for holding the chamber that holds of electric core, and is equipped with a plurality of louvres that are ranks and arrange and with hold the chamber intercommunication on the support body.

By applying the technical scheme of the utility model, the connecting structure and the locking structure are arranged, the first end of the connecting structure is connected with the pole post, and the second end of the connecting structure is connected with the pole lug of the battery cell through the locking structure, so that the pole lug of the battery cell can be connected with the pole post of the cover plate assembly for the battery through the connecting structure and the locking structure, the locking structure can enable the connecting structure to be tightly matched with the pole lug, a gap between the connecting structure and the pole lug is avoided, and the problems that the connecting structure is easy to have a spot explosion or welding leakage or insufficient welding and the like during subsequent welding with the pole lug are avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is a schematic structural view illustrating a cap plate assembly for a battery according to an embodiment of the present invention;

fig. 2 is an exploded view schematically illustrating the cap plate assembly for a battery of fig. 1;

fig. 3 is an exploded schematic view showing a battery device according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating a connection structure of a battery cover plate assembly and a battery cell of the battery device of fig. 3;

fig. 5 is a schematic diagram illustrating the assembled battery cell, connection structure and locking structure of the battery device of fig. 3;

fig. 6 is an exploded schematic view showing a connection structure and a locking structure of the battery device of fig. 3; and

fig. 7 shows a perspective view of the connection structure of fig. 6.

Wherein the figures include the following reference numerals:

10. a connecting structure; 11. a first connecting member; 12. a second connecting member; 13. a groove; 14. mounting holes; 15. connecting grooves; 20. An electric core; 21. a winding core; 22. a tab; 23. a second fitting through hole; 30. a locking structure; 31. a locking member; 311. a locking body; 312. an end cap; 32. a splint; 33. a first fitting through-hole; 331. a first bore section; 332. a second bore section; 40. a top cover; 41. a first mounting through hole; 50. a conductive structure; 51. a pole column; 511. a substrate; 512. a cylinder; 52. a third connecting member; 53. a third mounting through hole; 54. a polar plate; 55. a fourth mounting through hole; 56. positioning the projection; 57. positioning holes; 60. a seal member; 70. a partition plate; 72. a second mounting through hole; 80. a housing; 81. a protective bracket; 82. an insulating film.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It should be noted that the new energy automobile industry and energy storage systems have higher and higher requirements on the fast charge rate of the power battery, in practical application, the high-energy-density battery can improve the endurance mileage of the electric vehicle, and the fast charge rate performance of the battery can reduce the charging time, so that the fast charge capacity and the high energy density have very important significance. The high-rate lithium ion battery can reduce the charging time of the new energy automobile, and plays an irreplaceable role in popularization and application of the new energy automobile.

However, the high-rate lithium ion battery has problems of poor heat dissipation capability and poor overcurrent capability. Specifically, the battery can generate a large amount of heat in the process of rapid charging or rapid discharging, and if the heat is not dissipated, the decomposition of electrolyte and an SEI (solid electrolyte interface) in the battery and the chemical reaction of the electrolyte and positive and negative electrodes can be caused, so that the thermal runaway of the lithium ion battery can be generated, the electrochemical performance and the safety performance of the lithium ion battery can be affected, the battery explosion can be seriously caused, and the life safety and the property safety can be harmed. The battery has heavy current through connection structure at quick charge or quick discharge's in-process, if connection structure's overcurrent bearing capacity is not enough, connection structure can take place to become invalid or be fused under high temperature to cause the battery safety problem, cause serious consequence. In view of the above problems, embodiments of the present invention provide a cover plate assembly for a battery and a battery device having a strong heat dissipation capability and a strong current loading capability.

It should be noted that the battery cover plate assembly according to the embodiment of the present invention can improve the current load capacity of the battery and also improve the heat dissipation capacity of the battery.

The cover plate assembly for a battery according to the embodiment of the present invention is a prismatic lithium battery. For example, lithium titanate prismatic aluminum can batteries and lithium iron phosphate prismatic aluminum can batteries.

It should be noted that the connection structure of the cover plate assembly for a battery according to the embodiment of the present invention and the tab are connected by riveting and laser welding, so that the problems of low efficiency and easy damage to the tab 22 of the battery cell 20 in the conventional ultrasonic welding can be avoided, and further, the production efficiency of the battery can be improved, thereby laying a foundation for mass production.

