Liquid cooling plate, battery pack and vehicle

Abstract

The utility model discloses a liquid cooling plate, a battery pack and a vehicle. The liquid cooling plate comprises a first side plate and a second side plate which are oppositely arranged, the first side plate and the second side plate are connected to form a liquid flow cavity, cooling liquid flows through the liquid flow cavity, and the first side plate and the second side plate are both of a cambered surface structure. The deformation of the battery cell drives the deformation of the cambered surface structure, so that the smoothness of the liquid flow cavity is ensured, the liquid cooling of the cooling liquid in the liquid flow cavity on the battery cell is realized, the thermal management performance of the battery cell is improved, and the cycle life of the battery cell is prolonged.

Description

Technical Field

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

[0002] Battery cells undergo a certain degree of volume change during charge and discharge. In particular, some materials in lithium-ion batteries experience significant expansion and contraction during charge and discharge. This volume change poses challenges to the battery's mechanical structure and thermal management system, particularly in the design of battery cells and liquid cooling plates.

[0003] Currently, some large-surface liquid cooling plates have flat sides, which achieve thermal management of the battery cells by bonding with the battery cells. However, during the expansion of the battery cells, due to the limiting effect of the battery cell shell itself, the expansion distance of the middle part of the battery cell is greater than the expansion distance of the surrounding areas. When the large surface of the battery cell is a flat structure, the middle position of the liquid cooling plate is more likely to reach the limit state, which affects the thermal management performance of the battery cell and increases the force on the battery cell, which is not conducive to the cycle life of the battery cell. Utility Model Content

[0004] The purpose of the present invention is to solve the above problems and provide a liquid cooling plate, a battery pack and a vehicle to improve the thermal management performance of the battery cells.

[0005] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0006] In a first aspect, a liquid cooling plate is applied to a battery pack, wherein the battery pack includes a battery cell and the liquid cooling plate, wherein the battery cell is sandwiched between any two of the liquid cooling plates, and wherein the liquid cooling plate includes a first side plate and a second side plate that are arranged opposite to each other, wherein the first side plate and the second side plate are connected to form a liquid flow cavity, wherein a coolant flows through the liquid flow cavity, and the first side plate and the second side plate both have an arc surface structure.

[0007] Furthermore, it also includes a plurality of compression ribs, which are arranged at intervals and connected between the first side plate and the second side plate, dividing the liquid flow cavity into a plurality of cooling liquid channels for the cooling liquid to flow.

[0008] Furthermore, it also includes a first limiting rib and a second limiting rib, the first limiting rib and the second limiting rib are relatively arranged in the coolant channel through which the coolant flows, and the first limiting rib and the second limiting rib are respectively fixed to the first side plate and the second side plate.

[0009] Furthermore, the compression rib is tilted from the first side plate toward the second side plate, the first limiting rib and the second limiting rib are staggered, and the inclination direction of the line connecting the center of the first limiting rib and the center of the second limiting rib is opposite to the inclination direction of the compression rib.

[0010] Furthermore, before the battery cell expands, the first limiting rib and the second limiting rib have a first offset distance H in the longitudinal direction, and the compression rib has a first projected length. After the battery cell expands, the compression rib has a second projected length, and the difference between the first projected length and the second projected length is equal to the first offset distance.

[0011] Furthermore, an included angle θ formed by the inclined extension direction of the compression rib and the second side plate is greater than or equal to 35 degrees and less than or equal to 45 degrees.

[0012] Furthermore, the first limiting rib and the second limiting rib are close to each other, so that the contact time between the first limiting rib and the second limiting rib arranged in different coolant channels is synchronized.

[0013] Furthermore, the first limiting ribs and the second limiting ribs are provided in multiple pairs, and the multiple pairs of the first limiting ribs and the second limiting ribs are provided one by one in the corresponding coolant channels;

[0014] And / or, each of the cooling liquid channels is provided with a plurality of pairs of the first limiting ribs and the second limiting ribs.

[0015] In a second aspect, a battery pack includes a plurality of battery cells and at least one liquid cooling plate as described in the first aspect, wherein a heat-conducting structural adhesive is provided between the battery cells and the liquid cooling plate.

