Battery pack

Abstract

The utility model discloses a battery pack, which comprises a heat exchange plate and a plurality of single batteries, the plurality of single batteries are arranged along the thickness direction, the area of each single battery provided with an electrode is an electrode area, and the area of each single battery provided with an anti-explosion valve is an anti-explosion area. The heat exchange plate comprises a first heat exchange part and a second heat exchange part, the first heat exchange part is arranged at the two opposite ends of the second heat exchange part, a pole hole is formed in the first heat exchange part in the thickness direction of the first heat exchange part, a first flow channel is formed in the first heat exchange part in the extending direction of the first heat exchange part, and an anti-explosion hole is formed in the second heat exchange part in the thickness direction of the second heat exchange part. The second heat exchange part is provided with a second flow channel along the extending direction, the first heat exchange part is arranged on the single battery corresponding to the electrode area, and the second heat exchange part is arranged on the single battery corresponding to the anti-explosion area. According to the battery pack, the heat dissipation efficiency of the battery pack is further improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] With the widespread application of electric vehicles and energy storage devices, battery pack heat dissipation has gradually become a key factor affecting battery performance and safety. To ensure that batteries maintain a suitable temperature during high-power operation, the design of the battery pack's heat dissipation system has become one of the core aspects of battery technology development. Currently, most square batteries with the same-side output terminals on the market use bottom liquid cooling and large-area liquid cooling methods for heat dissipation to effectively reduce the battery's operating temperature. However, as battery power continues to increase, the battery heat dissipation problem becomes increasingly severe, and traditional heat dissipation methods are no longer sufficient to meet the growing heat dissipation demands. Therefore, it is urgent to optimize existing heat dissipation solutions to adapt to the heat dissipation requirements of higher-power batteries and ensure the stability and safety of the battery pack. Utility Model Content

[0003] One objective of this invention is to provide a battery pack that addresses the technical problem of further improving the heat dissipation efficiency of the battery pack.

[0004] To achieve the above objectives, this utility model provides a solution: a battery pack, characterized in that it includes: a heat exchange plate and multiple individual batteries, the multiple individual batteries being arranged along their thickness direction, the area of ​​each individual battery having electrodes being an electrode area, and the area of ​​each individual battery having an explosion-proof valve being an explosion-proof area. The heat exchange plate includes a first heat exchange section and a second heat exchange section, the first heat exchange section being disposed at opposite ends of the second heat exchange section, the first heat exchange section having electrode post holes along its thickness direction and a first flow channel along its extension direction, the second heat exchange section having explosion-proof holes along its thickness direction and a second flow channel along its extension direction, the first heat exchange section being disposed corresponding to the electrode area, and the second heat exchange section being disposed corresponding to the explosion-proof area.

[0005] Optionally, the thermal conductivity of the first heat exchange section is greater than that of the second heat exchange section.

[0006] Optionally, the heat exchange plate also includes a connecting portion, the first heat exchange portion being connected to the second heat exchange portion via the connecting portion, and the connecting portion being bent toward the side away from the individual cell.

[0007] Optionally, the inner diameter of the first flow channel is D1, and the inner diameter of the second flow channel is D2, where D1 ≥ D2.

[0008] Optionally, the thickness of the first heat exchange section is L1, and the thickness of the second heat exchange section is L2, where L1 ≥ L2.

[0009] Optionally, in the thickness direction of the heat exchange plate, the projected area of ​​the first heat exchange section is S1, and the projected area of ​​the second heat exchange section is S2, where 1 / 3 ≤ S1 / S2 ≤ 5 / 4.

[0010] Optionally, the second flow channel includes multiple first sections and multiple second sections. The multiple first sections are spaced apart along the extension direction of the first heat exchange section, and the two ends of the second section are respectively connected to the adjacent first section. The second section is set at an angle relative to the first section.

[0011] Optionally, the first and second segments are set perpendicularly; or, the second segment is arc-shaped and tangent to the first segment.

[0012] Optionally, the heat exchange plate includes a positive electrode marking and a negative electrode marking, which are respectively disposed on the first heat exchange section located at opposite ends of the second heat exchange section.

[0013] Optionally, the battery includes an adhesive layer disposed between the heat exchange plate and the individual cell.

[0014] Optionally, the adhesive layer may have air ducts along its extension direction.

