Battery box and battery pack

Abstract

The utility model provides a battery box and a battery pack. The battery box comprises: a housing for accommodating a battery cell; the heat reflection structure layer is arranged between the shell and the battery cell and used for reflecting heat radiation in the shell, the heat reflection structure layer comprises a first reflection sheet, a grating supporting piece and a second reflection sheet, and the grating supporting piece is located between the first reflection sheet and the second reflection sheet and forms an air separation cavity. The battery pack solves the problem that in the prior art, the heat preservation effect of the battery pack is poor.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and in particular to a battery box and a battery pack. Background Art

[0002] When the battery is in a low temperature environment for a long time, lithium deposition will occur, which will reduce the battery life. Therefore, the battery pack working in a cold environment must be designed to be thermally insulated. At present, there are two types of thermal insulation methods for battery packs: active thermal insulation and passive thermal insulation. Active thermal insulation is to add an electric heating module to heat the battery, while passive thermal insulation is to reasonably adjust the structure or material of the battery pack to increase the thermal insulation effect. Among them, the existing passive thermal insulation method of the battery pack is mainly to directly apply an insulation layer on the inner surface of the shell or directly use thermal insulation materials to wrap the battery cell. However, the above existing methods can only delay the temperature drop of the battery pack to a certain extent, and the thermal insulation effect is poor.

[0003] As can be seen from the above, the existing technology has the problem of poor thermal insulation effect of the battery pack. Utility Model Content

[0004] The main purpose of the utility model is to provide a battery box and a battery pack to solve the problem of poor thermal insulation effect of the battery pack in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery box is provided, including: a shell, the shell is used to accommodate battery cells; a heat reflection structure layer, the heat reflection structure layer is arranged between the shell and the battery cells, and is used to reflect the heat radiation in the shell, the heat reflection structure layer includes a first reflection sheet, a grille support and a second reflection sheet, the grille support is located between the first reflection sheet and the second reflection sheet to form an air cavity.

[0006] Furthermore, the shell comprises a box body and a top cover, the battery cell is accommodated in the box body, the top cover is arranged on the upper opening of the box body, and the heat reflection structure layer is arranged between the box body and the battery cell, and between the top cover and the battery cell (10).

[0007] Furthermore, the heat reflection structure layer includes a first heat reflection structure layer, and the first heat reflection structure layer is arranged on the inner side surface of the top cover close to the box body and is connected and fixed to the top cover.

[0008] Furthermore, the box body includes two end plates and two side plates arranged opposite to each other, the heat reflective structure layer also includes a second heat reflective structure layer and a third heat reflective structure layer, there are two second heat reflective structure layers and two third heat reflective structure layers, the two second heat reflective structure layers are respectively located between the two end plates and the battery cells, and the two third heat reflective structure layers are respectively arranged between the two side plates and the battery cells.

[0009] Furthermore, the grid support member is bonded to the first reflective sheet and the second reflective sheet.

[0010] Furthermore, the grid support is made of plastic material.

[0011] Furthermore, the first reflective sheet and / or the second reflective sheet is any one of aluminum foil, copper foil, silver foil, gold foil, ceramic and glass fiber.

[0012] Furthermore, the thickness of the grid support is greater than or equal to 3 mm.

[0013] Furthermore, the heat reflective structure layer is bonded or welded to the shell.

[0014] According to another aspect of the utility model, a battery pack is provided, comprising the above-mentioned battery box.

[0015] According to the technical solution of the utility model, the battery box includes a shell and a heat-reflecting structure layer, the shell is used to accommodate the battery cell, the heat-reflecting structure layer is arranged between the shell and the battery cell, and is used to reflect the heat radiation in the shell, the heat-reflecting structure layer includes a first reflective sheet, a grid support and a second reflective sheet, the grid support is located between the first reflective sheet and the second reflective sheet and forms an air compartment, so that by setting the heat-reflecting structure layer as a double-layer reflective structure, the reflective sheet can reflect the heat radiation in the shell to prevent heat loss, and the internal grid support can form an air compartment with the reflective sheet, so that no heat convection is generated inside the heat-reflecting structure layer, which greatly slows down the heat conduction rate, thereby greatly improving the heat preservation effect of the battery pack, and solving the problem of poor heat preservation effect of the battery pack in the prior art. In addition, by setting the grid support, the reflective sheet can be supported, thereby improving the structural strength of the heat-reflecting structure layer, ensuring that the shape of the reflective sheet is fixed, increasing the service life and being suitable for shells of different shapes. Furthermore, the heat-reflective structural layer can also provide a certain thermal insulation effect, thereby increasing the safety of the battery pack and, to a certain extent, reducing the harm to the external passenger compartment when the battery pack thermally runs away and catches fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 An exploded view of a battery pack in a specific embodiment of the utility model is shown;

