CN213752913U - Lithium ion battery pack - Google Patents

Abstract

The utility model discloses a lithium ion battery pack, which comprises a top end insulation protection plate, a BMS protection plate, a plurality of battery cells, a positive electrode confluence aluminum plate and a negative electrode confluence aluminum plate, go up insulation protection board, the upper bracket, lower insulation protection board, the lower carriage, a plurality of electric cores set up side by side and are located between upper bracket and the lower carriage, the upper bracket is equipped with the positive recess that converges aluminum plate of installation, it is located the upper bracket surface to go up insulation protection board, the lower carriage is equipped with the negative pole recess that converges aluminum plate, lower insulation protection board is located the lower carriage surface, the BMS protection board is located the top of a plurality of electric cores, top insulation protection board is located the surface of BMS protection board, the positive pole of each electric core adopts the aluminium silk to weld the positive pole to converge aluminum plate and connect through the positive pole aluminum plate electricity that converges jointly, the negative pole of each electric core adopts the aluminium silk to weld the negative pole to converge aluminum plate and connect through the negative pole aluminum plate electricity that converges jointly. The lithium ion battery pack has the advantages of high structural strength, high stability and good safety.

Description

Lithium ion battery pack

Technical Field

The utility model relates to a lithium ion technology product field, more specifically relate to a lithium ion battery group.

Background

In recent years, with the rapid development of electric tools, electric toys, model airplanes and electric vehicles, the traditional power energy sources such as lead-acid batteries, nickel-cadmium batteries and nickel-hydrogen batteries cannot meet the requirements of the devices on power due to the problems of heavy weight and environmental pollution.

The lithium ion battery is a green recyclable energy widely popularized at present, and for the application of the electric tools, the electric toys, the model airplanes and the electric vehicles, the devices have the working requirement of instantly or continuously adopting large current, some of the devices even require 30C and 35C to discharge, and with the development of science and technology, the devices can also require higher discharge multiplying power in the future, and the electric quantity requirement is that the current single lithium ion single battery is difficult to adapt to the requirement.

The high-rate lithium ion battery pack formed by connecting a plurality of single batteries in series or in parallel has the characteristics of high working voltage, light weight, small volume, no memory effect, small self-discharge, long cycle life and the like, and is gradually replacing the traditional power energy sources such as lead-acid batteries, nickel-cadmium batteries, nickel-hydrogen batteries and the like.

The lithium ion battery pack can be formed by connecting single batteries in parallel, when the lithium ion battery pack is connected, the positive electrode tabs of the single batteries are sequentially connected in a pairwise welding manner, and the negative electrode tabs are sequentially connected in a pairwise welding manner, so that the single batteries are connected together in a parallel electric connection manner, and high current output is realized. At present, the small-power lithium ion battery packs of cylindrical cells such as 18650 cells and 21700 cells are all made of directly-arranged symmetrical universal nickel-plated steel strips with the thickness of 0.15mm-0.2mm during structural design, and the universal nickel strips are easy to rust, high in internal resistance and high in heat generation, influence on the cell consistency of the lithium ion battery packs and have safety problems.

Therefore, it is necessary to develop a lithium ion battery pack to solve the above-mentioned drawbacks.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a lithium ion battery group that structural strength is high, stability is strong, the security is good.

In order to achieve the above purpose, the utility model discloses a lithium ion battery pack, which comprises a top end insulation protection plate, a BMS protection plate, a plurality of electric cores, a positive electrode confluence aluminum plate, a negative electrode confluence aluminum plate, an upper insulation protection plate, an upper bracket, a lower insulation protection plate and a lower bracket, wherein the electric cores are arranged in parallel and are positioned between the upper bracket and the lower bracket, the upper bracket is provided with a groove for installing the positive electrode confluence aluminum plate, the upper insulation protection plate is positioned on the outer surface of the upper bracket, the lower bracket is provided with a groove for installing the negative electrode confluence aluminum plate, the lower insulation protection plate is positioned on the outer surface of the lower bracket, the BMS protection plate is positioned at the top parts of the electric cores, the top end insulation protection plate is positioned on the outer surface of the BMS protection plate, the positive electrodes of the electric cores are welded to the positive electrode confluence aluminum plate by adopting aluminum wires and are electrically connected through the positive electrode confluence aluminum plate, and the negative electrodes of the battery cores are welded to the negative electrode confluence aluminum plate together by adopting aluminum wires and are electrically connected through the negative electrode confluence aluminum plate.

Preferably, a first bonding layer is arranged between the upper support and the anode bus aluminum plate, and a first bonding layer is arranged between the lower support and the cathode bus aluminum plate.

