CN218602687U - Battery, battery module and battery pack - Google Patents

Abstract

The utility model relates to a battery technology field especially relates to a battery, battery module and battery package. The utility model provides a battery includes casing and negative pole and converges the dish, and wherein, the negative pole converges the dish and sets up in the inside of casing to before the casing seals, the negative pole converges the dish at the inside and the casing welded connection of casing. This setting mode can separate the negative pole converge the seal with the outside environment of battery with the welding of casing to avoid welding the seal and take place to corrode in humid environment, guaranteed the security and the life of battery. The utility model provides a battery module and battery package have avoided welding the seal to take place to corrode in humid environment through using above-mentioned battery, have guaranteed the security and the life of battery module and battery package.

Description

Battery, battery module and battery pack

Technical Field

The utility model relates to a battery technology field especially relates to a battery, battery module and battery package.

Background

For a battery user, the large cylindrical battery can save the number of parts and can also improve the production efficiency and the assembly efficiency of the battery. The negative pole of cylinder battery converges dish and casing and generally is formed by steel preparation, in battery production process, needs to realize the electric connection between casing and the negative pole converges dish through the welded mode, but steel welding back surface can form welds the seal, welds the difference that has the material with the steel substrate of seal, and its self chemical potential is different, under the condition that electrolyte exists or in humid environment, takes place galvanic corrosion easily. During storage and transportation of the battery, if a humid environment exists, a prerequisite condition of galvanic corrosion is formed, the solder mark must be corroded, and once the solder mark is corroded, potential risks are caused to the overall safety and service life of the battery.

Therefore, it is desirable to provide a battery, a battery module and a battery pack to solve the above problems.

SUMMERY OF THE UTILITY MODEL

A first object of the utility model is to provide a battery to the welding seal that converges negative pole dish and casing is isolated with external environment, improves the security and the life of battery.

A second object of the present invention is to provide a battery module, which is capable of preventing the solder mark from being corroded, thereby improving the safety and the service life of the battery module.

A third object of the present invention is to provide a battery pack, which is prevented from being corroded by the solder mark, and which has improved safety and service life.

To achieve the purpose, the utility model adopts the following technical proposal:

a battery, comprising:

a housing; and

the negative pole converges the dish, sets up in the inside of casing to before the casing seals, the negative pole converges the dish in the inside of casing with casing welded connection.

As the preferred scheme, the battery still includes the sealing member, the end of sealing of casing is concave in proper order and is equipped with first slot rolling and the second slot rolling that are connected, first slot rolling orientation the inside of casing is buckled, the second slot rolling orientation the outside of casing is buckled, first slot rolling with negative pole converges dish welded connection, the sealing member holding is in the second slot rolling, in order the shutoff the opening of casing and with first slot rolling with the welding seal shutoff of negative pole converge dish is in the inside of casing.

As a preferred scheme, the first rolling groove comprises a first rolling groove edge, a first bending groove wall and a second rolling groove edge which are sequentially connected, and the second rolling groove edge is opposite to the first rolling groove edge;

the second slot rolling comprises a third slot rolling edge, a second bending slot wall and a fourth slot rolling edge which are connected in sequence, the third slot rolling edge is connected with the second slot rolling edge, the third slot rolling edge is arranged opposite to the first slot rolling edge, the fourth slot rolling edge is arranged opposite to the third slot rolling edge, and the sealing piece is accommodated between the third slot rolling edge and the fourth slot rolling edge.

Preferably, the first bending groove wall is connected with the negative pole confluence disc in a welding mode.

Preferably, a welding step is arranged on the edge of the second rolling groove, and the negative pole confluence plate is connected to the welding step in a lap-joint welding mode.

Preferably, the depth H of the welding step is greater than or equal to the height of a welding mark formed after the negative pole bus plate is welded.

Preferably, the battery further comprises:

the first sealing ring is coated on the periphery of the sealing piece and clamped between the sealing piece and the second rolling groove.

Preferably, the first sealing ring extends towards the center of the shell to form a protection tongue, the protection tongue is located between the sealing piece and the welding step, and welding marks formed after the protection tongue and the negative bus plate are welded are arranged at intervals.

Preferably, the welding seal formed by welding the negative bus bar and the first rolling groove is designed not to penetrate through the welding position of the first rolling groove.

Preferably, the sealing piece is an explosion-proof piece.

