Battery pack and electricity-using device

Abstract

To provide a battery pack capable of enhancing energy density, simplifying a structure, and enhancing integration.SOLUTION: A battery pack includes a case 10, a cooling plate 22, and a battery cell module 30, the case is provided with an accommodation space, and the battery cell module is located in the accommodation space and includes a plurality of battery cells regularly arranged on a horizontal plane and provided at equal intervals. The accommodation space is filled with a potting adhesive, and the cooling plate abuts against upper sides and / or lower sides of the battery cell modules and the potting adhesive.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application bearing application number 202421643057.9, filed with the China Patent Office on July 11, 2024, the entire contents of which are incorporated herein by reference.

[0002] This application relates to the technical field of batteries, for example, battery packs and electrical-using devices. [Background technology]

[0003] The volume utilization efficiency of cylindrical battery systems is inherently inferior to that of prismatic battery systems. Summary of the Invention [Problem to be solved by the invention]

[0004] Serpentine pipes or extruded pipes are used as cooling pipes between multiple columnar battery cells, which means that a large amount of space is occupied by the serpentine pipes in the planar direction, reducing the volume utilization efficiency of the cylindrical battery system. Serpentine pipe battery systems require a large number of components within the pipes, which increases the cost of the components. Furthermore, the heat dissipation uniformity of multiple battery cells within the battery pack is poor. [Means for solving the problem]

[0005] The present application provides a battery pack that can increase the energy density of the battery pack, simplify the structure, and increase the integration degree of the battery pack.

[0006] The present application provides an electrically powered device that employs a battery pack according to the present application, which has a longer operating time, fewer parts, and is quicker to assemble.

[0007] The battery pack includes a case having an accommodation space, a battery cell module located within the accommodation space and having a plurality of battery cells regularly arranged and evenly spaced on a horizontal plane and filled with potting adhesive, and a cooling plate abutting the upper and / or lower sides of the battery cell module and the potting adhesive.

[0008] The present application further provides an electricity-using device including the battery pack of the present application. [Effects of the Invention]

[0009] The beneficial effects of the present application are as follows: By providing a cooling plate above and / or below the battery cell module, the battery pack according to the present application eliminates the need for a serpentine plate between the battery cells on a horizontal surface, allowing for more space to accommodate the battery cells on the horizontal surface and increasing energy density; similarly, the need for a liquid cooling structure for the serpentine plate can be eliminated altogether, simplifying the layout of the liquid cooling structure and saving space; and, because multiple battery cells are provided at equal intervals, the thermal conductivity of each battery cell to the potting adhesive is more consistent after the adhesive is potted; and, because the cooling plate contacts the adhesive body of the potting adhesive, the heat dissipation of the battery cell module is more uniform. By using the battery pack according to the present application, an electric device can achieve longer operating time, fewer parts, and faster assembly. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a structural schematic diagram of a battery pack according to an embodiment of the present invention; [Figure 2] FIG. 2 is an exploded view of a battery pack according to an embodiment of the present application, with the battery cell modules hidden. [Figure 3] 1 is a structural schematic diagram of a battery pack according to an embodiment of the present application in which a battery cell module is hidden; [Figure 4] FIG. 4 is a cross-sectional view taken along the line AA in FIG. [Figure 5]FIG. 5 is an enlarged view of a portion B in FIG. [Figure 6] 1 is an exploded view of the structure of a battery pack according to an embodiment of the present application. [Figure 7] FIG. 10 is an exploded view of the structure of another battery pack according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present application provides a battery pack that can increase the energy density of the battery pack, simplify the structure, and improve the integration of the battery pack. As shown in Figures 1 and 2, the battery pack includes a case 10, a cooling plate 22, and a battery cell module 30. The case 10 has an accommodation space, and the battery cell module 30 is located in the accommodation space and includes a plurality of battery cells 31. The plurality of battery cells 31 are regularly arranged and equally spaced on a horizontal plane. A potting adhesive is filled in the battery cell module, and the cooling plate 22 abuts against the upper and / or lower sides of the battery cell module 30 and the potting adhesive. In the battery pack, by providing the cooling plates 22 on the upper and / or lower sides of the battery cell modules 30, the installation of serpentine plates between the battery cells 31 on the horizontal surface is eliminated, allowing for more space to accommodate the battery cells 31 on the horizontal surface and increasing the energy density of the battery pack. Similarly, the installation of a liquid cooling structure for the serpentine plate can be eliminated altogether, simplifying the arrangement of the liquid cooling structure and saving space. Furthermore, because the multiple battery cells 31 are arranged at equal intervals, there is good consistency in the heat conduction of each battery cell 31 to the potting adhesive after the adhesive is potted, and the cooling plates 22 come into contact with the adhesive body of the potting adhesive, improving the uniformity of heat dissipation of the battery cell modules 30.

