Battery box and battery pack

Abstract

The utility model provides a battery box and a battery pack, the battery box comprises a box body and a box cover assembly, the box body comprises an accommodating cavity for accommodating a battery module and polystyrene foam, and one side of the box body is provided with a mounting port communicated with the accommodating cavity; the box cover assembly comprises a cover plate and an isolation layer, the cover plate is connected with the box body and covers the mounting opening, the isolation layer is arranged on the plate face, facing the side of the containing cavity, of the cover plate, and the isolation layer is used for separating at least part of the plate face from the polystyrene foam in the containing cavity. According to the battery box provided by the embodiment of the invention, the isolation layer is arranged on the plate surface of one side, facing the accommodating cavity of the box body, of the box cover, and at least part of the plate surface is separated from the polystyrene foam in the accommodating cavity, so that the bonding strength between the cover plate and the polystyrene foam can be reduced, and the cover plate is more convenient to disassemble; the polystyrene foam and other parts are not easy to damage in the cover plate dismounting process, so that the maintenance cost of the battery pack is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery box and a battery pack. Background Art

[0002] In the prior art, after the battery modules of a battery pack are installed in a battery box, foam glue is filled between the battery modules and the inner wall of the battery box to better protect the battery modules. However, the foam glue adheres to the battery box cover, making it difficult to remove the battery box cover and affecting the maintenance of the components inside the battery box. Utility Model Content

[0003] The embodiments of the present application provide a battery box and a battery pack, which can improve the technical problem that the foam glue in the battery box is adhered to the box cover, making it difficult to remove the battery box cover.

[0004] In a first aspect, an embodiment of the present application provides a battery box, comprising:

[0005] The box body includes a receiving cavity for receiving the battery module and the foam glue, and a mounting opening communicating with the receiving cavity is formed at one side of the box body;

[0006] The box cover assembly includes a cover plate and an isolation layer. The cover plate is connected to the box body and covers the installation port. The isolation layer is arranged on the plate surface of the cover plate facing the accommodating cavity. The isolation layer is used to separate at least part of the plate surface from the foam glue in the accommodating cavity.

[0007] In one embodiment, the plate surface includes an isolation area and a sealing area, the isolation layer is provided in the isolation area, the sealing area is located at the periphery of the isolation area, and a sealing member is provided between the sealing area and the battery box.

[0008] In one embodiment, the sealing area extends along the circumference of the isolation area to form an annular structure.

[0009] In one embodiment, the sealing area is adjacent to the isolation area; the orthographic projection of the isolation layer on the plate surface overlaps with the isolation area, and the orthographic projection of the sealing member on the plate surface overlaps with the sealing area.

[0010] In one embodiment, the isolation layer is bonded to the board surface.

[0011] In one embodiment, the bonding strength between the isolation layer and the board surface is smaller than the bonding strength between the isolation layer and the foam adhesive; or

[0012] The bonding strength between the isolation layer and the board surface is greater than the bonding strength between the isolation layer and the foam glue.

[0013] In one embodiment, the isolation layer is a tearable film.

[0014] In one embodiment, the isolation layer is made of one or more materials selected from the group consisting of polyethylene terephthalate, polyvinyl chloride, and thermoplastic polyurethane.

[0015] In one embodiment, the thickness of the isolation layer is greater than or equal to 0.2 mm and less than or equal to 0.5 mm.

[0016] In a second aspect, an embodiment of the present application provides a battery pack, comprising:

[0017] A battery box, wherein the battery box is the battery box described above, comprising a box body and a box cover assembly, wherein the box body comprises a receiving cavity for accommodating a battery module and a foam glue, and a mounting opening communicating with the receiving cavity is provided at one side of the box body; the box cover assembly comprises a cover plate and an isolation layer, wherein the cover plate is connected to the box body and covers the mounting opening, and the isolation layer is provided on a plate surface of the cover plate facing the receiving cavity, and the isolation layer is used to isolate at least a portion of the plate surface from the foam glue in the receiving cavity;

[0018] A battery module is arranged in the accommodating cavity of the battery box;

[0019] The foam glue is filled between the battery module and the box cover assembly and box body of the battery box.

