Vapor chamber and battery module

Abstract

The utility model provides a vapor chamber and a battery module, the vapor chamber is provided with a first side face and a second side face which are oppositely arranged along the thickness direction of the vapor chamber, the vapor chamber is provided with a notch along the thickness direction of the vapor chamber, and the notch penetrates through the first side face and the second side face. The first side surface and / or the second side surface are / is provided with at least one groove, the groove is communicated with the notch, the notch is used for injecting and storing glue, and the groove is used for storing the glue. According to the vapor chamber provided by the utility model, on one hand, after the battery module is pre-tightened, glue is applied through the notches, so that the glue amount is convenient to control, the flatness of heat-conducting structural glue is improved, excessive glue is effectively reduced, and the production efficiency of products can be improved; and on the other hand, the heat-conducting structural adhesive is stored in the groove and the notch, so that the thickness of the uniform temperature plate is not additionally increased, the length of the battery module can be reduced, and the energy density of the battery system is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a temperature balancing plate and a battery module. Background Art

[0002] At present, in order to improve the working efficiency of the battery cells in the battery system, it is necessary to control the temperature of the battery module to maintain temperature consistency. For example, for the battery pack with liquid cooling on the bottom, the positive and negative poles of the battery cell are located at the top. When the battery cell is fast charged, the temperature at the top of the battery cell is higher, resulting in a greater temperature difference between the top and bottom of the battery cell, and the heat at the top of the battery cell cannot be effectively taken away. For this reason, the prior art will set a vapor chamber (VC) between the battery cells. The vapor chamber is usually used in conjunction with a thermally conductive structural adhesive. Generally, the two sides of the vapor chamber are bonded to the large surface of the battery cell by a thermally conductive structural adhesive to improve the thermal conductivity efficiency. As the battery cell is recycled, the battery cell will expand. The prior art generally uses foam to absorb the expansion of the battery cell, or adds ribs in the center of the vapor chamber to resist the expansion of the battery cell. However, for battery modules using VC temperature equalizer, adding thermally conductive structural adhesive and foam will increase the length of the module, thereby reducing the energy density of the battery system. In addition, the thermally conductive structural adhesive is generally applied along a preset adhesive coating track, and then the battery cells are squeezed against each other, which will lead to insufficient adhesive surface flatness (thick in the center and thin around), adhesive overflow (glue overflowing to the outside of the module affects the flatness of the bottom or side of the module), and the amount of adhesive applied is difficult to control, resulting in low product production efficiency. Utility Model Content

[0003] The purpose of the embodiment of the utility model is to provide a temperature equalizing plate to solve the technical problems existing in the prior art that the battery module is long, the adhesive surface of the thermal conductive structural adhesive in the battery module is uneven, the adhesive is easily overflowed, and the amount of adhesive applied is difficult to control.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a temperature averaging plate, which has a first side surface and a second side surface that are relatively arranged along its thickness direction, and a notch is opened along its thickness direction, and the notch runs through the first side surface and the second side surface, and at least one groove is arranged on the first side surface and / or the second side surface, and the groove is connected to the notch, and the notch is used for injecting glue and storing glue, and the groove is used for storing glue.

[0005] Optionally, the first side surface and the second side surface are both provided with a plurality of grooves, the plurality of grooves and the notches on the first side surface are interconnected to form at least one glue storage space, the plurality of grooves and the notches on the second side surface are interconnected to form at least one glue storage space, and the glue storage space has at least one glue injection port and at least one glue overflow port.

[0006] Optionally, the glue injection port and the glue overflow port are both located at the end of the temperature homogenizing plate along the height direction.

[0007] Optionally, the groove structures on the first side surface and the second side surface are the same.

[0008] Optionally, the glue injection port has a V-shaped opening.

[0009] Optionally, the opening size of the glue injection port is larger than the opening size of the glue overflow port.

[0010] Optionally, the glue storage space is M-shaped, S-shaped, Z-shaped, N-shaped or any combination thereof.

[0011] Optionally, the areas of the first side surface and the second side surface are both B, and the projection area of ​​the groove on the first side surface and / or the second side surface is A, and the ratio of A / B is 50%-80%.

[0012] Optionally, in the thickness direction of the temperature homogenizing plate, the depth of the groove is L1, the thickness of the temperature homogenizing plate is L2, and the ratio of L1 / L2 is 20%-40%.

[0013] Optionally, the glue storage area of ​​the notch is larger than the glue storage area of ​​the groove.