[0012] The battery cells 31 are columnar, and a plurality of the battery cells 31 are arranged in a plurality of rows, with the battery cells 31 in adjacent rows being offset from one another. In this manner, the columnar battery cells 31 can be easily designed to have equal spacing between adjacent battery cells 31. In other embodiments, the battery cells 31 may be rectangular or polygonal.

[0013] The cooling plate 22 is abutted against the underside of the battery cell module 30 and potting adhesive, and the battery pack further includes an integrated module 20, which is stacked in sequence on the bottom side of the case 10 and includes a supporter 21 and a cooling plate 22 fixedly connected together, and the battery cell module 30 is located above the integrated module 20. The cooling plate 22 is located above the supporter 21 and is in direct contact with the battery cells 31 below, improving the heat exchange effect. At the same time, the cooling plate 22 is fixedly connected to the supporter 21 and supports the battery cell module 30 together with the supporter 21, which prevents the cooling plate 22 from being crushed and increases the supporting strength.

[0014] In other embodiments, the cooling plate 22 may be provided above the battery cell module 30 as shown in FIG. 6, or may be provided above and below the battery cell module 30 as shown in FIG. 7, but this is not limited thereto.

[0015] The cooling plate 22 and the supporter 21 are connected by brazing or crimping. Brazing has the advantage of ensuring the stability of the outer shapes of the cooling plate 22 and the supporter 21, as it causes little deformation and the welding position is smooth and neat. The crimping connection method is quicker and more convenient.

[0016] The integral member consisting of the cooling plate 22 and the supporter 21 is also connected to the case 10 by brazing or crimping.

[0017] 2, the integrated module 20 further includes a foam adhesive layer 23 filled between the supporter 21 and the cooling plate 22. The foam adhesive layer 23 further strengthens the support strength of the integrated module 20 for the battery cell module 30 and can meet the multiple operating conditions and complex application requirements of the battery pack. For example, when the battery pack is subjected to an external impact, the foam adhesive layer 23 provides a good cushioning effect and can prevent the cooling plate 22 and the supporter 21 from breaking or deforming.

[0018] Both the supporter 21 and the cooling plate 22 have a plurality of through holes, with the plurality of first through holes in the supporter 21 corresponding one-to-one to the plurality of second through holes in the cooling plate 22, and the plurality of battery cells 31 being placed one-to-one above the plurality of second through holes. The through holes not only serve to restrict the position of the battery cells 31, but also provide a stable pressure relief for the battery cells 31 in the event of thermal runaway. The additional cooling provided by the liquid cooling system further reduces the temperature caused by thermal runaway and reduces the risk of thermal diffusion in the system.

[0019] 2, the integrated module 20 further includes an insulating layer 24 disposed between the battery cell module 30 and the integrated module 20. When the battery cells 31 are not damaged, the insulating layer 24 covers the through-holes, thereby providing insulation and ensuring sealing. When the battery cells 31 are damaged, the impact force caused by the damaged battery cells 31 can break through the insulating layer 24, ensuring pressure relief. The insulating layer 24 may be attached to the top of the cooling plate 22 or may be laminated on the cooling plate 22 by hot pressing, but this is not limited thereto.