The inventor knows a connection structure for adapting to the use condition of high-rate heavy-current charge and discharge, generally changes a single-layer flexible connection structure into a multi-layer flexible connection structure, reduces the thickness of each layer of flexible connection, increases the number of layers of the flexible connection structure, and thus can increase the over-current bearing capacity to a certain extent, but gaps exist between the layers of the multi-layer flexible connection structure, so that poor welding phenomena such as spot explosion, insufficient welding and the like can occur when the flexible connection structure is respectively welded with a tab and a pole; in addition, the gaps between layers of the multi-layer flexible connection structure also slow down the conduction of electrons, thereby affecting the service performance of the battery and further causing safety problems.

Thus, as shown in fig. 1 and 6, an embodiment of the present invention provides a cap plate assembly for a battery. The cap plate assembly for a battery includes a top cap 40, a conductive structure 50, a connection structure 10, and a locking structure 30. The conductive structure 50 is disposed on the top cover 40, and the conductive structure 50 includes a post 51 for conducting electricity; a first end of the connecting structure 10 is electrically connected with the pole 51, a second end of the connecting structure 10 is electrically connected with the pole ear 22 of the battery cell 20, and a second end of the connecting structure 10 is provided with a mounting hole 14; the locking structure 30 includes a locking member 31, and the locking member 31 is disposed on the tab 22 and fixedly connected to the mounting hole 14 to lock the tab 22 to the connecting structure 10.

Among the above-mentioned technical scheme, through setting up connection structure 10 and locking structure 30, and connection structure 10's first end is connected with utmost point post 51, connection structure 10's second end is connected with utmost point ear 22 of electric core 20 through locking structure 30, can make electric core 20's utmost point ear 22 be connected with utmost point post 51 through connection structure 10 and locking structure 30 like this, and locking structure 30 can make connection structure 10 and utmost point ear 22 closely cooperate, avoid appearing the clearance between connection structure 10 and the utmost point ear 22, thereby avoid connection structure 10 to appear exploding the spot easily or leak welding or rosin joint scheduling problem when follow-up with utmost point ear 22 welding.

Specifically, in the embodiment of the present invention, the locking member 31 passes through the tab 22 and is coupled to the mounting hole 14, so that the tab 22 can be locked to the connection structure 10, thereby allowing current to flow from the tab 22 to the connection structure 10 and then to the pole 51.

Preferably, in the embodiment of the present invention, the mounting hole 14 is punched, but of course, in an alternative embodiment not shown in the drawings, the mounting hole 14 may be a threaded hole.

As shown in fig. 1 and 2, in the embodiment of the present invention, the connection structure 10 includes a first connection member 11 and a second connection member 12 connected to each other, the first connection member 11 and the second connection member 12 have an included angle therebetween, the first connection member 11 forms a first end, and the second connection member 12 forms a second end.

With the above arrangement, the first connection member 11 and the second connection member 12 can constitute an L-shaped connection structure, so that the connection structure 10 can be applied to a square battery. The structure is simple and easy to assemble.

Preferably, in the embodiment of the present invention, the included angle between the first connecting member 11 and the second connecting member 12 is 90 °. Of course, in an alternative embodiment not shown in the drawings, the included angle between the first connecting member 11 and the second connecting member 12 may be other angles as long as the pole 51 and the tab 22 can be connected through the first connecting member 11 and the second connecting member 12.

It should be noted that the battery cover plate assembly according to the embodiment of the present invention is applied to a prismatic battery, and the shape of the connection structure 10 is correspondingly provided in an L-shape. Of course, in alternative embodiments not shown in the drawings, the shape of the connection structure 10 may also be other shapes as long as the pole 51 and the tab 22 can be connected.

Preferably, in the embodiment of the present invention, the first connecting member 11 and the second connecting member 12 are both block-shaped connecting members, so that the cross-sectional area of the connecting structure 10 can be increased, the overcurrent capability of the connecting structure 10 can be increased, and the cover plate assembly for a battery can adapt to the use conditions of high-rate and large-current charging and discharging.

