CN210897352U

CN210897352U - Battery cover plate assembly, battery cell and connecting sheet

Info

Publication number: CN210897352U
Application number: CN201922029266.XU
Authority: CN
Inventors: 孙威; 朴镇奎; 李根雨; 孙俊吉; 曹启飞
Original assignee: Hunan Xinminya New Energy Technology Co Ltd; Sichuan Xinminya Battery Technology Co Ltd; Suzhou Lingwei New Energy Technology Co Ltd
Current assignee: Hunan Lingpai Energy Storage Technology Co ltd; Hunan Lingpai New Energy Research Institute Co ltd; Hunan Lingpai New Energy Technology Co Ltd; Hengyang Lingpai New Energy Technology Co Ltd; Hunan Lead Power Dazhi Technology Inc
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-06-30
Anticipated expiration: 2029-11-19

Abstract

The application provides a battery cover plate component, a battery core and a connecting sheet. The battery cover plate assembly includes: the cover plate comprises a cover plate, cover plate upper plastic, cover plate lower plastic and terminals; terminal holes are respectively formed in the cover plate upper plastic, the cover plate and the cover plate lower plastic, and each terminal comprises a terminal end plate and a terminal boss arranged on the terminal end plate; the terminal boss of the terminal penetrates through the terminal hole of the plastic on the cover plate, the terminal hole of the cover plate and the terminal hole of the plastic under the cover plate in sequence; and a connecting sheet guide groove for a connecting sheet to penetrate is arranged in a terminal boss of the terminal, and the connecting sheet covers a lug on the winding core. This application can improve the inside utilization ratio in the direction of height of electric core, and then improves the energy density of electric core.

Description

Battery cover plate assembly, battery cell and connecting sheet

Technical Field

The application relates to the field of lithium ion battery equipment, in particular to a battery cover plate assembly, a battery core and a connecting sheet applied to the battery core and the battery cover plate assembly.

Background

With the rapid advance of new energy battery technology, the market popularity of new energy vehicles is gradually increasing, and the most concerned problems about new energy vehicles are mileage and safety of electric vehicles. In view of the above problems, it is important for power battery manufacturers to improve the safety characteristics of the battery core and the energy density of the battery.

In the existing power battery design scheme, the connection between a winding core in the battery and a top cover terminal mostly adopts a scheme of welding by matching a bent tab with a connecting sheet, and by adopting the scheme, the space in the height direction cannot be completely utilized in the battery cell because the bending of the tab can sacrifice part of the space in the height direction; for the folded tab stacking state, if the control is not good in the manufacturing process, the short circuit of the battery can be induced; meanwhile, because the connecting sheets welded by the scheme are generally longer in length, the internal resistance of the battery can be increased, the heat productivity of the battery in the working process is further increased, and the service life of the battery is influenced, so that the conventional general scheme has certain defects in the aspects of improving the energy density of the battery, and in the aspects of safety design and cycle life of the battery.

SUMMERY OF THE UTILITY MODEL

The technical problem that this application will be solved is that the current book core adopts the utmost point ear of buckling to relegate the welded scheme of connection piece to occupy electric core inner space and influence the holistic energy density of battery with being connected of top cap terminal.

In order to solve the above technical problem, the present application discloses a battery cover plate assembly, includes: the cover plate comprises a cover plate, cover plate upper plastic, cover plate lower plastic and terminals; terminal holes are respectively formed in the cover plate upper plastic, the cover plate and the cover plate lower plastic, and each terminal comprises a terminal end plate and a terminal boss arranged on the terminal end plate; the terminal boss of the terminal penetrates through the terminal hole of the plastic on the cover plate, the terminal hole of the cover plate and the terminal hole of the plastic under the cover plate in sequence; and a connecting sheet guide groove for a connecting sheet to penetrate is arranged in a terminal boss of the terminal, and the connecting sheet covers a lug on the winding core.

Optionally, a connecting piece bending groove communicated with the connecting piece guide groove is formed in the terminal end plate.

Optionally, the connecting piece guide groove penetrates through the terminal end plate and the terminal boss.

Optionally, the battery cover plate assembly further comprises a sealing ring and a terminal gasket; the sealing ring is embedded between the cover plate and the plastic on the cover plate, and the sealing ring is sleeved on the terminal boss of the terminal; the terminal gasket is embedded in the plastic under the cover plate, the terminal boss of the terminal penetrates into the terminal hole of the plastic under the cover plate to be connected with the terminal gasket, and a terminal welding groove is formed in the terminal gasket.

Optionally, a plastic reinforcing rib is arranged on the surface, matched with the cover plate, of the cover plate lower plastic, and a hollow groove is formed in the end face, matched with the roll core, of the cover plate lower plastic.