Preferably, the negative pole confluence plate comprises:

a tab connecting piece; and

and the shell connecting piece is connected with the lug connecting piece and is welded and connected with the first rolling groove.

Preferably, the housing connecting piece is provided with buffer corrugations.

As preferred scheme, the battery still includes electric core, electric core sets up inside and being located the negative pole converges the top of dish, utmost point ear connecting piece with the electricity core electricity is connected, spaced apart on utmost point ear connecting piece's the periphery wall is equipped with a plurality of electric cores and dodges the groove, adjacent two electricity core dodges to press from both sides between the groove and establishes and is formed with utmost point ear and stretches out the end, and utmost point ear stretch out the end with be formed with the isolated space between the electricity core, and every electricity core dodges the groove and keeps away from one side of electricity core is all just to being provided with the casing connecting piece.

As a preferred scheme, the peripheral wall of utmost point ear connecting piece is towards keeping away from the direction punching press of electricity core is buckled in order to form the casing connecting piece, so that the casing connecting piece orientation forms in the direction of electricity core the groove is dodged to the electricity core.

Preferably, a reinforcing protrusion is formed on one side of the tab connecting piece facing the sealing piece, and the height of the reinforcing protrusion facing the direction close to the sealing piece is lower than the height of the shell connecting piece facing the direction close to the sealing piece.

A battery module comprises the battery.

A battery pack comprises at least one battery module.

The utility model has the advantages that:

the utility model provides a battery, through before sealing at the casing, converge the negative pole and coil the inside and casing welded connection of casing, can converge the negative pole and coil the welding seal of casing and completely cut off with the outside environment of battery to avoid welding the seal and take place to corrode in humid environment, guaranteed the security and the life of battery.

The utility model provides a battery module through using above-mentioned battery, has avoided welding the seal to take place to corrode in humid environment, has guaranteed battery module's security and life.

The utility model provides a battery package through using above-mentioned battery module, has avoided welding the seal and has taken place to corrode in humid environment, has guaranteed the security and the life of battery package.

Drawings

Fig. 1 is an exploded view of a battery according to an embodiment of the present invention;

fig. 2 is a first cross-sectional view of a battery according to a first embodiment of the present invention;

fig. 3 is a second cross-sectional view of a battery according to a first embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at C;

FIG. 5 is an enlarged view of a portion of FIG. 2 at A;

fig. 6 is a first schematic structural diagram of a negative bus bar according to a first embodiment of the present invention;

fig. 7 is a schematic structural diagram of a negative pole confluence plate according to a first embodiment of the present invention;

fig. 8 is a cross-sectional view of a battery provided in the second embodiment of the present invention;

fig. 9 is a partial enlarged view at B in fig. 8.

In the figure:

1. a negative pole confluence plate; 11. a tab connecting piece; 111. the cell evades the groove; 112. the tab extends out of the end; 1121. chamfering; 113. a reinforcing protrusion; 114. avoiding holes; 12. a housing connector; 121. buffering ripples;

2. a housing; 21. a first roll groove; 211. a first raceway edge; 212. a second roll groove edge; 2121. welding a step; 213. a first bending groove wall; 22. a second roll groove; 221. a third groove side; 222. a fourth roll groove edge; 223. the wall of the second bending groove;

3. a closure member;

4. a first seal ring; 41. a protective tongue;

5. an electric core; 51. an annular groove;

6. a terminal post; 61. a pole section; 611. connecting grooves; 62. sealing and flanging; 621. a flanging gap; 622. an annular reinforcing rib; 63. a pole plate portion; 64. an annular avoidance groove;

7. applying a plastic part; 71. a containing groove; 711. a second through hole;

8. a plastic part is put; 9. a second seal ring; 10. a positive pole collector plate; 101. and inserting the projection.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

As shown in fig. 1 and fig. 2, this embodiment provides a battery, mainly refer to a large cylindrical battery, this battery mainly includes electric core 5, negative pole converges dish 1, anodal dish 10 that converges, terminal utmost point post 6 and casing 2, wherein, electric core 5, negative pole converges dish 1 and anodal dish 10 that converges and all sets up in the inside of casing 2, anodal dish 10 that converges sets up on the up end of electric core 5 and is connected with the anodal ear electricity of electric core 5, negative pole converges that the laminating of dish 1 is on the lower terminal surface of electric core 5 and is connected with the negative pole ear electricity of electric core 5, negative pole converges dish 1 and still realizes the electricity with casing 2 welding and is connected, terminal utmost point post 6 sets up on anodal dish 10 that converges and is connected with anodal dish 10 that converges, first through hole has been seted up on the top cap of casing 2 up end, terminal utmost point post 6 can pass through the top cap that first through hole stretches out casing 2.

