Battery pack and battery module

Abstract

The utility model belongs to the technical field of battery packs, and discloses a battery pack comprising a coaming, a liquid cooling plate and a battery cell, the battery cell is arranged on the liquid cooling plate; the surrounding plate surrounds the liquid cooling plate and the battery cell, and the liquid cooling plate is connected with the surrounding plate; an accommodating cavity is formed between the coaming and the battery cell; the liquid cooling plate is communicated with a liquid outlet pipe and a liquid inlet pipe, and the liquid outlet pipe and the liquid inlet pipe are both located in the accommodating cavity; the top face and the bottom face of the surrounding plate are each provided with a connecting assembly. The electrical connecting piece and the liquid cooling connecting piece can be surrounded by the surrounding plate and are not exposed to the outside; meanwhile, the top surfaces and the bottom surfaces of the coamings are provided with connecting components which can be embedded with each other, and the cooling plates are fixedly connected with the coamings, so that the coamings of the two battery packs are embedded through the connecting components, the effect of vertically stacking and splicing the two battery packs can be achieved, and the operation of assembling the battery packs into the battery module is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack and a battery module. Background Art

[0002] As the energy source of new energy vehicles, batteries are the most important components of new energy vehicles. Batteries on new energy vehicles are usually battery modules composed of multiple battery packs electrically connected. Different models of new energy vehicles have different demands for electricity. For example, medium and large vehicles usually require more abundant power reserves, while small vehicles only require less power reserves. Therefore, the battery modules on medium and large vehicles contain more battery packs than those on small vehicles.

[0003] Existing battery packs have a low degree of modularity. When multiple battery packs are connected, an additional fixing frame is required to fix the multiple battery packs together, resulting in low assembly efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pack and a battery module, so as to simplify the operation of assembling the battery pack into a battery module.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A battery pack comprises an enclosure, a liquid cooling plate and a battery cell; the battery cell is arranged on the liquid cooling plate; the enclosure surrounds the liquid cooling plate and the battery cell, and the liquid cooling plate is connected to the enclosure; a accommodating cavity is provided between the enclosure and the liquid cooling plate; the liquid cooling plate is connected to a liquid outlet pipe and a liquid inlet pipe, and the liquid outlet pipe and the liquid inlet pipe are both located in the accommodating cavity; the battery cell is provided with an output pole, and the output pole is located in the accommodating cavity; the top surface and the bottom surface of the enclosure are provided with connecting components that can be interlocked with each other.

[0007] Preferably, the connecting assembly comprises an insert and a groove; one of the insert or the groove is arranged on the bottom surface of the enclosure; and the other of the insert or the groove is arranged on the top surface of the enclosure.

[0008] Preferably, the connecting component includes a first insert, a first groove, a second insert and a second groove; the first insert and the first groove are arranged on the top surface of the enclosure; the second insert and the second groove are arranged on the bottom surface of the enclosure; the first insert is adapted to the second groove; the second insert is adapted to the first groove.

[0009] Preferably, a plurality of limit plates are provided on the liquid cooling plate, and the limit plates abut against two side surfaces of the battery cells in the arrangement and stacking direction; and the limit plates are fixedly connected to the enclosure plate.

[0010] Preferably, the limiting plate is hollow inside.

[0011] Preferably, a support plate is provided inside the limiting plate for improving the structural strength of the limiting plate along the direction in which the battery cells are arranged and stacked.

[0012] Preferably, the interior of the enclosure is hollow.

[0013] Preferably, a reinforcing plate is provided inside the enclosure for improving the structural strength of the enclosure.

[0014] Another object of the present invention is to provide a battery module, comprising a plurality of battery packs as described above, wherein all of the battery packs are stacked and assembled, and two adjacent battery packs are connected via the connecting assembly.

[0015] Preferably, the enclosure arranged along the direction of arrangement and stacking of the battery cells is provided with a liquid inlet main pipe and a liquid outlet main pipe; the liquid outlet pipe is connected in parallel and communicated with the liquid outlet main pipe, and the liquid inlet pipe is connected in parallel and communicated with the liquid inlet main pipe.

