CN201345384Y - Battery pack - Google Patents

Abstract

The utility model discloses a battery pack, which comprises a plurality of single cells and battery connection pieces; the battery connection pieces are connected in series, parallel or mixed connection between the single cells; grooves are arranged on the surface of the battery connection pieces, and when mechanical The breakage of the groove after the external force plays a safety role; the adoption of the above structure effectively reduces the probability of the connecting piece of the battery unit cell being squeezed into the battery, thereby reducing the hidden danger of the internal short circuit of the battery. The utility model has a simple structure and is easy to process. , At the same time, it also solves the problem of excessive internal resistance when the battery is connected and the problem of insufficient battery conduction area.

Description

a battery pack

technical field

The utility model relates to batteries, in particular to a battery pack.

Background technique

With the improvement of human awareness of environmental protection, it will be an inevitable trend in the future that electric vehicles (EV) and hybrid vehicles (HEV) will replace the current fuel vehicles. As the core power source of electric vehicles - the power battery pack, its importance is particularly prominent.

As we all know, the power battery pack is composed of multiple single cells in a certain way, so the safety performance requirements for the connection parts between the single cells are quite high; most batteries on the market currently use sheet-shaped connecting sheets Connected with other power batteries, such a connection battery short circuit and other safety hazards are very serious.

Utility model content

The inventor of the present utility model has found through many times of research and experiments that the ordinary battery connecting piece of the existing battery is very easy to be directly penetrated into the battery when it is hit, causing potential safety hazards such as battery short circuit.

The purpose of the utility model is to overcome the defect of relatively high short-circuit rate of traditional batteries, and provide a battery pack with low short-circuit rate of batteries.

The utility model provides a battery pack, which includes several single batteries and battery connecting pieces;

The single batteries are connected in series or in parallel or in combination by battery connecting pieces;

There is a groove on the surface of the battery connecting piece, and the groove breaks when subjected to an external mechanical force to play a safety role.

The utility model provides a battery pack, the battery packs are connected by battery connecting pieces, the battery connecting pieces are provided with grooves, which effectively reduces the probability that the connecting pieces are squeezed into the inside of the battery, and the utility model has a simple structure and is easy to process. It is convenient, and at the same time, it also solves the problem of excessive internal resistance when the battery is connected and the problem of insufficient battery conduction area.

Description of drawings

A schematic structural view of a battery pack (2 single cells) provided by the utility model of Fig. 1;

Fig. 2 is a structural schematic diagram of another battery pack (composed of 2 single cells) provided by the utility model.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The utility model takes the lithium ion battery as an example. It mainly describes the power battery that provides power for automobiles, etc.

Example 1:

As shown in Figures 1 to 2, the utility model provides a battery pack, including a number of single cells and battery connecting pieces 1, and the battery connecting pieces 1 are connected in series or in parallel or in combination between the single batteries; They are connected in series, one battery connection piece 1 of one battery is connected to the battery connection piece 1 of the opposite polarity of an adjacent battery, and the other battery connection piece 1 is connected to the battery of the opposite polarity of another adjacent battery Connection piece 1 is connected. The way of connecting single batteries in series includes but not limited to the following ways: the negative terminal (not shown) of the battery at one end is connected to the positive terminal (not shown) of the adjacent battery, or the positive terminal of the battery at one end is connected to The negative terminals of adjacent batteries are connected, and so on, and a pair of battery connecting pieces 1 with opposite polarities of two adjacent batteries are welded, so that the two batteries at both ends of the battery pack obtained have a battery connecting piece 1 respectively. Connect with other battery connection pieces 1, and the polarity of these two battery connection pieces 1 is opposite, as the positive and negative poles of the battery pack.

The connection mode between the battery connecting pieces 1 is pasting, as long as the battery connecting pieces 1 to be connected are pasted together and there is a certain connection strength between the battery connecting pieces 1, preferably, the battery connecting pieces 1 1 welding. Welding can be various existing welding methods, such as cold pressure welding, ultrasonic welding, laser welding, brazing, flash butt welding, friction welding, resistance welding, etc., preferably cold pressure welding. The use of cold pressure welding only needs to provide sufficient static pressure to achieve reliable welding, and the welded object has low heat generation, no vibration and no relative displacement during the welding process.