Preferably, the upper support and the lower support are matched to form an area for positioning the plurality of battery cells.

Preferably, the upper support and the lower support are respectively provided with a plurality of through holes corresponding to the anode and the cathode of the battery cell.

Preferably, a fence structure for positioning the plurality of battery cells is arranged between the upper support and the lower support.

Preferably, second bonding layers are arranged between the battery cell and the upper support and between the battery cell and the lower support.

Preferably, the lithium ion battery pack further includes a fastener, by which the BMS protection plate is fixed to the upper and lower brackets.

Drawings

Fig. 1 is a schematic diagram of the lithium ion battery pack of the present invention.

Fig. 2 is a partially exploded view of the lithium ion battery pack shown in fig. 1.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is an exploded view of the lithium ion battery pack shown in fig. 1.

Fig. 5 is a schematic structural view of the lower bracket of fig. 4.

Fig. 6 is a schematic structural view of the upper bracket in fig. 4.

Description of the symbols:

lithium ion battery group 100, top insulation protection board 10, BMS protection board 11, electric core 12, anodal aluminum plate 13 that converges, upper insulation protection board 15, upper bracket 16, lower insulation protection board 17, lower carriage 18, rail structure 19, fastener 20, through hole 21, lower constant head tank 22, aluminium silk 23.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-6, a lithium ion battery pack 100 of the present invention includes a top insulating protection plate 10, a BMS protection plate 11, a plurality of battery cells 12, a positive bus aluminum plate 13, a negative bus aluminum plate (not shown), an upper insulating protection plate 15, an upper bracket 16, a lower insulating protection plate 17, and a lower bracket 18, wherein the plurality of battery cells 12 are disposed side by side and located between the upper bracket 16 and the lower bracket 18, the upper bracket 16 is provided with a groove for mounting the positive bus aluminum plate 13, the upper insulating protection plate 15 is located on the outer surface of the upper bracket 16, the lower bracket 18 is provided with a groove for mounting the negative bus aluminum plate, the lower insulating protection plate 17 is located on the outer surface of the lower bracket 18, the BMS protection plate 11 is located on the top of the plurality of battery cells 12, the top insulating protection plate 10 is located on the outer surface of the BMS protection plate 11, the positive electrodes of the battery cells 12 are welded to the positive bus aluminum plate 13 together by using aluminum wires 23 and electrically connected to the positive bus aluminum plate 13, the cathodes of the battery cells 12 are commonly welded to the cathode confluence aluminum plate by using aluminum wires 23 and are electrically connected through the cathode confluence aluminum plate. It can be understood that the upper bracket 16 is provided with a plurality of grooves for installing a plurality of anode bus aluminum plates 13, the upper ends of the anode bus aluminum plates 13 are flush with the outer surface of the upper bracket 16, and the structure is also applicable to the lower bracket 18. In addition, the lithium ion battery pack 100 further includes fasteners 20, by which the BMS protection plate 11 is fixed to the upper and lower brackets 16 and 18, thereby making the BMS protection plate 11 stably fixed.

In a preferred embodiment, a first bonding layer is arranged between the positive electrode confluence aluminum plate 13 and the upper bracket 16, and a first bonding layer is arranged between the lower bracket 18 and the negative electrode confluence aluminum plate, that is, glue is added into the groove, the positive electrode confluence aluminum plate 13 and the upper bracket 16 are fixed through the effect of the first bonding layer, and the lower bracket 18 and the negative electrode confluence aluminum plate are fixed, so that the bonding is firmer and is not easy to loosen. In an embodiment, the positive electrode bus aluminum plate 13 and the upper bracket 16, and the lower bracket 18 and the negative electrode bus aluminum plate can be bonded and positioned by using AB glue, and are fixed stably and cannot fall off.

In a preferred embodiment, the upper rack 16 and the lower rack 18 cooperate to form an area in which several cells 12 are positioned. An upper positioning groove is arranged on the upper support 16, a lower positioning groove 22 is arranged at a corresponding position of the lower support 18 (the upper positioning groove structure refers to the lower positioning groove 22 structure), and when the upper support 16 and the lower support 18 are matched, the battery core 12 is positioned between the upper support 16 and the lower support 18 through the action of the upper positioning groove and the lower positioning groove 22. Further, a second adhesive layer is disposed between the battery cell 12 and each of the upper bracket 16 and the lower bracket 18. It is understood that the upper positioning slot has a second adhesive layer for fixing the battery cell 12 to the upper bracket 16, and the lower positioning slot 22 has a second adhesive layer for fixing the battery cell 12 to the lower bracket 18. Specifically, UV glue is added to the upper positioning groove and the lower positioning groove 22, the battery cell 12 is inserted and cured to form a whole, the battery cell 12 does not shake in the region formed between the upper bracket 16 and the lower bracket 18, and the structural strength is high. In order to improve the stability, a fence structure 19 for positioning the plurality of battery cells 12 is disposed between the upper support 16 and the lower support 18, the fence structure 19 has a receiving cavity, and the plurality of battery cells 12 are located in the fence structure 19.

