CN220021195U - Battery with higher energy density - Google Patents

Abstract

The utility model relates to the technical field of batteries, in particular to a battery with higher energy density. The battery with higher energy density comprises a battery shell, a battery winding core and a battery cover plate; the battery winding core comprises a pole lug and a battery core main body which are connected, the battery core main body is accommodated in the battery shell, and the pole lug extends into the accommodating bulge; the battery cover plate comprises a cover plate main body and a battery pole column, wherein the cover plate main body comprises a horizontal part and a protruding part which are connected, and the protruding part is covered above the accommodating protrusion; the battery pole comprises an external connection part and an internal connection part which are connected, the external connection part is arranged outside the battery shell and is used for being connected with external equipment, the internal connection part is arranged in the battery shell, and the internal connection part extends into the accommodating protrusion in the direction close to the protrusion part; the inner connecting part in the accommodating bulge extends downwards, the lug in the accommodating bulge is connected to the side wall of the extending part of the inner connecting part, the accommodating space of the battery cell main body is improved, the lug is prevented from being bent, and the safety is high.

Description

Battery with higher energy density

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery with higher energy density.

Background

With the development of new energy technology, batteries are widely used by virtue of their own efficient energy storage capability. The battery includes battery case, battery apron and sets up the battery core of rolling up in battery case, and the battery core of rolling up includes electric core main part and utmost point ear, and battery apron lid is established in the top of battery core of rolling up, is provided with battery post on the battery apron, and battery post can be with utmost point ear welded fastening, and then on leading battery post with the electric current of electric core main part, the follow-up charge and discharge operation of electric core main part is convenient for.

In the prior art, in order to ensure the welding effect of the tab and the battery post, the butt joint of the tab and the battery post mainly has two schemes:

as shown in fig. 1, in the first scheme, the tab 21 needs to be bent, the bent tab 21 includes an L-shaped tab horizontal portion and an L-shaped tab vertical portion, and the tab vertical portion is connected with the battery core main body 22, so that the tab horizontal portion is welded with the lower end surface of the battery post 11, and the contact area between the tab 21 and the battery post 11 is increased, thereby improving the welding effect of the tab 21 and the battery post 11. As shown in fig. 2, the second solution needs to connect the tab 21 to the tab 13 at the battery post 11 and one end near the tab 21, and bend and clamp the tab 21 to the tab 13.

However, in both the above two schemes, the tab 21 needs to be bent in the connection manner between the tab 21 and the battery post 11, and the bent tab 21 is easy to be scalded under the condition that the subsequent battery core main body 22 is charged and discharged, so that potential safety hazards are easily caused. In the two connection modes, the bent tab 21 or the connecting piece 13 occupies the space between the battery post 11 and the battery core main body 22, and the accommodating space of the battery core main body 22 in the battery housing 3 can be reduced under the condition that the specification of the battery housing 3 is unchanged, so that the battery capacity is reduced, and the actual requirement cannot be met.

Therefore, there is a need to invent a battery having a high energy density to solve the above-mentioned problems.

Disclosure of Invention

The utility model aims to provide a battery with higher energy density, so as to realize bending-free lamination and fixation of a tab and a battery post, solve hidden safety hazards hidden by the bent tab and improve the volume energy density of a battery core main body in a battery shell.

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

a battery having a high energy density, comprising:

the battery shell is provided with an accommodating protrusion;

the battery winding core is accommodated in the battery shell and comprises a tab, and the tab extends into the accommodating protrusion; and

the battery cover plate comprises a cover plate main body and a battery pole column, wherein the cover plate main body comprises a horizontal part and a protruding part which are connected, and the protruding part is covered above the accommodating protrusion; the battery pole comprises an external connection part and an internal connection part which are connected, the external connection part is arranged at the outer side of the shell, and the external connection part is used for being connected with external equipment; the inner connecting part is arranged in the shell and extends into the accommodating protrusion in the direction approaching to the protrusion part; the inner connecting part in the accommodating protrusion extends downwards, and the tab in the accommodating protrusion is connected to the side wall of the extending part of the inner connecting part.

Preferably, the battery post further comprises;

one end of each connecting part is connected with the external connecting part, the other end of each connecting part is connected with the internal connecting part, a pole hole corresponding to the connecting part is formed in the horizontal part, and the connecting part is accommodated in the corresponding pole hole. The number of the connecting parts can be selected according to the specific size of the pole, so that the connection between the internal connecting part and the external connecting part of the battery pole is more compact, and the edge tilting and bending of the external connecting part is avoided as much as possible.

