Battery pack and power-consuming device

Abstract

Battery pack comprising: a box body (10) wherein a base plate (11) is provided at the bottom of the box body (10); a cell (21) and a liquid cooling plate (22) adjoining the cell (21), both of which are arranged inside the box body (10), wherein the liquid cooling plate (22) is provided with a liquid inlet nozzle (223) and a liquid outlet nozzle (224), and wherein both the liquid inlet nozzle (223) and the liquid outlet nozzle (224) penetrate the base plate (11) to the outside of the box body (10);a liquid inlet pipe (30) and a liquid outlet pipe (40) arranged outside the box body (10), wherein the liquid inlet pipe (30) is provided with a first quick-release coupling (31) and the liquid outlet pipe (40) with a second quick-release coupling (41), wherein the first quick-release coupling (31) is connected to the liquid inlet port (223) and the second quick-release coupling (41) is connected to the liquid outlet port (224).

Description

Battery packs and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 28, 2023, with application number 202323630311X. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery pack and electrical equipment. Background Art

[0003] As the primary energy source for new energy vehicles, the performance of the battery pack directly impacts the vehicle's overall performance. Liquid cooling systems are commonly used for heat dissipation. For systems with multiple cold plates, these plates are typically connected using nylon tubing. Quick-connect pipes connect the cold plates to the water nozzles on the chassis, directing the coolant from the cold plates to the exterior of the battery pack.

[0004] This design is prone to the following problems: there are a large number of pipes and quick connectors, and the car is used in a vibrating environment for a long time. The quick connectors or pipes are prone to loosening and poor contact, or the sealing rings inside fail, resulting in leakage. The leaked coolant will flow everywhere inside the battery pack, easily causing a short circuit in the battery pack, or even a fire and other unpredictable dangers.

[0005] Therefore, there is an urgent need to provide a battery pack and an electrical device to solve the above problems. Technical issues

[0006] The present application provides a battery pack and electrical equipment, which effectively solve the problem of internal leakage of the battery pack, are less likely to cause short circuits, and have higher safety. Technical Solutions

[0007] In a first aspect, an embodiment of the present application provides a battery pack, comprising:

[0008] A box body, wherein the bottom of the box body is provided with a bottom guard plate;

[0009] The battery cell and the liquid cooling plate attached to the battery cell are arranged in the box body, and the liquid cooling plate is provided with a liquid inlet nozzle and a liquid outlet nozzle, and the liquid inlet nozzle and the liquid outlet nozzle both pass through the bottom guard plate to the outside of the box body;

[0010] The liquid inlet pipe and the liquid outlet pipe are arranged outside the box body, the liquid inlet pipe is provided with a first quick connector, and the liquid outlet pipe is provided with a second quick connector. The first quick connector is connected to the liquid inlet nozzle, and the second quick connector is connected to the liquid outlet nozzle.

[0011] In a second aspect, an embodiment of the present application provides an electrical device comprising the above-mentioned battery pack. Beneficial effects

[0012] In the battery pack provided by the present application, the coolant flows into the liquid cooling plate through the first quick connector and the liquid inlet nozzle to cool the battery cells. The heated coolant flows out from the liquid outlet nozzle and the second quick connector to the liquid outlet pipe, completing the cooling of the battery cells. In this battery pack, the liquid inlet nozzle, liquid inlet pipeline, liquid outlet nozzle and liquid outlet pipeline are all located at the bottom of the box, realizing a design without pipeline connection and quick connector inside the battery pack. Even if leakage occurs at the quick connector, it only occurs on the outside of the battery pack, avoiding leakage inside the battery pack and damaging the battery pack, thereby improving the service life and safety of the battery pack. Secondly, since the quick connector is located at the bottom of the battery pack, when a quick connector fails to leak, it can be quickly replaced outside the battery pack without disassembling the entire battery pack, which will reduce after-sales costs.

