Battery pack and electric device

Abstract

Embodiments of the present application disclose a battery pack and an electric device, and belong to the technical field of batteries. In the battery pack, a first plate body of a liquid cooling plate includes a plurality of first heat-conducting parts and a plurality of first elastic parts, and the first heat-conducting parts are in contact with the battery to cool the battery. The first heat-conducting parts are arranged between adjacent first elastic parts, so that when the battery is deformed by swelling and presses the first heat-conducting parts, the pressing force can be transmitted to the first elastic parts on both sides of the first heat-conducting parts. Meanwhile, a separation part is arranged between the first plate body and a second plate body, the separation part is connected with the first elastic parts to support the first elastic parts, so that the first elastic parts can be elastically deformed under the action of the pressing force to absorb the pressing force, thereby reducing the reaction force of the first heat-conducting parts on the swollen battery, avoiding pressing the battery, and prolonging the service life of the battery.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and specifically relates to a battery pack and an electrical device. Background Technology

[0002] Currently, the application of power batteries is becoming increasingly widespread in the market. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also constantly increasing. During battery use, heat is generated; if this heat is too high, it will adversely affect the battery's performance and lifespan. Therefore, how to effectively dissipate heat from batteries has become an important research direction in this field.

[0003] Traditional battery packs use bottom cooling, which leads to uneven battery temperature and uneven battery expansion, affecting battery life. The increased charging rate also generates significant heat. Therefore, battery manufacturers are actively seeking large-area liquid cooling solutions, with cooling a large area of ​​the battery being a good option. However, batteries can expand, and this expansion can cause compression, severely impacting battery life. Summary of the Invention

[0004] Purpose of the invention: This application provides a battery pack and an electrical device, aiming to solve the technical problem that the liquid cooling solution in the prior art will compress the expanding battery, resulting in a reduction in battery life.

[0005] Technical solution: A battery pack according to an embodiment of this application includes a battery and a liquid cooling plate;

[0006] The liquid cooling plate includes a first plate and a second plate disposed opposite to each other in a first direction, and a plurality of partitions disposed at intervals in a second direction. The first direction intersects the second direction, and the first plate is in contact with the battery.

[0007] The first plate includes a plurality of first heat-conducting portions and a plurality of first elastic portions spaced apart in the second direction. The first heat-conducting portions are connected between two adjacent first elastic portions, and the first heat-conducting portions are in contact with the battery.

[0008] The partition is disposed between the first plate and the second plate, with one end of the partition connected to the first elastic part and the other end of the partition connected to the second plate.

[0009] Accordingly, the electrical device described in this application includes the aforementioned battery pack.

[0010] Beneficial effects: Compared with the prior art, in the battery pack of this application embodiment, the first plate of the liquid cooling plate is in contact with the battery. The first plate includes multiple first heat-conducting parts and multiple first elastic parts, and the first heat-conducting parts contact the battery to achieve battery cooling. Furthermore, the first heat-conducting parts are disposed between adjacent first elastic parts, so that when the battery expands and deforms to squeeze the first heat-conducting parts, the squeezing force can be transmitted to the first elastic parts on both sides of the first heat-conducting parts. At the same time, a partition is provided between the first plate and the second plate, and the partition is connected to the first elastic parts to support the first elastic parts. Thus, the first elastic parts can generate elastic deformation under the action of squeezing force to absorb the squeezing force, thereby reducing the reaction force of the first heat-conducting parts on the expanding battery, avoiding squeezing the battery, and improving the battery life. On the other hand, since the first elastic parts can generate elastic deformation by absorbing the squeezing force, the shape of the first plate can be changed accordingly, so that the first plate can adapt to the expansion of the battery, thereby ensuring that the first heat-conducting parts and the battery always have sufficient contact area, which is beneficial to improving the cooling efficiency.

[0011] Compared with the prior art, the power device in the embodiments of this application includes the battery pack described above. It is understood that the power device can have all the technical features and beneficial effects of the battery pack described above, which will not be repeated here. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A three-dimensional structural diagram of the liquid cooling plate in the battery pack provided in an embodiment of this application;

[0014] Figure 2 This is a schematic diagram of the main structure of the liquid cooling plate in the battery pack provided in an embodiment of this application;

[0015] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of the liquid cooling plate along line AA;

[0016] Figure 4 for Figure 3 A magnified schematic diagram of a portion of region B in the middle;

[0017] Figure 5 for Figure 3 Another enlarged schematic diagram of the structure in region B;

[0018] Figure 6 for Figure 2 A schematic diagram of the three-dimensional structure of the liquid cooling plate after being cut along line AA;

[0019] Figure 7 for Figure 4 A magnified schematic diagram of a portion of region C in the middle;

[0020] Figure 8 A partial exploded structural diagram of the liquid cooling plate component in the battery pack provided in an embodiment of this application;

[0021] Figure 9 A partial cross-sectional view of the liquid cooling plate in a battery pack provided in another embodiment of this application;

[0022] Figure 10 This is a partial cross-sectional view of the liquid cooling plate in the battery pack provided in the third embodiment of this application;

[0023] Figure 11 This is a partial cross-sectional view of the liquid cooling plate in the battery pack provided in the fourth embodiment of this application;

[0024] Reference numerals: 100-Liquid cooling plate; 110-First plate; 111-First heat-conducting part; 112-First elastic part; 113-First rounded corner transition section; 114-Second rounded corner transition section; 120-Second plate; 121-Second heat-conducting part; 122-Second elastic part; 130-Accommodation space; 131-Flow channel; 140-Separation part; 200-Beam; 300-Manifold; 310-Liquid inlet pipe; 320-Liquid outlet pipe. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.

