CN218160565U

CN218160565U - Electricity core heat abstractor

Info

Publication number: CN218160565U
Application number: CN202221561767.8U
Authority: CN
Inventors: 于坤
Original assignee: Xiaomi Automobile Technology Co Ltd
Current assignee: Xiaomi Automobile Technology Co Ltd
Priority date: 2022-06-21
Filing date: 2022-06-21
Publication date: 2022-12-27
Anticipated expiration: 2032-06-21

Abstract

The utility model discloses an electric core heat abstractor, electric core heat abstractor include insulating heat transfer spare and heat storage spare, and electric core includes utmost point ear and shell, and the first end of insulating heat transfer spare links to each other with utmost point ear, and the second end of insulating heat transfer spare links to each other with shell or cold plate, and the heat storage spare is made by phase change material, and heat storage spare links to each other with insulating heat transfer spare. The utility model provides an electricity core heat abstractor has simple structure, utmost point ear temperature rise speed is slow, and then electric core fills the advantage that the time is short, the security is high soon.

Description

Electricity core heat abstractor

Technical Field

The utility model relates to a power battery technical field, concretely relates to electricity core heat abstractor.

Background

The current industry tends to develop 4C fast charging for relieving charging anxiety of electric vehicles. But because utmost point ear heat production is great, and the heat dissipation is poor during natural cooling, and the temperature is too high easily, and then leads to fast the time extension of filling and the ageing aggravation of electric core, and the security is low. Although the pole ear can also be actively cooled by the cooler, there are disadvantages of complex system, high cost and poor safety.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving one of the technical problems in the related art at least to a certain extent.

Therefore, the embodiment of the utility model provides an electric core heat abstractor is proposed, this electric core heat abstractor has simple structure, utmost point ear temperature rise speed is slow, and then electric core fills the advantage that the time is short, the security is high soon.

The battery core heat dissipation device comprises an insulation heat transfer element and a heat storage element, wherein the battery core comprises a lug and a shell, the first end of the insulation heat transfer element is connected with the lug, and the second end of the insulation heat transfer element is connected with the shell or a cold plate; the heat storage part is made of phase-change materials and is connected with the insulating heat transfer part.

According to the utility model discloses electric core heat abstractor, electric core when filling fast, and then the heat that produces takes place the heat exchange through insulating heat transfer piece and heat-retaining piece, and heat-retaining piece changes through phase change material's physical properties and absorbs a large amount of latent heats and the temperature rise is slow, can effectively alleviate utmost point ear temperature rise speed from this, and electric core heat abstractor's mechanism is simple, and can reduce electric core and fill the time soon, and the life of electric core is longer, the security is higher. Moreover, the insulating property of the insulating heat transfer element avoids the short circuit of the battery cell caused by the electric connection of the lug and the shell or the cold plate, thereby further ensuring the use safety of the battery cell.

In some embodiments, the insulating heat transfer element comprises a heat transfer film, the heat transfer film forms a sealed cavity separated from the outside, and the heat storage element is positioned in the sealed cavity and is in contact with the heat transfer film in a fitting mode.

In some embodiments, the heat transfer film is a PET film or a PI film.

In some embodiments, the heat storage member is a phase change sheet made of a solid-to-solid phase change material or a solid-to-liquid phase change material.

In some embodiments, the casing is an aluminum casing, the tab is located in the casing and connects the pole and the pole core of the battery cell, and the insulating heat transfer element and the heat storage element are located in the casing and connect the tab and the casing.

In some embodiments, the insulating heat transfer member is bonded with the tab and the casing;

or the insulating heat transfer element is clamped between the tab and the inner wall surface of the shell.

In some embodiments, the tab is in a sheet shape, two side surfaces of the tab are spaced apart from the casing, and the insulating heat transfer member is in abutting contact with at least one side surface of the tab.

In some embodiments, an annular cavity is formed between the tab and the housing, and the outer contour of the insulating heat transfer element is matched with the annular cavity, and the insulating heat transfer element is matched in the annular cavity.

In some embodiments, the outer shell is a soft shell, at least a portion of the tab is located outside the soft shell, and the insulating heat transfer member connects the tab and the cold plate.

In some embodiments, the insulating heat transfer member is bonded to the tab and the cold plate.

Drawings

Fig. 1 is a schematic diagram of a battery cell according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a battery cell at a tab according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of a battery cell heat dissipation device according to an embodiment of the present invention.

