Battery pack and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack and electric equipment. The battery pack comprises a battery cell module, a first liquid cooling plate, a second liquid cooling plate and a BDU module, wherein the battery cell module comprises a plurality of single battery cells stacked in the horizontal direction; the first liquid cooling plate is arranged at the bottom of the battery cell module; the second liquid cooling plate is arranged at the top of the battery cell module; the BDU module is arranged on the top wall of the second liquid cooling plate, the BDU module is provided with a BDU cold plate, the BDU module is used for being electrically connected with a charging station, one end of the BDU cold plate is communicated with the liquid cooling module of the charging station, and the other end of the BDU cold plate is communicated with the second liquid cooling plate. According to the battery pack, the heat dissipation performance of the battery pack during charging can be improved, so that the battery pack can be charged with higher power, and the use reliability of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery pack and electrical equipment. BACKGROUND

[0002] With the rapid rise of new energy vehicle market share, the endurance mileage and charging efficiency have become the double test of industry progress. While the endurance mileage is significantly improved, the expansion of battery capacity brings the challenge of prolonged charging time. As an important link in the electric vehicle industry chain, the performance and efficiency of charging technology directly affect the popularization and application of electric vehicles, and the high-power fast charging technology brings a revolutionary breakthrough to the charging experience of electric vehicles.

[0003] When the automobile is charged at high power, the heat accumulation and temperature rise caused by charging have become a technical problem that needs to be solved urgently. In the prior art, liquid cooling technology is attracting attention due to its excellent heat dissipation performance. Through the circulating cooling liquid, the liquid cooling technology can quickly take away the heat generated during the charging process, so as to ensure that the charging equipment can still maintain stable performance under the condition of continuous high-power working state. At present, when high-power charging is carried out, the liquid cooling method is usually used to cool the charging station, charging gun and cable, and the cooling demand of the battery pack is not considered. The bottom cooling method is used in the battery pack, and the heat dissipation effect is limited, which cannot meet the cooling demand of the battery pack when high-power charging. Some battery packs use the way of cooling the large face of the battery cell, that is, a liquid cooling plate is arranged on the large face of the circumferential side wall of the battery cell to cool and dissipate heat. Although this way can improve the heat dissipation performance of the battery pack, the cooling liquid pipeline and parts increase, which increases the risk of liquid leakage of the liquid cooling plate, and the deformation problem of the liquid cooling plate after the expansion of the battery cell needs to be considered, which increases the complexity of assembly. Due to the increase of parts, the space utilization rate of the battery pack is reduced.

[0004] Therefore, it is urgent to provide a new type of battery pack and electrical equipment to solve the above technical problems in the prior art. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a battery pack, which can improve the heat dissipation performance of the battery pack during charging, so that the battery pack can be charged at a larger power, and the use reliability of the battery pack is improved.

[0006] To achieve this purpose, the utility model adopts the following technical scheme:

[0007] The battery pack comprises a cell module, a first liquid cooling plate, a second liquid cooling plate and a BDU module, the cell module comprises a plurality of single cells stacked in a horizontal direction; the first liquid cooling plate is arranged at the bottom of the cell module; the second liquid cooling plate is arranged at the top of the cell module; the BDU module is arranged on the top wall of the second liquid cooling plate, the BDU module is provided with a BDU cooling plate, the BDU module is electrically connected with a charging station, one end of the BDU cooling plate is communicated with a liquid cooling module of the charging station, and the other end is communicated with the second liquid cooling plate.

[0008] Optionally, the top of the cell module is provided with a busbar, the busbar is in conductive connection with the cell module, and the second liquid cooling plate abuts against the top wall of the busbar.

[0009] Optionally, the second liquid cooling plate and the busbar are filled with a heat-conducting adhesive.

[0010] Optionally, the surface of the second liquid cooling plate is provided with an insulating layer.

[0011] Optionally, the second liquid cooling plate is provided with a relief hole, and the relief hole is used for avoiding an explosion-proof valve of the single cell.

[0012] Optionally, the battery pack further comprises a box body, and the first liquid cooling plate is welded to the bottom of the box body.

