Patent Description:
The invention relates to the technical field of lithium batteries, and in particular to a cover plate assembly for a battery and a battery device.

With the new energy industry developing continuously, the lithium ion batteries are applied increasingly widespread. For example, the lithium ion batteries are generally used in digital products, electric vehicles, and energy storage charge systems. The lithium ion battery consists of a case, a cover plate assembly, cells, an electrolyte, and other auxiliary connectors. In addition to forming a sealing cavity with the case for sealing, that is, preventing moisture and other impurities in an air from entering the battery, the cover plate assembly is also required to be connected to the cells. Generally, the poles of the cover plate assembly are directly or indirectly connected to the tabs of the cells, to form a closed conductive path.

In an art known to the inventors, the tabs and the poles are generally connected through soft connection structures. The soft connection structures generally consist of one or more layers of thin conductive sheets in different shapes. One ends of the soft connection structures are directly welded to the tabs, and the other ends of the soft connection structures are directly welded to the poles. Although one closed conductive path is formed in the battery, the soft connection structures are in surface-to-surface contact with the tabs. The gaps are likely to be caused between the soft connection structures and the tabs, so that after direct welding, the explosion points, the missing welding, the incomplete welding, etc are likely to be caused.

A large-capacity secondary battery is provided in D1(<CIT>).

An energy storage cell, production method and apparatus for carrying out the method is provided in D2 (<CIT>).

Some embodiments of the invention provide a battery device comprising a cover plate assembly to solve the problems that when connection structures of a cover plate assembly for a battery in the prior art are welded to tabs subsequently, explosion points, missing welding, incomplete welding, etc. are likely to be caused. To realize the objective described above, in one embodiment of the invention, provided is a battery device, comprising a cell and a cover plate assembly for the battery connected with the cell, wherein the cell comprises roll cores and tabs connected with the roll cores, wherein the cover plate assembly for the battery, includes a top cover;
a conductive structure arranged on the top cover, the conductive structure including at least one pole for conducting electricity; at least one connection structure, a first end of each connection structure being electrically connected with a corresponding pole in the at least one pole, a second end of the connection structure being electrically connected with a tab of a cell, and the second end of the each connection structure being provided with an installation hole; and a locking structure including at least one locking member, each locking member penetrating the tab to be fixedly connected to the installation hole, to lock the tab on the connection structure correspondingly, the tabs being connected with the poles through connection structures and the locking structure.

In the invention, the each connection structure includes a first connector and a second connector connected to each other, an included angle being provided between the first connector and the second connector, the first connector forming the first end, and the second connector forming the second end.

In some embodiments, the first connector and the second connector each include conductive members having predetermined thicknesses.

In the invention, at least one side of the second connector is provided with a groove for installing the tab.

In some embodiments, the each connection structure further includes a connection groove arranged on the first connector, the connection groove being positioned on a side, away from the pole, of the first connector.

In some embodiments, the each locking member includes a locking body and an end cap connected with the locking body, the locking body having a diameter smaller than the end cap, a first step surface being provided between the locking body and the end cap, and the locking body being connected with the installation hole; or, the second connector of the connection structure is welded to the tab.

In some embodiments, the locking structure further includes a clamping plate, the clamping plate being provided with a first assembly through hole corresponding to the installation hole, and a part of the each locking member penetrating the first assembly through hole and the tab to be riveted or connected through threads to the installation hole.

In some embodiments, the first assembly through hole includes a first hole section and a second hole section communicating with each other, the first hole section having a diameter smaller than the second hole section, a second step surface being provided between the first hole section and the second hole section, and a first step surface of a corresponding locking member in the locking members abutting against the second step surface.

In some embodiments, the top cover is provided with at least one first installation through hole, and each pole includes a base plate and a pole body arranged on the base plate, at least portion of the pole body being positioned in the first installation through hole, and the base plate being fixedly connected with a first connector of a corresponding connection structure in the at least one connection structure.

In some embodiments, the cover plate assembly for the battery further includes sealing members, the sealing members being positioned between inner wall surfaces of the first installation through holes and circumferential side walls of the pole bodies.

In some embodiments, the cover plate assembly for the battery further includes a separation plate connected with the top cover, the separation plate being positioned between the top cover and the base plates, and the separation plate being provided with second installation through holes corresponding to the first installation through holes for the pole bodies to penetrate.

In some embodiments, the conductive structures further include third connectors connected to the top cover, the third connectors being provided with third installation through holes corresponding to the first installation through holes; and plates connected to the third connectors, the third connectors being positioned between the top cover and the plates, the plates being provided with fourth installation through holes corresponding to the first installation through holes, and the pole bodies penetrating the second installation through holes, the first installation through holes, and the third installation through holes in sequence to be connected to inner wall surfaces of the fourth installation through holes.

