CN210040381U

CN210040381U - Battery monomer, battery pack and battery pack

Info

Publication number: CN210040381U
Application number: CN201921276466.9U
Authority: CN
Inventors: 钟宽; 李雪云; 汪高峰; 吴西燚; 魏文飞; 曾梦丝
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-08-06
Filing date: 2019-08-06
Publication date: 2020-02-07
Anticipated expiration: 2029-08-06

Abstract

The application provides a battery monomer and group battery and battery pack. The battery monomer comprises a battery body and a positive electrode lug and a negative electrode lug which are respectively connected with the battery body. The positive tab is connected at the first end of the battery body, the positive tab protrudes out of the first side face of the battery body from the first end of the battery body, the negative tab is connected at the second end of the battery body, the negative tab protrudes out of the second side face of the battery body from the second end of the battery body, and the second side face is opposite to the first side face. Use the technical scheme of the utility model, set up anodal ear and negative pole ear respectively at the first end and the second end of battery body to anodal ear and negative pole ear are from battery body's first side and second side protrusion respectively. Therefore, the structure enables the positive electrode lug and the negative electrode lug to be wider, reduces the internal resistance of the single battery, enables the battery pack to meet the requirement of high-rate discharge, and can avoid the conditions of short circuit and the like easily caused in the assembly process.

Description

Battery monomer, battery pack and battery pack

Technical Field

The utility model relates to a battery technology field particularly, relates to a battery monomer and group battery and battery pack.

Background

Lithium ion batteries have been widely used in the fields of 3C digital products, energy storage batteries, electric vehicles, and the like. Because most of the lithium ion power batteries have lower voltage and smaller capacity at present and cannot meet the power requirement of the whole vehicle, a plurality of single battery cores need to be connected in series and in parallel to form a battery module capable of meeting the power requirement of the whole vehicle.

The lithium ion battery can be divided into an aluminum-shell battery, a steel-shell battery and a soft-package aluminum-plastic film battery according to the external package. At present, most of battery cells used by a battery module consisting of flexible package battery cells are provided with double tabs at one end, so that the battery module is favorable for packaging, assembling and mounting.

However, since the double tabs only extend from one end of the battery cell, a large battery cell tab cannot be manufactured, which results in narrow battery cell tabs, large internal resistance, short circuit easily caused in the assembly process, and the like.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a battery monomer and group battery and battery pack to solve among the prior art the narrower group battery internal resistance big technical problem that causes of electric core utmost point ear that laminate polymer battery exists.

The embodiment of the application provides a battery monomer, including battery body and the positive ear and the negative pole ear of being connected with battery body respectively, positive ear connects the first end at battery body, and positive ear protrudes in battery body's first side from battery body's first end, negative pole ear connects the second end at battery body, and negative pole ear protrudes in battery body's second side from battery body's second end, the second side is relative with first side, when two battery monomers establish ties, two battery monomer superposes, the positive ear of a battery monomer links to each other with another battery monomer's negative pole ear.

The application also provides a battery pack, which comprises a plurality of battery monomers, wherein the battery monomers are the battery monomers, the battery monomers are overlapped, and the positive lug of one battery monomer is connected with the negative lug of the other battery monomer in sequence.

The application also provides a battery pack, which comprises a shell and a battery pack arranged in the shell, wherein the battery pack is the battery pack.

In one embodiment, the battery assembly further comprises a heat dissipation spacer disposed between two adjacent battery cells.

In one embodiment, the heat dissipation spacer is provided with heat dissipation holes.

In one embodiment, the housing comprises:

the bottom of the bottom shell is provided with a plurality of limiting convex ribs which are arranged at intervals, and two adjacent limiting convex ribs limit one single battery;

the cover body covers the bottom shell, and is provided with a power connection hole;

the battery pack further includes:

and the electric connecting post penetrates through the electric connecting hole to be electrically connected with the positive electrode lug and the negative electrode lug on the two sides of the battery pack respectively.

In one embodiment, the cover includes:

the top cover is covered on the top of the bottom shell;

a side cover covering the side of the bottom case;

the electric connection hole is arranged on the top cover or the side cover.

