Liquid-cooled battery pack

Abstract

The utility model belongs to the technical field of single batteries, and particularly relates to a liquid-cooled battery pack. The liquid-cooled battery pack comprises a liquid-cooled box body, a liquid-cooled top plate, two sealing plates, a first sealing piece and a plurality of battery monomers, the liquid-cooled box body comprises a liquid-cooled bottom plate and end plates located at the two ends of the liquid-cooled bottom plate in the length direction respectively, and the two ends of the liquid-cooled top plate in the length direction are connected with the top ends of the end plates respectively; the multiple single batteries are arranged on the liquid cooling bottom plate and located between the two end plates, the two sealing plates are connected to the two sides of the liquid cooling box body in the length direction respectively, the top of each end plate is provided with an end plate first sealing groove, the end plate first sealing grooves are used for containing first sealing pieces, and the bottom face of the liquid cooling top plate makes contact with the first sealing pieces; cooling liquid circulates in the liquid cooling top plate and the liquid cooling bottom plate. By using the liquid-cooled battery pack in the technical scheme, water can be effectively prevented from entering the liquid-cooled box body, so that the safety risks such as internal short circuit of the battery monomers, fire breakout of the battery monomers, electric leakage and the like are avoided.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a liquid-cooled battery pack. Background Technology

[0002] Blade batteries are a type of prismatic battery cell. They are called blade batteries because of their slender, blade-like shape. Blade batteries have high volumetric and energy densities, good safety, and do not catch fire or explode in nail penetration tests. As a result, their installation volume has increased significantly in recent years.

[0003] Battery packs typically release a significant amount of heat during use or charging / discharging. If this heat cannot be dissipated in a timely manner, it will negatively impact the battery pack's lifespan and performance. Cooling via coolant is a common heat dissipation method for blade batteries. Liquid-cooled blade battery packs often employ a CTP (Cell to Pack) structure, where the battery is directly integrated into the pack, thereby improving the volume utilization of the enclosure and the overall energy density of the battery pack. However, existing liquid-cooled battery packs connect the upper and lower liquid cooling plates via a surrounding plate, resulting in poor sealing. Considering the complex working environment, water can easily enter at the connection surface between the upper and lower liquid cooling plates and the surrounding plate, leading to seal failure, internal short circuits within the battery, and consequently, safety risks such as battery fire and leakage.

[0004] Therefore, there is an urgent need to develop a liquid-cooled battery pack to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to at least solve the problem of poor sealing performance in liquid-cooled battery packs. This objective is achieved through the following technical solution:

[0006] The first aspect of this utility model discloses a liquid-cooled battery pack, comprising a liquid-cooled housing, a liquid-cooled top plate, two sealing plates, a first sealing element, and multiple battery cells. The liquid-cooled housing includes a liquid-cooled bottom plate and two end plates located at opposite ends of the liquid-cooled bottom plate along its length. The two ends of the liquid-cooled top plate along its length are respectively connected to the top of the corresponding end plates. The multiple battery cells are disposed on the liquid-cooled bottom plate and located between the two end plates. The two sealing plates are respectively connected to both sides of the liquid-cooled housing along its length. Each end plate has a first sealing groove at its top for placing the first sealing element. The bottom surface of the liquid-cooled top plate contacts the first sealing element. Coolant flows inside the liquid-cooled top plate and the liquid-cooled bottom plate.

[0007] The liquid-cooled battery pack in this technical solution significantly increases the heat dissipation area of ​​the battery cells by setting liquid-cooled top plates and liquid-cooled bottom plates at the top and bottom of the individual cells, effectively improving heat dissipation efficiency. The battery cells are encapsulated by the liquid-cooled housing, liquid-cooled top plates, and two sealing plates, forming a high-strength integrated structure. The first sealing groove on the end plate provides space for the installation of the first sealing element. By placing the first sealing element between the liquid-cooled top plate and the end plate, it effectively provides waterproofing and dustproofing, effectively preventing water ingress into the liquid-cooled housing, thereby avoiding internal short circuits in the battery cells and potential safety risks such as battery cell fires and leakage.

