Water-cooled plate and battery pack structure

Abstract

The utility model provides water -cooled plate and battery pack structure. Water -cooled plate includes first board and second board. First board is equipped with multiple first recesses to second board, and second board is equipped with multiple second recesses to first board and with first recess position correspondence. Each first recess and each corresponding second recess enclose and form the accommodating cavity of accommodating coolant. First board is equipped with first connecting portion between two first recesses, and second board is equipped with second connecting portion between two second recesses. First connecting portion and second connecting portion mutually abut and mutually move after first board and second board are stressed to cause accommodating cavity to shrink from abutment place to inside. The utility model discloses water -cooled plate when extruding by battery and battery pack, will originally disordered deformation control is directional, namely the directional shrinkage of the accommodating cavity of accommodating coolant, so it will not cause its complete blockage or collapse, so as not to make the heat dissipation effect greatly influenced.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a water-cooled plate and battery pack structure. Background Technology

[0002] With oil resources becoming increasingly depleted, the world is vigorously developing the electric vehicle market to reduce dependence on oil. Compared to gasoline-powered vehicles, electric vehicles have advantages such as zero emissions, high energy efficiency, and energy conservation and emission reduction.

[0003] As the energy provider for electric vehicles, the development of power batteries has become increasingly sophisticated. Vehicle batteries typically consist of multiple power batteries combined into battery modules. Power batteries generate heat during charging, especially under extreme conditions such as high voltage, overcharging, and fast charging. The heat generated by the power battery and its pack structure is even greater under these conditions, and ignoring this heat can lead to accidents such as battery explosions. Currently, there are four main methods for dissipating heat from power batteries: natural cooling, air cooling, liquid cooling, and direct cooling. These methods maintain the battery at a suitable temperature, ensuring the battery pack structure operates at its optimal state.

[0004] Natural cooling utilizes natural air convection for heat exchange. Its advantages include simple structure, low cost, and small footprint. However, its low heat dissipation efficiency makes it unsuitable for high-power cooling needs. Air cooling uses blowing air for heat exchange, offering a relatively simple structure, easy maintenance, and no risk of leakage from liquid cooling systems. It is also relatively inexpensive. However, it is susceptible to external influences, especially at high ambient temperatures, where its cooling effect is less pronounced, similar to a fan. Liquid cooling uses water-cooled plates with coolant circulating between batteries. It boasts a high heat transfer coefficient, large thermal energy, fast cooling efficiency, and significant uniformity of battery heat dissipation. However, it requires a high degree of liquid sealing. Direct cooling involves adding refrigerant to the system for heat dissipation. While it provides fast cooling, it is expensive, requires high refrigerant sealing, and struggles to ensure uniform heat dissipation.

[0005] Of the four heat dissipation methods mentioned above, liquid cooling is currently the most common. However, liquid cooling usually involves channeling coolant into the water cooling plate. The water cooling plate will deform randomly due to the pressure from the battery and battery pack, which may block or crush the flow channels, thus greatly reducing the heat dissipation effect. Utility Model Content

[0006] Based on the above problems, the purpose of this utility model is to provide a water-cooled plate and battery pack structure. When the water-cooled plate of this utility model is squeezed by the battery and battery pack, the originally disordered deformation is controlled to be oriented, that is, the cavity containing the coolant contracts in a directional manner, so as not to cause complete blockage or crushing, and thus not to greatly affect the heat dissipation effect.

[0007] To achieve the above objectives, this utility model provides a water-cooled plate. The water-cooled plate includes a first plate and a second plate. The first plate has multiple first grooves facing the second plate, and the second plate has multiple second grooves facing the first plate and corresponding to the positions of the first grooves. Each first groove and each corresponding second groove encloses a receiving cavity for accommodating coolant. The first plate has a first connecting portion between two adjacent first grooves, and the second plate has a second connecting portion between two adjacent second grooves. The first connecting portion and the second connecting portion abut against each other and move relative to each other after the first plate and the second plate are subjected to force, causing the receiving cavity to contract inward from the abutment point.

[0008] In this utility model of a water-cooled plate, the first groove of the first plate and the second groove of the second plate enclose a cavity for containing coolant. The first connecting portion on the first plate and the second connecting portion on the second plate abut against each other and move relative to each other under force, causing the cavity to contract inward from the abutment point. This controls the originally disordered deformation of the water-cooled plate into a directional state. Under force, the cavity contracts inward from the abutment point, and its spatial size is only partially reduced rather than crushed or blocked. Therefore, the heat dissipation effect of the water-cooled plate is not significantly affected.