[0016] Beneficial effects of the utility model:

[0017] The liquid cooling plate and the battery cells are surrounded by an enclosure, and the liquid inlet pipe, the liquid outlet pipe and the output pole are all located in the accommodating cavity between the enclosure and the liquid cooling plate, so that the electrical connectors and the liquid cooling connectors can be surrounded by the enclosure and are not exposed to the outside world; at the same time, the top and bottom surfaces of the enclosure are provided with connecting components that can be interlocked with each other, and the cooling plate is fixedly connected to the enclosure, and the enclosures of the two battery packs can be engaged through the connecting components to achieve the effect of stacking and assembling the two battery packs up and down, thereby simplifying the operation of assembling the battery packs into battery modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the battery pack of the utility model;

[0019] Figure 2 It is a schematic diagram of the internal structure of an embodiment of the battery pack of the utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the battery pack in a stacked state in an embodiment of the utility model;

[0021] Figure 4 yes Figure 3 A magnified view of part A;

[0022] Figure 5 It is a structural schematic diagram of a connecting assembly in another embodiment of the battery pack of the utility model;

[0023] Figure 6It is a schematic diagram of the overall structure of an embodiment of the battery module of the utility model.

[0024] In the figure: 1. enclosure; 2. liquid cooling plate; 3. battery cell; 4. accommodating chamber; 5. insert; 6. groove; 7. first insert; 8. first groove; 9. second insert; 10. second groove; 11. limit plate; 12. support plate; 13. reinforcement plate; 14. top plate; 15. liquid outlet main pipe; 16. liquid inlet main pipe; 17. copper busbar; 18. high-voltage connector; 19. output pole; 20. liquid outlet pipe; 21. liquid inlet pipe. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] In the description of this embodiment, the terms "upper", "lower" and other positions or positional relationships are based on the positions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0029] Reference Figure 1 , is an embodiment of a battery pack of the utility model, comprising a surrounding plate 1, a liquid cooling plate 2 and a battery cell 3; the battery cell 3 is arranged on the liquid cooling plate 2; the surrounding plate 1 surrounds the liquid cooling plate 2 and the battery cell 3, and the liquid cooling plate 2 is connected to the surrounding plate 1; a receiving cavity 4 is provided between the surrounding plate 1 and the liquid cooling plate 2; the liquid cooling plate 2 is connected to be provided with a liquid outlet pipe 20 and a liquid inlet pipe 21, and the liquid outlet pipe 20 and the liquid inlet pipe 21 are both located in the receiving cavity 4; the battery cell 3 is provided with an output pole 19, and the output pole 19 is located in the receiving cavity 4; the top surface and the bottom surface of the surrounding plate 1 are provided with connecting components that can be embedded with each other.

[0030] The liquid cooling plate 2 is a rectangular hollow plate, the liquid inlet pipe 21 and the liquid outlet pipe 20 are both arranged at one end of the liquid cooling plate 2 in the length direction, and a plurality of battery cells 3 are arranged on the liquid cooling plate 2 along the length direction of the liquid cooling plate 2. The enclosure 1 is rectangular as a whole, and the enclosure 1 surrounds the outside of the liquid cooling plate 2. The two length sides of the liquid cooling plate 2 are welded to the enclosure 1 to achieve a fixing effect, and there is a certain interval between the two width sides of the battery cells 3 and the enclosure 1 to form two accommodating cavities 4. The enclosure 1 is composed of four plates, namely two plates in the width direction and two plates in the length direction. The adjacent two plates are connected by bolts or welding. In this embodiment, welding is adopted, and the two width sides of each plate are inclined surfaces to increase the contact area between the adjacent two plates, so that the adjacent two plates can be welded more firmly. The enclosure 1 surrounds the liquid cooling plate 2 and the battery cell 3, and the liquid inlet pipe 21, the liquid outlet pipe 20 and the output pole 19 are all located in the accommodating cavity 4 between the enclosure 1 and the liquid cooling plate 2, so that the electrical connectors and the liquid cooling connectors can be surrounded by the enclosure 1 without being exposed to the outside world; at the same time, the top and bottom surfaces of the enclosure 1 are provided with connecting components that can be interlocked with each other, and the cooling plate is fixedly connected to the enclosure 1. The enclosures 1 of the two battery packs can be engaged by the connecting components to achieve the effect of stacking and assembling the two battery packs up and down, thereby simplifying the operation of assembling the battery packs into battery modules.

