Battery box, battery assembly and vehicle

Abstract

The embodiment of the utility model discloses a battery box, a battery assembly and a vehicle, the battery box comprises a box body assembly and a connecting assembly, the box body assembly comprises a shell and a first thermal insulation layer, the shell is provided with an opening, and the first thermal insulation layer is mounted on the inner wall of the shell; the connecting assembly comprises a connecting plate and a second heat preservation layer, the second heat preservation layer is installed on the inner side of the connecting plate, the connecting plate is connected with the shell and covers the opening so that a battery bin can be formed in a surrounding mode, the connecting plate is used for being connected with a frame, the battery bin is used for containing a battery, and good heat insulation performance is achieved between the battery bin and the frame. And the temperatures of the batteries in the battery compartment are kept consistent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and in particular to a battery box, a battery assembly and a vehicle. BACKGROUND

[0002] Currently, engineering machinery on the market mainly uses lithium iron phosphate (LiFePO4) batteries. The performance of lithium iron phosphate (LiFePO4) batteries is greatly affected by temperature, and therefore reasonable heat preservation measures are needed to improve battery performance and use safety, so as to ensure the safety of the battery.

[0003] In related technologies, a heat preservation layer is pasted in the battery compartment skin to achieve heat preservation for the battery in the battery compartment. However, the battery compartment is installed on the vehicle frame, and the bottom surface of the battery compartment skin is still in direct contact with the vehicle frame, resulting in a large amount of heat exchange between the battery compartment and the vehicle frame. UTILITARIAN CONTENT

[0004] The present application provides a battery box, a battery assembly and a vehicle. The battery compartment and the vehicle frame have good heat insulation, and the temperature of the battery in the battery compartment is consistent.

[0005] The battery box comprises a box body assembly and a connecting assembly. The box body assembly comprises a shell and a first heat preservation layer. The shell has an opening, and the first heat preservation layer is installed on the inner wall of the shell. The connecting assembly comprises a connecting plate and a second heat preservation layer. The second heat preservation layer is installed on the inner side of the connecting plate. The connecting plate is connected to the shell and covers the opening to enclose a battery compartment. The connecting plate is used to connect the vehicle frame, and the battery compartment is used to accommodate the battery.

[0006] Based on the battery box of the present application, the shell and the connecting plate are connected to form a battery compartment. The connecting plate is used to connect the vehicle frame when constituting the bottom shell of the battery box. Since the inner wall of the connecting plate (the side of the connecting plate away from the vehicle frame) is provided with a second heat preservation layer, the second heat preservation layer reduces the heat exchange between the battery and the connecting plate, and thus reduces the heat exchange between the battery and the vehicle frame. At the same time, the first heat preservation layer reduces the heat exchange between the battery and the box body assembly, thereby reducing the temperature difference between different parts of the battery and improving the charging and discharging efficiency.

[0007] In some embodiments of the present application, the connecting plate is configured as a steel connecting plate.

[0008] Based on the above embodiments, since the connecting plate is used to connect the vehicle frame when constituting the bottom shell of the battery box, the connecting plate should have a certain strength to support the battery in the battery compartment. Configuring the connecting plate as a steel connecting plate ensures that the connecting plate has sufficient structural strength.

[0009] In some embodiments of the present application, the connecting plate has a first region and a second region surrounding the first region, the shell is connected with the connecting plate at the second region, the shell and the first region enclose the battery compartment, the second thermal insulation layer is installed on the first region, and the connecting plate is connected with the frame at the second region.

[0010] Based on the above-mentioned embodiments, the first region of the connecting plate is used to cooperate with the box body to enclose the battery compartment, the connecting plate is connected with the frame and the box body at the second region to ensure the integrity of the first region (i.e. without the need to open a connecting hole, etc.), thereby ensuring the sealing of the battery compartment and reducing the temperature difference of the battery; at the same time, the second region surrounds the first region, so that the edges of the box body can be connected with the connecting plate, facilitating the box body and the connecting plate to enclose a sealed battery compartment; at the same time, the periphery of the connecting plate can also be connected with the frame, so that a stronger connection strength can be established between the connecting plate and the frame.

[0011] In some embodiments of the present application, the shell comprises a box body and a cover body, the box body is installed on the connecting plate at the second region, the box body has a compartment opening, and the box body has the opening; the cover body is detachably installed on the box body and can cover the compartment opening; wherein the first thermal insulation layer is installed on the inner wall of the box body and the cover body.

[0012] Based on the above-mentioned embodiments, the shell comprises a box body and a cover body detachably installed on the box body, when the cover body is separated from the box body, the user can put or take out the battery to the battery compartment through the compartment opening, realizing the replacement of the battery.