[0020] Beneficial effects of the embodiments of the present application:

[0021] The battery box provided in the embodiment of the present application provides an isolation layer on the side surface of the box cover facing the accommodating cavity of the box body, thereby isolating at least part of the plate surface from the foam glue in the accommodating cavity, thereby reducing the bonding strength between the cover plate and the foam glue. When the cover plate is removed from the box body, the isolation layer can be retained on the foam glue, or the isolation layer can be separated from the foam glue, or the isolation layer can be torn, with a part of the isolation layer remaining on the foam glue and the other part remaining on the plate surface of the cover plate, thereby making the removal of the cover plate more convenient. Moreover, it is not easy to cause damage to the foam glue and other parts during the removal of the cover plate, which is beneficial to reducing the maintenance cost of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 is a three-dimensional schematic diagram of an embodiment of a battery pack provided in an embodiment of the present application;

[0024] Figure 2 is a schematic diagram of the exploded structure of a battery pack provided in an embodiment of the present application;

[0025] Figure 3 yes Figure 1 Cross-sectional view along AA direction;

[0026] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0027] Figure 5 This is a structural diagram of an embodiment of a box cover assembly provided by an embodiment of the present application;

[0028] Figure 6 It is a schematic diagram of the exploded structure of an embodiment of the box cover assembly provided in an embodiment of the present application.

[0029] Battery pack 100; battery box 110; box body 111; accommodating cavity 1111; mounting opening 1112; bottom plate 1113; side plate 1114; connecting flange 1115; foam glue 112; box cover assembly 113; cover plate 1131; plate surface 1132; sealing area 1133; isolation area 1134; isolation layer 1135; sealing section 1136; sealing member 114; sealing portion 1141. DETAILED DESCRIPTION

[0030] The following will provide a clear and complete description of the technical solutions in the embodiments of this application, in conjunction with the accompanying drawings. It should be understood that the described embodiments are only some of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments derived by those skilled in the art without inventive effort are within the scope of protection of this application. Furthermore, it should be understood that the specific embodiments described herein are intended only to illustrate and explain this application and are not intended to limit this application. In this application, unless otherwise indicated, directional terms such as "upper" and "lower" generally refer to the upper and lower parts of a device in actual use or operation, specifically the directions in the drawings; while "inner" and "outer" refer to the outline of the device. Furthermore, the terms "mounted," "connected," and "connected" should be interpreted broadly, meaning, for example, fixed, removable, or integral; directly or indirectly through an intermediary; and can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0031] Figure 1 It is a three-dimensional schematic diagram of an embodiment of a battery pack provided in an embodiment of the present application. Figure 2 It is a schematic diagram of the exploded structure of the battery pack provided in an embodiment of the present application. Figure 3 yes Figure 1 Cross-sectional view along the AA direction. Figure 4 yes Figure 3 The enlarged view of point A in the middle. Figures 1 to 4 As shown, the battery pack 100 includes a battery box 110 and a battery module (not shown in the figure). The battery box 110 includes a box body 111 and a box cover assembly 113. The box body 111 includes a receiving cavity 1111 for receiving the battery module and the foam 112. A mounting opening 1112 is provided on one side of the box body 111 and communicates with the receiving cavity 1111. The mounting opening 1112 is used to allow the battery module and other components of the battery pack 100 to be installed in the receiving cavity 1111. The box cover assembly 113 includes a cover plate 1131, which is connected to the box body 111 and covers the mounting opening 1112, thereby protecting the battery module and other components in the box body 111.