[0013] Optionally, the box body comprises a bottom guard plate arranged at the bottom, and a buffer is arranged between the bottom guard plate and the first liquid cooling plate.

[0014] Optionally, the circumferential side wall of the box body is provided with a liquid inlet interface and a liquid outlet interface, and the liquid inlet interface and the liquid outlet interface are communicated with the first liquid cooling plate.

[0015] Optionally, the thickness of the second liquid cooling plate is not greater than 5 mm.

[0016] Optionally, the BDU cooling plate is communicated with the second liquid cooling plate through a connecting pipeline.

[0017] Another purpose of the utility model is to provide a kind of electric equipment, and the electric equipment includes the battery pack as described in any of the above solutions.

[0018] Beneficial effects:

[0019] The battery pack in the utility model is provided with the first liquid cooling plate arranged at the bottom of the battery cell module and the second liquid cooling plate arranged at the top of the battery cell module, so that the top and bottom of the battery cell module in the battery pack can be cooled at the same time, the second liquid cooling plate is connected with the BDU cooling plate of the BDU module, and when the BDU module is electrically connected with the charging station to charge the battery pack, the BDU cooling plate is connected with the liquid cooling plate module of the charging station, so that the liquid cooling module of the charging station circulates the cooling medium of the BDU cooling plate and the second liquid cooling plate, thereby cooling the top of the BDU module and the battery cell module; when the battery pack is normally used, the second liquid cooling plate does not need to be started, and only the first liquid cooling plate is used to cool the battery pack, so that the circulation of the cooling liquid in the first liquid cooling plate is not affected, and the cooling capacity of the first liquid cooling plate is not affected. The battery pack can improve the heat dissipation performance when the battery pack is charged, so that the battery pack can be charged at a greater power, and the heat dissipation performance of the battery pack when normally used is not affected, and the use reliability of the battery pack is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the isometric view of the battery pack provided by the embodiment of the utility model;

[0021] Figure 2 is the exploded view of the battery pack provided by the embodiment of the utility model.

[0022] In the drawing:

[0023] 100, battery cell module; 101, single battery cell; 102, busbar; 200, first liquid cooling plate; 300, second liquid cooling plate; 310, avoiding hole; 400, BDU module; 410, BDU cooling plate; 420, connecting pipeline; 500, box body; 501, liquid inlet; 502, liquid outlet. DETAILED DESCRIPTION

[0024] The utility model will be further explained in detail in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all the structures.

[0025] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0026] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0027] In the description of the present embodiment, the terms "upper", "lower", "right", "left", etc. orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0028] Please refer to Figure 1 and Figure 2 In the present embodiment, the battery pack includes a cell module 100, a first liquid cooling plate 200, a second liquid cooling plate 300 and a BDU module 400. The cell module 100 includes a plurality of single cells 101 stacked in the horizontal direction. The first liquid cooling plate 200 is arranged at the bottom of the cell module 100. The second liquid cooling plate 300 is arranged at the top of the cell module 100. The BDU module 400 is arranged on the top wall of the second liquid cooling plate 300. The BDU module 400 is provided with a BDU cooling plate 410. The BDU module 400 is electrically connected to the charging station. One end of the BDU cooling plate 410 is communicated with the liquid cooling module of the charging station, and the other end is communicated with the second liquid cooling plate 300.

[0029] The battery pack in the embodiment sets the first liquid cooling plate 200 at the bottom of the battery cell module 100 and sets the second liquid cooling plate 300 at the top of the battery cell module 100, so as to realize the simultaneous heat dissipation of the top and bottom of the battery cell module 100 in the battery pack. The second liquid cooling plate 300 at the top is connected with the BDU cooling plate 410 of the BDU module 400. When the BDU module 400 is electrically connected with the charging station for charging the battery pack, the BDU cooling plate 410 is connected with the liquid cooling plate module of the charging station, so that the liquid cooling module of the charging station circulates the cooling medium of the BDU cooling plate 410 and the second liquid cooling plate 300, thereby cooling the top of the BDU module 400 and the battery cell module 100. When the battery pack is used normally, the second liquid cooling plate 300 does not need to be started, and only the first liquid cooling plate 200 is used to cool the battery pack, so as to avoid affecting the circulation of the cooling liquid in the first liquid cooling plate 200 and ensure that the cooling capacity of the first liquid cooling plate 200 is not affected. The battery pack can improve the heat dissipation performance when the battery pack is charged, so that the battery pack can be charged at a greater power without affecting the heat dissipation performance when the battery pack is used normally, thereby improving the use reliability of the battery pack.