Optionally, a tab groove matched with a tab on the winding core is further formed in the cover plate lower plastic.

Optionally, the number of the terminals is two, and the two terminals are respectively a positive terminal and a negative terminal; the two connecting pieces are respectively a positive connecting piece and a negative connecting piece; the negative terminal adopts a composite metal layer, wherein the material of the metal layer welded with the negative connecting sheet is the same as that of the negative connecting sheet.

The application also discloses a battery cell, which comprises a shell and a winding core arranged in the shell, wherein the winding core is provided with a lug; the battery cover plate assembly is characterized by also comprising a connecting sheet and the battery cover plate assembly; the connecting piece comprises a first blocking piece and a second blocking piece which are connected, the pole lug on the winding core is coated between the first blocking piece and the second blocking piece, and the connecting piece and the pole lug penetrate into the connecting piece guide groove to be connected with the terminal.

Optionally, the battery cell further includes a terminal cover plate; and the terminal is provided with a terminal cover plate groove matched with the terminal cover plate.

The application also discloses a connection piece for penetrate above-mentioned battery cover plate subassembly's connection piece guide slot, the connection piece includes: the first separation blade, the second separation blade and the connection top piece of one side coincidence have the contained angle between first separation blade and the second separation blade.

Compared with the prior art, the technical scheme of the application has at least the following beneficial effects:

the pole lug on the winding core does not need to be bent in the process of assembling the pole lug to the battery cover plate component and is coated by the connecting piece, and therefore the connecting piece directly penetrates through the cover plate component and is connected with the terminal, so that the bending and compression of the pole lug in the process of assembling the battery core can be effectively avoided, the utilization rate of the inside of the battery core in the height direction is improved, and the energy density of the battery core is further improved.

Because the bending and the compression of the pole lug in the cell assembling process are effectively avoided, the opportunity that the root of the pole lug is in contact with the roll core after the pole lug is compressed can be avoided, and the risk of contact short circuit of the pole lug and the pole piece caused by excessive compression is reduced.

The battery cover plate component can effectively reduce the connection distance between the winding core and the cover plate terminal, greatly reduces the internal resistance of the connection component, and simultaneously improves the heat productivity of the battery core in the circulation and the multiplying power discharge process inside the lug and the connection sheet which are originally inside the battery core and are completely integrated to the top cover terminal, thereby further improving the service life and the performance of the battery core.

After the terminal is sealed by pouring glue, the electrical connection between the roll core and the terminal is more reliable, the risk of electrical connection failure caused by jolting due to vibration in the actual use process is avoided, and the service life of the battery core is prolonged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is an external structural schematic diagram of a battery cell according to an embodiment of the present application;

fig. 2 is an exploded schematic structure diagram of a battery cell according to an embodiment of the present application;

fig. 3 is an exploded schematic view of a battery cover plate assembly according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a battery cover plate assembly assembled from a bottom view, a front view and a top view according to an embodiment of the present disclosure;

FIG. 5A is a schematic view of a cross section along the A-A direction of the battery cover plate assembly shown in FIG. 4 and an enlarged structure thereof;

FIG. 5B is a schematic view of the battery cover plate assembly shown in FIG. 4 taken along the B-B direction and an enlarged structure thereof;

FIG. 6 is a schematic structural diagram of a lower cover plate plastic of the battery cover plate assembly according to the embodiment of the present disclosure;

FIG. 7 is a schematic structural view illustrating the assembly of the winding core and the connecting sheet according to the embodiment of the present application;

FIG. 8 is a schematic structural diagram illustrating an assembly of a battery cover plate assembly and a winding core according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural view illustrating an assembly of a core and a shell according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram illustrating the assembly of the terminal cover plate to the battery cover plate assembly according to the embodiment of the present disclosure;

fig. 11 is a schematic diagram of a structure after the battery cell is assembled and an enlarged structural diagram of a cross section of a side view of the positive terminal;

fig. 12 is a schematic structural diagram of a battery cell according to another embodiment of the present disclosure after assembly.

The following is a supplementary description of the drawings:

1-a battery cell; 2-a battery cover plate assembly; 3-winding core; 4-connecting the sheets; 5-a shell; 6-terminal cover plate;

20-a terminal; 29-plastic is coated on the cover plate; 21-negative terminal; 22-positive terminal; 23-a sealing ring; 24-plastic is arranged on the negative electrode cover plate; 25-plastic is coated on the positive electrode cover plate; 26-a cover plate; 27-plastic under the cover plate; 28-terminal pads;

201-terminal end plate; 202-terminal boss; 203-connecting piece guide groove; 204-terminal cover plate groove; 205-connecting piece bending groove; 260-terminal holes; 270-terminal holes; 290-terminal holes; 271-plastic reinforcing ribs; 272-end face of lower plastic; 273-hollow out groove; 274-tab groove; 281-terminal solder groove;

