Vapor chamber, battery cell, and battery module

Abstract

Provided in the present application are a vapor chamber, a battery cell, and a battery module, relating to the technical field of batteries. The vapor chamber comprises a first substrate and a second substrate, the second substrate and the first substrate are connected to one another so as to define a closed heat exchange cavity, and a heat exchange medium is provided in the heat exchange cavity; a plurality of first protrusions are provided on the side of the second substrate facing the first substrate and protrude towards the first substrate, the first protrusions are located within the heat exchange cavity, and the first protrusions are spaced apart from the first substrate.

Description

Uniform temperature plate, battery monomer and battery module

[0001] The present application claims priority to the Chinese patent application No. 202421551184.6, filed on July 02, 2024, to the Chinese Patent Office, the content of the above application being hereby incorporated by reference into the present application. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a uniform temperature plate, a battery monomer and a battery module. BACKGROUND

[0003] The battery monomer is one of the important components of the battery. The battery monomer is generally composed of a shell, an electrode assembly arranged in the shell, and an electrode terminal arranged on the shell. The battery generates heat during charging and discharging, which affects the performance of the battery. Therefore, in the related art, a uniform temperature plate is attached to the outer wall of the battery monomer to dissipate heat from the battery monomer, so as to prevent local overheating of the battery, thereby improving the overall thermal stability.

[0004] The uniform temperature plate is a component with a wick structure inside and a cavity filled with a fluid heat exchange medium. The cavity is divided into a heated area and a cold end. The fluid heat exchange medium absorbs heat in the heated area and evaporates into a gaseous heat exchange medium. The gaseous heat exchange medium diffuses to the cold end away from the heated area, condenses into liquid heat exchange medium at the cold end, and thus achieves the purpose of heat dissipation. The gaseous heat exchange medium condenses into liquid and returns to the heated area by capillary force of the wick structure for evaporation and heat absorption again. SUMMARY

[0005] Since the uniform temperature plate has a cavity, its strength is low and its impact resistance is poor.

[0006] The present application provides a uniform temperature plate, a battery monomer and a battery module, which can improve the strength of the uniform temperature plate.

[0007] In a first aspect, the present application provides a uniform temperature plate, which comprises a first substrate and a second substrate, the two substrates are connected to each other to define a closed heat exchange cavity, and a heat exchange medium is arranged in the heat exchange cavity; wherein a plurality of first protrusions are protruded from the side of the second substrate facing the first substrate to the first substrate, the first protrusions are located in the heat exchange cavity, and the first protrusions are arranged in a spaced manner with the first substrate.

[0008] In a second aspect, the present application provides a battery monomer, which comprises a shell and an electrode assembly, the shell has a receiving cavity; the electrode assembly is arranged in the receiving cavity; wherein at least part of the shell is the aforementioned uniform temperature plate.

[0009] In a third aspect, the present application provides a battery module, which comprises the battery cell as described above, and a plurality of the battery cells are connected in series or in parallel; or the battery module comprises the battery cell and the uniform temperature plate as described above, the battery cell has a plurality of battery cells arranged in a first direction in sequence, and the uniform temperature plate has a plurality of uniform temperature plates staggered with the plurality of battery cells along the arrangement direction of the battery cells, and the uniform temperature plate is in contact with the adjacent battery cell. Advantages

[0010] In the present application, by arranging the first protrusion and spacing the first protrusion from the first substrate, support can be provided between the first substrate and the second substrate when the uniform temperature plate is deformed by the impact so that the first substrate is close to the second substrate. In this way, the strength of the uniform temperature plate can be improved, and the impact resistance can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] FIG. 1 is a structural schematic diagram of a heat management plate according to an embodiment of the present application;

[0012] FIG. 2 is a sectional view of B-B in FIG. 1;

[0013] FIG. 3 is an enlarged view of C in FIG. 2;

[0014] FIG. 4 is an enlarged view of D in FIG. 3;

[0015] FIG. 5 is a structural schematic diagram of a second substrate according to an embodiment of the present application;

[0016] FIG. 6 is a structural schematic diagram of a battery cell according to an embodiment of the present application;

[0017] FIG. 7 is a structural schematic diagram of a battery module according to an embodiment of the present application;

[0018] FIG. 8 is a structural schematic diagram of another battery module according to an embodiment of the present application.