In order to ensure that the connection between the terminal post 6 and the positive pole convergence plate 10 is more stable, as shown in fig. 2, a connecting groove 611 is formed in one side, facing the positive pole convergence plate 10, of the terminal post 6, an inserting protrusion 101 is arranged on one side, facing the terminal post 6, of the positive pole convergence plate 10, and the inserting protrusion 101 is inserted into the connecting groove 611, so that the electric connection between the terminal post 6 and the positive pole convergence plate 10 is realized, and the stability and the reliability of the connection between the terminal post 6 and the positive pole convergence plate 10 are further improved.

In order to ensure the insulation property between the terminal post 6 and the housing 2, as shown in fig. 1 to fig. 3, the battery further includes an upper plastic part 7, a lower plastic part 8 and a second sealing ring 9, wherein the upper plastic part 7 is placed on the top cover of the upper end surface of the housing 2, the terminal post 6 passes through the first through hole of the top cover of the housing 2 and the upper plastic part 7 and then is pressed against the upper plastic part 7 by the outward bending flanging, so that the terminal post 6 firmly wraps the upper plastic part 7 and the top cover of the housing 2, thereby achieving the sealing effect, the lower plastic part 8 and the second sealing ring 9 are all sleeved on the periphery of the terminal post 6, the lower plastic part 8 is located between the positive pole collecting tray 10 and the inner wall of the top cover of the housing 2, and the second sealing ring 9 is clamped between the terminal post 6, the first plastic wall of the top cover of the housing 2, the lower plastic part 8 and the inner wall of the top cover of the housing 2, the upper plastic part 7, the second sealing ring 9 and the lower plastic part 8 are mutually matched to completely separate the terminal post 6 from the housing 2, and further ensure the insulation property between the terminal post 6 and the housing 2. In addition, by providing the second seal ring 9, the sealing effect between the terminal post 6 and the housing 2 is further improved.

In this embodiment, the second sealing washer 9 can be integrated into one piece with lower plastic part 8, is not only convenient for process, has also simplified the quantity of part, is convenient for assemble whole battery more.

It should be noted that, in the production and manufacturing process of the battery, the larger the vertical distance between the terminal post 6 and the top cover of the housing 2 is, the larger the insulating medium between the terminal post 6 and the top cover of the housing 2 is, and the safety performance of the battery can be further improved, so that in the existing battery, in order to increase the insulating medium between the terminal post 6 and the top cover of the housing 2 in the vertical direction, the terminal post 6 is usually far higher than the plastic part 7, and the flatness and the attractiveness of the battery are greatly reduced.

In order to solve the above problem, as shown in fig. 3 and 4, the terminal post 6 passes through the first through hole of the top cover of the housing 2 and presses on the upper plastic part 7 by the outward bending and flanging after passing through the upper plastic part 7, and the upper top surface of the terminal post 6 is flush with the upper top surface of the upper plastic part 7, so that the top of the battery is more flat and beautiful, the insulating medium in the vertical direction of the terminal post 6 and the housing 2 is also added, and the safety of the battery is improved.

Specifically, as shown in fig. 4, the accommodating groove 71 is formed on the upper top surface of the upper plastic part 7, the bottom wall of the accommodating groove 71 is provided with a second through hole 711, and the terminal post 6 can pass through the second through hole 711 to be bent outward to form a flange and be pressed against the bottom wall of the accommodating groove 71, so that the upper top surface of the terminal post 6 is flush with the upper top surface of the upper plastic part 7.