In a preferred embodiment, the upper and lower brackets 16 and 18 are provided with a plurality of through holes 21 corresponding to the positive and negative electrodes of the battery cell 12, respectively. The tab of the positive electrode of the cell 12 is exposed through the through hole 21 to be welded by the aluminum wire 23, and similarly, the tab of the negative electrode of the cell 12 is exposed through the through hole 21 to be welded by the aluminum wire 23. In this embodiment, the diameter of the aluminum wire 23 is 0.38mm, but not limited thereto. The serial connection or the parallel connection between the electric cores 12 is realized by the aid of the aluminum wires 23 in an ultrasonic welding mode, so that a resistance welding mode is avoided, and splashing and oxidation phenomena generated in resistance welding are effectively avoided. In the embodiment, the aluminum plate is used as a current bus conductor of the positive bus aluminum plate 13 or the negative bus aluminum plate, so that the overcurrent capacity is enhanced. Aluminum wire 23 and anodal aluminum plate 13 or the negative pole aluminum plate that converges constitute the conductor jointly, in charging process, when causing the inside short circuit of electric core 12 because of overcharging, cause to take place thermal runaway and short circuit heavy current, aluminum wire 23 can in time fuse the thermal runaway source, in time blocks that electric core 12 of whole group battery is inefficacy.

By adopting the lithium ion battery pack 100, the upper bracket 16 and the anode bus aluminum plate 13 and the lower bracket 18 and the cathode bus aluminum plate are fixed by the first bonding layer, so that the bonding is firm and the looseness is not easy to occur. The battery cell 12 is fixed with the upper bracket 16 and the lower bracket 18 by using a second bonding layer, so that the battery cell is integrated, is not easy to shake and has high structural strength. Anodal aluminum plate 13 and the negative pole aluminum plate that converges adopt aluminum plate as the conductor that converges, and the current capacity is strong, adopts supersound aluminium silk 23 welding with the help of aluminium silk 23, can not cause the injury to electric core 12 surface, avoids electric core 12 inside impaired, and simultaneously, when the overcurrent, aluminium silk 23 can melt, guarantees safety.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, therefore, the invention is not limited thereto.

Claims (7)

1. A lithium ion battery pack is characterized by comprising a top end insulation protection plate, a BMS protection plate, a plurality of electric cores, an anode confluence aluminum plate, a cathode confluence aluminum plate, an upper insulation protection plate, an upper support, a lower insulation protection plate and a lower support, wherein the electric cores are arranged side by side and are positioned between the upper support and the lower support, the upper support is provided with a groove for mounting the anode confluence aluminum plate, the upper insulation protection plate is positioned on the outer surface of the upper support, the lower support is provided with a groove for mounting the cathode confluence aluminum plate, the lower insulation protection plate is positioned on the outer surface of the lower support, the BMS protection plate is positioned at the top of the electric cores, the top end insulation protection plate is positioned on the outer surface of the BMS protection plate, and the anode of each electric core is welded to the anode confluence aluminum plate by adopting an aluminum wire and is electrically connected with the anode confluence aluminum plate, and the negative electrodes of the battery cores are welded to the negative electrode confluence aluminum plate together by adopting aluminum wires and are electrically connected through the negative electrode confluence aluminum plate.

2. The lithium ion battery of claim 1, wherein a first adhesive layer is disposed between the upper support and the positive bus aluminum plate, and between the lower support and the negative bus aluminum plate.

3. The lithium ion battery pack of claim 1, wherein the upper support and the lower support cooperate to form a region in which a number of the cells are positioned.

4. The lithium ion battery pack according to claim 1, wherein the upper holder and the lower holder are provided with through holes corresponding to the positive electrode and the negative electrode of the cell, respectively.

5. The lithium ion battery pack of claim 1, wherein a rail structure is disposed between the upper support and the lower support for positioning a plurality of the cells.

6. The lithium ion battery pack of claim 1, wherein a second adhesive layer is disposed between the cell and each of the upper and lower supports.

7. The lithium ion battery pack of claim 1, further comprising a fastener by which the BMS protection plate is fixed to the upper and lower brackets.

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