CN220086307U - High-power large-cell and secondary battery - Google Patents

Abstract

The utility model provides a high-power large-power battery cell, and relates to the technical field of battery structures. The high-power large battery cell comprises a top cover, a plurality of core packages and a plurality of connecting sheets. The top cover is provided with a plurality of polar posts, one part of the polar posts is a positive polar post, and the other part is a negative polar post. The upper end and the utmost point post of connection piece are connected, core package both sides have anodal utmost point ear and negative pole utmost point ear respectively, anodal utmost point ear passes through the core package and is connected with anodal post electricity along the connection piece of one side of width direction, the negative pole utmost point ear passes through the connection piece and the negative pole post electricity of the opposite side of width direction along the core package, consequently, make the welding position of utmost point ear and connection piece change width direction from core package top through setting up to the connection piece, and the connection piece extends along the direction of height, make full use of the space of direction of height makes the welding area of utmost point ear and connection piece increase as far as possible, and then satisfy the demand of high-power charge and discharge of electric core.

Description

High-power large-cell and secondary battery

Technical Field

The utility model relates to the technical field of battery structures, in particular to a high-power large-cell and a secondary battery.

Background

With the increasing popularity of energy storage markets, energy storage cell products are evolving towards large capacities. The use of the high-capacity battery cell can reduce the use amount of PACK end parts and improve the volume energy density; the high-capacity battery cells can realize high capacity by using fewer battery cells, the parallel connection number is reduced, the BMS difficulty is reduced, the integrated assembly process of the energy storage system is simplified by the application of the high-capacity battery cells, and the investment of land capital construction, containers and other costs can be greatly saved, so that the cost is further reduced. The high-power battery cell can further improve the applicable working conditions of the battery cell, and the application of various scenes is met.

The core package (also commonly referred to as a bare cell) is an important component for providing energy in the cell, and the manufacturing mode generally adopts a winding technology, but is limited by the defects of the existing winding technology, when the core package is wider, the alignment degree of positive and negative poles in the cell cannot be ensured, so that a separator cannot insulate the positive and negative poles and the risk of internal short circuit exists, infinite widening of the core package cannot be realized, and the heat dissipation capability of the cell is deteriorated if the thickness is increased. In order to solve the above problems, a large-capacity battery cell having a plurality of core packs has been proposed, and the battery cell capacity is increased by providing a plurality of core packs. However, the inventors found that the connecting sheet in the battery cell is positioned on the upper side of the core pack, and the welding area of the connecting sheet and the tab of the core pack is smaller, so that the charging and discharging power of the core pack is lower.

Disclosure of Invention

The utility model aims to provide a high-power large-power battery cell, which can effectively improve the charge and discharge efficiency of the large-capacity battery cell.

It is also an object of the present utility model to provide a secondary battery that can effectively improve charge and discharge efficiency.

Embodiments of the present utility model may be implemented by:

a high power large cell having a width direction, a thickness direction, and a height direction, the high power large cell comprising:

the top cover is provided with a plurality of polar posts, one part of the polar posts is a positive polar post, and the other part of the polar posts is a negative polar post;

a plurality of core packs arranged on the lower side of the top cover, wherein the plurality of core packs are distributed along the width direction; the core bag is provided with a positive electrode lug and a negative electrode lug which are positioned at two sides in the width direction; and

the connecting pieces extend along the height direction, and the upper ends of the connecting pieces are connected with the pole; the positive electrode tab of the core pack is electrically connected with the positive electrode post through the connecting sheet at one side of the core pack along the width direction, and the negative electrode tab of the core pack is electrically connected with the negative electrode post through the connecting sheet at the other side of the core pack along the width direction.

Optionally, the connecting piece includes a welding part and a reinforcing part connected with each other, the welding part is located at one side of the positive electrode tab or the negative electrode tab along the thickness direction, and is welded and fixed with the positive electrode tab or the negative electrode tab; the reinforcing portion is located at one side of the core pack in the width direction.

Optionally, a plurality of core packages sequentially arranged along the width direction form a core package column, and the connecting pieces comprise end connecting pieces positioned at one side of the core package column along the width direction and middle connecting pieces positioned between two adjacent core packages in the core package column; the cross section of the end connecting piece in the height direction is T-shaped, and the cross section of the middle connecting piece in the height direction is cross-shaped.

