Battery pack, battery system and vehicle

Abstract

The utility model provides a battery pack, a battery system and a vehicle. The battery pack comprises a top cover plate and a plurality of battery units, the battery unit comprises a box body and a battery cell module arranged in the box body, and the box body comprises a bottom plate and a circumferential side plate connected with the bottom plate; the plurality of battery units are stacked and connected, so that the bottom plate of the upper-layer box body in every two adjacent battery units covers the top opening of the lower-layer box body; and the top cover plate covers the top opening of the box body of the uppermost layer of battery unit. According to the battery pack provided by the invention, the battery module is highly protected, and the connecting frame does not need to be provided with a wall plate, so that the total quantity of a battery system is reduced, the battery system can be conveniently arranged on equipment such as a vehicle, and meanwhile, the battery pack and the connecting frame can be conveniently and quickly disassembled and assembled, the assembling operation is simple and convenient, and the battery module is maintained, replaced and the like in the later period.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery pack, a battery system, and a vehicle. Background Technology

[0002] The application of new energy batteries in vehicles and other types of mechanical equipment is becoming increasingly widespread. The performance of battery systems, including weight, protection, and ease of assembly and disassembly, also needs to be improved. Currently, for pure electric vehicles, the required battery packs are large and need to be fixed to the chassis using connecting frames. Standard battery packs are used. However, because the outer shell of the standard pack is relatively thin, its impact resistance and other protective performance are insufficient when used on the chassis. Therefore, current connecting frames are usually box-shaped structures, requiring not only a robust frame but also wall panels to cover the standard pack to meet protection requirements. However, this also results in a large overall weight of the battery system, cumbersome assembly and disassembly of the battery pack, and inconvenience for maintenance and replacement. Utility Model Content

[0003] In view of this, the present application aims to provide a battery pack that provides high protection for the battery module, eliminates the need for a wall panel on the connector, thereby reducing the overall size of the battery system for easy installation on vehicles and other equipment. At the same time, it also facilitates quick assembly and disassembly of the connector, simplifying assembly operations and subsequent maintenance and replacement of the battery module, thus at least partially solving the aforementioned problems.

[0004] This application provides a battery pack, including a top cover and multiple battery cells;

[0005] The battery unit includes a housing and a cell module disposed within the housing. The housing includes a bottom plate and circumferential side plates connected to the bottom plate.

[0006] Multiple battery cells are stacked and connected to each other, such that the bottom plate of the upper housing in each pair of adjacent battery cells covers the top opening of the lower housing.

[0007] The top cover plate seals the top opening of the housing of the uppermost battery unit.

[0008] In one possible implementation, the base plate is a liquid-cooled plate, the bottom of the circumferential side plate is provided with an overlapping connection portion and surrounds a hollow area, the base plate is laid on the hollow area and connected to the overlapping connection portion, and / or, the circumferential side plate is an integral structure.

[0009] In one possible implementation, the base plate is a liquid-cooled plate and includes a first plate body and a second plate body. The first plate body or the second plate body has protrusions protruding from the plate body and recesses located between the protrusions. The first plate body and the second plate body are fastened together and the recesses form a flow channel for coolant to flow through.

[0010] In one possible implementation, a connecting rod is also included, which sequentially passes through the stacked layers of the housing to connect the battery cells together.

[0011] In one possible implementation, the circumferential side plate includes a plate body and a lug protruding from the plate body, the lug having a first connecting hole through which the connecting rod passes.

[0012] In one possible implementation, the top cover plate is provided with a second connecting hole through which the connecting rod passes, the connecting rod connecting the top cover plate and each layer of the box together.

[0013] In one possible implementation, a sealing structure is provided between the housings of each pair of adjacent battery cells;

[0014] And / or, the top of the circumferential side panel of the enclosure is provided with a positioning and docking structure that is aligned with the bottom plate of any other enclosure.

[0015] In one possible implementation, the top of the circumferential side plate is provided with a protruding edge plate that protrudes from one side of the plate body, and the protruding edge plate is arranged at intervals or extends around the circumference of the circumferential side plate.