In some embodiments, positioning protrusions are provided on one sides, facing the plates, of the third connectors, and the plates are provided with positioning holes, the positioning holes matching the positioning protrusions; alternatively, positioning protrusions are provided on one sides, facing the top cover, of the third connectors, and the top cover is provided with positioning holes, the positioning holes matching the positioning protrusions.

In some embodiments, the battery device includes two cells, and two sides, opposite each other, of the second connectors of the connection structures are each provided with grooves, the two grooves being arranged corresponding to the two cells, and the tabs of the cells being connected to the second connectors through the locking structures; alternatively, the tabs are provided with second assembly through holes corresponding to installation holes, the locking members penetrating the second assembly through holes to be connected to the installation holes.

In some embodiments, the battery device further includes a case connected with a top cover, the case being configured to encapsulate the cell, the connection structure, and the locking structure in the case.

In some embodiments, the battery device further includes a protective bracket connected with a separation plate of the cover plate assembly for the battery, the protective bracket being positioned in the case, the protective bracket including a bracket body and an accommodation cavity for accommodating the cell, and the bracket body being provided with a plurality of heat dissipation holes arranged in rows and columns and communicating with the accommodation cavity.

With the technical solution to the invention applied, the connection structure and the locking structure are arranged, the first end of the connection structure is connected with the pole, and the second end of the connection structure is connected with the tab of the cell through the locking structure, so that the tab of the cell is connected with the pole of the cover plate assembly for the battery through the connection structure and the locking structure, and the locking structure may enable the connection structure to be in close fit with the tab, to avoid a gap between the connection structure and the tab, thereby avoiding the problems that when the connection structures are welded to the tabs subsequently, explosion points, missing welding, incomplete welding, etc. are likely to be caused.

The drawings of the description, which form a part of the invention, are used to provide further understanding of the invention, and the schematic embodiments of the invention and the description thereof are used to explain the invention, which are not intended to unduly limit the invention. In the accompanying drawings:.

In the figures, the accompanying drawings include the following reference numerals:
<NUM>. connection structure; <NUM>. first connector; <NUM>. second connector; <NUM>. groove; <NUM>. installation hole; <NUM>. connection groove; <NUM>. cell; <NUM>. roll core; <NUM>. tab; <NUM>. second assembly through hole; <NUM>. locking structure; <NUM>. locking member; <NUM>. locking body; <NUM>. end cap; <NUM>. clamping plate; <NUM>. first assembly through hole; <NUM>. first hole section; <NUM>. second hole section; <NUM>. top cover; <NUM>. first installation through hole; <NUM>. conductive structure; <NUM>. pole; <NUM>. base plate; <NUM>. pole body; <NUM>. third connector; <NUM>. third installation through hole; <NUM>. plate; <NUM>. fourth installation through hole; <NUM>. positioning protrusion; <NUM>. positioning hole; <NUM>. sealing member; <NUM>. separation plate; <NUM>. second installation through hole; <NUM>. case; <NUM>. protective bracket; and <NUM>. insulation film.

It should be noted that the embodiments in the invention and features in the embodiments may be combined with one another without conflict. The invention is described in detail below with reference to the accompanying drawings and the embodiments.

It should be noted that a new energy vehicle industry and an energy storage system have increasingly higher requirements on a rapid charge rate of a power battery. In practical application, a high energy density battery may extend an endurance mileage of an electric vehicle, while rapid charge rate performance of the battery may shorten a charge time. Therefore, it is of great importance to provide a rapid charge capacity and high energy density. With a capacity to shorten a charge time of a new energy vehicle, a high-rate lithium ion battery plays an irreplaceable role in promotion and application of the new energy vehicle.

However, the high-rate lithium ion battery features a poor heat dissipation capacity and a poor overcurrent capacity. Specifically, the battery is expected to generate a large amount of heat in a process of rapid charge or discharge. If the heat is not dissipated, an electrolyte and a solid electrolyte interface (SEI) film in the battery are decomposed, and positive and negative electrodes and the electrolyte are subjected to chemical reactions, so that thermal runaway of the lithium ion battery is caused, thereby affecting electrochemical performance and safety performance of the battery, and even causing battery explosion, to endanger life and property safety. In the process of rapid charge or discharge of the battery, a large current passes through connection structures. With an insufficient overcurrent bearing capacity, the connection structures fail or are fused at a high temperature, resulting in a safety problem of the battery and serious consequences. In view of the problems described above, an embodiment of the invention provides a cover plate assembly for a battery having a high heat dissipation capacity and a high current load capacity, and a battery device.

