CN217691388U - Cover plate, battery and battery pack - Google Patents

Abstract

The utility model relates to a battery technology field, concretely relates to apron, battery and group battery. The board includes: the top cover is provided with a flat plate part and a protruding part, the upper surface of the protruding part is higher than that of the flat plate part, the flat plate part is suitable for being connected with a first tab of the pole core, a first mounting hole is formed in the protruding part, and a cavity is formed below the protruding part to separate the protruding part from the pole core; the pole is located in the first mounting hole and is connected with the protruding portion in an insulating mode, and the pole is suitable for being connected with a second pole lug of the pole core. Through setting up flat plate portion and utmost point post and being connected with two utmost point ears of utmost point core respectively, realized the monopole post design of apron, only remain an utmost point post, flat plate portion has the function of another utmost point post concurrently to reduce the spare part quantity of apron, simplify assembly process, reduction in production cost, and, the cavity that forms through the below of bellying separates bellying and utmost point core, effectively prevents that utmost point core and bellying from taking place the short circuit, simple structure and effectual.

Description

Cover plate, battery and battery pack

Technical Field

The utility model relates to a battery technology field, concretely relates to apron, battery and group battery.

Background

With the development of new energy industry, square-shell lithium batteries occupy more and more important positions in the market, and the competition of battery manufacturers is intensified day by day, so that the improvement of indexes such as energy density, cycle life, overcurrent capacity and safety of the batteries is emphasized, and the pressure for reducing the cost of the batteries is also faced. In order to improve the energy density and reduce the cost of the battery, the structure of the battery is simplified as much as possible while the performance requirements are met. The battery cover plate component generally comprises a positive pole, a negative pole, a top cover main body, a sealing ring, an insulating part, lower plastic and the like, wherein the two poles and the top cover adopt an assembly mode of combining laser welding and injection molding.

However, the battery cover plate in the prior art has more parts, and the assembly process is not convenient and efficient enough, so that the cost is not reduced.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the apron among the prior art and not being convenient for reduce cost's defect to a apron, battery and group battery are provided.

In order to solve the above problem, the utility model provides an apron, include: the top cover is provided with a flat plate part and a protruding part, the upper surface of the protruding part is higher than that of the flat plate part, the flat plate part is suitable for being connected with a first pole lug of the pole core, a first mounting hole is formed in the protruding part, and a cavity is formed below the protruding part to separate the protruding part from the pole core; and the pole column is positioned in the first mounting hole and is in insulated connection with the protruding part, and the pole column is suitable for being connected with the second pole ear of the pole core.

Optionally, the cover plate further includes: and the sealing insulating part is arranged in the first mounting hole and surrounds the outside of the pole column so as to insulate the sealing bulge part and the pole column.

Optionally, the surface of the protruding portion extends outwards to form a bendable fixing portion, and the fixing portion is suitable for bending towards the direction of the pole to form a buckling structure so as to fix the pole.

Optionally, the fixing portion is formed by extending downward from the lower surface of the top cover to fix the lower portion of the pole.

Optionally, the first mounting hole includes an upper hole section, a lower hole section and a limiting surface connecting the upper hole section and the lower hole section, the aperture of the upper hole section is smaller than that of the lower hole section, the pole has a fitting surface corresponding to the limiting surface, and the limiting surface is suitable for limiting the pole.

Optionally, utmost point post is less than the external diameter of second column section including the first column section and the second column section that set up from top to bottom, the external diameter of first column section, and the upper surface of second column section forms the fitting surface, and the fixed part is buckled the back, and sealing insulation butt is on the lower surface of second column section.

Optionally, the cover plate further includes: insulation board, insulation board set up the lower surface at the bellying, and utmost point post is still including the third column section that is located the second column section below, and the external diameter of third column section is less than the external diameter of second column section, and the insulation board joint is on the third column section.

