Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a base, a water cooling plate, a battery cell module and a cover body, the base is of an integrated structure and comprises a concave area, a side wall and two water inlets and outlets. Two supports are arranged in the concave area and correspond to the two water inlets and outlets respectively. The water-cooling plate comprises a main body and two water inlet and outlet pipes; a connecting plate is arranged at one end of each water inlet and outlet pipe; the connecting plate is hermetically connected to the support and used for sealing the opening in the support, so that the water inlet / outlet pipe is hermetically communicated with the water inlet / outlet. The battery pack disclosed by the utility model has the advantages of reducing parts, shortening process flow, reducing welding surfaces, reducing potential leakage risk and the like.

Description

Technical Field

[0001] The utility model relates to the field of energy storage systems, and particularly to a battery pack that can be applied to new energy vehicles, household energy storage devices, commercial energy storage devices, special operation energy storage devices, etc. Background Art

[0002] Battery packs are increasingly used in new energy vehicles and other energy storage devices. They are the most core components of electric vehicles, used to centrally protect and manage battery packs, prevent water ingress, regulate battery temperature, prevent impacts, etc.

[0003] Taking new energy vehicles as an example, people are raising their awareness of environmental protection, trying to limit or reduce greenhouse gas emissions, and striving to achieve carbon balance. As the market share of new energy vehicles continues to increase, the usage of power batteries will become larger and larger. The first core issue that battery pack manufacturers have to face is the safety and reliability of vehicle power batteries. Vehicle battery packs must meet the IP68 waterproof rating. However, most traditional battery packs adopt welded box bodies and welded cooling channels. For example, Chinese Patent Publication No. CN215731887U discloses a battery box, in which the lower end of the box body and the side end of the bottom plate are connected together by friction stir welding, thereby forming a cooling channel in the hollow area. This structural design will not only result in a large number of welding surfaces on the battery pack box body, but also the cooling channels directly face the welding surfaces. Whether the sealing performance of these welding surfaces is safe and reliable will pose a potential threat to the battery pack.

[0004] Another example is Chinese Patent Application Publication No. CN117673434A, which discloses a battery pack. Its battery frame and water-cooled plate are also connected together by friction stir welding, and in the water inlet and outlet areas, a fixing method combining sealant and FDS screws (Flow drill Screws) is adopted. This welding structure may not only damage the structure of the water-cooled plate, but also once the water-cooled plate is welded to the battery frame, if the water inlet and outlet areas of the water-cooled plate are not accurately aligned with the inlets and outlets of the battery frame, then no adjustment can be made, and the product quality cannot be guaranteed.

[0005] Even more, the bottom plate and side walls of the entire battery pack box body are connected together by welding process, and then the water-cooled plate is also welded and fixed thereon. However, this will result in too many parts of the box body, high costs brought by separately manufacturing each part, and too many welding surfaces of the box body, which is neither economical nor has a risk of leakage.

[0006] In view of the above deficiencies of traditional battery packs, it is necessary to design a new battery pack to overcome the above shortcomings. Summary of the Utility Model

[0007] The main purpose of the present utility model is to provide a battery pack, which can reduce the welding seal surface, reduce the potential leakage risk of the welding seal surface, and at the same time reduce the production cost.

[0008] Other purposes and advantages of the present utility model can be further understood from the technical features disclosed in the present utility model.

[0009] To achieve the above object, the present utility model adopts the following technical solutions: A battery pack includes: a base, a water cooling plate, a battery cell module, and a cover body. The base is an integral structure; the base includes a recessed area, side walls, and two water inlets and outlets; wherein, the side walls surround the recessed area, and the water inlets and outlets are arranged on the side walls and communicate with the recessed area; two supports are arranged in the recessed area, corresponding to the two water inlets and outlets respectively; each support has an opening and a support wall surrounding the opening; wherein the opening is communicated with the corresponding water inlet and outlet. The water cooling plate is placed in the recessed area, and the water cooling plate includes a main body and two water inlet and outlet pipes; one end of each water inlet and outlet pipe is provided with a connecting plate; the connecting plate is hermetically connected to the support wall of the support to seal the opening, so that the water inlet and outlet pipe is hermetically communicated with the corresponding water inlet and outlet. The battery cell module is placed on the water cooling plate. The cover body covers the battery cell module and is fixedly connected to the base.