[0013] In some embodiments of the present application, the box body comprises a main body part and a flange part, the main body part has the opening and the compartment opening; the flange part is fixed to the main body part and connected with the connecting plate at the second region.

[0014] Based on the above-mentioned embodiments, the flange part is connected with the connecting plate at the second region, realizing the connection between the box body and the connecting plate, the main body part and the first region of the connecting plate enclose the battery compartment, and the compartment opening is provided for disassembling the battery, and the second thermal insulation layer enters the opening of the battery compartment.

[0015] In some embodiments of the present application, the first thermal insulation layer comprises a first thermal insulation part and a second thermal insulation part, the first thermal insulation part is installed on the inner wall of the box body; the second thermal insulation part is installed on the inner wall of the cover body, wherein when the cover body covers the compartment opening, the second thermal insulation layer, the first thermal insulation part and the second thermal insulation part wrap the battery.

[0016] Based on the above embodiment, the first heat preservation part is installed on the inner wall of the box body, and the second heat preservation part is installed on the inner wall of the cover body. When the cover body is separated from the box body, the first heat preservation part is separated from the second heat preservation part. In this way, the first heat preservation part, the second heat preservation part, and the first heat preservation layer can wrap the battery.

[0017] In some embodiments of the present application, the second heat preservation layer and the first heat preservation layer are configured as fire-resistant heat preservation layers.

[0018] Based on the above embodiment, the first heat preservation layer and the second heat preservation layer are configured as fire-resistant heat preservation layers, which improves the safety of the battery box and enables the user to have more escape time after the battery catches fire.

[0019] In a second aspect, the embodiments of the present application provide a battery assembly, which comprises a battery and a battery box as described above. The battery is in the battery compartment and is fixedly connected with the connecting plate.

[0020] Based on the above embodiment, due to the battery box described above, the battery box can reduce heat exchange between the battery and the external environment, reduce the temperature difference of the battery, and improve the charging and discharging efficiency of the battery.

[0021] In some embodiments of the present application, the battery is connected with a wire harness and / or a pipeline. The box body assembly is provided with a wire passing hole communicating with the battery compartment. A sealing layer is arranged between the wire passing hole and the wire harness or the pipeline.

[0022] Based on the above embodiment, the box body assembly is provided with a wire passing hole for the wire harness or the pipeline connected with the battery to pass through. A sealing layer is arranged between the hole wall of the wire passing hole and the wire harness or the pipeline to ensure the sealing property of the battery compartment, thereby reducing the temperature difference of the battery and ensuring the charging and discharging efficiency of the battery.

[0023] In a third aspect, the embodiments of the present application provide a vehicle, which comprises a battery assembly as described above.

[0024] Based on the vehicle of the embodiments of the present application, since the vehicle has the battery assembly described above, the battery assembly has the battery box described above, the battery box can reduce the temperature difference of the battery and ensure the charging and discharging efficiency of the battery, so that the vehicle needs shorter charging time and has stronger power during driving. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 FIG. 1 is a structural schematic diagram of a battery box in an embodiment of the present application;

[0027] Figure 2 FIG. 2 is a structural schematic diagram of a connecting assembly in an embodiment of the present application;

[0028] Figure 3 FIG. 3 is a structural schematic diagram of a box body in an embodiment of the present application;

[0029] Figure 4 FIG. 4 is a structural schematic diagram of a cover in an embodiment of the present application.

[0030] FIG. 10 is a structural schematic diagram of a box body assembly in an embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0032] Currently, engineering machinery on the market mainly uses lithium iron phosphate (LiFePO4) batteries. The performance of lithium iron phosphate (LiFePO4) batteries is greatly affected by temperature, so reasonable heat preservation measures are needed to improve battery performance and safety to ensure the safety of the battery.

[0033] The lithium iron phosphate (LiFePO4) battery is greatly affected by temperature in the following aspects:

[0034] 1. The charging and discharging efficiency of lithium iron phosphate batteries will be significantly reduced at low temperature, which can easily cause insufficient internal reaction of the battery. Long-term use will accelerate the aging of the battery and shorten the service life of the battery.

[0035] 2. Under extreme low temperature conditions, the viscosity of the internal electrolyte of the lithium iron phosphate battery increases, which can cause the internal pressure of the battery to increase and pose a safety hazard.

[0036] 3. In an environment with large temperature fluctuations, the performance difference between battery monomers will increase, affecting the overall performance of the battery pack.