[0016] In a third aspect, a vehicle comprises the battery pack as described in the second aspect.

[0017] Compared with the prior art, the beneficial effects of the present invention are mainly reflected in:

[0018] Both the first side plate and the second side plate are arc-surface structures. The deformation of the battery cell drives the deformation of the arc-surface structure. When the battery cell expands, the interaction force between the battery cell and the liquid cooling plate ensures that the liquid flow cavity is unobstructed, thereby improving the thermal management performance of the battery cell and increasing the cycle life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the external structure of the liquid cooling plate provided in an embodiment of the present application;

[0020] Figure 2 A schematic cross-sectional view of a liquid cooling plate provided in an embodiment of the present application;

[0021] Figure 3 This is a schematic structural diagram of a liquid cooling plate in one embodiment of the present application;

[0022] Figure 4 for Figure 3 Schematic diagram of the combined structure of two adjacent liquid cooling plates and battery cells;

[0023] Figure 5 A schematic diagram of the structure of the liquid cooling plate provided in an embodiment of the present application in a deformed state;

[0024] Figure 6 for Figure 2 A partial enlarged view of part A in the middle.

[0025] Reference numerals:

[0026] Liquid cooling plate 1, battery cell 2, first side plate 11, second side plate 12, liquid flow cavity 13, compression rib 20, first limiting rib 41, second limiting rib 42, first deformation surface 51, second deformation surface 52. DETAILED DESCRIPTION

[0027] In order to make the technical solutions and advantages of the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, and are not an exhaustive list of all the embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless they conflict.

[0028] The utility model proposes a liquid cooling plate 1, which is applied to a battery pack. Figures 3 and 4 The battery pack of the present invention includes multiple battery cells 2 and multiple liquid cooling plates 1, with a battery cell 2 sandwiched between any two liquid cooling plates 1. Furthermore, multiple liquid cooling plates 1 can be provided, staggered to ensure that both opposing sides of a battery cell 2 (or a column of batteries) are affixed with a liquid cooling plate 1. This improves the thermal management performance of the liquid cooling plates 1 for the battery cells 2, thereby significantly extending the service life of the battery cells 2.

[0029] like Figure 1-Figure 2As shown, this embodiment provides a liquid cooling plate, comprising a first side plate 11 and a second side plate 12 disposed opposite each other. The first and second side plates 11, 12 are connected to form a liquid flow cavity 13, through which coolant flows. Both the first and second side plates 11, 12 are designed with curved surface structures. The curved surface structures are convex and point toward the battery cells 2. Deformation of the battery cells 2 drives deformation of the curved surface structures, resulting in uniform deformation of the entire curved surface structure. This ensures unobstructed flow of the liquid flow cavity 13 during deformation, allowing the coolant in the liquid flow cavity 13 to cool the battery cells 2. Compared to side plates designed with a flat structure, the curved surface design distributes the tensile stress of each battery cell expansion on the liquid cooling plate from the ends to the middle, reducing stress fatigue at the ends of the liquid cooling plate. This fatigue stress can cause fatigue damage to the liquid cooling plate 1 material. Specifically, when the battery cells 2 expand, the middle portion of the liquid cooling plate 1 is stressed first, while the ends of the liquid cooling plate 1 are subjected to less stress, thereby reducing fatigue damage to the liquid cooling plate 1 material. Therefore, the liquid cooling plate 1 of the present invention has cooling and buffering functions, which can improve the space utilization of the battery pack, so that as many battery cells 10 as possible can be arranged in the battery pack, thereby improving the endurance, power performance, charging speed and safety.