[0016] And / or, a sealing strip is provided on the top surface of the circumferential side plate, which is arranged circumferentially along the circumferential side plate;

[0017] And / or, a portion of the circumferential side plate is recessed toward the battery module and forms an avoidance groove on the outer wall of the housing, wherein a through hole for connecting the battery module is provided on the groove wall of the avoidance groove.

[0018] This application also provides a battery system including a battery pack and a mounting bracket for securing the battery pack, wherein the battery pack is as described in any of the preceding claims.

[0019] This application also provides a vehicle, including a vehicle body on which a battery pack as described in any of the preceding claims is disposed.

[0020] The battery pack provided in this application stacks battery modules in layers, with each layer of battery modules wrapped in a housing. Each housing has a bottom plate and circumferential side plates. In addition, after stacking, the bottom plate of the upper housing can cover the opening of the lower housing, which is equivalent to the top plate of the lower housing. In this way, a series of tightly wrapped battery units are formed, providing comprehensive protection for each layer of battery modules. This structural design improves the protection of the battery module. By setting an appropriate housing thickness, the need for wall panels on the connecting frame to protect the battery module can be eliminated. This allows the connecting frame to serve only a supporting and fixing function, such as simply being a frame structure. The battery pack can be directly fixed to the connecting frame with fasteners, making disassembly and assembly simple and easy to perform installation, maintenance, and replacement operations. Furthermore, since there is no need for wall panels on the connecting frame, it can be said that the wall panels on the connecting frame are integrated into the battery pack. Through structural simplification and increased integration, the composition of the battery system is simplified. This not only simplifies the composition structure and facilitates disassembly and assembly operations but also reduces the overall weight of the battery system, which is beneficial for its application in vehicles and improves the vehicle's range. Attached Figure Description

[0021] Figure 1 The diagram shown is a schematic representation of the battery pack composition in an embodiment of this application.

[0022] Figure 2 The image shown is an overall schematic diagram of the battery pack in an embodiment of this application;

[0023] Figure 3 The diagram shown is a schematic diagram of the battery cell in an embodiment of this application;

[0024] Figure 4 The diagram shown is a structural schematic of the box in an embodiment of this application;

[0025] Figure 5 The diagram shown is a schematic diagram of the sealing strip configuration in an embodiment of this application.

[0026] Figures 1-5 middle:

[0027] 1. Top cover plate; 2. Box body; 21. Circumferential side plate; 211. Lug block; 212. Lug plate; 213. Clearance groove; 22. Bottom plate; 214. Overlapping connection part; 24. Sealing strip; 3. Battery module; 4. Connecting rod. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Please refer to the attached document. Figure 1-4 This application provides a battery pack comprising a top cover plate 1 and multiple battery units. Each battery unit includes a housing 2 and a cell module disposed within the housing 2. The housing 2 includes a bottom plate 22 and a circumferential side plate 21 connected to the bottom plate 22. The circumferential side plate 21 surrounds the cell module circumferentially. Multiple battery units are stacked and connected to each other, i.e., multiple housings 2 are stacked sequentially and connected together, such that the bottom plate 22 of the upper housing 2 covers the top opening of the lower housing 2 in every two adjacent battery units, i.e., the bottom plate 22 of the upper housing 2 is equivalent to the top plate of the lower housing 2. The top cover plate 1 is connected to the uppermost housing 2, covering the top opening of the uppermost housing 2. With this configuration, the battery modules 3 are stacked in layers, and each layer of battery module 3 has its own dedicated housing 2 that fully encloses it. This provides high protection for the battery modules 3, and overall, the battery pack has a stable housing structure with high structural strength, effectively improving its impact resistance, corrosion resistance, dust and water resistance, etc.

[0030] Furthermore, the battery pack provided in this application not only improves its own protective performance and enhances the protection of the battery module 3, but also improves the stability of use. When the battery pack is used as a power battery in a vehicle, only an appropriate thickness of the housing 2 is needed to eliminate the need to install a wall panel on the connecting frame to protect the battery module 3. This allows the connecting frame to only play a supporting and fixing role. For example, the connecting frame is only a frame structure. The battery pack can be directly fixed to the connecting frame with fasteners to complete the assembly operation on the vehicle body. The disassembly and assembly operation is simple and easy to perform installation, maintenance and replacement operations.