[0027] It should also be noted that, in the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular. For example, the range of included angles between 80° and 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel. For example, the range of completely parallel angles between 10° and 10° is considered parallel.

[0028] The applicant found that cooling the large surface area of ​​the battery is undoubtedly a good option in large-area liquid cooling solutions, but the battery expands, and how to solve the expansion caused by cooling the large surface area of ​​the battery is a problem. In addition, if the cooling system fails and the battery experiences thermal runaway, the liquid cooling plate cooling the large surface area of ​​the battery will become a good heat conductor, thus becoming an important cause of the spread of thermal runaway.

[0029] In view of the above, embodiments of this application provide a battery pack to solve at least one of the above-mentioned technical problems.

[0030] It should also be noted that a battery pack typically includes batteries and a liquid cooling plate. Batteries provide electrical energy, and multiple batteries can be connected in series and parallel as needed. The liquid cooling plate absorbs the heat generated during battery charging and discharging to cool the batteries and control the operating temperature of the battery pack within a reasonable range, ensuring the battery pack's proper functioning. To address the aforementioned technical problems, this application primarily improves the liquid cooling plate in the battery pack. Accordingly, the accompanying drawings mainly illustrate the structure of the liquid cooling plate. Optionally, the liquid cooling plate in this application is not limited to a straight plate; it can also be a W-shaped tube or a stepped tube, or other liquid cooling structures with different cross-sectional shapes.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, Figure 1The illustration shows the three-dimensional structure of the liquid cooling plate in the battery pack provided in the embodiment of this application. Figure 2 It indicated Figure 2 The front view structure of the liquid cooling plate in the battery pack provided in the embodiments of this application is as follows: Figure 3 It indicated Figure 2 Cross-sectional view of the liquid cooling plate along line AA.

[0032] As can be seen, the liquid cooling plate 100 of the battery pack includes a first plate 110 and a second plate 120 disposed opposite to each other in a first direction X. The first plate 110 and the second plate 120 are spaced apart to form a receiving space 130 for accommodating the cooling medium. That is, there is a gap between the oppositely disposed first plate 110 and second plate 120 of the liquid cooling plate 100, and the receiving space 130 formed by the gap is used to accommodate the cooling medium so as to achieve heat exchange with the battery through the cooling medium, thereby achieving the thermal management objective. Here, the first direction X is defined to clearly describe the arrangement relationship between the first plate 110 and the second plate 120. In actual products, depending on the installation and use of the battery pack, the first direction X may be any direction in space, and is not limited to a specific location.

[0033] The liquid cooling plate 100 also includes a plurality of partitions 140 spaced apart in the second direction Y, where the first direction X and the second direction Y intersect. The second direction Y is defined to clearly describe the arrangement of the partitions 140 in the first plate 110. The second direction Y and the first direction X can be in a relative lateral and longitudinal relationship, or they can intersect at other angles. In specific products, depending on the installation and usage of the battery pack, the second direction Y may be any direction in space, and is not limited to a specific orientation. Preferably, the first direction X and the second direction Y are perpendicular to each other.

[0034] The liquid cooling plate 100 contacts the battery through its first plate 110, cooling the battery through heat exchange to achieve thermal management of the battery pack. Depending on actual needs, the liquid cooling plate 100 can cool the battery solely through its first plate 110, or both its first plate 110 and second plate 120 can be used for battery cooling. That is, in the first direction X, a battery can be placed on one side of the liquid cooling plate 100, contacting the first plate 110 on that side, or batteries can be placed on both sides of the liquid cooling plate 100, contacting the first plate 110 and the second plate 120 respectively, for heat exchange.

[0035] Therefore, in the liquid cooling plate 100 of this application embodiment, at least the first plate body 110 is in contact with the battery. The first plate body 110 includes a plurality of first heat-conducting parts 111 and a plurality of first elastic parts 112. The plurality of first heat-conducting parts 111 are spaced apart along the second direction Y, and the plurality of first elastic parts 112 are spaced apart along the second direction Y. The first heat-conducting parts 111 are connected between two first elastic parts 112. In other words, along the second direction Y, the first heat-conducting part 111 and the first elastic part 112 are alternately arranged. By providing the first elastic part 112 capable of elastic deformation on both sides of the first heat-conducting part 111, when the first heat-conducting part 111 is subjected to a compressive force along the first direction X, the compressive force can be transmitted to the first elastic parts 112 on both sides. At the same time, the partition part 140 is connected between the first plate 110 and the second plate 120 to divide the accommodating space 130 into multiple flow channels 131. Furthermore, in the first direction X, one end of the partition part 140 is connected to the first elastic part 112, and the other end is connected to the second plate 120. Thus, the partition part 140 can support the first elastic part 112. Therefore, when the first elastic part 112 receives the compressive force, it can simultaneously receive a supporting force on the other side, thereby generating elastic deformation to offset the pressure on the first heat-conducting part 111, absorb the expansion of the battery, and avoid compressing the battery.