[0013] The electrical equipment provided in this application has high safety performance by being equipped with the above-mentioned battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to explain the embodiments of the present application or the technical solutions in the related technologies more clearly and easily, a brief introduction is given below to the drawings required for use in the embodiments or the description of the related technologies. The drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] FIG1 is a schematic structural diagram of the front side of a battery pack provided in an embodiment of the present application;

[0016] FIG2 is a schematic structural diagram of a battery module provided in an embodiment of the present application;

[0017] FIG3 is a cross-sectional view of a liquid cooling plate provided in an embodiment of the present application;

[0018] FIG4 is a first structural diagram of the back side of a battery pack provided in an embodiment of the present application;

[0019] FIG5 is a schematic structural diagram of a box provided in an embodiment of the present application;

[0020] FIG6 is a second structural diagram of the back side of a battery pack provided in an embodiment of the present application;

[0021] FIG7 is a partial cross-sectional view of the battery pack provided in an embodiment of the present application.

[0022] In the picture:

[0023] 10. Box body; 11. Bottom guard plate; 12. Crossbeam; 13. Bracket; 14. Support plate; 15. First structural adhesive; 16. Second structural adhesive; 17. Foam;

[0024] 20. Battery module; 21. Battery cell; 22. Liquid cooling plate; 221. Battery body; 222. Current collector; 223. Liquid inlet nozzle; 224. Liquid outlet nozzle; 225. Flow channel;

[0025] 30. Liquid inlet pipe; 31. First quick connector;

[0026] 40. Liquid outlet pipe; 41. Second quick connector; 50. Protective cover. Modes for Carrying Out the Invention

[0027] As shown in Figures 1 to 4, this embodiment provides a battery pack, including a box body 10, a battery module 20, a liquid inlet pipe 30 and a liquid outlet pipe 40. The bottom of the box body 10 is provided with a bottom guard plate 11; the battery module 20 is arranged in the box body 10, and the battery module 20 includes a battery cell 21 and a liquid cooling plate 22 that is arranged in contact with the battery cell 21. The liquid cooling plate 22 is provided with a liquid inlet nozzle 223 and a liquid outlet nozzle 224. The liquid inlet nozzle 223 and the liquid outlet nozzle 224 both pass through the bottom guard plate 11 to the outside of the box body 10. The bottom guard plate 11 is provided with a liquid inlet nozzle 223 and a liquid outlet nozzle 224. 4 passes through the through hole; the liquid inlet pipe 30 and the liquid outlet pipe 40 are both arranged on the outside of the box body 10, the liquid inlet pipe 30 is connected to the output end of the cooling device, and the liquid outlet pipe 40 is connected to the input end of the cooling device. The liquid inlet pipe 30 is provided with a first quick connector 31, and the liquid outlet pipe 40 is provided with a second quick connector 41. The first quick connector 31 is connected to the liquid inlet nozzle 223, and the second quick connector 41 is connected to the liquid outlet nozzle 224. The liquid inlet pipe 30, the first quick connector 31, the liquid inlet nozzle 223, the liquid cooling plate 22, the liquid outlet nozzle 224, the second quick connector 41 and the liquid outlet pipe 40 are connected in sequence.

[0028] During operation, the coolant in the cooling device flows into the liquid cooling plate 22 through the liquid inlet pipe 30, the first quick connector 31 and the liquid inlet nozzle 223, dissipates heat from the battery cell 21 through heat exchange, and discharges the heat as the coolant flows. The discharged coolant flows into the liquid outlet pipe 40 through the liquid outlet nozzle 224 and the second quick connector 41, and finally flows back to the cooling device, thereby forming a liquid cooling circuit to reduce the temperature of the battery cell 21, and the cooling effect is good.

[0029] In this battery pack, the liquid inlet nozzle 223, first quick connector 31, liquid inlet tube 30, liquid outlet nozzle 224, second quick connector 41, and liquid outlet tube 40 are all located at the bottom of the housing 10, achieving a design with no pipe connections or quick connectors within the battery pack. Even if leakage occurs at the quick connectors, it only occurs on the outside of the battery pack, preventing internal leakage and damage to the battery pack, thereby increasing the battery pack's service life and safety. Furthermore, since the quick connectors are all located at the bottom of the battery pack, if a quick connector fails due to leakage, it can be quickly replaced on the outside of the battery pack without disassembling the entire battery pack, reducing after-sales costs.

