Liquid-cooled battery pack and energy storage system

Abstract

The utility model discloses a liquid-cooled battery pack and an energy storage system. The liquid-cooled battery pack comprises a cooling piece, a battery pack and an energy storage module, at least two battery modules, wherein the cooling piece is arranged between two adjacent battery modules; the battery module is arranged in the box body, and the heat dissipation surface of the cooling piece is not in contact with the inner wall of the box body. According to the scheme provided by the invention, the cooling piece is arranged between the two adjacent battery modules, so that the cooling capacity generated by the cooling piece can be transferred to the two corresponding battery modules through the upper surface and the lower surface, and the cooling capacity of the lower surface of the cooling piece is prevented from being transferred to the box body, so that the box body is prevented from being condensed when encountering hot air; therefore, the problem of rusting of the box body is avoided, and the safety of the whole liquid-cooled battery pack is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of storage batteries, and in particular to a liquid-cooled battery pack and an energy storage system. Background Art

[0002] With the rapid development of the new energy industry, the development momentum of new energy vehicles is very good. New energy vehicles mainly use battery packs to provide power for vehicle driving.

[0003] When the shell of an existing liquid-cooled battery pack encounters hot air, condensation may occur, which may easily cause the shell to rust and reduce the safety performance of the liquid-cooled battery pack. Utility Model Content

[0004] The main purpose of this application is to provide a liquid-cooled battery pack that can solve the problem of condensation on the outer casing, and then solve the problem of rust on the outer casing and reduced safety.

[0005] To achieve the above objectives, the present application proposes a liquid-cooled battery pack, comprising:

[0006] Cooling parts;

[0007] At least two battery modules, the cooling element is arranged between two adjacent battery modules;

[0008] The battery module is arranged in the box body, and the heat dissipation surface of the cooling element does not contact the inner wall of the box body.

[0009] In one of the embodiments, the cooling member comprises a cooling plate, a cold liquid cavity is provided inside the cooling plate, a first port and a second port are provided on the cooling plate, and the first port and the second port are respectively connected to the cold liquid cavity.

[0010] In one of the embodiments, the system further includes a first solenoid valve, wherein the first solenoid valve is disposed on the first port.

[0011] In one of the embodiments, the device further includes a second solenoid valve, wherein the second solenoid valve is disposed on the second port.

[0012] In one of the embodiments, a quick connector is further included, and the quick connector is arranged on the first port.

[0013] In one embodiment, the cooling plate is composed of a plurality of plate bodies.

[0014] In one of the embodiments, a slot for fixing the battery module is provided on the cooling plate.

[0015] In one of the embodiments, a heat conducting plate is further included, and the heat conducting plate is arranged between the cooling element and the battery module.

[0016] In one of the embodiments, a heat insulation layer is further included, and the heat insulation layer is arranged on the inner wall of the box body.

[0017] The present application also provides an energy storage system, comprising a liquid-cooled battery pack as described in any one of the embodiments of the present application.

[0018] The liquid-cooled battery pack provided in the present application has a cooling element disposed between two battery modules. Therefore, the cold energy generated by the cooling element will be transferred to the corresponding two battery modules through the upper and lower surfaces, thereby preventing the cold energy on the lower surface of the cooling element from being transferred to the box body, thereby preventing condensation on the box body when encountering hot air, and further preventing the box body from rusting, thereby effectively improving the safety of the overall liquid-cooled battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure of a liquid-cooled battery pack provided in one embodiment of the present application.

[0021] Description of Figure Numbers:

[0022] Label name Label name 10 Cooling parts 20 First battery module 101 First Port 30 Second battery module 102 Second Port

[0023] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0027] The inventors of the present application analyzed and found that when condensation occurs on the outer shell of a liquid-cooled battery pack, the outer shell is likely to rust, thereby reducing the safety performance of the liquid-cooled battery pack. The inventors further studied the condensation phenomenon and found that the condensation phenomenon is basically due to the fact that the battery cells in the liquid-cooled battery pack are directly placed on the upper surface of the liquid cooling plate, and the lower surface of the liquid cooling plate is directly in contact with the outer shell of the liquid-cooled battery pack. When the liquid-cooled battery pack is working in a high-temperature environment, the cold on the upper surface of the liquid cooling plate can be directly taken away by the heated battery cells, while the cold on the lower surface of the liquid cooling plate can only be transferred to the outer shell. Condensation occurs when the outer shell encounters hot air.