[0031] In this embodiment, the connecting component includes a first insert 7, a first groove 8, a second insert 9 and a second groove 10; the first insert 7 and the first groove 8 are arranged on the top surface of the enclosure 1; the second insert 9 and the second groove 10 are arranged on the bottom surface of the enclosure 1; the first insert 7 is adapted to the second groove 10; the second insert 9 is adapted to the first groove 8.

[0032] Reference Figures 1 to 4The first insert 7 is plate-shaped and is arranged along the extension direction of the top surface of the enclosure 1. The first insert 7 is integrally formed with the enclosure 1. The first insert 7 is located on the side of the top surface of the enclosure 1 close to the liquid cooling plate 2, and the first groove 8 is formed on the side of the top surface of the enclosure 1 away from the liquid cooling plate 2. The second insert 9 is located on the side of the bottom surface of the enclosure 1 away from the liquid cooling plate 2, and the second groove 10 is formed on the side of the bottom surface of the enclosure 1 close to the liquid cooling plate 2. The first insert 7 and the second insert 9 have the same shape, so that when two adjacent enclosures 1 are stacked together, the second insert 9 of the upper enclosure 1 is inserted into the first groove 8 of the lower enclosure 1, and the first insert 7 of the lower enclosure 1 is inserted into the second groove 10 of the upper enclosure 1, and the first insert 7 and the second insert 9 form a state similar to a mortise and tenon structure. In order to further improve the connection firmness between the two adjacent enclosures 1, after the two enclosures 1 are spliced ​​together, fasteners such as bolts can be inserted into the overlapping parts of the first insert 7 and the second insert 9, so that the bolts can keep the first insert 7 and the second insert 9 relatively fixed, thereby enabling the two adjacent enclosures 1 to be fixedly connected.

[0033] In another embodiment, referring to Figure 5 The connection assembly may include an insert 5 and a groove 6; the insert 5 is arranged on the bottom surface of the enclosure 1; and the groove 6 is arranged on the top surface of the enclosure 1.

[0034] When two battery packs are spliced ​​and assembled, the insert 5 of the upper enclosure 1 is inserted into the groove 6 of the lower enclosure 1, thus realizing the splicing of the enclosures 1 of the two battery packs. The insert 5 is in the shape of a plate arranged along the bottom surface of the enclosure 1, and is arranged along the extension direction of the bottom surface of the enclosure 1. The insert 5 can be connected to the enclosure 1 by welding or integral molding. In this embodiment, the insert 5 is integrally molded with the enclosure 1, and the groove 6 is arranged corresponding to the insert 5. In order to further improve the firmness of the connection between two adjacent enclosures 1, after the two enclosures 1 are spliced ​​with the insert 5 and the groove 6, fasteners such as bolts can be inserted into the enclosure 1 from the connection between the insert 5 and the groove 6, that is, the bolts pass through the insert 5 and the groove 6, so that the insert 5 and the groove 6 remain relatively fixed.

[0035] In this embodiment, a plurality of limit plates 11 are provided on the liquid cooling plate 2, and the limit plates 11 abut against the two side surfaces of the extension direction of the arrangement of the plurality of battery cells 3. The extension direction of the battery cells 3 is the stacking arrangement direction of the battery cells 3, and the limit plates 11 are fixedly connected to the enclosure 1.

[0036] The limiting plate 11 is rectangular, and the length direction of the limiting plate 11 is the width direction of the battery cell 3. The two width sides of the limiting plate 11 are welded to the surrounding plate 1, and the bottom surface of the limiting plate 11 is welded to the liquid cooling plate 2. The limiting plate 11, the liquid cooling plate 2 and the surrounding plate 1 tightly surround the battery cell 3 to prevent the battery cell 3 from expanding. The accommodating cavity 4 is located on the side of the limiting plate 11 away from the battery cell 3.

