Battery box and multilayer battery system

Abstract

The utility model belongs to the technical field of power batteries, and discloses a battery box and a multilayer battery system. The multi-layer battery system comprises a battery box, a conductive assembly and a plurality of battery cell assemblies, the battery box comprises a bottom protection plate, a box cover and a box body connected with the bottom protection plate and the box cover, the box body comprises at least two splicing boxes which are arranged in a stacked mode, and the upper end and the lower end of each splicing box are each provided with an opening; the plurality of battery cell assemblies are arranged in a stacked manner, and the battery cell assembly is arranged in each splicing box; and the conductive assembly is arranged in the battery box and is used for electrically connecting the plurality of battery cell assemblies. Compared with the prior art in which a plurality of battery packs are stacked, the battery box has the advantages that a bottom plate and a top plate of each battery pack are omitted, so that the overall height of the battery box and the material of the battery box are reduced on the basis that the number of the battery cell components is not changed, the volume utilization rate can be improved, and the cost can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field especially, relates to a battery box and multilayer battery system. BACKGROUND

[0002] With the development of power battery, the application of power battery is more and more extensive. At present, only one layer of battery core is arranged in battery pack, when the power needs to be increased for logistics vehicle, bus or some energy storage projects, multiple battery packs can only be stacked and copper bars are added outside for series and parallel connection. This kind of mode needs to additionally increase frame and connecting structure, and is inconvenient to assemble, low in efficiency, high in cost, low in volume utilization and large in occupied space. UTILITY MODEL CONTENTS

[0003] The utility model aims at providing a battery box and multilayer battery system, which can solve the problems of high cost, inconvenient assembly and low volume utilization of multiple battery packs stacked to form a large capacity battery.

[0004] To achieve the purpose, the utility model adopts the following technical scheme:

[0005] A battery box comprises:

[0006] 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.

[0007] As an optional scheme of the above battery box, a first sealing glue layer is arranged between the box cover and the box body, between two adjacent spliced boxes and between the bottom guard plate and the box body.

[0008] As an optional scheme of the above battery box, the top end face and / or the bottom end face of the spliced box is provided with a first sealing glue groove for accommodating the first sealing glue layer.

[0009] As an optional scheme of the above battery box, the uppermost spliced box comprises:

[0010] At least two accommodating bodies are arranged in the accommodating body for accommodating a battery core assembly.

[0011] A connecting plate is arranged at the bottom end of two adjacent accommodating bodies, and the accommodating bodies and the connecting plate cooperatively form an avoiding space.

[0012] As an optional scheme of the above battery box, the box body further comprises an electrical box arranged between the box cover and the uppermost spliced box, and the electrical box is communicated with the adjacent spliced box below.

[0013] As an optional solution of the above battery box, the battery box is provided with a first accommodating cavity and a second accommodating cavity, and the first accommodating cavity is used for accommodating the battery cell assembly.

[0014] As an optional solution of the above multi-layer battery system, the battery box further comprises a side cover vertically arranged and detachably connected with the box body, and the side cover and the box body enclose the second accommodating cavity.

[0015] The side cover and each splicing box are provided with an annular second sealing rubber layer.

[0016] A multi-layer battery system comprises:

[0017] The above battery box;

[0018] A plurality of battery cell assemblies are arranged in layers, and each splicing box is provided with the battery cell assembly;

[0019] A conductive assembly is arranged in the battery box, and the conductive assembly is used for electrically connecting the plurality of battery cell assemblies.

[0020] As an optional solution of the above multi-layer battery system, the multi-layer battery system further comprises a liquid cooling assembly, and the liquid cooling assembly comprises:

[0021] A plurality of first liquid cooling plates are arranged at the bottom of each battery cell assembly;

[0022] A second liquid cooling plate is arranged at the top of the uppermost battery cell assembly.

[0023] As an optional solution of the above multi-layer battery system, the first liquid cooling plate is welded and fixed to the inner bottom end of the splicing box.

[0024] The beneficial effects of the utility model are as follows:

[0025] In the battery box, the upper and lower ends of the splicing box are provided with openings, and the box body is composed of at least two splicing boxes, compared with the prior art of stacking a plurality of battery packs, the above battery box saves the bottom plate and the top plate of each battery pack, which 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, which not only improves the volume utilization rate, but also reduces the cost.

[0026] The plurality of splicing boxes form the box body, the number of battery cell assemblies can be selected according to the actual required power, and the number of splicing boxes to be used can be selected according to the number of battery cell assemblies, so that 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.