[0030] 1 , there can be one or more battery modules 20. When there are multiple battery modules 20, the multiple battery modules 20 can be arranged along the X-axis direction, where the X-axis direction is the length direction of the box 10 and the Y-axis direction is the width direction of the box 10. As shown in FIG5 , multiple crossbeams 12 are also provided in the box 10. Each crossbeam 12 is provided parallel to the Y-axis. The multiple crossbeams 12 are spaced apart along the X-axis direction. The crossbeams 12 divide the space within the box 10 into multiple subspaces, each of which contains a battery module 20. When a battery module 20 in a subspace catches fire due to high temperature, the crossbeams 12 can separate the subspace where the battery module 20 that caught fire is located from the battery modules 20 in other subspaces, thereby reducing losses.

[0031] Specifically, referring to Figures 1 and 2, each battery module 20 includes a plurality of battery cells 21 and a plurality of liquid cooling plates 22. The battery cells 21 and the liquid cooling plates 22 are arranged alternately along the X-axis direction. That is, a liquid cooling plate 22 is provided between any two adjacent battery cells 21. The two sides of the liquid cooling plate 22 are respectively in contact with the battery cells 21 on the adjacent sides, thereby improving the cooling effect and making the battery module 20 have better temperature uniformity. Each liquid cooling plate 22 is respectively provided with a liquid inlet nozzle 223 and a liquid outlet nozzle 224. Correspondingly, the liquid inlet pipe 30 is provided with a plurality of first quick connectors 31 corresponding to the liquid inlet nozzles 223, and the liquid outlet pipe 40 is provided with a plurality of second quick connectors 41 corresponding to the liquid outlet nozzles 224. The bottom guard plate 11 is provided with a plurality of through holes for the corresponding liquid inlet nozzles 223 and liquid outlet nozzles 224 to pass through.

[0032] In this embodiment, the battery cell 21 is square, and the liquid cooling plate 22 is constructed as a flat plate structure. The liquid cooling plate 22 is fitted with the large surface of the battery cell 21 to increase the contact area between the liquid cooling plate 22 and each battery cell 21, thereby having a good cooling effect on the battery cell 21 and improving the heat dissipation effect.

[0033] Preferably, thermally conductive adhesive is applied between the liquid cooling plate 22 and the large surface of the battery cells 21. This adhesive reduces the contact thermal resistance between the liquid cooling plate 22 and the battery cells 21, improving heat conduction. Furthermore, it bonds the battery cells 21 to their corresponding liquid cooling plates 22, ensuring a stable and reliable structure.

[0034] Specifically, as shown in Figure 3, the liquid cooling plate 22 includes a main body 221 and a current collector 222. The main body 221 is provided with a flow channel 225 extending along the length direction; the current collector 222 is connected to the end of the main body 221, and the liquid inlet nozzle 223 and the liquid outlet nozzle 224 are provided on the current collector 222 and are respectively connected to the flow channel 225. The coolant enters the flow channel 225 of the liquid cooling plate 22 through the liquid inlet nozzle 223 to cool the battery cell 21. By flowing along the flow channel 225, the coolant transfers heat and is discharged through the liquid outlet nozzle 224, completing the cooling of the battery cell 21. Preferably, the flow channel 225 includes multiple sub-flow channels arranged in parallel along its height direction, so that the battery cell 21 has better temperature uniformity.

[0035] Preferably, as shown in FIG3 , the liquid cooling plate 22 includes two current collectors 222 . The main body 221 has a first end and a second end along its length (the Y-axis), respectively. The two current collectors 222 are disposed at the first and second ends, respectively. The current collector 222 at the first end is provided with a liquid inlet nozzle 223, and the current collector 222 at the second end is provided with a liquid outlet nozzle 224. In other words, the liquid inlet nozzle 223 and the liquid outlet nozzle 224 are located at the two ends of the liquid cooling plate 22 along the Y-axis. All the liquid inlet nozzles 223 in the battery module 20 are located at the first end, and all the liquid outlet nozzles 224 are located at the second end. On the back side of the bottom guard plate 11 of the housing 10, as shown in FIG4 , the liquid inlet pipe 30 and the liquid outlet pipe 40 are located on either side of the bottom guard plate 11 along the Y-axis, with all the first quick connectors 31 located on one side and all the second quick connectors 41 located on the other side. This arrangement optimizes the layout of the liquid cooling circuit, avoids excessive concentration of pipes resulting in clutter, and facilitates user management and monitoring of the cooling circuits.