[0019] REFERENCE SIGNS:

[0020] 002 - housing; 022 - shell; 023 - top cover;

[0021] 003 - uniform temperature plate; 031 - first substrate; 032 - second substrate; 321 - groove; 322 - first protrusion; 324 - slot body; 327 - body part; 328 - connecting part; 033 - heat exchange cavity;

[0022] 004 - battery cell; 041 - electrode terminal;

[0023] 006 - battery module. Embodiments of the present application

[0024] Referring to FIG. 1 to FIG. 3, FIG. 1 is a structural schematic diagram of a heat management plate provided by an embodiment of the present application, FIG. 2 is a sectional view of B-B in FIG. 1, and FIG. 3 is an enlarged view of C in FIG. 2. An embodiment of the present application provides a heat spreader 003. The heat spreader 003 includes a first substrate 031 and a second substrate 032. The two substrates are connected to each other to define a closed heat exchange cavity. A heat exchange medium is arranged in the heat exchange cavity. The second substrate 032 is provided with a plurality of first protrusions 323 on the side facing the first substrate 031. The first protrusions 323 are located in the heat exchange cavity 033. The first protrusions 323 are arranged in a spaced manner with the first substrate 031.

[0025] Specifically, one of the first substrate 031 and the second substrate 032 can be configured to be in contact with a heat source. Alternatively, the first substrate 031 and the second substrate 032 can be in contact with two heat sources respectively to cool and dissipate heat of the heat sources.

[0026] It can be understood that the heat source is a component that needs to be cooled and dissipated. For example, when the heat spreader 003 is applied to a battery, the heat source can be a battery cell.

[0027] The heat spreader 003 further includes a wick arranged in the heat exchange cavity 033. The heat exchange cavity 033 includes a heated area and a cold end. The heat exchange medium evaporates into gaseous heat exchange medium after absorbing heat in the heated area, diffuses to the cold end away from the heated area, condenses into liquid heat exchange medium in the cold end, and flows back to the heated area under the capillary force of the wick to evaporate and absorb heat again.

[0028] For example, the material of the first substrate 031 and the second substrate 032 can be metal material, including but not limited to stainless steel, copper, aluminum, copper alloy, and aluminum alloy.

[0029] In addition, the heat exchange medium includes but is not limited to pure water, ethanol, distilled water, heat-conducting liquid, cooling liquid, and phase-change medium.

[0030] In the embodiment, by arranging the first protrusions 323 and spacing the first protrusions 323 from the first substrate 031, when the vapor chamber 003 is impacted and the second substrate 032 deforms to be close to the first substrate 031, the first protrusions 323 abut against the first substrate 031, thereby providing support between the first substrate 031 and the second substrate 032. In this way, on the one hand, the rigidity of the vapor chamber 003 can be improved based on the abutment of the first protrusions 323 against the first substrate 031, thereby improving the strength of the vapor chamber 003 and further improving the impact resistance. On the other hand, when the vapor chamber 003 is impacted, the second substrate 032 can elastically deform towards the first substrate 031 or the first substrate 031 can elastically deform towards the second substrate 032 based on the spacing, so that a portion of the impact can be absorbed based on the elastic deformation, thereby reducing the impact force on the component using the vapor chamber 003 for heat dissipation, and further avoiding damage to the component and improving the reliability of the component.

[0031] Furthermore, by spacing the first protrusions 323 from the first substrate 031, the contact area of the fluid with the first substrate 031 can be increased, thereby improving the heat exchange efficiency. At the same time, the pressure drop of the fluid flowing from the hot area to the cold end can also be reduced, so that the fluid has a faster flow rate, thereby improving the heat exchange efficiency.