[0015] The beneficial effects of this utility model are as follows:

[0016] The battery pack includes multiple individual cells and a heat exchange plate. The individual cells are arranged along their thickness direction. The area of ​​each individual cell with electrodes is the electrode area, and the area of ​​each individual cell with an explosion-proof valve is the explosion-proof area. The heat exchange plate includes a first heat exchange section and a second heat exchange section. The first heat exchange section is located at opposite ends of the second heat exchange section. The first heat exchange section has electrode post holes along its thickness direction and a first flow channel along its extension direction. The second heat exchange section has explosion-proof holes along its thickness direction and a second flow channel along its extension direction. The first heat exchange section is positioned on the individual cell corresponding to the electrode area, and the second heat exchange section is positioned on the individual cell corresponding to the explosion-proof area.

[0017] The cooling medium flows through the first channel in the first heat exchange section to concentrate heat dissipation on the electrode area, while simultaneously flowing in the second channel to assist in heat dissipation in the explosion-proof area. Because the thermal conductivity of the first heat exchange section is higher than that of the second heat exchange section, the battery pack achieves a more uniform temperature distribution during heat dissipation, reducing the internal temperature gradient and improving the overall stability of the battery. Furthermore, the heat exchange plate utilizes the space above the battery pack's interior, effectively improving the heat dissipation efficiency of the battery pack, thereby enhancing the battery's safety and reliability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the heat exchange plate provided in this embodiment of the utility model;

[0020] Figure 2 This is a front view of a heat exchange plate used to display positive and negative electrode markings, provided in an embodiment of this utility model.

[0021] Figure 3 This is a structural schematic diagram of the heat exchange plate end face provided in an embodiment of the present invention;

[0022] Figure 4 This is provided by the embodiment of the present utility model. Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0023] Figure 5 This is provided by the embodiment of the present utility model. Figure 3 A magnified view of a portion of region B in the middle;

[0024] Figure 6 This is a partial structural schematic diagram of the flow channel provided in an embodiment of the present invention;

[0025] Figure 7 This is a partial structural schematic diagram provided by an embodiment of the present invention to illustrate the adhesive layer and the air duct.

[0026] Explanation of icon numbers:

[0027] 20. Heat exchange plate; 21. First heat exchange section; 211. First flow channel; 212. Electrode post hole; 22. Second heat exchange section; 221. Second flow channel; 2211. First section; 2212. Second section; 222. Explosion-proof hole; 23. Connecting part; 24. Positive electrode marking; 25. Negative electrode marking; 30. Single cell; 40. Adhesive layer; 41. Air duct. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1 to 4 as well as Figure 7 As shown, Figure 1 This is a schematic diagram of the overall structure of the heat exchange plate 20 provided in this embodiment of the utility model. Figure 2 This is a front view of the heat exchange plate 20 showing the positive electrode marking 24 and the negative electrode marking 25, provided by an embodiment of this utility model. Figure 3 This is a structural schematic diagram provided by an embodiment of the present invention to show the end face of the heat exchange plate 20. Figure 4 This is provided by the embodiment of the present utility model. Figure 3 Schematic diagram of the cross-sectional structure at point AA. Figure 7 This is a partial structural schematic diagram provided by an embodiment of the present invention to illustrate the adhesive layer 40 and the air duct 41.

[0030] This utility model provides a battery pack, including: a plurality of individual batteries 30 and a heat exchange plate 20. The plurality of individual batteries 30 are arranged along their thickness direction. The area of ​​the individual battery 30 with electrodes is the electrode area, and the area of ​​the individual battery 30 with an explosion-proof valve is the explosion-proof area. The heat exchange plate 20 includes a first heat exchange part 21 and a second heat exchange part 22. The first heat exchange part 21 is disposed at opposite ends of the second heat exchange part 22. The first heat exchange part 21 has electrode post holes 212 along its thickness direction and a first flow channel 211 along its extension direction. The second heat exchange part 22 has explosion-proof holes 222 along its thickness direction and a second flow channel 221 along its extension direction. The first heat exchange part 21 is disposed corresponding to the electrode area, and the second heat exchange part 22 is disposed corresponding to the explosion-proof area.