[0030] The charging station in the embodiment includes a power module, a liquid cooling charging gun, a liquid cooling cable, a liquid cooling module and the like. The cooling module, that is, the thermal management system of the charging station, includes a circulating pump, a liquid storage tank, a radiator and the like. The liquid cooling charging gun is plugged into the charging socket of the automobile battery pack. The power module can charge the battery pack through the liquid cooling cable. At this time, the liquid cooling module can also inject the cooling liquid into the BDU cooling plate 410 through the liquid cooling cable, so as to cool the top of the BDU module 400 and the battery cell module 100, thereby realizing the active cooling when the battery pack is charged.

[0031] The BDU module 400 is a battery distribution unit of the battery pack. The full name is Battery Distribution Unit. It is an important part of the power battery management system of the electric vehicle. The BDU module 400 is mainly responsible for the power distribution, protection and management of the battery pack, and ensures the safe and efficient operation of the battery pack. Details are not repeated here.

[0032] In the embodiment, the top of the battery cell module 100 is provided with a busbar 102. The busbar 102 is in conductive connection with the battery cell module 100. The second liquid cooling plate 300 is in heat exchange connection with the busbar 102. When the battery is charged, the connection between the busbar 102 and the single battery cell 101 generates the most serious heat. The use of the second liquid cooling plate 300 to dissipate heat from the busbar 102 avoids the accumulation of heat and improves the reliability of the battery pack when charging, thereby improving the charging power of the battery pack.

[0033] Further, the second liquid cooling plate 300 and the busbar 102 are filled with a heat-conducting adhesive. The heat-conducting adhesive can improve the heat conductivity between the second liquid cooling plate 300 and the busbar 102, and improve the cooling effect of the second liquid cooling plate 300 on the busbar 102.

[0034] As a preferred embodiment, the second liquid cooling plate 300 is provided with an insulating layer. The insulating layer can prevent short circuit between the second liquid cooling plate 300 and the busbar 102, or between the second busbar 102 and the battery management component such as the BDU module 400, thereby improving the use reliability of the battery pack.

[0035] Optionally, the thickness of the second liquid cooling plate 300 is not greater than 5 mm. The thickness of the second liquid cooling plate 300 not greater than 5 mm can prevent the second liquid cooling plate 300 from occupying too much space in the vertical direction of the battery pack, and can prevent the energy density of the battery pack from being affected, thereby improving the use performance and endurance of the battery pack.

[0036] In this embodiment, the BDU cooling plate 410 is in communication with the second liquid cooling plate 300 through the connecting pipeline 420. Specifically, the connecting pipeline 420 is provided with an interface connected with the charging station liquid cooling module, so as to realize parallel connection between the BDU cooling plate 410 and the second liquid cooling plate 300, and ensure that the cooling effects of the two do not affect each other.

[0037] Specifically, the second liquid cooling plate 300 is provided with an avoiding hole 310 for avoiding the explosion-proof valve of the single battery cell 101, so as to prevent the explosion-proof pressure relief of the single battery cell 101, and ensure the use safety and reliability of the battery pack.

[0038] Please continue to refer to Figure 1 and Figure 2 The battery pack further includes a box body 500, and the first liquid cooling plate 200 is welded to the bottom of the box body 500. The first liquid cooling plate 200 and the box body 500 are fixed by welding, which is simple to operate, has lower manufacturing cost, and is a relatively mature connection method in the prior art, thereby improving the yield of the battery pack.