[0010] In one embodiment, the recessed area is divided into a placement area and a connection area; the recessed depth of the placement area is greater than that of the connection area; the placement area is used to accommodate the main body of the water cooling plate, and the connection area is adjacent to the water inlets and outlets; the supports are arranged in the connection area.

[0011] In one embodiment, the contour of the placement area coincides with the contour of the main body of the water cooling plate.

[0012] In one embodiment, shoulders are symmetrically arranged on both sides of the placement area to support the water cooling plate.

[0013] In one embodiment, when the main body of the water cooling plate is installed in the placement area, the top surface of the main body is flush with the bottom surface of the connection area. The connection area is used to accommodate the water inlet and outlet pipes of the water cooling plate.

[0014] In one embodiment, the connecting plate and the water inlet and outlet pipe are of an integral structure.

[0015] In one embodiment, the connecting plate is in a flange shape and is arranged around one end of the water inlet and outlet pipe.

[0016] In one embodiment, the contour of the connecting plate is the same as the contour of the support wall.

[0017] In one embodiment, the base is a die-cast part; the water-cooling plate is an aluminum extrusion water-cooling plate; the opening of the support is upward; the connecting plate is welded to the support wall of the support.

[0018] In one embodiment, the battery pack further includes a front cover plate, which is fixed to the inner side of the cover body and exposed in the front port of the cover body.

[0019] Compared with the prior art, in the battery pack of the present utility model, by designing the base as an integrally formed die-cast part, the components of the whole battery pack can be reduced and the process flow can be shortened. When the water-cooling plate is combined with the base, only welding is needed between the inlet and outlet water pipes of the water-cooling plate and the base to fixedly connect the two, so the welding surface is reduced and the potential leakage risk is lowered. In addition, since only the welding and sealing method is adopted between the connecting plate and the support, and welding is not used in other places, the main structure of the water-cooling plate can be protected from being damaged, further reducing the leakage risk. Moreover, since the water-cooling plate assembly formed by combining the water-cooling plate and the base can provide a flat support surface for the common battery cell module, a stable structure can be formed inside the battery pack, and no shaking will occur due to overall movement, thereby improving the quality of the whole battery pack. Description of the Drawings

[0020] Figure 1 It is a disassembled structure schematic diagram of the battery pack according to one embodiment of the present utility model.

[0021] Figure 2 It is a schematic diagram of the positional relationship of each part in the battery pack according to one embodiment of the present utility model.

[0022] Figure 3 It is a combined structure schematic diagram of the battery pack according to one embodiment of the present utility model.

[0023] Figure 4 It is a schematic diagram of the structure before the base and the water-cooling plate are combined according to one embodiment of the present utility model.

[0024] Figure 5 It is a schematic diagram of the structure after the base and the water-cooling plate are combined according to one embodiment of the present utility model.

[0025] Figure 6 It is a top view of the structure after the base and the water-cooling plate are combined according to one embodiment of the present utility model.

[0026] The reference numerals in the above drawings are described as follows:

[0027] Battery pack 1 Base 10

[0028] Depressed area 11 Side wall 12

[0029] Locking hole 120, water inlet and outlet 13

[0030] Support 14, opening 140

[0031] Support wall 141, accommodating area 15

[0032] Shoulder 150, connecting area 16

[0033] Water cooling plate 20, main body 21

[0034] Water inlet and outlet pipe 22, connecting plate 23

[0035] Cell module 30, cover body 40

[0036] Front port 401, perforation 41

[0037] Fixing holes 42, 51, front cover plate 50 Specific embodiments

[0038] The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the present invention can be implemented. The directional terms mentioned in the present invention, such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc., are only references to the directions in the accompanying drawings. Therefore, the directional terms used are for explaining and understanding the present invention, rather than for limiting the present invention.