[0031] Meanwhile, the multi-layered housing 2 is stacked, with each pair of adjacent battery modules 3 sharing a base plate 22. This enhances protective performance while simplifying the structure and reducing the overall weight of the battery pack. Furthermore, due to the structure of this battery pack, there is no need to install wall panels on the connecting frame. In essence, the wall panels on the connecting frame are integrated into the battery pack. Through structural simplification and increased integration, the composition of the battery system is simplified (compared to the standard pack and connecting frame with wall panels in the prior art, the entire battery system has only one housing wall). Thus, for a battery system including both the battery pack and the connecting frame, not only is the composition structure simplified, but the assembly and disassembly of the battery system are also simplified (both the assembly of the battery pack to the connecting frame and the assembly of the connecting frame are simplified). It also reduces the overall weight of the battery system, making it easier to apply to vehicles and improve the range of electric vehicles.

[0032] Furthermore, in some embodiments, the base plate 22 is a liquid-cooled plate. In this way, the housing 2 does not need to be provided with an additional base plate support plate. The liquid-cooled plate is used as the base plate 22, which can both protect the battery module 3 and effectively cool the battery module 3. Since the top and bottom of each layer of battery module 3 are covered with the base plate 22, and the liquid-cooled plate is used directly as the base plate 22, or in other words, the base plate 22 is directly set as the liquid-cooled plate, each layer of battery module 3 can contact the two layers of liquid-cooled plates, and the top and bottom are in contact with the liquid-cooled plates for heat exchange, resulting in a significant cooling effect.

[0033] The base plate 22 may specifically include a first plate and a second plate, either of which is provided with a flow channel structure, that is, has a recess extending on the plate. The first plate and the second plate are fastened together and the recess forms a flow channel for coolant to flow through.

[0034] The circumferential side panel 21 can be a one-piece structure, i.e., a one-piece construction, such as a casting. In this way, not only can the overall structural strength of the circumferential side panel 21 and the housing 2 be enhanced, but the circumferential side panel 21 does not require assembly, which further simplifies the disassembly and assembly of the battery pack and makes it easier to repair and replace each battery module 3; it can also enhance the sealing performance of the housing 2 and improve its waterproof performance.

[0035] like Figure 4 As shown, the bottom of the circumferential side plate 21 is provided with an overlapping connection portion 214, which encloses a hollow area. The base plate 22 is laid on the hollow area and connected to the overlapping connection portion 214. The base plate 22 can be connected to the overlapping connection portion 214 by fasteners or by welding. The overlapping connection portion 214 includes an inner protruding edge located at the bottom of the circumferential side plate 21, and a connecting plate connecting two opposing side plates in the circumferential side plate 21. The connecting plate divides the bottom of the space enclosed by the circumferential side plate 21 into two hollow areas. The base plate 22 includes two separately arranged liquid cooling plates, which are respectively laid on the two hollow areas and connected to the connecting plate and other inner protruding edges. The two sides of the connecting plate in the width direction are used to connect with the liquid cooling plates, and the middle has a wiring groove.

[0036] The battery pack consists of multiple layers of battery cells stacked sequentially. Each layer of the housing 2 can be connected to the others in pairs. Alternatively, in some embodiments, the battery pack also includes connecting rods 4. Each housing 2 has a first connecting hole through which the connecting rods 4 pass. The connecting rods 4 sequentially connect the stacked housings 2 to connect the battery cells together. This further simplifies the structure and simplifies assembly and disassembly: after stacking each layer of battery cells, all battery cells are directly connected via the connecting rods 4 (specifically, screws), and then the entire battery pack is assembled by tightening the ends of the connecting rods 4. When the battery modules 3 need repair or replacement, the connecting rods 4 can be pulled out to disassemble the battery modules 3, making the operation very simple.

[0037] Furthermore, the top cover plate 1 is provided with a second connecting hole for the connecting rod 4 to pass through, and the connecting rod 4 connects the top cover plate 1 and each layer of the box 2 together. In this way, the top cover plate 1 and each layer of the box 2 can be assembled and disassembled together without additional disassembly and assembly, further simplifying the structure and making disassembly and assembly operations easier.