[0032] Continue to refer to Figures 2 to 4 The battery pack 100 further includes a foam glue 112, which fills the space between the battery module and the battery box 110 to further enhance the protection of the battery module. Specifically, after the battery module and other components of the battery pack 100 are installed in the accommodating cavity 1111 of the box body 111, the foam glue 112 can be sprayed in the accommodating cavity 1111, and the cover plate 1131 is placed over the installation opening 1112 of the box body 111, so that the cover plate 1131 covers the installation opening 1112. After the foam glue 112 expands, it fills the space between the battery module and the cover plate 1131 of the battery box 110 and the box body 111.

[0033] Among them, the battery module can include multiple battery cells, and the multiple battery cells are arranged in parallel in the accommodating cavity 1111 of the box body 111, and foam glue 112 is filled between each battery cell and the inner peripheral surface of the accommodating cavity 1111 of the box body 111 and the plate surface 1132 of the cover plate 1131 facing the accommodating cavity 1111.

[0034] In the related art, the foam glue filled between the cover and the box body of the battery module and battery box will stick to the cover, making it difficult to remove the cover of the battery box. If the battery distribution unit (BDU), battery management system (BMS) and other devices in the battery box fail, the cover cannot be opened to maintain these devices. The only option is to forcibly remove the cover, which can easily cause damage to other components of the battery pack. Alternatively, the battery pack can be directly replaced, increasing the after-sales cost of the battery pack.

[0035] In order to improve the above problems, the present invention provides a battery box. Figures 2 to 6 As shown, the battery box 110 comprises a box cover assembly 113, which comprises a cover plate 1131 and a separation layer 1135. The cover plate 1131 is connected with the box body 111 and covers the mounting port 1112 of the box body 111, so that the containing cavity 1111 of the box body 111 is a closed space. The separation layer 1135 is arranged on the plate surface 1132 of the cover plate 1131 on the side facing the containing cavity 1111, and is used to separate at least part of the plate surface 1132 from the foaming glue 112 in the containing cavity 1111.

[0036] The battery box 110 provided by the embodiments of the present application can reduce the bonding strength between the cover plate 1131 and the foaming glue 112 by arranging the separation layer 1135 on the plate surface 1132 of the cover plate 1131 on the side facing the containing cavity 1111 of the box body 111, so as to separate at least part of the plate surface 1132 from the foaming glue 112 in the containing cavity 1111. When the cover plate 1131 is detached from the box body 111, the separation layer 1135 can be retained on the foaming glue 112, or separated from the foaming glue 112, or torn, with part of the separation layer 1135 retained on the foaming glue 112 and the other part retained on the plate surface 1132 of the cover plate 1131, so that the cover plate 1131 is more convenient to detach, and the foaming glue 112 and other parts are less likely to be damaged during the detachment of the cover plate 1131, which is conducive to reducing the maintenance cost of the battery pack 100.

[0037] In some embodiments, the separation layer 1135 can be a tearable film. When the cover plate 1131 is detached from the box body 111, the separation layer 1135 is more likely to be torn, so that the cover plate 1131 is subjected to less pulling force and is more likely to be detached from the box body 111.

[0038] In some embodiments, the material of the separation layer 1135 can comprise one or more of polyethylene glycol terephthalate (PET), polyvinyl chloride (PVC) and thermoplastic polyurethane (TPU), so that the separation layer 1135 is more likely to be torn. Moreover, the bonding strength between the separation layer 1135 and the foaming glue 112 can be reduced, and when the cover plate 1131 is detached from the box body 111, the separation layer 1135 is more likely to be separated from the foaming glue 112, so that the cover plate 1131 is more likely to be detached.

[0039] In some embodiments, the isolation layer 1135 can be bonded to the plate surface 1132 of the cover plate 1131 to make the connection between the isolation layer 1135 and the cover plate 1131 more stable, thereby reducing the problem that after the cover plate 1131 is covered on the installation opening 1112 of the box body 111, the isolation layer 1135 falls off from the plate surface 1132 of the cover plate 1131, which causes part or all of the plate surface 1132 of the cover plate 1131 to directly bond to the foam glue 112 during the expansion of the foam glue 112.