[0020] Since the filling thickness of the foam adhesive layer 23 is only a few millimeters, the impact force caused by the failure of the battery cell 31 can also break through the foam adhesive layer 23, realizing pressure relief.

[0021] As shown in FIG. 1, the installation of potting adhesive in the case 10 located on top of the integrated module 20 is advantageous for fixing the battery cells 31 and can also improve the temperature matching between the battery cell modules 30.

[0022] The potting adhesive comprises a bottom layer adhesive positioned between the battery cell module 30 and the integrated module 20 (i.e., the cooling plate 22), and a gap adhesive positioned on top of the bottom layer adhesive and filled inside the battery cell module 30 or between the battery cell module 30 and the case 10.

[0023] In one embodiment, the bottom layer adhesive is a thermally conductive adhesive and the gap adhesive is a foam adhesive, and such an installation increases the heat conduction rate between the battery cells 31 and the cooling plate 22, and the foam adhesive fixes the battery cells 31 while preventing one of the battery cells 31 from failing and causing the other battery cells 31 to fail.

[0024] In one embodiment, the bottom adhesive and the gap adhesive are both foam adhesives, and such an installation makes the overall structural strength of the battery pack more uniform and improves impact resistance.

[0025] In one embodiment, the bottom adhesive and the gap adhesive are both thermally conductive adhesives, and this arrangement provides the best temperature uniformity for the multiple battery cells 31 .

[0026] The gaps between adjacent through-holes are consistent, that is, the gaps between battery cells 31 are consistent. The distance between two adjacent battery cells 31 is L, where 0.5 mm < L ≤ 10 mm. To meet the assembly requirements and the thermal safety requirements of the battery pack, a gap of 0.5 mm is pre-set for the gap, so that the accommodation space in the battery pack can be utilized to the maximum extent. The installation of the serpentine tube in the related technology cannot guarantee that the gaps between battery cells 31 are equal. However, in this embodiment, on the premise of omitting the serpentine tube, by making the gaps between battery cells 31 equal, the design difficulty of the components inside the battery pack can be simplified, the integrity of the battery system can be increased, and the consistency of the adhesive potted between battery cells 31 can be improved by the equidistant design, and the temperature uniformity performance of the battery cell module 30 can be further enhanced.

[0027] As shown in FIGS. 3 to 5, a pressure relief space 40 is formed between the integrated module 20 and the bottom plate 12 of the case 10. All of the plurality of first through-holes and the plurality of second through-holes communicate with the pressure relief space 40, and the pressure relief space 40 communicates with the outside of the case 10. When the battery cell 31 fails, the gas can rapidly enter the pressure relief space 40 from the through-hole and then rush out of the case 10, realizing rapid pressure relief and preventing the explosion caused by the accumulation of gas in the battery pack. The height of the pressure relief space 40 is between 1 mm and 50 mm, and it can be flexibly adjusted based on the requirements of pressure relief and bottom protection. Among them, a pressure relief passage for communicating the pressure relief space 40 with the outside of the case 10 may be opened on the side wall 11 of the case 10. Since this structure is often provided in the related technology, it will not be repeatedly described here.

[0028] 2 , the cooling plate 22 includes a support plate 221, a flow path plate 222, a water inlet pipe 223, and a water outlet pipe 224. The battery cell modules 30 are placed on the support plate 221, and the flow path plate 222 is fixedly connected to the support plate 221, forming a flow path through which liquid flows. The supporter 21 is located on the side of the flow path plate 222 away from the support plate 221. The water inlet pipe 223 and the water outlet pipe 224 are both attached to the support plate 221 and communicate with both ends of the flow path. The cooling liquid enters through the water inlet pipe 223, flows through the flow path formed in the flow path plate 222, exchanges heat with the battery cell modules 30, and then exits through the water outlet pipe 224, thereby circulating and exchanging heat. The support plate 221 and the flow path plate 222 are connected by brazing, which minimizes deformation of the cooling plate 22.

[0029] The insulating layer 24 is located on the upper layer of the support plate 221 , and the foam adhesive layer 23 is located between the flow path plate 222 and the supporter 21 .