Optionally, an annular groove is formed in the outer peripheral surface of the third column section, the insulating plate is provided with a through hole for the pole to penetrate through, the inner wall of the through hole extends towards the pole to form a clamping protrusion, and the clamping protrusion is clamped in the annular groove.

Optionally, the protruding portion further has a second mounting hole and a liquid injection hole, the cover plate further includes an explosion-proof structure, the explosion-proof structure is mounted at the second mounting hole, and the liquid injection hole is disposed on one side of the first mounting hole, which is far away from the second mounting hole.

The utility model also provides a battery, it includes: a housing having an opening at one side; a pole core disposed in the case; the cover plate is arranged at the opening.

The utility model also provides a group battery, it includes: the battery is described above.

Optionally, the number of the batteries is at least two, the at least two batteries are electrically connected through a bus bar, and the bus bar is arched to provide deformation allowance.

The utility model has the advantages of it is following:

1. through setting up flat plate portion and utmost point post and being connected with two utmost point ears of utmost point core respectively, the monopole post design of apron has been realized, only remain an utmost point post, flat plate portion has the function of another utmost point post concurrently, flat plate portion is direct to be connected with external power source, thereby the spare part quantity of apron has been reduced, simplify assembly process, and the production cost is reduced, and, the cavity that forms through the below of bellying separates bellying and utmost point core, effectively prevent that utmost point core and bellying from taking place the short circuit, simple structure and effectual.

2. Sealing insulator compromises sealed and insulating function, compares with the apron among the prior art, the apron that this embodiment provided cancels the insulator between utmost point post and the apron to the quantity of sealing insulator is one, has further reduced the spare part quantity of apron, thereby reduction in production cost.

3. The fixed part is formed by the outside extension in surface of top cap, top cap and fixed part integrated into one piece promptly, install seal insulation in first mounting hole, seal insulation encloses to be located between utmost point post and the top cap in the outside of utmost point post, seal insulation and fixed part cooperation, after first mounting hole is packed into to utmost point post, the fixed part becomes buckle structure and then fixes utmost point post to the direction bending type of utmost point post, seal insulation hugs closely the surface of utmost point post along with the buckling of fixed part, make electric insulation between utmost point post and the top cap when sealed, the buckle structure of fixed part bending type, need not extra mounting alright with fixing on the top cap with utmost point post firm, the subassembly is too much when effectively having solved among the prior art utmost point post and top cap assembly, make assembly process complicated, problem with high costs.

4. The limiting surface is suitable for limiting the pole, the upper hole section and the lower hole section effectively limit horizontal displacement of the pole, the limiting surface limits vertical upward displacement of the pole, and the electric pole is simple in structure and convenient to machine.

5. The first post section of utmost point post and the last hole section phase-match of first mounting hole, the second post section of utmost point post and the lower hole section phase-match of first mounting hole, the fitting surface of second post section and the spacing face phase-match of connecting hole section and lower hole section, the gas tightness has been guaranteed to the laminating of seal insulation on the fitting surface of utmost point post and first mounting hole, makes its sealed effect better.

6. The liquid injection hole and the explosion-proof structure are isolated by the pole, so that the problem that electrolyte pollutes the explosion-proof structure when liquid is injected and leaked is avoided, and the safety of the battery is improved. The liquid injection hole is positioned on the convex part, so that the situation that the internal gas is sealed by the electrolyte and the air in the battery is not thoroughly exhausted when the liquid injection and the vacuum pumping are performed can be prevented; the explosion-proof structure is also positioned on the protruding part, so that the smoothness of an exhaust gas path is guaranteed when thermal runaway occurs.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 shows a schematic structural diagram of a cover plate according to a first embodiment of the present invention;

FIG. 2 shows an exploded view of the cover plate of FIG. 1;

FIG. 3 showsbase:Sub>A schematic cross-sectional view along line A-A of FIG. 1;

FIG. 4 shows a schematic cross-sectional view along line B-B of FIG. 1;

