Battery box and battery pack

Abstract

The utility model relates to battery technology field, specifically disclose battery box and battery package, this battery box includes shell main body and cold plate, shell main body is provided with containing cavity, containing cavity is configured as containing battery pack, the bottom plate of shell main body supports battery pack, the cold plate includes lower plate and cover plate, and the lower plate and cover plate are surrounded and set into cooling runner, and the cold plate sets up in shell main body outside and is pasted with bottom plate, and the cold plate is detachably connected with shell main body. When the bottom of battery package knocks or wears, further causes the cold plate damage, needs to replace or maintain the cold plate, the maintenance personnel directly from the outside of shell main body can take off the cold plate from shell main body, further improves the maintainability of battery package, and the maintenance cost of user is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to battery housings and battery packs. Background Technology

[0002] With the rapid development of electric vehicles, more and more consumers are choosing to buy electric vehicles as their means of transportation. As the core component of electric vehicles, the battery pack is also the most expensive component in the entire electric vehicle. Its maintainability has become a key concern for consumers when purchasing electric vehicles.

[0003] In existing technologies, battery packs typically include a casing, a battery pack, and a cold plate. The casing has a receiving cavity, the cold plate is located within the battery cavity and on the bottom plate of the casing, and the battery pack is mounted on the cold plate. The battery pack and the cold plate are connected by thermally conductive structural adhesive. When the battery pack is scratched or bumped, causing damage or breakage to the cold plate, disassembly is difficult, making timely repair and replacement impossible, resulting in poor maintainability (after the battery pack design is completed, the battery pack needs to undergo mechanical condition testing to evaluate its maintainability), increasing the user's maintenance costs.

[0004] Therefore, it is urgent to improve the battery casing to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a battery box and battery pack to solve the problem of poor maintainability of the battery pack when the cold plate is set inside the main body of the shell in the related technology.

[0006] This utility model provides a battery housing, which includes:

[0007] The shell body has a receiving cavity configured to receive a battery pack, and the bottom plate of the shell body is used to support the battery pack.

[0008] The cold plate includes a lower plate and a cover plate, with a cooling channel formed between the lower plate and the cover plate. The cold plate is disposed outside the shell body and is attached to the bottom plate. The cold plate is detachably connected to the shell body.

[0009] This utility model also provides a battery pack, including the battery housing in the above-described solution.

[0010] The beneficial effects of this utility model are as follows:

[0011] This utility model provides a battery box and a battery pack. The battery box includes a main body and a cold plate. The main body has a receiving cavity configured to accommodate the battery pack. The bottom plate of the main body supports the battery pack. The cold plate includes a lower plate and a cover plate, with a cooling channel formed between the lower plate and the cover plate. The cold plate is located outside the main body and is attached to the bottom plate. The cold plate is detachably connected to the main body. When the battery pack with this battery box is in use, the heat generated by the battery pack is transferred to the cold plate outside the main body through the bottom plate. Circulating cooling water flows through the cooling channel formed between the lower plate and the cover plate, thereby carrying away the heat transferred to the cold plate.

[0012] When the battery pack is designed and undergoes mechanical performance testing, or when the battery pack is installed in a vehicle and its bottom is bumped or scratched, resulting in damage to the cold plate, and the cold plate needs to be replaced or repaired, the maintenance personnel can directly remove the cold plate from the main body of the casing from the outside, thereby improving the maintainability of the battery pack and reducing the user's maintenance costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the battery pack structure in an embodiment of the present invention. Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the battery pack structure in an embodiment of the present invention. Figure 2 ;

[0015] Figure 3 for Figure 2 Sectional view at point AA;

[0016] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0017] Figure 5 This is a schematic diagram of the battery pack explosion in an embodiment of the present invention. Figure 1 ;

[0018] Figure 6 This is a schematic diagram of the battery pack explosion in an embodiment of the present invention. Figure 2 .

[0019] In the picture:

[0020] 100. Battery pack;

[0021] 1. Shell body; 11. Receiving cavity; 12. Base plate; 13. Frame; 14. Connecting lug;

[0022] 2. Cold plate; 21. Bottom plate; 22. Cover plate; 23. Thermally conductive structural layer;

[0023] 3. Protective layer; 4. Filler layer. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] like Figures 1-6As shown, this embodiment provides a battery housing and a battery pack. The battery housing includes a main body 1 and a cold plate 2. The main body 1 has a receiving cavity 11 configured to receive a battery pack 100. The bottom plate 12 of the main body 1 supports the battery pack 100. The cold plate 2 includes a lower plate 21 and a cover plate 22. A cooling channel is formed between the lower plate 21 and the cover plate 22. The cold plate 2 is disposed outside the main body 1 and is attached to the bottom plate 12. The cold plate 2 is detachably connected to the main body 1. When the battery pack with this battery housing is in use, the heat generated by the battery pack 100 is transferred to the cold plate 2 outside the main body 1 through the bottom plate 12. Circulating cooling water is introduced into the cooling channel formed between the lower plate 21 and the cover plate 22 to remove the heat transferred to the cold plate 2.