[0037] In this embodiment, the limiting plate 11 is hollow inside, which can reduce the weight of the limiting plate 11 , reduce the weight of the liquid cooling plate 2 , and prevent the liquid cooling plate 2 from deforming.

[0038] In this embodiment, a support plate 12 is provided inside the limiting plate 11 for improving the structural strength of the limiting plate 11 along the extending direction of the battery core 3 .

[0039] The limiting plate 11 is used to resist the expansion of the battery cell 3, so it needs to have sufficient structural strength to avoid deformation. The support plate 12 is rectangular, and the length direction of the support plate 12 is in the same direction as the length direction of the limiting plate 11. The support plate 12 is parallel to the top and bottom surfaces of the limiting plate 11. The two side edges of the support plate 12 distributed along its own width direction are welded to the inner side wall of the limiting plate 11, that is, the structural strength of the limiting plate 11 is strengthened from the width direction of the support plate 12. The number of support plates 12 in the limiting plate 11 can be arbitrary. In this embodiment, three support plates 12 are arranged in the limiting plate 11 at intervals along the width direction of the limiting plate 11, so that the structural strength of the limiting plate 11 can be improved while reducing the weight of the limiting plate 11.

[0040] In another embodiment, the two side edges of the support plate 12 along the length direction are respectively in contact with the top and bottom surfaces of the limiting plate 11, and the two side edges of the support plate 12 along the width direction are respectively welded to the two side walls of the limiting plate 11, which also strengthens the structural strength of the limiting plate 11 from the width direction of the support plate 12. In the arrangement of the support plates 12 in this embodiment, multiple support plates 12 need to be arranged in parallel in the limiting plate 11 along the length direction of the limiting plate.

[0041] In this embodiment, the interior of the enclosure 1 is hollow, which can reduce the weight of the entire battery pack. When multiple battery packs form a battery module, the weight borne by the bottom battery pack can be reduced.

[0042] In this embodiment, a reinforcing plate 13 is provided inside the enclosure 1 for improving the structural strength of the enclosure 1 .

[0043] Because when the battery packs form a battery module, the enclosure 1 of each battery pack needs to directly bear the weight from the battery pack above (except the enclosure 1 of the topmost battery pack), so the hollow enclosure 1 needs to be reinforced in terms of structural strength. The reinforcing plate 13 is rectangular, and the extension direction of the reinforcing plate 13 is the same as the extension direction of the enclosure 1. The reinforcing plate 13 is arranged obliquely in the enclosure 1. Specifically, there is an angle between the width direction of the reinforcing plate 13 and the top surface or bottom surface of the enclosure 1. Such an arrangement can provide structural reinforcement for the thickness direction and width direction of the enclosure 1. The number of reinforcing plates 13 in the enclosure 1 can be arbitrary. In this embodiment, there are two reinforcing plates 13 in the enclosure 1. The two reinforcing plates 13 are symmetrically arranged with the midline of the width of the enclosure 1 as the axis, so that the structural strength of the enclosure 1 can be improved while reducing the weight of the enclosure 1.

[0044] Reference Figure 3 and Figure 6 , is an embodiment of a battery module of the utility model, which is composed of four stacked battery packs as described above, and two adjacent battery packs are embedded and connected by a connecting component.

[0045] Specifically, the top of the top battery pack is covered with a top plate 14, while the tops of the other three battery packs are covered by the liquid cooling plate 2 of the upper battery pack. The enclosures 1 of two adjacent battery packs are engaged with each other by inserting the first insert 7 into the second groove 10, and the second insert 9 into the first groove 8, and bolts are inserted into the first insert 7 and the second insert 9 to fix the two adjacent enclosures 1.

[0046] In this embodiment, the enclosure 1 of the battery pack facing the accommodating cavity 4 is provided with a liquid inlet main pipe 16 and a liquid outlet main pipe 15; the liquid outlet pipe 20 is connected in parallel and communicated with the liquid outlet main pipe 15, and the liquid inlet pipe 21 is connected in parallel and communicated with the liquid inlet main pipe 16.