Referring to fig. 4, the specific structure of the terminal post 6 will be described, as shown in fig. 4, the terminal post 6 includes a post portion 61, a plate portion 63, and a sealing flange 62, wherein the plate portion 63 is connected to the post portion 61, the plate portion 63 is located below the second sealing ring 9 and the lower plastic part 8, the sealing flange 62 is connected to the plate portion 63 and is disposed opposite to the plate portion 63, the sealing flange 62 surrounds the post portion 61, and the sealing flange 62 is bent outward relative to the post portion 61 and the plate portion 63 and is pressed against the bottom wall of the accommodating groove 71. In the present embodiment, the pole portion 61, the pole plate portion 63, and the sealing flange 62 are integrally formed, so that the manufacturing process of the terminal post 6 is simplified, and the manufacturing cost of the terminal post 6 is reduced. Note that, the pole portion 61 has a connection groove 611 formed on a side facing the positive electrode bus bar 10.

Preferably, as shown in fig. 4, the peripheral wall of the sealing flange 62 is provided with a plurality of flange notches 621 at intervals, when the sealing flange 62 is bent outward relative to the pole piece portion 61 and the pole plate portion 63, the flange notches 621 reduce the tensile deformation force of the peripheral wall of the sealing flange 62 in the bending process, avoid the fracture of the peripheral wall of the sealing flange 62 due to excessive tensile force in the bending process, and ensure the reliability of the sealing flange 62 in the bending process.

Further, as shown in fig. 4, an annular avoiding groove 64 is formed between the sealing flange 62 and the pole portion 61, so that the sealing flange 62 and the pole portion 61 are arranged at an interval, which is more beneficial to bending and flanging the sealing flange 62 outwards relative to the pole portion 61 and the pole plate portion 63.

In this embodiment, as shown in fig. 4, the annular reinforcing rib 622 is disposed at a portion of the sealing flange 62 that is bent outward relative to the pole portion 61 and the pole plate portion 63, so as to further improve the structural strength of the bent portion of the sealing flange 62, prevent the bent portion of the sealing flange 62 from being broken during the bending process, and improve the structural strength of the whole terminal pole 6.

Because the negative pole converges dish 1 and casing 2 and realizes the electricity through the welding and be connected, negative pole converges dish 1 and casing 2 and all is prepared by steel generally, need realize through the welded mode that the electricity between casing 2 and the negative pole converges dish 1 is connected, but steel welding back surface can form welds the seal, welds the seal and has the difference of material with the steel substrate, and its own chemical potential is different, under the condition that electrolyte exists or in humid environment, takes place galvanic corrosion easily. During the storage and transportation of the battery, if a humid environment exists, a prerequisite condition of galvanic corrosion is formed, the solder mark must be corroded, and once the solder mark is corroded, the potential risk is caused to the overall safety and service life of the battery.

In order to solve the above problem, as shown in fig. 5, in the battery provided in this embodiment, before the lower end surface of the casing 2 is sealed, the negative bus bar 1 is welded to the casing 2 inside the casing 2, and the solder marks of the negative bus bar 1 and the casing 2 can be isolated from the environment outside the battery, so that corrosion of the solder marks in a humid environment is avoided, and the safety and the service life of the battery are ensured.

Specifically, as shown in fig. 5, the battery further includes a sealing member 3, a first rolling groove 21 and a second rolling groove 22 connected to each other are sequentially concavely provided at a sealing end of the case 2, wherein the first rolling groove 21 is bent toward the inside of the case 2, the second rolling groove 22 is bent toward the outside of the case 2, the first rolling groove 21 is welded to the negative bus bar 1, and the sealing member 3 is accommodated in the second rolling groove 22 to seal the opening of the case 2 and seal the welding marks of the first rolling groove 21 and the negative bus bar 1 in the inside of the case 2, so as to ensure that the welding marks of the negative bus bar 1 and the case 2 are isolated from the environment outside the battery. By performing the roll-groove arrangement on the sealing end of the housing 2 and accommodating the sealing member 3 in the second roll-groove 22, not only can the sealing member 3 be stably fixed, but also the sealing effect of the sealing end of the housing 2 is greatly improved.

In this embodiment, sealing member 3 is the explosion-proof piece, comes the opening of shutoff casing 2 through setting up the explosion-proof piece, when casing 2 inside pressure was too big, can break through the explosion-proof piece to play the effect of pressure release to casing 2 inside, avoid the danger of explosion to appear in the battery.

Preferably, as shown in fig. 5, the battery further includes a first sealing ring 4, the first sealing ring 4 covers the periphery of the sealing member 3, and the first sealing ring 4 is sandwiched between the sealing member 3 and the second rolling groove 22, so as to further improve the sealing effect of the sealed end of the case 2.