[0039] Please refer to Figures 1 to 3 As shown, in one embodiment of the present invention, the battery pack 1 includes a base 10, a water cooling plate 20, a cell module 30, and a cover body 40. The water cooling plate 20 is disposed in the base 10. The cell module 30 is disposed on the water cooling plate 20 and is jointly supported by the base 10 and the water cooling plate 20 to provide a cooling function for it. The cover body 40 covers the cell module 30 and is fixedly connected to the base 10. In this embodiment, the battery pack 1 further includes a front cover plate 50, and the front cover plate 50 is fixed to the inner side of the cover body 40 and is exposed in the front port 401 of the cover body 40.

[0040] In one embodiment, the base 10 is an integral structure, rather than an assembly formed by welding multiple components. Specifically, the base 10 is a die-cast part made by means of integral die-casting to achieve the purpose of having fewer components and a shorter manufacturing process flow. As Figure 4As shown in the figure, the base 10 includes a recessed area 11, side walls 12, and two water inlets and outlets 13. Among them, the recessed area 11 is used to place the water cooling plate 20, the side walls 12 surround the recessed area 11, and the water inlets and outlets 13 are symmetrically arranged on the side walls 12 and communicate with the recessed area 11. It should be noted that the so-called two symmetric water inlets and outlets 13 mean that one is the water inlet and the other is the water outlet. That is to say, in this embodiment, the water inlet and the water outlet are not specifically distinguished and are collectively referred to as the water inlets and outlets 13. In fact, as long as one of them is the water inlet, then the other is the water outlet, which can be determined according to actual use. Therefore, the same reference numeral is used in the drawings to label the water inlets and outlets 13. In addition, in this embodiment, the water inlets and outlets 13 are actually a water inlet and outlet channel (see Figure 6 as shown by the dashed line therein), one end of the channel faces the recessed area 11 (especially towards the support 14 mentioned below, so as to be able to communicate with the opening 140); and the other end of the channel faces the outside of the base 10 and can be connected to the outside through a water inlet and outlet joint.

[0041] As Figure 4 shown, in one embodiment, two supports 14 are provided in the recessed area 11, corresponding to the two water inlets and outlets 13 respectively. Specifically, the supports 14 are attached to the positions of the corresponding water inlets and outlets 13 on the side walls 12. Each support 14 has an opening 140 and a support wall 141 surrounding the opening 140. The opening 140 communicates with its corresponding water inlet and outlet 13. In this embodiment, the opening 140 faces upward to facilitate subsequent welding connection.

[0042] As Figure 4 shown, in one embodiment, the recessed area 11 is divided into a receiving area 15 and a connecting area 16. The connecting area 16 is adjacent to the water inlets and outlets 13, and the supports 14 are provided in the connecting area 16. The bottom surface of the receiving area 15 is lower than the bottom surface of the connecting area 16, that is to say, the recessed depth of the receiving area 15 is greater than the recessed depth of the connecting area 16, so as to better accommodate the water cooling plate 20, and the depth difference between the receiving area 15 and the connecting area 16 can provide a better supporting effect for the battery cell module 30. Please wait for the detailed description later.

[0043] More specifically, as Figure 4 shown, the receiving area 15 is used to accommodate the main body 21 of the water cooling plate 20; the contour of the receiving area 15 coincides with the contour of the main body 21 of the water cooling plate 20. A long strip-shaped shoulder 150 is symmetrically arranged on the left and right sides of the receiving area 15 to support the water cooling plate 20, so that the main body 21 of the water cooling plate 20 fits more closely in the receiving area 15. It should be noted that due to considerations of dimensional accuracy, manufacturing errors, or convenient picking and placing, perhaps the receiving area 15 and the main body 21 will not fit perfectly, but generally it is necessary to ensure that the main body 21 cannot shake in the receiving area 15. The coincidence here includes approximate coincidence and complete coincidence.

[0044] like Figure 4 As shown, the connection area 16 is used to accommodate the inlet and outlet water pipes 22 of the water cooling plate 20 , and serves as a connection point with the water cooling plate 20 , especially as a connection point with the inlet and outlet water pipes 22 of the water cooling plate 20 .