[0008] In addition, the liquid-cooled battery pack of this utility model may also have the following additional technical features:

[0009] In some embodiments of this utility model, the liquid-cooled battery pack further includes a second sealing element. The liquid-cooled bottom plate is provided with bottom plate sealing grooves on both sides along its length, the end plate is provided with end plate second sealing grooves on both sides along its length, and the liquid-cooled top plate is provided with top plate sealing grooves on both sides along its length. The bottom plate sealing grooves, the end plate second sealing grooves, and the top plate sealing grooves are used to place the second sealing element, and the sealing plate is in contact with the second sealing element.

[0010] In some embodiments of this utility model, the bottom plate sealing groove, the end plate second sealing groove, and the top plate sealing groove are connected to form an annular groove.

[0011] In some embodiments of this utility model, the first sealing groove of the end plate and the second sealing groove of the end plate are connected.

[0012] In some embodiments of this utility model, the first sealing element is potting compound or silicone gasket.

[0013] In some embodiments of this utility model, the liquid-cooled base plate is provided with a first liquid inlet and a first liquid outlet, and the first liquid inlet and the first liquid outlet are respectively connected to the interior of the liquid-cooled base plate.

[0014] In some embodiments of this utility model, the liquid-cooled top plate is provided with a second liquid inlet and a second liquid outlet, and the second liquid inlet and the second liquid outlet are respectively connected to the interior of the liquid-cooled top plate.

[0015] In some embodiments of this utility model, the liquid-cooled top plate is the top cover of the liquid-cooled battery pack.

[0016] In some embodiments of this utility model, a high-low voltage connector assembly is provided on the outer side of one of the end plates. The high-low voltage connector assembly includes a battery high-voltage connector and a low-voltage communication connector. The battery high-voltage connector and the low-voltage communication connector are used to electrically connect the battery cell and the external device, respectively.

[0017] In some embodiments of this utility model, each of the battery cells is provided with a terminal post at both ends, the two terminals are located on both sides of the length direction of the liquid cooling box, and a plurality of battery cells are arranged along the length direction of the liquid cooling box. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 A schematic diagram of the structure of a liquid-cooled battery pack according to an embodiment of the present invention is shown from a certain perspective.

[0020] Figure 2 An explosion of a liquid-cooled battery pack according to an embodiment of the present invention is illustrated schematically. Figure 1 ;

[0021] Figure 3 An explosion of a liquid-cooled battery pack according to an embodiment of the present invention is illustrated schematically. Figure 2 ;

[0022] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 A schematic diagram of the structure of a liquid-cooled battery pack according to an embodiment of the present invention is shown from another perspective.

[0024] The labels in the attached diagram are as follows:

[0025] 100. Liquid-cooled housing; 110. Liquid-cooled base plate; 111. Base plate sealing groove; 120. End plate; 121. End plate first sealing groove; 122. End plate second sealing groove; 130. First liquid inlet; 140. First liquid outlet;

[0026] 200, Liquid-cooled top plate; 210, Top plate sealing groove; 220, Second liquid inlet; 230, Second liquid outlet;

[0027] 300, sealing plate;

[0028] 400, First seal; 500, Battery cell; 510, Terminal post; 600, Second seal; 700, High and low voltage connector assembly; 710, Battery high voltage connector; 720, Low voltage communication connector; 800, Explosion-proof valve. Detailed Implementation

[0029] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0030] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0031] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0032] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0033] Figure 1 A schematic diagram of the structure of a liquid-cooled battery pack according to an embodiment of the present invention is shown from a certain perspective. Figure 2 An explosion of a liquid-cooled battery pack according to an embodiment of the present invention is illustrated schematically. Figure 1 . Figure 3 An explosion of a liquid-cooled battery pack according to an embodiment of the present invention is illustrated schematically. Figure 2 . Figure 4 yes Figure 3 A magnified view of point A in the middle. (See image below.) Figures 1 to 4 As shown, this utility model proposes a liquid-cooled battery pack, including a liquid-cooled housing 100, a liquid-cooled top plate 200, two sealing plates 300, a first sealing element 400, and multiple battery cells 500. The liquid-cooled housing 100 includes a liquid-cooled bottom plate 110 and two end plates 120 located at both ends of the liquid-cooled bottom plate 110 along its length. The two ends of the liquid-cooled top plate 200 along its length are respectively connected to the top of the corresponding end plates 120. Multiple battery cells 500 are disposed on the liquid-cooled bottom plate 110 and located between the two end plates 120. The two sealing plates 300 are respectively connected to both sides of the liquid-cooled housing 100 along its length. Each end plate 120 has a first sealing groove 121 at its top, which is used to place the first sealing element 400. The bottom surface of the liquid-cooled top plate 200 is in contact with the first sealing element 400. Coolant flows inside the liquid-cooled top plate 200 and the liquid-cooled bottom plate 110.

