CN2679860Y - Square lithium ion power battery set - Google Patents

Abstract

A square lithium-ion power battery pack, including a battery body and a battery body fastening device, wherein: the battery body fastening device includes a pressing plate and a connecting belt, and the pressing plate presses the battery body along the arrangement direction of the batteries in the battery body, The battery body is fastened by being connected by connecting straps. The energy density per unit volume of the battery pack is high, safe and reliable in use, the battery pack fixing device has a simple structure and good fastening effect.

Description

Square lithium-ion power battery pack

【Technical field】

The utility model relates to a square lithium ion power battery pack, in particular to the structure of a fastening device of the battery pack.

【Background technique】

In the automobile industry, the development of electric vehicles has always been concerned by people, and the power battery pack, which is the heart of electric vehicles, is the focus of research. In the design and application, strive for the battery pack to be light, small in size, high in energy density and safe in use.

At present, among all kinds of power batteries, lithium-ion batteries have the best performance, and their advantages of high energy density and light weight have become people's first choice. However, most of the lithium-ion power battery packs for electric vehicles at home and abroad are made of cylindrical lithium-ion batteries, which are arranged reasonably and fixedly clamped. This kind of battery pack, no matter how the circular batteries are arranged, there must be a certain gap between the cells. Although this gap is effective for the heat dissipation of the battery, it also causes a waste of space to a large extent and reduces the unit volume of the battery pack. Energy Density. Moreover, it is more troublesome to fix the cylindrical battery, and the fixing device after forming the battery pack is also more complicated. Once the fixing is not good, the battery will be misplaced or short-circuited, which will bring great safety problems. As for the square lithium-ion power battery pack, there is currently no better way to apply it to electric vehicles, especially there is no good fixing device that can not only effectively fasten the battery pack, but also to a certain extent Increase the energy density per unit volume of the battery, so that the power battery pack can reach the safest state of use.

【Content of utility model】

The purpose of the utility model is to provide a square lithium-ion power battery pack with a good fixing device, high energy density per unit volume, and high safety performance.

The technical scheme of the utility model square lithium-ion power battery pack is:

A square lithium-ion power battery pack, including a battery body and a battery body fastening device, wherein: the battery body fastening device includes a pressing plate and a connecting belt, and the pressing plate presses the battery body along the arrangement direction of the batteries in the battery body, The battery body is fastened by being connected by connecting straps.

Further, separators are installed between the contact surfaces of the pressing plate and the connecting strips and the battery body and between the batteries in the battery body.

Still further, the separator is flame-retardant plastic, which can be flame-retardant ABS, flame-retardant polyethylene PE, flame-retardant polypropylene PP, flame-retardant polyvinyl chloride PVC, flame-retardant polystyrene PS and flame-retardant polycarbonate PC. Cooling holes can also be left on the surface of the separator.

The utility model has the advantages of a square lithium-ion power battery pack: the battery pack has high energy density per unit volume, is safe and reliable to use, and the battery pack fixing device has a simple structure and good fastening effect.

Below in conjunction with example with reference to accompanying drawing, the utility model is described in further detail:

【Description of drawings】

Fig. 1 is a combined perspective view of an embodiment of a square lithium-ion power battery pack of the present invention.

FIG. 2 is an exploded view of the components of the square lithium-ion power battery pack shown in FIG. 1 .

Fig. 3 is an exploded view of some parts of the square lithium-ion power battery pack shown in Fig. 1 .

【Detailed ways】

Please refer to FIG. 1 , which is a combined perspective view of an embodiment of a square lithium-ion power battery pack of the present invention. The square lithium-ion power battery pack includes a battery body 1 and a battery body fastening device 2, wherein: the battery body fastening device 2 includes left and right pressure plates 3, 3' and a connecting belt 4, wherein the left and right pressure plates 3, 3 Press the battery body 1 along the arrangement direction of the batteries in the battery body 1 respectively, and connect them to each other by the connecting belt 4 to fasten the battery body. In this battery pack, the front, rear, upper and lower faces of the battery body are all connected with the left pressing plate 3 and the right pressing plate 3' by the connecting belt 4.