FIG. 5 shows an enlarged schematic view at A in FIG. 4;

fig. 6 is a schematic structural diagram of a cover plate of the first embodiment of the present invention before press-fitting;

FIG. 7 shows an enlarged schematic view at B in FIG. 6;

fig. 8 shows a schematic structural diagram of the cover plate after press-fitting according to the first embodiment of the present invention;

FIG. 9 shows an enlarged schematic view at C in FIG. 8;

fig. 10 is a schematic structural diagram of a cover plate according to a second embodiment of the present invention;

fig. 11 shows a schematic structural diagram of a cover plate according to a third embodiment of the present invention;

FIG. 12 shows a cross-sectional schematic view of FIG. 11;

fig. 13 shows an exploded schematic view of a battery of an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a series battery pack according to an embodiment of the present invention;

FIG. 15 shows the exploded view of FIG. 14;

fig. 16 shows a schematic structural diagram of a parallel battery pack according to an embodiment of the present invention;

FIG. 17 shows an enlarged schematic view at D in FIG. 16;

fig. 18 shows a schematic structural diagram of a bus bar according to an embodiment of the present invention.

Description of reference numerals:

10. a pole column; 101. a first column section; 102. a second column section; 103. a third column section; 20. a top cover; 201. a boss portion; 202. a flat plate portion; 203. a cavity; 21. a first mounting hole; 211. an upper bore section; 212. a lower bore section; 22. a fixed part; 23. a second mounting hole; 24. a liquid injection hole; 25. a recessed portion; 30. sealing the insulating member; 50. an insulating plate; 51. clamping the protrusions; 52. a through hole; 61. a first transfer tab; 62. a second patch; 70. a bus bar; 701. a conductive strip; 702. an insulating sleeve; 71. a first bus bar; 72. a second bus bar; 73. a third bus bar; 80. a battery; 81. a pole core; 82. a housing; 83. a bottom support sheet; 84. a first insulating film; 85. a second insulating film; 86. and (6) a top patch.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example one

As shown in fig. 1 to 9, the cover plate of the present embodiment includes: the top cover 20 is provided with a flat plate part 202 and a protruding part 201, the upper surface of the protruding part 201 is higher than the upper surface of the flat plate part 202, the flat plate part 202 is suitable for being connected with a first pole lug of the pole core 81, a first mounting hole 21 is formed in the protruding part 201, and a cavity 203 is formed below the protruding part 201 to separate the protruding part 201 from the pole core 81; the pole 10 is located in the first mounting hole 21 and is connected with the boss 201 in an insulated manner, and the pole 10 is suitable for being connected with the second pole ear of the pole core 81. The first tab may be a positive tab of the pole core 81, or may be a negative tab, when the first tab is the positive tab, the second tab is the negative tab, and when the first tab is the negative tab, the second tab is the positive tab, preferably, the flat plate portion 202 is connected to the positive tab, and the pole 10 is connected to the negative tab; when the first tab is a positive tab and the second tab is a negative tab, one end of the flat plate portion 202 away from the pole core 81 is electrically connected to a positive electrode of an external power supply, and one end of the pole 10 away from the pole core 81 is electrically connected to a negative electrode of the external power supply, wherein the upper surface of the flat plate portion 202 can be directly welded to the bus bar 70, the upper surface of the pole 10 can be welded to the bus bar 70, and the bus bar 70 is connected to the power supply; it can be understood that, when the first tab is a negative tab and the second tab is a positive tab, the end of the flat plate 202 away from the pole core 81 is electrically connected to the negative electrode of the external power source, and the end of the pole 10 away from the pole core 81 is electrically connected to the positive electrode of the external power source, it should be noted that, since the pole 10 is connected to the protrusion 201 in an insulated manner, the pole 10 is insulated from the flat plate 202, and therefore, a short circuit does not occur between the pole 10 and the flat plate 202. Wherein, up and down refer to the directions of "up and down" indicated by the arrows in fig. 3.

