Battery case and multi-layer battery system

Abstract

Provided in the present application are a battery case and a multi-layer battery system. The multi-layer battery system comprises a battery case, an electrically conductive assembly and a plurality of battery cell assemblies (20), wherein the battery case comprises a bottom protection plate (11), a case cover (13), and a case body, which is connected to the bottom protection plate (11) and the case cover (13), the case body comprising at least two stacked assembly cases (12), and openings being provided at the upper and lower ends of the assembly cases (12); the plurality of battery cell assemblies (20) are stacked, and the battery cell assemblies (20) are arranged in each of the assembly cases (12); and the electrically conductive assembly is arranged in the battery case, and is configured to electrically connect the plurality of battery cell assemblies (20).

Description

Battery box and multi-layer battery system

[0001] The present application claims priority to the Chinese patent application No. 202423267286.8, filed on December 27, 2024, to the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety.

[0002] TECHNICAL FIELD

[0003] The present application relates to the technical field of power batteries, in particular to a battery box and a multi-layer battery system.

[0004] BACKGROUND

[0005] With the development of power batteries, power batteries are increasingly widely used. When the battery pack is used for a logistics vehicle, a bus or some energy storage projects and needs to increase the power, multiple battery packs are stacked and copper bars are added outside for series and parallel connection.

[0006] TECHNICAL PROBLEM

[0007] This way of increasing the power by stacking the battery packs needs to additionally increase the frame and the connecting structure, which is inconvenient to assemble, low in efficiency, high in cost, low in volume utilization and large in space occupation.

[0008] TECHNICAL SOLUTION

[0009] In a first aspect, an embodiment of the present application provides a battery box, comprising:

[0010] The battery box comprises a bottom guard plate, a box cover and a box body connected with the bottom guard plate and the box cover respectively, the box body comprises at least two spliced boxes stacked, and the upper and lower ends of the spliced box are provided with openings.

[0011] In a second aspect, an embodiment of the present application provides a multi-layer battery system, comprising:

[0012] The battery box described above;

[0013] A plurality of battery cell assemblies, the plurality of battery cell assemblies are stacked, and each spliced box is provided with a battery cell assembly;

[0014] A conductive assembly arranged in the battery box, the conductive assembly is configured to electrically connect the plurality of battery cell assemblies.

[0015] ADVANTAGEOUS EFFECTS

[0016] The battery box provided in the application is characterized in that the upper and lower ends of the spliced box are provided with openings, and the box body is formed by at least two spliced boxes. Compared with the related art in which a plurality of battery packs are stacked, the above battery box eliminates the bottom plate and the top plate of each battery pack, is beneficial to reducing the overall height of the battery box and the material of the battery box on the basis of the same number of battery cell assemblies, can improve the volume utilization rate and reduce the cost.

[0017] The plurality of spliced boxes form a box body, the number of battery cell assemblies can be selected according to the actual required power, and the number of spliced boxes used can be selected according to the number of battery cell assemblies. The total power of the multi-layer battery system is more flexible to adjust, and different specifications of battery boxes do not need to be customized, and the compatibility is better.

[0018] The multi-layer battery system provided in the application includes the above battery box, has high volume utilization rate, and is beneficial to reducing the cost.

[0019] BRIEF DESCRIPTION OF DRAWINGS

[0020] FIG. 1 is a first structural schematic diagram of a multi-layer battery system provided in the application;

[0021] FIG. 2 is a partial structural schematic diagram of a spliced box provided in the application;

[0022] FIG. 3 is a first structural schematic diagram of a spliced box provided in the application;

[0023] FIG. 4 is a second structural schematic diagram of a multi-layer battery system provided in the application;

[0024] FIG. 5 is a sectional view of a multi-layer battery system provided in the application;

[0025] FIG. 6 is a second structural schematic diagram of a spliced box provided in the application;

[0026] FIG. 7 is a structural schematic diagram of a multi-layer battery system provided in the application when a side cover and a box cover are not assembled;

[0027] FIG. 8 is a distribution diagram of a first sealing adhesive layer, a second sealing adhesive layer and a third sealing adhesive layer provided in the application.