[0030] Explanatory, as Figure 3 As shown, multiple liquid cooling plates 1 and multiple battery cells 2 are staggered, that is, a battery cell 2 is sandwiched between two adjacent liquid cooling plates 1, and a liquid cooling plate 1 is provided between two adjacent battery cells 2, thereby effectively ensuring the safety and service life of the battery cells 2; specifically, on the one hand, the liquid cooling plate 1 is located between two adjacent battery cells 2, and the coolant flowing in the liquid flow cavity 13 absorbs the heat generated by the battery cells 2 by utilizing its large heat capacity characteristics, delaying the increase in the temperature of the battery cells 2, and utilizing the liquid cooling plate 1 to block the heat transfer between the two adjacent battery cells 2, effectively isolating the transfer and diffusion of heat, and suppressing the occurrence of heat spread, thereby improving the safety of the battery cells 2.

[0031] In one example, the liquid cooling plate 1 is made of a material with good thermal conductivity, such as silver, copper, aluminum, etc.; the liquid cooling plate 1 covers multiple battery cells 2 at the same time, such as Figure 3 As shown, multiple battery cells 2 are arranged on both sides of the liquid cooling plate 1. When one of the battery cells 2 experiences thermal runaway, the heat is quickly dispersed by utilizing its material with good thermal conductivity. At the same time, the large heat capacity of its internal coolant is utilized to quickly absorb a large amount of heat, thereby reducing the heat transfer from the battery cell 2 experiencing thermal runaway to the surrounding battery cells 2 per unit time, so that the heat absorbed by a single battery cell 2 per unit time is far lower than its thermal runaway threshold, effectively preventing the occurrence of heat spread and ensuring the safety of the battery pack.

[0032] Preferably, the liquid cooling plate 1 is made of aluminum alloy and formed through an extrusion process to form a liquid flow cavity 13. The liquid cooling plate 1 is bonded to the surface of the battery cell 2. During the charge and discharge process of the battery cell 2, coolant flows into the liquid flow cavity 13 through the inlet and is discharged through the outlet, removing heat generated by the battery cell 2. Compared with conventional liquid cooling plate surface designs with flat surfaces, fatigue stress at both ends of the liquid cooling plate 1 is reduced by at least 30%, significantly reducing material fatigue damage. At the same time, the coolant flow rate and flow rate in the liquid flow cavity 13 remain stable, ensuring efficient heat dissipation from the battery cell 2 and improving the cycle life of the battery cell 2.

[0033] In one embodiment, if Figure 1 、 2 As shown, the system further includes a plurality of compression ribs 20, which are arranged at intervals and connected between the first side plate 11 and the second side plate 12. These ribs divide the liquid flow cavity 13 into a plurality of coolant channels for the flow of coolant. Coolant can be selectively added to these channels based on actual cooling needs. The coolant channels can adopt straight, U-shaped, or S-shaped paths to achieve uniform cooling. The coolant can be a mixture of water and ethylene glycol in a 1:1 volume ratio.

[0034] In the above embodiment, the liquid flow cavity 13 is separated by a plurality of compression ribs 20 arranged at intervals to form a plurality of liquid flow channels. The compression ribs 20 respectively support the first side plate 11 and the second side plate 12, so as to provide support for the liquid flow cavity 13, facilitate the flow of coolant in the liquid flow cavity 13, and improve the reliability and structural stability of the liquid cooling plate 1. In addition, through the arrangement of the compression ribs 20, a certain compression force is always maintained between the liquid cooling plate 1 and the battery cell 2. When the liquid cooling plate 1 is subjected to expansion and compression of the battery cell 2, a buffer and reverse supporting force can be provided to balance the expansion force of the liquid cooling plate 1, thereby ensuring the structural stability of the liquid cooling plate 1 while having a larger effective contact area with the battery cell 10. That is, during the life cycle of the battery cell 2, the compression ribs 20 are compressed and deformed, and the first side plate 11 and the second side plate 12 are deformed. The liquid cooling plate 1 can absorb and offset the expansion force of the battery cell 2 and adapt to the expansion deformation of the battery cell 2.

[0035] For example, Figure 5 As shown, the first deformation surface 52 formed by the expansion of the battery cell 2 matches the second deformation surface 51 formed by the deformation of the liquid cooling plate 1 to adapt to the expansion of the battery cell 2 during its life cycle, ensuring that the structure of the battery cell 2 is not damaged under appropriate pressure, thereby improving the cycle life of the battery cell 2 and the structural strength of the battery cell 2. At the same time, while ensuring the structural strength of the liquid cooling plate 1, a large effective contact area is always maintained between the liquid cooling plate 1 and the battery cell 2, thereby improving the cooling effect of the liquid cooling plate 1, thereby suppressing the occurrence of heat spread and improving the safety of the battery pack.