[0036] It is understood that in this battery pack, since the first plate 110 of the liquid cooling plate 100 includes a plurality of first heat-conducting parts 111 and a plurality of first elastic parts 112, the first heat-conducting parts 111 can contact the battery to cool it; and the first heat-conducting parts 111 are disposed between adjacent first elastic parts 112, so that when the battery expands and deforms to compress the first heat-conducting parts 111, the compressive force can be transmitted to the first elastic parts 112 on both sides of the first heat-conducting parts 111. At the same time, a partition 140 is provided between the first plate 110 and the second plate 120, and the partition 140 is connected to the first... The elastic part 112 is connected to support the first elastic part 112, so that the first elastic part 112 can undergo elastic deformation under the action of extrusion force to absorb the extrusion force, thereby reducing the reaction force of the first heat-conducting part 111 on the expanding battery, avoiding the battery being squeezed and improving the battery life; on the other hand, since the first elastic part 112 can undergo elastic deformation by absorbing the extrusion force, the shape of the first plate 110 can be changed accordingly, so that the first plate 110 can adapt to the expansion of the battery, thereby ensuring that the first heat-conducting part 111 and the battery always have sufficient contact area, which is beneficial to improving the cooling efficiency.

[0037] In some embodiments, when the battery is disposed only on one side of the liquid cooling plate 100, only the first plate 110 of the liquid cooling plate 100 can be configured as described above. Since the second plate 120 does not need to contact the battery and does not need to adapt to the force of battery expansion, it can be configured as a conventional structure, thereby reducing the manufacturing cost.

[0038] In some embodiments, when batteries are disposed on both sides of the liquid cooling plate 100, only the first plate 110 can be configured with the above-described structure to absorb the pressure of battery expansion to a certain extent and increase the contact area. Alternatively, both the first plate 110 and the second plate 120 can be configured with the above-described structure. That is, the second plate 120 includes a plurality of second heat-conducting parts 121 and a plurality of second elastic parts 122. The second heat-conducting parts 121 can contact the battery to cool it. Furthermore, the second heat-conducting parts 121 are disposed between adjacent second elastic parts 122, so that when the battery expands and deforms, squeezing the second heat-conducting parts 121, the squeezing force can be transmitted to the second elastic parts 122 on both sides of the second heat-conducting parts 121. At the same time, the other end of the separator 140 is connected to the second elastic parts 122 to support the second elastic parts 122. Thus, when the batteries on both sides expand, both the first plate 110 and the second plate 120 can reduce the pressure on the battery, adapt to the battery expansion, increase the contact area, and improve the cooling effect.

[0039] Please refer to the following: Figure 4 , Figure 5 , Figure 6 , Figure 4 It indicated Figure 3 The magnified structure of region B in the middle Figure 5 It indicated Figure 3 Another locally magnified structure in region B, Figure 6 It indicated Figure 2The three-dimensional structure of the liquid cooling plate after being cut along line AA; in some embodiments, the first elastic part 112 protrudes away from the battery relative to the first heat-conducting part 111. That is, with the first heat-conducting part 111 and the battery as references, the first elastic part 112 protrudes away from the battery relative to the first heat-conducting part 111, or the first elastic part 112 protrudes towards the side where the accommodating space 130 is located relative to the first heat-conducting part 111, or the first elastic part 112 protrudes towards the side where the second plate 120 is located relative to the first heat-conducting part 111. The battery referred to here is the battery that is in contact with the first plate 110. Since the first elastic part 112 protrudes towards the interior of the liquid cooling plate 100 relative to the first heat-conducting part 111, when observing the surface of the first plate 110 facing the battery, it can be seen that the first elastic part 112 is recessed. Thus, the entire first plate 110 is actually in contact with the battery through the first heat-conducting part 111. On the one hand, the first heat-conducting part 111 is in direct contact with the battery, and can directly remove the heat of the battery through the first heat-conducting part 111, ensuring heat exchange efficiency. On the other hand, when the battery expands, it can first compress the first heat-conducting part 111, making the two fit more tightly, and then transfer the pressure to the first elastic part 112, causing the first elastic part 112 to deform and absorb the pressure. This allows the first elastic part 112 to adaptively shrink, and the first heat-conducting part 111 to always remain in contact with the battery, continuously ensuring the heat exchange effect.