Use the apron of this embodiment, be connected with two utmost points ears of utmost point core 81 respectively through setting up flat plate portion 202 and utmost point post 10, the monopole post design of apron has been realized, only remain an utmost point post, flat plate portion 202 has the function of another utmost point post concurrently, flat plate portion 202 is direct to be connected with external power source, thereby the spare part quantity of apron has been reduced, the assembly process is simplified, the production cost is reduced, and, cavity 203 through the below formation of bellying 201 separates bellying 201 and utmost point core 81, effectively prevent utmost point core 81 and bellying 201 from taking place the short circuit, simple structure and effectual.

Preferably, the cover plate further includes an adapter plate, the adapter plate is used for connecting the tab of the pole core 81 with the cover plate, a side area of the adapter plate is used for welding with the tab of the pole core 81, a central area of the adapter plate is used for welding with the flat plate portion 202 or the pole 10, specifically, the adapter plate includes a first adapter plate 61 and a second adapter plate 62, the first adapter plate 61 is used for connecting the first tab with the flat plate portion 202, and the second adapter plate 62 is used for connecting the second tab with the pole 10.

In this embodiment, the cover plate further includes: and the sealing insulating piece 30 is installed in the first installation hole 21 and surrounds the outside of the pole 10, so that the protruding part 201 and the pole 10 are insulated and sealed, and the pole 10 and the protruding part 201 are prevented from being short-circuited. Sealing insulator 30 compromises sealed and insulating function, compares with the apron among the prior art, the apron that this embodiment provided cancels the insulator between utmost point post 10 and the apron to the quantity of sealing insulator 30 is one, has further reduced the spare part quantity of apron, thereby reduction in production cost.

Preferably, the first mounting hole 21, the pole post 10 and the sealing insulator 30 are rectangular with rounded corners, so that the torque resistance is improved, and the cross-sectional area of the pole post 10 is increased to improve the overcurrent capacity.

Preferably, the post 10 is a negative pole, the negative pole adopts a copper-aluminum composite mode, laser welding of the same material is facilitated, the lower portion of the post is made of copper and is welded with the negative pole adapter plate (made of copper), the upper portion of the post is made of aluminum, the aluminum end face can be welded with the bus bar 70, the sealing insulating part 30 plays a role in sealing after being compressed, contact between the copper-aluminum composite face of the post 10 and electrolyte is isolated, and electrochemical corrosion of a copper-aluminum composite interface is avoided.

In this embodiment, a bendable fixing portion 22 is formed by extending the surface of the protrusion 201 outward, and the fixing portion 22 is suitable for bending toward the pole 10 to form a snap-fit structure to fix the pole 10. The fixed part 22 is formed by the surface of top cap 20 outwards extending, namely top cap 20 and fixed part 22 integrated into one piece, install the seal insulating part 30 in first mounting hole 21, the seal insulating part 30 encloses the outside of establishing at utmost point post 10, and be located between utmost point post 10 and the top cap 20, seal insulating part 30 and the cooperation of fixed part 22, after utmost point post 10 packs into first mounting hole 21, fixed part 22 forms buckle structure to the direction bending of utmost point post 10 and then fixes utmost point post 10, seal insulating part 30 hugs closely the surface of utmost point post 10 along with the bending of fixed part 22, make electric insulation between utmost point post 10 and the top cap 20 when sealed, the buckle structure that fixed part 22 bending type formed, need not extra mounting alright fix on top cap 20 with utmost point post 10, the subassembly is too many when effectively having solved among the prior art when utmost point post and top cap assembly, make the assembly process complicated, problem with high costs.

Specifically, the material and the specific structure of the top cover 20 are not limited, and the use requirement can be met, and the position and the specific form of the first mounting hole 21 are correspondingly matched according to the structure and the mounting position of the pole 10.