[0027] The multi-layer battery system provided by the utility model has high volume utilization rate and is favorable for reducing cost. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the first structure schematic view of the multi-layer battery system provided by the utility model;

[0029] Figure 2 is the first structure schematic view of the splicing box provided by the utility model;

[0030] Figure 3 is the first structure schematic view of the splicing box provided by the utility model;

[0031] Figure 4 is the second structure schematic view of the multi-layer battery system provided by the utility model;

[0032] Figure 5 is the sectional view of the multi-layer battery system provided by the utility model;

[0033] Figure 6 is the second structure schematic view of the splicing box provided by the utility model;

[0034] Figure 7 is the structure schematic view of the multi-layer battery system when not assembling the side cover and the box cover provided by the utility model;

[0035] Figure 8 is the distribution diagram of the first sealing glue layer, the second sealing glue layer and the third sealing glue layer provided by the utility model.

[0036] In the drawings:

[0037] 11, bottom guard plate; 12, splicing box; 12a, containing main 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; 171, first sealing glue layer; 172, second sealing glue layer; 173, third sealing glue layer; 20, electric core assembly; 30, liquid cooling assembly; 31, first liquid cooling plate; 32, second liquid cooling plate. DETAILED DESCRIPTION

[0038] The utility model will be further explained in detail in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that in order to facilitate the description, only part of the structure related to the utility model is shown in the drawings, not all the structures.

[0039] In the description of the utility model, unless another explicit provision and limitation, the term "connected", "connection", "fixed" should be broad sense understanding, for example, can be fixed connection, can also be detachable connection, or integrated;Can be mechanical connection, can also be electrical connection;Can be directly connected, can also be indirectly connected through the intermediate medium, can be two elements inside the communication or the interaction relationship of two elements.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] In the utility model, unless another explicit provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features directly contact, can also include the first and second features are not directly contact but contact through another feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0041] In the description of the embodiment, the terms "up", "down", "right", etc. The orientation or position relationship shown in the drawing is based on the orientation or position relationship, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0042] The embodiment provides a kind of multi-layer battery system, and electric quantity is big, can satisfy power demand.As shown in Figure 1 The multi-layer battery system includes a battery box and a plurality of battery cell assemblies 20 and a conductive assembly disposed in the battery box, the plurality of battery cell assemblies 20 are stacked along the vertical direction, and the conductive assembly is used to electrically connect the plurality of battery cell assemblies 20 to realize the series connection of the plurality of battery cell assemblies 20, thereby increasing the electric quantity.

[0043] In the prior art, in order to ensure large electric quantity, a plurality of battery packs are generally stacked, and a copper bar is provided outside to connect the plurality of battery packs, which not only requires 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.

[0044] To solve the above problems, 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 used to shield the opening at the bottom end of the box body, the box cover 13 is connected with the top end of the box body and is used to shield the opening at the top end of the box body, wherein the box body comprises at least two spliced boxes 12 arranged in layers, each splicing line is provided with 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 prior art in which a plurality of battery packs are stacked, the above battery box eliminates 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 number of battery cell assemblies 20 being unchanged, thereby improving the volume utilization rate and reducing the cost.

[0045] 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 power, and the number of spliced boxes 12 used can be selected according to the number of battery cell assemblies 20, so that the total power 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.

[0046] In some embodiments, the plurality of battery cell assemblies 20 are arranged in layers in the box body without the need for assembly into groups before assembly, which is conducive to improving the volume utilization rate of the battery box.

[0047] Compared with the prior art in which a plurality of stacked battery packs are connected by external copper bars, in the embodiment, the conductive assembly is arranged in the battery box and does not need to be exposed, and does not need to be additionally protected, which is conducive to reducing the cost and improving the reliability of the multi-layer battery system.

[0048] In some embodiments, as shown in Figure 2 The first sealing glue layer 171 is arranged between the box cover 13 and the spliced box 12 connected therewith, between the adjacent two spliced boxes 12, and between the bottom guard plate 11 and the spliced box 12 connected therewith. Through the first sealing glue layer 171, the box cover 13, the adjacent two spliced boxes 12 and the bottom guard plate 11 and the adjacent spliced box 12 connected therewith can be fixed, and the sealing effect is good, the structure is simple, and the reliability of the multi-layer battery system is improved.