31-a tab; 41-a first baffle plate; 42-a second baffle plate; 43-attachment of the topsheet; 44-ultrasonic welding zone; 45-gluing a layer; 46-laser weld zone; 47-connecting piece laser welding track; 51-seal welding trace; 61-sealing glue groove; 62-terminal cover plate welding trace; 63-sealing area.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The application provides with the new design of a lithium ion power battery's electric core and apron (top cap) subassembly, can avoid rolling up the utmost point ear looper of core in the assembling process, improves the inside space utilization of electric core, reduces the internal resistance of being connected between utmost point ear and top cap terminal to improve the energy density of electric core, when reducing the safety risk, improved the cycle life of battery.

The present application is described in detail below with reference to the following embodiments and the accompanying drawings, where the embodiments of the present application take a square aluminum-casing battery with two terminals as an example, and it can be understood by those skilled in the art that, in practical applications, the present application can also be applied to a single-terminal or multi-terminal (more than two) battery cell assembly scheme as required.

Referring to fig. 1 and fig. 2 in combination, a battery cell 1 according to an embodiment of the present disclosure includes a battery cover plate assembly 2, a winding core 3, a connecting sheet 4, a casing 5, and a terminal cover plate 6. The winding core 3 is installed in the housing 5, a tab (not shown) is provided on the winding core 3, and the tab on the winding core 3 is wrapped between the first retaining piece and the second retaining piece of the connecting piece 4 (the structure of the connecting piece 4 will be described in detail later). The specific structure type of the core 3 suitable for the application can be a winding type or a lamination type, and the structure can be a single core or a plurality of cores connected in parallel.

With continuing reference to fig. 2 and fig. 3, the battery cover plate assembly 2 of the embodiment of the present application at least includes: terminal 20, cover top plastic 29, cover 26, and cover bottom plastic 27.

Terminal holes

290, 260 and 270 are respectively arranged in the cover plate upper plastic 29, the cover plate 26 and the cover plate lower plastic 27; the terminal 20 comprises a terminal end plate 201 and a terminal boss 202 arranged on the terminal end plate 201; the terminal boss 202 of the terminal 20 sequentially penetrates through the terminal hole 290 of the cover plate upper plastic 29, the terminal hole 260 of the cover plate 26 and the terminal hole 270 of the cover plate lower plastic 27; a connecting sheet guide groove (such as a connecting sheet guide groove 203 shown in fig. 5A and 5B) for a connecting sheet 4 to penetrate is arranged in the terminal boss 202 of the terminal 20, the connecting sheet 4 covers the tab on the winding core 3 (namely, the tab covers between the first catch and the second catch of the connecting sheet 4), and the connecting sheet 4 and the tab covered by the connecting sheet 4 penetrate into the connecting sheet guide groove 203 to be connected with the terminal 20. In addition, corresponding to the terminal cover 6, a terminal cover groove 204 is provided on the terminal 20 to be matched with the terminal cover 6, specifically, the terminal cover groove 204 is provided on the terminal end plate 201 to allow the terminal cover 6 to be embedded into the terminal 20.

Based on the design requirement for the polarity of the cell terminal, there are two terminals 20 in this embodiment, namely a negative terminal 21 and a positive terminal 22; correspondingly, there may be two cover-plate plastics 29, namely a negative-cover-plate plastic 24 and a positive-cover-plate plastic 25; correspondingly, the connecting piece connected to the negative terminal 21 is a negative connecting piece, and the connecting piece connected to the positive terminal 22 is a positive connecting piece. The two

terminals

21, 22 have the same shape and structure, and the two cover plates have the same shape and structure of the

plastics

24, 25, so the same reference numerals are used for the same structure in the drawings.

The plastic on the positive electrode cover plate and the plastic on the negative electrode cover plate have different effects, and in a battery design scheme, a certain electrical connection is generally required to be ensured between the shell and the positive electrode terminal, so that the potential of the shell can be improved, and the electrochemical corrosion of the battery cell on the interior of the shell in the charging and discharging processes is avoided, so that the plastic on the positive electrode cover plate corresponding to the positive electrode terminal needs to be made of a conductive material, and the conductive plastic can be made of a metal material; because the apron of casing top cap has certain electrical connection demand with the positive terminal, so in order to avoid negative terminal and the apron of casing top cap to take place the short circuit, so just need adopt insulating material in order to guarantee that it has fine electric insulating properties to the last plastic of negative terminal corresponding negative pole apron, can adopt insulating plastic. In the aspect of structural design of the plastic on the positive electrode cover plate and the plastic on the negative electrode cover plate, the plastic on the negative electrode cover plate is required to effectively coat the negative electrode terminal as much as possible due to the insulation requirement of the plastic on the negative electrode cover plate; the plastic on the positive cover plate is communicated with the top cover plate, so that the structure of the positive cover plate does not have excessive requirements, and the positive cover plate can be the same as the structure of the plastic on the negative cover plate for the sake of attractive appearance, and can also be designed to be different from the structure of the plastic on the negative cover plate.