[0036] As shown in Figure 6, a protective cover 50 is provided on the bottom side of the bottom guard plate 11. The protective cover 50 is provided on the outside of the liquid inlet pipe 30 and the liquid outlet pipe 40 and is fixedly connected to the bottom of the box body 10. Since the liquid inlet pipe 30 and the liquid outlet pipe 40 are provided on both sides, two protective covers 50 are provided, one of which is provided on the outside of the liquid inlet pipe 30 and the other is provided on the outside of the liquid outlet pipe 40. By providing the protective cover 50, the liquid inlet nozzle 223, the liquid outlet nozzle 224, the first quick connector 31, the second quick connector 41 and the corresponding pipelines located outside the box body 10 can be protected to prevent damage from external impact. At the same time, when a quick connector fails to leak, the protective cover 50 can be removed from the bottom of the battery pack to replace the quick connector without removing the battery pack, which facilitates management and maintenance.

[0037] Furthermore, as shown in Figures 5 and 7 , multiple brackets 13 are fixed to the inner side of the bottom guard plate 11. Each bracket 13 extends along the X-axis, and multiple brackets 13 are spaced apart along the Y-axis. Support plates 14 are provided on the brackets 13 to support the battery cells 21. This arrangement improves the structural strength of the bottom of the box 10, thereby stably supporting the battery module 20. A first structural adhesive 15 is provided between the support plate 14 and the bottom of the battery cell 21. The first structural adhesive 15 is used to bond the bottom of the battery cell 21 to the support plate 14 to ensure a stable connection between the two.

[0038] As shown in Figure 7, the second structural adhesive 16 is respectively filled between the bottom of both sides of the box body 10 along its width direction and the bottom of both sides corresponding to the battery module 20. The second structural adhesive 16 is used to adhere the two sides of the battery module 20 to the inner sides of the box body 10 to ensure a stable connection. At the same time, the second structural adhesive 16 can respectively seal between the liquid inlet nozzle 223 and the bottom guard plate 11, and between the liquid outlet nozzle 224 and the bottom guard plate 11 to achieve the purpose of waterproofing. It should be noted that Figure 7 only shows the structure of one side of the box body 10 and the battery module 20. The structure of the other side is the same as that side.

[0039] As shown in Figures 5 and 7, foam pads 17 are attached to the inner side of the bottom guard plate 11. The holes in the foam pads 17 correspond to the through-holes in the bottom guard plate 11. After the liquid inlet nozzle 223 and the liquid outlet nozzle 224 are inserted through the corresponding through-holes, the foam pads 17 on both sides are respectively arranged around the sides of the liquid inlet nozzle 223 and the liquid outlet nozzle 224. The provision of the foam pads 17 can prevent the glue from leaking out of the through-holes in the bottom guard plate 11 when the second structural adhesive 16 is injected.

[0040] The specific assembly process of the battery pack is as follows: 1) firstly, the liquid cooling plate 22 and the battery cell 21 are bonded together by means of thermal conductive adhesive to form a battery module 20; 2) then, corresponding through holes are opened on the bottom guard plate 11 according to the positions of the liquid inlet nozzle 223 and the liquid outlet nozzle 224, and then the foam 17 is attached to the bottom guard plate 11; 3) then, the first structural adhesive 15 is applied to the support plate 14, and the battery module 20 is placed on the support plate 14, with the liquid inlet nozzle 223 and the liquid outlet nozzle 224 of the liquid cooling plate 22 passing through the bottom guard plate 11 downward. The through holes of the protective plate 11 are connected to the outside of the box body 10; 4) Then, the second structural adhesive 16 is poured into both sides of the interior of the box body 10 to adhere the battery module 20 to the side of the box body 10; 5) After that, each first quick connector 31 on the liquid inlet pipe 30 is connected to the corresponding liquid inlet nozzle 223, and each second quick connector 41 on the liquid outlet pipe 40 is connected to the corresponding liquid outlet nozzle 224 to form a liquid cooling circuit; 6) Finally, the protective cover 50 is fixed to the bottom surface of the bottom protective plate 11.