Preferably, a sealing element is sandwiched between the side wall of each connecting portion and the hole wall of the corresponding pole hole. The sealing connection of the battery pole and the top cover is realized by the preferred scheme, so that electrolyte is prevented from being reserved from the battery shell through the pole hole when the battery is used.

Preferably, the upper end face of the external connection part is flush with the upper end face of the protruding part. This preferred scheme makes the battery when the equipment module, can improve the inside space utilization of module casing, improves the volume energy density of module.

Preferably, a first insulating plate is sandwiched between the lower end face of the external connection portion and the upper end face of the horizontal portion, and a second insulating plate is sandwiched between the upper end face of the internal connection portion and the lower end face of the cover plate main body. The preferred scheme realizes insulation treatment on the battery pole and the battery cover plate.

Preferably, the second insulating plate below the protrusion is extended downwards to form an extended insulating plate at two sides close to the battery case, the inner connecting part is located at one side of the extended insulating plate far away from the inner side wall of the battery case, and the tab is arranged between the inner connecting part and the extended insulating plate. Because the tab comprises a plurality of tab monomers, after the tab is welded on the side wall of the battery post, the tab monomer on one side of the tab, which is far away from the battery post, is easy to touch the inner wall of the accommodating protrusion (namely the inner side wall of the shell) after being bent, so that the tab is communicated with the inner wall of the shell. Therefore, the extended insulating plate mentioned in the preferred embodiment can insulate the tab from the inner wall of the housing, which helps to avoid this.

Preferably, the battery post is provided with a weight-reducing groove on the bottom wall of the inscription part between the extended insulating plates. This preferred solution helps to reduce the weight of the battery post and thus the overall weight of the battery.

Preferably, the inner wall of the inner joint is provided with a weight-reducing groove, the tab extends into the weight-reducing groove, and the tab is connected to the inner wall of the weight-reducing groove. This preferred scheme has realized the direct welding of utmost point ear and battery post to the risk that no utmost point ear monomer is buckled and is linked together battery case has yet been reached, this preferred scheme's structure is simpler simultaneously.

As a preferable scheme, the upper end and the lower end of the battery winding core are respectively provided with the electrode lugs, the upper end and the lower end of the battery shell are respectively provided with the accommodating protrusions, and each electrode lug is correspondingly arranged with one battery cover plate. The direct welding of the lugs on the two sides of the battery winding core is realized by the preferred scheme.

Preferably, the cover plate main body is provided with a butt joint groove, and the side wall of the battery shell can be inserted into the butt joint groove and fixedly in butt joint with the butt joint groove. When welding apron main part and battery body, no matter be ordinary welding Korean formula penetration welding, the structure that this preferred scheme provided all helps avoiding welding laser to leak into in the casing and cause the influence to the electric core main part in the casing.

The utility model has the beneficial effects that:

according to the battery with higher energy density, the accommodating protrusion is arranged on the battery shell, and the inner connecting part of the battery pole extends into the accommodating protrusion, so that the pole lug on the battery winding core can be welded on the side wall of the battery pole post after extending into the accommodating protrusion, direct welding of the pole lug is realized, and potential safety hazards caused by scalding the battery winding core during charging and discharging due to bending of the pole lug are avoided. The top surface that the holding arch exceeds battery case, utmost point ear and battery post weld the back in the holding arch, place the regional vacation of utmost point ear and battery post welded position originally in the battery case, can provide bigger space for the electric core main part like this to put into the electric core main part of high height, help improving the volume energy density of battery like this. Meanwhile, when the battery module is assembled, after the battery is placed in the battery shell, the structure provided by the scheme can better utilize the space on two sides of the battery pole in the battery shell, so that the space utilization rate of the battery shell is improved, and the volume energy density of the battery core main body in the battery shell is higher.

Drawings

Fig. 1 is a schematic view of a battery structure of a first embodiment provided in the background of the utility model;

fig. 2 is a schematic view of a battery structure according to a second embodiment provided in the background of the utility model;

FIG. 3 is a schematic cross-sectional view of a battery with a higher energy density at a first angle according to an embodiment of the present utility model;

FIG. 4 is a front view of a portion of a higher energy density battery provided in accordance with an embodiment of the present utility model;

FIG. 5 is an enlarged view of a portion of FIG. 3 at A;

FIG. 6 is a schematic cross-sectional view of a battery with higher energy density at a second angle according to an embodiment of the present utility model;

FIG. 7 is a schematic cross-sectional view of a battery with higher energy density at a second angle according to a second embodiment of the present utility model;

FIG. 8 is a schematic cross-sectional view of a battery with higher energy density at a second angle according to a third embodiment of the present utility model;

fig. 9 is a schematic cross-sectional view of a battery cover plate and a portion of a battery housing at a first angle according to a fourth embodiment of the utility model.