In this embodiment, the fixing portion 22 is formed by extending the lower surface of the top cap 20 downward to fix the lower portion of the pole post 10, and the fixing portion 22 and the top cap 20 are integrally designed, so that the process of fixing the fixing portion 22 on the top cap 20 is omitted, the process is simplified, and the cost is reduced. Wherein, the lower surface refers to the surface along the direction of "lower" indicated by the arrow in fig. 3, and after the top cover 20 is assembled with the case of the battery, the lower surface of the top cover 20 is the surface of the side of the top cover 20 facing the pole piece inside the case.

In this embodiment, first mounting hole 21 includes last hole section 211, down-hole section 212 and connects the spacing face of last hole section 211 and down-hole section 212, the aperture of last hole section 211 is less than the aperture of down-hole section 212, utmost point post 10 has the fitting surface that corresponds with spacing face, spacing face is suitable for carries on spacingly to utmost point post 10, last hole section 211 has effectively restricted utmost point post 10 horizontal displacement with down-hole section 212, the vertical ascending displacement of utmost point post 10 has been restricted to spacing face, moreover, the steam generator is simple in structure, and the processing is convenient. It will be appreciated that the first mounting hole 21 may also be provided with more hole segments, which are able to receive the pole 10 and fix its position. Wherein the vertical direction refers to a "vertical direction" indicated by an arrow in FIG. 3 "

Specifically, the structure and size of the upper hole section 211 and the lower hole section 212 match the structure of the seal insulator 30 and the pole post 10, and the limiting surface connecting the upper hole section 211 and the lower hole section 212 may be a horizontal surface or a conical surface. Preferably, the limiting surface connecting the upper hole section 211 and the lower hole section 212 is a horizontal surface, and is uniformly stressed and convenient to process.

In this embodiment, utmost point post 10 is including the first post section 101 and the second post section 102 that set up from top to bottom, the external diameter of first post section 101 is less than the external diameter of second post section 102, the upper surface formation fitting surface of second post section 102, fixed part 22 is buckled the back, sealed insulating part 30 butt is on the lower surface of second post section 102, the first post section 101 of utmost point post 10 and the last hole section 211 phase-match of first mounting hole 21, the second post section 102 of utmost point post 10 and the lower hole section 212 phase-match of first mounting hole 21, the fitting surface of second post section 102 and the spacing face phase-match who connects last hole section 211 and lower hole section 212, sealed insulating part 30 laminates on the fitting surface of utmost point post 10 and first mounting hole 21, the gas tightness has been guaranteed, make its sealed effect better.

In this embodiment, the cover plate further includes: insulation board 50, insulation board 50 sets up the lower surface at bellying 201, utmost point post 10 is still including the third column section 103 that is located second column section 102 below, and the external diameter of third column section 103 is less than the external diameter of second column section 102, and insulation board 50 joint is on third column section 103, and fixed part 22 is buckled the back and is aligned with the lower surface of third column section, and insulation board 50 is used for preventing utmost point core 81 and bellying 201 from taking place the short circuit, promotes the security of battery.

In this embodiment, be equipped with the ring channel on the periphery of third post section 103, insulation board 50 has the through-hole 52 that supplies utmost point post to wear to establish, and the inner wall of through-hole 52 extends to utmost point post 10 and forms joint arch 51, and joint arch 51 joint is in the ring channel, and the joint structure assembly is simple, firm in connection and reliable and stable.