[0032] In addition, the first protrusions 323 can also act as turbulence columns, which can have a turbulence effect on the heat exchange medium, thereby increasing the heat dissipation effect and the uniformity of heat dissipation.

[0033] Referring to FIG. 4, which is an enlarged view of D in FIG. 3. In an embodiment, the spacing between the first protrusions 323 and the first substrate 031 is s, which satisfies: 0 < s ≤ 0.1 mm.

[0034] Exemplarily, the spacing s includes but is not limited to 0.01 mm, 0.21 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.065 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm.

[0035] Specifically, 0.5 mm ≤ s ≤ 1 mm.

[0036] In the embodiment, by the above limitation, on the one hand, the first protrusions 323 and the first substrate 031 have a spacing therebetween, so that when impacted, the second substrate 032 deforms based on the spacing, thereby allowing the second substrate 032 to absorb a portion of the impact, and further reducing the impact force on the component using the vapor chamber 003 for heat dissipation. On the other hand, the spacing is not too large, so that the support of the first protrusions 323 on the second substrate 032 is not weak, and the vapor chamber 003 has appropriate strength to resist impact.

[0037] In an embodiment, the first substrate 031 is configured to contact the heat source.

[0038] It can be understood that the first substrate 031 is not connected with the first protrusions 323, and thus the flatness of the first substrate 031 is greater than that of the first substrate 031.

[0039] Based on this, in the present embodiment, by the above-mentioned arrangement, the first substrate 031 with at least greater flatness of the vapor chamber 003 can be contacted with the heat source, so that the fit of the vapor chamber 003 and the heat source can be increased, so as to increase the area of the contact surface between the vapor chamber 003 and the heat source, and thus the heat conduction efficiency between the vapor chamber 003 and the heat source can be improved. In this way, the heat dissipation efficiency of the vapor chamber 003 can be improved.

[0040] Please refer to FIG. 1, in an embodiment, the second substrate 032 is provided with a plurality of grooves 321 on the side away from the first substrate 031.

[0041] Optionally, in the direction perpendicular to the first substrate 031, the grooves 321 are arranged opposite to the heat exchange cavities, as shown in FIG. 3.

[0042] It can be understood that the grooves 321 can be circular, rectangular, elliptical, etc. Specifically, the grooves 321 are circular grooves 321, and there are a plurality of grooves 321, which are distributed in a matrix along the long side and the wide side of the first substrate 031.

[0043] In the present embodiment, by the above-mentioned arrangement, the area of the surface of the second substrate 032 away from the first substrate 031 can be increased, so that the area of the heat exchange surface of the vapor chamber 003 is increased, and thus the heat dissipation efficiency of the vapor chamber 003 can be improved.

[0044] Please refer to FIG. 3 or FIG. 4, in an embodiment, the grooves 321 correspond to the first protrusions 322 one by one. The grooves 321 extend into the corresponding first protrusions 322.

[0045] It can be understood that in order to control the weight and size of the component using the vapor chamber 003, the thickness of the second substrate 032 is small. Therefore, the depth of the groove 321 formed directly on the second substrate 032 is small, so that the arrangement of the groove 321 has a small effect on the increase of the area of the heat exchange surface of the vapor chamber 003.

[0046] Based on this, in the present embodiment, by the above-mentioned arrangement, the depth of the groove 321 can be increased on the basis of controlling the overall size and weight of the vapor chamber 003, so that the area of the heat exchange surface of the vapor chamber 003 can be increased. In this way, the heat dissipation efficiency of the vapor chamber 003 can be improved.

[0047] The groove 321 and the first protrusion 322 can be punched on the second substrate 032. Since the groove 321 and the first protrusion 322 correspond to each other, the groove 321 and the first protrusion 322 can be formed by one-time punching.

[0048] Referring to FIG. 4, in an embodiment, the depth d of the groove 321 in a direction perpendicular to the first substrate 031 satisfies 0.5mm≤d≤1mm.

