Liquid-cooled battery pack

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a liquid-cooled battery pack. The liquid-cooled battery pack comprises a first battery cell unit, a second battery cell unit, a first liquid-cooled plate and a second liquid-cooled plate. According to the battery pack, the battery cells are unitized, so that batch battery cells which are integrally reinforced can be quickly loaded into the battery pack, the mounting process of the battery pack can be more reasonable, reliable, safe and efficient, and the battery pack is particularly suitable for a multi-layer battery with a single-layer module consisting of more battery cells. When the battery cells are integrated into the unit, a thermal management strategy can be more effectively implemented, and the multiple split type second liquid cooling plates are arranged, so that the consistency of the temperature of the battery cells is ensured, and the service life of the battery is prolonged. By optimizing the design of the battery cell units, the space utilization rate of the battery pack can be improved, and especially when a multi-layer module structure is adopted, the internal space of the battery pack can be utilized more efficiently.

Description

Technical Field

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

[0002] In existing battery packs, whether it is a cell module structure or a cell CTP structure, the liquid cooling plate is usually arranged on the lower surface of the cell. Heat is transferred between the liquid cooling plate and the cell through thermal conductive structural adhesive. The liquid cooling plate structure is mainly a single-layer liquid cooling plate structure.

[0003] Existing liquid cooling plates come in various forms, but all have certain defects: the contact area between a single-layer liquid cooling plate and the battery cell is limited; the flow uniformity of the medium in a multi-channel liquid cooling plate is difficult to control, and uneven flow is prone to occur, affecting the heat dissipation efficiency.

[0004] Chinese patent CN202123422614.3 discloses a double-layer module for power batteries with a liquid cooling system, including an upper module, a lower module, an upper support plate and a lower support plate. The upper module and the lower module have the same structure; the upper module is provided with an upper liquid cooling plate and an upper cover plate, and the lower module is provided with a lower liquid cooling plate and a lower cover plate. It is a double-layer module structure. It can not only ensure effective insulation and flame retardancy between batteries, but also ensure the thermal management reliability and structural stability of the module. Compared with traditional battery modules, the double-layer module has a compact structure on the one hand, which greatly improves the space utilization of the battery system. On the other hand, it has the advantages of small size, light weight and high versatility.

[0005] However, the multi-layer module battery in the prior art, such as the above-mentioned patent, still has the following problems: First, when a single-layer module is composed of a large number of battery cells, the degree of modularization between each layer of modules and the liquid cooling plate is low, the installation difficulty is high, and the installation stability is insufficient; Second, the liquid inlet and outlet of the liquid cooling plate occupy a large space.

[0006] Therefore, providing a better liquid-cooled battery pack is a technical problem that needs to be solved urgently in this field. Utility Model Content

[0007] In view of the existing phenomenon, the present invention provides a liquid-cooled battery pack to solve at least one of the above technical problems.

[0008] The technical solution provided in this application is a liquid-cooled battery pack, comprising: a first battery cell unit, a second battery cell unit, a first liquid cooling plate and a second liquid cooling plate; the first battery cell unit and the second battery cell unit both include an end plate and a battery cell fixed to the inner side of the end plate; multiple first battery cell units are arranged on the first liquid cooling plate, and the first liquid cooling plate is arranged as an integral whole; multiple second liquid cooling plates are arranged on the side of the first battery cell unit away from the first liquid cooling plate, and the second battery cell units are arranged on the second liquid cooling plate.

[0009] Furthermore, the number of battery cells in the first battery cell unit is greater than the number of battery cells in the second battery cell unit.

[0010] Furthermore, the size of the second liquid cooling plate corresponds to a first battery core unit, and the liquid inlet and the liquid outlet of the second liquid cooling plate are arranged on the upper surface.

[0011] Furthermore, the second liquid cooling plate includes a support frame that can be used to support the second battery cell unit.

[0012] Furthermore, the support frame and the end plate are screwed together through rivet nuts.