[0009] As a technical solution of this utility model, the first connecting part includes a first part, a third part and a second part between the first part and the third part, the second connecting part includes a fourth part, a sixth part and a fifth part between the fourth part and the sixth part, the second part and the fifth part abut against each other, the first part and the fourth part enclose to form a first flow channel penetrating the receiving cavity, and the third part and the sixth part enclose to form a second flow channel penetrating adjacent receiving cavities.

[0010] As a technical solution of this utility model, the first part and the fourth part move closer to each other after the first plate and the second plate are subjected to force.

[0011] As a technical solution of this utility model, the third part and the sixth part move closer to each other after the first plate and the second plate are subjected to force.

[0012] As a technical solution of this utility model, the direction from the first plate to the second plate is defined as the first direction, and the cross-sectional shape of the first flow channel in the first direction is the angle between the opening and the receiving cavity, wherein the angle is less than 90°.

[0013] As a technical solution of this utility model, the direction from the first plate to the second plate is defined as the first direction, and the cross-sectional shape of the second flow channel in the first direction is the angle between the opening and the adjacent receiving cavity, wherein the angle is less than 90°.

[0014] As a technical solution of this utility model, the first connecting part is provided with a first inclined surface facing the second connecting part, and the second connecting part is provided with a second inclined surface corresponding to the first inclined surface facing the first connecting part. The first inclined surface and the second inclined surface abut against each other and move out of position after the first plate and the second plate are subjected to force.

[0015] As a technical solution of this utility model, the direction from the first plate to the second plate is defined as the first direction, and the depth dimension of the first groove in the first direction and the depth dimension of the second groove in the first direction are equal.

[0016] As a technical solution of this utility model, the direction from the first plate to the second plate is defined as the first direction. In the first direction, the maximum dimension of the thickness of the first plate is Tmax, the minimum dimension is Tmin, and Tmax / Tmin = 5~20.

[0017] Another aspect of this utility model provides a battery pack structure, including multiple batteries and a water-cooled plate located between adjacent batteries, wherein the water-cooled plate is the aforementioned water-cooled plate. Attached Figure Description

[0018] Figure 1 This is a top view of the battery pack structure of this utility model.

[0019] Figure 2 for Figure 1 A magnified view of the circled area.

[0020] Figure 3 This is a perspective view of the water-cooled plate of this utility model.

[0021] Figure 4 for Figure 3 A partial sectional view along the AA direction.

[0022] Figure 5 for Figure 4 A partial cross-sectional view of the water-cooled plate after it has been deformed under pressure.

[0023] Figure 6 for Figure 4 The first change diagram.

[0024] Figure 7 for Figure 5 The first change diagram.

[0025] Figure 8 for Figure 4 The second variation diagram.

[0026] Figure 9 for Figure 5 The second variation diagram.

[0027] Figure 10 for Figure 4 A magnified view of the circled area.

[0028] Figure 11 for Figure 5 A magnified view of the circled area.

[0029] Figure 12 for Figure 6 A magnified view of the circled area.

[0030] Figure 13 for Figure 7 A magnified view of the circled area.

[0031] Figure 14 for Figure 8 A magnified view of the circled area.

[0032] Figure 15 for Figure 9 A magnified view of the circled area.

[0033] Component Symbol Explanation 100 - Battery pack structure; 10 - Battery; 30 - Water-cooled plate; 31 - First plate; 311 - First groove; 313 - First connecting part; 3131 - First section; 3133 - Second section; 3135 - Third section; 33 - Second plate; 331 - Second groove; 333 - Second connecting part; 3331 - Fourth section; 3333 - Fifth section; 3335 - Sixth section; 35 - Receiving cavity; 351 - First flow channel; 353 - Second flow channel; 37 - Liquid inlet; 39 - Liquid outlet; D - First direction; Tmax - Maximum thickness of the first plate; Tmin - Minimum thickness of the first plate; T1 - Depth of the first groove; T2 - Depth of the second groove Detailed Implementation To better illustrate the purpose, technical solution, and beneficial effects of this utility model, the following description, in conjunction with specific drawings and embodiments, will further explain the utility model. It should be noted that the following embodiments are further explanations of the utility model and should not be construed as limiting its scope.

[0034] like Figures 1-2 As shown, the battery pack structure 100 includes multiple stacked batteries 10 and water-cooled plates 30 located between adjacent batteries 10. Each water-cooled plate 30 is inserted between the batteries 10 and can be fixed by external components such as a frame structure and a linear isolation plate.