It should be noted that the cover plate assembly for the battery in the embodiment of the invention may improve a current load capacity and a heat dissipation capacity of the battery.

It should be noted that the cover plate assembly for the battery is suitable for prismatic lithium batteries, such as a lithium titanate prismatic aluminum case battery and a lithium iron phosphate prismatic aluminum case battery.

It should be noted that connection structures and tabs of the cover plate assembly for the battery in the embodiment of the invention are riveted and then subjected to laser welding, to avoid a low efficiency of an ultrasonic welding known to inventors and a tendency to damage the tabs <NUM> of a cell <NUM>, and further to improve a production efficiency of the battery, thereby laying a foundation for mass production.

The inventors are aware of a connection structure adaptive to a use working condition of high-rate large-current charge and discharge. Generally, a single-layer soft connection structure is changed into a multi-layer soft connection structure, and a thickness of each layer of soft connection structures is thinned, to increase the number of layers of the soft connection structures, and improve an overcurrent bearing capacity to a certain extent. However, gaps are generated between the layers of the multi-layer soft connection structure. Therefore, when the connection structures are welded to tabs and poles, respectively, poor welding phenomena of explosion points, incomplete welding, etc. are caused. In addition, the gaps between the layers of the multi-layer soft connection structure also slow down conduction of electrons, so that service performance of the battery is affected, thereby causing a safety problem.

Therefore, as shown in <FIG> and <FIG>, an embodiment of the invention provides a cover plate assembly for a battery. The cover plate assembly for the battery includes a top cover <NUM>, conductive structures <NUM>, connection structures <NUM>, and locking structures <NUM>, the conductive structures <NUM> are arranged on the top cover <NUM>, each conductive structure <NUM> includes a pole <NUM> for conducting electricity, first ends of the connection structures <NUM> are electrically connected to the poles <NUM>, second ends of the connection structures <NUM> are electrically connected to tabs <NUM> of cells <NUM>, the second ends of the connection structures <NUM> are provided with installation holes <NUM>, and the locking structures <NUM> include locking members <NUM>, the locking members <NUM> penetrating the tabs <NUM> are fixedly connected to the installation holes <NUM>, to lock the tabs <NUM> on the connection structures <NUM>.

In the technical solution described above, the connection structures <NUM> and the locking structures <NUM> are arranged, the first end of each connection structure <NUM> is connected with a pole <NUM> in the poles <NUM>, and the second end of the each connection structure <NUM> is connected with the tabs <NUM> of the cells <NUM> through the locking structure <NUM>, so that the tabs <NUM> of the cells <NUM> are connected with the poles <NUM> through the connection structures <NUM> and the locking structures <NUM>, and the locking structures <NUM> enable the connection structures <NUM> to be in close fit with the tabs <NUM>, to avoid gaps between the connection structures <NUM> and the tabs <NUM>, thereby avoiding the problems that when the connection structures <NUM> are welded to the tabs <NUM> subsequently, explosion points, missing welding, incomplete welding, etc. are likely to be caused.

Specifically, in the embodiment of the invention, each locking member <NUM> penetrates at least one tab <NUM> and is connected to the corresponding installation hole <NUM>, to lock the at least one tab <NUM> on the connection structure <NUM>, so that a current is able to flow from the at least one tab <NUM> to the connection structure <NUM> and then to the corresponding pole <NUM>.

In the embodiment of the invention, each of the installation holes <NUM> is a punched hole. Certainly, in an alternative embodiment not shown in the accompanying drawings, installation holes <NUM> may also be threaded holes.

As shown in <FIG> and <FIG>, in the embodiment of the invention, each of the connection structures <NUM> includes a first connector <NUM> and a second connector <NUM> connected to each other. An included angle is provided between the first connector <NUM> and the second connector <NUM>. The first connector <NUM> form the first end, and the second connector <NUM> form the second ends.

With the arrangement described above, the first connector <NUM> and the second connector <NUM> may constitute an L-shaped connection structure. Therefore, the connection structure <NUM> may be suitable for a prismatic battery. The structures described above are simple and easy to assemble.

In the embodiment of the invention, the included angle between the first connector <NUM> and the second connector <NUM> is <NUM>°. Certainly, in some othe r embodiments not shown in the accompanying drawings, the included angle between first connector <NUM> and second connector <NUM> may be another value, as long as a pole <NUM> and a tab <NUM> may be connected through the first connector <NUM> and the second connector <NUM>.