In the figure:

1. a battery cover plate; 11. a battery post; 12. a cover plate main body; 13. a connecting sheet;

2. a battery winding core; 21. a tab; 22. a cell body;

3. a battery case;

1000. a battery having a high energy density;

100. a battery cover plate; 110. a battery post; 111. an external connection part; 112. an inner joint part; 1121. a weight-reducing groove; 113. a connection part; 120. a cover plate main body; 121. a horizontal portion; 122. a boss; 123. a butt joint groove; 130. a seal; 140. a first insulating plate; 150. a second insulating plate;

200. a battery winding core; 210. a tab; 220. a cell body;

300. a battery case; 310. the protrusions are accommodated.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The present utility model will be described in further detail with reference to fig. 3 to 9.

Example 1

The embodiment of the utility model provides a battery 1000 with higher energy density. As shown in fig. 3, the battery 1000 having a high energy density includes a battery cover 100, a battery winding core 200, and a battery case 300. The battery case 300 is provided with a receiving protrusion 310, the battery winding core 200 includes a tab 210 and a battery core main body 220 connected to each other, the battery core main body 220 is received in the battery case 300, and the tab 210 extends into the receiving protrusion 310. The battery cover 100 includes a cover body 120 and battery poles 110. The cover main body 120 includes a horizontal portion 121 and a protruding portion 122 connected to each other, and the protruding portion 122 is disposed above the accommodating protrusion 310. The battery post 110 comprises an external connection part 111 and an internal connection part 112 which are connected, wherein the external connection part 111 is arranged at the outer side of the cover plate main body 120, and the external connection part 111 is used for being connected with external equipment; the inner connection part 112 is disposed at the inner side of the cap body 120, the inner connection part 112 extends into the accommodating protrusion 310 in a direction approaching the protrusion 122, the inner connection part 112 in the accommodating protrusion 310 extends downward, and the tab 210 in the accommodating protrusion 310 is connected to a sidewall of a downward extending portion of the inner connection part 112.

This battery 1000 that energy density is higher is through setting up accommodation protrusion 310 on battery housing 300 to extend the inscription portion 112 of battery post 110 to the accommodation protrusion 310 in, can weld on the lateral wall of battery post 110 after making the utmost point ear 210 on the battery core 200 stretch into accommodation protrusion 310, realized utmost point ear 210 and welded directly, and then help avoiding utmost point ear 210 buckling to lead to sending out the potential safety hazard that scalds to electric core main part 220 produced when charging and discharging. The accommodating protrusion 310 is higher than the top surface of the battery case 300, after the tab 210 and the battery post 110 are welded in the accommodating protrusion 310, the area of the battery case 300 where the tab 210 and the battery post 110 are originally placed is free, so that a larger space can be provided for the battery core main body 220 to be placed into the battery core main body 220 with a higher height, and thus the volume energy density of the battery winding core 200 is improved. Meanwhile, when the battery module is assembled, after the battery winding core 200 is placed in the battery shell 300, the structure provided by the scheme can better utilize the space at two sides of the battery pole 110 in the battery shell 300, so that the space utilization rate of the battery shell 300 is improved, and the volume energy density of the battery core main body 220 in the battery shell 300 is higher.

In the present embodiment, the battery winding core 200 includes a tab 210 and a battery core main body 220, and the charge and discharge of the battery core main body 220 are transmitted to the outside through the tab 210 and the battery post 110.

Preferably, the upper and lower ends of the battery winding core 200 are provided with tabs 210, and the upper and lower ends of the battery case 300 are provided with accommodating protrusions 310, and each tab 210 is disposed corresponding to one battery cover plate 100.

In addition, as shown in fig. 4, the upper end surface of the external connection portion 111 is flush with the upper end surface of the protruding portion 122, so that the design is ingenious, the overall height of the battery 1000 with high energy density is not changed, and the overall aesthetic property of the battery 1000 with high energy density is effectively improved. When the whole battery is assembled in a module mode, the utilization rate of the space around the pole of the battery in the module shell is increased. And the volume of the battery cell main body 220 inside the battery winding core 200 is increased, so that the energy density of the battery is increased, and the energy density of the battery module formed by a plurality of batteries is also increased.

Preferably, as shown in fig. 3 and 5, the cap body 120 is provided with a docking slot 123, and the sidewall of the battery case 300 can be inserted into the docking slot 123 to be docked and fixed with the docking slot 123. Through set up docking groove 123 on apron main part 120, can provide the location for the butt joint of apron main part 120 and battery case 300, the staff of being convenient for establishes the apron main part 120 lid in the top of battery case 300 and battery core 200, improves work efficiency.