[0030] This embodiment also provides an electric device including a battery pack according to the embodiment of the present application. By adopting this battery pack, the electric device can have a longer driving time, fewer parts, and faster assembly. For example, the electric device may be, but is not limited to, a new energy vehicle or a ship. [Explanation of symbols]

[0031] 10···Case, 11···Side wall, 12···Bottom plate, 20···Integration module, 21···Supporter, 22···Cooling plate, 221···Support plate, 222···Flow path plate, 223···Inlet pipe, 224···Outlet pipe, 23···Foam adhesive layer, 24···Insulating layer, 30···Battery cell module, 31···Battery cell, 40···Pressure relief space.

Claims

1. Case (10) where a storage space is opened; a battery cell module (30) located in the storage space, the battery cell module (30) including a plurality of battery cells (31) regularly arranged and equally spaced on a horizontal plane, the battery cell module (30) being filled with a potting adhesive; a cooling plate (22) abutting against at least one of the upper and lower sides of the battery cell module (30) and the potting adhesive; Battery pack.

2. The distance between two adjacent battery cells (31) is L, and 0.5 mm<L≦10 mm. The battery pack according to claim 1 .

3. The cooling plate (22) is provided abutting the underside of the battery cell module (30) and the potting adhesive, and the battery pack further includes a supporter (21), the cooling plate (22) and the supporter (21) are sequentially stacked on the bottom side of the case (10), the cooling plate (22) is located between the supporter (21) and the battery cell module (30), and the cooling plate (22) and the supporter (21) are fixedly connected together to form an integrated module (20) in the battery pack. The battery pack according to claim 1 .

4. The potting adhesive includes a bottom layer adhesive positioned between the battery cell module (30) and the integrated module (20), and a gap adhesive positioned on top of the bottom layer adhesive and filling the inside of the battery cell module (30) or between the battery cell module (30) and the case (10), The bottom layer adhesive is a thermally conductive adhesive, and the gap adhesive is a foam adhesive; Alternatively, the bottom layer adhesive and the gap adhesive are both foam adhesives; Alternatively, the bottom layer adhesive and the gap adhesive are both thermally conductive adhesives; The battery pack according to claim 3 .

5. The cooling plate (22) and the supporter (21) are connected by brazing or crimping. The battery pack according to claim 3 .

6. The integrated module (20) further includes a foam adhesive layer (23) filled between the supporter (21) and the cooling plate (22). The battery pack according to claim 3 .

7. The integrated module (20) further includes an insulating layer (24) disposed between the battery cell module (30) and the integrated module (20). The battery pack according to claim 3 .

8. A plurality of through holes are formed in both the supporter (21) and the cooling plate (22), the plurality of first through holes in the supporter (21) and the plurality of second through holes in the cooling plate (22) are provided in one-to-one correspondence, and the plurality of battery cells (31) are placed above the plurality of second through holes in one-to-one correspondence. The battery pack according to claim 3 .

9. A pressure relief space (40) is formed between the integrated module (20) and the bottom plate (12) of the case (10), the pressure relief space (40) communicating with both the plurality of first through holes and the plurality of second through holes and communicating with the outside of the case (10). The battery pack according to claim 8.

10. The height of the pressure relief space is H, and 1 mm≦H≦50 mm. The battery pack according to claim 9.

11. The cooling plate (22) a support plate (221) on which the battery cell module (30) is placed; a flow path plate (222) fixedly connected to the support plate (221), having a flow path formed therein through which a liquid flows, and the supporter (21) being located on a side away from the support plate (221); and a water inlet pipe (223) and a water outlet pipe (224), both of which are attached to the support plate (221) and communicate with both ends of the flow path, respectively. The battery pack according to any one of claims 3 to 10.

12. The battery cells (31) are columnar, the plurality of battery cells (31) are arranged in a plurality of rows, and the battery cells (31) in each adjacent row are provided with a misalignment. The battery pack according to any one of claims 1 to 10.

13. A battery pack according to any one of claims 1 to 10, Electrical usage devices.

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