Specifically, in the embodiment of the present invention, after the second connection member 12 is connected to the tab 22 through the locking member 31, the tab 22 may be welded to the second connection member 12, so that at least a portion of the second connection member 12 and the tab 22 are connected through the weld (i.e., at least a portion of the second connection member 12 and the tab 22 may form an integral structure), thereby conducting current from the weld to the pole 51, and further increasing the current carrying capacity of the battery. Further, the tab 22 and the second connecting member 12 are laser welded, so that the contact area between the tab 22 and the second connecting member 12 can be reduced, and at least part of the second connecting member 12 and the tab 22 are connected by a weld (i.e. at least part of the second connecting member 12 and the tab 22 can form an integrated structure), so that the contact resistance between the second connecting member 12 and the tab 22 can be reduced, thereby reducing heat generation in the conductive process and further improving the heat dissipation capacity of the battery.

Preferably, in the embodiment of the present invention, the connection manner between the second connection member 12 and the tab 22 may be riveting, screwing, welding, or the like. This embodiment is preferably riveted and then welded.

Preferably, in the embodiment of the present invention, the welding is performed by laser welding, that is, the tab 22 and the second connection member 12 are welded by using a laser with a certain power.

In the embodiment of the present invention, when the length of the tab 22 after riveting in the left-right direction in fig. 5 is greater than the width of the second connection member 12, the length of the tab 22 needs to be cut to be equal to the width of the second connection member 12, and then laser welding is performed.

Preferably, in an embodiment of the present invention, the connection structure 10 is made of metallic aluminum. Of course, in alternative embodiments, the connecting structure 10 may also be made of a conductive material such as copper. Alternatively, the connection structure 10 connected to the positive post is made of metallic aluminum and the connection structure 10 connected to the negative post is made of metallic copper.

As shown in fig. 7, in the embodiment of the present invention, each of the first connecting member 11 and the second connecting member 12 includes a conductive member having a predetermined thickness.

Among the above-mentioned technical scheme, connection structure 10's first connecting piece 11 is connected with utmost point post 51, connection structure 10's second connecting piece 12 passes through locking structure 30 and is connected with utmost point ear 22, thus, it is connected with utmost point post 51 to make utmost point ear 22 of electric core 20 pass through connection structure 10 and locking structure 30, and first connecting piece 11 and second connecting piece 12 all include the electrically conductive piece that has predetermined thickness, can increase connection structure 10's cross-sectional area like this, with increase connection structure 10's overcurrent capacity, thereby can make and have great overcurrent area between utmost point ear 22 and the utmost point post 51, the current load capacity of battery has been improved like this, thereby the problem that the battery that adopts the flexible connection structure among the prior art exists the current bearing capacity not enough has been solved.

Preferably, in an embodiment of the present invention, the predetermined thickness of the conductive member ranges from 3mm to 15 mm.

As shown in fig. 1, 4 and 6, in the embodiment of the present invention, at least one side of the second connection member 12 is provided with a groove 13 for mounting the tab 22.

With the above arrangement, the tab 22 can be installed in the groove 13, and the locking member 31 locks the tab 22 in the groove 13, so that one side of the tab 22 is tightly attached to the bottom wall of the groove 13, and thus, the current can be better conducted to the second connecting member 12 through the tab 22 and then to the pole post 51.

As shown in fig. 2 and 7, in the embodiment of the present invention, the connection structure 10 further includes a connection groove 15 disposed on the first connection member 11, and the connection groove 15 is located on a side of the first connection member 11 away from the pole 51.

Through the above setting, first connecting piece 11 can weld with utmost point post 51 through spread groove 15, and spread groove 15 is located one side that deviates from utmost point post 51 of first connecting piece 11, can guarantee zonulae occludens between first connecting piece 11 and utmost point post 51 like this to avoid first connecting piece 11 and utmost point post 51 to produce the clearance and influence welded effect, thereby avoid producing the problem of rosin joint or hourglass welding and influence the performance of battery.

As shown in fig. 5 and 6, in the embodiment of the present invention, the locking structure 30 further includes a clamping plate 32, the clamping plate 32 is provided with a first fitting through-hole 33 corresponding to the mounting hole 14, and a portion of the locking member 31 passes through the first fitting through-hole 33 and the tab 22 and is then riveted or screwed to the mounting hole 14.