[0049] For example, d includes but is not limited to 0.5mm, 0.58mm, 0.6mm, 0.65mm, 0.72mm, 0.75mm, 0.78mm, 0.8mm, 0.95mm, 1mm.

[0050] Specifically, 0.6mm≤d≤1mm.

[0051] In the embodiment, by the above setting, on the one hand, the groove 321 has sufficient depth to increase the area of the heat exchange surface of the uniform temperature plate 003; on the other hand, the depth of the groove 321 can be prevented from being too large to affect the arrangement of the first protrusion 322 and the inner cavity, thereby reducing the design difficulty.

[0052] Referring to FIG. 4, in an embodiment, the cross section of the groove 321 is circular, and the diameter of the end of the groove 321 away from the first substrate 031 is φ, which satisfies 0.5mm≤φ≤1mm.

[0053] The cross-sectional area of the groove 321 refers to the cross section of the groove 321 parallel to the first substrate 031.

[0054] For example, φ includes but is not limited to 0.5mm, 0.58mm, 0.6mm, 0.65mm, 0.72mm, 0.75mm, 0.78mm, 0.8mm, 0.95mm, 1mm.

[0055] Specifically, 0.6mm≤φ≤0.9mm.

[0056] In the embodiment, by the above limitation, on the one hand, the diameter of the groove 321 can be prevented from being too small to cause large forming difficulty, thereby reducing the manufacturing cost; on the other hand, stress concentration caused by the diameter of the groove 321 being too large can be reduced, thereby avoiding material fatigue and improving the strength of the uniform temperature plate 003.

[0057] Referring to FIG. 3 or FIG. 4, in an embodiment, the thickness of the part of the first substrate 031 configured to form the heat exchange cavity 033 is greater than the thickness of the part of the second substrate 032 configured to form the heat exchange cavity 033.

[0058] In the embodiment, since the first substrate 031 is configured to be in contact with the heat source, the rigidity of the first substrate 031 can be improved by the above arrangement, so that the first substrate 031 can be prevented from being deformed, and the flatness of the first substrate 031 can be ensured. In this way, the adhesion between the first substrate and the heat source can be improved, so that the heat dissipation efficiency can be improved.

[0059] In addition, when an impact is applied, the impact is usually applied from the outside of the heat source to the inside of the heat source, i.e., the second substrate 032 is deformed towards the first substrate 031. Based on this, the first substrate 031 has greater rigidity by the above arrangement, so as to protect the heat source and avoid damage to the heat source.

[0060] Referring to FIG. 5, FIG. 5 is a structural schematic view of the second substrate 032 provided in the embodiment of the present application. In an embodiment, a groove 324 is arranged on a side of the second substrate 032 facing the first substrate 031. The first substrate 031 closes the opening of the groove 324 to form a heat exchange cavity.

[0061] For example, the second substrate 032 is sealed and welded with the first substrate 031 to close the opening of the groove 324.

[0062] In the embodiment, the above arrangement can make the vapor chamber 003 have the heat exchange cavity for containing the heat exchange medium, and the vapor chamber 003 has a simple structure and is easy to manufacture.

[0063] In addition, when the first substrate 031 is in contact with the heat source, the groove 324 is arranged on the second substrate 032, so that the first substrate 031 has a flat structure, the flatness of the first substrate 031 can be improved, and the adhesion between the first substrate 031 and the heat source can be improved. In this way, the area of the contact surface between the first substrate 031 and the heat source can be increased, so that the heat dissipation efficiency can be improved.

[0064] Referring to FIG. 5, in an embodiment, the second substrate 032 includes a body part 327 and a connecting part 328 connected with the periphery of the body part 327. The part of the body part 327 close to the first substrate 031 is thinned to form the groove 324. The connecting part 328 is configured to be connected with the first substrate 032, so that the space between the body part 327 and the first substrate 031 forms a heat exchange space 033. In this way, the second substrate 032 has a simple structure and is easy to manufacture.

[0065] For example, the body part 327 and the connecting part 328 are integrally formed.