Optionally, the plurality of core packages sequentially arranged along the width direction form a core package column, the high-power large battery core comprises a plurality of core package columns, and the plurality of core package columns are sequentially arranged along the thickness direction.

Optionally, the connection piece is located between two adjacent core package rows, and in two adjacent core package rows, along two adjacent core package's of thickness direction anodal utmost point ear with same connection piece welded fastening, along two adjacent core package's of thickness direction negative pole utmost point ear with same connection piece welded fastening.

Optionally, m core packets are included in each core packet column; the top cover is also provided with explosion-proof valves and liquid injection holes, the number of the explosion-proof valves is m-1, and the number of the liquid injection holes is m-1.

Optionally, the connection piece is integrally made with the pole.

Optionally, the connection piece is connected with the pole by welding.

Optionally, the high-power large battery cell further comprises a shell, wherein the shell and the top cover form a containing cavity, and the core package and the connecting sheet are contained in the containing cavity.

A secondary battery comprising at least one high power large cell as described above.

The high-power large-cell and the secondary battery provided by the embodiment of the utility model have the beneficial effects that:

the embodiment of the utility model provides a high-power large battery cell, which comprises a top cover, a plurality of core packages and a plurality of connecting sheets. The top cover is provided with a plurality of polar posts, one part of the polar posts is a positive polar post, and the other part is a negative polar post. The upper end and the utmost point post of connection piece are connected, core package both sides have anodal utmost point ear and negative pole utmost point ear respectively, anodal utmost point ear passes through the core package and is connected with anodal post electricity along the connection piece of one side of width direction, the negative pole utmost point ear passes through the connection piece and the negative pole post electricity of the opposite side of width direction along the core package, consequently, make the welding position of utmost point ear and connection piece change width direction from core package top through setting up to the connection piece, and the connection piece extends along the direction of height, make full use of the space of direction of height makes the welding area of utmost point ear and connection piece increase as far as possible, and then satisfy the demand of high-power charge and discharge of electric core.

The embodiment of the utility model also provides a secondary battery which comprises at least one high-power large battery cell, and therefore has the advantage of high charge and discharge power.

Drawings

The above features and advantages of the present utility model will be better understood after reading the detailed description of embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily to scale and components having similar related features or characteristics may have the same or similar reference numerals.

Fig. 1 is a schematic diagram of the overall structure of a high power large cell provided according to an aspect of the present utility model;

fig. 2 is a schematic diagram illustrating an internal structure of a high power large cell provided according to an aspect of the present utility model;

FIG. 3 is a schematic view of the structure of FIG. 2 from another perspective;

FIG. 4 is a schematic view of the structure of FIG. 2 from a further perspective;

fig. 5 is a schematic diagram showing a connection structure between a top cover and a connection piece in a high-power large-cell according to an aspect of the present utility model;

fig. 6 is a schematic diagram of the structure of fig. 5 from another perspective.

Reference numerals:

100-high power large cell; 110-top cover; 111-pole; 112-positive electrode posts; 113-a negative electrode column; 114-an explosion-proof valve; 115-filling holes; 120-core pack columns; 121-core pack; 122-positive electrode lugs; 123-negative electrode lugs; 130-connecting pieces; 131-a weld; 132-reinforcements; 133-end connection piece; 134-intermediate connecting pieces; 140-a housing.

Detailed Description

The utility model is described in detail below with reference to the drawings and the specific embodiments. It is noted that the aspects described below in connection with the drawings and the specific embodiments are merely exemplary and should not be construed as limiting the scope of the utility model in any way.

In the description of the present utility model, it should be noted that, if the terms "upper," "lower," "inner," "outer," "vertical," and the like indicate an orientation or a positional relationship based on that shown in the drawings or that the inventive product is conventionally put in place when used, it does not indicate or imply that the apparatus or element in question must have a specific orientation or be constructed and operated in a specific orientation, and therefore, the present utility model should not be construed as being limited thereto.

Meanwhile, it should be noted that the terms "first," "second," and the like, if any, are used solely for distinguishing descriptions and not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless explicitly specified or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, integrally connected, or detachably connected; can be mechanically or electrically connected; may be directly connected, or may be indirectly connected through an intermediate medium, or may be communicated with the inside of two elements. The specific meaning of the above terms in the present utility model can be understood as appropriate by those of ordinary skill in the art.