[0040] Please refer to the following: Figure 4 , Figure 5 , Figure 7 and Figure 8 , Figure 7 It indicated Figure 6 The magnified structure of the middle C region Figure 8 The illustration shows a partial structure of an explosion of a component of the liquid cooling plate in a battery pack provided in this application embodiment; it can be seen that the cross-section of the first elastic part 112 can be arc-shaped (e.g., Figure 4 (as shown) or a broken line shape (such as...) Figure 5 As shown in the figure, the arc shape can be a circular arc, and the polygonal shape can be a polygon. The cross section lies in the plane jointly defined by the first direction X and the second direction Y. It should be noted that the shape of the cross section can be approximately the shape described above, but is not limited to being exactly the same geometric shape. Setting the cross section of the first elastic part 112 into the above shape is beneficial to improving the elasticity of the first elastic part 112, that is, increasing the elastic deformation capability of the first elastic part 112, thereby improving the adaptability of the first plate 110 to the battery expansion deformation, ensuring the reduction effect of the extrusion pressure, and also ensuring that after the battery expands and deforms, the first heat-conducting part 111 has sufficient contact area with the battery to ensure the cooling effect.

[0041] Specifically, the cross-section of the first elastic part 112 is set into the shape described above. When the first heat-conducting part 111 is squeezed by the battery, the squeezing force along the first direction X will be transmitted to the first elastic part 112, which will be pulled open like a bow, and a certain elastic deformation can be generated to adaptively shrink, thereby enabling the first heat-conducting part 111 to adapt to the deformation of the battery, ensuring the contact area and ensuring the cooling efficiency.

[0042] Furthermore, since the first elastic part 112 has the aforementioned structure that protrudes away from the battery, when the first plate 110 is compressed by the battery expansion, the compressive force on the first heat-conducting part 111 is transmitted to the first elastic part 112. The first elastic part 112 is also simultaneously supported by the partition part 140, thereby generating elastic deformation. This elastic deformation includes not only deformation in the first direction X, but also deformation in the second direction Y. As a result, the first plate 110 moves closer to the second plate 120 while extending in the second direction Y. This causes the flow channel 131 between the first plate 110 and the second plate 120 to narrow in the first direction X and widen in the second direction Y, effectively maintaining the flow cross-sectional area and avoiding increased flow resistance due to the reduction of the flow cross-sectional area. This ensures cooling efficiency after battery expansion, especially at the end of the battery's life.

[0043] Please refer to it again. Figure 4The maximum protrusion of the first elastic part 112 relative to the first heat-conducting part 111 toward the receiving space 130 is d mm, and the maximum dimension of the liquid cooling plate 100 in the first direction X is D mm, and 0.05≤d / D≤0.95. That is, the range of d / D is 0.05 to 0.95, for example, it can be any value or a range between any two values ​​from 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95. A smaller ratio indicates a smaller elastic deformation capacity of the first plate 110, while a larger ratio indicates a stronger elastic deformation capacity. Controlling d / D within this range ensures the elastic deformation performance of the first elastic part 112, enhances its adaptability to battery expansion, maintains the fit between the first heat-conducting part 111 and the battery, and continuously guarantees the heat exchange effect. Specifically, the measurement method can involve using calipers or micrometers to measure the maximum distance between the outer walls of the relatively positioned first plate 110 and second plate 120, which is the maximum dimension Dmm of the liquid cooling plate 100 in the first direction X, i.e., the thickness of the liquid cooling plate 100. Alternatively, calipers or micrometers can be used to measure the maximum depth of the first elastic part 112 protruding away from the battery relative to the first heat-conducting part 111, i.e., the maximum relative drop between the same-side surfaces of the first elastic part 112 and the first heat-conducting part 111, to obtain this maximum dimension dmm.

[0044] In some embodiments, the elastic modulus of the first elastic part 112 is e GPa, the thickness of the first thermally conductive part 111 is L mm, and 10 ≤ e / L ≤ 685. That is, the range of e / L is 10 to 685, for example, it can be any value or a range between any two values ​​from 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, to 685. Controlling e / L within this range ensures the compatibility between the elastic deformation performance of the first elastic part 112 and the thermal conductivity performance of the first thermally conductive part 111, maintaining the heat exchange effect of the first thermally conductive part 111 on the battery. The elastic modulus can be measured using methods known in the art for measuring the elastic modulus of materials, and the thickness of the first thermally conductive part 111 can be measured using measuring tools such as vernier calipers or micrometers.

[0045] Specifically, the elastic modulus e of the first elastic part 112 is 20-137 GPa. For example, e can be any value from 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 137 or a range between any two values. The method for measuring the elastic modulus e can be selected from conventional static or dynamic methods.

[0046] The thickness L of the first heat-conducting part 111 is 0.2-2 mm. For example, L can be any value among 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.2, 1.4, 1.6, 1.8, and 2.0, or a range between any two values.