[0014] The utility model also provides a battery module, comprising a plurality of battery cells arranged side by side along the thickness direction, and a temperature averaging plate as described above and arranged between two adjacent battery cells.

[0015] The beneficial effect of the temperature equalizing plate provided by the utility model is that: compared with the prior art, the temperature equalizing plate of the utility model has a first side surface and a second side surface that are relatively arranged along its thickness direction, and a notch is also opened along the thickness direction, the notch runs through the first side surface and the second side surface, and at least one groove is arranged on the first side surface and / or the second side surface, the groove is connected to the notch, the notch is used for glue injection and glue storage, and the groove is used for glue storage; on the one hand, when the battery module is pre-tightened, glue is applied through the notch, which is convenient for controlling the amount of glue, improving the flatness of the thermal conductive structural glue, effectively reducing glue overflow, and improving product production efficiency; on the other hand, since the thermal conductive structural glue is stored in the groove and the notch, the thickness of the temperature equalizing plate will not be increased additionally, the length of the battery module can be reduced, and the energy density of the battery system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of the three-dimensional structure of a temperature equalizing plate provided in one embodiment of the utility model;

[0018] Figure 2 A schematic diagram of the main structure of a temperature equalizing plate provided in one embodiment of the utility model;

[0019] Figure 3 A schematic diagram of the glue path and exhaust path of a temperature homogenizing plate provided in one embodiment of the utility model;

[0020] Figure 4 A schematic diagram of the front view of a temperature equalizing plate provided in another embodiment of the utility model;

[0021] Figure 5 A schematic diagram of the main structure of a temperature equalizing plate provided in another embodiment of the utility model;

[0022] Figure 6 A schematic diagram of the three-dimensional structure of a battery module provided by an embodiment of the utility model;

[0023] Figure 7 A schematic diagram of the exploded structure of a battery module provided in one embodiment of the utility model.

[0024] Among them, the reference numerals in the figure are:

[0025] 100-battery module; 10-temperature averaging plate; 101-first side; 102-glue storage space; 11-notch; 111-glue injection port; 12-groove; 121-glue overflow port; 20-battery cell; 30-end plate; 40-thermal insulation pad; 50-liquid cooling plate. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] At present, the temperature plate is usually made of copper plate, and the inner wall has a microstructure to form a closed vacuum cavity. When the heat is transferred to the evaporation zone, the coolant (such as pure water or refrigerant) at the bottom of the vacuum cavity absorbs the heat and evaporates and diffuses into the vacuum cavity. These vapors condense when they encounter the colder wall surface, releasing latent heat. The condensed liquid returns to the bottom of the vacuum cavity through the fine capillary structure in the vacuum cavity and evaporates again, thus forming a continuous liquid-vapor cycle to achieve uniform temperature.

[0031] Please also read Figure 1 and Figure 2 , the temperature averaging plate 10 provided by the embodiment of the utility model is now described. The temperature averaging plate 10 is a plate-like structure, and the temperature averaging plate 10 has a first side surface 101 and a second side surface that are arranged oppositely along its thickness direction. In the battery module, the first side surface 101 and the second side surface are both planes perpendicular to the stacking direction of the battery cells; the temperature averaging plate 10 is also provided with a notch 11 along its thickness direction, and the notch 11 penetrates the first side surface 101 and the second side surface, that is, the notch 11 penetrates the temperature averaging plate 10 along the thickness direction of the temperature averaging plate 10; at least one groove 12 is provided on the first side surface 101 and / or the second side surface, and the groove 12 is connected to the notch 11, wherein the notch 11 is used for glue injection and glue storage, and the groove 12 is used for glue storage. When the battery module is pre-tightened, the thermal conductive structural glue is injected into the groove 12 through the notch 11, and with the injection of the thermal conductive structural glue, the thermal conductive structural glue is finally filled in the notch 11, thereby realizing the injection of the thermal conductive structural glue into the first side surface 101 and / or the second side surface of the temperature averaging plate 10.

[0032] It can be understood that the above-mentioned groove 12 is formed by the first side 101 and the second side of the temperature equalizing plate 10 being recessed inward, thereby forming a space for accommodating the thermal conductive structural adhesive; correspondingly, a convex portion can also be provided on the edges of the first side 101 and the second side of the temperature equalizing plate 10, thereby forming a space for accommodating the thermal conductive structural adhesive.