[0013] Furthermore, an insulating sheet for preventing short circuit of the battery cells is provided on the first liquid cooling plate and / or the second liquid cooling plate.

[0014] Furthermore, the liquid cooling media of the first liquid cooling plate and the second liquid cooling plate are connected in parallel, and the liquid cooling media of multiple second liquid cooling plates in the same layer are connected in series.

[0015] Furthermore, the first liquid cooling plate and the second liquid cooling plate both have single flow channels.

[0016] Furthermore, the first liquid cooling plate and / or the second liquid cooling plate are made of aluminum.

[0017] Furthermore, it includes alternately stacked second liquid cooling plate layers and second battery core unit layers.

[0018] The beneficial effects of this application are at least:

[0019] This application sets up the battery cells in units, which is conducive to quickly loading the batch of battery cells that have been reinforced as a whole into the battery pack, making the installation process of the battery pack more reasonable, reliable, safe and efficient. It is especially suitable for multi-layer batteries with a single-layer module consisting of more battery cells. When the battery cells are integrated into the unit, the thermal management strategy can be implemented more effectively. This application sets up multiple split second liquid cooling plates to ensure the consistency of the battery cell temperature and extend the battery life. By optimizing the design of the battery cell unit, the space utilization of the battery pack can be improved, especially when using a multi-layer module structure, the internal space of the battery pack can be used more efficiently.

[0020] The first liquid-cooling plate is integrated into the battery pack. Its larger area contributes to the stability of the first cell unit and the battery pack as a whole, and facilitates the installation of the first cell unit. Therefore, it is particularly suitable for being set at the bottom of the battery pack. The lower side does not contact the cell, and in addition to liquid cooling, it plays a supporting and load-bearing role. The bottom of the second liquid-cooling plate contacts the cell, and setting up multiple cells can better adapt to the unitized cell. The end plate is used to support the weight between layers and fix the cell into a cell unit, making this application more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all. Those skilled in the art can derive other drawings from these drawings without inventive effort.

[0022] Figure 1 A schematic diagram of an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of a liquid cooling plate in one embodiment of the present invention;

[0024] Reference numerals: first battery cell unit 1 , second battery cell unit 2 , first liquid cooling plate 3 , second liquid cooling plate 4 , end plate 5 , support frame 6 , insulating sheet 7 , liquid inlet three-way assembly 101 , connecting pipe 102 , liquid outlet three-way assembly 103 . DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0027] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0029] Please refer to Figure 1-2 The present application provides an embodiment of a liquid-cooled battery pack, comprising: a first battery cell unit 1, a second battery cell unit 2, a first liquid cooling plate 3 and a second liquid cooling plate 4; the first battery cell unit 1 and the second battery cell unit 2 both include an end plate 5 and a battery cell fixed to the inner side of the end plate 5; the two first battery cell units 1 are arranged on the first liquid cooling plate 3, and the first liquid cooling plate 3 is arranged as an integral whole; the two second liquid cooling plates 4 are arranged on the side of the first battery cell unit 1 away from the first liquid cooling plate 3, and the two second battery cell units 2 are respectively arranged on the second liquid cooling plates 4.

[0030] This embodiment has two layers of cell units, with two cell units per layer. Two split second liquid cooling plates 2 are provided between the first cell unit layer and the second cell unit layer. In other embodiments, each cell unit layer and each liquid cooling plate layer may have more than two. The present application utilizes cell units, which facilitates the rapid loading of bulk cells that have been reinforced as a whole into the battery pack, making the battery pack installation process more rational, reliable, safe, and efficient. It is particularly suitable for multi-layer batteries where a single-layer module consists of a large number of cells. When the cells are integrated into the unit, thermal management strategies can be implemented more effectively. The unitized arrangement of the liquid cooling plates and cells also helps ensure consistent cell temperature and extend battery life. By optimizing the design of the cell units, the space utilization of the battery pack can be improved, especially when a multi-layer module structure is used, which enables more efficient use of the internal space of the battery pack. It should be noted that the method of integrating cells into cell units is a prior art method, for example, stacking and connecting one or more cells in a certain pattern and then fixing them with a frame, end plates, thermal insulation adhesive, etc.