[0034] The liquid-cooled battery pack in this technical solution greatly increases the heat dissipation area of ​​the battery cell 500 by setting a liquid-cooled top plate 200 and a liquid-cooled bottom plate 110 at the top and bottom of the battery cell 500, respectively, thus effectively improving heat dissipation efficiency. The battery cell 500 is encapsulated by the liquid-cooled housing 100, the liquid-cooled top plate 200, and two sealing plates 300 to form a high-strength integrated structure. The first sealing groove 121 of the end plate provides space for the installation of the first sealing element 400. By setting the first sealing element 400 between the liquid-cooled top plate 200 and the end plate 120, it can effectively play a role in waterproofing and dustproofing, effectively preventing water from entering the liquid-cooled housing 100, thereby avoiding internal short circuits in the battery cell 500 and safety risks such as fire and leakage of the battery cell 500.

[0035] Optionally, the liquid-cooled top plate 200 and end plate 120, the sealing plate 300 and liquid-cooled housing 100, and the liquid-cooled top plate 200 of the sealing plate 300 can be fixedly connected by means of adhesive bonding, bolt connection, laser welding, etc., to ensure the sealing of the connection surfaces and make the battery pack structure a whole, thereby giving it sufficient strength and rigidity. Optionally, the end plate 120 and the liquid-cooled housing 100 can be a one-piece molded structure, thereby ensuring the overall structural stability of the battery pack.

[0036] Optionally, each end of the battery cell 500 is provided with a terminal post 510, and the two terminals 510 are located on both sides of the length direction of the liquid cooling box 100, and multiple battery cells 500 are arranged along the length direction of the liquid cooling box 100.

[0037] Optionally, the battery cell 500 is a blade battery cell. The number of battery cells 500 is designed according to the usage requirements; preferably, the number of battery cells 500 is less than 300.

[0038] Optionally, Figure 5 A schematic diagram of the liquid-cooled battery pack according to an embodiment of the present invention is shown from another perspective. See also Figure 4 and Figure 5 The first sealing groove 121 of the end plate is a strip-shaped groove formed on the top of the end plate 120. The length of the first sealing groove 121 of the end plate can be equal to or less than the width of the end plate 120.

[0039] Optionally, the first seal 400 is a potting compound or a silicone gasket.

[0040] The potting compound can be epoxy resin, silicone, or polyurethane. By injecting the potting compound into the first sealing groove 121 of the end plate, after curing, it effectively improves the sealing performance between the end plate 120 and the liquid-cooled top plate 200, and also serves to bond the end plate 120 and the liquid-cooled top plate 200. The silicone gasket has advantages such as insulation, pressure resistance, high temperature resistance, and environmental safety, while also providing a good seal.

[0041] Furthermore, the liquid-cooled battery pack also includes a second seal 600. The liquid-cooled bottom plate 110 has bottom plate sealing grooves 111 on both sides along its length, the end plate 120 has end plate second sealing grooves 122 on both sides along its length, and the liquid-cooled top plate 200 has top plate sealing grooves 210 on both sides along its length. The bottom plate sealing grooves 111, end plate second sealing grooves 122, and top plate sealing grooves 210 are used to place the second seal 600, and the sealing plate 300 contacts the second seal 600.

[0042] Optionally, the bottom plate sealing groove 111, the end plate second sealing groove 122, and the top plate sealing groove 210 are all strip-shaped. By pressing the second sealing element 600 into the sealing groove with the sealing plate 300, the position of the second sealing element 600 can be prevented from shifting, thereby ensuring good sealing performance.