[0037] In the related art, a heat preservation layer is pasted in the battery compartment skin to achieve heat preservation for the battery in the battery compartment. However, the battery compartment is mounted on the vehicle frame, and the bottom surface of the battery compartment is still in direct contact with the vehicle frame after the battery compartment skin, resulting in a large amount of heat exchange between the battery compartment and the vehicle frame, and causing inconsistent temperatures of the battery at different positions.

[0038] The embodiments of the present application provide a battery box, a battery assembly and a vehicle, the battery compartment and the vehicle frame have good heat insulation, the temperature of the battery in the battery compartment is consistent, and the battery has higher charging and discharging efficiency.

[0039] To solve the above technical problems, please refer to Figures 1 to 3 As shown in FIG. 1, in a first aspect, the embodiments of the present application provide a battery box, which comprises a box body assembly 10 and a connecting assembly 20. The box body assembly 10 comprises a shell 11 and a first heat preservation layer. The shell 11 has an opening, and the first heat preservation layer is installed on the inner wall of the shell 11. The connecting assembly 20 comprises a connecting plate 21 and a second heat preservation layer 22. The second heat preservation layer 22 is installed on the inner side of the connecting plate 21. The connecting plate 21 is connected with the shell 11 and covers the opening to enclose a battery compartment. The connecting plate 21 is used to connect the vehicle frame, and the battery compartment is used to accommodate the battery.

[0040] In the embodiments of the present application, the connecting plate 21 is used to support the box body assembly 10, the battery and connect the vehicle frame. Therefore, the connecting plate 21 needs to have sufficient structural strength. In some embodiments of the present application, the connecting plate 21 is configured as a steel connecting plate, which not only ensures that the connecting plate 21 has sufficient connection strength, but also has low cost. Of course, it can be understood that the connecting plate 21 can also be made of other materials with high structural strength, such as aluminum alloy or carbon fiber composite material, etc. The aluminum alloy not only has sufficient structural strength, but also has good corrosion resistance, which is suitable for the working environment of the connecting plate 21 exposed to wind and sun. The carbon fiber composite material has extremely high structural strength, excellent fatigue resistance and corrosion resistance, and can withstand the bumps of the vehicle.

[0041] Based on the battery box of the embodiments of the present application, the shell 11 and the connecting plate 21 are connected to enclose the battery compartment. The connecting plate 21 is used to connect the vehicle frame when constituting the bottom shell of the battery box. Since the inner wall of the connecting plate 21 (the side of the connecting plate 21 away from the vehicle frame) is provided with the second heat preservation layer 22, the second heat preservation layer 22 reduces the heat exchange between the battery and the connecting plate 21, and then reduces the heat exchange between the battery and the vehicle frame. At the same time, the first heat preservation layer reduces the heat exchange between the battery and the box body assembly 10, reduces the temperature difference between different positions of the battery, and improves the charging and discharging efficiency. In addition, the first heat preservation layer and the second heat preservation layer 22 reduce the problem that the low temperature environment of the outside environment causes the battery temperature to decrease, the internal pressure of the battery to increase, and the reaction to be insufficient.

[0042] Please refer to Figure 2As shown, in some embodiments of this application, the connecting plate 21 has a first region 211 and a second region 212 surrounding the first region 211. The housing 11 is connected to the connecting plate 21 in the second region 212. The housing 11 and the first region 211 enclose a battery compartment. The second insulation layer 22 is installed in the first region 211. The connecting plate 21 is connected to the vehicle frame in the second region 212.

[0043] The battery compartment is used to house the battery. It is understood that, for the battery to be stable within the compartment, it needs to be close to the compartment's wall so that the wall supports it. Therefore, the shape of the battery compartment corresponds to the shape of the battery. Since common automotive batteries are rectangular, in some embodiments of this application, the battery compartment is configured as a rectangular connecting plate 21 corresponding to the battery. The first region 211 of the connecting plate 21 forms the bottom wall of the battery compartment, and this first region 211 is also rectangular.

[0044] The second region 212 is used for connecting the connecting plate 21 to the box 111 and connecting the connecting plate 21 to the frame. In this application embodiment, the shape of the second region 212 is not limited, as long as the second region 212 can realize the connection between the connecting plate 21 and the box 111 and the connection between the connecting plate 21 and the frame. In some embodiments of this application, the second region 212 is configured as a rectangular frame.