[0033] Compared with the prior art, the temperature equalizing plate 10 provided in the embodiment of the utility model has a first side surface 101 and a second side surface that are relatively arranged along its thickness direction, and a notch 11 is also opened along the thickness direction, the notch 11 runs through the first side surface 101 and the second side surface, and at least one groove 12 is arranged on the first side surface 101 and / or the second side surface, the groove 12 is connected to the notch 11, the notch 11 is used for glue injection and glue storage, and the groove 12 is used for glue storage; on the one hand, when the battery module is pre-tightened, glue is applied through the notch 11, which is convenient for controlling the amount of glue, improving the flatness of the thermal conductive structural glue, effectively reducing glue overflow, and improving product production efficiency; on the other hand, since the thermal conductive structural glue is stored in the groove 12 and the notch 11, the thickness of the temperature equalizing plate 10 will not be increased additionally, the length of the battery module can be reduced, and the energy density of the battery system can be improved.

[0034] In addition, the temperature averaging plate 10 of the embodiment of the utility model can also enhance the temperature averaging effect of the temperature averaging plate 10 under the condition of the same cell spacing. For example, the thickness L2 of the existing temperature averaging plate 10 is 0.8mm, and the glue thickness on both sides is 0.3mm. Then the cell spacing is L2 plus twice the glue thickness, that is, 0.8mm+2*0.3mm=1.4mm; in the embodiment of the utility model, please refer to Figure 1 , the cell spacing is equal to the thickness L2 of the temperature plate 10, that is, L2 = 1.4mm, and the depth L1 of the groove 12 on the first side 101 and the second side is equal to the glue thickness 0.3mm. Therefore, when the cell spacing is the same, the thickness L2 of the temperature plate 10 can be set to be larger, and its temperature equalization effect is better.

[0035] In one embodiment of the present invention, at least one groove 12 is provided on the first side surface 101 . The groove 12 is directly or indirectly connected to the notch 11 , so that the thermal conductive structural adhesive can be injected from the notch 11 into the groove 12 .

[0036] In another embodiment of the utility model, at least one groove 12 is provided on the second side surface, and the groove 12 is directly or indirectly connected to the notch 11 , so that the thermal conductive structural adhesive can be injected from the notch 11 into the groove 12 .

[0037] In another embodiment of the present invention, please refer to Figure 1At least one groove 12 is provided on the first side 101 and the second side, and the grooves 12 on the first side 101 and the second side are directly or indirectly connected to the notch 11, so that the thermal conductive structural adhesive can be injected into the groove 12 from the notch 11.

[0038] In one embodiment of the present invention, please refer to Figure 1 and Figure 2 , a plurality of grooves 12 connected to the notch 11 are provided on both the first side 101 and the second side, and the plurality of grooves 12 and the notch 11 on the first side 101 are connected to each other and form at least one glue storage space 102, and the plurality of grooves 12 and the notch 11 on the second side are connected to each other and form at least one glue storage space 102. In this embodiment, the glue storage space 102 is a space for storing thermal conductive structural glue. Each glue storage space 102 has at least one glue injection port 111 and at least one glue overflow port 121, the glue injection port 111 is mainly used for glue injection, and the glue overflow port 121 is mainly used for exhaust.

[0039] In one embodiment of the present invention, the glue injection port 111 and the glue overflow port 121 are located at the ends of the temperature homogenizing plate 10 along the height direction. Figure 6 The height direction of the temperature averaging plate 10 refers to the direction perpendicular to the injection plate when the temperature averaging plate 10 and the battery cell are stacked. The injection port 111 and the overflow port 121 are arranged at the ends of the temperature averaging plate 10 along the height direction to facilitate injection and exhaust.

[0040] In an embodiment of the present invention, the grooves 12 on the first side surface 101 and the second side surface have the same structure, so that the heat dissipation of the battery cells on both sides of the temperature vapor chamber 10 is more uniform.

[0041] In one embodiment of the utility model, the glue storage space 102 can be M-shaped, S-shaped, Z-shaped, N-shaped or any combination thereof. Among them, any combination of shapes includes a combination of any two, three or four of M-shaped, S-shaped, Z-shaped and N-shaped. In this embodiment, the M-shaped, S-shaped, Z-shaped and N-shaped glue storage spaces 102 are all common battery core glue coating tracks, which are convenient for production.