[0038] To enhance the structural strength of the housing 2, reinforcing ribs may be provided on the circumferential side plates 21 and the bottom plate 22. In some embodiments provided in this application, lugs 211 may be provided on the circumferential side plates 21, such as... Figure 3 As shown, the circumferential side plate 21 includes a plate body and a lug block 211 protruding from the plate body. The lug block 211 is provided with a first connecting hole for the connecting rod 4 to pass through. The lug block 211 is equivalent to a reinforcing block, which can not only enhance the structural strength of the box body 2, but also enhance the connection strength between the boxes body 2 and the overall fastening strength of the battery pack by setting the first connecting hole on the lug block 211. At the same time, it can enhance the support and stability of the upper battery unit when the battery units are stacked and aligned.

[0039] like Figure 3 As shown, the bottom of the circumferential side plate 21 is connected to the bottom plate 22, and a raised edge plate 212 may be provided on the top. The raised edge plate 212 protrudes from one side of the circumferential side plate 21 and can be distributed at intervals along the circumference of the circumferential side plate 21, or it can be arranged around the entire circumference of the circumferential side plate 21. In this way, the stacking alignment with the upper housing 2 and the support stability of the upper battery unit can be enhanced.

[0040] Alternatively, in some embodiments, the top of the circumferential side plate 21 of the housing 2 may be provided with a positioning and docking structure that aligns with the bottom plate 22 of any other housing 2. This enhances the alignment of the stacked battery cells, improving assembly quality and ease of assembly. Specifically, the positioning and docking structure may include an annular protrusion on the bottom plate 22, which is used to insert into the housing space, or the annular protrusion forms a groove for the circumferential side plate 21 to be inserted into, and the sidewall of the annular protrusion facing the circumferential side plate 21 abuts against the side plate of the circumferential side plate 21; or, the positioning and docking structure may specifically include a docking groove on one of the bottom plate 22 and the circumferential side plate 21, and a docking protrusion on the other for insertion into the annular groove, with the docking protrusion arranged around the circumference of the annular side plate or spaced apart.

[0041] If the battery pack is used in a vehicle, since it is installed in the vehicle chassis, there will be certain requirements for waterproofing.

[0042] Specifically, when the base plate 22 and the circumferential side plate 21 are sealed together, such as when the base plate 22 and the circumferential side plate 21 are an integral structure, welded, or sealed together by setting a sealing element, the top cover plate 1 and the uppermost box 2 are sealed together by a sealing element. A sealing structure such as a sealing strip 24 is set between each two adjacent stacked boxes 2, which can effectively enhance the sealing performance of the box 2, improve the water protection of the battery module 3, and improve the waterproof performance of the battery pack.

[0043] like Figure 3 As shown, a sealing strip 24 extending circumferentially along the top surface of the circumferential side plate 21 is provided. Each pair of adjacent stacked boxes 2 can be sealed by compressing the sealing strip 24. The top cover plate 1, after being securely connected to the uppermost box 2, can also be sealed to the box 2 by compressing the sealing strip 24. With this configuration, each box 2 has the same structure, allowing for arbitrary matching of battery modules 3 and box 2 during battery pack assembly. Any box 2 can be placed on top, simplifying production and assembly operations.

[0044] Of course, the sealing strip 24 can also be located on the bottom surface of the base plate 22, such as in the area of ​​the bottom surface of the base plate 22 that abuts against the top surface of the circumferential side plate 21. Alternatively, when the base plate 22 is provided with an annular protrusion for insertion into the internal space of the box, the sealing strip 24 can be located on the side wall of the annular protrusion and abut against the side wall of the circumferential side plate 21. Alternatively, when one of the base plate 22 and the circumferential side plate 21 is provided with an annular groove and the other is provided with an annular protrusion for insertion into the annular groove, the sealing strip 24 can be located in the annular groove and abut against the annular protrusion. In these cases, the inner plate surface of the top cover plate 1 facing the battery module 3 also needs to be provided with a sealing strip 24 for sealing connection with the uppermost box 2. In this way, while achieving effective sealing, the structures of each box 2 can also be made consistent.