[0045] The first region 211 of the connecting plate 21 is used to cooperate with the box body 111 to form a battery compartment. The connection between the connecting plate 21 and the frame and the box body 111 in the second region 212 ensures the integrity of the first region 211 (i.e., no need to open connection holes, etc.), thus ensuring the airtightness of the battery compartment and reducing the temperature difference in various parts of the battery. At the same time, the second region 212 surrounds the first region 211, so that the edges of the box body 111 can be connected to the connecting plate 21, which facilitates the box body 111 and the connecting plate 21 to form a sealed battery compartment. At the same time, the periphery of the connecting plate 21 can also be connected to the frame, so that a stronger connection can be established between the connecting plate 21 and the frame.

[0046] Please refer to Figure 1 , Figure 3 as well as Figure 4 As shown, in some embodiments of this application, the housing 11 includes a box body 111 and a cover 112. The box body 111 is mounted on the connecting plate 21 in the second region 212. The box body 111 has a compartment opening and an opening. The cover 112 is detachably mounted on the box body 111 and can cover the compartment opening. A first insulation layer is installed on the inner wall of the box body 111 and the cover 112.

[0047] The shell 11 includes a box body 111 and a cover body 112 detachably mounted on the box body 111. When the cover body 112 is separated from the box body 111, a user can put or take out a battery to or from the battery compartment through the compartment opening, so as to replace the battery.

[0048] As shown in Figure 3 In some embodiments of the present application, the box body 111 includes a main body part 1111 and a flange part 1112. The main body part 1111 has an opening and a compartment opening. The flange part 1112 is fixed to the main body part 1111 and connected to the connecting plate 21 at the second region 212.

[0049] The main body part 1111 is used to enclose the battery compartment together with the connecting plate 21. The flange part 1112 is used to connect the box body 111 to the connecting plate 21. The flange part 1112 can be divided into multiple segments. In some embodiments of the present application, the flange part 1112 is integrally formed with the main body part 1111.

[0050] As shown in Figure 3 and Figure 4 In some embodiments of the present application, the first thermal insulation layer includes a first thermal insulation part 121 and a second thermal insulation part 122. The first thermal insulation part 121 is mounted on the inner wall of the box body 111. The second thermal insulation part 122 is mounted on the inner wall of the cover body 112. When the cover body 112 covers the compartment opening, the second thermal insulation layer 22, the first thermal insulation part 121 and the second thermal insulation part 122 wrap the battery.

[0051] The first thermal insulation part 121 is mounted on the inner wall of the box body 111. The second thermal insulation part 122 is mounted on the inner wall of the cover body 112. When the cover body 112 is separated from the box body 111, the first thermal insulation part 121 is separated from the second thermal insulation part 122 together with the cover body 112. In this way, the first thermal insulation part 121, the second thermal insulation part 122 and the first thermal insulation layer can wrap the battery.

[0052] In some embodiments of the present application, the second thermal insulation layer 22 and the first thermal insulation layer are both configured as fire-resistant thermal insulation layers. The configuration of the first thermal insulation layer and the second thermal insulation layer as fire-resistant thermal insulation layers improves the safety of the battery box. After the battery catches fire, the configuration can give the user more time to escape. The materials of the first thermal insulation layer and the second thermal insulation layer 22 in the embodiments of the present application can be flame-retardant foam materials, mica insulation flame-retardant protective materials, aerogel felt materials, ceramicized silicone rubber composite materials, etc.

[0053] In a second aspect, the embodiments of the present application provide a battery assembly. The battery assembly includes a battery and the above-described battery box. The battery is in the battery compartment and fixedly connected to the connecting plate 21.

[0054] Based on the above embodiment, due to the battery box, heat exchange between the battery and the external environment is reduced, the temperature difference of the battery is reduced, and the charging and discharging efficiency of the battery is improved.

[0055] The battery includes a battery shell and a plurality of battery packs arranged in the battery shell, and the plurality of battery packs are electrically connected to each other. In the embodiment of the application, reducing the temperature difference of the battery mainly refers to reducing the temperature difference of the battery packs in the battery.

[0056] In the embodiment of the application, the battery shell is provided with a first connecting hole, and the connecting plate 21 is provided with a second connecting hole. After the battery is placed in the battery compartment, the battery is connected to the battery box through the hole wall between the first connecting hole and the second connecting hole.

[0057] Please refer to Figure 4 In some embodiments of the application, the battery is connected to a wire harness and / or a pipeline, and the box body assembly 10 is provided with a wire passing hole 1121 communicating with the battery compartment. A sealing layer is arranged between the wire passing hole 1121 and the wire harness or the pipeline.

[0058] The wire harness in the embodiment of the application can be a wire harness for connecting the battery to an external electrical device. When the vehicle has an energy recovery function, the external electrical device can be not only a power consumption device but also a power supply device. The pipeline can be a cooling medium pipeline for cooling the battery.