[0047] In some embodiments, for the entire first plate 110, the total area of ​​the first heat-conducting portion 111 on its surface facing the battery is S1 mm. 2 The total area of ​​the first elastic part 112 is S2 mm. 2And 0.1 ≤ S2 / S1 ≤ 5, this battery is the one in contact with the first plate 110. That is, the ratio of the total area S2 of the first elastic part 112 to the total area S1 of the first heat-conducting part 111 can be arbitrarily selected within the range of 0.1 to 5. For example, it can be any value from 0.1, 0.5, 0.8, 1, 1.5, 1.7, 2, 2.3, 2.6, 3, 3.5, 4, 4.2, 4.5, 4.6, 5, or any value between any two values. The smaller the ratio, the smaller the elastic deformation capacity of the first plate 110 and the stronger the heat conduction capacity. The larger the ratio, the stronger the elastic deformation capacity of the first plate 110 and the weaker the heat conduction capacity. To ensure the connection between the first heat-conducting part 111 and the first elastic part 112, this ratio cannot be less than 0.1. When the ratio is less than 0.1, the area of ​​the first elastic part 112 relative to the first heat-conducting part 111 is too small. In other words, the size of the first elastic part 112 needs to be made very small. On the one hand, this makes it difficult to process and ensure a stable connection with the first heat-conducting part 111. On the other hand, the elastic deformation capacity of the first plate 110 is too small to adapt to the expansion and deformation of the battery. At the same time, to obtain better thermal conductivity, this ratio cannot be greater than 5. When the ratio is greater than 5, the relative area of ​​the first heat-conducting part 111 is too small, and the contact area between the first plate 110 and the battery is too small, affecting the thermal conductivity. Of course, to achieve a balance between elastic deformation capacity and thermal conductivity, within this ratio range, it can be further preferred that 0.8 ≤ S2 / S1 ≤ 3.5, so that the entire first plate 110 has a better elastic deformation capacity, can adapt to the expansion of the battery, and ensure sufficient thermal conductivity. Specifically, the area of ​​all first heat-conducting parts 111 and the area of ​​all first elastic parts 112 in the exposed surface portion of the first plate 110 are measured using a measuring tool, and the total area of ​​the first heat-conducting parts 111 is obtained as S1 mm. 2 The total area of ​​the first elastic part 112 is S2mm. 2 Specifically, the total area of ​​the first heat-conducting part 111 is S1 mm. 2 The total area of ​​the first elastic part 112 is S2 mm. 2 This refers to the area of ​​the first plate 110 when it is not deformed by the battery. The area of ​​each first heat-conducting part 111 and the area of ​​each first elastic part 112 can be measured separately in different regions. The measurement can be performed using conventional methods for measuring the surface area of ​​an object. For example, a uniformly sized film can be attached to the surface to be measured, the film attached to the surface to be measured can be removed, and the mass of the film can be determined. The quotient of the mass of the removed film and the mass of the pre-determined unit area of ​​the film can be used to determine the area of ​​the surface to be measured.

[0048] In some embodiments, the material of the first elastic part 112 is a heat-insulating material, that is, the first elastic part 112 is made of a heat-insulating material, so the first elastic part 112 has heat insulation capability and can isolate part of the heat transfer when the liquid cooling plate fails and the battery experiences thermal runaway, effectively preventing the spread of thermal runaway.

[0049] Specifically, the thermal conductivity of the insulation material is λ≤0.35W / m·K, meaning that the thermal conductivity of the first elastic part 112 is λ≤0.35W / m·K. Using a material with a thermal conductivity value below this level can effectively prevent the spread of thermal runaway. The method for measuring the thermal conductivity can be selected from conventional steady-state and unsteady-state methods.

[0050] Specifically, the heat insulation material used to manufacture the first elastic part 112 can be selected from materials known in the art, such as ceramic fiber composite materials, without any particular limitation.

[0051] In some embodiments, the material of the separator 140 is a heat-insulating material. That is, in this embodiment, the separator 140 is made of a heat-insulating material, so the separator 140 has heat insulation capability and can isolate part of the heat transfer when the liquid cooling plate fails and the battery experiences thermal runaway, effectively preventing the spread of thermal runaway.

[0052] Specifically, the thermal conductivity of the insulation material is λ≤0.35W / m·K, meaning that the thermal conductivity of the partition 140 is λ≤0.35W / m·K. Using a material with this thermal conductivity value can effectively prevent the spread of thermal runaway. The insulation material can be selected from materials known in the art, such as ceramic fiber composite materials, without any particular limitation.

[0053] Alternatively, in some embodiments, the material of the separator 140 includes a phase change material. By filling the separator 140 with the phase change material into the matrix, when the liquid cooling plate fails and the battery experiences thermal runaway, the phase change material absorbs heat when the temperature reaches a certain critical point, effectively preventing the spread of thermal runaway. Specifically, the phase change material can be inorganic PCM, organic PCM, or composite PCM. Inorganic PCMs mainly include crystalline hydrated salts, molten salts, metals, or alloys, while organic PCMs mainly include paraffin wax, acetic acid, and other organic substances.