Further, the cap plate body 120 and the battery case 300 are welded and fixed by butt joints formed by butt joint between the butt joint grooves 123 and the side walls of the battery case 300. When the cover main body 120 and the battery case 300 are welded and fixed, the bottom wall of the butt groove 123 can block laser light at the time of welding so as to avoid the influence of the welding laser light leaking into the battery case 300 to the battery winding core 200 in the battery case 300. It should be noted that, in the present embodiment, the cover main body 120 and the battery case 300 are welded and fixed by common welding or penetration welding, and the common welding and penetration welding are all related art, and are not described herein. In other embodiments, the cover main body 120 and the battery case 300 may be welded and fixed by other welding methods, which is not particularly limited in this embodiment.

Further, as shown in fig. 3, the battery post 110 further includes a connection portion 113, wherein one end of the connection portion 113 is connected to the external connection portion 111, the other end of the connection portion 113 is connected to the internal connection portion 112, a post hole corresponding to the connection portion 113 is formed on the horizontal portion 121, and the connection portion 113 is accommodated in the corresponding post hole. The battery post 110 is provided with the connecting part 113 to fix the external connection part 111 and the internal connection part 112 on the horizontal part 121 together, so that the structure is simple, and the design is ingenious. In order to improve the fixing stability of the battery post 110 and the horizontal portion 121, at least one connecting portion 113 is disposed between the external portion 111 and the internal portion 112. In the present embodiment, only one connecting portion 113 is provided between the external portion 111 and the internal portion 112 in order to save installation space.

Preferably, the sealing member 130 is sandwiched between the side wall of the connecting portion 113 and the hole wall of the corresponding pole hole. By providing the seal 130 between the side wall of the connecting portion 113 and the wall of the corresponding post hole, not only insulation fixation between the connecting portion 113 and the horizontal portion 121 can be achieved, but also the fixation effect of the connecting portion 113 and the horizontal portion 121 can be further ensured and leakage of the electrolyte can be prevented. In this embodiment, the sealing member 130 is a rubber ring, which has high elasticity and good insulation, and is convenient for cutting and forming. In other embodiments, the sealing member 130 may be a ring made of other insulating materials, which is not limited in this embodiment.

Further, as shown in fig. 6, a first insulating plate 140 is sandwiched between the lower end surface of the external connection portion 111 and the upper end surface of the horizontal portion 121, and a second insulating plate 150 is sandwiched between the upper end surface of the internal connection portion 112 and the lower end surface of the cover main body 120, so that the danger caused by direct contact between the external connection portion 111 or the internal connection portion 112 and the cover main body 120 is avoided, and the normal operation of the battery 1000 with higher energy density is ensured. In this embodiment, the first insulating plate 140 and the second insulating plate 150 are made of PPS (Polyphenylene sulfide ), and the PPS material is not only resistant to high temperature and corrosion, but also good in insulating property. In other embodiments, the first insulating plate 140 and the second insulating plate 150 may be made of other insulating materials, which is not limited in this embodiment.

In this embodiment, the two sides of the second insulating plate 150, which are disposed below the protruding portion 122 and are close to the battery case 300, extend downward to form an extended insulating plate, the inner connecting portion 112 is located at one side of the extended insulating plate, which is far away from the inner side wall of the battery case 300, and the tab 210 is disposed between the inner connecting portion 112 and the extended insulating plate, so that the tab 210 and the inner connecting portion 112 are prevented from directly contacting the battery case 300, and normal operation of the battery 1000 with higher energy density is ensured.

Example two

The structure of the battery 1000 with higher energy density disclosed in this embodiment is basically the same as that of the first embodiment, and the structure of the battery 1000 with higher energy density disclosed in this embodiment is different from that of the first embodiment in that: the specific structure of the inner joint part 112 is different.

As shown in fig. 7, in the present embodiment, the inner joint 112 in the accommodating protrusion 310 is provided with a weight-reducing groove 1121, and the side wall of the tab 210 is welded to the outer side wall of the inner joint 112. By providing the weight-reducing groove 1121 in the downward extending inner joint 112, the weight of the inner joint 112 is effectively reduced while the structural strength of the inner joint 112 is maintained, and the overall weight of the battery post 110 and the battery 1000 having a high energy density can be reduced.

Example III

The structure of the battery 1000 with higher energy density disclosed in this embodiment is basically the same as that of the second embodiment, and the structure of the battery 1000 with higher energy density disclosed in this embodiment is different from that of the second embodiment in that: the tab 210 is disposed at different positions.

