CN218919053U - Cells and power equipment - Google Patents

Abstract

The utility model provides a battery cell and power equipment, wherein the battery cell comprises a shell with at least one end arranged in an open mode, a pole group body accommodated in the shell, and a cover plate for blocking the open mode, wherein an explosion-proof device is arranged on the cover plate, an insulating heat conducting layer is filled between the pole group body and the shell, and an exhaust channel penetrating through the pole group body in the length direction is arranged on the insulating heat conducting layer. According to the battery cell, the insulating heat conducting layer is filled between the periphery of the electrode group body and the shell, so that the heat radiating effect of the electrode group body is improved, the temperature of the electrode group body is reduced, the probability of thermal runaway of the battery cell is reduced, and the safety performance of the battery cell is improved; and through the exhaust passage on the insulating heat conduction layer, the gas in the battery cell is discharged through the explosion-proof device, so that the safety of the battery cell is improved.

Description

Cells and power equipment

technical field

The utility model relates to the technical field of power batteries, in particular to an electric core. At the same time, the utility model also relates to a power device with the electric core.

Background technique

Lithium-ion batteries have become the representative of modern high-performance batteries because of their high operating voltage, high specific energy, large capacity, small self-discharge, good cycle performance, long service life, light weight, and small size. High energy density and high safety performance are the most important indicators of lithium-ion batteries and the key to restricting the development of lithium-ion batteries.

The most widely used electrolyte system in lithium-ion batteries is the mixed carbonate solution of LiPF6. This kind of solvent has high volatility, low flash point and is very flammable. When impact or deformation causes internal short circuit, high-rate charge and discharge and overcharge, a large amount of heat will be generated, which will cause the battery temperature to rise. When a certain temperature is reached, a series of chemical reactions will be triggered, which will destroy the thermal balance of the battery. If the heat cannot be evacuated in time, the reaction will be intensified, and a series of self-heating side reactions will be triggered, and the battery temperature will rise sharply. Thermal runaway occurs, eventually causing the battery to burn, and even explode in severe cases. In the prior art, methods such as adding flame retardant additives, overcharge additives, using fluorine-containing solvents, and installing explosion-proof valves are usually used to solve the problem of battery temperature rise.

In addition, the current basic structure of a lithium-ion cell is: a shell, an electrode group (electrode assembly), a bare cell insulation sheet, a cover plate (usually equipped with a pole, a liquid injection hole), an explosion-proof mechanism, etc., the shell And the cover plate constitutes a closed space for accommodating the electrode assembly, and there is a large gap between the electrode group and the casing, which affects the heat dissipation of the battery cell.

Utility model content

In view of this, the utility model aims to propose a battery cell to improve the heat dissipation and exhaust effect of the battery cell, and further improve the safety of the battery cell.

In order to achieve the above object, the technical solution of the utility model is achieved in that:

An electric core, the electric core comprises a casing with at least one end open, an electrode group body accommodated in the casing, and a cover plate for blocking the opening, the cover plate is provided with explosion-proof device;

An insulating and heat-conducting layer is filled between the electrode group body and the housing, and an exhaust channel is provided on the insulating and heat-conducting layer along the length direction of the electrode group body.

Further, the exhaust passages are arranged in multiples at intervals along the circumference of the pole group body.

Further, the area of the plurality of exhaust passages located on the same side is 60-70% of the area of the corresponding side of the pole group body.

Further, the insulating and heat-conducting layer is provided with a plurality of through holes through its thickness direction, and the through holes communicate with the exhaust channel.

Further, a plurality of through holes are arranged on the insulating and heat-conducting layer at intervals along the length direction of the pole group body.

Further, the exhaust channel is a groove provided on the side of the insulating and heat-conducting layer facing the housing;

The height of the groove is 1/3˜1/2 of the thickness of the insulating and heat-conducting layer.

Further, the insulating and heat-conducting layer is in interference fit with the pole group body and the casing;

And/or, the thickness of the insulating and heat-conducting layer ranges from 0.4 to 0.5 mm.

Further, the insulating and heat-conducting layer is fixedly connected to the pole group body and/or the housing in a hot-melt manner.

Further, the insulating and heat-conducting layer is made of heat-conducting silica gel or heat-conducting silicone grease.

Compared with the prior art, the utility model has the following advantages:

The battery cell described in the utility model is filled with an insulating and heat-conducting layer between the pole group body and the shell, which is beneficial to improve the heat dissipation effect of the pole group body, thereby reducing the temperature of the pole group body and reducing the occurrence of thermal runaway of the battery cell. probability, which in turn helps to improve the safety performance of the battery core; and through the exhaust channel on the insulating heat-conducting layer, it is beneficial for the gas inside the battery core to be discharged through the explosion-proof device, thereby improving the safety of the battery core.