[0028] Therefore, the embodiments of this specification propose a liquid-cooled battery pack, such as Figure 1 As shown, the liquid-cooled battery pack includes: a cooling member 10, at least two battery modules and a box body, wherein the cooling member 10 is arranged between two adjacent battery modules, the battery module is arranged in the box body, and the heat dissipation surface of the cooling member 10 does not contact the inner wall of the box body.

[0029] Exemplarily, the present embodiment includes two battery modules, namely a first battery module 20 and a second battery module 30, each battery module includes a plurality of battery cells, and the cooling member 10 is disposed between the first battery module 20 and the second battery module 30. The box body includes a box cover and a storage shell, the storage shell has a hollow structure inside, one side of the storage shell has an open structure, and the box cover is hinged at the opening of the storage shell. The box cover and the storage shell are arranged to form a cavity for placing the battery module.

[0030] In this embodiment, the cooling element 10 may be a water cooling plate, a liquid cooling plate, etc., which may be specifically determined according to actual conditions, and the embodiments of this specification do not limit this.

[0031] By adopting the above technical solution, since the cooling element 10 is arranged between the two battery modules, the cold energy generated by the cooling element 10 will be transferred to the corresponding two battery modules through the upper and lower surfaces, thereby preventing the cold energy on the lower surface of the cooling element 10 from being transferred to the box body, thereby preventing condensation on the box body when encountering hot air, and further avoiding the problem of rust on the box body, thereby effectively improving the safety of the overall liquid-cooled battery pack.

[0032] Furthermore, since the cooling element 10 can lower the temperature of the battery module, more battery cells can be arranged in each battery module within a unit space, thereby improving the energy density of the battery module.

[0033] In some embodiments, Figure 1 As shown, the cooling member 10 includes a cooling plate, a cooling liquid cavity is provided inside the cooling plate, a first port 101 and a second port 102 are provided on the cooling plate, and the first port 101 and the second port 102 are respectively connected to the cooling liquid cavity.

[0034] In this embodiment, the cooling plate may be a rectangular parallelepiped or cube structure, and the interior of the cooling plate is a hollow structure. The first port 101 and the second port 102 may be integrally formed with the cooling plate, or may be threadedly connected to the cooling plate.

[0035] When the cooling plate is in use, the cooling liquid is injected into the cooling liquid cavity in the cooling plate from the first port 101, and the liquid with high temperature in the cooling liquid cavity is discharged from the second port 102, thereby ensuring that the cooling liquid in the cooling plate is in a circulating state.

[0036] In this embodiment, due to the provision of the first port 101 , it is convenient to inject the coolant into the cooling plate, and due to the provision of the second port 102 , it is convenient to discharge the liquid in the cooling plate.

[0037] In some embodiments, the liquid-cooled battery pack further includes a first solenoid valve, which is disposed on the first port 101 .

[0038] In this embodiment, the first port 101 is provided with a first solenoid valve, so as to conveniently control the opening or closing of the first port 101. Of course, it is understandable that this embodiment may also be provided with other structures to block the first port 101, such as a rubber stopper, a ball valve, etc., which are not limited here.

[0039] In some embodiments, the liquid-cooled battery pack further includes a second solenoid valve disposed on the second port 102 .

[0040] In this embodiment, since the second solenoid valve is provided in the second port 102, it is convenient to control the opening or closing of the second port 102. Of course, it is understandable that other structures can also be provided in this embodiment to block the second port 102, such as rubber plugs, ball valves, etc., which are not limited here.

[0041] In some embodiments, the liquid-cooled battery pack further includes a quick connector, which is disposed on the first port 101 .