In this embodiment, the projection 201 further has a second mounting hole 23 and a pour hole 24, and the lid plate further includes an explosion-proof structure mounted at the second mounting hole 23, and the pour hole 24 is provided on the side of the first mounting hole 21 away from the second mounting hole 23. Specifically, as shown in fig. 1, the liquid injection hole 24 is formed in one side of the first mounting hole 21 on the protruding portion 201 close to the flat plate portion 202, the second mounting hole 23 is formed in one side of the first mounting hole 21 on the protruding portion 201 away from the flat plate portion 202, and the liquid injection hole 24 is separated from the middle pole 10 of the explosion-proof structure, so that the problem that electrolyte pollutes the explosion-proof structure during liquid injection and leakage is avoided, and the safety of the battery is improved. The liquid injection hole 24 is positioned on the bulge part 201, so that the situation that the internal gas is sealed by the electrolyte and the air in the battery is not thoroughly exhausted when liquid injection and vacuum pumping are carried out can be prevented; the explosion-proof structure is also positioned on the bulge part 201, which is beneficial to ensuring smooth air path of exhaust when thermal runaway occurs. It can be understood that the insulating plate 50 is further provided with a second through hole having the same shape as the second mounting hole 23 at a position corresponding to the second mounting hole 23, so as to ensure the communication between the second mounting hole 23 and the inside of the battery; the insulating plate 50 is also provided with a third through hole having the same shape as the pour hole 24 at a position corresponding to the pour hole 24 to ensure communication between the pour hole 24 and the battery interior, i.e., the portion of the internal cavity formed by assembling the lid plate and the case 82.

Specifically, the explosion-proof structure comprises an explosion-proof membrane and an explosion-proof valve, the shape of the explosion-proof structure is matched with the structure of the second mounting hole 23, and the explosion-proof structure is arranged on the cover plate, so that the safety of the battery is improved.

Preferably, the cover plate further comprises a top patch 86, the top patch 86 is arranged above the top cover 20 and used for protecting the top cover 20, the top patch 86 and the pole 10, the second mounting hole 23, the liquid injection hole 24 and the two-dimensional code portion on the top cover 20 are provided with corresponding holes, wherein the two-dimensional code portion is printed with a two-dimensional code of the battery, and the battery is conveniently identified.

Example two

As shown in fig. 10, the difference between the cover plate of the second embodiment and the cover plate of the first embodiment is that the second mounting holes 23 and the liquid injection holes 24 are arranged at different positions, specifically, the liquid injection holes 24 are arranged at the side of the first mounting holes 21 on the protrusion 201 away from the flat plate portion 202, and the second mounting holes 23 are arranged at the side of the first mounting holes 21 on the protrusion 201 close to the flat plate portion 202, so that the liquid injection holes 24 and the explosion-proof structure can be isolated by the posts 10, and the problem that the electrolyte pollutes the explosion-proof structure during liquid injection and leakage can be avoided.

EXAMPLE III

As shown in fig. 11 to 12, the difference between the cover plate of the third embodiment and the first embodiment is that the flat plate portion 202 and the protruding portion 201 are arranged differently, specifically, the third embodiment adopts a partially recessed manner, the top cover 20 is formed with a recessed portion 25, the recessed portion 25 corresponds to the flat plate portion 202 of the first embodiment and is used for connecting the positive electrode tab, the non-recessed portion is raised upward relative to the recessed portion 25, and corresponds to the protruding portion 201 of the first embodiment and is used for mounting the electrode post 10, and the cavity 203 can be formed to separate the non-recessed portion of the top cover 20 from the electrode core 81, so as to prevent the electrode core 81 and the protruding portion 201 from being short-circuited.

As shown in fig. 13, the present embodiment also provides a battery, which includes: a shell 82, a pole core 81 and the cover plate, wherein one side of the shell 82 is provided with an opening; the pole piece 81 is disposed in the housing 82; the cover plate is arranged at the opening.

Preferably, the battery further comprises a bottom supporting sheet 83, a first insulating film 84 and a second insulating film 85, wherein the bottom supporting sheet 83 is arranged at the bottom of the shell 82 and is positioned below the pole core 81 and used for ensuring that the pole core 81 is insulated from the shell 82; the first insulating film 84 wraps the outside of the pole core 81, the second insulating film 85 wraps the outside of the case 82, the first insulating film 84 is preferably a mylar film (mylar film), the second insulating film 85 is preferably a blue film, and both of the two are insulating materials and have a good insulating effect.