In the above technical solution, by providing the clamping plate 32, the tab 22 can be pressed against the second connecting member 12, and the clamping plate 32 covers the tab 22, so that the force of the locking member 31 on the tab 22 is more uniform, so that the entire tab 22 is brought into close contact with the second connection member 12, on one hand, it is possible to prevent a gap from being generated between the tab 22 and the second connection member 12, thereby avoiding the problems of spot explosion, welding leakage or cold joint and the like easily occurring when the second connecting piece 12 is welded with the pole ear 22 in the subsequent process, on the other hand, this can increase the contact area between the tab 22 and the second connection member 12, prevent a gap from being generated between the tab 22 and the second connection member 12, therefore, the current can be better circulated, the current bearing capacity of the battery can be improved, the charging and discharging of the high-rate battery can be facilitated, and the cover plate assembly for the battery is suitable for the high-rate lithium ion battery.

Specifically, in the embodiment of the present invention, at least one side of the second connecting member 12 is provided with a groove 13, and the locking structure 30 includes at least one clamping plate 32, and the clamping plate 32 is disposed corresponding to the groove 13.

Preferably, in the embodiment of the present invention, the first fitting through hole 33 is a punched hole.

As shown in fig. 6, in the embodiment of the present invention, the locker 31 includes a locker body 311 and an end cap 312 coupled to the locker body 311, the locker body 311 has a diameter smaller than that of the end cap 312, and a first step surface is formed between the locker body 311 and the end cap 312, and the locker body 311 is coupled to the mounting hole 14.

Through the above arrangement, the locking main body 311 can be connected with the mounting hole 14 of the second connecting piece 12, and the end cap 312 abuts against a part of the clamping plate 32, so that the tab 22 can be compressed between the clamping plate 32 and the second connecting piece 12 through the clamping plate 32, so as to increase the contact area between the tab 22 and the second connecting piece 12, and avoid generating a gap between the tab 22 and the second connecting piece 12, thereby avoiding the problems of explosion points or welding leakage or cold welding and the like easily occurring when the second connecting piece 12 is welded with the tab 22 at subsequent times, further, current can be better circulated, and the current carrying capacity of the battery is increased.

Preferably, in the embodiment of the present invention, the locker 31 is a rivet. Of course, in an alternative embodiment not shown in the drawings, the locking member 31 may be a fixing member such as a screw or a pin, etc. which can conduct electricity, as long as the locking member 31 can be fitted into the mounting hole 14 and lock the tab 22 and the clamping plate 32 to the second connecting member 12.

Preferably, in the embodiment of the present invention, the locking structure 30 includes at least one set of locking members 31, and the number of sets of locking members 31 is provided corresponding to the number of tabs 22. Wherein, a set of locking members 31 may include a plurality of locking members 31, and a plurality of locking members 31 are disposed corresponding to the plurality of mounting holes 14.

Specifically, in the embodiment of the present invention, the second connection member 12 of the connection structure 10 is connected to the tab 22 by welding after being connected to the locking structure 30.

As shown in fig. 6, in the embodiment of the present invention, the first fitting through hole 33 includes a first hole section 331 and a second hole section 332 which are communicated with each other, a diameter of the first hole section 331 is smaller than a diameter of the second hole section 332, a second step surface is provided between the first hole section 331 and the second hole section 332, and the first step surface and the second step surface of the locking member 31 abut.

With the above arrangement, the locking body 311 is coupled to the mounting hole 14 after passing through the second hole section 332, the first hole section 331 and the tab 22, at least a portion of the end cap 312 is located in the second hole section 332, and the first step surface abuts against the second step surface, so that the locking member 31 can lock the clamping plate 32 and the tab 22 to the second connecting member 12.

As shown in fig. 2, in the embodiment of the present invention, the top cover 40 is provided with a first mounting through hole 41, the pole 51 includes a base 511 and a column 512 disposed on the base 511, at least a portion of the column 512 is located in the first mounting through hole 41, and the base 511 is fixedly connected to the first connecting member 11 of the connecting structure 10.

In the above technical solution, the substrate 511 is arranged to increase the contact area between the terminal post 51 and the first connecting part 11, and the substrate 511 and the first connecting part 11 are more conveniently welded, so that the overcurrent capacity between the connecting structure 10 and the terminal post 51 can be further increased.

Preferably, in the embodiment of the present invention, the pole 51 includes a positive pole and a negative pole. Preferably, the top cover 40 is provided with two first mounting through holes 41 corresponding to the positive and negative poles.