Further, the battery cover plate assembly of this embodiment may further include: a seal ring 23 and a terminal pad 28. The sealing ring 23 is embedded between the cover plate 26 and the cover plate upper plastic 29, and the sealing ring 23 is sleeved on the terminal boss 202 of the terminal 20; the terminal gasket 28 is embedded in the cover plate lower plastic 27, the terminal boss 202 of the terminal 20 penetrates the terminal hole 270 of the cover plate lower plastic 27 to be connected with the terminal gasket 28, and the terminal gasket 28 is provided with a terminal welding groove 281.

Based on the battery cover plate assembly, please refer to fig. 3, the method for assembling the battery cover plate assembly of the embodiment of the present application at least includes: providing a cover plate 26, cover plate upper plastic (negative cover plate upper plastic 24 and positive cover plate upper plastic 25), cover plate lower plastic 27 and terminals (a negative terminal 21 and a positive terminal 22), wherein

terminal holes

290, 260 and 270 are respectively formed in the cover plate upper plastic, the cover plate and the cover plate lower plastic, the terminals comprise terminal end plates 201 and terminal bosses 202 arranged on the terminal end plates 201, connecting piece guide grooves for connecting pieces to penetrate are formed in the terminal bosses 202 of the terminals, and the connecting pieces cover tabs on winding cores; the terminal boss 202 of the terminal is sequentially inserted into the terminal hole 290 of the plastic on the cover plate, the terminal hole 260 of the cover plate and the terminal hole 270 of the plastic under the cover plate.

Further, the assembly method of the battery cover plate assembly may further include: providing a sealing ring 23 and a terminal gasket 28, wherein a terminal welding groove 280 is formed in the terminal gasket 28; when the terminal boss 202 of the terminal is inserted into the terminal hole 290 of the plastic on the cover plate and the terminal hole 260 of the cover plate, the sealing ring 23 is sleeved on the terminal boss 202 of the terminal, and the sealing ring 23 is embedded between the cover plate 26 and the plastic 24 and 25 on the cover plate; embedding the terminal gasket 28 in the cover plate lower plastic 27, so that the terminal boss 202 of the terminal penetrates through the terminal hole 270 of the cover plate lower plastic and is connected with the terminal gasket 28; the terminal boss 202 and the terminal pad 28 of the terminal are laser-welded at the position of the terminal welding groove 281.

In specific implementation, when the battery cover plate assembly is assembled, the assembly can be performed according to the arrow direction shown in fig. 3, the end plate lower plastic 27 is attached to the cover plate 26, the cover plate

upper plastics

24 and 25 are attached to the corresponding positions of the cover plate 26, the two seal rings 23 are respectively embedded between the cover plate

upper plastics

24 and 25 and the cover plate 26, and the two terminal gaskets 28 are respectively embedded in the cover plate lower plastic 27; the terminal bosses 202 of the

terminals

21 and 22 are inserted into the gasket 23, the terminal hole 290 of the upper cover, the terminal hole 260 of the cover 26, and the terminal hole 270 of the lower cover 27 in this order, and are fitted into the terminal welding grooves 281 of the terminal gasket 28.

The assembled structure is shown in fig. 4 (from top to bottom, sequentially as a bottom view, a front view and a top view), wherein the structure along the section a-a and its enlarged structure refer to fig. 5A (corresponding to the positive terminal 22 and the plastic 25 on the positive cover plate), the structure along the section B-B and its enlarged structure refer to fig. 5B (corresponding to the negative terminal 21 and the plastic 24 on the positive cover plate), the sealing between the negative terminal 21 and the cover plate 26 and the sealing between the positive terminal 22 and the cover plate 26 are mainly ensured by the compression of the sealing ring 23, in order to ensure the compression of the sealing ring 23, after the cover plate assembly is assembled to a specified size, the two terminal gaskets 28 are respectively laser-welded with the negative terminal 21 and the positive terminal 22, and the specific welding position is the terminal welding groove 281 as shown in the figure, that is the position where the terminal boss is connected with the terminal gasket 28.

Further, there are two terminals in the embodiment, which are a positive terminal 22 and a negative terminal 21, wherein the positive terminal 22 may be made of a single conductive material (e.g., aluminum or copper), and the negative terminal 21 may be made of a composite conductive material (e.g., copper and aluminum).