[0040] The bonding strength between the isolation layer 1135 and the plate surface 1132 of the cover plate 1131 can be made smaller than the bonding strength between the isolation layer 1135 and the foam 112. Therefore, when the cover plate 1131 is removed from the box body 111, the isolation layer 1135 is more easily separated from the plate surface 1132 of the cover plate 1131, which not only makes the removal of the cover plate 1131 easier, but also makes it easier for the isolation layer 1135 to remain intact.

[0041] Alternatively, the bonding strength between the isolation layer 1135 and the panel 1132 may be greater than the bonding strength between the isolation layer 1135 and the foam 112. This allows the isolation layer 1135 to be more easily separated from the foam 112 when the cover 1131 is removed from the box body 111, making it easier to remove the cover 1131 and keeping the isolation layer 1135 intact.

[0042] In other embodiments, the isolation layer 1135 may be formed by coating the plate surface 1132 of the cover plate 1131 facing the accommodating cavity 1111 of the box body 111. Alternatively, the isolation layer 1135 may be attached to the plate surface 1132 of the cover plate 1131 facing the accommodating cavity 1111 of the box body 111 by electrostatic adsorption or vacuum adsorption.

[0043] In some embodiments, the thickness of the isolation layer 1135 can be less than or equal to 0.5 mm to avoid the problem that the isolation layer 1135 is too thick and is difficult to tear when the cover 1131 is removed from the box body 111, thereby making it difficult to separate the cover 1131 from the foam 112. The thickness of the isolation layer 1135 can be 0.45 mm, 0.35 mm, 0.25 mm, etc., depending on the material of the isolation layer 1135.

[0044] Furthermore, the thickness of isolation layer 1135 can be greater than or equal to 0.2 mm to provide a certain strength to isolation layer 1135 and reduce the risk of damage during installation on the side of plate 1114 of cover plate 1131 facing accommodating cavity 1111. The thickness of isolation layer 1135 can be 0.3 mm, 0.4 mm, etc., depending on the material of isolation layer 1135.

[0045] Figure 5 It is a structural schematic diagram of an embodiment of a box cover assembly provided in an embodiment of the present application. Figure 6 This is a schematic diagram of the exploded structure of an embodiment of the box cover assembly provided by the embodiment of the present application. Figures 3 to 6 As shown, the plate surface 1132 of the cover plate 1131 facing the accommodating cavity 1111 of the box body 111 includes a sealing area 1133. When the cover plate 1131 of the battery box 110 is connected to the box body 111, the sealing area 1133 of the cover plate 1131 and the box body 111 are sealed to improve the sealing of the accommodating cavity 1111 in the battery box 110. A sealing member 114 may be provided between the sealing area 1133 of the plate surface 1132 of the cover plate 1131 and the battery box 110 body to seal the gap between the cover plate 1131 and the battery box 110 body.

[0046] Specifically, if Figure 2 As shown, the body 111 of the battery box 110 includes a bottom plate 1113 and a plurality of side plates 1114 connected to the edges of the bottom plate 1113. The plurality of side plates 1114 are connected in sequence along the circumference of the bottom plate 1113. The bottom plate 1113 and the plurality of side plates 1114 enclose a receiving cavity 1111. The mounting opening 1112 is located at one end of the plurality of side plates 1114 away from the bottom plate 1113. The bottom plate 1113 is a rectangular plate, and the number of side plates 1114 is four, distributed around the bottom plate 1113. A connecting flange 1115 is provided on the side of each side plate 1114 facing away from the receiving cavity 1111, and the plurality of connecting flanges 1115 are connected in sequence to form an annular structure. The connecting flange 1115 is arranged in a plate shape and is arranged opposite to the sealing area 1133 of the plate surface 1132 of the cover plate 1131.