In one embodiment, the bottom shell is connected to the top cover and/or the side cover by a snap-fit structure.

In one embodiment, the inner wall of the side cover is provided with a first clamping groove corresponding to the position of the limiting convex rib, and the first clamping groove is used for inserting the heat dissipation spacing piece.

In one embodiment, a second clamping groove corresponding to the position of the limiting convex rib is formed in the side wall, opposite to the side cover, of the bottom shell, and the second clamping groove is also used for inserting the heat dissipation spacing piece.

In the above-described embodiment, the positive electrode tab and the negative electrode tab are provided at the first end and the second end of the battery body, respectively, and the positive electrode tab and the negative electrode tab protrude from the first side surface and the second side surface of the battery body, respectively. Therefore, the structure enables the positive electrode lug and the negative electrode lug to be wider, reduces the internal resistance of the single battery, enables the battery pack to meet the requirement of high-rate discharge, and can avoid the conditions of short circuit and the like easily caused in the assembly process.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

fig. 1 is a schematic perspective view of an embodiment of a battery cell according to the present invention;

fig. 2 is a schematic perspective view of an embodiment of a battery pack according to the present invention;

fig. 3 is a schematic perspective view of an embodiment of a battery assembly according to the present invention;

FIG. 4 is an exploded schematic view of the battery assembly of FIG. 3;

FIG. 5 is a schematic structural view of a bottom case of the battery assembly of FIG. 4;

fig. 6 is a schematic structural view of a side cover of the battery pack of fig. 4;

fig. 7 is a schematic view of the structure of a heat sink spacer of the battery assembly of fig. 4.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

Fig. 1 shows an embodiment of the battery cell of the present invention, which includes a battery body 10 and a positive electrode tab 11 and a negative electrode tab 12 connected to the battery body 10 respectively. The positive tab 11 is connected to a first end of the battery body 10, the positive tab 11 protrudes from the first end of the battery body 10 to a first side a of the battery body 10, the negative tab 12 is connected to a second end of the battery body 10, and the negative tab 12 protrudes from the second end of the battery body 10 to a second side b of the battery body 10, the second side b being opposite to the first side a.

Use the technical scheme of the utility model, set up anodal ear 11 and negative pole ear 12 respectively at the first end and the second end of battery body 10 to anodal ear 11 and negative pole ear 12 are respectively from battery body 10's first side a and second side b protrusion. Thus, the structure enables the positive tab 11 and the negative tab 12 to be wider, the internal resistance of the single battery is reduced, the battery pack can meet the requirement of high-rate discharge, and the situations of short circuit and the like easily caused in the assembly process can be avoided.

When two cells are connected in series, as shown in fig. 2, the two cells are stacked, and the positive tab 11 of one cell is connected to the negative tab 12 of the other cell. Therefore, the battery monomer can be connected in a series connection mode of a conventional soft package battery pack, the positive electrode tab 11 and the negative electrode tab 12 are wide, point connection is convenient to carry out, and the internal resistance of the battery monomer is small.

Fig. 2 shows an embodiment of the battery pack of the present invention, which includes a plurality of the above-mentioned battery cells, and a plurality of the battery cells are stacked, and in turn, the positive tab 11 of one battery cell is connected to the negative tab 12 of another battery cell to form a battery pack with a higher capacity. The specific number of the battery monomers can be correspondingly adjusted according to the requirement of electric quantity. Optionally, the battery pack can be directly installed in the shell after being formed into a module by a laser welder, and the operation is convenient and easy to implement.

Fig. 3 shows an embodiment of the battery assembly of the present invention, which includes a housing and a battery pack disposed in the housing, the battery pack being the above-mentioned battery pack. The battery pack has lower internal resistance and more convenient battery cell connection technology.