In addition, multiple exhaust channels are beneficial to improve the exhaust efficiency inside the cell. The setting of the area occupied by the exhaust channel is beneficial to improve the exhaust efficiency and is convenient for layout and implementation. The arrangement of the through holes is beneficial to further improving the exhaust efficiency. The through holes are arranged at intervals along the length direction of the pole group body, which is convenient for arrangement and implementation, and has a good exhaust effect. The groove has a simple structure and is convenient for processing and forming.

In addition, the interference fit of the insulating and heat-conducting layer is conducive to improving the heat conduction efficiency between the electrode group body and the shell. The insulating and heat-conducting layer is fixed in the form of thermal fusion, which is convenient for layout and implementation, and the connection effect is good. Thermally conductive silica gel or thermally conductive silicone grease are mature products with good insulation and thermal conductivity.

In addition, another object of the present utility model is to provide a power device, wherein the power device is provided with the above-mentioned electric core.

The power equipment described in the utility model is provided with the electric core as described above, which is beneficial to improve the cooling performance and safety performance of the power equipment, and has better practicability.

Description of drawings

The accompanying drawings constituting a part of the utility model are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model, and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 is a schematic structural view of the insulating and heat-conducting layer described in the embodiment of the present invention;

Explanation of reference signs:

1. Insulation and heat conduction layer; 101, exhaust channel; 102, through hole.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

In the description of the present utility model, it should be noted that if there are terms such as "upper", "lower", "inner", "back", etc. indicating orientation or positional relationship, it is based on the orientation or position shown in the drawings. The relationship is only for the convenience of describing the utility model and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the utility model. In addition, if terms such as "first" and "second" appear, they are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

This embodiment relates to the overall structure of an electric core. The electric core includes a casing with at least one end open, an electrode group body accommodated in the casing, and a cover plate for sealing the opening. The cover plate is provided with Explosion-proof device. An insulating and heat-conducting layer 1 is filled between the pole group body and the housing, and an exhaust channel 101 is provided on the insulation and heat-conducting layer 1 along the length direction of the pole group body.

Based on the overall introduction above, an exemplary structure of the insulating and heat-conducting layer 1 in this embodiment is shown in FIG. 1 . The battery cell in this embodiment is a blade battery cell in the prior art, and both ends of the casing have cover plates, and an explosion-proof device is provided on one of the cover plates. Of course, the battery cell in this embodiment can also be an existing There is a square electric core in the technology, at this time, one end of the casing has a cover plate and an explosion-proof device. Wherein, the explosion-proof device in this embodiment can adopt mature products in the prior art, for example, the explosion-proof device adopts an explosion-proof valve, etc., and the product is mature, which is conducive to improving the safety of the battery cell. In this embodiment, the gas exhausted from the exhaust channel 101 is specifically exhausted out of the cell through the explosion-proof valve.

The body of the pole group in this embodiment is in the shape of a cuboid as a whole, and the insulating and heat-conducting layer 1 is wrapped outside the body of the pole group. Set directly to have a better wrapping effect. During specific implementation, preferably, the insulating and heat-conducting layer 1 is fixed on the pole group body and/or the shell by means of thermal fusion. In addition, the insulating and heat-conducting layer 1 has an interference fit with the pole group body and the housing, which is beneficial to improve the heat conduction effect between the pole group body and the housing, thereby facilitating the transfer of heat generated by the pole group body to the housing, thereby improving the efficiency of the pole group. The heat dissipation effect of the group body is beneficial to improve the safety of the battery cell in use.

In this embodiment, the thickness of the insulating and heat-conducting layer 1 ranges from 0.4 to 0.5 mm, for example, the thickness is 0.4 mm, 0.45 mm or 0.5 mm. During specific implementation, the thickness of the insulating and heat-conducting layer 1 can also be selected according to the distance between the pole group body and the casing.

In order to improve the exhaust efficiency, the exhaust passages 101 in this embodiment are arranged at intervals along the circumference of the pole group body, and the area of the multiple exhaust passages 101 on the same side is 60% of the area of the corresponding side of the pole group body. ~70%. During specific implementation, the exhaust channel 101 is a groove provided on the side of the insulating and heat-conducting layer 1 facing the housing, and the height of the groove is 1/3 to 1/2 of the thickness of the insulating and heat-conducting layer 1 . For example, the height of the groove is 1/3 or 1/2 of the thickness of the insulating and heat-conducting layer 1 . Such arrangement facilitates the processing and arrangement of the exhaust channel 101 on the insulating and heat-conducting layer 1 , and at the same time facilitates the improvement of the exhaust efficiency of the insulating and heat-conducting layer 1 in use.

