Battery pack

Abstract

The utility model discloses a battery pack which comprises a plurality of battery cells, a liquid cooling plate and a partition plate, and the plurality of battery cells are arranged in sequence to form a battery pack. The liquid cooling plate is arranged at one end of the battery pack and used for cooling the battery pack. The partition plate is arranged between the adjacent battery cells and connected with the adjacent battery cells, a plurality of first air outlet channels penetrating through the partition plate are formed in the partition plate in the direction away from the liquid cooling plate, air inlet channels are formed between the partition plate and the liquid cooling plate at intervals, and the air inlet channels communicate with the first air outlet channels. According to the novel battery pack, the technical problem that the temperature distribution in the battery pack is not uniform is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery pack. BACKGROUND

[0002] At present, the heat dissipation of liquid-cooled battery pack mainly depends on the heat exchange between the bottom of the battery cell and the liquid-cooled plate, and the battery cells are separated by heat-conducting silica gel pads, heat-conducting gel and other materials. This design has the following problems: first, the temperature of the bottom of the battery cell is lower than that of the top, resulting in a large temperature difference inside the battery cell, affecting the consistency of the battery cell, and further affecting the energy efficiency and service life. Secondly, although the filler between the battery cells plays a buffering role, it cannot effectively dissipate heat, causing the temperature of the battery cells to accumulate in the case of thermal runaway, increasing the safety hazard. Therefore, the existing design has not effectively solved the problem of uneven temperature distribution inside the battery pack, resulting in low heat dissipation efficiency and affecting the long-term stability and safety of the battery. SUMMARY

[0003] One object of the utility model is to provide a battery pack, which aims to solve the technical problem of uneven temperature distribution inside the battery pack.

[0004] To achieve the above-mentioned purpose, the utility model provides a scheme: a battery pack, characterized by comprising: a plurality of battery cells, a liquid-cooled plate and a partition plate, the plurality of battery cells are arranged in sequence to form a battery pack. The liquid-cooled plate is arranged at one end of the battery pack and is used for dissipating heat of the battery pack. The partition plate is arranged between adjacent battery cells and is connected with the adjacent battery cells, the partition plate is provided with a plurality of first air outlet channels penetrating through itself in the direction away from the liquid-cooled plate, an air inlet channel is formed between the partition plate and the liquid-cooled plate, and the air inlet channel is communicated with the plurality of first air outlet channels.

[0005] Optionally, the inner diameter of the first air outlet channel is D1, the thickness of the partition plate is W1, and 0.3≤D1 / W1≤0.8.

[0006] Optionally, 0.5≤D1 / W1≤0.7.

[0007] Optionally, in the height direction of the battery cell, the height of the battery cell is H1, the height of the air inlet channel is H2, and 18.8≤H1 / H2≤22.5.

[0008] Optionally, 20.2≤H1 / H2≤21.1.

[0009] Optionally, in the width direction of the battery cell, the width of the battery cell is W2, the width of the air inlet channel is W3, and 68≤W2 / W3≤78.

[0010] Optionally, 71≤W2 / W3≤73.

[0011] Optionally, at least two partition plates are arranged between adjacent battery cells.

[0012] Optionally, the partition plate, liquid cooling plate, and two adjacent battery cells together form an air intake channel, which is connected to the inside of the battery pack. The first air outlet channel extends in a direction perpendicular to the liquid cooling plate, with one end penetrating the partition plate to form an air inlet, which is connected to the air intake channel, and the other end penetrating the partition plate to form an air outlet.

[0013] Optionally, the inner wall of the air outlet gradually narrows inward in the direction away from the air inlet channel, while the inner wall of the air inlet gradually expands outward in the direction away from the first air outlet channel.

[0014] Optionally, the first air outlet duct includes a first section and a second section. One end of the first section is connected to the air inlet duct, and the other end is connected to the second section. The second section is located at the end of the first section away from the air inlet duct. The second section and the first section are set at an angle. The end of the second section away from the first section passes through the partition plate to form an air outlet.

[0015] Optionally, the partition plate has a second air outlet channel, which is located on the side away from the first air outlet channel. The second section is inclined towards the side away from the second air outlet channel. The second air outlet channel includes a third section and a fourth section. The third section is arranged side by side with the first section. One end of the third section is connected to the air inlet channel, and the other end is connected to the fourth section. The end of the fourth section away from the third section passes through the partition plate to form an air outlet. The fourth section and the third section are arranged at an angle and are inclined away from the second section.

[0016] The beneficial effects of this utility model are as follows:

[0017] The battery pack includes multiple battery cells, a liquid cooling plate, and separators. The battery cells are arranged sequentially to form a battery pack. The liquid cooling plate is located at one end of the battery pack and is used for heat dissipation. The separators are located between adjacent battery cells and are connected to the adjacent battery cells. The separators have multiple first air outlet channels that run through them in the direction away from the liquid cooling plate. Air inlet channels are formed between the separators and the liquid cooling plate at intervals, and the air inlet channels are connected to the multiple first air outlet channels.