[0035] The battery 10 includes a battery cell, a housing with an internal cavity (not shown in the figure), and a cover plate (not shown in the figure) sealing the housing. The battery cell can be wound or stacked. If wound, the battery cell includes a wound body formed by sequentially stacking and winding a first electrode, a separator, and a second electrode. If stacked, the battery cell is a combination of multiple stacked bodies formed by sequentially stacking a first electrode, a separator, and a second electrode. The battery 10 can contain one or more battery cells. The battery is placed in the cavity of the housing, and the housing and cover plate can be welded, bonded, or fitted together. The housing can be made of stainless steel, aluminum, carbon steel, magnesium alloy, or insulating materials such as ceramic. The housing can be cylindrical or square, preferably square, to facilitate the processing and assembly of the water-cooling plate 30. As a square battery, the cover plate may have a first terminal and a second terminal. The first terminal is electrically connected to one of the terminals in the battery cell. The first terminal can be integrally formed with the cover plate or insulated and fixed to the cover plate. The second terminal is electrically connected to the other terminal in the battery cell. The second terminal is insulated and fixed to the cover plate.

[0036] The outer contour of the water-cooled plate 30 matches the shape of the main surface of the battery casing, thereby improving heat dissipation efficiency. For example... Figure 3 As shown, the water-cooled plate 30 is provided with a coolant inlet 37 for passing coolant and a coolant outlet 39 for discharging coolant. The coolant may be, but is not limited to, a water / glycol mixture, silicone oil, or silicone grease. Continuing as... Figures 4-15 As shown, the water-cooled plate 30 includes a first plate 31 and a second plate 33. The first plate 31 has multiple first grooves 311 facing the second plate 33, and the second plate 33 has multiple second grooves 331 facing the first plate 31 and corresponding to the positions of the first grooves 311. Each first groove 311 and each corresponding second groove 331 encloses a receiving cavity 35 for containing coolant. The first plate 31 has a first connecting portion 313 between two adjacent first grooves 311, and the second plate 33 has a second connecting portion 333 between two adjacent second grooves 331. The first connecting portion 313 and the second connecting portion 333 abut against each other and move relative to each other after the first plate 31 and the second plate 33 are subjected to force, causing the receiving cavity 35 to contract inward from the abutment point. The receiving cavity 35 is not completely filled with coolant, and a certain space is reserved to accommodate the contraction of the receiving cavity 35. The first connecting part 313 on the first plate 31 and the second connecting part 333 on the second plate 33 abut against each other and move relative to each other after being subjected to force, so that the receiving cavity 35 shrinks inward from the abutting point. Thus, the originally disordered deformation of the water-cooling plate 30 is controlled into orientation. After being subjected to force, the receiving cavity 35 shrinks inward from the abutting point. Its space size is only partially reduced rather than being crushed or blocked. Therefore, the heat dissipation effect of the water-cooling plate 30 is not greatly affected.

[0037] This invention, through the structural design of the first connecting portion 313 on the first plate 31 and the second connecting portion 333 on the second plate 33, allows the receiving cavity 35 to be directionally deformed and reduced in size. The structures of the first connecting portion 313 and the second connecting portion 333 can be implemented in various ways. For example... Figures 4-7 and Figures 9-13 As shown, the first connecting portion 313 includes a first portion 3131, a third portion 3135, and a second portion 3133 located between the first portion 3131 and the third portion 3135. The second connecting portion 333 includes a fourth portion 3331, a sixth portion 3335, and a fifth portion 3333 located between the fourth portion 3331 and the sixth portion 3335. The second portion 3133 and the fifth portion 3333 abut against each other. The first portion 3131 and the fourth portion 3331 enclose and form a first flow channel 351 that penetrates the receiving cavity 35. The third portion 3135 and the sixth portion 3335 enclose and form a second flow channel 353 that penetrates the adjacent receiving cavity 35. This first connecting portion 313 and the second connecting portion 333 are equivalent to forming a weak point under stress. Therefore, after the first plate 31 and the second plate 33 are subjected to stress, they deform first at the weak point under stress. Thus, the receiving cavity 35 begins to deform from this point and then contracts inward. The first part 3131 and the fourth part 3331 move closer to each other after the first plate 31 and the second plate 33 are subjected to force, and the third part 3135 and the sixth part 3335 also move closer to each other after the first plate 31 and the second plate 33 are subjected to force, which is equivalent to guiding the deformation path. The direction from the first plate 31 to the second plate 33 is defined as the first direction D. The cross-sectional shape of the first flow channel 351 in the first direction D is the angle between the opening and the receiving cavity 35, and the angle is less than 90°. The cross-sectional shape of the second flow channel 353 in the first direction D is the angle between the opening and the adjacent receiving cavity 35, and the angle is less than 90°. The angles are all less than 90°, which is more conducive to guiding the deformation path.