It should be noted that the cover plate assembly for the battery in the embodiment of the invention is suitable for the prismatic battery, and the connection structures <NUM> are correspondingly set to be L-shaped. Certainly, in the alternative embodiment not shown in the accompanying drawings, connection structures <NUM> may also in another shape, as long as they may connect the poles <NUM> and the tabs <NUM>.

In the embodiment of the invention, both the first connector <NUM> and the second connector <NUM> are block-shaped connectors. Therefore, a cross-sectional area of the connection structure <NUM> is increased, to improve an overcurrent capacity of the connection structure <NUM>, thereby making the cover plate assembly for the battery adapt to the use working condition of the high-rate large-current charge and discharge.

Specifically, in the embodiment of the invention, after the second connector <NUM> is connected with the tab <NUM> through at least one locking member <NUM>, the tab <NUM> may also be welded to the second connector <NUM>, so that at least portion of the second connector <NUM> and the tab <NUM> are connected through weld joints (that is, at least portion of the second connector <NUM> and the tab <NUM> may be formed into an integral structure), to conduct the current from the weld joints to the corresponding pole <NUM>, thereby improving the current bearing capacity of the battery. Further, a contact area between the tab <NUM> and the second connector <NUM> may also be reduced by carrying out laser welding on the tab <NUM> and the second connector <NUM>, so that at least portion of the second connector <NUM> and the tab <NUM> are connected through the weld joints (that is, at least portion of the second connector <NUM> and the tab <NUM> may be formed into the integral structure). Therefore, contact resistance between the second connector <NUM> and the tab <NUM> is reduced, to reduce heat generation in an electricity conduction process, thereby improving the heat dissipation capacity of the battery. In the embodiment of the invention, the second connector <NUM> and the tab <NUM> may be connected through riveting, threads, welding, etc. In the present embodiment, in some embodiments, the second connector and the tab are riveted and then welded.

In the embodiment of the invention, the welding described above is laser welding, that is, the tab <NUM> and the second connector <NUM> is welded through a laser with a certain power.

It should be noted that in the embodiment of the invention, when a length of riveted tab <NUM> in a left-right direction in <FIG> is greater than a width of the second connector <NUM>, it is required to cut the tab <NUM> to length thereof equal to the width of the second connector <NUM>, and then carry out laser welding.

In the embodiment of the invention, each of the connection structures <NUM> is made of metal aluminum. Certainly, in the alternative embodiment, connection structures <NUM> may also be made of conductive materials such as metal copper. In some embodiments, a connection structure <NUM> connected to a positive pole is made of metal aluminum, and a connection structure <NUM> connected to a negative pole is made of metal copper.

As shown in <FIG>, in the embodiment of the invention, the first connector <NUM> and the second connector <NUM> each includes a conductive member having a predetermined thickness.

In the technical solution described above, the first connector <NUM> of the each connection structure <NUM> is connected to the pole <NUM>, and the second connector <NUM> of the connection structure <NUM> is connected to the tabs <NUM> through the locking structure <NUM>, so that the tabs <NUM> of the cell <NUM> may be connected to the pole <NUM> through the connection structure <NUM> and the locking structure <NUM>. The first connector <NUM> and the second connector <NUM> each include the conductive members with the predetermined thicknesses, so that the cross-sectional area of the connection structure <NUM> may be expanded, to improve the overcurrent capacity of the connection structure <NUM>. Large overcurrent area may be provided between the tabs <NUM> and the pole <NUM>, to improve the current bearing capacity of the battery, thereby solving an insufficient current bearing capacity of a battery adopting the soft connection structures in the art known to the inventors.

In the embodiment of the invention, the predetermined thickness of the conductive member ranges from <NUM> to <NUM>.

As shown in <FIG>, <FIG>, and <FIG>, in the embodiment of the invention, at least one side of the second connector <NUM> is provided with a groove <NUM> for installing the tab <NUM>.

With the arrangement described above, the tab <NUM> is installed in the groove <NUM>, and the locking member <NUM> lock the tab <NUM> in the groove <NUM>, so that one side of the tab <NUM> is in close fit with a bottom wall of the groove <NUM>, to better conduct the current to the second connector <NUM> through the tab <NUM> and then to the pole <NUM>.

As shown in <FIG> and <FIG>, in the embodiment of the invention, each of the connection structures <NUM> further includes a connection groove <NUM> arranged on the first connector <NUM>, the connection groove <NUM> is positioned on a sides, away from the pole <NUM>, of the first connector <NUM>.