Referring to fig. 5, a specific structure of the first rolling groove 21 and the second rolling groove 22 is described, as shown in fig. 5, the first rolling groove 21 includes a first rolling groove side 211, a first bending groove wall 213, and a second rolling groove side 212 connected in sequence, the second rolling groove side 212 is disposed opposite to the first rolling groove side 211, the second rolling groove 22 includes a third rolling groove side 221, a second bending groove wall 223, and a fourth rolling groove side 222 connected in sequence, the third rolling groove side 221 is connected to the second rolling groove side 212, the third rolling groove side 221 is disposed opposite to the first rolling groove side 211, the fourth rolling groove side 222 is disposed opposite to the third rolling groove side 221, and the sealing member 3 is accommodated between the third rolling groove side 221 and the fourth rolling groove side 222, so that the sealing member 3 can cover a lower side of the third rolling groove side 221, and the first rolling groove 21 can be sealed.

In this embodiment, as shown in fig. 5, the second groove edge 212 is provided with a welding step 2121, and the negative bus bar 1 is lap-welded to the welding step 2121. Through set up welding step 2121 on second slot edge 212 for negative pole converges that dish 1 just can be clear sees the welding seam or the welding overlap joint department of treating the welding when welding with casing 2, has reduced the problem of welding partially welded, has also avoided taking place the problem of rosin joint and welding and has worn, has promoted the process yield, has guaranteed the uniformity of battery quick-charging performance. In addition, the welding step 2121 also serves as a pressing region for the negative bus bar 1 during welding, thereby facilitating the welding operation.

Preferably, as shown in fig. 5, the depth H of the welding step 2121 is greater than or equal to the height of the weld formed after the negative bus bar plate 1 is welded, so that the depth H of the welding step 2121 can accommodate the height of the negative bus bar plate 1 and the weld formed after the welding, and the welded part of the negative bus bar plate 1 is smoother.

Further, as shown in fig. 5, the first sealing ring 4 extends to form a protection tongue 41 toward the center direction of the housing 2, the protection tongue 41 is located between the sealing member 3 and the welding step 2121, and the protection tongue 41 and the welding mark formed after the negative bus bar 1 is welded are arranged at intervals, so that the protection tongue 41 can protect one side of the welding mark, and when the battery is sealed, the stress applied to the welding position by the first sealing ring 4 can be reduced, the welding position is protected from cracking, and the stability and reliability of welding are ensured.

It should be noted that the welding seal formed by welding the negative bus bar 1 and the welding step 2121 is designed not to penetrate through the welding position of the welding step 2121, so that the problem of welding through is avoided, and the process yield is improved.

Referring to fig. 6 and 7, a specific structure of the negative bus bar 1 will be described, as shown in fig. 6 and 7, the negative bus bar 1 includes a tab connector 11 and a housing connector 12, wherein the tab connector 11 is electrically connected to the battery cell 5, the housing connector 12 is connected to the tab connector 11, and the housing connector 12 is lap-welded to the welding step 2121.

Preferably, as shown in fig. 7, the damping corrugation 121 is disposed on the housing connector 12 in a manner that not only ensures the stability of the housing connector 12, but also provides the housing connector 12 with a certain damping elasticity. After the casing connecting piece 12 is welded with the welding step 2121, the compression force generated when the buffer corrugation 121 can effectively absorb the sealing in the battery sealing process is carried out, so that the pressure of the casing 2 on the negative pole bus bar 1 is reduced, the pressure of the negative pole bus bar 1 on the electric core 5 is reduced, and the safety of the battery is improved.

In addition, it should be noted that, in the production and manufacturing process of the battery, especially when the battery is packaged, the first rolling groove 21 at the sealing position of the battery is pressed down, although the casing connecting part 12 has certain buffering elasticity, which can reduce the pressure of the casing 2 on the negative pole confluence plate 1, the casing 2 still can cause certain oppression to the negative pole confluence plate 1, so that the negative pole confluence plate 1 extrudes the battery core 5, and the battery core 5 is relatively fragile, so that the negative pole confluence plate 1 easily causes extrusion damage to the battery core 5, thereby reducing the process yield.

