CN205992578U - Have the battery bag of heating and heat sinking function concurrently - Google Patents

Abstract

This utility model discloses a kind of battery bag having heating and heat sinking function concurrently, including the radiating bottom plate corresponding to battery bag casing and described battery bag casing and battery module, described battery module is installed in the space between battery bag casing and radiating bottom plate, it is characterized in, described radiating bottom plate is made using aluminum alloy materials, the upper surface of described radiating bottom plate is provided with heating film, and the bottom of described radiating bottom plate is provided with radiation tooth.In this utility model, the more heat transfer producing during charging and discharging can be reached bottom heat radiation plate by the heat conductive silica gel and PI material that are connected to battery core negative pole by lithium battery module, heat sink bottom is provided with radiation tooth, increasing heat radiation area, it is easy to battery bag to radiate so that battery bag has good heat dispersion；Additionally, can be heated by heating film when external temperature is too low, by heat reverse conduction to battery core, thus reaching control battery module temperature, the effect of protection battery performance.

Description

Battery pack with both heating and cooling functions

technical field

The utility model is designed to provide a battery pack with both heating and heat dissipation functions, which belongs to the field of lithium battery safety and energy storage.

Background technique

With the widespread influence of the world's energy problems and the increasingly prominent environmental pollution problems, the demand for new energy vehicles is increasing. As new energy vehicles, electric vehicles have become the main force of new energy vehicles with their zero exhaust emissions, and batteries are electric One of the core components of automobiles, and lithium-ion batteries have become the dominant power source for electric vehicles and hybrid vehicles because of their advantages such as high voltage, high energy density, good cycle performance and low self-discharge. When using lithium batteries, you need to use batteries The pack connects multiple lithium batteries in parallel to form a complete power supply.

Lithium batteries generate a lot of heat during charging and discharging, so the heat dissipation and temperature control of lithium battery packs are the key to ensure battery performance. The heat dissipation performance of lithium battery packs currently on the market is not high, which has a great impact on the life and safety of lithium batteries.

Contents of the invention

The purpose of this utility model is to solve the above-mentioned problems in the prior art, thereby providing a battery pack with both heating and heat dissipation functions, which solves the problem of the battery module of the automatic battery pack of an electric vehicle due to poor heat dissipation or low external temperature. The temperature is too high, too low or the temperature difference is large, which affects the service life of the battery pack.

The technical solution of the utility model is: a battery pack with both heating and heat dissipation functions, including a battery pack box body, a heat dissipation bottom plate corresponding to the battery pack box body, and a battery module, and the battery module is installed on a battery In the space between the box body and the heat dissipation bottom plate, the heat dissipation bottom plate is made of aluminum alloy material, the upper surface of the heat dissipation bottom plate is provided with a heating film, the bottom of the heat dissipation bottom plate is provided with heat dissipation teeth, and the heating film A layer of PI material is laid on the upper layer and between the lower layers of the battery module, and a layer of thermally conductive silica gel is poured between the PI material and the negative electrode of the battery cell in the battery module.

Further, in the above-mentioned battery pack with both heating and heat dissipation functions, wherein: the cross section of the heat dissipation teeth is a structure of a plurality of rectangles arranged side by side, or the cross section of the heat dissipation teeth is wavy.

Furthermore, in the aforementioned battery pack with both heating and heat dissipation functions, the thickness of the PI material is 0.01-0.04 mm.

Furthermore, in the above-mentioned battery pack with both heating and heat dissipation functions, the thickness of the heat-conducting silica gel is 3-7 mm.

Still further, the above-mentioned battery pack with both heating and heat dissipation functions, wherein: the heating film is a red Teflon wire structure wrapped with two layers of polyimide material.

Still further, in the above-mentioned battery pack with both heating and heat dissipation functions, spacer ribs are provided between the battery modules.

The technical effect of the utility model is mainly reflected in: the lithium battery module in the utility model can transmit more heat generated during charging and discharging to the bottom cooling plate through the heat-conducting silica gel and PI material connected to the negative electrode of the battery cell, and the bottom of the cooling plate is provided with The heat dissipation teeth increase the heat dissipation area, which is convenient for the battery pack to dissipate heat, so that the battery pack has good heat dissipation performance; in addition, when the external temperature is too low, it can be heated by the heating film, and the heat is reversed to the battery cell, so as to control the temperature of the battery module The role of protecting battery performance.

Description of drawings

Fig. 1 is a schematic diagram of the structural design of the air-cooled battery system of the lithium battery of the present invention.

The meanings of the reference marks in the figure are: 1—battery pack box, 2—radiating bottom plate, 3—battery module, 4—radiating teeth, 5—interval ribs, 6—heating film, 7—PI material, 8— Thermal silica gel, 9—cell, 10—screw.

detailed description

Below in conjunction with the accompanying drawings, the specific implementation of the utility model will be further described in detail, so as to make the technical solution of the utility model easier to understand and grasp.