[0031] In practical applications, the heat dissipation design of the battery pack optimizes heat dissipation by distinguishing between the electrode area and the explosion-proof area. Specifically, the electrode area includes the positive and negative electrodes of the individual battery 30, and this area generates more heat than the explosion-proof area. To effectively distribute heat evenly, heat exchange plates 20 are attached to the top of multiple individual batteries 30. The first heat exchange section 21 dissipates heat from the high-heat electrode area, and the terminal post holes 212 on it are used to accommodate the terminals of the individual battery 30. The second heat exchange section 22 is for the explosion-proof area and has explosion-proof holes 222 to accommodate the explosion-proof valve of the individual battery 30.

[0032] The cooling medium flows through the first flow channel 211 in the first heat exchange section 21 to concentrate heat dissipation on the electrode area. Simultaneously, the cooling medium flows in the second flow channel 221 to assist in heat dissipation in the explosion-proof area. Because the thermal conductivity of the first heat exchange section 21 is higher than that of the second heat exchange section 22, the battery pack achieves a more uniform temperature distribution during heat dissipation, reducing the internal temperature gradient of the battery and improving the overall stability of the battery. Furthermore, the heat exchange plate 20 utilizes the space above the battery pack's interior, effectively improving the heat dissipation efficiency of the battery pack, thereby enhancing the safety and reliability of the battery.

[0033] In this embodiment, the cooling medium can be coolant, insulating cooling oil, fluorinated liquid, air, nitrogen or helium, etc.

[0034] In one embodiment, the thermal conductivity of the first heat exchange section 21 is greater than that of the second heat exchange section 22.

[0035] In practical applications, the heat exchange plate 20 can be made of copper, aluminum alloy, metal matrix composite material, graphite material, aluminum-silicon alloy, etc. The above materials are arranged in descending order of thermal conductivity as copper, aluminum alloy, metal matrix composite material, graphite material, and aluminum-silicon alloy. The thermal conductivity of the first heat exchange part 21 is greater than that of the second heat exchange part 22. That is, when the material of the first heat exchange part 21 is copper, the material of the second heat exchange part 22 can be a material with a thermal conductivity less than that of copper.

[0036] In one embodiment, see Figure 2 , Figure 3 and Figure 5 The heat exchange plate 20 also includes a connecting part 23. The first heat exchange part 21 is connected to the second heat exchange part 22 through the connecting part 23. The connecting part 23 is bent toward the side away from the single cell 30.

[0037] In practical applications, the battery pack exerts pressure on the heat exchange plate 20 due to thermal expansion during charge-discharge cycles. The connecting portion 23 bends away from the individual battery cells 30, creating a buffer and deformation space. When the battery expands, the connecting portion 23 can bend to accommodate the expansion force, thereby reducing the concentrated pressure acting directly on the heat exchange plate 20. The heat exchange plate 20 can maintain a stable structure after withstanding the pressure during expansion and return to its original position after the expansion is relieved. This bending structure increases the compressive strength of the heat exchange plate 20 while ensuring continuous close contact between the heat exchange plate 20 and the battery pack, so that the heat dissipation performance will not decrease due to battery expansion, further enhancing the heat dissipation efficiency and overall stability of the battery pack.

[0038] In one embodiment, see Figure 5 The inner diameter of the first flow channel 211 is D1, and the inner diameter of the second flow channel 221 is D2, where D1 ≥ D2.

[0039] In practical applications, the inner diameter D1 of the first flow channel 211 is greater than or equal to the inner diameter D2 of the second flow channel 221, enabling differentiated heat dissipation of the cooling medium within the battery pack. Since the electrode area typically generates a large amount of heat, the larger inner diameter of the first flow channel 211 facilitates the rapid flow of the cooling medium and its absorption of the heat generated in the electrode area, thereby improving the heat dissipation efficiency in that region. Conversely, the smaller inner diameter of the second flow channel 221 helps regulate the flow rate of the cooling medium in the explosion-proof zone, resulting in more uniform cooling and preventing heat concentration in the electrode area and its diffusion into the explosion-proof zone. This design of the flow channel dimensions ensures a more uniform temperature distribution across different areas of the battery pack, significantly improving heat dissipation and the overall safety of the battery pack.

[0040] In this embodiment, 0.5mm≤D1≤3mm, 0.5mm≤D2≤3mm.