[0028] In the drawings:

[0029] 11, bottom guard plate; 12, spliced box; 12a, containing body; 12b, connecting plate; 121, first side plate; 122, second side plate; 123, partition plate; 124, frame; 1241, second sealing glue storage groove; 125, first sealing glue storage groove; 13, box cover; 14, electrical box; 141, shielding plate; 142, annular side wall; 15, side cover; 16, second containing cavity; 17, first containing cavity; 171, first sealing glue layer; 172, second sealing glue layer; 173, third sealing glue layer; 20, battery cell assembly; 30, liquid cooling assembly; 31, first liquid cooling plate; 32, second liquid cooling plate.

[0030] Embodiments of the present application

[0031] The embodiment provides a multi-layer battery system, which has large electric quantity and can meet the power demand. As shown in FIG. 1, the multi-layer battery system comprises a battery box and a plurality of battery cell assemblies 20 and a conductive assembly arranged in the battery box, the plurality of battery cell assemblies 20 are arranged in a vertical direction in a stacked manner, and the conductive assembly is configured to electrically connect the plurality of battery cell assemblies 20 to realize series connection of the plurality of battery cell assemblies 20, thereby increasing the electric quantity.

[0032] In the related art, in order to ensure large electric quantity, a plurality of battery packs are arranged in a stacked manner, and a copper bar is arranged outside to connect the plurality of battery packs. This not only needs to increase a frame for fixing the plurality of battery packs and a connecting structure, resulting in difficult assembly and high cost, but also has low volume utilization and occupies a large space.

[0033] In the embodiment, the battery box comprises a bottom guard plate 11, a box body and a box cover 13 arranged in sequence from bottom to top, the upper and lower ends of the box body are open, the bottom guard plate 11 is connected with the bottom end of the box body and is configured to shield the opening at the bottom end of the box body, and the box cover 13 is connected with the top end of the box body and is configured to shield the opening at the top end of the box body. The box body comprises at least two spliced boxes 12 arranged in a stacked manner, each spliced box 12 has an open structure at the upper and lower ends, and each spliced box 12 is correspondingly provided with a battery cell assembly 20. Compared with the related art in which a plurality of battery packs are arranged in a stacked manner, the above battery box omits the bottom plate and the top plate of the spliced box 12, which is conducive to reducing the overall height of the battery box and reducing the material of the battery box on the basis of the same number of battery cell assemblies 20. Not only can the volume utilization be improved, but also the cost can be reduced.

[0034] In addition, the plurality of spliced boxes 12 form the box body, the number of battery cell assemblies 20 can be selected according to the actual required electric quantity, and the number of spliced boxes 12 to be used can be selected according to the number of battery cell assemblies 20. The total electric quantity of the multi-layer battery system is more flexible to adjust, and different specifications of the battery box do not need to be customized, and the compatibility is better.

[0035] In some embodiments, the plurality of battery cell assemblies 20 are stacked in the battery box without the need for assembly into groups before assembly, which is conducive to improving the volume utilization rate of the battery box.

[0036] Compared with the plurality of stacked battery packs connected by external copper bars in the related art, in the present embodiment, the conductive assembly is arranged in the battery box and does not need to be exposed or additionally increase a protective structure, which is conducive to reducing the cost and improving the reliability of the multi-layer battery system.

[0037] In some embodiments, as shown in FIG. 2, a first sealing glue layer 171 is arranged between the box cover 13 and the spliced box 12 connected thereto, between the adjacent two spliced boxes 12, and between the bottom guard plate 11 and the spliced box 12 connected thereto. Through the first sealing glue layer 171, the spliced box 12 connected to the box cover 13, the adjacent two spliced boxes 12, and the spliced box 12 adjacent to the bottom guard plate 11 can be fixed, and a sealing effect can be achieved, which is simple in structure, good in sealing effect, and conducive to improving the reliability of the multi-layer battery system.