[0054] Furthermore, the thermal conductivity λ' of the phase change material is 1–10 W / mK. For example, λ' can be any value from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or any range between any two values, in W / mK. The phase change temperature T of the phase change material is 65–200 °C. For example, T can be any value from 65, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, or any range between any two values, in °C, which is compatible with the thermal runaway temperature of the battery.

[0055] Please refer to them again. Figure 7 and Figure 8 In some embodiments, the second plate 120 of the liquid cooling plate 100 is also in contact with the battery, and the structure of the second plate 120 is similar to that of the first plate 110. The second plate 120 includes a plurality of second heat-conducting parts 121 and a plurality of second elastic parts 122 spaced apart in the second direction Y, with the second heat-conducting parts 121 and the second elastic parts 122 arranged alternately. In the first direction X, the first heat-conducting portion 111 of the first plate 110 and the second heat-conducting portion 121 of the second plate 120 are arranged facing each other, and the first elastic portion 112 of the first plate 110 and the second elastic portion 122 of the second plate 120 are also arranged facing each other. A separating portion 140 connects the facing first elastic portions 112 and second elastic portions 122, thereby forming a support structure between the first elastic portions 112 and second elastic portions 122. When the second heat-conducting portion 121 is compressed by the battery expansion, the second elastic portion 122, under the support of the supporting structure, is more likely to undergo elastic deformation, reducing the compressive force and making the shape of the entire second plate 120 more closely fit the expansion surface of the battery, ensuring cooling efficiency. "Facing each other" means that along the first direction X, the first elastic portion 112 and the second elastic portion 122 are arranged side by side on a straight line, and their projections along the first direction X completely overlap, or one of their projections is located inside the other.

[0056] Please see Figure 9 , Figure 9The illustration shows a partial cross-sectional view of a liquid cooling plate in a battery pack according to another embodiment of this application. In other embodiments of this application, along the first direction X, the first elastic portion 112 of the first plate 110 and the second elastic portion 122 of the second plate 120 are offset, and a separator 140 is connected between the offset first elastic portion 112 and the second elastic portion 122. Offset means that along the first direction X, the projections of the first elastic portion 112 and the second elastic portion 122 are offset from each other, including completely offset and non-overlapping projections, or partially overlapping projections with the remaining offset portions. In this embodiment, the first elastic portion 112 and the second elastic portion 122 are offset along the first direction X, and the first heat-conducting portion 111 of the first plate 110 and the second heat-conducting portion 121 of the second plate 120 are also offset along the first direction X. The separator 140 can be connected obliquely between the offset first elastic portion 112 and the second elastic portion 122. On the one hand, when the first plate 110 and / or the second plate 120 are compressed by the battery, the partition 140 can support the first elastic part 112 and / or the second elastic part 122, promoting the first elastic part 112 and / or the second elastic part 122 to extend and deform along the second direction Y. On the other hand, since the partition 140 is inclined, the partition 140 has an angle α with the heat-conducting surfaces of the first plate 110 and the second plate 120 (the surface of the first heat-conducting part 111 in contact with the battery and the surface of the second heat-conducting part 121 in contact with the battery). α can be specifically set as needed, for example, preferably 45° to 80°, which helps the liquid cooling plate 100 deform in the first direction X, thereby adapting to the expansion of the battery, providing space for the battery expansion, avoiding compression of the battery, and ensuring the safety performance of the entire pack. The included angle α can be measured by a protractor at the corresponding position of the cross-section of the liquid cooling plate 100. The cross-section is the section of the liquid cooling plate 100 in the plane jointly defined by the first direction X and the second direction Y.

[0057] Furthermore, in some embodiments, the cross-section of the partition 140 in the plane jointly defined by the first direction X and the second direction Y is one or more of a straight line, an arc, and a polygonal line. For example, please refer to... Figure 10 , Figure 10 The illustration shows a partial cross-sectional view of the liquid cooling plate 100 in the third embodiment of this application. In the third embodiment, the cross-section of the partition 140 is a curved structure, which includes broken lines, arcs, and straight lines. Because the partition 140 is configured as described above, it helps the liquid cooling plate 100 deform in the first direction X, thereby accommodating the expansion of the battery, providing space for battery expansion, avoiding battery compression, and ensuring the safety performance of the entire pack.

[0058] In some embodiments, the first heat-conducting part 111 and the first elastic part 112 are an integral structure. An integral structure refers to a one-piece molded structure manufactured using an integral molding process. That is, the first plate 110 is manufactured using an integral molding process, which effectively ensures the integrity of the structure and improves its strength. Furthermore, the first heat-conducting part 111, the first elastic part 112, and the partition part 140 are an integral structure, which, while ensuring structural strength, reduces the number of processing steps for components and lowers the processing difficulty.

[0059] Furthermore, the first heat-conducting part 111, the first elastic part 112, the partition part 140, and the second plate 120 are an integral structure. That is, the first plate 110, the second plate 120, and the partition part 140 are a single integrated structure, meaning the liquid cooling plate 100 is a one-piece molded structure manufactured using an integrated processing technology. For example, it can be manufactured using an extrusion process, reducing processing difficulty, ensuring structural integrity, and improving structural strength.