Fig. 1 is a schematic diagram of the overall structure of a high-power and high-power battery cell 100 according to the present embodiment, fig. 2 is a schematic diagram of the internal structure of the high-power and high-power battery cell 100 according to the present embodiment, fig. 3 is a schematic diagram of the structure of fig. 2 under another view, and in fig. 2 and 3, in order to show the internal structure of the high-power and high-power battery cell 100, the components such as the case 140 are removed. Referring to fig. 1-3, the present embodiment provides a high-power and large-power battery cell 100, and correspondingly, a secondary battery (not shown). The secondary battery includes at least one high-power large cell 100.

The high power large cell 100 has a width direction (X direction as shown in fig. 1 and 3), a thickness direction (Y direction as shown in fig. 1 and 3), and a height direction (Z direction as shown in fig. 1 and 3). The high power large cell 100 includes a top cover 110, a plurality of core packages 121, and a plurality of tabs 130. The top cover 110 is provided with a plurality of polar posts 111, wherein part of the polar posts 111 is a positive polar post 112, and the other part is a negative polar post 113. The upper end and the utmost point post 111 of connection piece 130 are connected, core package 121 has anodal utmost point ear 122 and negative pole utmost point ear 123 respectively along the both sides of width direction, anodal utmost point ear 122 is connected with anodal post 112 electricity through the connection piece 130 of core package 121 along one side of width direction, negative pole utmost point ear 123 is connected with negative pole post 113 electricity through the connection piece 130 of core package 121 along the opposite side of width direction, consequently, make the welding position of utmost point ear and connection piece 130 change into width direction from core package 121 top through the setting to connection piece 130, and connection piece 130 extends along the direction of height, make full use of the space of direction of height makes the welding area of utmost point ear and connection piece 130 increase as far as possible, and then satisfy the demand of high-power charge and discharge of electric core.

Fig. 4 shows a schematic diagram of the structure of fig. 2 from a further view. Referring to fig. 1 to 4 in combination, a plurality of core packages 121 sequentially arranged along the width direction form a core package row 120, in this embodiment, the high-power and large-sized battery cell 100 includes a plurality of core package rows 120, and the plurality of core package rows 120 are sequentially arranged along the thickness direction, i.e., in the high-power and large-sized battery cell 100 provided in this embodiment, the plurality of core packages 121 are distributed in a matrix along the width direction and the thickness direction. In the description of the present embodiment, the "plurality" index number is equal to or greater than two. It will be appreciated that in other embodiments, only one core pack row 120 may be provided, and each core pack row 120 includes two or more core packs 121, where the core packs 121 of the high-power large battery cell 100 are expanded only in the width direction.

As shown in fig. 2 to 4, in the present embodiment, the number of the core packages 121 in the high-power large battery cell 100 is four, and the four core packages 121 form two core package rows 120, and each core package row 120 has two core packages 121 therein. In other embodiments, the number of core packages 121, and the number in each core package column 120,

fig. 5 shows a schematic diagram of a connection structure between the top cover 110 and the connection piece 130 in the high-power large-power battery cell 100, fig. 6 shows a schematic diagram of the structure in fig. 5 at another view angle, specifically, fig. 5 is a front view structure, and fig. 6 is a bottom view structure. Referring to fig. 1-6 in combination, in the present embodiment, the connection piece 130 is located between two adjacent core package rows 120, and in the two adjacent core package rows 120, the positive electrode tabs 122 of two adjacent core packages 121 along the thickness direction are welded and fixed with the same connection piece 130, and the negative electrode tabs 123 of two adjacent core packages 121 along the thickness direction are welded and fixed with the same connection piece 130.

Specifically, the plurality of connection pieces 130 are distributed along the width direction to form one connection piece 130 row, and two adjacent core package rows 120 are electrically connected with the pole 111 through the same connection piece 130 row. Since the number of the core package rows 120 in the high-power and large-power battery cell 100 provided in the present embodiment is two, accordingly, the number of the connecting pieces 130 in the present embodiment is one, more specifically, in the present embodiment, the number of the connecting pieces 130 is three, and the three connecting pieces 130 are distributed along the width direction.

The number of the connection pieces 130 is consistent with that of the poles 111, and the connection pieces 130 are arranged in a one-to-one correspondence with the poles 111, so in this embodiment, the number of the poles 111 is also three, the number of the positive poles 112 and the negative poles 113 in the three poles 111 is not strictly limited, and in the direction from left to right in fig. 4, the poles 111 may start from the positive poles 111 or from the negative poles 111, which depends on the arrangement of the lugs on the core pack 121.