Preferably, in an embodiment of the present invention, both the positive electrode tab and the negative electrode tab are made of an aluminum material. Of course, in alternative embodiments, the positive and negative posts may be made of other conductive materials.

As shown in fig. 2, in the embodiment of the present invention, the battery cover plate assembly further includes a sealing member 60, and the sealing member 60 is located between the inner wall surface of the first mounting through hole 41 and the circumferential side wall of the column 512.

Through the above arrangement, the sealing member 60 can seal the gap between the terminal post 51 and the first mounting through hole 41, so that the leakage of the electrolyte inside the battery can be avoided on the one hand, and the moisture and impurities in the air can be also avoided from entering the inside of the battery on the other hand.

Preferably, in the embodiment of the present invention, the cover plate assembly for a battery includes two sealing members 60 disposed corresponding to the positive and negative electrode posts.

Preferably, in the embodiment of the present invention, the sealing member 60 is made of a fluororubber material.

As shown in fig. 1 and 2, in the embodiment of the utility model, the battery cover plate assembly further includes a partition plate 70 connected to the top cover 40, the partition plate 70 is located between the top cover 40 and the base plate 511, and the partition plate 70 is provided with a second mounting through hole 72 corresponding to the first mounting through hole 41 and used for allowing the column 512 to pass through.

Through the above arrangement, the top cover 40 and the substrate 511 can be separated by the partition board 70, so that the substrate 511 can be prevented from directly contacting the top cover 40, thereby playing an insulating role and further avoiding the top cover 40 from electrically communicating the positive and negative electrode posts.

As shown in fig. 2, in an embodiment of the present invention, the conductive structure 50 further includes a third connector 52 and a plate 54. The third connecting piece 52 is connected with the top cover 40, and a third mounting through hole 53 corresponding to the first mounting through hole 41 is arranged on the third connecting piece 52; the pole plate 54 is connected with the third connector 52, the third connector 52 is located between the top cover 40 and the pole plate 54, a fourth mounting through hole 55 corresponding to the first mounting through hole 41 is formed in the pole plate 54, and the column 512 sequentially penetrates through the second mounting through hole 72, the first mounting through hole 41 and the third mounting through hole 53 and then is connected with the inner wall surface of the fourth mounting through hole 55.

In the above technical solution, the electrode plate 54 may be connected to a power supply or an electric device, so that the battery can be charged and discharged.

Specifically, in the embodiment of the present invention, the conductive structure 50 includes the positive and negative electrode plates disposed corresponding to the positive and negative posts and the two third connection members 52, such that the two third connection members 52 can separate the two electrode plates 54 from the top cap 40, and such that the positive and negative electrode plates can be prevented from being electrically communicated through the top cap 40.

Preferably, in an embodiment of the present invention, both the positive and negative electrode plates are made of an aluminum material. Of course, in alternative embodiments, the positive and negative plates may be made of other conductive materials.

Preferably, in the embodiment of the present invention, the third connecting member 52 corresponding to the positive plate is made of an insulating material, preferably one of PP (polypropylene), PPs (polyphenylene sulfide), abs (acrylonitrile Butadiene styrene), and PET (polyester resin); the third connection member 52 corresponding to the negative electrode plate is made of a conductive material, preferably a stainless steel material.

Preferably, in the embodiment of the present invention, the third connecting member 52 corresponding to the positive plate is in the structure of a connecting block, so that the creepage distance can be increased.

As shown in fig. 2, in the embodiment of the present invention, a positioning protrusion 56 is disposed on a side of the third connecting member 52 facing the plate 54, a positioning hole 57 is disposed on the plate 54, and the positioning hole 57 is engaged with the positioning protrusion 56.

Through the above arrangement, the pole plate 54 can be accurately assembled to the third connector 52, so that the third mounting through hole 53 of the third connector 52 and the fourth mounting through hole 55 of the pole plate 54 can be ensured to be coaxially arranged, and the column 512 can be better connected with the fourth mounting through hole 55 after passing through the third mounting through hole 53.

As shown in fig. 2, in the embodiment of the present invention, a positioning protrusion 56 is provided on a side of the third connecting member 52 facing the top cover 40, a positioning hole 57 is provided on the top cover 40, and the positioning hole 57 is engaged with the positioning protrusion 56.