[0029] When the battery pack is designed and mechanical performance is tested, or when the battery pack is installed in a vehicle and the bottom of the battery pack is bumped or scratched and worn, resulting in damage to the cold plate 2 and requiring replacement or repair, the maintenance personnel can directly remove the cold plate 2 from the outer shell 1, thereby improving the maintainability of the battery pack and reducing the user's maintenance costs.

[0030] Both the cover plate 22 and the base plate 12 of the cold plate 2 have pits and depressions on their surfaces. If the cover plate 22 and the base plate 12 are directly assembled, there will be a large number of gaps between them, which is not conducive to heat conduction. Optionally, the cold plate 2 also includes a heat-conducting structural layer 23, which is disposed between the cover plate 22 and the base plate 12. In this embodiment, the heat-conducting structural layer 23 can fill the microscopic uneven gaps on the contact surface between the cover plate 22 and the base plate 12, replacing the air with poor thermal conductivity in the gaps, thereby significantly improving the heat conduction efficiency.

[0031] Optionally, a cooling groove is recessed on the side of the lower plate 21 opposite to the cover plate 22, and the lower plate 21 and the cover plate 22 are fitted together so that the lower plate 21 and the cover plate 22 enclose the cooling groove to form a cooling channel; in other embodiments, a cooling groove is recessed on the side of the cover plate 22 opposite to the lower plate 21, and the lower plate 21 and the cover plate 22 are fitted together so that the lower plate 21 and the cover plate 22 enclose the cooling groove to form a cooling channel; in other embodiments, a first cooling groove and a second cooling groove are respectively recessed on the cover plate 22 and the lower plate 21, and the lower plate 21 and the cover plate 22 are fitted together so that the lower plate 21 and the cover plate 22 enclose the first cooling groove and the second cooling groove to form a cooling channel.

[0032] Optionally, the cover plate 22 and the lower plate 21 are fixed together by adhesive bonding, and the adhesive used to fix the cover plate 22 and the lower plate 21 is a high-temperature resistant and waterproof adhesive. In other embodiments, the cover plate 22 and the lower plate 21 may also be integrally molded parts to ensure the sealing of the cooling channel.

[0033] Optionally, the thermally conductive structural layer 23 can be one of thermally conductive structural adhesive, thermally conductive pad, thermally conductive silicone grease, and thermally conductive gel.

[0034] Optionally, the thermally conductive structural layer 23 is a thermally conductive structural adhesive with a bonding strength of 2–10 MPa. In this embodiment, this arrangement ensures a certain degree of adhesion between the cover plate 22 and the base plate 12 via the thermally conductive structural layer 23. However, this adhesion, while ensuring the cold plate 2 adheres to the base plate 12, also needs to ensure that workers can easily remove the cold plate 2 from the base plate 12 without damaging it (neither the cold plate 2 nor the base plate 12 will undergo deformation that damages its own structure). For example, the bonding strength of the thermally conductive structural adhesive can be 4 MPa, 6 MPa, or 8 MPa.

[0035] Optionally, the battery housing also includes a protective layer 3, which is disposed on the side of the cold plate 2 away from the main body 1. In this embodiment, the protective layer 3 completely covers the cold plate 2. When the vehicle equipped with this battery pack experiences a battery pack scratch, the protective layer 3 can protect the cold plate 2, thereby reducing the probability of the cold plate 2 being scratched and damaged.

[0036] Optionally, the protective layer 3 has a Mohs hardness greater than 3.0. In this embodiment, when the protective layer 3 is subjected to impact or scratch, this design can effectively prevent the protective layer 3 from undergoing large deformation, thereby effectively reducing the pressure on the cold plate 2. For example, the protective layer 3 is an aluminum-magnesium alloy component.

[0037] Optionally, a filling cavity is formed between the protective layer 3 and the cold plate 2; the battery housing also includes a filling layer 4, which fills the filling cavity and is elastic. In this embodiment, the filling cavity formed between the protective layer 3 and the cold plate 2 effectively provides space for the deformation of the protective layer 3, thereby preventing the deformation of the protective layer 3 from being directly transmitted to the cold plate 2. At the same time, the filling layer 4, which is elastic, fills the filling cavity and can both support the protective layer 3 and act as a buffer.

[0038] Optionally, a reinforcing rib can be provided on the side of the protective layer 3 opposite to the cold plate 2. The reinforcing rib can further enhance the strength of the protective layer 3 and prevent the protective layer 3 from deforming.

[0039] Optionally, the protective layer 3 is provided with a drainage hole that connects to the filling cavity. When rainwater enters the filling cavity, the drainage hole can drain the rainwater from the filling cavity, thereby ensuring the dryness of the filling cavity and preventing the protective layer 3 or the cold plate 2 from rusting.

[0040] Optionally, the filler layer 4 can be rubber, foam, or plastic.