[0036] In some embodiments, the liquid cooling plate 1 including the cooling liquid channel is configured in an integrated harmonica tube style to reduce welding and assembly steps in the manufacturing process, thereby reducing manufacturing costs and process complexity, and improving production efficiency and product consistency.

[0037] In a preferred embodiment, two current collectors are provided at both ends of the liquid cooling plate 1 and are connected to a plurality of cooling liquid channels for distributing and collecting cooling liquid, thereby ensuring uniform and efficient flow of cooling liquid in the liquid cooling plate.

[0038] In one embodiment, the first and second limiting ribs 41, 42 are further provided. The first and second limiting ribs 41, 42 are positioned relative to each other in the coolant channel through which the coolant flows, and the first and second limiting ribs 41, 42 are respectively fixed to the first and second side panels 11, 12. In other words, the first limiting rib 41 and the first side panel 11, and the second limiting rib 42 and the second side panel 12 can be an integral structure, for example, fixedly connected by integral molding, welding, scarfing, or other connection methods, thereby improving the connection strength and making the structure more stable.

[0039] In one embodiment, if Figure 2 、 6 As shown, the compression ribs 20 are tilted from the first side plate 11 toward the second side plate 12, and the first limiting ribs 41 and the second limiting ribs 42 are staggered. The inclination direction of the line connecting the centers of the first limiting rib 41 and the second limiting rib 42 is opposite to the inclination direction of the compression ribs 20. When the battery cell 2 deforms and the curved surface structure deforms, the first limiting rib 41 and the second limiting rib 42 move closer to each other to limit the deformation of either the first side plate 11 or the second side plate 12 toward the other. This prevents the coolant channel from being blocked by excessive compression, ensures that the coolant channel, which is filled with coolant, remains unobstructed during the deformation process, and effectively cools the battery cell 2 with the coolant in the liquid flow cavity 13.

[0040] For example, under the expansion of the battery cell 10, the first limiting rib 41 and the second limiting rib 42 will approach each other. When the first limiting rib 41 and the second limiting rib 42 approach each other to abutment, the first side plate 11 and the second side plate 12 stop deforming. At this time, the distance between part of the first side plate 11 and the second side plate 12 is the sum of the transverse thicknesses of the first limiting rib 41 and the second limiting rib 42, which prevents the first side plate 11 and the second side plate 12 from being too close to each other and shrinking or even closing the cooling liquid channel, thereby ensuring smooth passage of the cooling liquid, thereby ensuring the cooling effect of the liquid cooling plate 1, and improving the thermal management performance of the liquid cooling plate 1 on the battery cell 2.

[0041] Furthermore, if Figure 6As shown, before the battery cell expands, the first limiting ribs 41 and the second limiting ribs 42 have a first offset distance H in the longitudinal direction, and the compression ribs 20 have a first projected length. After the battery cell 1 expands, the compression ribs 20 have a second projected length, and the difference between the first projected length and the second projected length is equal to the first offset distance H. This ensures that the first limiting ribs 41 and the second limiting ribs 42 have a larger effective contact area when they abut each other. For example, the opposing surfaces of the first limiting ribs 41 and the second limiting ribs 42 completely overlap, allowing the first limiting ribs 41 and the second limiting ribs 42 to more reliably support each other. This not only helps ensure the unobstructed flow of the coolant channel, but also helps ensure the structural stability of the liquid cooling plate 1. Specifically, the first limiting ribs 41 and the second limiting ribs 42 support each other with a larger effective contact area. Under the action of the expansion force of the battery cell 2, the liquid cooling plate 1 cooperates with the compression ribs 20 to make the structure more stable and improve the compressive strength of the plate body.