[0047] Specifically, the liquid inlet manifold 16 and the liquid outlet manifold 15 can be respectively installed on different enclosures 1, or can be installed together on the same enclosure 1. In this embodiment, the liquid inlet manifold 16 and the liquid outlet manifold 15 are both installed on the enclosure 1 facing the battery pack at the bottom layer, which is provided with the liquid inlet pipe 21 and the liquid outlet pipe 20. The liquid inlet pipes 21 of the four battery packs are respectively connected to a main pipe through a branch pipe, and the main pipe is further connected to the liquid inlet manifold 16. The liquid outlet pipes 20 of the four battery packs are respectively connected to a main pipe through a branch pipe, and the main pipe is further connected to the liquid outlet manifold 15. In this way, the cooling liquid can be introduced into the four liquid cooling plates 2 by only introducing the cooling liquid into the liquid inlet manifold 16, and the cooling liquid of the four liquid cooling plates 2 can be led out by only leading out the cooling liquid flowing out of the liquid outlet manifold 15. The output poles 19 of two adjacent battery packs are electrically connected through the copper busbar 17. The copper busbar 17 of the topmost battery pack is connected to a high-voltage connector 18. The high-voltage connector 18 passes through the enclosure 1 and is used to connect to external electrical equipment. The battery module composed of the aforementioned battery packs has its electrical connectors (i.e., the copper busbar 17, the output pole 19, etc.) and liquid cooling connectors (i.e., the liquid inlet pipe 21, the liquid outlet pipe 20, etc.) contained in the accommodating chamber 4 by the enclosure 1 and will not be exposed to the outside world, thus avoiding damage to the electrical connectors and liquid cooling connectors. Different numbers of battery packs can be set according to different vehicle models, and assembly is simple and quick.

[0048] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery pack, characterized in that: It includes an enclosure, a liquid cooling plate and a battery cell; the battery cell is arranged on the liquid cooling plate; the enclosure surrounds the liquid cooling plate and the battery cell, and the liquid cooling plate is connected to the enclosure; a accommodating cavity is provided between the enclosure and the battery cell; the liquid cooling plate is connected to be provided with a liquid outlet pipe and a liquid inlet pipe, and the liquid outlet pipe and the liquid inlet pipe are both located in the accommodating cavity; the top surface and the bottom surface of the enclosure are provided with connecting components.

2. The battery pack according to claim 1, characterized in that: The connecting component includes an insert and a groove; the insert is arranged on the bottom surface of the enclosure; and the groove is arranged on the top surface of the enclosure.

3. The battery pack according to claim 1, characterized in that: The connecting component includes a first insert, a first groove, a second insert and a second groove; the first insert and the first groove are arranged on the top surface of the enclosure; the second insert and the second groove are arranged on the bottom surface of the enclosure; the first insert is adapted to the second groove; the second insert is adapted to the first groove.

4. The battery pack according to claim 1, characterized in that: The liquid cooling plate is provided with a plurality of limit plates, the limit plates abut against two side surfaces of the battery cells in the arrangement and stacking direction; the limit plates are fixedly connected to the enclosure plate.

5. The battery pack according to claim 4, characterized in that: The limiting plate is hollow inside.

6. The battery pack according to claim 5, characterized in that: A support plate is provided inside the limiting plate for improving the structural strength of the limiting plate along the direction in which the battery cells are arranged and stacked.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The interior of the enclosure is hollow.

8. The battery pack according to claim 7, characterized in that: A reinforcing plate for improving the structural strength of the enclosure is arranged inside the enclosure.

9. A battery module, characterized in that: It comprises a plurality of battery packs as described in any one of claims 1 to 8, all of the battery packs are stacked and assembled, and two adjacent battery packs are connected by the connecting assembly.

10. The battery module according to claim 9, characterized in that: The enclosure arranged along the direction of arrangement and stacking of the battery cells is provided with a liquid inlet main pipe and a liquid outlet main pipe; the liquid outlet pipe is connected in parallel and communicated with the liquid outlet main pipe, and the liquid inlet pipe is connected in parallel and communicated with the liquid inlet main pipe.

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