Specifically, the negative terminal 21 may adopt a composite metal layer, and in fig. 5B, different layers are distinguished by different filling lines, where the material of the metal layer welded to the negative connecting sheet is the same as that of the negative connecting sheet. Taking the negative connecting sheet made of copper as an example, the specific structure of the negative terminal 21 can have two schemes: in the first scheme, two layers of copper-aluminum composite materials are adopted, as shown in (i) in fig. 5B, the upper layer of the negative terminal 21 is copper, the lower layer of the negative terminal is aluminum, the surface of the upper layer is used for welding with a negative connecting sheet made of the same material, the lower layer of the negative terminal is used for welding with a terminal gasket 28, and a terminal cover plate welded on the corresponding negative terminal 21 is made of the same material as the upper layer; in the second scheme, a three-layer copper-aluminum composite material is adopted, as shown in (ii) in fig. 5B, the upper layer and the lower layer of the negative terminal 21 are made of aluminum, the middle layer is made of copper, the middle layer is used for welding with a negative connecting sheet made of the same material, the upper layer is used for welding with a terminal cover plate, the lower layer is used for welding with a terminal gasket 28, and after the scheme is adopted, the terminal cover plates welded on the negative terminal 21 and the positive terminal 22 can be made of the same material (for example, aluminum). The two schemes can ensure effective welding of the negative terminal and the negative connecting sheet, and simultaneously can reduce the overall weight of the negative terminal.

Generally, the positive electrode connecting piece is made of aluminum and the negative electrode connecting piece is made of copper, and the welding method by laser welding requires that the connecting piece and the terminal to be welded are made of the same material, and correspondingly, the positive electrode terminal is made of aluminum and the negative electrode terminal is made of copper, but since the density of copper is 3 times of that of aluminum, the negative electrode terminal can be designed to be made of copper-aluminum composite in order to reduce the weight of the negative electrode terminal, so that the weight of the negative electrode terminal can be reduced as much as possible even when the welding conditions are satisfied.

Reducing the weight of the negative terminal reduces the overall weight of the battery, which is intended to increase the energy density of the battery, and the energy density of the battery is calculated by the following formula: the energy density is the battery capacity/battery weight, so the battery weight is a relatively concerned parameter in the battery design process, and even if the weight is reduced by several grams, the energy density of the battery is obviously improved.

In addition, as shown in fig. 5A and 5B, a connecting piece bent groove 205 communicating with the connecting piece guide groove 203 may be further provided in the terminal end plate of the negative terminal 21 and the positive terminal 22 of the present embodiment. After the connecting sheet penetrates into the connecting sheet guide groove 203, the connecting sheet can be bent and attached in the corresponding connecting sheet bending groove 205, so that the occupation of the connecting sheet on the internal space of the terminal is reduced.

Further, referring to fig. 3 and fig. 6, in the battery cover plate assembly of the present embodiment, in order to reduce the weight of the cover plate lower plastic 27, the cover plate lower plastic 27 may be designed to be a hollow structure, a plastic rib 271 may be further disposed on a surface of the cover plate lower plastic 27, which is engaged with the cover plate 26, and a hollow groove 273 may be further disposed on an end surface 272 of the cover plate lower plastic 27, which is engaged with the winding core. The plastic ribs 271 and the hollow grooves 273 can be uniformly spaced. The terminal surface 272 of plastic makes to roll up the core terminal surface and obtain effectual support under the apron, and plastic strengthening rib 271 can provide effectual support intensity for the terminal surface 272 of plastic down, and fretwork groove 273 can be under the condition that does not influence intensity reduce weight to avoid electrolyte to persist in the sealed cavity that the inside plastic strengthening rib 271 of plastic 27 formed under the apron.

In addition, in this embodiment, the cover plate lower plastic 27 is further provided with a tab groove 274 that is engaged with the tab on the winding core, and as shown in fig. 5A, 5B and 6, the tab groove 274 is provided on the end surface 272 of the cover plate lower plastic 27, and can be respectively engaged with the positive tab and the negative tab after the winding core 3 is assembled, so as to prevent the cover plate lower plastic 27 from pressing the root of the tab 31 in the height direction (please refer to fig. 9), thereby reducing the safety risk of the battery cell.

The main functions of the plastic under the cover plate are two points: firstly, the electrical insulation between the winding core and the top cover is ensured, and because the top cover is in positive polarity, if bare metal is in direct contact with the end face of the winding core, especially the position of a negative electrode tab, the short circuit of a battery cell can be directly caused, so that insulating plastic is generally selected on the material of lower plastic; secondly, ensure the effective support to rolling up the core terminal surface, because roll up the core and accomplish the apron welding back in the shell assembly targets in place, the inside of electric core is rolled up the core and is in slight pressurized state, and electric core also can be in under the environment of vibrations in the loading use, if not enough to the constraint of rolling up the core, perhaps produce local over-compression to rolling up the core terminal surface, will influence very easily and roll up core life-span or take place the short circuit, so under the apron on the structural design of plastic, require to guarantee to roll up the core terminal surface and obtain effectual support, local over-compression can not appear.