[0042] Preferably, the curved surface structure of the first side plate 11 and the second side plate 12 is combined to synchronize the contact time of the first limiting ribs and the second limiting ribs in different cooling liquid channels, which is more conducive to ensuring the structural stability of the liquid cooling plate 1.

[0043] In one embodiment, if Figure 6 As shown, the angle formed between the inclined extension direction of the compression rib 20 and the first side plate 11 is θ, which is greater than or equal to 35 degrees and less than or equal to 45 degrees. It can be understood that the size of the acute angle formed by the inclined extension direction of the compression rib 20 and the first side plate 11, and similarly the size of the acute angle formed by the inclined extension direction of the compression rib 20 and the second side plate 12, determines the size of the expansion force transmitted to the compression rib 20 via the first side plate 11 and the second side plate 12. Specifically, if the angle is too small, that is, less than 35 degrees, when the liquid cooling plate 1 is subjected to the expansion and compression of the battery cell 2, the compression rib 20 is easily compressed, and before the battery cell 2 expands, there is not enough initial pre-tightening force to maintain a certain compression force between the liquid cooling plate 1 and the battery cell 2, and it is impossible to provide a buffer and reverse supporting force for the liquid cooling plate 1 to balance the expansion force; if the angle is too large, that is, greater than 45 degrees, the structural strength of the liquid cooling plate 1 is too high. When the liquid cooling plate 1 is subjected to the expansion and compression of the battery cell 2, the compression rib 20 is difficult to be compressed, resulting in the battery cell 2 being subjected to excessive pressure and being restricted from expanding, which greatly increases the risk of the structure of the battery cell 2 being damaged and the life of the battery cell being attenuated too quickly. The specific value of θ can be 35 degrees, 40 degrees, or 45 degrees.

[0044] Reference Figure 6In one embodiment, the first limiting rib 41 and the second limiting rib 42 have a longitudinal height of h2, which is greater than or equal to 1 mm and less than or equal to 3 mm. The height can be set according to the size of h1. On the one hand, the structural stability of the liquid cooling plate 1 can be ensured. On the other hand, it can avoid that when the first limiting rib 41 and the second limiting rib 42 abut against each other, the space occupied by the cooling liquid channel is too large, resulting in too small a flow rate of the cooling liquid, or the cooling liquid channel is closed under the action of the expansion force of the battery cell 2, thereby affecting the cooling effect of the liquid cooling plate 1 and reducing the thermal management performance of the liquid cooling plate 1.

[0045] Specifically, if h2 is less than 1 mm, the contact surface between the first and second limiting ribs 41, 42 is too small. When the expansion force of the battery cell 2 is too large, the first and second limiting ribs 41, 42 are easily deformed, causing excessive deformation of the first and second side panels 11, 12, closing the coolant channel, thereby affecting the structural strength of the liquid cooling plate 1 and the smooth flow of the coolant. If h2 is greater than 3 mm, the contact surface between the first and second limiting ribs 41, 42 is too large, occupying a large space. In this case, there is less room for coolant flow in the coolant channel, which can easily reduce the flow of coolant and reduce the cooling effect of the liquid cooling plate 1. h2 can specifically be 1 mm, 2 mm, or 3 mm, etc.

[0046] Reference Figure 6 In one embodiment, the first side plate 11 and the second side plate 12 have a lateral width of h3, which is greater than or equal to 0.5 mm and less than or equal to 1 mm. This ensures that the first side plate 11 and the second side plate 12 are deformed under the expansion force of the battery cell 2, thereby balancing the expansion force of the battery cell 2 and meeting the cycle life requirements of the battery cell 2.

[0047] Specifically, if h3 is less than 0.5mm, the structural strength and anti-extrusion strength of the side panels are low, that is, they are easily deformed under the pressure of the internal coolant, as well as during processing and movement. Under the action of the expansion force of the battery cell 2, the first side panel 11 and the second side panel 12 are easily deformed. If h3 is greater than 1mm, the first side panel 11 and the second side panel 12 are too thick, resulting in excessive structural strength of the panel body. When the liquid cooling plate 1 is subjected to the expansion and compression of the battery cell 2, the first side panel 11 and the second side panel 12 are difficult to be squeezed and deformed, resulting in excessive pressure on the battery cell 2, which is restricted from expansion, and thus cannot meet the expansion force requirements of the battery cell 2, greatly increasing the risk of structural damage to the battery cell 2 and premature life reduction. h3 can specifically be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, etc.