[0059] The wire passing hole 1121 is used for the wire harness or the pipeline to pass through. It can be understood that the battery is necessarily connected to a plurality of wire harnesses and a plurality of pipelines. Therefore, the number of wire passing holes 1121 in the embodiment of the application can be multiple, and the shapes, sizes and positions of the plurality of wire passing holes 1121 in the box body assembly 10 are different. Figure 1 As shown in

[0060] The box body assembly 10 is provided with a wire passing hole 1121 for the wire harness or the pipeline connected to the battery to pass through. The sealing layer arranged between the hole wall of the wire passing hole 1121 and the wire harness or the pipeline ensures the sealing of the battery compartment, thereby reducing the temperature difference of the battery and ensuring the charging and discharging efficiency of the battery. The sealing layer in the embodiment of the application is formed by applying and curing a sealant.

[0061] In a third aspect, the embodiment of the application provides a vehicle, which includes a vehicle frame and the above battery assembly. The connecting plate 21 is fixed to the vehicle frame.

[0062] Based on the vehicle of the embodiment of the present application, since the vehicle has the battery assembly, the battery assembly has the battery box, the battery box can reduce the heat exchange between the battery and the frame, i.e. the battery box can reduce the temperature difference of each part of the battery, ensure the charging and discharging efficiency of the battery, then ensure the shorter charging time of the vehicle and the stronger power of the vehicle in the driving process.

[0063] The vehicle in the embodiment of the present application can be any kind of electric vehicle or hybrid vehicle, for example, commercial vehicle, household vehicle or various types of unmanned vehicle, as long as the vehicle needs to use the battery, the battery assembly in the embodiment of the present application can be used. It can be understood that for part of the frameless bearing type vehicle, for example, small unmanned delivery vehicle, the battery assembly can be fixed to the frame of the vehicle through the connecting plate 21.

[0064] The same or similar reference numerals in the drawings of the embodiment of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore the positional relationship described in the drawings is only used for exemplary illustration, and cannot be understood as a limitation of the present patent, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0065] The above is only the preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery case characterized by comprising: The application relates to a battery assembly. The battery assembly comprises a box body assembly and a connecting assembly. The box body assembly comprises a shell and a first thermal insulation layer. The connecting assembly comprises a connecting plate and a second thermal insulation layer.

2. The battery pack of claim 1, wherein, The second thermal insulation layer is mounted on the inner side of the connecting plate.

3. The battery pack of claim 1, wherein, The connecting plate is connected with the shell and covers the opening to form a battery compartment.

4. The battery pack of claim 3, wherein, The connecting plate is used to connect with a vehicle frame. The battery compartment is used to accommodate a battery. The connecting plate is made of steel. The connecting plate has a first area and a second area surrounding the first area.

5. The battery pack of claim 4, wherein, The shell is connected with the connecting plate at the second area. The shell and the first area form the battery compartment. The second thermal insulation layer is mounted on the first area.

6. The battery pack of claim 4, wherein, The connecting plate is connected with the vehicle frame at the second area. The shell comprises a box body and a cover. The box body is mounted on the connecting plate at the second area. The box body has a compartment opening and the opening.

7. The battery pack of claim 1, wherein, The cover is detachably mounted on the box body and covers the compartment opening.

8. A battery assembly characterized by, The first thermal insulation layer is mounted on the inner wall of the box body and the cover. The box body comprises a main body and a flange. The main body has the opening and the compartment opening.

9. The battery assembly of claim 8, wherein, The flange is fixed on the main body and connected with the connecting plate at the second area.

10. A vehicle characterized by comprising: The first thermal insulation layer comprises a first thermal insulation part and a second thermal insulation part. The first thermal insulation part is mounted on the inner wall of the box body. The second thermal insulation part is mounted on the inner wall of the cover. When the cover covers the compartment opening, the second thermal insulation layer, the first thermal insulation part and the second thermal insulation part wrap the battery. The second thermal insulation layer and the first thermal insulation layer are made of fireproof thermal insulation layer. The battery assembly comprises the battery box and a battery. The battery is accommodated in the battery compartment and fixedly connected with the connecting plate. The battery is connected with a wire harness and / or a pipeline. The box body assembly is provided with a wire passing hole communicating with the battery compartment. A sealing layer is arranged between the wire passing hole and the wire harness or the pipeline. The application relates to a vehicle. The vehicle comprises a vehicle frame and the battery assembly. The connecting plate is fixed to the vehicle frame.

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