[0045] like Figure 4 As shown, in some embodiments, a portion of the circumferential side plate 21 is recessed towards the battery module 3 to form a clearance groove 213 on the outer wall of the housing 2. The groove wall of the clearance groove 213, for example, the side wall, is provided with a through hole for connecting the battery module 3. With this configuration, the clearance groove 213 can accommodate the portion of the wiring connecting the battery module 3 located outside the housing 2, such as connectors, thus protecting the wiring outside the housing 2. Simultaneously, the clearance groove 213 also provides operating space for wiring connection operations. For example, after placing each layer of housing 2 units on the connecting frame, the clearance groove 213 facilitates the operator's wiring connection operations between the battery modules 3 outside the housing 2.

[0046] Embodiments of this application also provide a battery system including a battery pack and a connecting frame for securing the battery pack, wherein the battery pack is the type described in any of the foregoing embodiments. The connecting frame is used to secure the battery pack and to connect to a device, such as a vehicle, on which the battery pack is mounted, to assemble the battery pack onto the device.

[0047] Embodiments of this application also provide a vehicle, including a vehicle body, on which a battery pack as described in any of the preceding embodiments is disposed, or, alternatively, the aforementioned battery system is disposed.

[0048] The battery system and vehicle including the battery pack have the structure and beneficial effects described in the above embodiments, which will not be repeated here.

[0049] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0050] The components and devices described in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the accompanying drawings. As those skilled in the art will recognize, these components and devices can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the words “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0051] It should also be noted that in the apparatus of this application, the components can be disassembled and / or reassembled. These disassemblies and / or reassemblies should be considered as equivalent solutions of this application.

[0052] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0053] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, Includes a top cover and multiple battery cells; The battery unit includes a housing and a battery module disposed within the housing. The housing includes a bottom plate and circumferential side plates connected to the bottom plate. Multiple battery cells are stacked and connected to each other, such that the bottom plate of the upper housing in each pair of adjacent battery cells covers the top opening of the lower housing. The top cover plate seals the top opening of the housing of the uppermost battery unit.

2. The battery pack as described in claim 1, characterized in that, The base plate is a liquid-cooled plate, and the bottom of the circumferential side plate is provided with an overlapping connection part to form a hollow area. The base plate is laid on the hollow area and connected to the overlapping connection part; and / or, the circumferential side plate is an integral structure.

3. The battery pack as described in claim 1, characterized in that, The base plate is a liquid-cooled plate and includes a first plate body and a second plate body. The first plate body or the second plate body has a recessed portion. The first plate body and the second plate body are fastened together and the recessed portion forms a flow channel for the coolant to flow through.

4. The battery pack as described in claim 1, characterized in that, It also includes connecting rods that sequentially connect the stacked layers of the housing to connect the battery cells together.

5. The battery pack as described in claim 4, characterized in that, The circumferential side plate includes a plate body and a lug block protruding from the plate body, and the lug block is provided with a first connecting hole for the connecting rod to pass through.

6. The battery pack as described in claim 4, characterized in that, The top cover plate is provided with a second connecting hole for the connecting rod to pass through, and the connecting rod connects the top cover plate and each layer of the box together.

7. The battery pack as described in claim 1, characterized in that, A sealing structure is provided between the housings of each pair of adjacent battery cells; And / or, the top of the circumferential side panel of the enclosure is provided with a positioning and docking structure that is aligned with the bottom plate of any other enclosure.

8. The battery pack as claimed in claim 1, characterized in that, The top of the circumferential side plate is provided with a protruding edge plate that protrudes from one side of the plate body, and the protruding edge plate is arranged at intervals or extends around the circumference of the circumferential side plate. And / or, a sealing strip is provided on the top surface of the circumferential side plate, which is arranged circumferentially along the circumferential side plate; And / or, a portion of the circumferential side plate is recessed toward the battery module and forms an avoidance groove on the outer wall of the housing, wherein a through hole for connecting the battery module is provided on the groove wall of the avoidance groove.

9. A battery system, characterized in that, It includes a battery pack and a connecting frame for securing the battery pack, wherein the battery pack is the battery pack according to any one of claims 1-8.

10. A vehicle, characterized in that, The vehicle includes a vehicle body on which a battery pack according to any one of claims 1-8 is disposed.

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