[0048] Reference Figure 6In one embodiment, before the battery cell 2 expands, the width of the liquid flow cavity 13 in the transverse direction is h4, which is greater than or equal to 2 mm and less than or equal to 5 mm, to ensure that the coolant channel formed between the first side plate 11 and the second side plate 12 can meet the flow requirements. Specifically, h4 can be 2 mm, 3 mm, 4 mm, or 5 mm.

[0049] Reference Figure 6 In one embodiment, the lateral distance between the first limiting rib 41 and the second limiting rib 42 is h5, which is greater than or equal to 1 mm and less than or equal to 3 mm. This distance can be set based on the size of the compression rib 20, the value of θ, and the size of h4 to ensure that during the expansion and deformation of the battery cell 2, the first limiting rib 41 and the second limiting rib 42 can approach each other and abut with each other, with a large effective contact area. At the same time, the deformation of the first side plate 11 and the second side plate 12 is guaranteed, ensuring that the deformation of the first side plate 11 and the second side plate 12 can absorb and offset the expansion force of the battery cell 2, and limiting the deformation of the first side plate 11 and the second side plate 12 to the extreme position, so that the coolant can flow smoothly in the coolant channel between the first side plate 11 and the second side plate 12, meeting the refrigerant flow requirements. h5 can specifically be 1 mm, 2 mm, or 3 mm, etc.

[0050] In a preferred embodiment, the top of the liquid cooling plate 1 is 8-10 mm from the top of the battery cell 2, the bottom of the liquid cooling plate 1 is 6-8 mm from the bottom of the battery cell 2, and the coolant flow channels on both sides of the liquid cooling plate 1 are 3-5 mm from the corresponding sides of the battery cell. This design optimizes cooling efficiency, allowing the coolant to evenly cover the surface of the battery cell, reducing temperature gradients and ensuring that heat generated by the battery cell during operation is quickly removed to avoid local overheating.

[0051] Furthermore, a thermally conductive structural adhesive is provided between the battery cell 2 and the liquid cooling plate 1. Since the thermally conductive structural adhesive has excellent thermal conductivity and bonding properties, the connection structure between the battery cell 2 and the liquid cooling plate 1 can be simplified, the cost can be reduced, and the heat and expansion deformation generated by the battery cell 2 can be transferred to the liquid cooling plate 1, so that the liquid cooling plate 1 absorbs heat, slows down the heating rate of the battery cell 2, and absorbs and offsets the expansion force of the battery cell 2 and adapts to the expansion deformation of the battery cell 2.

[0052] In some embodiments, a liquid cooling plate is optimized, specifically designing a curved surface structure of the cooling plate 1. The curvature radius of the curved surface structure of the cooling plate 1 is optimized based on the expansion characteristics of the battery cells 2. Specifically, expansion data of the battery cells 2 under different charge and discharge states, including the amount, rate, and direction of expansion, is collected. The expansion characteristics of the battery cells 2 are experimentally measured and changes in the cell expansion state are recorded using equipment such as strain gauges and laser rangefinders. The collected expansion data is analyzed to determine the maximum expansion displacement and expansion area of the battery cells 2 under different charge and discharge states. A mathematical model of the cell 2 expansion is established to describe the cell 2 expansion under different states, and finite element analysis is performed to determine the distribution of cell 2 expansion. Based on the cell 2 expansion model, the curved surface structure and curvature radius of the cooling plate 1 are preliminarily determined. The curvature radius should be able to accommodate the maximum expansion displacement of the battery cells 2 while ensuring the overall strength of the cooling plate 1. The curvature radius of the cooling plate 1 is optimized using a genetic algorithm or particle swarm optimization method to minimize stress concentration and contact unevenness between the battery cells 2 and the cooling plate 1.