[0038] In order to make the battery box structure more compact, as shown in FIG. 3, in some embodiments, the top end face of the spliced box 12 is provided with a first sealing glue storage groove 125, and the first sealing glue layer 171 is formed by gluing into the first sealing glue storage groove 125, so as to connect the adjacent spliced boxes 12 and the box cover 13.

[0039] In order to form a sealing glue layer between the bottom guard plate 11 and the spliced box 12 adjacent thereto, the bottom end face of the spliced box 12 adjacent to the bottom guard plate 11 is also provided with a first sealing glue storage groove 125 to facilitate glue injection.

[0040] The first sealing glue storage groove 125 is arranged along the circumference of the open top of the spliced box 12 and is a ring-shaped groove. The first sealing glue layer 171 formed by injecting glue into the first sealing glue storage groove 125 is a ring-shaped structure, which forms a seal around the opening and improves the sealing effect.

[0041] In other embodiments, the top end face and the bottom end face of the uppermost spliced box 12 cooperating with the box cover 13 are both provided with the first sealing glue storage groove 125, and the remaining spliced boxes 12 can be provided with the first sealing glue storage groove 125 only at the bottom end face to achieve the sealing of the adjacent structures.

[0042] In other embodiments, the top end face and the bottom end face of each spliced box 12 are provided with the first sealing glue storage groove 125, so that the layer position of each spliced box 12 can be interchangeable, improving the universality.

[0043] In order to better adapt the installation space in the corresponding device, in some embodiments, the uppermost splicing box 12 is a top splicing box, which comprises at least two containing bodies 12a and a connecting plate 12b, the at least two containing bodies 12a are arranged at intervals, each containing body 12a is hollow inside to contain the battery cell assembly 20, and the connecting plate 12b connects the bottom ends of the two adjacent containing bodies 12a, so that the space between the two adjacent containing bodies 12a and the connecting plate 12b is avoided, which can not only avoid other structures in the installation space, but also reduce the specification of the corresponding battery cell assembly 20 in the top splicing box, so that the total power of the multi-layer battery system can be more flexibly adjusted.

[0044] For example, as shown in FIG. 4, the top splicing box comprises two containing bodies 12a and a connecting plate 12b, the two containing bodies 12a are arranged at intervals and connected by the connecting plate 12b, each containing body 12a encloses a cavity, and the cavity is configured to place the battery cell assembly 20. The number of battery cells in the battery cell assemblies 20 in the two cavities can be the same or different.

[0045] The top end surface of each containing body 12a is provided with a first sealant groove 125 to contain a first sealant layer 171, so as to realize the sealing of the top of the containing body 12a.

[0046] In some embodiments, as shown in FIGS. 1 and 4, the box further comprises an electrical box 14, which is arranged between the box cover 13 and the top splicing box. The upper and lower ends of the electrical box 14 are both open, the electrical box 14 is in communication with the adjacent splicing box 12 below, and the top opening of the electrical box 14 is shielded by the box cover 13. By arranging the electrical box 14, the battery pack disconnection unit (BDU) and the battery management system (BMS) and other electrical devices can be contained, so that the electrical devices are separated from the battery cell assembly 20, and the safety in use is ensured.

[0047] In some embodiments, as shown in FIG. 4, the electrical box 14 comprises a shielding plate 141 and an annular side wall 142 arranged on the shielding plate 141. The shielding plate 141 is provided with a through hole, and the annular side plate is arranged along the circumference of the through hole. The annular side plate encloses a space for containing electrical devices, and the shielding plate 141 is configured to shield the top opening of the containing body 12a.

[0048] In order to realize the sealing of the electrical box 14 and the box cover 13, a third sealant layer 173 is arranged between the top end surface of the electrical box 14 and the box cover 13, so as to realize the sealing of the electrical box 14 and the box cover 13.