[0060] Please see Figure 11 , Figure 11 The illustration shows a partial cross-sectional view of the liquid cooling plate 100 in the fourth embodiment of this application. In the fourth embodiment, the first elastic part 112 is provided with a first rounded corner transition section 113 and a second rounded corner transition section 114. The first elastic part 112 is connected to the first heat-conducting part 111 through the first rounded corner transition section 113, and the first elastic part 112 is connected to the partition part 140 through the second rounded corner transition section 114. That is to say, the connection between the first elastic part 112 and the first heat-conducting part 111 and the partition part 140 is all treated with rounded corner transition, which is beneficial to the processing of the product and reduces stress concentration. Especially when the first heat-conducting part 111, the first elastic part 112 and the partition part 140 are an integral structure, the liquid cooling plate 100 can be manufactured by extrusion process. Setting the connection as a rounded corner structure is beneficial to the implementation of the extrusion process and can ensure product yield and service life.

[0061] In some embodiments, the wall thickness of the first heat-conducting part 111 is T1 mm, the wall thickness of the partition part 140 is T3 mm, the minimum wall thickness of the first rounded corner transition section 113 is T2 mm, and T2 / T1≥0.5, that is, the minimum wall thickness T2 mm of the first rounded corner transition section 113 is more than 0.5 times the wall thickness T1 mm of the first heat-conducting part 111; the minimum wall thickness of the second rounded corner transition section 114 is T4 mm, and T4 / T3≥0.5, that is, the minimum wall thickness T4 mm of the second rounded corner transition section 114 is more than 0.5 times the wall thickness T1 mm of the partition part 140. By controlling the thickness of the transition part with rounded corners, the structural strength can be guaranteed, which is beneficial to the processing of the product and ensures the yield of the product. The minimum wall thickness of the first rounded transition section 113 and the second rounded transition section 114 refers to the minimum wall thickness if the distance between the intersection point of the perpendicular line drawn from the tangent point of the surface of the rounded corner and the tangent point of the perpendicular line is the smallest.

[0062] T1, T2, T3, and T4 can all be obtained by measuring the cross-section using tools such as vernier calipers. It should be noted that when the first rounded transition section 113 and the second rounded transition section 114 are provided, the location where the wall thickness changes significantly can be used as the boundary between the first rounded transition section 113 and the first elastic part 112, and between the second rounded transition section 114 and the first elastic part 112. When measuring the cross-section, the location where the wall thickness of each component is approximately uniform can be used as the measurement point to measure the wall thickness of each component. The cross-section is the section of the liquid cooling plate 100 within the plane jointly defined by the first direction X and the second direction Y.

[0063] Furthermore, in some embodiments, by setting the first plate 110, the second plate 120, and the partition 140 to have the same wall thickness, that is, setting the first heat-conducting part 111, the first elastic part 112, the partition 140, and the second plate 120 to have the same wall thickness, it is beneficial to the integral molding of the equipment, facilitates the implementation of the extrusion process, and ensures the yield of the product; wherein, the wall thickness refers to the distance between the two opposite surfaces of each component. In this embodiment, the wall thickness of each component is uniform.

[0064] Please refer to it again. Figures 1-4 In some embodiments, the liquid cooling plate 100 further includes two beams 200, which are respectively disposed at both ends of the first plate 110 in the second direction Y and connected to the first plate 110 and the second plate 120. By providing two beams 200 on the liquid cooling plate 100, the strength of the liquid cooling plate 100 can be effectively guaranteed.

[0065] In some embodiments, the two beams 200 abut against the two side edges of the battery in the second direction Y. From the perspective of the whole pack, when the battery expands and deforms, the battery can be supported and fixed by the beams 200 on both sides, eliminating the need to set beams on the battery pack shell, reducing space occupation, increasing the volumetric energy density of the entire battery pack, and reducing weight.

[0066] In some embodiments, the liquid cooling plate 100 further includes a manifold 300, an inlet pipe 310, and an outlet pipe 320. The two manifolds 300 are respectively disposed at both ends of the liquid cooling plate 100 for diverting coolant to each flow channel 131 or collecting coolant from each flow channel 131. The inlet pipe 310 and the outlet pipe 320 are disposed on the manifold 300 for the inlet and outlet of coolant.

[0067] Accordingly, this application also provides an electrical device, which can be an electrical device such as a new energy vehicle, a storage device, or a computer. This electrical device can possess all the technical features and corresponding beneficial effects of the aforementioned battery pack, which will not be elaborated further here.