Reference numerals:

1. a battery core heat dissipation device; 11. an insulating heat transfer member; 12. a heat storage member; 2. a tab; 3. a housing; 4. a pole piece; 5. and (4) pole column.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The following describes, with reference to fig. 1 to fig. 3, a battery cell heat dissipation device 1 according to an embodiment of the present invention.

According to the utility model discloses electric core heat abstractor 1 includes insulating heat transfer member 11 and heat-retaining member 12. The electric core includes utmost point ear 2 and shell 3, and the first end of insulating heat transfer member 11 links to each other with utmost point ear 2, and the second end of insulating heat transfer member 11 links to each other with shell 3 or cold drawing. The heat storage member 12 is made of a phase change material, and the heat storage member 12 is connected to the insulating heat transfer member 11. Wherein the insulating heat transfer member 11 is made of a material that is insulating and capable of conducting heat.

According to the utility model discloses electric core heat abstractor 1, when electric core fills soon, the heat that utmost point ear 2 produced takes place the heat exchange through insulating heat transfer piece 11 and heat-retaining piece 12, heat-retaining piece 12 absorbs a large amount of latent heats through phase change material's physical property change, heat-retaining piece 12 transmits latent heat to shell 3 or cold plate through insulating heat transfer piece 11 simultaneously, heat-retaining piece 12 temperature rise is slow from this, and then effectively alleviate utmost point ear 2 temperature rise speed, electric core heat abstractor 1's simple structure, and can reduce electric core fast charge time, the life of electric core is longer, the security is higher. Moreover, the insulation characteristic of the insulation heat transfer element 11 avoids the short circuit of the battery cell caused by the electric connection of the tab 2 and the shell 3 or the cold plate, thereby further ensuring the use safety of the battery cell.

Illustratively, when the battery cell is rapidly charged at a low temperature, the heat storage part 12 can absorb a large amount of latent heat, and after charging is completed, the heat dissipation of the heat storage part 12 is slow, and the temperature is slowly reduced, so that the tab 2 can be maintained within a set temperature range for a long time by absorbing the heat of the heat storage part 12, and the influence on the battery cell efficiency caused by the excessively fast temperature reduction of the tab 2 is avoided.

In some embodiments, as shown in fig. 3, the insulating heat transfer member 11 includes a heat transfer film forming a sealed chamber separated from the outside, and the heat storage member 12 is located in the sealed chamber and in abutting contact with the heat transfer film.

Therefore, the influence on the heat exchange between the lug 2 and the shell 3/cold plate when the physical property of the heat storage part 12 is changed (for example, the heat storage part absorbs heat and becomes liquid) is effectively avoided, and the short circuit of the battery cell caused by the contact between the lug 2 and the shell 3/cold plate of the heat storage part 12 is also avoided. Meanwhile, the shape of the heat transfer film can be changed, so that the heat storage piece 12 is effectively ensured to be attached and contacted with the lug 2 through the heat transfer film, and the heat exchange efficiency between the heat storage piece and the lug is further ensured. Moreover, on the basis of limited space, the volume of the heat storage part 12 is larger, latent heat which can be absorbed by the heat storage part 12 is more, and therefore the temperature rise rate of the tab 2 is relieved better.

In some embodiments, the heat transfer film is a PET (Polyethylene terephthalate) film or a PI (polyimide) film.

The PET film is also a high-temperature-resistant polyester film, and the PET film and the PI film have high-temperature resistance, low-temperature resistance and insulating property, so that the sealing of the phase-change material is ensured, and meanwhile, the environment with severe temperature change of the battery cell can be adapted, and the service life of the battery cell heat dissipation device 1 is long.

Specifically, the heat storage member 12 is a phase change sheet made of a solid-solid phase change material or a solid-liquid phase change material. Therefore, the solid sheet structure at normal temperature has stable shape, and the tab 2 is convenient to be attached and contacted with the shell 3/cold plate through a heat transfer film.

In some embodiments, as shown in fig. 1 and 2, the housing 3 is an aluminum housing, the tab 2 is located in the housing 3 and connects the pole 5 and the pole core 4 of the battery cell, and the insulating heat transfer element 11 and the heat storage element 12 are located in the housing 3 and connect the tab 2 and the housing 3.

The heat storage piece 12 is connected with the shell 3 through the insulating heat transfer piece 11 to realize heat exchange between the heat storage piece and the shell, and then the heat storage piece 12 absorbs the heat of the tab 2 and transfers the heat of the heat storage piece to the shell 3 at the same time so as to further slow down the temperature rise speed of the heat storage piece and the tab 2, and further guarantee the quick charging efficiency and the service life of the battery cell.