[0049] In some embodiments, the top end surface of the electrical box 14 is provided with a third sealant storage groove, and the third sealant storage groove is filled with sealant to form and accommodate a third sealant layer 173.

[0050] It can be understood that the bottom of the electrical box 14 and the accommodating body 12a are sealed by the first sealant layer 171.

[0051] In some embodiments, the multi-layer battery system further comprises a liquid cooling assembly 30 configured to dissipate heat from the battery cell assembly 20. As shown in FIG. 5, the liquid cooling assembly 30 comprises a plurality of first liquid cooling plates 31, and each battery cell assembly 20 is provided with a first liquid cooling plate 31 at the bottom thereof to control the temperature of the battery cell assembly 20 by the coolant in the first liquid cooling plate 31, so as to avoid thermal runaway of the battery cell assembly 20 due to excessive temperature during operation.

[0052] In some embodiments, the first liquid cooling plate 31 can be welded and fixed to the inner bottom end of the spliced box 12 to ensure the stability of the position of the first liquid cooling plate 31, and by providing a plurality of first liquid cooling plates 31, the strength of the battery box can be improved, and the reliability of the multi-layer battery system can be improved.

[0053] In some embodiments, the liquid cooling assembly 30 further comprises a second liquid cooling plate 32, and the second liquid cooling plate 32 is stacked on the top of the uppermost battery cell assembly 20. The second liquid cooling plate 32 can dissipate heat from the uppermost battery cell assembly 20 and dissipate heat from the electrical devices in the upper electrical box 14, so as to control the temperature of the electrical devices and avoid thermal runaway.

[0054] The liquid cooling assembly 30 and the liquid cooling plate are conventional settings in the art, and the structure of the liquid cooling assembly 30 and the liquid cooling plate will not be introduced here.

[0055] In order to improve the stability of the battery box, in some embodiments, the bottom guard plate 11, the box body, the two adjacent spliced boxes 12, and the box cover 13 are all fixedly connected by bolts. In some embodiments, the specification of the bolt can be M5-M8, and the length of the screw rod of the bolt can be 15-50mm.

[0056] In order to ensure safety in use, the battery box is provided with a first accommodating cavity 17 and a second accommodating cavity 16, and the battery cell assembly 20 is located in the first accommodating cavity 17. The conductive assembly comprises a conductive row and a joint structure, the conductive row is laid on the top surface of the battery cell assembly 20 and is electrically connected with the battery cell assembly 20, and the joint structure is arranged in the second accommodating cavity 16 and is configured to connect the conductive rows in series. In addition, the liquid cooling assembly 30 further comprises a pipe joint connected with the first liquid cooling plate 31 and the second liquid cooling plate 32, and the pipe joint is arranged in the second accommodating cavity 16. By arranging the first accommodating cavity 17 and the second accommodating cavity 16, the joint structure and the pipe joint can be separated from the battery cell assembly 20, and the reliability of the multi-layer battery system can be improved.

[0057] As shown in FIG. 4, in some embodiments, the battery box further comprises side covers 15 vertically arranged and detachably connected with the box body respectively, and the side covers 15 and the box body enclose a second accommodating cavity 16. By arranging the side covers 15, the second accommodating cavity 16 can be conveniently opened to maintain the structure in the second accommodating cavity 16.

[0058] In some embodiments, as shown in FIGS. 6 and 7, the spliced box 12 comprises first side plates 121, second side plates 122, frames 124 and partition plates 123. Two first side plates 121 are arranged at intervals; the second side plates 122, the partition plates 123 and the frames 124 are arranged between the two first side plates 121, the second side plates 122 are connected with one end of the two first side plates 121, the frames 124 are connected with the opposite end of the two first side plates 121, and the partition plates 123 are located between the second side plates 122 and the frames 124 and connected with the two first side plates 121 respectively. The two first side plates 121, the second side plates 122 and the partition plates 123 cooperatively enclose a first accommodating cavity 17, the frames 124 are configured to connect the side covers 15, and the partition plates 123, the frames 124, the side covers 15 and the two first side plates 121 enclose a second accommodating cavity 16.