[0039] In this embodiment, the box body 500 includes a bottom guard plate arranged at the bottom, and a buffer is arranged between the bottom guard plate and the first liquid cooling plate 200. The bottom guard plate is used to protect the bottom of the battery cell module 100 and the liquid cooling plate in the battery pack, so as to prevent the battery pack from being affected by the impact of foreign objects, and prevent the battery cell module 100 and the liquid cooling plate from leaking liquid and causing thermal runaway after being impacted, thereby improving the use reliability of the battery pack.

[0040] As a preferred embodiment, the circumferential side wall of the box body 500 is provided with a liquid inlet interface 501 and a liquid outlet interface 502, and the liquid inlet interface 501 and the liquid outlet interface 502 are respectively communicated with the first liquid cooling plate 200. By arranging the liquid inlet outlet and the liquid outlet outlet on the circumferential side wall of the box body 500 of the battery pack, the cooling medium can be smoothly introduced into the first liquid cooling plate 200, and the cooling effect of the first liquid cooling plate 200 is improved.

[0041] The embodiment also provides a power utilization device including the battery pack according to any one of the above solutions. The power utilization device has all the beneficial effects of the battery pack according to the above solutions, which will not be repeated here. The power utilization device can be an electric bicycle, an electric vehicle, a hybrid vehicle, a ship, an energy storage device, etc., as long as it uses electric energy as the energy source, which will not be repeated here. The power utilization device uses the first liquid cooling plate 200 and the second liquid cooling plate 300 to dissipate heat from the battery cell module 100 when charging. The second liquid cooling plate 300 uses the liquid cooling system of the charging station, which can improve the charging power and has better heat dissipation performance when charging. When the power utilization device is normally used for discharging, the second liquid cooling plate 300 does not need to be activated, and only the first liquid cooling plate 200 is used to cool the battery pack, avoiding affecting the circulation of the cooling liquid in the first liquid cooling plate 200 and ensuring that the cooling capacity of the first liquid cooling plate 200 is not affected.

[0042] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery pack, characterized by, The battery pack comprises: an electric core module (100) comprising a plurality of single electric core (101) stacked in a horizontal direction; a first liquid cooling plate (200) arranged at the bottom of the electric core module (100); a second liquid cooling plate (300) arranged at the top of the electric core module (100); a BDU module (400) arranged at the top wall of the second liquid cooling plate (300), the BDU module (400) being provided with a BDU cooling plate (410), the BDU module (400) being electrically connected with a charging station, one end of the BDU cooling plate (410) being communicated with a liquid cooling module of the charging station, and the other end being communicated with the second liquid cooling plate (300).

2. The battery pack of claim 1, wherein, The top of the electric core module (100) is provided with a busbar (102) which is electrically connected with the electric core module (100), and the second liquid cooling plate (300) abuts against the top wall of the busbar (102).

3. The battery pack of claim 2, wherein, Thermal conductive glue is filled between the second liquid cooling plate (300) and the busbar (102).

4. The battery pack of claim 2, wherein, An insulating layer is arranged on the surface of the second liquid cooling plate (300).

5. The battery pack of claim 2, wherein, The second liquid cooling plate (300) is provided with an avoiding hole (310) for avoiding the explosion-proof valve of the single electric core (101).

6. The battery pack of claim 1, wherein, The battery pack further comprises a box body (500), and the first liquid cooling plate (200) is welded to the bottom of the box body (500).

7. The battery pack of claim 6, wherein, The box body (500) comprises a bottom guard plate arranged at the bottom, and a buffer is arranged between the bottom guard plate and the first liquid cooling plate (200).

8. The battery pack of claim 6, wherein, The circumferential side wall of the box body (500) is provided with a liquid inlet interface (501) and a liquid outlet interface (502), and the liquid inlet interface (501) and the liquid outlet interface (502) are respectively communicated with the first liquid cooling plate (200).

9. The battery pack of any one of claims 1-8, wherein, The thickness of the second liquid cooling plate (300) is not greater than 5mm.

10. The battery pack of any one of claims 1-8, wherein, The BDU cooling plate (410) is communicated with the second liquid cooling plate (300) through a connecting pipeline (420).

11. An electrical device, characterized by The battery pack comprises the battery pack according to any one of claims 1-10.

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