[0049] In order to make the structure of the battery box more compact, as shown in Figure 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.

[0050] In order to form a sealing glue layer between the bottom guard plate 11 and the adjacent splicing box 12, the bottom end face of the splicing box 12 adjacent to the bottom guard plate 11 is also provided with a first sealing glue storage groove 125 to facilitate glue injection.

[0051] It should be noted that the first sealing glue storage groove 125 is arranged along the circumference of the open top of the splicing box 12 and is annular. The first sealing glue layer 171 formed by injecting glue into the first sealing glue storage groove 125 is annular, thereby forming a seal around the opening and improving the sealing effect.

[0052] In other embodiments, the top end face and the bottom end face of the uppermost splicing box 12 matched with the box cover 13 are both provided with the first sealing glue storage groove 125, and the remaining splicing boxes 12 can be provided with the first sealing glue storage groove 125 only at the bottom end face to achieve the sealing of adjacent structures.

[0053] In other embodiments, the top end face and the bottom end face of each splicing box 12 are both provided with the first sealing glue storage groove 125, so that the layer position of each splicing box 12 can be interchanged to improve the versatility.

[0054] In order to better adapt the multi-layer battery system to the installation space in the corresponding device, in some embodiments, the uppermost splicing box 12 is a top splicing box, which includes at least two containing bodies 12a and a connecting plate 12b. The at least two containing bodies 12a are arranged at intervals, and each containing body 12a is hollow inside to contain the battery cell assembly 20. The connecting plate 12b connects the bottom ends of the two adjacent containing bodies 12a, so that the avoiding space is formed between the two adjacent containing bodies 12a and the connecting plate 12b. On the one hand, the avoiding space can avoid other structures in the installation space, and on the other hand, it can reduce the specifications of the corresponding battery cell assembly 20 in the top splicing box, thereby more flexibly adjusting the total power of the multi-layer battery system.

[0055] Exemplarily, as shown in Figure 4 The top splicing box includes two containing bodies 12a and one 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 for placing 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.

[0056] It should be noted that the top end face of each containing body 12a is provided with the first sealing glue storage groove 125 to accommodate the first sealing glue layer 171, thereby achieving the sealing of the top of the containing body 12a.

[0057] In some embodiments, in combination with Figure 1 and Figure 4As shown, the box further comprises an electrical box 14, which is arranged between the box cover 13 and the top spliced box, and both upper and lower ends of the electrical box 14 are open. The electrical box 14 is in communication with the adjacent spliced 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 electrical devices such as the battery disconnection unit (BDU) and the battery management system (BMS) can be accommodated, so as to separate the electrical devices from the battery cell assembly 20 and ensure safety in use.

[0058] In some embodiments, as shown in Figure 4 As shown, 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 wall is arranged along the circumference of the through hole. The annular side wall encloses a space for accommodating electrical devices, and the shielding plate 141 is used to shield the top opening of the accommodation body 12a.

[0059] To realize the sealing of the electrical box 14 and the box cover 13, a third sealing glue layer 173 is arranged between the top end face of the electrical box 14 and the box cover 13 to realize the sealing of the electrical box 14 and the box cover 13.

[0060] Optionally, the top end face of the electrical box 14 is provided with a third sealing glue storage groove, and the third sealing glue layer 173 is formed and accommodated by glue injection through the third sealing glue storage groove.

[0061] It can be understood that the bottom of the electrical box 14 is sealed with the accommodation body 12a through the first sealing glue layer 171.

[0062] In some embodiments, the multi-layer battery system further comprises a liquid cooling assembly 30 for heat dissipation of the battery cell assembly 20. As shown in Figure 5 As shown, 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 to control the temperature of the battery cell assembly 20 through the refrigerant in the first liquid cooling plate 31, so as to avoid thermal runaway due to excessive temperature of the battery cell assembly 20 during operation.

[0063] In some embodiments, the first liquid cooling plate 31 can be welded and fixed with 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 arranging 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.

[0064] In some embodiments, the liquid cooling assembly 30 further comprises a second liquid cooling plate 32, which 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.

[0065] It should be noted that the liquid cooling assembly 30 and the liquid cooling plate are conventional in the art, and the structure of the liquid cooling assembly 30 and the liquid cooling plate will not be described in detail here.

[0066] In order to improve the stability of the battery box, in some embodiments, the bottom guard plate 11 is fixedly connected to the box body, the adjacent two spliced boxes 12, and the box cover 13 is fixedly connected to the box body by bolts. Optionally, the specification of the bolt can be M5-M8, and the length of the screw rod of the bolt can be 15-50mm.