[0018] Figure 2 A schematic diagram showing the arrangement of a heat reflective structural layer in a specific embodiment of the utility model is shown;

[0019] Figure 3 A cross-sectional view of a battery pack in a specific embodiment of the present utility model is shown;

[0020] Figure 4 A partial enlarged cross-sectional view of a third heat reflective structure layer in a specific embodiment of the utility model is shown;

[0021] Figure 5 A schematic structural diagram of a third heat reflective structural layer in a specific embodiment of the utility model is shown;

[0022] Figure 6 An enlarged schematic diagram of a third heat reflective structure layer in a specific embodiment of the utility model is shown;

[0023] Figure 7 A schematic structural diagram of a first heat reflective structural layer in a specific embodiment of the utility model is shown;

[0024] Figure 8 An enlarged view of the first heat reflective structure layer in a specific embodiment of the utility model is shown.

[0025] The above drawings include the following reference numerals:

[0026] 10. Battery cell; 20. Shell; 21. Box; 211. End plate; 212. Side plate; 22. Top cover; 30. First reflective sheet; 40. Grid support; 50. Second reflective sheet; 60. First heat reflective structure layer; 70. Second heat reflective structure layer; 80. Third heat reflective structure layer. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0029] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0030] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0031] In order to solve the problem of poor thermal insulation effect of the battery pack in the prior art, the utility model provides a battery box and a battery pack.

[0032] like Figures 1 to 8 As shown, the battery box includes a battery cell 10, a shell 20 and a heat reflective structure layer. The shell 20 is used to accommodate the battery cell 10. The heat reflective structure layer is arranged between the shell 20 and the battery cell 10, and is used to reflect the heat radiation in the shell 20. The heat reflective structure layer includes a first reflective sheet 30, a grid support 40 and a second reflective sheet 50, and the grid support 40 is located between the first reflective sheet 30 and the second reflective sheet 50 to form an air compartment.

[0033] By setting the heat reflection structure layer as a double-layer reflection structure, the reflection sheet can reflect the heat radiation in the shell 20 to prevent heat loss, and the internal grid support 40 can form an air compartment with the reflection sheet, so that no heat convection is generated inside the heat reflection structure layer, which greatly slows down the heat conduction rate, thereby greatly improving the insulation effect of the battery pack. In addition, by setting the grid support 40, it can support the reflection sheet, thereby improving the structural strength of the heat reflection structure layer, ensuring the shape of the reflection sheet, increasing the service life and being suitable for shells 20 of different shapes. Furthermore, the heat reflection structure layer can also play a certain insulation effect, thereby increasing the safety of the battery pack and reducing the harm to the external passenger compartment when the battery pack thermal runaway fire occurs to a certain extent.

[0034] It is understandable that the main heat source of the battery pack is the battery cell 10, so the heat reflection structure layer is mainly used to reflect the heat radiation of the battery cell 10. Specifically, Figure 4 The arrow in the figure indicates the direction of heat radiation of the battery cell 10. Of course, other electrical components of the battery pack are also arranged in the housing 20, which will also generate a certain amount of heat, and the heat reflection structure layer will also reflect the heat radiation of this part.

[0035] like Figure 1 As shown, the housing 20 includes a box body 21 and a top cover 22. The box body 21 has a receiving groove and a top opening connected to the receiving groove, the battery cell 10 is received in the receiving groove of the box body 21, and the top cover 22 is provided to cover the upper opening of the box body 21. The heat reflective structure layer is provided between the box body 21 and the battery cell 10, and between the top cover 22 and the battery cell 10.

[0036] like Figures 1 to 4As shown, the heat reflection structure layer includes a first heat reflection structure layer 60, a second heat reflection structure layer 70 and a third heat reflection structure layer 80. The first heat reflection structure layer 60 is arranged on the inner side of the top cover 22 close to the box body 21, and is connected and fixed to the top cover 22. There are two second heat reflection structure layers 70 and two third heat reflection structure layers 80, and the box body 21 includes two end plates 211 and two side plates 212 arranged opposite to each other. The two second heat reflection structure layers 70 are respectively located between the two end plates 211 and the battery cell 10. The two third heat reflection structure layers 80 are respectively arranged between the two side plates 212 and the battery cell 10.