[0068] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0069] The battery pack and power device provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized by, The battery and a liquid cooling plate (100) are included. The liquid cooling plate (100) includes a first plate body (110) and a second plate body (120) oppositely arranged in a first direction (X), a plurality of partition portions (140) arranged at intervals in a second direction (Y), the first direction (X) intersects the second direction (Y), and the first plate body (110) is in contact with the battery. The first plate body (110) includes a plurality of first heat-conducting portions (111) and a plurality of first elastic portions (112) arranged at intervals in the second direction (Y), the first heat-conducting portion (111) is connected between two adjacent first elastic portions (112), and the first heat-conducting portion (111) is in contact with the battery. The partition portion (140) is arranged between the first plate body (110) and the second plate body (120), one end of the partition portion (140) is connected to the first elastic portion (112), and the other end of the partition portion (140) is connected to the second plate body (120); along the second direction (Y), the wall thickness of the partition portion (140) is smaller than the size of the first elastic portion (112). The first plate body (110) is configured to be able to move closer to the second plate body (120) and extend in the second direction (Y) by elastic deformation of the first elastic portion (112) when the first plate body (110) is pressed by the battery.

2. The battery pack of claim 1, wherein, The first elastic portion (112) is arranged protruding away from the battery relative to the first heat-conducting portion (111).

3. The battery pack of claim 2, wherein, The cross section of the first elastic portion (112) in the plane defined by the first direction (X) and the second direction (Y) is arc-shaped or polyline-shaped.

4. The battery pack of claim 2, wherein, The size of the first elastic portion (112) protruding away from the battery relative to the first heat-conducting portion (111) is d mm, the maximum size of the liquid cooling plate (100) in the first direction (X) is D mm, and 0.05≤d / D≤0.

95.

5. The battery pack of claim 1, wherein, The elastic modulus of the first elastic portion (112) is e Gpa, the thickness of the first heat-conducting portion (111) is L mm, and 10≤e / L≤685.

6. The battery pack of claim 1, wherein, In a surface of the first plate body (110) facing the battery, a total area of the first heat conductive portion (111) is S1 mm 2 , a total area of the first elastic portion (112) is S2 mm 2 , and 0.1 ≤ S2 / S1 ≤ 5.

7. The battery pack of claim 1, wherein, The material of the first elastic portion (112) is a thermal insulation material; and / or, The material of the partition portion (140) is a thermal insulation material, or the material of the partition portion (140) includes a phase change material.

8. The battery pack of claim 7, wherein, The thermal conductivity of the thermal insulation material is λ≤0.35 W / m·K.

9. The battery pack of claim 7, wherein, The thermal conductivity of the phase change material is λ' of 1-10 W / m·K, and the phase change temperature of the phase change material is T of 65-200℃.

10. The battery pack of claim 1, wherein, The second plate body (120) is in contact with the battery. The second plate body (120) includes a plurality of second heat-conducting portions (121) and a plurality of second elastic portions (122) arranged at intervals in the second direction (Y), the second heat-conducting portion (121) is connected between two adjacent second elastic portions (122), and the second heat-conducting portion (121) is in contact with the battery. Along the first direction (X), the first elastic part (112) and the second elastic part (122) are arranged in alignment, and the partition part (140) is connected between the first elastic part (112) and the second elastic part (122) arranged in alignment; or, Along the first direction (X), the first elastic part (112) and the second elastic part (122) are arranged in misalignment, and the partition part (140) is connected between the first elastic part (112) and the second elastic part (122) arranged in misalignment.

11. The battery pack of claim 1, wherein, The cross section of the partition part (140) in the plane defined by the first direction (X) and the second direction (Y) is one or more of a straight line shape, an arc shape, and a broken line shape.

12. The battery pack of claim 1, wherein, The first heat-conducting part (111), the first elastic part (112), and the partition part (140) are of an integrated structure; or, The first plate body (110), the second plate body (120), and the partition part (140) are of an integrated structure.

13. The battery pack of claim 1, wherein, The first elastic part (112) is provided with a first rounded transition section (113) and a second rounded transition section (114), the first elastic part (112) is connected with the first heat-conducting part (111) through the first rounded transition section (113), and the first elastic part (112) is connected with the partition part (140) through the second rounded transition section (114).

14. The battery pack of claim 13, wherein, The minimum wall thickness of the first rounded transition section (113) is T2 mm, the wall thickness of the first heat-conducting part (111) is T1 mm, and T2 / T1≥0.5; and / or, The minimum wall thickness of the second rounded transition section (114) is T4 mm, the wall thickness of the partition part (140) is T3 mm, and T4 / T3≥0.

5.

15. The battery pack of claim 14, wherein, The wall thicknesses of the first heat-conducting part (111), the first elastic part (112), and the partition part (140) are consistent.

16. The battery pack of claim 1, wherein, The liquid cooling plate (100) further comprises: Two beams (200), the two beams (200) are respectively arranged at two ends of the first plate body (110) in the second direction (Y) and connected with the first plate body (110) and the second plate body (120).

17. The battery pack of claim 16, wherein, The two beams (200) are respectively abutted on two side edges of the battery in the second direction (Y).

18. An electrical device, comprising: A battery pack comprising the battery as claimed in any one of claims 1-17.

Images