[0043] Optionally, the second sealing groove 122 of the end plate can communicate with the first sealing groove 121 of the end plate, so that the top edge and both sides of the end plate 120 can be well sealed.

[0044] Optionally, the second seal 600 is a potting compound or a silicone gasket. The potting compound can be an epoxy resin potting compound, a silicone potting compound, or a polyurethane potting compound.

[0045] In one embodiment, the bottom plate sealing groove 111, the end plate second sealing groove 122, and the top plate sealing groove 210 are connected to form an annular groove.

[0046] When the bottom plate sealing groove 111, the end plate second sealing groove 122, and the top plate sealing groove 210 are connected, the second sealing element 600 can be a rectangular frame structure. Connecting the bottom plate sealing groove 111, the end plate second sealing groove 122, and the top plate sealing groove 210 can enhance sealing performance. Of course, in some embodiments, the bottom plate sealing groove 111, the end plate second sealing groove 122, and the top plate sealing groove 210 can be independent strip-shaped groove structures.

[0047] Furthermore, the liquid-cooled base plate 110 is provided with a first liquid inlet 130 and a first liquid outlet 140, which are respectively connected to the interior of the liquid-cooled base plate 110.

[0048] Understandably, the first inlet 130 is used to introduce coolant. After circulating inside the liquid-cooled base plate 110, the coolant flows out through the first outlet 140, thereby carrying away the heat from the liquid-cooled base plate 110 and achieving the effect of cooling the battery cell 500. Optionally, the first inlet 130 and the first outlet 140 are located at the same end of the liquid-cooled base plate 110 and are symmetrically arranged about the central axis of the liquid-cooled base plate 110. Optionally, an S-shaped liquid cooling channel can be provided inside the liquid-cooled base plate 110 to allow for sufficient heat exchange between the coolant and the liquid-cooled base plate 110.

[0049] Furthermore, the liquid-cooled top plate 200 is provided with a second liquid inlet 220 and a second liquid outlet 230, which are respectively connected to the interior of the liquid-cooled top plate 200.

[0050] Understandably, the second inlet 220 is used to introduce coolant. After circulating inside the liquid-cooled top plate 200, the coolant flows out through the second outlet 230, thereby carrying away the heat from the liquid-cooled top plate 200 and achieving the effect of cooling the battery cell 500. Optionally, the second inlet 220 and the second outlet 230 are located at the same end of the liquid-cooled top plate 200 and are symmetrically arranged about the liquid-cooled top plate 200. Optionally, an S-shaped liquid cooling channel can be provided inside the liquid-cooled top plate 200 to allow for sufficient heat exchange between the coolant and the liquid-cooled top plate 200. By allowing the coolant to circulate at the top and bottom of the battery cell 500 respectively, the heat dissipation rate of the battery cell 500 can be effectively improved, and the heat dissipation can be made more uniform. Optionally, the first inlet 130, the first outlet 140, the second inlet 220, and the second outlet 230 can be located at the same end of the battery pack, or they can be arranged at any position in the battery pack as needed.

[0051] Furthermore, the liquid-cooled top plate 200 serves as the top cover for the liquid-cooled battery pack.

[0052] Using a liquid-cooled top plate 200 as the top cover of the liquid-cooled battery pack has the advantages of being lightweight, simple in structure, strong in heat dissipation, high in structural strength, low in cost and easy to process compared to traditional plastic or metal top covers.

[0053] Furthermore, a high-low voltage connector assembly 700 is provided on the outer side of one of the end plates 120. The high-low voltage connector assembly 700 includes a battery high-voltage connector 710 and a low-voltage communication connector 720. The battery high-voltage connector 710 and the low-voltage communication connector 720 are used to electrically connect the battery cell 500 and the external device, respectively.

[0054] Optionally, in this embodiment, the high and low voltage connector assembly 700, the first liquid inlet 130, and the second liquid inlet 220 are located on the same side of the battery pack. The coolant enters the battery pack from the end of the high and low voltage connector assembly 700, which can reduce the temperature difference between the two ends of the battery pack.