[0047] The sealing area 1133 of the plate surface 1132 of the cover plate 1131 extends along the circumference of the cover plate 1131 in an annular structure, thereby corresponding to the connecting flange 1115 connected in an annular structure. The sealing area 1133 includes a plurality of sealing segments 1136 sequentially connected along the cover plate 1131. The number of the plurality of sealing segments 1136 is equal to the number of the plurality of connecting flanges 1115 and corresponds one-to-one.

[0048] The seal 114 is positioned between the annular sealing area 1133 and the connecting flange 1115, which is connected to the annular structure. One side of the seal 114 abuts the sealing area 1133, while the other side of the seal 114 abuts the connecting flange 1115, thereby sealing the gap between the sealing area 1133 and the connecting flange 1115. The seal 114 is an annular structure extending along the sealing area 1133. The seal 114 includes a plurality of sealing portions 1141 connected in sequence along the sealing area 1133. The number of the plurality of sealing portions 1141 is equal to the number of the plurality of sealing segments 1136, and they correspond one to one.

[0049] It should be noted that the sealing member 114 can be arranged on the sealing area 1133 of the plate surface 1132 of the cover plate 1131 first, and when the cover plate 1131 is connected with the box body 111, the side of the sealing member 114 away from the cover plate 1131 abuts against the side of the connecting flange 1115 facing the cover plate 1131, so as to realize the sealing between the cover plate 1131 and the box body 111. Alternatively, the sealing member 114 can be arranged on the side of the connecting flange 1115 facing the cover plate 1131 first, and when the cover plate 1131 is connected with the box body 111, the side of the sealing member 114 away from the connecting flange 1115 abuts against the sealing area 1133 of the plate surface 1132 of the cover plate 1131.

[0050] In some embodiments, the plate surface 1132 of the cover plate 1131 on the side facing the accommodating cavity 1111 of the box body 111 can include an isolation area 1134, and an isolation layer 1135 is arranged on the isolation area 1134. The sealing area 1133 of the plate surface 1132 of the cover plate 1131 is located outside the periphery of the isolation area 1134. In this way, the isolation layer 1135 arranged on the sealing area 1133 of the plate surface 1132 of the cover plate 1131 can avoid affecting the sealing effect between the sealing area 1133 of the plate surface 1132 and the box body 111.

[0051] In some embodiments, the sealing area 1133 can extend in a ring shape along the periphery of the isolation area 1134, so as to avoid the isolation layer 1135 affecting the sealing effect between the cover plate 1131 and the box body 111 around the cover plate 1131.

[0052] In some embodiments, the sealing area 1133 can be adjacent to the isolation area 1134, so that the sealing area 1133 and the isolation area 1134 are as close as possible, so that the isolation layer 1135 and the sealing member 114 are as close as possible, the width of the gap between the sealing member 114 and the isolation layer 1135 is reduced, the area of the foaming glue 112 directly bonding with the plate surface 1132 of the cover plate 1131 through the gap between the isolation layer 1135 and the sealing member 114 is reduced, and the bonding strength between the cover plate 1131 and the foaming glue 112 is reduced as much as possible.

[0053] The orthographic projection of the isolation layer 1135 on the plate surface 1132 can overlap with the isolation area 1134, and the orthographic projection of the seal 114 on the plate surface 1132 can overlap with the sealing area 1133, so that the isolation layer 1135 and the seal 114 are as close to each other as possible. Specifically, the cover plate 1131 is a rectangular plate. The plate surface 1132 of the cover plate 1131 facing the accommodating cavity 1111 of the box body 111 is a rectangular surface. The isolation area 1134 is a rectangular area. The isolation layer 1135 is also rectangular and overlaps with the isolation area 1134. The sealing area 1133 is adjacent to the outer periphery of the isolation area 1134, and the sealing area 1133 extends along the circumference of the isolation area 1134 to form an annular structure. The seal 114 also extends along the circumference of the isolation layer 1135 to form an annular structure, and the seal 114 overlaps with the sealing area 1133.