With the arrangement described above, the first connector <NUM> is welded to the pole <NUM> through the connection groove <NUM>, and the connection groove <NUM> is positioned on a side, away from the pole <NUM>, of the first connector <NUM>, to ensure close connection between the first connector <NUM> and the pole <NUM>, and to avoid a situation that the gap is generated between the first connector <NUM> and the pole <NUM> to affect a welding effect, thereby avoiding affecting the performance of the battery through resulting incomplete welding or missing welding.

As shown in <FIG> and <FIG>, in the embodiment of the invention, the locking structure <NUM> further include a clamping plate <NUM>, the clamping plate <NUM> is provided with a first assembly through hole <NUM> corresponding to the installation hole <NUM>, and a part of the locking member <NUM> penetrates the first assembly through hole <NUM> and the tab <NUM> to be riveted or connected through threaded to the installation hole <NUM>.

In the technical solution described above, the tab <NUM> is pressed against the second connector <NUM> through the clamping plate <NUM>, and the clamping plate <NUM> cover the tab <NUM>, so that more uniform forces are applied by the locking member <NUM> on the tab <NUM>, and an entire tab <NUM> is in close contact with the second connector <NUM>. In one aspect, the gap between the tab <NUM> and the second connector <NUM> is avoided, to avoid the problem that when the second connector <NUM> is welded to the tab <NUM> subsequently, the explosion points, the missing welding, the incomplete welding, etc. are likely to be caused. In another aspect, the contact area between the tab <NUM> and the second connector <NUM> is increased, to avoid the gap between the tab <NUM> and the second connector <NUM>, so that the current may be better circulated, the current bearing capacity of the battery is improved, to facilitate the high-rate battery charge and discharge, thereby making the cover plate assembly for the battery suitable for the high-rate lithium ion battery.

Specifically, in the embodiment of the invention, at least one side of the second connector <NUM> is provided with the groove <NUM>, and the locking structure <NUM> includes at least one clamping plate <NUM>, the at least one clamping plate <NUM> is arranged corresponding to the at least one groove <NUM>.

In the embodiment of the invention, the first assembly through holes <NUM> are punched holes.

As shown in <FIG>, in the embodiment of the invention, the locking member <NUM> includes a locking body <NUM> and an end cap <NUM> connected to the locking body <NUM>, the locking body <NUM> has a diameter smaller than the end cap <NUM>, a first step surface is provided between the locking body <NUM> and the end cap <NUM>, and the locking body <NUM> is connected with the installation hole <NUM>.

With the arrangement described above, the locking body <NUM> is connected to the installation hole <NUM> of the second connector <NUM>, and the end cap <NUM> abuts against a part of the clamping plate <NUM>, so that the tab <NUM> is pressed between the clamping plate <NUM> and the second connector <NUM> through the clamping plate <NUM>, to expand the contact area between the tab <NUM> and the second connector <NUM>, to avoid the gap between the tab <NUM> and the second connector <NUM>, thereby avoiding the problems that when the second connector <NUM> is welded to the tab <NUM> subsequently, the explosion points, the missing welding, the incomplete welding, etc. are likely to be caused, and further to better circulate the current, to improve the current bearing capacity of the battery.

In the embodiment of the invention, the locking member <NUM> is a rivet. Certainly, in some embodiments not shown in the accompanying drawings, locking member <NUM> may also be a conductive fixing member such as a screw or a pin, as long as the locking member <NUM> may match the installation hole <NUM> to lock the tab <NUM> and the clamping plate <NUM> on the second connector <NUM>.

In the embodiment of the invention, the locking structure <NUM> includes at least one group of locking members <NUM>, the number of groups of the locking members <NUM> corresponding to the number of the tabs <NUM>. One group of locking members <NUM> may include a plurality of locking members <NUM>, the plurality of locking members <NUM> are arranged corresponding to the plurality of installation holes <NUM>.

Specifically, in the embodiment of the invention, the second connector <NUM> of the connection structure <NUM> is connected with the tab <NUM> through the locking structure <NUM> and then through welding.

As shown in <FIG>, in the embodiment of the invention, the first assembly through hole <NUM> includes a first hole section <NUM> and a second hole section <NUM> communicating with each other, the first hole section <NUM> has a diameter smaller than the second hole section <NUM>, a second step surface is provided between the first hole section <NUM> and the second hole section <NUM>, and the first step surface of the locking member <NUM> abuts against the second step surface.

With the arrangement described above, the locking body <NUM> penetrates the second hole section <NUM>, the first hole section <NUM>, and the tab <NUM> to be connected to the installation hole <NUM>, at least portion of the end cap <NUM> is positioned in the second hole section <NUM>, and the first step surface abuts against the second step surface, so that the locking member <NUM> may lock the clamping plate <NUM> and the tab <NUM> on the second connector <NUM>.