Optionally, as shown in fig. 4, the battery assembly further includes a heat dissipation spacer 30, and the heat dissipation spacer 30 is disposed between two adjacent battery cells. Two adjacent battery cells can be effectively spaced apart by the heat dissipation spacer 30, thereby facilitating heat dissipation of the battery cells. More preferably, the heat dissipation spacer 30 is made of a deformable material, so that the heat dissipation spacer 30 has certain buffering capacity, and when the battery monomer expands, the local expansion pressure of the battery monomer can be buffered through the heat dissipation spacer 30, so that the battery performance of the battery monomer cannot be influenced by extruding the adjacent battery monomer. As shown in fig. 7, as a more preferred embodiment, the heat dissipation spacer 30 is provided with heat dissipation holes 31 to further improve the heat dissipation effect of the battery cells. Optionally, when the heat dissipation spacer 30 is inserted between two adjacent battery cells, the heat dissipation spacer 30 needs to avoid a connection between the positive electrode tab 11 and the negative electrode tab 12 of the two battery cells, and therefore an avoiding groove 32 is further formed in the heat dissipation spacer 30. More preferably, the avoiding groove 32 may be in interference fit with the positive tab 11 and the negative tab 12 to realize the snap-fit fixation of the positive tab 11 and the negative tab 12, so as to improve the connection strength of the positive tab 11 and the negative tab 12.

Optionally, as shown in fig. 4 and 5, the casing includes a bottom casing 21 and a cover, a plurality of limiting convex ribs 211 are disposed at intervals at the bottom of the bottom casing 21, and two adjacent limiting convex ribs 211 limit and fix a single battery, so that the single battery can be fixed and limited. The cover body is covered on the bottom shell 21, and the cover body is provided with a power connection hole. When the battery pack is used, the electric connecting columns 40 penetrate through the electric connecting holes to be respectively and electrically connected with the positive electrode lugs 11 and the negative electrode lugs 12 on the two sides of the battery pack, and then the electric connecting columns 40 can be used for connecting electricity to use the whole battery pack.

Specifically, in the technical solution of this embodiment, as shown in fig. 4 and 6, the cover body includes a top cover 22 and a side cover 23, the top cover 22 is disposed on the top of the bottom case 21, and the side cover 23 is disposed on the side of the bottom case 21. As another alternative embodiment, the top cover 22 may be provided with an electrical connection hole. More preferably, a rib is further formed on the outer wall of the bottom case 21 and/or the top cover 22 and/or the side cover 23 to improve the overall strength of the case.

As shown in fig. 5, in the solution of the present embodiment, it is more preferable that the bottom case 21 and the side cover 23 are connected by a snap structure 24 to facilitate the installation of the side cover 23. As shown in fig. 4, the top cover 22 is connected to the bottom cover 21 by screws. As another alternative, the bottom case 21 and the top cover 22 may also be connected by the snap structure 24.

As a preferred embodiment, as shown in fig. 5, a first locking groove 231 corresponding to the position of the limiting rib 211 is opened on the inner wall of the side cover 23, and the first locking groove 231 is used for inserting the heat dissipation spacer 30. Thus, the first engaging groove 231 can fix the heat dissipating spacer 30, and the effect of limiting and fixing the battery cells can be enhanced. More preferably, as shown in fig. 6, a second locking groove 212 corresponding to the position of the limiting rib 211 is formed on a side wall of the bottom case 21 opposite to the side cover 23, and the second locking groove 212 is also used for inserting the heat dissipation spacer 30, so as to further enhance the limiting and fixing effect on the battery cells.

It should be noted that the technical scheme of the utility model, be particularly useful for soft packet of battery group. By adopting the technical scheme, the mechanical strength of the soft-package battery pack shell is improved, and the impact force of foreign objects is resisted; the problem of expansion and extrusion among the single batteries can be effectively solved, and the heat dissipation spacing pieces are adopted, so that heat dissipation among the batteries is facilitated, and the problem of reduction of the service life of the batteries due to local overheating is prevented; in addition, the module structural design is easy to assemble and disassemble, and the structure is simple and easy to implement.