[0037] In this embodiment, the side plate 212 is a straight plate structure, and the third heat reflective structure layer 80 is disposed on the inner side of the side plate 212. However, the end plate 211 is not necessarily a straight plate structure, so the second heat reflective structure layer 70 is connected to at least a portion of the inner side of the end plate 211.

[0038] Specifically, there are multiple battery cells 10, and the multiple battery cells 10 are arranged in sequence to form a battery cell group. Along the arrangement direction of the battery cells 10, the end plates 211 are located at both ends of the battery cell group, and the side plates 212 are located at both sides of the battery cell group.

[0039] Furthermore, the box body 21 further includes a bottom plate, and the battery pack further includes a liquid cooling plate, which is disposed on the bottom plate of the box body 21, or the liquid cooling plate and the bottom plate are integrated into one, for dissipating heat and cooling the battery cell 10. It is understandable that since the bottom of the box body 21 is provided with a liquid cooling plate, there is no need to provide a heat reflection structure layer.

[0040] In this embodiment, if Figures 7 and 8 As shown, the inner surface of the top cover 22 is a flat plate structure, and correspondingly, the first heat reflection structure layer 60 is also a flat plate structure, which is attached to the inner surface of the top cover 22 and connected and fixed to the inner surface of the top cover 22. Correspondingly, the second heat reflection structure layer 70 is also a flat plate structure, which is upright and attached to the inner side of the end plate 211.

[0041] In this embodiment, the inner side of the side plate 212 has a step, and the third heat reflective structure layer 80 is a matching Z-shaped. Specifically, the inner side of the side plate 212 has an inward step, and the middle part of the third heat reflective structure layer 80 is a bent section, which corresponds to the step and fits the step surface. Figure 4 Further, the first reflective sheet 30, the grid support 40 and the second reflective sheet 50 in the third heat reflective structure layer 80 are also Z-shaped structures, such as Figure 5 and Figure 6 shown.

[0042] In this embodiment, the heat reflection structure layer is bonded to the shell 20. Specifically, the side of the heat reflection structure layer close to the shell 20 is the first reflection sheet 30, and the heat reflection structure layer is bonded to the shell 20 through the first reflection sheet 30. The first reflection sheets 30 in the second heat reflection structure layer 70 and the third heat reflection structure layer 80 are respectively bonded to the inner side surface of the end plate 211 and at least a part of the inner side surface of the side plate 212, and the first reflection sheet 30 of the first heat reflection structure layer 60 is bonded to the side of the top cover 22 close to the receiving groove, that is, the lower side surface. Of course, the heat reflection structure layer and the shell 20 can also be welded, which can be selected according to actual needs.

[0043] Furthermore, if a crossbeam and a longitudinal beam are provided in the housing 20, and the installation cavity of the battery cell 10 is divided into multiple parts, the second heat reflection structure layer 70 and the third heat reflection structure layer 80 are correspondingly divided into multiple substructures to avoid the crossbeam and the longitudinal beam. In addition, the second heat reflection structure layer 70 and the third heat reflection structure layer 80 are also provided on the sides of the crossbeam and the longitudinal beam, respectively, to ensure that heat is not drawn out from the crossbeam and the longitudinal beam.

[0044] In this embodiment, the grid support member 40 is bonded to the first reflective sheet 30 and the second reflective sheet 50 .

[0045] In order to ensure the heat reflection capability of the heat reflection structure layer, the first reflection sheet 30 and / or the second reflection sheet 50 is a metal heat reflection material or a non-metal heat reflection material.

[0046] In this embodiment, the first reflective sheet 30 and / or the second reflective sheet 50 are metal heat reflective materials, specifically aluminum foil. Aluminum foil has good heat reflective ability, low density, low price, will not increase the overall weight of the battery pack too much, and will not increase too much manufacturing cost. Of course, the first reflective sheet 30 and / or the second reflective sheet 50 can also be other metal heat reflective materials, such as copper foil, silver foil or gold foil, or non-metal heat reflective materials such as ceramics or glass fiber, which can be selected according to actual needs.