Specifically, the assembly process of the cover plate is as follows: the top cover 20 is punched → the sealing insulator 30 is installed → the pole 10 is installed → the flanging is pressed and installed → the insulating plate 50 is clamped and connected. The pole 10 is matched with the top cover 20 and fixed in a press-fitting mode, welding and injection molding are omitted, the assembly process of the top cover 20 is simplified, and cost reduction is facilitated.

As shown in fig. 14 to 18, the present embodiment also provides a battery pack, which includes: the battery 80 described above.

In this embodiment, the number of the batteries 80 is at least two, at least two batteries 80 are electrically connected through the bus bar 70, and the bus bar 70 is configured in an arch shape to provide a deformation allowance, so that when two adjacent batteries are displaced relatively, a buffer effect is achieved to a certain extent, and the stress applied during grouping and using is reduced.

Preferably, the bus bar 70 includes a conductive strip 701 and an insulating sleeve 702, wherein the insulating sleeve 702 is sleeved on the middle portion of the conductive strip 701, and plays a certain role in safety protection by coating an insulating material.

Fig. 14 to 15 are schematic structural diagrams of a series battery pack, two adjacent batteries are connected through a first bus bar 71, one end of the first bus bar 71 is connected with the negative electrode of a first battery, and the other end is connected with the positive electrode of a second battery, so that the series connection of the battery pack is realized.

Fig. 16 to 17 are schematic structural diagrams of parallel battery packs, the second bus bar 72 is used for connecting the flat plate portions 202 of two adjacent batteries to realize the connection of the positive poles of the batteries of the adjacent battery packs, and the third bus bar 73 is used for connecting the poles 10 of the batteries to realize the connection of the negative poles of the batteries of the battery packs, so as to realize the parallel connection of the battery packs.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

1. the manufacturing cost of the cover plate can be reduced by adopting a single-pole column structure;

2. the sealing insulator 30 has both sealing and insulating functions, so that the cover plate cost can be further reduced;

3. the assembly process of the cover plate is simple (the top cover 20 is punched → the sealing insulating part 30 is installed → the pole 10 is installed → the press-fitting flanging → the insulating plate 50 is clamped), the welding and injection molding processes of the mainstream process are avoided, and the cost is reduced;

4. the liquid injection hole 24 on the top cover 20 is isolated from the middle of the explosion-proof structure by the pole 10, so that the problem that the explosion-proof structure is polluted by electrolyte during liquid injection and leakage is solved;

5. the liquid injection hole 24 is positioned on the convex part 201 of the cover plate, so that the situation that the internal gas is sealed by the electrolyte and the air in the battery is not completely exhausted when liquid injection and vacuum pumping are performed can be prevented;

6. the explosion-proof structure is also positioned at the convex part 201 of the cover plate, so that the gas path for exhausting is smooth when thermal runaway occurs;

7. the sealing insulating piece 30 extends outwards from the upper part of the top cover 20, so that the insulating distance of positive and negative electrodes is increased, and the risk of short circuit of the positive and negative electrodes is reduced;

8. the bottom of the sealing insulating part 30 extends inwards, and the extending part exceeds the lower flanging, so that the risk of short circuit between the lower flanging and the pole 10 is reduced;

9. the lower flanging of the fixed part keeps a certain gap with the pole, and an insulating plate 50 is clamped in the gap to physically isolate the positive pole and the negative pole;

10. the insulating plate 50 is clamped in the groove at the end part of the pole for clamping and fixing, and the assembly is simple and the connection is firm;

11. the middle part of the pole 10 is provided with a boss, the boss and the wrapped sealing insulating piece 30 are restrained between an upper flange and a lower flange of the fixing part 22 on the cover plate together, and the boss can bear inward and outward thrust to a certain degree;

12. the pole 10 and the matching parts thereof are integrally designed into a square round angle, so that the anti-rotation function is realized, and the stability of the structure is improved;

13. the pole 10 and the matching parts thereof are integrally of square structures, so that the welding area is increased, and the overcurrent capacity of the pole can be improved;

14. the middle part of the bus bar 70 is arched, so that a certain buffer effect can be achieved, and the stress borne by the bus bar in the grouping and using processes can be reduced;

15. the middle part of the bus bar 70 is coated with an insulating material, so that a certain safety protection effect is achieved.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.