[0041] Optionally, the filling layer 4 is a honeycomb structure. In this embodiment, the hexagonal units of the honeycomb structure can uniformly distribute the load, and its specific strength (strength to weight ratio) is much higher than that of solid materials; the honeycomb structure absorbs energy by collapsing layer by layer when under pressure, and can serve as an excellent cushioning material.

[0042] Optionally, the filler layer 4 is bonded to both the protective layer 3 and the cold plate 2. In this embodiment, the overall integrity of the battery box can be improved, and noise generation can be reduced.

[0043] Optionally, the protective layer 3 and the cold plate 2 are integrally formed. Specifically, the protective layer 3 and the cold plate 2 are manufactured using a casting process. The integrally formed part has higher structural strength and eliminates the assembly process.

[0044] In existing technologies, the cold plate 2 and the shell body 1 are typically fixed by directly connecting them to the frame 13 of the shell body 1 using bolts or rivets. This requires holes in the frame 13, which may affect the sealing of the cavity 11. To avoid this problem, the shell body 1 may optionally include a frame 13, a base plate 12, and connecting ears 14. The frame 13 and the base plate 12 form the cavity 11. The connecting ears 14 are welded or glued to the frame 13 and are detachably connected to the cold plate 2. In this embodiment, the connecting ears 14 are directly welded or glued to the frame 13, thus avoiding holes in the frame 13 and improving the sealing of the cavity 11. The connecting ears 14 are fixed to the cold plate 2 by screws or rivets. When the cold plate 2 needs repair or replacement, the broken / damaged cold plate can be replaced with a healthy one by cutting the pop rivets or loosening the bolts, achieving rapid repair (replacement).

[0045] Optionally, the frame 13 and the base plate 12 are integrally molded parts. In this embodiment, this arrangement can improve the sealing performance of the receiving cavity 11 and increase the production efficiency of the shell body 1.

[0046] Optionally, the shell body 1 is obtained by stamping or casting. In this embodiment, the shell body 1 is made of aluminum, which has the advantages of high plasticity and light weight. In other embodiments, aluminum alloy is also used, which has the advantages of high strength and low cost. Cast iron, stainless steel, and other materials with greater cost advantages can also be used. In other embodiments, the frame 13 and the base plate 12 can be fixed by screwing or welding.

[0047] This embodiment also provides a battery pack, including a battery assembly 100 and the battery housing described above. The battery assembly 100 is disposed within the receiving cavity 11, and a base plate 12 supports the battery assembly 100. In this embodiment, the battery assembly 100 and the base plate 12 are bonded and fixed together with thermally conductive adhesive. Optionally, the adhesive strength of the thermally conductive structural adhesive is greater than the adhesive strength of the thermally conductive structural layer 23 when using thermally conductive structural adhesive.

[0048] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery housing, characterized in that, include: The shell body (1) is provided with a receiving cavity (11) configured to receive a battery pack (100), and the bottom plate (12) of the shell body (1) is used to support the battery pack (100); The cold plate (2) includes a lower plate (21) and a cover plate (22). A cooling channel is formed between the lower plate (21) and the cover plate (22). The cold plate (2) is disposed outside the shell body (1) and is attached to the bottom plate (12). The cold plate (2) is detachably connected to the shell body (1).

2. The battery housing according to claim 1, characterized in that, The cold plate (2) also includes a heat-conducting structural layer (23), which is disposed between the cover plate (22) and the bottom plate (12).

3. The battery housing according to claim 2, characterized in that, The thermally conductive structural layer (23) is a thermally conductive structural adhesive, and the adhesive strength of the thermally conductive structural adhesive is 2 to 10 MPa.

4. The battery housing according to claim 1, characterized in that, The battery housing also includes a protective layer (3), which is disposed on the side of the cold plate (2) away from the main body (1).

5. The battery housing according to claim 4, characterized in that, The protective layer (3) and the cold plate (2) are integrally formed parts.

6. The battery housing according to claim 4, characterized in that, A filling cavity is formed between the protective layer (3) and the cold plate (2); The battery housing also includes a filling layer (4), which is disposed in the filling cavity and has elasticity.

7. The battery housing according to claim 6, characterized in that, The filling layer (4) has a honeycomb structure.

8. The battery housing according to claim 6, characterized in that, The filler layer (4) is bonded to the protective layer (3) and the cold plate (2) respectively.

9. The battery housing according to claim 1, characterized in that, The shell body (1) also includes a frame (13) and a connecting ear (14). The frame (13) and the bottom plate (12) surround the receiving cavity (11). The connecting ear (14) is welded or glued to the frame (13), and the connecting ear (14) is detachably connected to the cold plate (2).

10. The battery housing according to claim 9, characterized in that, The frame (13) and the base plate (12) are integrally formed parts.

11. A battery pack, characterized in that, The battery pack (100) includes a battery housing according to any one of claims 1-10, wherein the battery pack (100) is disposed in the receiving cavity (11) and the base plate (12) supports the battery pack (100).

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