In some embodiments, the insulating heat transfer member 11 is bonded with the tab 2 and the case 3. Specifically, the insulating heat transfer member 11 can be bonded with the tab 2 and the housing 3 through an adhesive or a double-sided adhesive, and the close attachment of the insulating heat transfer member 11 with the tab 2 and the housing 3 is effectively ensured in a bonding manner, so as to further ensure the heat exchange efficiency.

Alternatively, the insulating heat transfer member 11 is interposed between the tab 2 and the inner wall surface of the case 3.

Namely, the insulating heat transfer member 11 is interference-fitted between the tab 2 and the inner wall surface of the case 3 by its own ductility, whereby the close contact of the insulating heat transfer member 11 with the tab 2 and the case 3 can be ensured as well.

In some embodiments, the tab 2 is in a sheet shape, both side surfaces of the tab 2 are spaced apart from the case 3, and the insulating heat transfer member 11 is in abutting contact with at least one side surface of the tab 2.

Therefore, the connection between the tab 2 and the insulating heat transfer element 11 is stable and convenient, the contact area between the tab 2 and the insulating heat transfer element 11 is large, and the heat exchange efficiency between the heat storage element 12 and the tab 2 is high.

Specifically, as shown in fig. 2, two sides of each tab 2 are provided with a cell heat dissipation device 1, that is, two sides of each tab 2 are in contact with an insulating heat transfer element 11.

Or, an annular cavity is formed between the lug 2 and the housing 3, the outline of the insulating heat transfer element 11 is matched with the annular cavity, and the insulating heat transfer element 11 is matched in the annular cavity.

Whereby the outer surface of the tab 2 is substantially in close contact with the insulating heat transfer member 11, whereby the contact area between the tab 2 and the insulating heat transfer member 11 is larger and the heat exchange efficiency therebetween is higher.

In some embodiments, the housing 3 is a soft shell, at least a portion of the tab 2 is located outside the soft shell, and the insulating heat transfer element 11 connects the tab 2 and the cold plate.

The heat storage piece 12 absorbs the heat of the tab 2 and simultaneously transfers the heat to the cold plate, so that the temperature rise speed can be reduced, the temperature rise speed of the tab 2 is reduced, and the quick charging efficiency and the service life of the battery cell are ensured.

In some embodiments, the insulating heat transfer member 11 is bonded to the tab 2 and the cold plate.

Therefore, the connection between the lug 2 and the cold plate is simple, and the heat exchange between the lug 2 and the heat storage part 12 and between the heat storage part 12 and the cold plate is stable and high in efficiency.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations to the above embodiments by those of ordinary skill in the art are intended to be within the scope of the present invention.

Claims

1. The utility model provides a battery core heat abstractor which characterized in that includes:

the battery cell comprises a lug and a shell, the first end of the insulating heat transfer element is connected with the lug, and the second end of the insulating heat transfer element is connected with the shell or the cold plate; and

the heat storage piece is made of a phase-change material and is connected with the insulating heat transfer piece.

2. The battery cell heat dissipation device according to claim 1, wherein the insulating heat transfer element comprises a heat transfer film, the heat transfer film forms a sealed cavity separated from the outside, and the heat storage element is located in the sealed cavity and in contact with the heat transfer film.

3. The cell heat dissipation device of claim 2, wherein the heat transfer film is a PET film or a PI film.

4. The battery cell heat dissipation device of claim 2, wherein the heat storage member is a phase change sheet made of a solid-to-solid phase change material or a solid-to-liquid phase change material.

5. The electric core heat dissipation device of any of claims 2 to 4, wherein the casing is an aluminum casing, the tab is located in the casing and connected to the pole of the electric core and the pole core, and the insulating heat transfer element and the heat storage element are located in the casing and connected to the tab and the casing.

6. The cell heat sink of claim 5,

the insulating heat transfer element is bonded with the pole lug and the shell;

7. The electrical core heat dissipation device of claim 5, wherein the tab is sheet-shaped, two side surfaces of the tab are spaced apart from the casing, and the insulating heat transfer element is in contact with at least one side surface of the tab.

8. The electric core heat dissipation device according to claim 7, wherein an annular cavity is formed between the tab and the casing, an outer profile of the insulating heat transfer element matches the annular cavity, and the insulating heat transfer element fits in the annular cavity.

9. The cell heat sink according to claim 2, wherein the casing is a soft casing, at least a portion of the tab is located outside the soft casing, and the insulating heat transfer element connects the tab and the cold plate.

10. The cell heat sink according to claim 9, wherein the insulating heat transfer member is bonded to the tab and the cold plate.