As shown in fig. 4, in the present embodiment, the positive electrode posts 111 are provided in the left-to-right direction, so in the present embodiment, the number of positive electrode posts 111 is two, the number of negative electrode posts 111 is one, and in other embodiments, the negative electrode posts 111 are provided in the left-to-right direction, and at this time, the number of negative electrode posts 111 is two, and the number of positive electrode posts 111 is one.

Alternatively, the connection piece 130 and the pole 111 may be provided as an integrally formed structure, i.e., machined from an integral material, or integrally cast, integrally stamped, etc. Alternatively, the connection piece 130 and the pole 111 may be formed as separate structures, and then fixedly connected together by welding.

Further, the connection pieces 130 include end connection pieces 133 located at one side of the core pack row 120 in the width direction, and intermediate connection pieces 134 located between two adjacent core packs 121 in the core pack row 120, specifically, since the number of connection pieces 130 is three in the present embodiment, two of the three connection pieces 130 are end connection pieces 133 and the remaining one is the intermediate connection piece 134, as shown in fig. 6. The positive electrode tabs 122 of the two core packs 121 adjacent to the end connecting pieces 133 are welded and fixed to the same end connecting piece 133, so as to be electrically connected with the positive electrode post 111 through the end connecting pieces 133. At the same time, the negative tabs 123 of the four core packets 121 are welded to the intermediate connecting piece 134.

Alternatively, the connection piece 130 includes a reinforcing portion 132 and a welding portion 131 connected to each other, the welding portion 131 is located at one side of the positive electrode tab 122 or the negative electrode tab 123 in the thickness direction, and the welding portion 131 is welded and fixed with the positive electrode tab 122 or the negative electrode tab 123; the reinforcing portion 132 is located on one side of the core pack 121 in the width direction.

Specifically, as shown in fig. 5 and 6, the reinforcing portion 132 and the welding portion 131 in the end connecting piece 133 each have a rectangular sheet shape, and in the end connecting piece 133, the long side of the reinforcing portion 132 extends in the height direction, and the wide side of the reinforcing portion 132 extends in the thickness direction; the long side of the welded portion 131 extends in the height direction, and the wide side of the welded portion 131 extends in the width direction. Alternatively, one end of the welded portion 131 in the width direction is fixed to the middle of the reinforcing portion 132, and the end connecting piece 133 thus formed has a T-shaped cross section in the height direction.

In the description of the present embodiment, a "cross section in the height direction" of a certain member is a plane in which the member is sectioned by a plane perpendicular to the height direction (i.e., a plane formed by the width direction and the thickness direction).

The positive electrode lugs 122 of two core bags 121 adjacent to the end connecting piece 133 are welded and fixed on two sides of the welding part 131 respectively, the positive electrode lugs 122 are in the shape of long edges extending in the height direction, the positive electrode lugs 122 can be welded and fixed with the welding part 131 of the end connecting piece 133 everywhere along the height direction, and the welding area of the positive electrode lugs 122 and the end connecting piece 133 is increased compared with the mode that the traditional connecting piece 130 is arranged at the top of the core bag 121, so that the charging and discharging power can be improved.

The reinforcing portion 132 and the welding portion 131 in the intermediate connecting piece 134 are each rectangular sheet-like, and in the end connecting piece 133, the long side of the reinforcing portion 132 extends in the height direction, and the wide side of the reinforcing portion 132 extends in the thickness direction; the long side of the welded portion 131 extends in the height direction, and the wide side of the welded portion 131 extends in the width direction. Alternatively, the middle part of the wide side of the welding part 131 is fixedly connected with the middle part of the wide side of the reinforcing part 132, and the middle connecting piece 134 thus formed has a cross-shaped cross section in the height direction.

The middle connecting piece 134 is disposed between two adjacent core package columns 120 and is located between two adjacent core packages 121 in the same core package column 120, so that four core packages 121 are surrounded by the middle connecting piece 134, and the cathode tabs 123 of the four core packages 121 are welded and fixed with the middle connecting piece 134. The negative electrode tab 123 is the slice that extends along the direction of height, and the negative electrode tab 123 all the place along the direction of height can with the welded part 131 welded fastening of middle connection piece 134, and the welding area of negative electrode tab 123 and middle connection piece 134 is bigger than traditional connection piece 130 and sets up the mode at core package 121 top to can promote charge-discharge power.