Based on the battery cover plate assembly and the assembling method thereof, the assembling method of the battery cell of the embodiment includes: assembling the connecting sheet with the winding core, as shown in fig. 7; assembling the battery cover plate component and the winding core as shown in fig. 8; assembly of the shell with the core, as shown in fig. 9; the assembly of the terminal cover plate with the battery cover plate assembly is shown in fig. 10 and 11. The respective steps will be described in detail below.

Referring to fig. 7, a winding core 3 and a connecting sheet 4 are provided, wherein a tab 31 is provided on the winding core 3, and the connecting sheet 4 includes a first blocking sheet 41 and a second blocking sheet 42 which are connected and have an included angle; placing the tab 31 between the first blocking piece 41 and the second blocking piece 42, and fastening the first blocking piece 41 and the second blocking piece 42 to wrap the tab 31 with the first blocking piece 41 and the second blocking piece 42; and performing ultrasonic welding on the fastening areas of the first blocking piece 41, the second blocking piece 42 and the tab 31 to assemble the connecting piece 4 to the winding core 3.

In the present embodiment, as shown in fig. 7 (a), there are two tabs 31 corresponding to the positive terminal and the negative terminal, and the tabs are respectively a positive tab and a negative tab; connection piece 4 also is two, is anodal connection piece and negative pole connection piece respectively, and anodal connection piece and negative pole connection piece's structure is the same, includes respectively: the first blocking piece 41, the second blocking piece 42 and the connecting top piece 43 are overlapped at one side, and an included angle is formed between the first blocking piece 41 and the second blocking piece 42. The first blocking piece 41, the second blocking piece 42 and the connecting top piece 43 are connected to the same side, or the first blocking piece 41, the second blocking piece 42 and the connecting top piece 43 share the same side, and the included angle between the first blocking piece 41 and the second blocking piece 42 is usually 90 degrees, and may be other degrees between 0 degree and 180 degrees, as long as the tab 31 can be inserted.

When assembling the connecting sheet 4 and the winding core 3, the tab 31 of the winding core 3 is pre-welded and shaped to the state shown in fig. 7 (a), then the connecting sheet 4 is installed according to the arrow direction shown in (a), so that the tab 31 is placed between the first blocking sheet 41 and the second blocking sheet 42, and the first blocking sheet 41 and the second blocking sheet 42 which are in the 90-degree opening and closing state are buckled on the tab 31 after being installed in place; then, ultrasonic welding is performed on the ultrasonic welding regions 44 (i.e., the fastening regions of the first and

second stoppers

41 and 42 and the tab 31) as shown in fig. 7 (b), respectively, so as to complete the assembly of the connecting sheet 4 and the winding core 3.

After the assembly of the connecting plate 4 and the winding core 3 is completed, referring to fig. 8 (taking a side view section in the direction of the positive terminal as an example), the assembled battery cover plate assembly 2, the assembled winding core 3 and the connecting plate 4, which are assembled by the above-mentioned method for assembling the battery cover plate assembly, are assembled, so that the tab 31 and the connecting plate 4 covering the tab 31 are inserted into the connecting plate guide groove 203 in the terminal boss of the terminal. In this embodiment, the battery cover plate assembly 2 is assembled to the ultrasonically welded winding core 3 in the direction indicated by the arrow, the end surface 272 of the cover plate lower plastic contacts with the end surface of the winding core 3, and the tab 31 and the connecting piece on the winding core 3 penetrate into the connecting piece guide groove 203 in the terminal boss. The terminal bosses with the connecting piece guide grooves 203 integrally penetrate through the battery cover plate assembly 2 and are welded with the corresponding terminal gaskets 28 at the terminal welding grooves 281, so that the sealing ring 23 can be effectively supported in compression to ensure effective sealing between the terminal 20 and the cover plate 26.

Further, before the assembled battery cover plate assembly 2 is assembled with the assembled jelly roll 3 and the connecting sheet 4, a sealant may be applied to the inner wall of the ultrasonic welding region 44 as shown in fig. 7 or the connecting sheet guide groove 203 as shown in fig. 8. Before assembly, glue is applied to the inner wall of the ultrasonic welding area 44 or the connecting piece guide groove 203, and after assembly, the glue coating layer 45 shown in fig. 8 is filled in a gap formed by the connecting piece 4 and the connecting piece guide groove 203, and can play a role in sealing and fixing after curing.