Specifically, as shown in fig. 4, in the implementation, positive tab 11 and negative tab 12 of 6 cells are welded and connected in series by a laser welder to form a battery pack. The positive tab 11 and the negative tab 12 of the two single batteries at the two most two sides of the battery pack are respectively used as the positive electrode and the negative electrode of the battery pack, so that the positive tab 11 and the negative tab 12 are preferably provided with small holes, and the positive tab 11 and the negative tab 12 are riveted with the electric connecting post 40 through screws. The grouped battery pack is connected with the side cover 23 through screws, and the electric connecting posts 40 are externally connected as positive and negative electrode posts. Then, the side cover 23 and the battery pack are pushed into the bottom case 21 from the opening of the bottom case 21 along the limiting ribs 211, and then the battery pack is fixed by using the heat conductive adhesive material, so that the battery pack can be well positioned. Finally, insert heat dissipation spacer 30 in proper order between two adjacent battery monomer, let dodge groove 32 and aim at the junction of positive pole ear 11 and negative pole ear 12, play further fixed action, buckled bottom shell 21 through the screw with top cap 22 at last to whole battery pack seals.

The utility model provides a battery pack has not only reduced the internal resistance of the flexible package electricity core of equidimension, has increased battery pack's security moreover, makes a whole set of battery pack safer, and the performance is more superior, and it is more convenient to make the installation.

The above is only the preferred embodiment of the present invention, and is not limited and fixed in any form. Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. Therefore, all the contents that do not depart from the technical solution of the present invention are based on the present invention, and any simple modification, accumulation, equivalent change and modification made by the technical substance to the above embodiments should all fall within the protection scope of the technical solution of the present invention.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention for those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery monomer comprises a battery body (10), and a positive tab (11) and a negative tab (12) which are respectively connected with the battery body (10), characterized in that the positive lug (11) is connected with the first end of the battery body (10), and the positive tab (11) protrudes from a first end of the battery body (10) to a first side surface (a) of the battery body (10), the negative electrode tab (12) is connected to the second end of the battery body (10), and the negative electrode tab (12) protrudes from a second end of the battery body (10) to a second side surface (b) of the battery body (10), the second side surface (b) being opposite to the first side surface (a), when the two battery cells are connected in series, the two battery cells are superposed, and the positive electrode tab (11) of one battery cell is connected with the negative electrode tab (12) of the other battery cell.

2. A battery pack comprising a plurality of battery cells, wherein said battery cells are the battery cells of claim 1, wherein a plurality of said battery cells are stacked, and wherein said positive tab (11) of one of said battery cells is connected to said negative tab (12) of another of said battery cells in sequence.

3. A battery assembly comprising a housing and a battery pack disposed within the housing, wherein the battery pack is the battery pack of claim 2.

4. The battery pack according to claim 3, further comprising a heat dissipation spacer (30), wherein the heat dissipation spacer (30) is disposed between two adjacent battery cells.

5. The battery pack according to claim 4, wherein the heat dissipation spacer (30) is provided with a heat dissipation hole (31).

6. The battery assembly of claim 4, wherein the housing comprises:

the battery pack comprises a bottom shell (21), wherein a plurality of limiting convex ribs (211) are arranged at intervals at the bottom of the bottom shell (21), and two adjacent limiting convex ribs (211) limit one battery unit;

the cover body is covered on the bottom shell (21), and a power connection hole is formed in the cover body;

the battery assembly further includes:

and the electric connecting post (40) penetrates through the electric connecting hole to be electrically connected with the positive electrode lug (11) and the negative electrode lug (12) on two sides of the battery pack respectively.

7. The battery assembly of claim 6, wherein the cover comprises:

the top cover (22) is arranged on the top of the bottom shell (21) in a covering mode;

a side cover (23) provided to cover a side portion of the bottom case (21);

the power connection hole is formed in the top cover (22) or the side cover (23).

8. The battery assembly according to claim 7, characterized in that the bottom shell (21) is connected with the top cover (22) and/or the side covers (23) by means of snap-on structures (24).

9. The battery pack according to claim 7, wherein the inner wall of the side cover (23) is provided with a first locking groove (231) corresponding to the position of the limiting convex rib (211), and the first locking groove (231) is used for inserting the heat dissipation spacer (30).

10. The battery pack according to claim 7, wherein a second locking groove (212) corresponding to the position of the limiting rib (211) is formed in a side wall of the bottom case (21) opposite to the side cover (23), and the second locking groove (212) is also used for inserting the heat dissipation spacer (30).