[0067] In order to ensure safety in use, the battery box is provided with a first accommodating cavity and a second accommodating cavity 16, and the battery cell assembly 20 is located in the first accommodating cavity. 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 to the battery cell assembly 20, and the joint structure is arranged in the second accommodating cavity 16. The joint structure is used 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 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.

[0068] As shown in Figure 4 In some embodiments, the battery box further comprises a side cover 15, which is vertically arranged and detachably connected to the box body, and the side cover 15 and the box body form the second accommodating cavity 16. By arranging the side cover 15, the second accommodating cavity 16 can be easily opened for maintenance of the structure in the second accommodating cavity 16.

[0069] In some embodiments, as shown in Figure 6 and Figure 7As shown, the spliced box 12 comprises a first side plate 121, a second side plate 122, a frame 124 and a partition plate 123. The first side plate 121 is provided with two and arranged at intervals; the second side plate 122, the partition plate 123 and the frame 124 are all arranged between the two first side plates 121, the second side plate 122 is connected with one end of the two first side plates 121, the frame 124 is connected with the opposite end of the two first side plates 121, and the partition plate 123 is located between the second side plate 122 and the frame 124 and connected with the two first side plates 121 respectively. Among them, the two first side plates 121, the second side plate 122 and the partition plate 123 cooperate to form a first containing cavity, and the frame 124 is used for connecting the side cover 15, and the second containing cavity 16 is formed between the partition plate 123, the frame 124, the side cover 15 and the two first side plates 121.

[0070] In order to improve the sealing performance of the battery box, the second sealing glue layer 172 is arranged between the side cover 15 and the box body.

[0071] In some embodiments, as shown in the drawings, Figure 8 As shown, the second sealing glue layer 172 is arranged between the side cover 15 and each splicing line. Specifically, the second sealing glue layer 172 extends along the circumference of the frame 124, and the second sealing glue layer 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.

[0072] Optionally, the second sealing glue groove 1241 is arranged on each frame 124 along the circumference, and the second sealing glue layer 172 is formed by injecting sealing glue into the second sealing glue groove 1241, and the side cover 15 and the frame 124 are sealed.

[0073] The battery box provided in the embodiment is sealed by a plurality of first sealing glue layers, second sealing glue layers and third sealing glue layers, and the waterproof level can reach IPX8.

[0074] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.

Claims

1. A battery box characterized by, The battery box comprises a bottom protection plate (11), a box cover (13), and a box body connected with the bottom protection plate (11) and the box cover (13) respectively, wherein the box body comprises at least two spliced boxes (12) arranged in layers, and the upper and lower ends of the spliced boxes (12) are both 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 protection plate (11) and the box body.

3. The battery pack of claim 2, wherein, The top end face and / or the bottom end face of the spliced box (12) is provided with a first sealing glue storage groove (125) for accommodating the first sealing glue layer (171).

4. The battery box according to any one of claims 1 to 3, characterized in that, The uppermost spliced box (12) comprises: At least two accommodating bodies (12a) for accommodating an electric core assembly (20); A connecting plate (12b) connected with the bottom ends of two adjacent accommodating bodies (12a), and the accommodating bodies (12a) and the connecting plate (12b) cooperatively define an avoiding space.

5. The battery box according to any one of claims 1 to 3, characterized in that, 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) is in communication with the lower adjacent spliced box (12).

6. The battery box according to any one of claims 1 to 3, characterized in that, The battery box is provided with a first accommodating cavity and a second accommodating cavity (16), and the first accommodating cavity is used for accommodating the electric core 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 define the second accommodating 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, characterized by, The battery box comprises: The battery box according to any one of claims 1-7; A plurality of electric core assemblies (20) arranged in layers, and each spliced box (12) is provided with the electric core assembly (20); An electrically conductive assembly arranged in the battery box, and the electrically conductive assembly is used for electrically connecting the plurality of electric core assemblies (20).

9. The multi-layer battery system of claim 8, wherein, The multi-layer battery system further comprises a liquid cooling assembly (30), and the liquid cooling assembly (30) comprises: A plurality of first liquid cooling plates (31), and the bottom of each electric core assembly (20) is provided with the first liquid cooling plate (31); A second liquid cooling plate (32) arranged at the top of the uppermost electric core 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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