As shown in fig. 8, in the present embodiment, tab 210 is welded on an inner sidewall of weight-reducing groove 1121, and second insulating plate 150 does not need to extend downward, simplifying the structure of second insulating plate 150, thereby further reducing the overall weight of battery 1000 with higher energy density.

Example IV

The structure of the battery 1000 with higher energy density disclosed in this embodiment is basically the same as that of the first embodiment, and the battery 1000 with higher energy density disclosed in this embodiment is different from that of the first embodiment in that: the specific number of the connection portions 113 between the external connection portion 111 and the internal connection portion 112 is different.

As shown in fig. 9, in the present embodiment, two pole holes are formed on the horizontal portion 121, two connection portions 113 are disposed between the external connection portion 111 and the internal connection portion 112, and each connection portion 113 is disposed corresponding to one pole hole, so that the connection between the battery pole 110 and the horizontal portion 121 is more stable, and edge tilting of the external connection portion 111 is avoided.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. A battery having a high energy density, comprising:

a battery case (300), wherein an accommodating protrusion (310) is provided on the battery case (300);

the battery winding core (200) is accommodated in the battery shell (300), the battery winding core (200) comprises a tab (210) and a battery core main body (220) which are connected, the battery core main body (220) is accommodated in the battery shell (300), and the tab (210) stretches into the accommodating protrusion (310); and

the battery cover plate (100) comprises a cover plate main body (120) and a battery pole (110), wherein the cover plate main body (120) comprises a horizontal part (121) and a protruding part (122) which are connected, and the protruding part (122) is arranged above the accommodating protrusion (310) in a covering manner; the battery pole (110) comprises an external connection part (111) and an internal connection part (112) which are connected, the external connection part (111) is arranged at the outer side of the cover plate main body (120), and the external connection part (111) is used for being connected with external equipment; the inner connecting part (112) is arranged on the inner side of the cover plate main body (120), and the inner connecting part (112) extends into the accommodating protrusion (310) towards the direction approaching the protruding part (122); the inner joint part (112) positioned in the accommodating protrusion (310) extends downwards, and the tab (210) positioned in the accommodating protrusion (310) is connected to the side wall of the extending part of the inner joint part (112).

2. The higher energy density battery of claim 1, wherein the battery post (110) further comprises;

one to a plurality of connecting portion (113), every connecting portion (113) one end all with external portion (111) are connected, every connecting portion (113) the other end all with inscription portion (112) are connected, offer on horizontal part (121) with connecting portion (113) correspond utmost point post hole, connecting portion (113) holding is in corresponding utmost point post hole.

3. The battery of higher energy density according to claim 2, characterized in that a seal (130) is sandwiched between the side wall of each of the connection portions (113) and the wall of the corresponding post hole.

4. The battery of claim 1, wherein an upper end surface of the external connection portion (111) is flush with an upper end surface of the protruding portion (122).

5. The battery with higher energy density according to claim 1, wherein a first insulating plate (140) is sandwiched between the lower end face of the external connection portion (111) and the upper end face of the horizontal portion (121), and a second insulating plate (150) is sandwiched between the upper end face of the internal connection portion (112) and the lower end face of the cover main body (120).

6. The battery of higher energy density according to claim 5, wherein the second insulating plate (150) disposed below the protruding portion (122) extends downward to form an elongated insulating plate near both sides of the battery case (300), the inner connecting portion (112) is located at a side of the elongated insulating plate away from the inner side wall of the battery case (300), and the tab (210) is disposed between the inner connecting portion (112) and the elongated insulating plate.

7. The battery of higher energy density of claim 6 wherein said battery post (110) is formed with a weight-reducing recess (1121) in the bottom wall of said inner joint (112) between said elongated insulating plates.

8. The battery with higher energy density according to claim 5, wherein a weight-reducing groove (1121) is formed on the inner wall of the inner joint (112), the tab (210) extends into the weight-reducing groove (1121), and the tab (210) is connected to the inner wall of the weight-reducing groove (1121).

9. The battery with higher energy density according to claim 1, wherein the tabs (210) are disposed at the upper and lower ends of the battery winding core (200), the accommodating protrusions (310) are disposed at the upper and lower ends of the battery case (300), and each tab (210) is disposed corresponding to one of the battery cover plates (100).

10. The battery with higher energy density according to claim 1, characterized in that a docking slot (123) is provided on the cover main body (120), and the side wall of the battery case (300) can be inserted into the docking slot (123) and is docked and fixed with the docking slot (123).