Through the above arrangement, the third connecting member 52 can be accurately assembled to the top cover 40, so that the third mounting through hole 53 of the third connecting member 52 and the first mounting through hole 41 of the top cover 40 can be ensured to be coaxially arranged, and the column 512 can better pass through the first mounting through hole 41 and then pass through the third mounting through hole 53.

As shown in fig. 3, an embodiment of the present invention provides a battery device. The battery device comprises a battery cell 20 and the cover plate assembly for the battery connected with the battery cell 20, wherein the battery cell 20 comprises a winding core 21 and a tab 22 connected with the winding core 21, and the tab 22 is connected with a pole 51 through a connecting structure 10 and a locking structure 30. The battery device has all the advantages of the battery cover plate component, and the description is omitted here.

As shown in fig. 5, in the embodiment of the present invention, the battery cell 20 includes two tabs 22 connected to the winding core 21, and the cover plate assembly for a battery includes two connecting structures 10, and each tab 22 is connected to the corresponding second connecting member 12 through a locking structure 30.

With the above arrangement, the locking structure 30 and the connecting structure 10 of one battery cover plate assembly can connect one tab (e.g., a positive tab) with one terminal 51 (e.g., a positive terminal), and the locking structure 30 and the connecting structure 10 of the other battery cover plate assembly can connect the other tab (e.g., a negative tab) with the other terminal (e.g., a negative terminal), so as to form a conductive path.

Preferably, in the embodiment of the present invention, the battery cell 20 is a winding battery cell, and the material of the battery cell is ternary lithium or lithium titanate.

As shown in fig. 3, 5 and 6, in the embodiment of the present invention, the battery device includes two battery cells 20, two opposite sides of the second connecting member 12 of the connecting structure 10 are respectively provided with a groove 13, the two grooves 13 are disposed corresponding to the two battery cells 20, and the tab 22 of the battery cell 20 is connected to the second connecting member 12 through the locking structure 30.

Through the above arrangement, one connection structure 10 can connect the tabs 22 of the two battery cells 20 with the same polarity, so that the two battery cells 20 can be arranged in parallel, and thus, the internal resistance of the battery device can be reduced to 50% of the original internal resistance, so that the battery device has less heat generation when the battery device has the same electric quantity, and the improvement of the electrochemical performance of the battery device is facilitated.

Specifically, as shown in fig. 3, in the embodiment of the present invention, the tab 22 is provided with a second assembling through hole 23 corresponding to the mounting hole 14, and the locking member 31 is connected to the mounting hole 14 after passing through the second assembling through hole 23.

Preferably, in the embodiment of the present invention, the second fitting through hole 23 is a punched hole, which can be prepared for subsequent riveting with the connection structure 10.

Preferably, in the embodiment of the present invention, the tab 22 may be shaped by a punch during the process of assembling the tab 22 to the connection structure 10, so that the surface of the tab 22 is more flat, and thus the tab 22 is better brought into contact with the connection structure 10.

Preferably, in the embodiment of the present invention, the first fitting through hole 33, the second fitting through hole 23, and the mounting hole 14 are coaxially disposed.

As shown in fig. 3, in the embodiment of the present invention, the battery device further includes a housing 80 connected to the top cover 40, so as to enclose the battery cell 20, the connecting structure 10 and the locking structure 30 in the housing 80.

Through the arrangement, the electrolyte in the battery device can be prevented from leaking outside or moisture and impurities in the air can be prevented from entering the battery.

Preferably, in the embodiment of the present invention, since the density of aluminum is small and the welding performance is excellent, the case 80 is made of aluminum. Of course, in alternative embodiments, the housing 80 may be made of other metallic materials.

As shown in fig. 3, in the embodiment of the present invention, the battery device further includes a protection bracket 81 connected to the partition plate 70 of the cover plate assembly for the battery, the protection bracket 81 is located in the casing 80, and the protection bracket 81 includes a bracket body and a receiving cavity for receiving the battery cell 20, and the bracket body is provided with a plurality of heat dissipation holes arranged in rows and columns and communicated with the receiving cavity.

Among the above-mentioned technical scheme, be connected protection support 81 and baffle 70, can avoid electric core 20 and the part battery that is connected with electric core 20 to rock in casing 80 with the apron subassembly, further, set up a plurality of louvres that are ranks and arrange on protection support 81, so both can strengthen the heat-sinking capability of battery, alleviateed protection support 81's weight again, be favorable to promoting battery device's energy density.