As shown in <FIG>, in the embodiment of the invention, the top cover <NUM> is provided with first installation through holes <NUM>, and the pole <NUM> includes a base plate <NUM> and a pole body <NUM> arranged on the base plate <NUM>, at least portion of the pole body <NUM> is positioned in the first installation through hole <NUM>, and the base plate <NUM> is fixedly connected to the first connector <NUM> of the connection structure <NUM>.

In the technical solution described above, a contact area between the pole <NUM> and the first connector <NUM> may be expanded through the base plate <NUM>, and the base plate <NUM> is welded to the first connector <NUM> more conveniently, so that a over current capacity between the connection structure <NUM> and the pole <NUM> is further increased.

In the embodiment of the invention, the poles <NUM> include a positive pole and a negative pole. In some embodiments, the top cover <NUM> is provided with two first installation through holes <NUM> arranged corresponding to the positive and negative poles.

In the embodiment of the invention, both the positive pole and the negative pole are made of aluminum materials. Certainly, in the alternative embodiment, a positive pole and a negative pole may also be made of other conductive materials.

As shown in <FIG>, in the embodiment of the invention, the cover plate assembly for the battery further includes a sealing member <NUM>, the sealing member <NUM> is positioned between an inner wall surface of the first installation through hole <NUM> and a circumferential side wall of the pole body <NUM>.

With the arrangement described above, the sealing member <NUM> may seal a gap between the pole <NUM> and the corresponding first installation through hole <NUM>, so that in one aspect, no electrolyte in the battery may leak out, and in another aspect, moisture and impurities in air may also be prevented from entering the battery.

In the embodiment of the invention, the cover plate assembly for a battery includes two sealing members <NUM> arranged corresponding to the positive and the negative poles.

In the embodiment of the invention, the sealing members <NUM> are made of fluororubber.

As shown in <FIG> and <FIG>, in the embodiment of the invention, the cover plate assembly for the battery further include a separation plate <NUM> connected with the top cover <NUM>, the separation plate <NUM> is positioned between the top cover <NUM> and the base plate <NUM>, and the partition plate <NUM> is provided with a second installation through hole <NUM> corresponding to the first installation through hole <NUM> for the pole body <NUM> to pass through.

With the arrangement described above, the separation plate <NUM> separates the top cover <NUM> from the base plate <NUM>, to prevent the base plate <NUM> from making direct contact with the top cover <NUM> for insulation, thereby avoiding the top cover <NUM> from enabling electric communication between the positive and negative poles.

As shown in <FIG>, in the embodiment of the invention, the conductive structure <NUM> further include third connector <NUM> and plate <NUM>, the third connector <NUM> is connected to the top cover <NUM>, the third connector <NUM> is provided with a third installation through hole <NUM> corresponding to the first installation through hole <NUM>, the plate <NUM> is connected to the third connector <NUM>, the third connector <NUM> is positioned between the top cover <NUM> and the plate <NUM>, the plate <NUM> is provided with a fourth installation through hole <NUM> corresponding to the first installation through hole <NUM>, and the pole body <NUM> penetrates the second installation through hole <NUM>, the first installation through hole <NUM>, and the third installation through hole <NUM> in sequence to be connected to inner wall surface of the fourth installation through hole <NUM>.

In the technical solution described above, the plate <NUM> may be connected to a power supply or an electric device, to charge and discharge the battery.

Specifically, in the embodiment of the invention, the conductive structure <NUM> includes a positive plate as well as a negative plate and two third connectors <NUM> arranged corresponding to the positive pole and the negative pole, so that the two third connectors <NUM> may separate the two plates <NUM> from the top cover <NUM>, to avoid electric communication between the positive plate and the negative plate through the top cover <NUM>.

In embodiment of the invention, both the positive plate and the negative plate are made of aluminum materials. Certainly, in the alternative embodiment, a positive plate and a negative plate may also be made of other conductive materials.

In the embodiment of the invention, a third connector <NUM> corresponding to the positive plate is made of an insulation material, in some embodiments, one of polypropylene (PP), polyphenylene sulfide (PPS), acrylonitrile butadiene styrene (ABS), polyester resin (PET), etc. and a third connector <NUM> corresponding to the negative plate is made of a conductive material, in some embodiments, is a stainless steel.

In the embodiment of the invention, the third connector <NUM> corresponding to the positive plate is of a connection block structure, so that a creepage distance may be prolonged.

As shown in <FIG>, in the embodiment of the invention, a positioning protrusion <NUM> is provided on a side, facing the plate <NUM>, of the third connector <NUM>, and the plate <NUM> is provided with a positioning hole <NUM>, the positioning hole <NUM> is cooperated with the positioning protrusion <NUM>.

