Battery cell heat preservation box

Abstract

The utility model discloses a battery cell heat preservation box which comprises a box cover, a box bottom, a heating film, a cooling assembly and a plurality of thermistors, wherein the box cover and the box bottom are arranged on the two sides of a frame respectively; the heating film and the cooling assembly are arranged on the box bottom; the box cover, the frame and the box bottom define a storage space for storing battery cells, the heating film is used for increasing the temperature of the battery cells in the storage space, and the cooling assembly is used for reducing the temperature of the battery cells in the storage space. The battery cell temperature difference in the battery cell heat preservation box is reduced, so that the performance of the whole battery cell heat preservation box is not influenced.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery boxes, and particularly relates to a battery core insulation box. Background Art

[0002] A battery box is a device used to house battery cells and protect them when used outdoors. In colder regions or seasons, the battery system may not function properly due to the low ambient temperature. In warmer environments, the lack of heat dissipation can shorten the battery lifespan and even create the risk of explosion.

[0003] The utility model patent with application number CN202323565309.9 discloses a constant temperature battery box for electric cells, and provides a constant temperature battery box for electric cells that can adjust the internal temperature of the box according to the temperature inside the box. The box includes a box body and a heat treatment system, the lower part of the box body is fixedly connected to a bottom shell, the upper part of the box body is fixedly connected to a box cover, the bottom shell includes a bottom plate, a circuit board and a bottom cover, the bottom plate and the bottom cover are respectively arranged on both sides of the circuit board, the upper part of the bottom shell is fixedly connected to two sets of joints, the joints are connected to the circuit board, the heat treatment system includes a heating box, a refrigerator, a circulating pump and a PCT heater, one side of the heating box is connected to the joint through a water pipe, and the other side of the heating box is connected to the refrigerator through a water pipe. A circulating pump is installed on one side of the refrigerator, and the circulating pump is connected to the other joint through a water pipe. This solution is to arrange a heating box and a refrigerator on the water pipe to change the temperature of the liquid entering the battery box, so that the battery box maintains a constant temperature. However, when the temperature is increased, the middle battery cell and the edge battery cell will exchange heat with each other, and the edge battery cell will also exchange heat with the external environment, resulting in differences in the actual operating temperature of each battery cell. The temperature of the middle battery cell will be higher than that of the edge battery cell. After long-term use, the performance of each battery cell will differ, which will affect the performance of the entire battery box. Utility Model Content

[0004] The purpose of the utility model is to provide a battery core insulation box, which reduces the temperature difference of the battery cores in the battery core insulation box, thereby ensuring that the performance of the entire battery core insulation box is not affected.

[0005] The technical solution adopted by the present invention to solve its technical problems is to propose a battery cell insulation box, including a box cover and a box bottom respectively arranged on both sides of a frame, a heating film and a cooling component arranged on the box bottom, and a plurality of thermistors encapsulated on the heating film; the box cover, the frame and the box bottom form a storage space for storing battery cells, the heating film is used to increase the temperature of the battery cells in the storage space, and the cooling component is used to reduce the temperature of the battery cells in the storage space.

[0006] In an embodiment of the present application, the cooling component includes a water inlet and a water outlet provided on the bottom of the box, and a flow channel provided on the bottom of the box; one end of the flow channel is connected to the water inlet, and the other end is connected to the water outlet.

[0007] In an embodiment of the present application, the cooling component further includes a plurality of diverter plates arranged in parallel on the bottom of the box, and the flow channel is formed between two adjacent diverter plates.

[0008] In an embodiment of the present application, an arc-shaped transition zone is provided at the end of the diverter plate, and the cold water changes its flow direction after passing through the arc-shaped transition zone.

[0009] In an embodiment of the present application, the thermal insulation box further includes a heat-conducting structural adhesive, and the heat-conducting structural adhesive is arranged on a side of the heating film close to the box cover.

[0010] In an embodiment of the present application, the heating film includes a plurality of heating units arranged in a rectangular array, and the thermistor is packaged on the heating film unit.

[0011] In the embodiment of the present application, the thickness of the heating film is 0.5 mm.

[0012] In an embodiment of the present application, a heat preservation groove is provided under the bottom of the box, and a heat preservation layer is embedded in the heat preservation groove.

[0013] In an embodiment of the present application, the thermal insulation layer is a foam material.

[0014] In the embodiment of the present application, the thermistor is a negative temperature coefficient thermistor.