Claims (12)

1. A cover plate, comprising:

the top cover (20) is provided with a flat plate part (202) and a protruding part (201), the upper surface of the protruding part (201) is higher than the upper surface of the flat plate part (202), the flat plate part (202) is suitable for being connected with a first pole lug of a pole core (81), a first mounting hole (21) is formed in the protruding part (201), and a cavity (203) is formed below the protruding part (201) to separate the protruding part (201) from the pole core (81);

the pole column (10) is located in the first mounting hole (21) and is in insulation connection with the protruding portion (201), and the pole column (10) is suitable for being connected with a second pole ear of the pole core (81).

2. The cover sheet of claim 1, further comprising: and the sealing insulating piece (30) is arranged in the first mounting hole (21) and is enclosed outside the pole (10) so as to insulate and seal the bulge part (201) and the pole.

3. The cover plate according to claim 2, characterized in that a bendable fixing portion (22) is formed by extending the surface of the protruding portion (201) outwards, and the fixing portion (22) is adapted to be bent towards the pole (10) to form a snap-fit structure for fixing the pole (10).

4. The cover plate according to claim 3, wherein the fixing portion (22) is formed by extending downward from the lower surface of the top cap (20) to fix the lower portion of the pole (10).

5. The cover plate of claim 4, wherein the first mounting hole (21) comprises an upper hole section (211), a lower hole section (212) and a limiting surface connecting the upper hole section (211) and the lower hole section (212), the aperture of the upper hole section (211) is smaller than that of the lower hole section (212), the pole (10) has a matching surface corresponding to the limiting surface, and the limiting surface is suitable for limiting the pole (10).

6. The cover plate according to claim 5, characterized in that the pole (10) comprises a first column section (101) and a second column section (102) arranged one above the other, the outer diameter of the first column section (101) being smaller than the outer diameter of the second column section (102), the mating surface being formed on the upper surface of the second column section (102), and the sealing insulator (30) abutting against the lower surface of the second column section (102) after the fixation (22) is bent.

7. The cover sheet of claim 6, further comprising: insulating board (50), insulating board (50) set up the lower surface of bellying (201), utmost point post (10) still include and are located third post section (103) of second post section (102) below, the external diameter of third post section (103) is less than the external diameter of second post section (102), insulating board (50) joint is in on third post section (103).

8. The cover plate according to claim 7, wherein an annular groove is formed in the outer peripheral surface of the third column section (103), the insulating plate (50) is provided with a through hole (52) for the pole (10) to penetrate through, the inner wall of the through hole (52) extends towards the pole to form a clamping protrusion (51), and the clamping protrusion (51) is clamped in the annular groove.

9. The lid plate according to any one of claims 1 to 8, characterized in that the boss (201) further has a second mounting hole (23) and a pour hole (24), the lid plate further comprising an explosion-proof structure mounted at the second mounting hole (23), the pour hole (24) being provided at a side of the first mounting hole (21) remote from the second mounting hole (23).

10. A battery, comprising:

a housing (82) having an opening on one side;

a pole piece (81) disposed in the housing (82);

the cover sheet of any one of claims 1-9 disposed at the opening.

11. A battery pack, comprising: the battery (80) of claim 10.

12. The battery pack according to claim 11, wherein the number of the cells (80) is at least two, at least two of the cells (80) are electrically connected by a bus bar (70), and the bus bar (70) is configured in an arch shape to provide a deformation margin.

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