With the arrangement described above, the plate <NUM> is accurately assembled on the third connector <NUM>, to ensure that the third installation through hole <NUM> on the third connector <NUM> and the fourth installation through hole <NUM> on the plate <NUM> are coaxially arranged, so that the pole body <NUM> may better penetrate the third installation through hole <NUM> to be connected to the fourth installation through hole <NUM>.

As shown in <FIG>, in the embodiment of the invention, a positioning protrusion <NUM> is provided on a side, facing the top cover <NUM>, of the third connector <NUM>, and the top cover <NUM> is provided with positioning hole <NUM>, the positioning hole <NUM> is cooperated with the positioning protrusion <NUM>.

With the arrangement described above, the third connector <NUM> is accurately assembled on the top cover <NUM>, to ensure that the third installation through hole <NUM> on the third connector <NUM> and the first installation through hole <NUM> on the top cover <NUM> are coaxially arranged, so that the pole body <NUM> may better penetrate the first installation through hole <NUM> and then penetrate the third installation through hole <NUM>.

As shown in <FIG>, the embodiment of the invention provides a battery device. The battery device includes a cell <NUM> and the above cover plate assembly for the battery connected to the cell <NUM>, the cell <NUM> including a roll core <NUM> and at least one tab <NUM> connected to the roll core <NUM>, and the at least one tab <NUM> is connected to pole <NUM> through connection structure <NUM> and locking structure <NUM>. The battery device described above has all advantages of the cover plate assembly for a battery described above, which will not be described in detail herein.

As shown in <FIG>, in the embodiment of the invention, the cells <NUM> include two tabs <NUM> connected to the roll cores <NUM>, and the cover plate assembly for a battery includes two connection structures <NUM>, all the tabs <NUM> are connected to corresponding second connectors <NUM> through the locking structures <NUM>. With the arrangement described above, a locking structure <NUM> and a connection structure <NUM> of one cover plate assembly for a battery may connect one tab (such as a positive tab) to one pole <NUM> (such as a positive pole), and a locking structure <NUM> and a connection structure <NUM> of another cover plate assembly for a battery may connect another tab (such as a negative tab) to another pole (such as a negative pole), to form one conductive path.

In the embodiment of the invention, the cells <NUM> are winding type cells, and made of ternary lithium or lithium titanate.

As shown in <FIG>, <FIG>, and <FIG>, in the embodiment of the invention, the battery device includes two cells <NUM>, and two sides, opposite each other, of the second connector <NUM> of the connection structure <NUM> are each provided with the groove <NUM>, two grooves <NUM> are arranged corresponding to the two cells <NUM>, and the tabs <NUM> of the cells <NUM> are connected to the second connectors <NUM> through the locking structures <NUM>.

With the arrangement described above, one connection structure <NUM> may connect tabs <NUM> with the same polarity of two cells <NUM>, so that the two cells <NUM> may be arranged in parallel, to reduce internal resistance of the battery device to <NUM>% of original internal resistance, and the battery device generates less heat under the same electric quantity, which is beneficial to improvement of electrochemical performance of the battery device.

Specifically, as shown in <FIG>, in the embodiment of the invention, the tab <NUM> is provided with a second assembly through hole <NUM> corresponding to the installation hole <NUM>, the locking member <NUM> penetrating the second assembly through hole <NUM> to be connected to the installation hole <NUM>.

In the embodiment of the invention, the second assembly through hole <NUM> is a punched hole, which is conducive to subsequent riveting to the connection structure <NUM>.

In the embodiment of the invention, the tab <NUM> may be shaped by a punch during a process of assembling the tab <NUM> on the connection structure <NUM>, to make surface of the tab <NUM> more flat, and further to make the tab <NUM> better make contact with the connection structure <NUM>.

In the embodiment of the invention, the first assembly through hole <NUM>, the second assembly through hole <NUM>, and the installation hole <NUM> are coaxially arranged.

As shown in <FIG>, in the embodiment of the invention, the battery device further includes a case <NUM> connected with the top cover <NUM>, to encapsulate the cell <NUM>, the connection structure <NUM>, and the locking structure <NUM> in the case <NUM>.

With the arrangement described above, it is possible to prevent the electrolyte in the battery device from leaking out or prevent moisture and impurities in air from entering the battery.

In the embodiment of the invention, the case <NUM> is made of aluminum with low density and excellent welding performance. Certainly, in the alternative embodiment, a case <NUM> may be made of another metal material.