Referring to fig. 1-6, the top cover 110 is provided with an explosion-proof valve 114 and a liquid injection hole 115, each core pack row 120 includes m core packs 121, the number of the explosion-proof valves 114 is set to be m-1, and the number of the liquid injection holes 115 is set to be m-1. In this embodiment, the number of core packs 121 in each core pack row 120 is two, so the number of explosion-proof valves 114 in the high-power and large-power battery cell 100 provided in this embodiment is one, and the number of injection holes 115 is one.

In this embodiment, the high-power large cell 100 further includes a housing 140, where the housing 140 is connected with the top cover 110 to form a receiving cavity, and the core pack 121 and the connection piece 130 are both received in the receiving cavity. It will be appreciated that the high power cell 100 further includes components required for conventional cells, for example, the high power cell 100 further includes an insulating layer (not shown) disposed between the case 140 and the core pack 121, and in particular, the core pack 121 and the connection tab 130 may be previously wrapped with the insulating layer before the case 140 is mounted.

The high-power large battery cell 100 provided by the embodiment of the utility model contains the core package 121 distributed along the width direction and the thickness direction, so that the expansion in the width direction and the thickness direction is realized, the battery cell capacity is greatly improved, meanwhile, the connecting sheets 130 extend along the height direction and are positioned at the two sides of the core package 121 in the width direction, and the welding area of the positive electrode tab 122 and the negative electrode tab 123 of the core package 121 and the connecting sheets 130 is increased by utilizing the space of the high-power large battery cell 100 in the width direction, so that the charge and discharge power is improved.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present utility model should be included in the scope of the present utility model.

Claims (10)

1. A high power large cell having a width direction, a thickness direction, and a height direction, the high power large cell comprising:

the top cover is provided with a plurality of polar posts, one part of the polar posts is a positive polar post, and the other part of the polar posts is a negative polar post;

a plurality of core packs arranged on the lower side of the top cover, wherein the plurality of core packs are distributed along the width direction; the core bag is provided with a positive electrode lug and a negative electrode lug which are positioned at two sides in the width direction; and

the connecting pieces extend along the height direction, and the upper ends of the connecting pieces are connected with the pole; the positive electrode tab of the core pack is electrically connected with the positive electrode post through the connecting sheet at one side of the core pack along the width direction, and the negative electrode tab of the core pack is electrically connected with the negative electrode post through the connecting sheet at the other side of the core pack along the width direction.

2. The high-power large cell according to claim 1, wherein the connecting piece includes a welded portion and a reinforcing portion that are connected to each other, the welded portion being located on one side of the positive electrode tab or the negative electrode tab in the thickness direction and being welded and fixed with the positive electrode tab or the negative electrode tab; the reinforcing portion is located at one side of the core pack in the width direction.

3. The high-power large cell according to claim 2, wherein a plurality of core packs arranged in order in the width direction constitute a core pack row, the connecting pieces including an end connecting piece located at one side of the core pack row in the width direction and an intermediate connecting piece located between two adjacent ones of the core packs in the core pack row; the cross section of the end connecting piece in the height direction is T-shaped, and the cross section of the middle connecting piece in the height direction is cross-shaped.

4. The high-power large cell according to claim 1, wherein a plurality of core packages sequentially arranged in the width direction constitute a core package row, the high-power large cell includes a plurality of core package rows, and a plurality of the core package rows are sequentially arranged in the thickness direction.

5. The high-power large cell according to claim 4, wherein the connecting piece is located between two adjacent core pack rows, and in two adjacent core pack rows, positive electrode tabs of two adjacent core packs in the thickness direction are welded and fixed with the same connecting piece, and negative electrode tabs of two adjacent core packs in the thickness direction are welded and fixed with the same connecting piece.

6. The high power large cell of claim 4, wherein each of said rows of core packets comprises m core packets; the top cover is also provided with explosion-proof valves and liquid injection holes, the number of the explosion-proof valves is m-1, and the number of the liquid injection holes is m-1.

7. The high power large cell of claim 1, wherein the connecting tab is integrally formed with the post.

8. The high power large cell of claim 1, wherein the connecting tab is connected to the post by welding.

9. The high power large cell of claim 1, further comprising a housing, the housing and the top cap forming a receiving cavity, the core pack and the tab each being received in the receiving cavity.

10. A secondary battery comprising at least one high power large cell according to any one of claims 1 to 9.