In order to solve the above problem, as shown in fig. 6 and 7, a plurality of cell avoiding grooves 111 are spaced apart from each other on the outer peripheral wall of the tab connection member 11, a tab extending end 112 is formed between two adjacent cell avoiding grooves 111, an isolation space is formed between the tab extending end 112 and the cell 5, and one side of each cell avoiding groove 111 away from the cell 5 is directly opposite to the housing connection member 12. Above-mentioned mode of setting up has reduced the laminating area of 11 peripheries of utmost point ear connecting piece and electric core 5, when encapsulating the battery, has avoided first slot rolling 21 to push down 11 extrusion damage electric cores 5 of utmost point ear connecting piece that lead to, has promoted the process yield.

Preferably, as shown in fig. 6, chamfers 1121 are formed on the corners of the tab protruding end 112 for deburring, so that the appearance of the whole tab connection member 11 is improved, and the sharp points of the tab connection member 11 are prevented from scratching operators.

In the present embodiment, as shown in fig. 5, an annular groove 51 is formed on the outer peripheral wall of the battery cell 5, so that an isolation space is formed between the tab protruding end 112 and the battery cell 5, thereby preventing the tab connecting member 11 from extruding and damaging the battery cell 5.

It should be noted that, in this embodiment, the battery cell avoiding grooves 111 are provided with three, correspondingly, the number of the casing connectors 12 is three, and the casing connectors 12 and the tab extending ends 112 are arranged in a staggered manner along the circumferential direction of the tab connectors 11. In other embodiments, the number of the cell avoiding grooves 111 and the housing connection members 12 may be set as required.

Specifically, the outer peripheral wall of the tab connector 11 is punched and bent in a direction away from the battery cell 5 to form a housing connector 12, so that the housing connector 12 forms a cell avoiding groove 111 in a direction toward the battery cell 5. This setting mode is convenient for process negative pole cylinder manifold 1 for negative pole cylinder manifold 1 integrated into one piece has also improved the structural strength that negative pole cylinder manifold 1.

Preferably, as shown in fig. 6, the side of the tab connection member 11 facing the sealing member 3 is formed with a reinforcing protrusion 113, and the height of the reinforcing protrusion 113 in the direction of approaching the sealing member 3 is lower than the height of the case connection member 12 in the direction of approaching the sealing member 3. Through strengthening protruding 113 that sets up, not only improved the structural strength of negative pole dish 1 of converging to the protruding 113 of strengthening of design can be regarded as the negative pole and converge dish 1 and carry out welded border when laser welding and use. In addition, the height of the reinforcing protrusion 113 in the direction close to the sealing member 3 is lower than the height of the case connecting member 12 in the direction close to the sealing member 3, and the arrangement mode enables the reinforcing protrusion 113 not to abut against the sealing member 3 when the sealing member 3 is installed to seal the case 2, so that the sealing member 3 is prevented from being damaged by abutting pressure, and the explosion precision of the sealing member 3 is ensured.

Further, the reinforcing protrusions 113 are arc-shaped, and a plurality of reinforcing protrusions 113 are provided, and the plurality of reinforcing protrusions 113 are arranged around the tab connection member 11 at intervals in the circumferential direction. In this embodiment, three reinforcing protrusions 113 are provided, and in other embodiments, two, four or more reinforcing protrusions can be provided as required.

Preferably, as shown in fig. 6, an avoiding hole 114 is formed in the center of the circle of the tab connection member 11, the plurality of reinforcing protrusions 113 are arranged at intervals around the circumference of the avoiding hole 114, and the avoiding hole 114 is opposite to the through hole in the middle of the electric core 5, so that a welding tool can sequentially penetrate through the avoiding hole 114 and the through hole in the middle of the electric core 5 to weld and connect the terminal post 6 at the top of the battery and the positive bus plate 10.

The embodiment also provides a battery module, and through using above-mentioned battery, avoided welding the seal to take place to corrode in humid environment, guaranteed battery module's security and life.

The embodiment also provides a battery pack, and through using above-mentioned battery module, avoided welding the seal to take place to corrode in humid environment, guaranteed battery pack's security and life.

Example two

The battery provided by the present embodiment is substantially the same as the first embodiment, and the difference between the battery provided by the present embodiment and the first embodiment is: the welding position of the negative pole confluence plate 1 is different from that of the first rolling groove 21.