As shown in <FIG>, in the embodiment of the invention, the battery device further includes a protective bracket <NUM> connected with a separation plate <NUM> of the cover plate assembly for the battery, the protective bracket <NUM> is positioned in the case <NUM>, the protective bracket <NUM> includes a bracket body and an accommodating cavity for accommodating the cell <NUM>, and the bracket body is provided with a plurality of heat dissipation holes arranged in rows and columns and communicating with the accommodating cavity.

In the technical solution described above, the protective bracket <NUM> is connected with the separation plate <NUM>, to prevent the cell <NUM> and a portion, connected with the cell <NUM>, of the cover plate assembly for the battery from shaking in the case <NUM>. Further, the protective bracket <NUM> is provided with the plurality of heat dissipation holes arranged in rows and columns, to enhance the heat dissipation capacity of the battery and reduce a weight of the protective bracket <NUM>, to increase energy density of the battery device.

Specifically, in the embodiment of the invention, the protective bracket <NUM> may support, protect, and insulate the cells. In some embodiments, the protective bracket <NUM> may be made of any one of polyphenylene sulfide (PPS), acrylonitrile butadiene styrene (ABS), polypropylene (PP), polyester resin (PET), polyfluoroalkoxy (PFA), etc. which feature resistance to corrosion of the electrolyte, an excellent insulation property, an excellent dielectric property, resistance to a high temperature, and good flame retardancy.

In the embodiment of the invention, the protective bracket <NUM> is made of a PP material added with a certain flame retardant.

In the embodiment of the invention, the protective bracket <NUM> is of a U-shaped structure, to coat the cells <NUM>, the connection structures <NUM>, and the locking structures <NUM>.

As shown in <FIG>, in the embodiment of the invention, the top cover <NUM> is further provided with an explosion-proof hole, and the cover plate assembly for the battery further includes an explosion-proof valve, the explosion-proof valve is positioned in the explosion-proof hole.

With the arrangement described above, the explosion-proof valve may be used for gas pressure safety protection. If the battery device is inflated when in use, and a gas pressure in the battery device is greater than a bearable pressure when the explosion-proof valve explodes, the explosion-proof valve is expected to explodes, so that a problem the battery device explodes due to an overlarge internal gas pressure is prevented.

In the embodiment of the invention, the explosion-proof valve is made of an aluminum material, to facilitate laser welding.

As shown in <FIG>, in the embodiment of the invention, the top cover <NUM> is further provided with a liquid injection hole, and the cover plate assembly for a battery further includes a sealing nail, at least a portion of the sealing nail is positioned in the liquid injection hole.

With the arrangement described above, the liquid injection hole is sealed by the sealing nail after a liquid is injected.

In the embodiment of the invention, the sealing nail may be made of PP, PPS, ABS, PET, etc..

In the embodiment of the invention, the battery device further includes an insulation film <NUM> coating an outer side of the protective bracket <NUM> for insulation. In some embodiments, the insulation film <NUM> is a mylar film.

Claim 1:
A battery device, comprising a cell (<NUM>) and a cover plate assembly for the battery connected with the cell (<NUM>), wherein the cell (<NUM>) comprises roll cores (<NUM>) and tabs (<NUM>) connected with the roll cores (<NUM>), wherein the cover plate assembly for the battery comprises:
a top cover (<NUM>);
a conductive structure (<NUM>) arranged on the top cover (<NUM>), the conductive structure (<NUM>) comprising at least one pole (<NUM>) for conducting electricity;
at least one connection structure (<NUM>), a first end of each connection structure (<NUM>) being electrically connected with a corresponding pole (<NUM>) in the at least one pole (<NUM>), a second end of the each connection structure (<NUM>) being electrically connected with a tab (<NUM>) of the cell (<NUM>), and the second end of the each connection structure (<NUM>) being provided with an installation hole (<NUM>), wherein the each connection structure (<NUM>) comprises a first connector (<NUM>) and a second connector (<NUM>) connected to each other, an included angle being provided between the first connector (<NUM>) and the second connector (<NUM>), the first connector (<NUM>) forming the first end, and the second connector (<NUM>) forming the second end, at least one side of the second connector (<NUM>) is provided with a groove (<NUM>) for installing the tab (<NUM>); and
a locking structure (<NUM>) comprising at least one locking member (<NUM>), each locking member (<NUM>) penetrating the tab (<NUM>) to be fixedly connected with the installation hole (<NUM>), to lock the tab (<NUM>) on the connection structure (<NUM>) correspondingly, the tabs (<NUM>) being connected with the poles (<NUM>) through connection structures (<NUM>) and the locking structure (<NUM>).