[0042] In one embodiment of the present invention, please refer to Figure 1, the notch 11 extends from the upper end to the lower end of the temperature homogenizing plate 10 in the height direction, and the projection of the notch 11 on the first side surface 101 or the second side surface includes a rectangle and an arc; on the first side surface 101 and on both sides of the rectangular notch 11, long strip-shaped grooves 12 are symmetrically arranged, one side of which specifically includes three grooves 12 arranged downwardly away from the notch 11 and parallel to each other, one groove 12 parallel to the rectangular notch 11, and one groove 12 located below the arc-shaped notch 11, and these grooves 12 are directly or indirectly connected to the notch 11; accordingly, the number, position and shape of the grooves 12 arranged on the second side surface are the same as those on the first side surface 101. It can be understood that the three grooves 12 arranged downwardly away from the notch 11 and parallel to each other can also be inclined upward toward the notch 11.

[0043] In this embodiment, the glue storage space 102 has a glue injection port 111 and two glue overflow ports 121, and the two glue overflow ports 121 are respectively located on both sides of the glue injection port 111, and the glue injection port 111 and the glue overflow port 121 are located at the ends of the temperature homogenizing plate 10 along the height direction. Figure 3 , where the solid arrows represent the glue path, and the hollow arrows represent the gas exhaust path. First, the three parallel grooves 12 are inclined downward away from the notch 11, and the groove 12 located at the bottom of the notch 11 first stores glue, and the gas is discharged upward. As the amount of glue injection increases, all grooves 12 and notches 11 are covered in turn.

[0044] In another embodiment of the present invention, please refer to Figure 4 The temperature balancing plate 10 of this embodiment and Figure 1 The difference between the temperature equalizing plate 10 in the embodiment is that the projection of the notch 11 on the first side surface 101 or the second side surface is a rectangle; on the first side surface 101 and on both sides of the rectangular notch 11, long strip-shaped, triangular and trapezoidal grooves 12 are symmetrically arranged, one side of which specifically includes two grooves 12 parallel to the rectangular notch 11, a triangular groove 12 located above the side of the rectangular notch 11, a trapezoidal groove 12 located below the side of the rectangular notch 11, and a strip-shaped groove 12 located below the rectangular notch 11, and these grooves 12 are directly or indirectly connected to the notch 11.

[0045] In another embodiment of the present invention, please refer to Figure 5 The temperature balancing plate 10 of this embodiment and Figure 1The difference between the heat spreader 10 in the embodiment is that the projection of the notch 11 on the first side 101 or the second side includes a rectangle and a circle; grooves 12 are symmetrically arranged on the first side 101 and on both sides of the rectangular notch 11, and the grooves 12 are arranged around the notch 11, and the overall shape of the grooves 12 is a cross, and these grooves 12 are directly connected to the notch 11. In this embodiment, the glue storage space 102 has a glue injection port 111 and two glue overflow ports 121, and the two glue overflow ports 121 are respectively located on both sides of the glue injection port 111, the glue injection port 111 is located at the end of the heat spreader 10 in the height direction, and the two glue overflow ports 121 are located at the two ends of the heat spreader 10 in the width direction.

[0046] In one embodiment of the present invention, the glue injection port 111 of the notch 11 has a V-shaped opening to facilitate glue injection and prevent glue overflow.

[0047] In one embodiment of the present invention, the opening size of the glue injection port 111 is larger than the opening size of the glue overflow port 121, that is, the cross-sectional area of ​​the glue injection port 111 is larger than the cross-sectional area of ​​the glue overflow port 121, so as to facilitate glue injection and prevent glue overflow.

[0048] In one embodiment of the present invention, the glue storage area of ​​the notch 11 is larger than the glue storage area of ​​the groove 12. Such a configuration can also facilitate glue injection and prevent glue overflow.

[0049] In one embodiment of the present invention, please refer to Figure 1 , the area of ​​the first side 101 and the second side are both B, and the projection area of ​​the groove 12 on the first side 101 and / or the second side is A, then the ratio of A / B is 50%-80%, that is, the sum of the projection areas of the grooves 12 on the first side 101 and the second side accounts for 50%-80% of the area of ​​the first side 101 or the second side. It can be understood that when the value of A / B is larger, the area of ​​the thermal conductive structure adhesive is larger, and the bonding effect of the temperature equalizing plate 10 is better, but the temperature equalizing effect of the temperature equalizing plate 10 will decrease with the increase of the value of A / B. Therefore, in this embodiment, by setting the ratio of A / B to 50%-80%, the temperature equalizing effect of the temperature equalizing plate 10 can be met while satisfying the bonding effect of the temperature equalizing plate 10. In specific applications, the ratio of A / B can be 50%, 55%, 60%, 65%, 70%, 75% or 80%, etc.