As shown in Figure 1, taking the battery module 3 composed of 18650 cells as an example, there is a pressure relief valve and other structural heat at the positive pole, which can only be conducted from the negative pole. The utility model is a battery pack with both heating and heat dissipation functions. The battery pack box 1. The heat dissipation bottom plate 2 and the battery module 3 corresponding to the battery pack case 1, the battery pack case 1 and the heat dissipation bottom plate 2 are fixedly connected by screws 10, and the battery module 3 is installed in the battery pack case 1 and the space between the cooling base plate 2. The heat dissipation bottom plate 2 is made of aluminum alloy material. The aluminum alloy material has good heat dissipation and can effectively conduct heat. The bottom of the heat dissipation bottom plate 2 is provided with heat dissipation teeth 4 composed of protrusions and recesses. The heat dissipation area of the large heat dissipation bottom plate 2 facilitates the natural air cooling of the battery pack during the running of the vehicle.

As shown in Figure 1, the cross-section of the heat dissipation teeth 4 is a structure in which a plurality of rectangles are arranged side by side. It should be noted here that the shape of the heat dissipation teeth 4 is not fixed. The heat dissipation area of the heat dissipation bottom plate 2 is enough, for example, the cross section of the heat dissipation teeth 4 can also be set in a wave shape.

The aluminum alloy heat dissipation bottom plate 2 is covered with a layer of heating film 6. The heating film 6 is a red Teflon wire structure wrapped with two layers of polyimide material, which has a heating function and has good thermal conductivity when not heating. The heating film 6 is covered with a layer of polyimide (PI material 7 ) with a thickness of 0.01-0.04 mm. This material has low thermal resistance and insulation, which can realize leakage protection and achieve effective heat conduction. A layer of thermally conductive silica gel 8 with a thickness of 3-7 mm is poured between the PI material 7 and the negative electrode of the battery cell 9 in the battery module 3. Since the battery cell 9 is generally supported by a protective bracket, the structure reaches the direct contact with the negative electrode of the battery cell 9. It is difficult to reach the PI material 7, so heat-conducting silica gel 8 is added, and the heat-conducting silica gel 8 directly contacts the negative electrode of the battery cell 9. At the same time, the heat-conducting silica gel 8 has the function of fixing the battery module 3 after solidification.

The battery module 3 is preferably a lithium battery module, and interval reinforcing ribs 5 are provided on the gaps between the battery modules 3 to increase the supporting strength. The thickness of the PI material 7 is preferably 0.02 mm. The thickness of the thermally conductive silica gel 8 is preferably 5 mm.

When the battery module 3 in the battery pack generates a lot of heat due to charging and discharging, it will be transferred to the heat dissipation bottom plate 2 through the heat-conducting silica gel 8 and PI material 7 connected to the negative pole of the battery cell 9, and the bottom of the heat dissipation bottom plate 2 has heat dissipation teeth 4 to increase heat dissipation area, so that the battery pack has a good heat dissipation effect; in addition, when the external temperature is too low, it can be heated by the heating film 6, and the heat is reversely conducted to the battery cell 9 through the PI material 7 and the heat-conducting silica gel 8, thereby achieving the control of the battery module. 3 temperature, the role of protecting battery performance.

Of course, the above are only typical examples of the utility model. In addition, the utility model can also have other various specific implementation modes. within the range.

Claims (7)

1. a kind of battery bag having heating and heat sinking function concurrently, including corresponding to battery bag casing and described battery bag casing Radiating bottom plate and battery module, described battery module is installed in the space between battery bag casing and radiating bottom plate, its feature It is：Described radiating bottom plate is made using aluminum alloy materials, and the upper surface of described radiating bottom plate is provided with heating film, described radiating bottom The bottom of plate is provided with the radiation tooth being made up of protuberance and recess, described heating film upper strata, and be located at battery module lower floor it Between position be covered with one layer of PI material, in described PI material and battery module between the negative pole of battery core irrigate one layer of heat conductive silica gel.

2. according to claim 1 have concurrently heating with the battery bag of heat sinking function it is characterised in that：Described radiation tooth cut Face is in the structure being arranged side by side by multiple rectangles.

3. according to claim 1 have concurrently heating with the battery bag of heat sinking function it is characterised in that：Described radiation tooth cut Face undulate.

4. according to claim 1 have concurrently heating with the battery bag of heat sinking function it is characterised in that：Described PI material thickness For 0.01 ~ 0.04mm.

5. according to claim 4 have concurrently heating with the battery bag of heat sinking function it is characterised in that：Described heat conductive silica gel Thickness is 3 ~ 7mm.

6. according to claim 1 have concurrently heating with the battery bag of heat sinking function it is characterised in that：Described heating film is two Layer polyimide material parcel heater redness Teflon line structure.

7. according to claim 1 have concurrently heating with the battery bag of heat sinking function it is characterised in that：Described battery module it Between be provided with interval reinforcement.