[0015] The beneficial effects of the utility model are:

[0016] 1. The battery cell insulation box proposed by this utility model has a thermistor that changes its resistance value according to the ambient temperature when the battery cell insulation box heats up, thereby changing the heating power of each part of the heating film. This makes the heating efficiency of the edge battery cells greater than that of the middle battery cells, thereby reducing the temperature difference of the battery cells in the battery cell insulation box, thereby ensuring that the performance of the entire battery cell insulation box is not affected.

[0017] 2. The battery cell insulation box proposed in this invention has a cooling assembly that further includes a plurality of manifolds arranged in parallel on the bottom of the box. A flow channel is formed between two adjacent manifolds. While the water inlet velocity remains constant, the manifolds are used to divert the cold water, thereby accelerating the flow of the cold water and improving the cooling effect of the rear flow channel on the battery cells.

[0018] 3. The battery cell insulation box proposed by the present invention arranges the heating film to be composed of a plurality of separate heating units, and encapsulates a thermistor on each heating unit, thereby providing more accurate heating power to the battery cells at various positions in the battery cell insulation box, so that the temperature at various locations in the battery cell insulation box tends to be consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all. Those skilled in the art can derive other drawings from these drawings without inventive effort.

[0020] Figure 1 This is a front view of a battery cell insulation box according to an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the bottom of a battery cell insulation box according to an embodiment of the present utility model;

[0022] Figure 3 This is a cross-sectional view of the bottom of a battery cell insulation box according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of a flow channel of a battery cell insulation box according to an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of a heating unit of a battery cell insulation box according to an embodiment of the present utility model.

[0025] In the figure: 1. Frame; 2. Box cover; 3. Box bottom; 4. Heating film; 41. Heating unit; 5. Cooling component; 51. Water inlet; 52. Water outlet; 53. Flow channel; 54. Diverter plate; 55. Arc-shaped transition zone; 6. Thermistor; 7. Storage space; 8. Thermal conductive structural adhesive; 9. Insulation tank; 10. Insulation layer. DETAILED DESCRIPTION

[0026] To more clearly illustrate the embodiments of the present invention and the technical solutions in the prior art, the following describes specific embodiments of the present invention with reference to the accompanying drawings. Obviously, the drawings described below are merely examples of the present invention. A person skilled in the art can, without inventive effort, derive other drawings and other embodiments from these drawings. Furthermore, design orientations only represent relative positional relationships between components, not absolute positional relationships.

[0027] The present invention provides a battery insulation box. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 , mainly includes a frame 1, a box cover 2 and a box bottom 3.

[0028] In an embodiment of the present application, a battery cell insulation box includes a frame 1, a box cover 2, and a box bottom 3. The box cover 2 and the box bottom 3 are respectively arranged on both sides of the frame 1. The box cover 2, the frame 1, and the box bottom 3 together enclose a storage space 7. The battery cells can be placed in the storage space 7. A heating film 4 and a cooling component 5 are provided on the box bottom 3. A plurality of thermistors 6 are encapsulated on the heating film 4. The heating film 4 is used to increase the temperature of the battery cells in the storage space 7 when the ambient temperature and the battery cell temperature are low. The cooling component 5 is used to reduce the temperature of the battery cells in the storage space 7 when the ambient temperature and the battery cell temperature are high. When the battery cell insulation box heats up, the thermistor 6 will change its resistance value according to the ambient temperature, thereby changing the heating power of each part of the heating film 4, so that the heating efficiency of the edge battery cells is greater than the heating efficiency of the middle battery cells, thereby reducing the temperature difference of the battery cells in the battery cell insulation box, thereby ensuring that the performance of the entire battery cell insulation box is not affected.

[0029] Specifically, the thermistor 6 can be a positive temperature coefficient thermistor or a negative temperature coefficient thermistor, and the thickness of the heating film 4 is 0.5 mm.

[0030] Preferably, the thermistor 6 is a negative temperature coefficient thermistor.

[0031] In one embodiment, the cooling component 5 includes a water inlet 51 and a water outlet 52 arranged on the bottom 3 of the box, and a flow channel 53 arranged on the bottom 3 of the box. One end of the flow channel 53 is connected to the water inlet 51, and the other end is connected to the water outlet 52. The water inlet 51 and the water outlet 52 are externally connected to the vehicle water cooling equipment. When the battery cell is overheated, the water cooling equipment injects cold water from the water inlet 51, and the cold water flows out from the water outlet 52 after passing through the flow channel 53, thereby reducing the temperature of the battery cell in the insulation box.