[0066] Please refer to FIG. 6, which is a structural schematic diagram of a battery cell provided by an embodiment of the present application. Accordingly, an embodiment of the present application provides a battery cell, which comprises a shell 002 and an electrode assembly. The shell 002 has a receiving cavity. The electrode assembly is arranged in the receiving cavity; wherein at least part of the shell 002 is a vapor chamber 003 disclosed by some embodiments of the present application.

[0067] It can be understood that the shell 002 comprises a housing 022 and a cover plate. At least part of the housing 022 can be the vapor chamber 003 disclosed by some embodiments of the present application, at least part of the cover plate can be the vapor chamber 003 disclosed by some embodiments of the present application, or at least part of the housing 022 and at least part of the cover plate can be the vapor chamber 003 disclosed by some embodiments of the present application. The periphery of the vapor chamber 003 is sealingly connected with the rest of the shell 002 to define the receiving cavity.

[0068] In addition, the battery cell further comprises an electrode terminal, a positive electrode tab, a negative electrode tab, a positive electrode current collector and a negative electrode current collector. The electrode terminal is arranged on the shell 002 and connected with the electrode assembly. Specifically, the electrode terminal comprises a positive electrode terminal and a negative electrode terminal. The electrode assembly can be formed by stacking a positive electrode sheet, a separator and a negative electrode sheet in sequence, or can be formed by stacking and winding a positive electrode sheet, a separator and a negative electrode sheet in sequence. The positive electrode sheet is connected with the positive electrode current collector through the positive electrode tab, and the positive electrode current collector is connected with the positive electrode terminal. The negative electrode sheet is connected with the negative electrode current collector through the negative electrode tab, and the negative electrode current collector is connected with the negative electrode terminal.

[0069] In the present embodiment, by adopting the vapor chamber 003 disclosed by some embodiments of the present application, on the one hand, the rigidity of the vapor chamber 003 can be improved based on the abutment of the first protrusion 323 and the first substrate 031, so as to improve the strength of the vapor chamber 003, and further improve the impact resistance of the battery cell; on the other hand, a part of the impact can be absorbed by the deformation of the second substrate 032 to the first substrate 031, so as to reduce the impact force suffered by the battery cell, thereby avoiding damage to the battery cell and improving the reliability of the battery cell.

[0070] In addition, by arranging at least part of the shell 002 as the vapor chamber 003 disclosed by some embodiments of the present application, the cavity wall of the receiving cavity required by the battery cell can be directly formed on the surface of the heat management plate, and thus the plate body originally configured to form the cavity wall of the receiving cavity can be omitted. In this way, the volume and weight of the battery provided with the vapor chamber 003 can be reduced, so as to improve the energy density of the battery.

[0071] In addition, by setting the side wall of the uniform temperature plate 003 as the cavity wall of the accommodating cavity, the heat inside the battery monomer can be directly absorbed by the uniform temperature plate 003. In this way, not only can the heat dissipation path of the battery monomer be shortened, but also the heat dissipation efficiency of the battery monomer can be improved, and the auxiliary material cost can be reduced without the need to configure glue, and many adverse factors caused by uneven gluing can be avoided.

[0072] Correspondingly, the embodiments of the present application provide a battery module, which comprises the battery monomer disclosed in some embodiments of the present application, and the battery monomer has a plurality of battery monomers in series or parallel connection. As shown in FIG. 7, FIG. 7 is a structural schematic diagram of the battery module provided by the embodiments of the present application; or the battery module comprises the battery monomer and the uniform temperature plate 003 disclosed in some embodiments of the present application, the battery monomer has a plurality of battery monomers arranged in sequence along a first direction, and the uniform temperature plate 003 has a plurality of uniform temperature plates 003 staggered with the plurality of battery monomers along the arrangement direction of the battery monomers, and the uniform temperature plate 003 is in contact with the adjacent battery monomer. As shown in FIG. 8, FIG. 8 is a structural schematic diagram of another battery module provided by the embodiments of the present application.