Specifically, in the embodiment of the present invention, the protection bracket 81 may support, protect and insulate the battery cell. Preferably, the protective bracket 81 may be made of any one of materials that are resistant to electrolyte corrosion, have excellent insulation, excellent dielectric properties, high temperature resistance, and good flame retardancy, such as PPs (polyphenylene sulfide), abs (acrylonitrile Butadiene styrene), PP (polypropylene), PET (polyester resin), and pfa (polyfluoroalkoxy).

Preferably, in the embodiment of the present invention, the protection bracket 81 is made of PP material added with a certain flame retardant.

Preferably, in the embodiment of the present invention, the protection bracket 81 adopts a U-shaped structure, so as to envelop the battery cell 20, the connection structure 10 and the locking structure 30.

As shown in fig. 3, in the embodiment of the present invention, the top cover 40 is further provided with an explosion-proof hole, and the cover plate assembly for a battery further includes an explosion-proof valve, which is located in the explosion-proof hole.

Through the arrangement, the explosion-proof valve can be used for air pressure safety protection. If the battery device expands when in use, and the air pressure value in the battery device is larger than the bearable pressure of the explosion-proof valve during explosion, the explosion-proof valve can explode, thereby preventing the explosion of the battery device caused by overlarge internal air pressure.

Preferably, in the embodiment of the utility model, the explosion-proof valve is made of aluminum, so that laser welding is facilitated.

In the embodiment of the present invention, as shown in fig. 3, the top cover 40 is further provided with a liquid injection hole, and the battery cover plate assembly further includes a sealing nail, at least a portion of which is located in the liquid injection hole.

Through the arrangement, after the liquid injection is completed, the sealing nail can be utilized to seal the liquid injection nozzle.

In the embodiment of the present invention, the sealing nail may be made of PP, PPs, ABS, PET, or the like.

Preferably, in the embodiment of the present invention, the battery device further includes an insulating film 82 wrapped around the outer side of the protection bracket 81 to function as an insulator. The insulating film 82 is preferably a mylar film.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: through setting up connection structure and locking structure to connection structure's first end is connected with utmost point post, and connection structure's second end is connected through the utmost point ear of locking structure and electric core, can make the utmost point ear of electric core pass through connection structure and locking structure and be connected with the battery with the utmost point post of apron subassembly like this, and locking structure can make connection structure and utmost point ear closely cooperate, avoids appearing the clearance between connection structure and the utmost point ear, thereby avoids connection structure to appear exploding the some easily or leak welding or rosin joint scheduling problem when follow-up with utmost point ear welding.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (17)

1. A cover plate assembly for a battery, comprising:

a top cover (40);

the conductive structure (50) is arranged on the top cover (40), and the conductive structure (50) comprises a pole (51) for conducting electricity;

the first end of the connecting structure (10) is electrically connected with the pole (51), the second end of the connecting structure (10) is electrically connected with the pole lug (22) of the battery cell (20), and the second end of the connecting structure (10) is provided with a mounting hole (14);

locking structure (30), including retaining member (31), retaining member (31) wear to establish on utmost point ear (22) and with mounting hole (14) fixed connection, with will utmost point ear (22) lock is in on connection structure (10).

2. The battery cover plate assembly according to claim 1, wherein the connecting structure (10) comprises a first connecting member (11) and a second connecting member (12) connected, the first connecting member (11) and the second connecting member (12) having an included angle therebetween, the first connecting member (11) forming the first end, the second connecting member (12) forming the second end.

3. The battery cap plate assembly according to claim 2, wherein the first connecting member (11) and the second connecting member (12) each comprise a conductive member having a predetermined thickness.

4. The battery cover plate assembly according to claim 2, wherein at least one side of the second connecting member (12) is provided with a groove (13) for mounting the tab (22).

5. The cover plate assembly for a battery according to claim 2, wherein the connecting structure (10) further comprises a connecting groove (15) provided to the first connecting member (11), the connecting groove (15) being located on a side of the first connecting member (11) facing away from the pole (51).

6. The cover plate assembly for a battery according to any one of claims 1 to 5, wherein the locker (31) comprises a locker body (311) and an end cap (312) connected to the locker body (311), the locker body (311) having a diameter smaller than that of the end cap (312) with a first step surface between the locker body (311) and the end cap (312), the locker body (311) being connected to the mounting hole (14); or the second connecting piece (12) of the connecting structure (10) is connected with the pole lug (22) in a welding mode.