[0032] Furthermore, the cooling component 5 also includes a plurality of diverter plates 54 arranged in parallel on the bottom 3 of the box, and a flow channel 53 is formed between two adjacent diverter plates 54. When the water inlet speed of the water inlet 51 remains unchanged, the diverter plates 54 are used to divert the cold water, thereby accelerating the flow speed of the cold water and improving the cooling effect of the rear section flow channel 53 on the battery cell.

[0033] Preferably, an arc-shaped transition zone 55 is provided at the end of the diverter plate 54 , and the cold water changes its flow direction after passing through the arc-shaped transition zone 55 .

[0034] In one embodiment, the heating film 4 includes a plurality of heating units 41 arranged in a rectangular array on the bottom 3 of the box, and each heating unit 41 is encapsulated with a thermistor 6. The heating film 4 is arranged to be composed of a plurality of individual heating units 41, and each heating unit 41 is encapsulated with a thermistor 6, thereby providing more precise heating power to the battery cells at various positions in the battery cell insulation box, so that the temperature at each location in the battery cell insulation box tends to be consistent.

[0035] Furthermore, each thermistor 6 is packaged at the center of each heating unit 41 .

[0036] In one embodiment, the battery cell insulation box further includes a thermally conductive structural adhesive 8, which is arranged on the side of the heating film 4 close to the box cover 2. One side of the thermally conductive structural adhesive 8 is bonded to the heating film 4, and the other side is bonded to the battery cell.

[0037] In one embodiment, below the bottom 3 of the box (with Figure 1 For reference purposes, a heat preservation tank 9 is also provided, in which a heat preservation layer 10 is embedded. The heat preservation layer 10 is used to slow down the heat exchange efficiency between the heat preservation box and the external environment.

[0038] Furthermore, the thermal insulation layer 10 is made of a foam material, such as MPP, foamed silica gel, etc.

[0039] In one embodiment, a connection block is further provided on the box bottom 3, and the connection block is detachably connected to other devices, thereby fixing the entire battery cell insulation box.

[0040] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0041] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific embodiments of the present invention are not limited to these descriptions. For those skilled in the art of the present invention, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the scope of protection of the present invention.

Claims

1. A battery cell insulation box, characterized in that: The invention comprises a box cover (2) and a box bottom (3) respectively arranged on both sides of a frame (1), a heating film (4) and a cooling component (5) arranged on the box bottom (3), and a plurality of thermistors (6) encapsulated on the heating film (4); the box cover (2), the frame (1) and the box bottom (3) form a storage space (7) for storing battery cells; the heating film (4) is used to increase the temperature of the battery cells in the storage space (7); and the cooling component (5) is used to reduce the temperature of the battery cells in the storage space (7).

2. The battery cell insulation box according to claim 1, characterized in that: The cooling component (5) comprises a water inlet (51) and a water outlet (52) provided on the box bottom (3), and a flow channel (53) provided on the box bottom (3); one end of the flow channel (53) is in communication with the water inlet (51), and the other end is in communication with the water outlet (52).

3. The battery cell insulation box according to claim 2, characterized in that: The cooling assembly (5) further comprises a plurality of diverter plates (54) arranged in parallel on the box bottom (3), wherein the flow channel (53) is formed between two adjacent diverter plates (54).

4. The battery cell insulation box according to claim 3, characterized in that: An arc-shaped transition zone (55) is provided at the end of the diverter plate (54), and the cold water changes its flow direction after passing through the arc-shaped transition zone (55).

5. The battery cell insulation box according to claim 1, characterized in that: The heat-insulating box further comprises a heat-conducting structural adhesive (8), and the heat-conducting structural adhesive (8) is arranged on a side of the heating film (4) close to the box cover (2).

6. The battery cell insulation box according to claim 1, characterized in that: The heating film (4) comprises a plurality of heating units (41) arranged in a rectangular array, and the thermistor (6) is encapsulated on the heating film (4) units.

7. The battery cell insulation box according to claim 6, characterized in that: The heating film (4) has a thickness of 0.5 mm.

8. The battery cell insulation box according to claim 1, characterized in that: A heat preservation groove (9) is provided below the box bottom (3), and a heat preservation layer (10) is embedded in the heat preservation groove (9).

9. The battery core insulation box according to claim 8, characterized in that: The thermal insulation layer (10) is made of foaming material.

10. The battery cell insulation box according to claim 1, characterized in that: The thermistor (6) is a negative temperature coefficient thermistor.

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