Please refer to FIG. 2 , which is an exploded view of the prismatic lithium-ion power battery pack shown in FIG. 1 . In this battery pack, the battery body is composed of six square lithium-ion power batteries arranged in sequence, and separators 5 are installed between each battery and between the left and right pressure plates 3, 3' and the battery; Front and rear dividing plates 6,6' are also housed between the connecting band 4 and the battery of each face. Among them, the partition 5 and the front and rear partitions 6, 6' are flame-retardant plastic materials, which can be flame-retardant ABS, flame-retardant polyethylene PE, flame-retardant polypropylene PP, flame-retardant polyvinyl chloride PVC, flame-retardant polystyrene Any one of PS and flame-retardant polycarbonate PC. Because flame-retardant plastics have flame retardancy, electrical insulation and good mechanical properties, choosing them as separators can not only prevent short-circuiting of the battery, but also prevent combustion when the battery is abnormal, such as liquid leakage, ensuring safety. In addition, the flame-retardant plastic has certain toughness, and when the pressing plate fastens the battery body, it will not cause damage to the battery. For dividing plate 5 or front and rear dividing plate 6,6 ', also leave heat dissipation hole on its surface, in order to be beneficial to the distributing of generating heat in battery pack use.

In the assembly of the square lithium-ion battery pack, six square lithium-ion power batteries are first arranged in sequence, so that the positive and negative poles of each battery are staggered (the direction is shown in Figure 2), so as to facilitate the connection between the batteries. The upper part and the bottom of each battery have added an insulating upper cover 7 and a bottom cover 8, which mainly play an insulating role. Add a separator 5 between each battery, press the batteries together, and install an electrical conductor plate 9 on the two heteropolar poles of adjacent batteries, so that the batteries can be connected in series to form a battery body 1 (as shown in Figure 3) . Then the left and right pressure plates 3, 3' and the two separators are pressed against the battery body from the battery arrangement direction of the battery body 1, that is, the left and right sides, and the front and rear separators 6, 6' are added at the same time. On four sides, the two pressure plates are tightly connected together by connecting straps. Wherein the pressing plate and the connecting band are fastened together by riveting or screwing. At this time, the battery body is firmly clamped by the fastening device to form a battery pack.

After the battery pack is assembled, an insulating cap 10 is installed on the conductive plate 9 at the upper end of the battery body 1 to further insulate and protect the battery pack.

In this square lithium-ion power battery pack, the use of each separator can determine the corresponding size and thickness during design. After the battery pack is pressed and fixed by the pressure plate, it will not move in the battery body, ensuring that the battery body The relative position of each battery in the battery makes the whole battery pack firm and reliable. In the battery pack, the connecting belt 4 can be made of steel belt and other materials, and the surface can be wrapped with a thermoplastic tube to further play the role of insulation protection.

In the volume of the square lithium-ion power battery pack of the utility model, except for the volume occupied by the battery shell and the fastening device, it is basically the volume of the battery storage capacity, so the energy density per unit volume of the battery pack is very high. When applied to electric vehicles, several sets of such battery packs can be used and assembled on the vehicle as required. Compared with other battery packs, they are light in weight, high in energy density, good in firmness, and safe and reliable.

The square lithium-ion power battery pack of the utility model is not limited to the above specific embodiments. The number of batteries in the battery body can be increased or decreased according to actual needs, and can also be arranged in two or more rows according to specific requirements. Just adjust the size of the platen. As for the number of the pressing plates, in addition to ensuring the two along the battery arrangement direction, the front and rear pressing plates can also be added as needed, but this will increase the weight of the battery pack and is not conducive to heat dissipation, so it is not a preferred solution.

The above embodiment is the preferred solution of the present utility model. For those skilled in the art, some changes that may be made to some parts thereof reflect the principle of the present utility model and belong to the protection scope of the present utility model within.

Claims (6)

1. A square lithium-ion power battery pack, comprising a battery body and a battery body fastening device, characterized in that: the battery body fastening device includes a pressing plate and a connecting belt, and the pressing plate presses along the arrangement direction of each battery in the battery body. The battery body is tightly connected by connecting straps so that the battery body is fastened. 2. The square lithium-ion power battery pack according to claim 1, characterized in that: separators are also installed between the contact surfaces of the pressure plate and the connecting belt and the battery body and between the batteries in the battery body. 3. The square lithium-ion power battery pack according to claim 2, characterized in that: the separator is flame-retardant plastic, which can be flame-retardant ABS, flame-retardant polyethylene PE, flame-retardant polypropylene PP, flame-retardant Polyvinyl chloride PVC, flame retardant polystyrene PS and flame retardant polycarbonate PC. 4. The square lithium-ion power battery pack according to claim 2, characterized in that: there are cooling holes on the surface of the separator. 5. The square lithium-ion power battery pack according to claim 1, characterized in that: the pressure plate and the connecting strap are fastened together by riveting or screwing. 6. The square lithium-ion power battery pack according to claim 1, characterized in that: said connection belt is wrapped by a thermoplastic tube.

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