[0055] Optionally, one of the end plates 120 is provided with an explosion-proof valve 800, which is used for pressure relief.

[0056] In the event of excessively high battery pack temperature and internal gas leakage, the explosion-proof valve 800 can automatically open to release the high-temperature, high-pressure gas, thereby preventing dangerous accidents such as explosions or fires. Optionally, the explosion-proof valve 800 can be mounted on the same end plate 120 as the high- and low-voltage connector assembly 700, or it can be mounted on a different end plate 120, depending on the specific application requirements.

[0057] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A liquid-cooled battery pack, characterized in that, The device includes a liquid-cooled housing (100), a liquid-cooled top plate (200), two sealing plates (300), a first sealing element (400), and multiple battery cells (500). The liquid-cooled housing (100) includes a liquid-cooled bottom plate (110) and two end plates (120) located at both ends of the liquid-cooled bottom plate (110) along its length. The two ends of the liquid-cooled top plate (200) along its length are respectively connected to the top ends of the corresponding end plates (120). The multiple battery cells (500) are disposed on the liquid-cooled bottom plate (110). The top of the liquid-cooled top plate (200) is located between the two end plates (120), and the two sealing plates (300) are respectively connected to the two sides of the liquid-cooled box (100) along the length direction. Each end plate (120) has a first sealing groove (121) on its top. The first sealing groove (121) is used to place the first sealing element (400). The bottom surface of the liquid-cooled top plate (200) is in contact with the first sealing element (400). Coolant flows inside the liquid-cooled top plate (200) and the liquid-cooled bottom plate (110).

2. The liquid-cooled battery pack according to claim 1, characterized in that, The liquid-cooled battery pack also includes a second sealing element (600). The liquid-cooled bottom plate (110) has bottom plate sealing grooves (111) on both sides along its length, the end plate (120) has end plate second sealing grooves (122) on both sides, and the liquid-cooled top plate (200) has top plate sealing grooves (210) on both sides along its length. The bottom plate sealing grooves (111), the end plate second sealing grooves (122), and the top plate sealing grooves (210) are used to place the second sealing element (600). The sealing plate (300) is in contact with the second sealing element (600).

3. The liquid-cooled battery pack according to claim 2, characterized in that, The bottom plate sealing groove (111), the end plate second sealing groove (122), and the top plate sealing groove (210) are connected to form an annular groove.

4. The liquid-cooled battery pack according to claim 2, characterized in that, The first sealing groove (121) of the end plate and the second sealing groove (122) of the end plate are connected.

5. The liquid-cooled battery pack according to any one of claims 1-4, characterized in that, The first seal (400) is a potting compound or a silicone gasket.

6. The liquid-cooled battery pack according to any one of claims 1-4, characterized in that, The liquid-cooled base plate (110) is provided with a first liquid inlet (130) and a first liquid outlet (140), and the first liquid inlet (130) and the first liquid outlet (140) are respectively connected to the interior of the liquid-cooled base plate (110).

7. The liquid-cooled battery pack according to any one of claims 1-4, characterized in that, The liquid-cooled top plate (200) is provided with a second liquid inlet (220) and a second liquid outlet (230), and the second liquid inlet (220) and the second liquid outlet (230) are respectively connected to the interior of the liquid-cooled top plate (200).

8. The liquid-cooled battery pack according to any one of claims 1-4, characterized in that, The liquid-cooled top plate (200) is the top cover of the liquid-cooled battery pack.

9. The liquid-cooled battery pack according to any one of claims 1-4, characterized in that, One of the end plates (120) has a high-low voltage connector assembly (700) on its outer side. The high-low voltage connector assembly (700) includes a battery high-voltage connector (710) and a low-voltage communication connector (720). The battery high-voltage connector (710) and the low-voltage communication connector (720) are used to electrically connect the battery cell (500) and an external device, respectively.

10. The liquid-cooled battery pack according to any one of claims 1-4, characterized in that, Each of the battery cells (500) has a terminal post (510) at both ends. The two terminals (510) are located on both sides of the length direction of the liquid cooling box (100). The multiple battery cells (500) are arranged along the length direction of the liquid cooling box (100).

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