7. The battery cover plate assembly according to any one of claims 1 to 5, wherein the locking structure (30) further comprises a clamping plate (32), the clamping plate (32) is provided with a first assembling through hole (33) corresponding to the mounting hole (14), and a part of the locking member (31) passes through the first assembling through hole (33) and the tab (22) and then is riveted or screwed with the mounting hole (14).

8. The battery cover plate assembly according to claim 7, wherein the first fitting through-hole (33) includes a first hole section (331) and a second hole section (332) communicating with each other, the first hole section (331) has a diameter smaller than that of the second hole section (332), a second step surface is provided between the first hole section (331) and the second hole section (332), and the first step surface of the locker (31) abuts against the second step surface.

9. The cover plate assembly for the battery according to any one of claims 1 to 5, wherein a first mounting through hole (41) is formed in the top cover (40), the pole (51) comprises a base plate (511) and a column body (512) arranged on the base plate (511), at least a portion of the column body (512) is located in the first mounting through hole (41), and the base plate (511) is fixedly connected with the first connecting piece (11) of the connecting structure (10).

10. The battery-dedicated lid assembly according to claim 9, further comprising a seal member (60), the seal member (60) being located between an inner wall surface of the first mounting through-hole (41) and a circumferential side wall of the cylinder (512).

11. The battery cover plate assembly according to claim 9, further comprising a partition plate (70) connected to the top cover (40), wherein the partition plate (70) is located between the top cover (40) and the base plate (511), and the partition plate (70) is provided with a second mounting through hole (72) corresponding to the first mounting through hole (41) for the through-penetration of the column (512).

12. The battery cover plate assembly according to claim 11, wherein the conductive structure (50) further comprises:

the third connecting piece (52) is connected with the top cover (40), and a third mounting through hole (53) corresponding to the first mounting through hole (41) is formed in the third connecting piece (52);

the pole plate (54) is connected with the third connecting piece (52), the third connecting piece (52) is located between the top cover (40) and the pole plate (54), a fourth mounting through hole (55) corresponding to the first mounting through hole (41) is formed in the pole plate (54), and the cylinder (512) sequentially penetrates through the second mounting through hole (72), the first mounting through hole (41) and the third mounting through hole (53) and then is connected with the inner wall surface of the fourth mounting through hole (55).

13. The battery cover plate assembly according to claim 12, wherein a side of the third connecting member (52) facing the electrode plate (54) is provided with a positioning protrusion (56), the electrode plate (54) is provided with a positioning hole (57), and the positioning hole (57) is engaged with the positioning protrusion (56); or a positioning bulge (56) is arranged on one side, facing the top cover (40), of the third connecting piece (52), a positioning hole (57) is arranged on the top cover (40), and the positioning hole (57) is matched with the positioning bulge (56).

14. A battery device, comprising a battery core (20) and the cover plate assembly of any one of claims 1 to 13 connected to the battery core (20), wherein the battery core (20) comprises a winding core (21) and a tab (22) connected to the winding core (21), and the tab (22) is connected to the terminal (51) through the connecting structure (10) and the locking structure (30).

15. The battery device according to claim 14, wherein the battery device comprises two battery cells (20), two grooves (13) are formed on two opposite sides of the second connecting member (12) of the connecting structure (10), the two grooves (13) are arranged corresponding to the two battery cells (20), and the tabs (22) of the battery cells (20) are connected with the second connecting member (12) through the locking structure (30); or the pole lug (22) is provided with a second assembling through hole (23) corresponding to the mounting hole (14), and the locking piece (31) penetrates through the second assembling through hole (23) and then is connected with the mounting hole (14).

16. The battery device according to claim 14, further comprising a housing (80) connected to the top cover (40) to enclose the battery cell (20), the connecting structure (10), and the locking structure (30) within the housing (80).

17. The battery device according to claim 16, further comprising a protective bracket (81) connected to the partition (70) of the cover plate assembly for the battery, wherein the protective bracket (81) is located in the housing (80), the protective bracket (81) comprises a bracket body and a receiving cavity for receiving the battery cell (20), and the bracket body is provided with a plurality of heat dissipation holes arranged in rows and columns and communicated with the receiving cavity.

Images