As shown in fig. 8 and 9, in the present embodiment, the first groove wall 213 is welded to the case connection member 12 of the negative bus bar 1. And the welding seal formed by welding the shell connecting piece 12 and the first bending groove wall 213 is designed to not penetrate through the welding position of the first bending groove wall 213, so that the thickness of the shell 2 during welding is increased, and the stability and reliability of welding are improved.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. 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. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (14)

1. A battery, comprising:

a housing (2); and

the negative pole current-collecting disc (1) is arranged in the shell (2), the shell (2) is sealed before, the negative pole current-collecting disc (1) is arranged in the shell (2) and connected with the shell (2) in a welding mode, the battery further comprises a sealing piece (3), a first rolling groove (21) and a second rolling groove (22) which are connected are sequentially arranged at the sealing end of the shell (2) in a concave mode, the first rolling groove (21) bends towards the inside of the shell (2), the second rolling groove (22) bends towards the outside of the shell (2), the first rolling groove (21) is connected with the negative pole current-collecting disc (1) in a welding mode, the sealing piece (3) is contained in the second rolling groove (22) to seal the opening of the shell (2) and seal the first rolling groove (21) and the welding seal of the negative pole current-collecting disc (1) in the shell (2), the first rolling groove (21) comprises a first rolling groove (211), a second rolling groove (213) and a second rolling groove (223), a second rolling groove (211) and a second rolling groove (223) and a fourth rolling groove (222) and a second rolling groove (223), third slot side (221) with second slot side (212) are connected, third slot side (221) with first slot side (211) set up relatively, fourth slot side (222) with third slot side (221) set up relatively, sealing member (3) holding is in third slot side (221) with between fourth slot side (222), be provided with welding step (2121) on second slot side (212), negative pole converges dish (1) overlap joint welded connection and is in on welding step (2121).

2. The battery according to claim 1, characterized in that the first bending groove wall (213) is welded to the negative collector plate (1).

3. The battery according to claim 1, wherein the depth H of the welding step (2121) is greater than or equal to the height of a weld mark formed after the negative bus bar (1) is welded.

4. The battery of claim 1, further comprising:

the first sealing ring (4) is coated on the periphery of the sealing piece (3) and clamped between the sealing piece (3) and the second rolling groove (22).

5. The battery according to claim 4, wherein the first sealing ring (4) extends to a central direction of the casing (2) to form a protection tongue (41), the protection tongue (41) is located between the sealing member (3) and the welding step (2121), and the protection tongue (41) is spaced from a welding mark formed after welding with the negative bus bar (1).

6. The battery according to any one of claims 1 to 5, wherein the welding mark formed by welding the negative bus bar (1) and the first rolling groove (21) is designed not to penetrate the welding position of the first rolling groove (21).

7. The battery according to any one of claims 1 to 5, wherein the sealing member (3) is an explosion-proof sheet.

8. The battery according to any one of claims 1 to 5, wherein the negative bus bar (1) comprises:

a tab connection member (11); and

and the shell connecting piece (12) is connected with the lug connecting piece (11) and is connected with the first rolling groove (21) in a welding mode.

9. The battery according to claim 8, characterized in that the housing connection piece (12) is provided with a damping corrugation (121).

10. The battery according to claim 8, wherein the battery further comprises a battery core (5), the battery core (5) is disposed inside the casing (2) and above the negative pole confluence plate (1), the tab connection member (11) is electrically connected with the battery core (5), a plurality of battery core avoiding grooves (111) are spaced on the outer peripheral wall of the tab connection member (11), two adjacent battery core avoiding grooves (111) are sandwiched to form a tab extending end (112), an isolation space is formed between the tab extending end (112) and the battery core (5), and each battery core avoiding groove (111) is far away from one side of the battery core (5) and is just provided with the casing connection member (12).

11. The battery according to claim 10, characterized in that the peripheral wall of the tab connector (11) is stamped and bent away from the battery cell (5) to form the housing connector (12) such that the housing connector (12) forms the cell escape groove (111) in a direction toward the battery cell (5).

12. The battery according to claim 10, characterized in that the side of the tab connection element (11) facing the closure (3) is formed with a reinforcement projection (113), the height of the reinforcement projection (113) facing towards the closure (3) being lower than the height of the housing connection element (12) facing towards the closure (3).

13. A battery module comprising the battery according to any one of claims 1 to 12.

14. A battery pack comprising at least one set of the battery module according to claim 13.

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