[0031] The first liquid cooling plate 3 is integrally provided. Its larger area contributes to the stability of the first battery cell unit 1 and the battery pack as a whole, and facilitates the installation of the first battery cell unit 1. Therefore, it is particularly suitable for being provided at the bottom of the battery pack. The lower side does not contact the battery cells, and in addition to liquid cooling, it plays a supporting and load-bearing role. The bottom of the second liquid cooling plate 4 contacts the battery cells, and providing multiple of them can better adapt to the unitized battery cells. The end plate 5 is used to support the weight between layers and fix the battery cells into battery cell units, making this application more stable.

[0032] like Figure 1 In this embodiment, the number of cells in the first battery cell unit 1 is greater than the number of cells in the second battery cell unit 2. Since the first battery cell unit 1 is suitable for being arranged near the bottom of the battery pack, setting the number of cells in a single first battery cell unit 1 to be greater than the number of cells in a single second battery cell unit 2 is conducive to rationally distributing the mass of the battery pack and improving the stability of the battery pack.

[0033] like Figure 1 In this embodiment, the size of the second liquid cooling plate 4 corresponds to that of a first battery cell unit 1, and the liquid inlet and outlet of the second liquid cooling plate 4 are located on the upper surface. When the number of cells in the first battery cell unit 1 is greater than the number of cells in the second battery cell unit 2, the volume of a single first battery cell unit 1 in the same arrangement is necessarily larger than that of the second battery cell unit 2. Setting the size of the second liquid cooling plate 4 to correspond to that of the first battery cell unit 1 facilitates leaving space above the second liquid cooling plate 4 for arranging the liquid inlet and outlet, as well as for connecting the respective liquid inlets and outlets. This can make the spatial layout more compact, reduce the volume of the battery pack, and make the shape more regular. In addition, arranging the connecting pipelines and the liquid inlet and outlet at the top facilitates the flow of the liquid cooling medium.

[0034] like Figure 2 In this embodiment, the second liquid cooling plate 4 includes a support frame 6 for supporting the second battery cell unit 2. The support frame 6 stabilizes the battery cell unit's position on the liquid cooling plate. Besides the number of cells, the first and second battery cell units 1 and 2 have essentially the same structure, and the first liquid cooling plate 3 also has a similar support structure.

[0035] Using connectors to connect the battery cell unit and the liquid cooling plate can further improve the position stability of the battery cell unit on the liquid cooling plate, such as Figure 2 In this embodiment, the support frame 6 and the end plate 5 are screwed together by riveting nuts riveted to the support frame 6, which is simple to construct and has good strength and stability.

[0036] like Figure 2In this embodiment, the first liquid cooling plate 3 and the second liquid cooling plate 4 are provided with an insulating sheet 7 for preventing the battery cells from short-circuiting. The insulating sheet 7 has a simple structure, is easy to implement, and has high reliability. In other embodiments, other solutions can also be used for electrical isolation and protection.

[0037] like Figure 1 In this embodiment, the cooling medium of the first and second liquid cooling plates 3 and 4 is connected in parallel, while the cooling medium between two second liquid cooling plates 4 on the same layer is connected in series. This connection allows the cooling medium to be simultaneously input to and output from the first and second liquid cooling plates 3 and 4, resulting in uniform flow, improved heat dissipation, and a simpler structure.

[0038] Specifically, the liquid inlet of the first liquid cooling plate 3 and the second liquid cooling plate 4 that precedes each layer in the direction of the liquid cooling medium are connected in parallel through the liquid inlet tee assembly 101, and the liquid outlet of the first liquid cooling plate 3 and the second liquid cooling plate 4 that follows each layer in the direction of the liquid cooling medium are respectively connected to the liquid cooling medium source through the liquid outlet tee assembly 103, and the liquid outlet of the second liquid cooling plate 4 that precedes each layer in the direction of the liquid cooling medium is connected to the liquid inlet of the second liquid cooling plate 4 that follows the direction of the liquid cooling medium through a connecting pipe 102.