In order to further improve the exhaust efficiency of the insulating and heat-conducting layer 1 in use, in this embodiment, as shown in FIG. The exhaust channels 101 are connected. As a preferred implementation manner, a plurality of through holes 102 are arranged at intervals on the insulating and heat-conducting layer 1 along the length direction of the pole group body.

The insulating and heat-conducting layer 1 in this embodiment is made of heat-conducting silica gel or heat-conducting silicone grease, both of which have good insulation and heat-conducting effects, thereby helping to improve the safety and heat dissipation effect of the battery cell.

When assembling the battery cell described in this embodiment, first weld the negative electrode lug on the pole group body to the negative pole post, then wrap the insulating and heat-conducting layer 1 on the outside of the pole group body, and then install the positive cover plate to seal the insulation The heat conduction layer 1 is respectively bonded and fixed with the positive electrode cover plate and the plastic under the negative electrode cover plate by hot melting, and finally the electrode group body is put into the shell.

In addition, the insulating and heat-conducting layer 1 of this embodiment can also be knotted with fluid materials. Firstly, the pole group body that has been welded to the negative pole post is put into the casing, and before the positive pole lug is welded to the pole post, it is put into the casing. The gap between the pole group body and the pole group body is pressure-filled with a fluid insulating and heat-conducting material, which is then solidified and formed, and is well filled between the shell and the pole set body to achieve good contact between the pole set body and the shell. Greatly improve heat conduction efficiency.

The battery cell described in this embodiment is filled with an insulating and heat-conducting layer 1 between the pole group body and the casing, which is beneficial to improving the heat dissipation effect of the pole group body, thereby helping to reduce the temperature of the pole group body and reducing thermal runaway of the battery cell probability, which in turn helps to improve the safety performance of the battery cell; and through the exhaust channel 101 on the insulating and heat-conducting layer 1, the gas inside the battery core is facilitated to be discharged through the explosion-proof device, thereby improving the safety of the battery core. In addition, the insulating and heat-conducting layer 1 can also have a good insulating effect, reduce the occurrence of short circuit problems between the electrode group body and the casing, and further help to improve the safety performance of the battery cell. In addition, the insulating and heat-conducting layer 1 in this embodiment can greatly improve the lamination effect between the electrode group body and the casing, so that the heat generated by the electrode group body due to the electrochemical reaction is introduced into the casing through heat conduction in time, and then the heat is dissipated through thermal diffusion. Diffusion out greatly reduces the opening rate of the explosion-proof valve and effectively guarantees the safety of the battery cell.

In addition, the present embodiment also relates to a power device, the power device is provided with the battery cell as described above. The power equipment described in this embodiment can be a battery module or a battery pack, etc. By setting the above-mentioned batteries, it is beneficial to improve the cooling performance and safety performance of the power equipment, and has better practicability.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (10)

1. The utility model provides an electric core which characterized in that: the battery cell comprises a shell with at least one end arranged in an open way, a pole group body accommodated in the shell, and a cover plate for blocking the open way, wherein an explosion-proof device is arranged on the cover plate;

an insulating heat conducting layer is filled between the pole group body and the shell, and an exhaust channel which is communicated with the pole group body along the length direction is arranged on the insulating heat conducting layer.

2. The cell of claim 1, wherein:

the exhaust passage is a plurality of arranged at intervals along the circumferential direction of the pole group body.

3. A cell according to claim 2, characterized in that:

the areas of the exhaust channels on the same side are 60-70% of the corresponding side areas of the pole group body.

4. The cell of claim 1, wherein:

the insulating heat conduction layer is provided with a plurality of through holes which are communicated with the exhaust channel.

5. The cell of claim 4, wherein:

the through holes are arranged on the insulating heat conducting layer at intervals along the length direction of the pole group body.

6. The cell of claim 1, wherein:

the exhaust channel is a groove arranged on one side of the insulating heat conducting layer, which faces the shell;

the height of the groove is 1/3-1/2 of the thickness of the insulating heat conducting layer.

7. The cell of claim 1, wherein:

the insulating heat conducting layer is in interference fit with the pole group body and the shell;

and/or the thickness range of the insulating heat conducting layer is 0.4-0.5 mm.

8. The cell of claim 1, wherein:

the insulating heat conducting layer is fixedly connected to the pole group body and/or the shell in a hot melting mode.

9. The cell of any one of claims 1 to 8, wherein:

the insulating heat conduction layer is made of heat conduction silica gel or heat conduction silicone grease.

10. A power plant, characterized by: the power equipment is provided with the battery cell as claimed in any one of claims 1 to 9.

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