[0059] In order to improve the sealing performance of the battery box, the second sealing glue layers 172 are arranged between the side covers 15 and the box body.

[0060] In some embodiments, as shown in FIG. 8, the second sealing glue layers 172 are annularly arranged between the side covers 15 and each splicing line. The second sealing glue layers 172 extend along the circumferential direction of the frames 124, and the second sealing glue layers 172 can seal and connect each frame 124 with the side cover 15; by arranging a plurality of second sealing glue layers 172, each spliced box 12 and the side cover 15 are individually sealed, and the sealing is more reliable.

[0061] In some embodiments, the second sealing glue layers 172 are arranged on each frame 124 along the circumferential direction, the second sealing glue layers 172 are formed by injecting sealing glue into the second sealing glue grooves 1241, and the side cover 15 and the frame 124 are sealed.

[0062] The battery box provided in the embodiments is sealed by the first sealing glue layers, the second sealing glue layers and the third sealing glue layers, and the waterproof level can reach IPX8.

Claims

1. A battery box, comprising a bottom guard plate (11), a box cover (13), and a box body connected with the bottom guard plate (11) and the box cover (13) respectively, the box body comprising at least two spliced boxes (12) arranged in layers, and the upper and lower ends of the spliced boxes (12) being provided with openings.

2. The battery pack of claim 1, wherein, A first sealing glue layer (171) is arranged between the box cover (13) and the box body, between two adjacent spliced boxes (12), and between the bottom guard plate (11) and the box body.

3. The battery pack of claim 2, wherein, At least one of the top end face and the bottom end face of the spliced box (12) is provided with a first sealing glue storage groove (125) configured to accommodate the first sealing glue layer (171).

4. The battery pack of any one of claims 1-3, wherein, The uppermost spliced box (12) comprises: At least two accommodation bodies (12a) configured to accommodate a battery cell assembly (20) ; A connecting plate (12b) connected with the bottom ends of two adjacent accommodation bodies (12a), and the accommodation bodies (12a) and the connecting plate (12b) cooperatively defining an avoiding space.

5. The battery pack of any one of claims 1-3, wherein, The box body further comprises an electrical box (14) arranged between the box cover (13) and the uppermost spliced box (12), and the electrical box (14) being in communication with the adjacent spliced box (12) below.

6. The battery pack of any one of claims 1-3, wherein, The battery box is provided with a first accommodation cavity (17) and a second accommodation cavity (16), and the first accommodation cavity (17) is configured to accommodate the battery cell assembly (20).

7. The battery pack of claim 6, wherein, The battery box further comprises a side cover (15) vertically arranged and detachably connected with the box body, and the side cover (15) and the box body cooperatively defining the second accommodation cavity (16). An annular second sealing glue layer (172) is arranged between the side cover (15) and each spliced box (12). 8.A multi-layer battery system, comprising: The battery box of any one of claims 1-7; A plurality of battery cell assemblies (20) arranged in layers, and each spliced box (12) being provided with the battery cell assembly (20) ; A conductive assembly arranged in the battery box and configured to electrically connect the plurality of battery cell assemblies (20). 9.The multi-layer battery system of claim 8, further comprising a liquid cooling assembly (30), the liquid cooling assembly (30) comprising: A plurality of first liquid cooling plates (31), and each battery cell assembly (20) being provided with the first liquid cooling plate (31) at the bottom; A second liquid cooling plate (32) provided at the top of the uppermost battery cell assembly (20).

10. The multi-layer battery system of claim 9, wherein, The first liquid cooling plate (31) is welded and fixed with the inner bottom end of the spliced box (12).

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