[0073] When the second substrate 032 is provided with the groove 321, two uniform temperature plates 003 can be arranged between the adjacent two battery monomers, and the second substrates 032 of the two uniform temperature plates 003 are arranged opposite to each other.

[0074] In the present embodiment, by adopting the uniform temperature plate 003 disclosed in some embodiments of the present application, on the one hand, the rigidity of the uniform temperature plate 003 can be improved based on the abutment of the first protrusion 323 and the first substrate 031, so as to improve the strength of the uniform temperature plate 003, and further improve the impact resistance of the battery module; on the other hand, the first substrate 031 can be deformed by the second substrate 032 to absorb a part of the impact, so as to reduce the impact force suffered by the battery monomer, thereby avoiding damage to the battery module, and improving the reliability of the battery module.

Claims

1. A uniform temperature plate (003), comprising: a first substrate (031); a second substrate (032) interconnected with the first substrate (031) to define a closed heat exchange cavity (033) in which a heat exchange medium is arranged; wherein a side of the second substrate (032) facing the first substrate (031) is provided with a plurality of first protrusions (322) protruding towards the first substrate (031), the first protrusions (322) being located in the heat exchange cavity (033) and being arranged spaced apart from the first substrate (031).

2. The uniform temperature plate (003) according to claim 1, wherein A spacing between the first protrusions (322) and the first substrate (031) is s, satisfying: 0 < s < 0.1 mm.

3. The uniform temperature plate (003) according to claim 1 or 2, wherein The first substrate (031) is configured to be in contact with a heat source.

4. The uniform temperature plate (003) according to claim 3, wherein A side of the second substrate (032) facing away from the first substrate (031) is provided with a plurality of grooves (321).

5. The uniform temperature plate (003) according to claim 4, wherein The grooves (321) correspond one-to-one to the first protrusions (322), and the grooves (321) extend into the corresponding first protrusions (322).

6. The uniform temperature plate (003) according to claim 4 or 5, wherein In a direction perpendicular to the first substrate (031), a depth of the grooves (321) is d, satisfying: 0.5 mm < d < 1 mm.

7. The uniform temperature plate (003) according to any one of claims 4-6, wherein A cross section of the grooves (321) is circular, and a diameter of an end of the grooves (321) facing away from the first substrate (031) is φ, satisfying: 0.5 mm < φ < 1 mm.

8. The uniform temperature plate (003) according to any one of claims 3-7, wherein, A thickness of a portion of the first substrate (031) configured to form the heat exchange cavity (033) is greater than a thickness of a portion of the second substrate (032) configured to form the heat exchange cavity (033).

9. The uniform temperature plate (003) according to any one of claims 1 - 8, wherein A side of the second substrate (032) facing the first substrate (031) is provided with a groove body (324), and the first substrate (031) closes an opening of the groove body (324) to form the heat exchange cavity (033).

10. The uniform temperature plate (003) according to claim 9, wherein The second substrate (032) comprises a body portion (327) and a connecting portion (328) connected to a periphery of the body portion (327), a portion of the body portion (327) close to the first substrate (031) is thinned to form the groove body (324), and the connecting portion (328) is configured to be connected with the first substrate (032) so that a space between the body portion (327) and the first substrate (031) forms the heat exchange cavity (033).

11. A battery cell, comprising: a housing (002) having a receiving cavity; an electrode assembly arranged in the receiving cavity; wherein at least part of the housing (002) is the uniform temperature plate (003) according to any one of claims 1-10.

12. A battery module, comprising a plurality of battery cells according to claim 11, the battery cells being connected in series or in parallel. Alternatively, the battery module comprises battery cells and the uniform temperature plate (003) according to any one of claims 1-10, the battery cells are multiple, the battery cells are arranged in sequence along a first direction, the uniform temperature plate (003) is multiple, and the uniform temperature plate (003) is staggered with the battery cells along the arrangement direction of the battery cells, and the uniform temperature plate (003) is in contact with the battery cells adjacent thereto.

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