With continued reference to fig. 9, a housing 5 is provided, and a winding core with a battery cover assembly mounted thereto is mounted within the housing 5. In the present embodiment, after the assembly of the battery cover plate assembly 2 and the winding core 3 is completed, the case 5 is assembled in the direction of the arrow shown in fig. 9; and then, a bending process of the connecting sheet is carried out, specifically, a connecting sheet bending groove 205 communicated with the connecting sheet guide groove 203 is further arranged in the terminal end plate, the connecting top sheet 43 is bent to be arranged in the connecting sheet bending groove 205, a state shown by the bent connecting sheet 4 can be achieved after bending, and the bent connecting top sheet 43 can be attached to the corresponding connecting sheet bending groove 205, so that the occupation of the connecting sheet 4 on the inner space of the terminal 20 can be reduced.

With continued reference to fig. 10, after the winding core with the battery cover assembly mounted thereon is mounted into the housing 5, the housing 5 and the battery cover assembly are hermetically welded; and carrying out laser welding on the terminal and the connecting sheet penetrating into the connecting sheet guide groove. In this embodiment, after the winding core is installed in the shell 5, the shell 5 and the battery cover plate assembly are hermetically welded, where a specific welding track is a sealing welding track 51 as shown in the figure, that is, an edge area where the shell 5 contacts the cover plate 26 of the battery cover plate assembly; the two connecting pieces are laser welded at the locations of the laser weld areas 46 as shown, respectively, to ensure their effective connection with the corresponding terminals.

Referring to fig. 10 and fig. 11 in combination, after laser welding of the connecting piece is completed, providing the terminal cover plate 6, and providing a terminal cover plate groove 204 in the terminal end plate 201, which is matched with the terminal cover plate 6; the terminal cover 6 is fitted into the terminal cover groove 204, and the terminal cover 6 and the terminal plate 201 are hermetically welded. In this embodiment, the top of the terminal is provided with a terminal cover plate groove 204, which can be matched with the terminal cover plate 6, so that the upper surface of the terminal cover plate 6 is completely attached to the upper surface of the terminal 20, thereby facilitating the assembly of the battery cell in the subsequent module. After the terminal cover plates 6 are assembled in place, the two terminal cover plates 6 are seal welded, as shown, by terminal cover plate weld traces 62 (i.e., the contact edges of the terminal cover plates 6 with the terminal cover plate grooves 204).

Further, in this embodiment, as shown in fig. 10, a sealant groove 61 is formed on the surface of the terminal cover plate 6, which is matched with the terminal cover plate groove 204; before the terminal cover 6 is fitted into the terminal cover groove 204 in the terminal end plate 201, a sealant is applied into the sealant groove 61. The terminal cover plate 6 can be further filled with sealant in the sealant groove 61 before assembly, and then the terminal cover plate 6 is rotationally buckled to the terminal end plate 201, so that after the terminal cover plate 6 is subjected to sealing welding, the sealant which is pre-filled in the sealant groove 61 can be filled in a sealing area 63 (namely, a gap formed after the sealant groove is buckled with the terminal cover plate groove) of the terminal cover plate groove shown in fig. 11, and therefore, the functions of fixing and sealing are achieved. In other embodiments, a sealant may also be applied within the terminal cover plate recess 204 prior to embedding the terminal cover plate within the terminal cover plate recess in the terminal end plate, and in particular, may be applied to the laser weld zone 46 within the terminal cover plate recess 204 as shown in fig. 10.

It should be noted that, in the above embodiment, the connecting sheet is bent to reduce the occupation of the internal space of the terminal, in other embodiments, as shown in fig. 12, the head portion of the connecting sheet (i.e., the connecting top sheet) is not bent, the connecting sheet guide groove 203 penetrates through the terminal end plate 201 and the terminal boss 202, after the sealing treatment is performed by the glue coating layer 45, the terminal 20 and the connecting sheet 4 penetrating through the connecting sheet guide groove 203 are laser welded, and the connecting sheet 4 and the upper surface of the terminal 20 can be directly welded on the connecting sheet laser welding track 47 shown in the figure, so that the terminal cover plate can be omitted.

As can be seen from fig. 8, 9, 11 and 12, after the winding core is assembled with the battery cover plate assembly, the tab on the winding core does not need to be bent during the assembly process, and is covered by the first and second stop pieces of the connecting piece, so that the tab is directly penetrated through and connected with the cover plate assembly by the connecting piece.

In conclusion, upon reading the present detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure can be presented by way of example only, and not limitation. Those skilled in the art will appreciate that the present application is intended to cover various reasonable variations, adaptations, and modifications of the embodiments described herein, although not explicitly described herein. Such alterations, improvements, and modifications are intended to be suggested by this disclosure, and are within the spirit and scope of the exemplary embodiments of this disclosure.

Furthermore, certain terminology has been used in this application to describe embodiments of the disclosure. For example, "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various portions of this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined as suitable in one or more embodiments of the disclosure.