[0047] In this embodiment, the grid support member 40 is made of plastic material. Specifically, the grid support member 40 is made of temperature-resistant plastic, such as PC.

[0048] In this embodiment, the grid support member 40 has a certain thickness. It can be understood that the thickness direction of the grid support member 40 is the direction from the first reflective sheet 30 to the second reflective sheet 50. Specifically, Figure 6 and Figure 8As shown, the grid support member 40 has a plurality of grids distributed in an array, and the openings on both sides of each grid are respectively attached to the first reflective sheet 30 and the second reflective sheet 50, so as to form an air cavity. In order to ensure that the air cavity has a sufficient effect of preventing heat convection, the air cavity needs to have a certain depth, that is, there needs to be a certain distance between the first reflective sheet 30 and the second reflective sheet 50.

[0049] In this embodiment, the thickness of the grid support member 40 is greater than or equal to 3 mm.

[0050] Furthermore, the grille of the grille support member 40 in this embodiment is a square grille. Of course, the grille of the grille support member 40 may also be other shapes such as diamond or triangle, which can be selected according to actual needs.

[0051] The present application also provides a battery pack, comprising the above-mentioned battery box.

[0052] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: by setting the heat reflection structure layer as a double-layer reflection structure, the reflection sheet can reflect the heat radiation in the shell 20 to prevent heat loss, and the internal grid support 40 can form an air compartment together with the reflection sheet, so that no heat convection is generated inside the heat reflection structure layer, which greatly slows down the heat conduction rate, thereby greatly improving the insulation effect of the battery pack. In addition, by setting the grid support 40, it can support the reflection sheet, thereby improving the structural strength of the heat reflection structure layer, ensuring the shape of the reflection sheet, increasing the service life and being suitable for shells 20 of different shapes. Furthermore, the heat reflection structure layer can also play a certain insulation effect, thereby increasing the safety of the battery pack and reducing the harm to the external passenger compartment when the battery pack thermal runaway fire occurs to a certain extent.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0055] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery box, characterized in that: include: A housing (20), the housing (20) being used to accommodate the battery cell (10); A heat reflective structural layer, the heat reflective structural layer is arranged between the shell (20) and the battery core (10) and is used to reflect heat radiation in the shell (20), the heat reflective structural layer comprises a first reflective sheet (30), a grid support member (40) and a second reflective sheet (50), the grid support member (40) is located between the first reflective sheet (30) and the second reflective sheet (50) and forms an air cavity.

2. The battery box according to claim 1, characterized in that: The housing (20) comprises a box body (21) and a top cover (22); the battery cell (10) is accommodated in the box body (21); the top cover (22) is arranged to cover an upper opening of the box body (21); and the heat reflection structure layer is arranged between the box body (21) and the battery cell (10), and between the top cover (22) and the battery cell (10).

3. The battery box according to claim 2, characterized in that: The heat reflection structure layer comprises a first heat reflection structure layer (60), wherein the first heat reflection structure layer (60) is arranged on the inner side surface of the top cover (22) close to the box body (21) and is connected and fixed to the top cover (22).

4. The battery box according to claim 2, characterized in that: The box body (21) comprises two end plates (211) and two side plates (212) arranged opposite to each other, and the heat reflective structural layer further comprises a second heat reflective structural layer (70) and a third heat reflective structural layer (80), and the second heat reflective structural layer (70) and the third heat reflective structural layer (80) are both two in number, and the two second heat reflective structural layers (70) are respectively located between the two end plates (211) and the battery core (10), and the two third heat reflective structural layers (80) are respectively located between the two side plates (212) and the battery core (10).

5. The battery box according to claim 2, characterized in that: The grid support member (40) is bonded to the first reflective sheet (30) and the second reflective sheet (50).

6. The battery box according to claim 1, characterized in that: The grid support member (40) is made of plastic material.

7. The battery box according to claim 1, characterized in that: The first reflective sheet (30) and / or the second reflective sheet (50) is any one of aluminum foil, copper foil, silver foil, gold foil, ceramic and glass fiber.

8. The battery box according to claim 1, characterized in that: The thickness of the grid support member (40) is greater than or equal to 3 mm.

9. The battery box according to claim 1, characterized in that: The heat reflection structural layer is bonded or welded to the shell (20).

10. A battery pack, characterized in that: A battery box comprising the battery box according to any one of claims 1 to 9.

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