[0039] In this embodiment, both the first and second liquid cooling plates 3 and 4 have a single flow channel. Compared to multi-channel designs, where the flow uniformity of the medium cannot be controlled, uneven flow can occur, and heat dissipation efficiency is affected, the single-channel liquid cooling plate in this embodiment offers strong medium uniformity, a simple structure, low pressure, high flow rate, and sufficient heat dissipation efficiency to meet operational requirements.

[0040] In this embodiment, the first liquid cooling plate 3 and the second liquid cooling plate 4 are made of aluminum, which has good heat dissipation performance, is easy to process, and is economical. In other embodiments, other materials with better heat dissipation performance may be used instead.

[0041] In this embodiment, there is a second liquid cooling plate 4 and a second battery cell unit 2. In other embodiments, the second liquid cooling plate 4 and the second battery cell unit 2 can be alternately arranged in multiple layers to achieve stacking. The multi-layer module design can further improve space utilization and increase battery cell capacity by vertically stacking battery cell units without significantly increasing installation difficulty, because each unit remains an independent and relatively small component.

[0042] The contents described above can be implemented individually or in combination in various ways, and these variations are all within the scope of protection of the present invention.

[0043] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0044] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific embodiments of the present invention are not limited to these descriptions. For those skilled in the art of the present invention, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the scope of protection of the present invention.

Claims

1. A liquid-cooled battery pack, characterized in that: include: A first battery cell unit (1), a second battery cell unit (2), a first liquid cooling plate (3) and a second liquid cooling plate (4); the first battery cell unit (1) and the second battery cell unit (2) both comprise an end plate (5) and a battery cell fixed to the inner side of the end plate (5); a plurality of first battery cell units (1) are arranged on the first liquid cooling plate (3), and the first liquid cooling plate (3) is arranged as an integral unit; a plurality of second liquid cooling plates (4) are arranged on a side of the first battery cell unit (1) away from the first liquid cooling plate (3), and the second battery cell unit (2) is arranged on the second liquid cooling plate (4); an insulating sheet (7) for preventing battery cell short circuit is provided on the first liquid cooling plate (3) and / or the second liquid cooling plate (4).

2. The liquid-cooled battery pack according to claim 1, characterized in that: The number of battery cells in the first battery cell unit (1) is greater than the number of battery cells in the second battery cell unit (2).

3. The liquid-cooled battery pack according to claim 2, characterized in that: The size of the second liquid cooling plate (4) corresponds to that of the first battery core unit (1), and the liquid inlet and the liquid outlet of the second liquid cooling plate (4) are arranged on the upper surface.

4. The liquid-cooled battery pack according to claim 1, characterized in that: The second liquid cooling plate (4) comprises a support frame (6) that can be used to support the second battery cell unit (2).

5. The liquid-cooled battery pack according to claim 4, characterized in that: The support frame (6) and the end plate (5) are screwed together via rivet nuts.

6. The liquid-cooled battery pack according to claim 1, characterized in that: The liquid cooling medium of the first liquid cooling plate (3) and the liquid cooling medium of the second liquid cooling plate (4) are connected in parallel, and the liquid cooling medium of a plurality of the second liquid cooling plates (4) on the same layer are connected in series.

7. The liquid-cooled battery pack according to claim 1, characterized in that: The first liquid cooling plate (3) and the second liquid cooling plate (4) are both single-channel.

8. The liquid-cooled battery pack according to claim 1, characterized in that: The material of the first liquid cooling plate (3) and / or the second liquid cooling plate (4) is aluminum.

9. The liquid-cooled battery pack according to any one of claims 1 to 8, characterized in that: It comprises alternately stacked layers of the second liquid cooling plates (4) and the second battery core units (2).

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