CN207651575U - Cell fixing device - Google Patents

Abstract

The utility model provides a battery fixing device, which includes a plurality of groups of small battery cells, the small battery cells are formed by stacking positive electrodes, negative electrodes, and isolation films, and connecting devices are installed around the small battery cells , the connecting device includes a clamping groove, one end of both sides of the clamping groove is provided with a groove, and the other end is provided with a boss matching the groove. The battery fixing device fixes the single battery cells to each other, and also fixes the battery as a whole, so that the structure is fastened. If there is a problem with a single battery cell, it is easy to replace and can achieve Timely and effective solutions will not have a great impact on other battery cells. At the same time, the fixed battery cells can make the connection more effective when the tabs are out on the same side or when the tabs are out from the end.

Description

battery holder

technical field

The utility model relates to a laminated battery, in particular to a battery fixing device.

Background technique

At present, the positive tab lead-out foil of lithium-ion batteries, the positive electrode is left in the coating process according to the design requirements, and a part of the empty foil is used as the current conduction part of the positive plate, and is used for welding between the tabs after the lamination is completed. It is usually aluminum foil with a thickness of 10-40um. Negative tab lead-out foil: a part of the negative foil that needs to be left during the coating process according to the design, is used as the current conduction part of the negative plate, and is used for welding between the tabs after the lamination is completed, usually copper foil, The thickness is 8-40um.

At present, in the power lithium-ion battery, the more common forming methods of the monomer are mainly lamination and winding to effectively separate the positive electrode sheet and the negative electrode sheet through the separator, while ensuring effective and close contact between them.

The existing stacking methods mainly include tabs on the same side or tabs on the end and the end.

With the rapid development of power batteries, existing technical solutions cannot meet the needs of high-energy and high-power power batteries. The defect is that when there are too many layers of positive and negative electrode laminations, due to the increase in the number of layers at the tab welding point, the tab welding effect is poor, and the outermost tab foil is often welded through, while the inner foil is not The welding is not firm, and there is a phenomenon of virtual welding. This will directly lead to an increase in battery impedance, which will seriously affect the performance of the battery. At the same time, with the increase in the number of welding layers, the overall thickness of the tab foil after pre-welding is thicker, which increases the difficulty of cutting, and also increases the number of burrs on the cross-section after cutting, and burrs are important for the safety of lithium-ion batteries. It is a deadly threat. The light one will cause the self-consumption of the lithium-ion battery to increase, and the battery life will be greatly reduced. The severe one will cause the internal short circuit of the battery itself, resulting in fire and explosion. Therefore, it is necessary to strictly control the generation of burrs on the end surface of the foil after cutting.

Generally speaking, stacked batteries have the following characteristics: 1: The size is relatively flexible, and can be made into triangles, circles, etc. 2: Mechanization is not easy to achieve. 3: The pole piece should be punched, with many cross-sections, easy to pierce the diaphragm, easy to short circuit, and easy to produce side reactions. 4: The tension of the battery is not easy to control. 5: Pole pieces are easy to check or select.

Utility model content

The utility model provides a battery fixing device, which solves the fixing problem of laminated batteries, and its technical scheme is as follows:

A battery fixing device, comprising a plurality of groups of small battery cells, the small battery cells are formed by laminating positive electrodes, negative electrodes, and separators, and connecting devices are installed around the small battery cells, and the connecting devices The device includes a clamping groove, one end of both sides of the clamping groove is provided with a groove, and the other end is provided with a boss matching the groove.

The connecting end of the clamping groove is provided with a second groove, and connecting bodies are arranged around the battery, and plugs are uniformly arranged on the connecting body for inserting into the second groove.

The inside of the clamping groove is made of elastic material for clamping the battery cell.

The two ends of the clamping groove have the same length, which is 0.5cm-1.5cm, and the width is 0.5cm.

The length of the connecting end is within 0.5cm.

The shape of the groove is circular, rectangular or triangular, and the corresponding boss structure is circular, rectangular or triangular.

1-3 sets of connection devices are installed on each side of the small battery cell.

The battery fixing device fixes the single battery cells to each other, and also fixes the battery as a whole, so that the structure is fastened. If a battery cell has a problem, it is easy to replace and can achieve Timely and effective solutions will not have a great impact on other battery cells. At the same time, the fixed battery cells can make the connection more effective when the lugs are on the same side or the ends are on the same side.

Description of drawings

Fig. 1 is a schematic structural view of the battery fixing device;

Fig. 2 is a schematic cross-sectional structure diagram of the connecting device.

Detailed ways

As shown in Figure 1, the battery fixing device includes multiple sets of small battery cells 1. The small battery cells 1 are formed by stacking a positive electrode 11, a negative electrode 12, and a separator. The positive electrode 11 leads to a positive electrode connection 13, and the negative electrode 12 draws the negative connection 14. A connecting device 3 is installed around the small battery cell 1, and the connecting device 3 includes a clamping groove, the clamping groove is formed by a connecting end and two side ends connected with the connecting end, and the two side ends of the clamping groove A groove 32 is provided on the outside of one side end, and a boss 33 matching the groove is arranged on the outside of the other side end. A second groove 31 is provided on the connecting end of the clamping groove, and connectors 2 are arranged around the battery, and plugs 21 are uniformly arranged on the connector 2 for inserting into the second groove 31 .

The inside of the clamping groove is made of elastic material for clamping the battery cell.

Wherein, the two ends of the clamping groove have the same length, which is 0.5 cm, and the width is 0.5 cm. The connecting end is used to connect both sides of the clip groove, and the length is within 0.5cm.

The shape of the groove 32 is circular, rectangular or triangular, and the structure of the corresponding boss 33 is circular, rectangular or triangular.

Two sets of connection devices are installed on each side of the small battery cell.

Each small battery cell is connected to the adjacent small battery cell through the connection device 3, through the cooperation of the groove 32 and the boss 33, and then the overall connection is fixed through the connecting body 2, so that the connection is tight , and does not affect the same side of the tab or the end of the tab.

The battery fixing device fixes the single battery cells to each other, and also fixes the battery as a whole, so that the structure is fastened. If a battery cell has a problem, it is easy to replace and can achieve Timely and effective solutions will not have a great impact on other battery cells. At the same time, the fixed battery cells can make the connection more effective when the lugs are on the same side or the ends are on the same side.

Claims (7)

1. A battery fixing device, characterized in that: it includes multiple groups of small battery cells, the small battery cells are formed by stacking positive poles, negative poles, and separators, and the surroundings of the small battery cells are installed with A connecting device, the connecting device includes a clamping groove, one end of both sides of the clamping groove is provided with a groove, and the other end is provided with a boss matching the groove. 2. The battery fixing device according to claim 1, characterized in that: a second groove is arranged on the connecting end of the clamp groove, connecting bodies are arranged around the battery, and the connecting bodies are evenly arranged with A plug for inserting into the second groove. 3. The battery fixing device according to claim 1, characterized in that: the inside of the clamping groove is made of elastic material for clamping the single battery cell. 4. The battery fixing device according to claim 1, characterized in that: both ends of the clamping groove have the same length of 0.5cm-1.5cm, and a width of 0.5cm. 5. The battery fixing device according to claim 1, wherein the length of the connecting end is within 0.5 cm. 6. The battery fixing device according to claim 1, wherein the shape of the groove is circular, rectangular or triangular, and the corresponding boss structure is circular, rectangular or triangular. 7. The battery fixing device according to claim 1, wherein 1-3 sets of connecting devices are installed on each side of the small battery cell.