[0050] In one embodiment of the present invention, please refer to Figure 1, in the thickness direction of the temperature equalizing plate 10, the depth of the groove 12 is L1, and the thickness of the temperature equalizing plate 10 is L2, then the ratio of L1 / L2 is 20%-40%. It can be understood that when the value of L1 / L2 is larger, the volume of the thermal conductive structural adhesive is larger, and the bonding effect of the temperature equalizing plate 10 is better, but the temperature equalization effect of the temperature equalizing plate 10 will decrease with the increase of the value of L1 / L2. Therefore, in this embodiment, by setting the ratio of L1 / L2 to 20%-40%, the temperature equalization effect of the temperature equalizing plate 10 can be satisfied while satisfying the bonding effect of the temperature equalizing plate 10. In specific applications, the ratio of L1 / L2 can be 20%, 25%, 30%, 35% or 40%, etc.

[0051] See also Figure 6 and Figure 7 The embodiment of the utility model further provides a battery module 100, which includes the above-mentioned temperature averaging plate 10, battery cells 20, end plates 30, thermal insulation pads 40 and liquid cooling plates 50. Among them, a plurality of battery cells 20 are arranged side by side along the thickness direction thereof, the temperature averaging plate 10 is arranged between two adjacent battery cells 20, end plates 30 are respectively arranged at both ends of the battery module 100 along the length direction thereof, thermal insulation pads 40 are arranged between the end plates 30 and the battery cells 20 located at the ends, and the temperature averaging plate 10, battery cells 20, end plates 30 and thermal insulation pads 40 are all placed on the liquid cooling plates 50.

[0052] The battery module 100 provided in the embodiment of the utility model adopts the above-mentioned temperature equalizing plate 10. On the one hand, after the battery module 100 is pre-tightened, glue is applied through the notch 11, which facilitates the control of the glue amount, improves the flatness of the thermal conductive structural glue, effectively reduces glue overflow, and improves product production efficiency; on the other hand, since the thermal conductive structural glue is stored in the groove 12 and the notch 11, the thickness of the temperature equalizing plate 10 will not be increased additionally, so the length of the battery module 100 can be reduced, thereby improving the energy density of the battery system.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A temperature equalizing plate, characterized in that: The temperature equalizing plate has a first side surface and a second side surface that are relatively arranged along its thickness direction. The temperature equalizing plate has a notch along its thickness direction. The notch runs through the first side surface and the second side surface. At least one groove is arranged on the first side surface and / or the second side surface. The groove is connected to the notch. The notch is used for injecting and storing glue, and the groove is used for storing glue.

2. The temperature equalizing plate according to claim 1, characterized in that: The first side surface and the second side surface are both provided with a plurality of grooves, the plurality of grooves and the notches on the first side surface are interconnected to form at least one glue storage space, the plurality of grooves and the notches on the second side surface are interconnected to form at least one glue storage space, and the glue storage space has at least one glue injection port and at least one glue overflow port.

3. The temperature equalizing plate according to claim 2, characterized in that: The glue injection port and the glue overflow port are both located at the end of the temperature homogenizing plate along the height direction.

4. The temperature equalizing plate according to claim 2, characterized in that: The grooves on the first side surface and the second side surface have the same structure.

5. The temperature equalizing plate according to claim 3, characterized in that: The glue injection port has a V-shaped opening.

6. The temperature equalizing plate according to claim 3, characterized in that: The opening size of the glue injection port is larger than the opening size of the glue overflow port.

7. The temperature equalizing plate according to claim 2, characterized in that: The glue storage space is in the shape of M, S, Z, N or any combination thereof.

8. The temperature equalizing plate according to any one of claims 1 to 7, characterized in that: The areas of the first side surface and the second side surface are both B, and the projection area of ​​the groove on the first side surface and / or the second side surface is A, and the ratio of A / B is 50%-80%.

9. The temperature equalizing plate according to any one of claims 1 to 7, characterized in that: In the thickness direction of the temperature homogenizing plate, the depth of the groove is L1, the thickness of the temperature homogenizing plate is L2, and the ratio of L1 / L2 is 20%-40%.

10. The temperature equalizing plate according to any one of claims 1 to 7, characterized in that: The glue storage area of ​​the notch is larger than the glue storage area of ​​the groove.

11. A battery module, characterized in that: It comprises a plurality of battery cells arranged side by side in the thickness direction, and a temperature averaging plate as claimed in any one of claims 1 to 10 and arranged between two adjacent battery cells.

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