[0045] In one embodiment, the water-cooling plate 20 is an aluminum extruded water-cooling plate 20, such as Figure 4 As shown, the water-cooled plate 20 includes a plate-shaped body 21 and two water inlet and outlet pipes 22. Similarly, the present embodiment does not specifically distinguish between the water inlet pipe and the water outlet pipe. In fact, as long as one of them is the water inlet pipe, the other is the water outlet pipe. In addition, the water-cooled plate 20 is also formed with an internal water cooling channel (not shown) connected to the water inlet and outlet pipes 22.

[0046] Specifically, Figure 4 As shown, in one embodiment, a connection plate 23 is provided at one end of each inlet and outlet water pipe 22, and the connection plate 23 faces the opening 140 of the support 14 and is sealedly connected to the support wall 141 of the support 14, and is used to cover the opening 140 and seal the opening 140, so that the inlet and outlet water pipes 22 of the water-cooled plate 20 are sealedly connected to the support 14, and the inlet and outlet water pipes 22 are sealedly connected with the water inlet and outlet 13 of the base 10. In this embodiment, the sealed connection can be a welding connection or other connection methods that can form a sealing effect. In this embodiment, the connection plate 23 is welded to the support wall 141 of the support 14, so as to form a sealing effect between the connection plate 23 and the support wall 141, thereby achieving a sealed connection between the inlet and outlet water pipes 22 and the water inlet and outlet 13, and preventing leakage of the coolant. In addition, in this embodiment, the connecting plate 23 is flange-shaped, and can also be called a flange plate. It is arranged around one end of the inlet and outlet water pipes 22 of the water cooling plate 20. The connecting plate 23 and the inlet and outlet water pipes 22 can be an integrated structure. The so-called one end of the inlet and outlet water pipes 22 can be the end of the inlet and outlet water pipes 22. It should be noted that the contour of the connecting plate 23 needs to be the same as the contour of the supporting wall 141 (the so-called same includes substantially the same or completely the same), for example, it can be a square (such as Figure 4 As shown) or a circle or other shape, the same contour shape can make the two fit together, making it easier to achieve a sealed connection between the connecting plate 23 and the supporting wall 141, thereby sealing the opening 140.

[0047] Please refer to Figure 5 and Figure 6 As shown, the main body 21 of the water cooling plate 20 is installed to the accommodation area 15 of the base 10 (see the reference numerals). Figure 4)In [the figure], since the contour of the accommodation area 15 fits the contour of the main body 21, the main body 21 can be embedded and fitted into the accommodation area 15, thereby forming a stable fitting effect. At this time, the inlet and outlet pipes 22 of the water-cooling plate 20 and its connecting plate 23 are located in the connection area 16, and the connecting plate 23 can be hermetically connected to the support 14 by welding, so that the inlet and outlet pipes 22 are hermetically communicated with the inlet and outlet ports 13.

[0048] From Figure 5 and Figure 6 In view of the water-cooling plate assembly formed by the combination of the water-cooling plate 20 and the base 10 as shown, in the present utility model, there is only a welded seal surface between the connecting plate 23 of the inlet and outlet pipes 22 and the support 14, and no welded seal surface is formed elsewhere, thus greatly reducing the number of welded seal surfaces and the potential leakage risk. In addition, by adopting the welded seal method between the connecting plate 23 and the support 14, not only can the main body 21 structure of the water-cooling plate 20 be protected from being damaged, but also the connection seal effect or welding quality can be visually observed, thereby avoiding leakage during subsequent inspection and use.

[0049] In addition, from Figure 5 and Figure 6 In view of the water-cooling plate assembly formed by the combination of the water-cooling plate 20 and the base 10 as shown, when the main body 21 of the water-cooling plate 20 is installed in the accommodation area 15 of the base 10, the top surface of the main body 21 of the water-cooling plate 20 is flush with the bottom surface of the connection area 16, and the two together form a flat support surface, providing a better support effect for the battery cell module 30, thereby forming a more stable structure inside the battery pack 1.