[0042] In this embodiment, since a quick connector is provided on the first port 101, it is convenient to connect an external liquid injection tube to the first port 101, thereby facilitating the injection of coolant into the cooling plate.

[0043] In some embodiments, the cooling plate is composed of a plurality of plate bodies.

[0044] For example, the cooling plate in this embodiment includes four plates, and each plate can be snapped together. For example, the area of ​​one side of each plate in contact with the battery cell is 0.5㎡, so the area of ​​one side of the cooling plate formed by the combination of four plates in contact with the battery cell is 2㎡. Of course, it can be understood that the cooling plate can include five, eight, etc. plates, and the area of ​​one side of each plate in contact with the battery cell can be equal or unequal.

[0045] In this way, when the cooling plate is placed under the first battery module 20, the size of the cooling plate can be adjusted according to the size of the contact area between the cooling plate and the first battery module 20 to avoid the cooling plate being too large or too small, which is beneficial to cooling the first battery module 20.

[0046] In some embodiments, a slot for fixing the battery module is provided on the cooling plate.

[0047] In this embodiment, bosses are provided on the edges around the cooling plate, and a slot is formed between the bosses and the upper surface of the cooling plate. When the battery module is placed on the cooling plate, the periphery of the battery module abuts against the bosses, so that the battery module can be stably located on the cooling plate.

[0048] In some embodiments, the liquid-cooled battery pack further includes a heat conductive plate disposed between the cooling element 10 and the battery module.

[0049] In this embodiment, the heat conducting plate can be a stainless steel plate, etc., which is not limited here. Since the heat conducting plate is arranged between the cooling member 10 and the battery module, the heat generated in the battery module can be quickly transferred to the cooling member 10, which is conducive to the rapid cooling of the battery module.

[0050] In some embodiments, the liquid-cooled battery pack further includes a thermal insulation layer, which is disposed on the inner wall of the box body.

[0051] In this embodiment, the heat insulation layer can be a heat preservation film, etc., which is not limited here. Since the heat insulation layer is arranged on the inner wall of the box, it can prevent the external high-temperature airflow from flowing into the box from the outside of the box, thereby affecting the temperature of the battery module inside the box.

[0052] The present application also provides an energy storage system, including a liquid-cooled battery pack as in any one of the embodiments of the present application. The specific structure of the liquid-cooled battery pack in this embodiment refers to the above embodiment. Since the energy storage system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0053] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the application concept of the present application, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A liquid-cooled battery pack, characterized in that: include: Cooling element (10); At least two battery modules, the cooling element (10) being arranged between two adjacent battery modules; A box body, the battery module is arranged in the box body, and the heat dissipation surface of the cooling element (10) does not contact the inner wall of the box body.

2. The liquid-cooled battery pack according to claim 1, characterized in that: The cooling element (10) comprises a cooling plate, a cold liquid cavity is provided inside the cooling plate, a first port (101) and a second port (102) are provided on the cooling plate, and the first port (101) and the second port (102) are respectively connected to the cold liquid cavity.

3. The liquid-cooled battery pack according to claim 2, characterized in that: It also includes a first solenoid valve, which is arranged on the first port (101).

4. The liquid-cooled battery pack according to claim 2, characterized in that: It also includes a second solenoid valve, which is arranged on the second port (102).

5. The liquid-cooled battery pack according to claim 2, characterized in that: It also includes a quick connector, which is arranged on the first port (101).

6. The liquid-cooled battery pack according to claim 2, characterized in that: The cooling plate is composed of a plurality of plate bodies.

7. The liquid-cooled battery pack according to claim 2, characterized in that: The cooling plate is provided with a slot for fixing the battery module.

8. The liquid-cooled battery pack according to any one of claims 1 to 7, characterized in that: It also includes a heat conducting plate, which is arranged between the cooling element (10) and the battery module.

9. The liquid-cooled battery pack according to any one of claims 1 to 7, characterized in that: It also includes a heat insulation layer, which is arranged on the inner wall of the box body.

10. An energy storage system, characterized in that: Comprising a liquid-cooled battery pack as described in any one of claims 1-9.

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