[0041] Further, see Figure 5 The thickness of the first heat exchange section 21 is L1, and the thickness of the second heat exchange section 22 is L2, where L1 ≥ L2.

[0042] In practical applications, the thicker first heat exchange section 21 provides higher structural strength and stability, effectively enhancing the durability of the battery pack in the electrode area. This design compensates for the potential strength reduction caused by the large inner diameter of the first flow channel 211, thereby improving the stability of the heat exchange plate 20 when it expands under heat in the electrode area, ensuring heat dissipation while maintaining the long-term reliability of the battery pack.

[0043] In one embodiment, see Figure 2 In the thickness direction of the heat exchange plate 20, the projected area of ​​the first heat exchange part 21 is S1, and the projected area of ​​the second heat exchange part 22 is S2, 1 / 3≤S1 / S2≤5 / 4.

[0044] In practical applications, a reasonable area ratio design ensures that the heat exchange plate 20 can effectively transfer heat in different areas of the battery pack. The area of ​​the first heat exchange section 21 is appropriately increased to improve the heat dissipation capacity of the electrode area, while the area design of the second heat exchange section 22 is optimized for the heat dissipation requirements of the explosion-proof area, ensuring a balanced overall heat dissipation effect. By adjusting the area ratio, the space of the heat exchange plate 20 can be fully utilized while avoiding excessive heat dissipation concentrated in a certain area, thereby improving the overall heat dissipation efficiency and safety of the battery pack.

[0045] In this embodiment, 100mm²≤S1≤1500mm², 300mm²≤S2≤1200mm².

[0046] In one embodiment, reference is made to Figure 6The second flow channel 221 includes a plurality of first segments 2211 and a plurality of second segments 2212. The plurality of first segments 2211 are spaced apart along the extension direction of the first heat exchange section 21. The two ends of the second segment 2212 are respectively connected to the adjacent first segment 2211. The second segment 2212 is set at an angle relative to the first segment 2211.

[0047] In practical applications, by dividing the second flow channel 221 into multiple first segments 2211 and multiple second segments 2212, and arranging the multiple first segments 2211 at intervals along the extension direction of the first heat exchange section 21, the flow path and flow time of the fluid can be effectively increased, thereby increasing the contact time and area between the cooling medium and the heat exchange plate 20, and enhancing heat transfer efficiency. Simultaneously, the angle between the second segment 2212 and the first segment 2211 further optimizes the flow direction of the fluid, allowing the cooling medium to better bypass and adapt to the structure of the heat exchange plate 20 when flowing through the second segment 2212, avoiding direct parallel flow of the cooling medium to the surface of the heat exchange plate 20, which would lead to low heat exchange efficiency. This design not only improves the heat dissipation performance of the flow channel but also optimizes the flow path of the cooling medium, thereby enhancing the overall heat dissipation effect and the stability of the battery pack.

[0048] Furthermore, referring to Figure 6 The first segment 2211 and the second segment 2212 are set perpendicularly; or the second segment 2212 is arc-shaped and tangent to the first segment 2211.

[0049] In practical applications, the vertical arrangement diversifies the fluid flow path, helping to improve heat exchange efficiency. If the second segment 2212 adopts an arc-shaped design and is tangent to the first segment 2211, the flow of the cooling medium can be further smoothed, making it flow more smoothly through the flow channel, reducing flow resistance, and improving the contact effect between the fluid and the heat exchange plate 20, thereby enhancing heat transfer performance and improving the overall heat dissipation effect. These designs not only optimize the flow path of the cooling medium but also make the cooling process more efficient, helping to maintain the temperature stability of the battery pack during operation.

[0050] In one embodiment, reference is made to Figure 2 The heat exchange plate 20 includes a positive electrode marking 24 and a negative electrode marking 25, which are respectively disposed on the first heat exchange section 21 located at opposite ends of the second heat exchange section 22.

[0051] In practical applications, the positive and negative terminal markings 24 and 25 provide clear directional guidance during the installation and assembly of the battery pack, ensuring that the heat exchange plate 20 is correctly aligned during installation and preventing reduced or uneven heat dissipation due to incorrect installation. By marking the positive and negative terminals, operators can be effectively guided to quickly determine the correct installation position of the heat exchange plate 20 during assembly, thereby improving assembly efficiency and reducing the risk of errors during installation. Furthermore, the markings also help to quickly identify the positive and negative terminal areas of the battery pack during maintenance and inspection, aiding in subsequent troubleshooting and maintenance operations.