[0050] Please refer to Figure 2 as shown. The battery cell module 30 is placed on the water-cooling plate assembly formed by the combination of the water-cooling plate 20 and the base 10, and the water-cooling plate 20 provides a cooling function for it. The front cover plate 50 is erected on the base 10, the cover body 40 covers the battery cell module 30, and the cover body 40 is fixedly connected to the base 10 by screwing, and similarly, the cover body 40 is fixedly connected to the front cover plate 50 by screwing, so that the front cover plate 50 is fixed inside the cover body 40 and exposed at the front port 401 of the cover body 40. Specifically, as Figure 2 shown, a plurality of locking holes 120 are provided on the side wall 12 of the base 10, and a plurality of through holes 41 are also provided on the bottom edge of the cover body 40. By means of a threaded fixing member (not shown) passing through the through holes 41 and screwing into the locking holes 120, the cover body 40 is fixed on the base 10. Similarly, fixing holes 42 and 51 are provided on the front surface of the cover body 40 and the front cover plate 50, and the two are fixedly connected by screwing a threaded fixing member into the fixing holes 42 and 51.

[0051] In summary, for the battery pack 1 of the present utility model, by designing the base 10 as an integrally formed die-casting part, the components of the entire battery pack 1 can be reduced and the process flow can be shortened. When the water-cooling plate 20 is combined with the base 10, only one end of the inlet and outlet water pipes 22 of the water-cooling plate 20 needs to be welded to the support 14 to form a welded sealing surface, and no welded surface is formed elsewhere. Therefore, the welded surface is reduced and the potential leakage risk is lowered. In addition, since only the welded sealing method is adopted between the connecting plate 23 and the support 14, the main body 21 structure of the water-cooling plate 20 can be protected from being damaged, further reducing the leakage risk. Moreover, since the water-cooling plate assembly formed by the combination of the water-cooling plate 20 and the base 10 can provide a flat supporting surface for the common battery cell module 30, a stable structure can be formed inside the battery pack 1, and no shaking will occur due to overall movement, thereby improving the quality of the overall battery pack 1.

Claims

1. A battery pack, characterized in that: include: Base, water cooling plate, battery module and cover; The base is an integrated structure and includes a recessed area, a side wall and two water inlets and outlets; wherein the side wall surrounds the recessed area; the water inlets and outlets are arranged on the side wall and communicate with the recessed area; two supports are arranged in the recessed area, corresponding to the two water inlets and outlets respectively; each of the supports has an opening and a supporting wall surrounding the opening; wherein the opening is communicated with the corresponding water inlet and outlet; The water cooling plate is placed in the recessed area and includes a main body and two water inlet and outlet pipes; a connecting plate is provided at one end of each of the water inlet and outlet pipes; the connecting plate is sealingly connected to the supporting wall of the support to seal the opening, so that the water inlet and outlet pipes are in sealed communication with the corresponding water inlet and outlet ports; The battery module is placed on the water cooling plate; The cover covers the battery core module and is fixedly connected to the base.

2. The battery pack according to claim 1, wherein: The recessed area is divided into a receiving area and a connecting area; The recessed depth of the accommodation area is greater than the recessed depth of the connection area; The accommodation area is used to accommodate the main body of the water-cooling plate, and the connection area is adjacent to the water inlet and outlet; The support is arranged in the connection area.

3. The battery pack according to claim 2, wherein: The contour of the accommodating area matches the contour of the main body of the water cooling plate.

4. The battery pack according to claim 3, wherein: Shoulders are symmetrically arranged on both sides of the accommodating area for supporting the water cooling plate.

5. The battery pack according to claim 3, wherein: When the main body of the water-cooling plate is installed in the accommodating area, the top surface of the main body is flush with the bottom surface of the connecting area; The connection area is used to accommodate the inlet and outlet water pipes of the water cooling plate.

6. The battery pack according to claim 1, wherein: The connecting plate and the water inlet and outlet pipes are an integrated structure.

7. The battery pack according to claim 1, wherein: The connecting plate is flange-shaped and is arranged around the one end of the inlet and outlet water pipes.

8. The battery pack according to claim 1, wherein: The profile of the connecting plate is the same as the profile of the supporting wall.

9. The battery pack according to claim 1, wherein: The base is a die-casting; the water-cooling plate is an aluminum extruded water-cooling plate; the opening of the support faces upward; and the connecting plate is welded to the supporting wall of the support.

10. The battery pack according to claim 1, wherein: The battery pack further includes a front cover plate, which is fixed to the inner side of the cover body and exposed in the front port of the cover body.

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