或

形。当电池连接片1受到外部撞击时，电池连接片1的凹槽2部位首先开始向内变形，当电池连接片1变形量达到一定程度时，(外部的撞击力就被电池连接片1吸收了，故电池连接片1不易被插入电池内部，同时由于电池连接片1的形状特点，电池连接片1被盖板上的绝缘件阻挡，电池连接片1同样也很难被插入电池内部，)电池连接片1出现断裂的现象，这样整个动力电池就处于一种断路状态，故电池就不会发生短路、燃烧、爆炸安全事故，从而提高了单体电池的安全性。The shape of the battery connecting piece 1 of the present utility model is

or

shape. When the battery connecting piece 1 is subjected to external impact, the groove 2 of the battery connecting piece 1 first begins to deform inwardly, and when the deformation of the battery connecting piece 1 reaches a certain level, (the external impact force is absorbed by the battery connecting piece 1 , so the battery connection piece 1 is not easy to be inserted into the battery, and due to the shape of the battery connection piece 1, the battery connection piece 1 is blocked by the insulating part on the cover plate, and the battery connection piece 1 is also difficult to be inserted into the battery.) battery The connecting piece 1 breaks, so that the whole power battery is in an open circuit state, so the battery will not have short circuit, burning, explosion safety accidents, thereby improving the safety of the single battery.

In the battery connecting piece 1 provided by the utility model, the groove 2 can be prepared by any well-known method in the mechanical field, or can be made by stamping; the depth of the groove 2 is 10% of the thickness of the battery connecting piece 1 -95%; the length of the groove 2 is 50%-100% of the width of the battery connection piece 1; the number of grooves 2 on the battery connection piece 1 is one or more.

The length direction of the battery connection piece 1 is the X direction, the width direction is the Y direction, and forms an angle of 0-60 degrees with the battery connection piece 1 along the Y direction; the angle is preferably 0 degrees, that is, the groove 2 is located on the battery connection piece 1Y direction.

The thickness of the battery connection sheet 1 can be determined according to the type of battery and the preparation requirements. According to a specific embodiment of the present utility model, the thickness of the battery connection sheet 1 is 0.2-20 mm, preferably 2.5 mm.

The width of the battery connection piece 1 can be determined according to the type of battery and the preparation requirements. According to a specific embodiment of the present utility model, the width of the battery connection piece 1 is 2-20 mm, preferably 5 mm.

The battery connection sheet 1 can be made of various conductive materials known in the art, such as pure copper or pure aluminum; it can be determined according to the battery model;

The groove 2 is provided with soft and conductive fillers with a certain bonding strength, such as tin, conductive plastic, conductive rubber and the like.

The battery connection sheet 1 provided by the utility model can be used for various batteries, such as secondary batteries.

Example 2:

Referring to Fig. 2, the utility model provides another battery pack, including several single cells and battery connecting pieces 1, and the battery connecting pieces 1 are connected in series or in parallel or in combination between the single cells

The battery connection pieces 1 are connected by welding, and the shape of the battery connection piece 1 of the present invention is a strip. When the battery connection piece 1 is impacted by the outside, the groove 2 of the battery connection piece 1 first begins to deform inwardly. When the deformation of the battery connection piece 1 reaches a certain level, the groove 2 is located on the battery connection piece 1 and breaks along the Y direction. , so that the entire power battery is in an open circuit state, so the battery will not have short-circuit, combustion, and explosion safety accidents, thereby improving the safety of the single battery

The power battery pack provided by the utility model also includes other necessary components required by the battery pack, and the assembly method of the battery pack is well known to those skilled in the art, and will not be repeated here.

Although the present invention has been described with reference to particular embodiments thereof, those skilled in the art will understand that changes may be made in form and detail without departing from the spirit and scope of the invention as defined in the appended claims. Make various changes.

Claims (8)

1. A battery pack, including several single cells and battery connecting pieces; The single batteries are connected in series or in parallel or in combination by battery connecting pieces; It is characterized in that a groove is provided on the surface of the battery connecting sheet, and the groove is broken to play a safety role when subjected to mechanical external force. 2. A battery pack according to claim 1, characterized in that: the thickness of the battery connecting piece is greater than 0.2 mm; the width of the battery connecting piece is greater than 2 mm. 3. A battery pack according to claim 1, characterized in that: the depth of the groove of the battery connecting piece is 10%-95% of the thickness of the battery connecting piece; the length of the groove of the battery connecting piece is 50%-100% of width. 4. A battery pack as claimed in claim 1, characterized in that: the length direction of the battery connection piece is in the X direction, the width direction is in the Y direction, and the angle between the groove and the Y direction of the battery connection piece is 0-60 degrees. angle. 5. A battery pack as claimed in claim 4, wherein the groove forms an included angle of 0° with the Y direction of the battery connecting piece. 6. A battery pack as claimed in claim 1, wherein a filler is provided in the groove. 7. A battery pack according to claim 6, wherein the filler is tin or conductive plastic or conductive rubber. 8. A battery pack according to claim 1, characterized in that there are one or more grooves on the battery connection piece.

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