[0038] Of course, the structures of the first connecting part 313 and the second connecting part 333 can also be as follows: Figures 8-9 and Figures 14-15 As shown, the first connecting part 313 has a first inclined surface (not shown in the figure) facing the second connecting part 333, and the second connecting part 333 has a second inclined surface (not shown in the figure) facing the first connecting part 313 corresponding to the first inclined surface. The first inclined surface and the second inclined surface abut against each other. After the first plate 31 and the second plate 33 are subjected to force, they will move out of alignment due to the influence of the inclined surfaces. Therefore, the receiving cavity 35 will deform from the point where the inclined surfaces abut against each other and then shrink inward.

[0039] Furthermore, the depth dimension T1 of the first groove 311 in the first direction D and the depth dimension T2 of the second groove 331 in the first direction D are equal. The first groove 311 and the second groove 331 can be... Figures 4-5 The arcs shown in 8-9 can also be like... Figures 6-7The triangle mentioned above can also be other shapes, as long as the first groove 311 and the second groove 331 are symmetrical before deformation. In addition, in the first direction D, the maximum dimension of the thickness of the first plate 31 is Tmax, and the minimum dimension is Tmin, where Tmax / Tmin = 5~20. Under this ratio, the first plate 31 can not only maintain sufficient space in the receiving cavity 35 to accommodate coolant for heat dissipation, but also maintain sufficient mechanical strength after the receiving cavity 35 is deformed.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, it is not limited to those listed in the embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A water-cooled plate, characterized in that, The device includes a first plate and a second plate. The first plate has multiple first grooves facing the second plate, and the second plate has multiple second grooves facing the first plate and corresponding to the positions of the first grooves. Each first groove and each corresponding second groove enclose a cavity for containing coolant. The first plate has a first connecting portion between two adjacent first grooves, and the second plate has a second connecting portion between two adjacent second grooves. The first connecting portion and the second connecting portion abut against each other and move relative to each other after the first plate and the second plate are subjected to force, so that the cavity contracts inward from the abutting point.

2. The water-cooled plate according to claim 1, characterized in that, The first connecting portion includes a first part, a third part, and a second part between the first part and the third part. The second connecting portion includes a fourth part, a sixth part, and a fifth part between the fourth part and the sixth part. The second part and the fifth part abut against each other. The first part and the fourth part enclose to form a first flow channel penetrating the receiving cavity. The third part and the sixth part enclose to form a second flow channel penetrating adjacent receiving cavities.

3. The water-cooled plate according to claim 2, characterized in that, The first part and the fourth part move closer to each other after the first plate and the second plate are subjected to force.

4. The water-cooled plate according to claim 2, characterized in that, The third part and the sixth part move closer to each other after the first plate and the second plate are subjected to force.

5. The water-cooled plate according to claim 2, characterized in that, The direction from the first plate to the second plate is defined as the first direction, and the cross-sectional shape of the first flow channel in the first direction is the angle between the opening and the receiving cavity, wherein the angle is less than 90°.

6. The water-cooled plate according to claim 2, characterized in that, The direction from the first plate to the second plate is defined as the first direction, and the cross-sectional shape of the second flow channel in the first direction is the angle between the opening and the adjacent receiving cavity, wherein the angle is less than 90°.

7. The water-cooled plate according to claim 1, characterized in that, The first connecting part has a first inclined surface facing the second connecting part, and the second connecting part has a second inclined surface facing the first connecting part corresponding to the first inclined surface. The first inclined surface and the second inclined surface abut against each other and move out of position after the first plate and the second plate are subjected to force.

8. The water-cooled plate according to claim 1, characterized in that, The direction from the first plate to the second plate is defined as the first direction, and the depth dimension of the first groove in the first direction and the depth dimension of the second groove in the first direction are equal.

9. The water-cooled plate according to claim 1, characterized in that, The direction from the first plate to the second plate is defined as the first direction. In the first direction, the maximum thickness of the first plate is Tmax, and the minimum thickness is Tmin, where Tmax / Tmin = 5~20.

10. A battery pack structure, characterized in that, It includes a plurality of batteries and a water-cooled plate located between adjacent batteries, wherein the water-cooled plate is the water-cooled plate according to any one of claims 1 to 9.

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