[0053] In a preferred embodiment, an optimized liquid cooling plate is constructed with an insulating layer applied to the curved surface of the cooling plate 1, which is bonded to the battery cells 2. The insulating layer is made of a material with excellent electrical insulation and heat resistance, such as polyimide film, polytetrafluoroethylene, or ceramic coating. The thickness of the insulating layer is determined to be between tens and hundreds of microns, depending on the operating voltage of the battery cells 2 and the electrical insulation requirements of the cooling plate 1 material. The insulating layer is evenly applied to the curved surface of the cooling plate 1 using a spraying, dip coating, or lamination process, ensuring a smooth surface free of bubbles and defects to prevent current from penetrating the cooling plate 1 and causing internal short circuits in the battery pack.

[0054] This utility model also provides a battery pack comprising a plurality of battery cells 2 and a liquid cooling plate 1. The specific structure of the liquid cooling plate 1 is similar to that of the aforementioned embodiments. Since this battery pack utilizes all of the technical solutions of all of the aforementioned embodiments, it possesses at least all of the beneficial effects of the technical solutions of the aforementioned embodiments, and therefore will not be further detailed here. Multiple liquid cooling plates 1 are provided, and a battery cell 2 is sandwiched between any two liquid cooling plates 2.

[0055] The present utility model also proposes a car, which includes a battery pack. The specific structure of the battery pack refers to the above-mentioned embodiment. Since the present car adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0056] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0057] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A liquid cooling plate, applied to a battery pack, wherein the battery pack comprises a battery cell and the liquid cooling plate, wherein the battery cell is sandwiched between any two of the liquid cooling plates, and wherein: It includes a first side plate and a second side plate that are arranged opposite to each other. The first side plate and the second side plate are connected to form a liquid flow cavity. Cooling liquid flows through the liquid flow cavity. The first side plate and the second side plate both have curved surface structures.

2. The liquid cooling plate according to claim 1, characterized in that: It also includes a plurality of compression ribs, which are arranged at intervals and connected between the first side plate and the second side plate, dividing the liquid flow cavity into a plurality of cooling liquid channels for the cooling liquid to flow.

3. The liquid cooling plate according to claim 2, characterized in that: It also includes a first limiting rib and a second limiting rib, which are relatively arranged in a coolant channel through which coolant flows, and the first limiting rib and the second limiting rib are respectively fixed to the first side plate and the second side plate.

4. The liquid cooling plate according to claim 3, characterized in that: The compression rib is tilted from the first side plate toward the second side plate, the first limiting rib and the second limiting rib are staggered, and the inclination direction of the line connecting the center of the first limiting rib and the center of the second limiting rib is opposite to the inclination direction of the compression rib.

5. The liquid cooling plate according to claim 3, characterized in that: Before the battery cell expands, the first limiting rib and the second limiting rib have a first offset distance H in the longitudinal direction, and the compression rib has a first projected length. After the battery cell expands, the compression rib has a second projected length, and the difference between the first projected length and the second projected length is equal to the first offset distance.

6. The liquid cooling plate according to claim 4, characterized in that: An included angle θ formed by the inclined extension direction of the compression rib and the second side plate is greater than or equal to 35 degrees and less than or equal to 45 degrees.

7. The liquid cooling plate according to claim 4, characterized in that: The first limiting rib and the second limiting rib are close to each other, so that the contact time between the first limiting rib and the second limiting rib arranged in different coolant channels is synchronized.

8. The liquid cooling plate according to claim 3, characterized in that: There are multiple pairs of the first limiting ribs and the second limiting ribs, and the multiple pairs of the first limiting ribs and the second limiting ribs are arranged one by one in the corresponding coolant channels; And / or, each of the cooling liquid channels is provided with a plurality of pairs of the first limiting ribs and the second limiting ribs.

9. A battery pack, characterized in that: The invention comprises a plurality of battery cells and at least one liquid cooling plate according to any one of claims 1 to 8, wherein a heat-conducting structural adhesive is provided between the battery cells and the liquid cooling plate.

10. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 9.

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