[0041] This embodiment also provides an electrical device, including the above-mentioned battery pack, which can provide electrical energy to the electrical device. The electrical device can be an electric vehicle, a hybrid electric vehicle, or a ship. In some embodiments, the electrical device is an electric vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range vehicle. In other embodiments, the electrical device can also be other devices, which are not specifically limited here. The electrical device provided in this embodiment has high safety performance by being provided with the above-mentioned battery pack.

Claims

1. Battery pack, comprising: A box body (10), with a bottom guard plate (11) provided at the bottom of the box body (10); A battery cell (21) and a liquid cooling plate (22) attached to the battery cell (21), both arranged inside the box body (10). The liquid cooling plate (22) is provided with a liquid inlet nozzle (223) and a liquid outlet nozzle (224), and both the liquid inlet nozzle (223) and the liquid outlet nozzle (224) penetrate through the bottom guard plate (11) to the outside of the box body (10); A liquid inlet pipe (30) and a liquid outlet pipe (40), arranged outside the box body (10). The liquid inlet pipe (30) is provided with a first quick connector (31), and the liquid outlet pipe (40) is provided with a second quick connector (41). The first quick connector (31) is connected to the liquid inlet nozzle (223), and the second quick connector (41) is connected to the liquid outlet nozzle (224).

2. The battery pack according to claim 1, wherein, The liquid cooling plate (22) includes: A main body (221), inside which there is a flow channel (225) extending along the length direction; A current collector (222), connected to the end of the main body (221). The liquid inlet nozzle (223) and the liquid outlet nozzle (224) are arranged on the current collector (222) and are respectively communicated with the flow channel (225).

3. The battery pack according to claim 2, wherein, The liquid cooling plate (22) includes two current collectors (222). The two ends of the main body (221) along its length direction are respectively a first end and a second end. The two current collectors (222) are respectively arranged at the first end and the second end. The liquid inlet nozzle (223) is arranged on the current collector (222) at the first end, and the liquid outlet nozzle (224) is arranged on the current collector (222) at the second end.

4. The battery pack according to any one of claims 1 to 3, wherein, The battery pack includes a plurality of the battery cells (21) and a plurality of the liquid cooling plates (22). The battery cells (21) and the liquid cooling plates (22) are alternately arranged in sequence along the length direction of the box body (10) to form a battery module (20), and the liquid cooling plate (22) is attached to the large surface of the battery cell (21).

5. The battery pack according to claim 4, wherein, There is a thermal conductive adhesive between the large surface of the liquid cooling plate (22) and the battery cell (21).

6. The battery pack according to claim 4, wherein, On both sides of the bottom inside the box body (10) along its width direction, second structural adhesives (16) are respectively filled between the corresponding two sides of the bottom of the battery module (20).

7. The battery pack according to any one of claims 1 to 3, wherein, A foam (17) is attached to the inner side of the bottom guard plate (11), and the foam (17) surrounds the peripheries of the liquid inlet nozzle (223) and the liquid outlet nozzle (224).

8. The battery pack according to any one of claims 1 to 3, wherein, A bracket (13) is fixed to the inner side of the bottom guard plate (11). A support plate (14) is arranged on the bracket (13), and the support plate (14) is used to support the battery cell (21). There is a first structural adhesive (15) between the support plate (14) and the bottom of the battery cell (21).

9. The battery pack according to any one of claims 1 to 3, wherein, A protective cover (50) is provided on the bottom side of the bottom guard plate (11), and the protective cover (50) covers the outside of the liquid inlet pipe (30) and the liquid outlet pipe (40).

10. An electrical equipment, comprising the battery pack according to any one of claims 1 to 9.