[0052] In one embodiment, reference is made to Figure 7 The battery includes an adhesive layer 40, which is disposed between the heat exchange plate 20 and the individual cell 30.

[0053] In practical applications, an adhesive layer 40 is provided between the heat exchange plate 20 and the individual battery 30 to enhance the tight contact and heat conduction between the heat exchange plate 20 and the battery. The adhesive layer 40 ensures that the contact between the heat exchange plate 20 and the individual battery 30 is not disturbed by external factors, thereby maximizing heat conduction efficiency. The adhesive layer 40 can also effectively mitigate the gap changes between the battery and the heat exchange plate 20 caused by battery expansion or stress, further ensuring stable thermal contact between the heat exchange plate and the battery, and improving the safety and stability of the battery.

[0054] In this embodiment, the adhesive layer 40 can be made of thermally conductive adhesive, silicone, thermally conductive grease, or polyurethane adhesive, etc.

[0055] Furthermore, referring to Figure 7 The adhesive layer 40 has an air duct 41 along its extension direction.

[0056] In practical applications, the adhesive layer 40 has air ducts 41 along its extension direction. By guiding air circulation, it promotes the flow of cooling medium in the battery pack, so that heat can be more effectively transferred to the outside, thereby avoiding overheating problems caused by heat accumulation.

[0057] In this embodiment, there are multiple air ducts 41, which are spaced apart, and the cross-section of each air duct 41 is circular. In other embodiments, there is only one air duct 41, which spans across the single battery cell 30. The cross-section of the air duct 41 may also be elliptical or other shapes.

[0058] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0059] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0060] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0061] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A battery pack, characterized in that, include: Multiple individual cells are arranged along their thickness direction. The area where the individual cells have electrodes is called the electrode area, and the area where the individual cells have explosion-proof valves is called the explosion-proof area. A heat exchange plate includes a first heat exchange section and a second heat exchange section. The first heat exchange section is disposed at opposite ends of the second heat exchange section. The first heat exchange section has electrode holes along its thickness direction and a first flow channel along its extension direction. The second heat exchange section has explosion-proof holes along its thickness direction and a second flow channel along its extension direction. The first heat exchange section is disposed corresponding to the electrode area, and the second heat exchange section is disposed corresponding to the explosion-proof area.

2. The battery pack according to claim 1, characterized in that, The thermal conductivity of the first heat exchange section is greater than that of the second heat exchange section.

3. The battery pack according to claim 1, characterized in that, The heat exchange plate also includes a connecting portion, through which the first heat exchange portion is connected to the second heat exchange portion, and the connecting portion is bent toward the side away from the single cell.

4. The battery pack according to claim 1, characterized in that, The inner diameter of the first flow channel is D1, and the inner diameter of the second flow channel is D2, where D1 ≥ D2.

5. The battery pack according to claim 4, characterized in that, The thickness of the first heat exchange section is L1, and the thickness of the second heat exchange section is L2, where L1 ≥ L2.

6. The battery pack according to claim 1, characterized in that, In the thickness direction of the heat exchange plate, the projected area of ​​the first heat exchange part is S1, and the projected area of ​​the second heat exchange part is S2, 1 / 3≤S1 / S2≤5 / 4.

7. The battery pack according to claim 1, characterized in that, The second flow channel includes a plurality of first sections and a plurality of second sections. The plurality of first sections are spaced apart along the extension direction of the first heat exchange section. The two ends of the second sections are respectively connected to the adjacent first sections. The second sections are arranged at an angle relative to the first sections.

8. The battery pack according to claim 7, characterized in that, The first segment and the second segment are arranged perpendicularly; or, the second segment is arc-shaped and tangent to the first segment.

9. The battery pack according to claim 1, characterized in that, The heat exchange plate includes a positive electrode marking and a negative electrode marking, which are respectively disposed on the first heat exchange section located at opposite ends of the second heat exchange section.

10. The battery pack according to any one of claims 1 to 9, characterized in that, The battery includes an adhesive layer disposed between the heat exchange plate and the individual battery cell.

11. The battery pack according to claim 10, characterized in that, The adhesive layer has air ducts along its extension direction.

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