[0054] An embodiment of the present application also provides a battery pack, which includes a battery box. The specific structure of the battery box refers to the above embodiment. Since this battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0055] Among them, the battery pack 100 includes a battery box 110, a battery module and a foam glue 112. The structure of the battery box 110 can refer to the above embodiments; the battery module is arranged in the accommodating cavity 1111 of the battery box 110; the foam glue 112 is filled between the battery module and the box cover assembly 113 and the box body 111 of the battery box 110.

[0056] The battery pack 100 provided in the embodiment of the present application provides an isolation layer 1135 on the side plate 1114 of the battery box 110 facing the accommodating cavity 1111 of the box body 111, thereby isolating at least part of the plate surface 1132 from the foam glue 112 in the accommodating cavity 1111, thereby reducing the bonding strength between the cover plate 1131 and the foam glue 112. When the cover plate 1131 is removed from the box body 111, the isolation layer 1135 can be retained on the foam glue 112, or the isolation layer 1135 can be separated from the foam glue 112, or the isolation layer 1135 can be torn, with a portion of the isolation layer 1135 remaining on the foam glue 112 and the other portion remaining on the plate surface 1132 of the cover plate 1131, thereby making the removal of the cover plate 1131 more convenient. Moreover, it is not easy to cause damage to the foam glue 112 and other parts during the removal of the cover plate 1131, which is beneficial to reducing the maintenance cost of the battery pack 100.

[0057] The battery box and battery pack provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; in order to simplify the disclosure of the present application, the components and settings of specific examples are described above. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various implementation methods and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but a person of ordinary skill in the art can recognize the application of other processes and / or the use of other materials.

[0058] Those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery box, characterized in that: include: The box body includes a receiving cavity for receiving the battery module and the foam glue, and a mounting opening communicating with the receiving cavity is formed at one side of the box body; The box cover assembly includes a cover plate and an isolation layer. The cover plate is connected to the box body and covers the installation port. The isolation layer is arranged on the plate surface of the cover plate facing the accommodating cavity. The isolation layer is used to separate at least part of the plate surface from the foam glue in the accommodating cavity.

2. The battery box according to claim 1, wherein: The plate surface includes an isolation area and a sealing area. The isolation layer is provided in the isolation area. The sealing area is located at the periphery of the isolation area. A sealing member is provided between the sealing area and the battery box.

3. The battery box according to claim 2, wherein: The sealing area extends along the circumference of the isolation area and has an annular structure.

4. The battery box according to claim 2, wherein: The sealing area is adjacent to the isolation area; the orthographic projection of the isolation layer on the plate surface overlaps with the isolation area; and the orthographic projection of the sealing member on the plate surface overlaps with the sealing area.

5. The battery box according to claim 1, wherein: The isolation layer is bonded to the board surface.

6. The battery box according to claim 5, characterized in that: The bonding strength between the isolation layer and the board surface is smaller than the bonding strength between the isolation layer and the foam glue; or The bonding strength between the isolation layer and the board surface is greater than the bonding strength between the isolation layer and the foam glue.

7. The battery box according to any one of claims 1 to 6, characterized in that: The isolation layer is an easy-to-tear film.

8. The battery box according to any one of claims 1 to 6, characterized in that: The material of the isolation layer includes one or more of polyethylene terephthalate, polyvinyl chloride and thermoplastic polyurethane.

9. The battery box according to any one of claims 1 to 6, characterized in that: The thickness of the isolation layer is greater than or equal to 0.2 mm and less than or equal to 0.5 mm.

10. A battery pack, characterized in that: include: A battery box, wherein the battery box is the battery box according to any one of claims 1 to 9; A battery module is arranged in the accommodating cavity of the battery box; The foam glue is filled between the battery module and the box cover assembly and box body of the battery box.

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