It should be appreciated that in the foregoing description of embodiments of the disclosure, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of the subject disclosure. Alternatively, various features may be dispersed throughout several embodiments of the application. This is not to be taken as an admission that any of the features of the claims are essential, and it is fully possible for a person skilled in the art to extract some of them as separate embodiments when reading the present application. That is, embodiments in the present application may also be understood as an integration of multiple sub-embodiments. And each sub-embodiment described herein is equally applicable to less than all features of a single foregoing disclosed embodiment.

In some embodiments, numbers expressing quantities or properties used to describe and claim certain embodiments of the application are to be understood as being modified in certain instances by the term "about", "approximately" or "substantially". For example, "about," "approximately," or "substantially" can mean a ± 20% variation of the value it describes, unless otherwise specified. Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the embodiments of the application are approximations, the numerical values set forth in the specific examples are reported as precisely as possible.

Each patent, patent application, publication of a patent application, and other material, such as articles, books, descriptions, publications, documents, articles, and the like, cited herein is hereby incorporated by reference. All matters hithertofore set forth herein except as related to any prosecution history, may be inconsistent or conflicting with this document or any prosecution history which may have a limiting effect on the broadest scope of the claims. Now or later associated with this document. For example, if there is any inconsistency or conflict in the description, definition, and/or use of terms associated with any of the included materials with respect to the terms, descriptions, definitions, and/or uses associated with this document, the terms in this document are used.

Finally, it should be understood that the embodiments of the application disclosed herein are illustrative of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Accordingly, the disclosed embodiments are presented by way of example only, and not limitation. Those skilled in the art may implement the present application in alternative configurations according to the embodiments of the present application. Thus, embodiments of the present application are not limited to those embodiments described with accuracy in the application.

Claims

1. A battery cover plate assembly, comprising: the cover plate comprises a cover plate, cover plate upper plastic, cover plate lower plastic and terminals; terminal holes are respectively formed in the cover plate upper plastic, the cover plate and the cover plate lower plastic, and each terminal comprises a terminal end plate and a terminal boss arranged on the terminal end plate; the terminal boss of the terminal penetrates through the terminal hole of the plastic on the cover plate, the terminal hole of the cover plate and the terminal hole of the plastic under the cover plate in sequence; and a connecting sheet guide groove for a connecting sheet to penetrate is arranged in a terminal boss of the terminal, and the connecting sheet covers a lug on the winding core.

2. The battery cover plate assembly of claim 1, wherein a connecting tab bent groove communicating with the connecting tab guide groove is formed in the terminal end plate.

3. The battery cover plate assembly of claim 1, wherein the connecting tab channel extends through the terminal end plate and the terminal boss.

4. The battery cover plate assembly of claim 1, further comprising a seal ring and a terminal gasket; the sealing ring is embedded between the cover plate and the plastic on the cover plate, and the sealing ring is sleeved on the terminal boss of the terminal; the terminal gasket is embedded in the plastic under the cover plate, the terminal boss of the terminal penetrates into the terminal hole of the plastic under the cover plate to be connected with the terminal gasket, and a terminal welding groove is formed in the terminal gasket.

5. The battery cover plate assembly according to claim 1, wherein a plastic reinforcing rib is arranged on the surface of the plastic under the cover plate, which is matched with the cover plate, and a hollow groove is arranged on the end surface of the plastic under the cover plate, which is matched with the winding core.

6. The battery cover plate assembly of claim 1, wherein the cover plate lower plastic is further provided with tab grooves for engaging tabs on the winding core.

7. The battery cover plate assembly of claim 1, wherein there are two of said terminals, a positive terminal and a negative terminal; the two connecting pieces are respectively a positive connecting piece and a negative connecting piece; the negative terminal adopts a composite metal layer, wherein the material of the metal layer welded with the negative connecting sheet is the same as that of the negative connecting sheet.

8. A battery electric core, comprising a shell and a winding core arranged in the shell, wherein the winding core is provided with a pole lug, and the battery electric core is characterized by further comprising a connecting sheet and the battery cover plate component of any one of claims 1 to 7; the connecting piece comprises a first blocking piece and a second blocking piece which are connected, the pole lug on the winding core is coated between the first blocking piece and the second blocking piece, and the connecting piece and the pole lug penetrate into the connecting piece guide groove to be connected with the terminal.

9. The battery cell of claim 8, further comprising a terminal cover plate; and the terminal is provided with a terminal cover plate groove matched with the terminal cover plate.

10. A connecting piece for penetrating into a connecting piece guide groove of a battery cover plate assembly according to any one of claims 1 to 7, comprising: the first separation blade, the second separation blade and the connection top piece of one side coincidence have the contained angle between first separation blade and the second separation blade.