[0018] In practical applications, the heat generated by the battery cell is transferred to its surface through the separator, which in turn heats the gas in the first air outlet channel within the separator. The heated gas flows away from the liquid cooling plate (i.e., moves upward) along the first air outlet channel, creating a negative pressure effect within the channel. At this time, cooler gas located on the side closer to the liquid cooling plate is drawn in and enters the first air outlet channel through the air inlet channel, forming an airflow circulation. The liquid cooling plate removes heat from the battery cell from one end of the battery pack using the heat dissipation liquid. Simultaneously, the airflow in multiple first air outlet channels removes heat from the opposite sides of the battery cell. The heated airflow moves away from the liquid cooling plate, ensuring that the heat dissipation effect is not limited to a single location in the battery pack but is evenly distributed throughout the entire battery pack area, reducing the operating temperature of the battery cell and ensuring a more uniform temperature distribution within the battery pack. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in this embodiment of the utility model;

[0021] Figure 2 This is provided by the embodiment of the present utility model. Figure 1 A magnified view of a portion of region A in the middle;

[0022] Figure 3 This is a cross-sectional schematic diagram provided by an embodiment of the present invention to show the interior of the battery pack;

[0023] Figure 4 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 5 This is a partial cross-sectional schematic diagram provided by an embodiment of the present invention to show the air inlet and air outlet;

[0025] Figure 6 This is a structural schematic diagram provided by an embodiment of the present invention to illustrate the first air outlet channel and the second air outlet channel.

[0026] Explanation of icon numbers:

[0027] 20. Battery cell; 30. Liquid cooling plate; 40. Separator plate; 41. First air outlet channel; 411. First section; 412. Second section; 42. Second air outlet channel; 421. Third section; 422. Fourth section; 43. Air outlet; 50. Air inlet channel; 60. Air inlet. 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 shown, Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in this embodiment of the utility model. Figure 2 This is provided by the embodiment of the present utility model. Figure 1 A magnified view of a portion of region A in the middle. Figure 3 This is a cross-sectional schematic diagram provided by an embodiment of the present invention to show the interior of the battery pack. Figure 4 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.

[0030] This utility model provides a battery pack including multiple battery cells 20, a liquid cooling plate 30, and a separator plate 40. The multiple battery cells 20 are arranged sequentially to form a battery pack. The liquid cooling plate 30 is disposed at one end of the battery pack for heat dissipation. The separator plate 40 is disposed between adjacent battery cells 20 and connected to the adjacent battery cells 20. The separator plate 40 has multiple first air outlet channels 41 extending through itself in a direction away from the liquid cooling plate 30. An air inlet channel 50 is formed between the separator plate 40 and the liquid cooling plate 30 at intervals, and the air inlet channel 50 is connected to the multiple first air outlet channels 41.

[0031] In practical applications, the heat generated by the battery cell 20 is transferred to its surface through the separator 40, thereby heating the gas in the first air outlet channel 41 within the separator 40. The heated gas flows along the first air outlet channel 41 away from the liquid cooling plate 30 (i.e., moves upward), thus creating a negative pressure effect within the channel. At this time, the cooler gas located on the side closer to the liquid cooling plate 30 is drawn in and enters the first air outlet channel 41 through the air inlet channel 50, forming an airflow circulation. The liquid cooling plate 30 removes the heat from the battery cell 20 from one end of the battery pack through the heat dissipation liquid. Simultaneously, the airflow in the multiple first air outlet channels 41 removes the heat from the opposite side of the battery cell 20. The heated airflow moves away from the liquid cooling plate 30, ensuring that the heat dissipation effect is not limited to a single location in the battery pack but is evenly distributed throughout the entire battery pack area, reducing the operating temperature of the battery cell 20 and ensuring a more uniform temperature distribution within the battery pack. In addition, the heat from the cell 20 is carried away by the gas in the first air outlet channel 41 after being transferred to the separator 40, which prevents heat transfer between adjacent cells 20, further improves heat dissipation efficiency, effectively reduces the risk of local overheating, and enhances the overall safety and reliability of the battery pack.

[0032] In this embodiment, the liquid cooling plate 30 is disposed at the bottom of the battery pack, the air inlet channel 50 is disposed parallel to the extension direction of the liquid cooling plate 30, and the first air outlet channel 41 is disposed perpendicular to the extension direction of the liquid cooling plate 30.

[0033] In one embodiment, see Figure 4 The inner diameter of the first air outlet duct 41 is D1, and the thickness of the partition plate 40 is W1, where 0.3≤D1 / W1≤0.8.

[0034] In practical applications, when the ratio of D1 / W1 is within the range of 0.3 ≤ D1 / W1 ≤ 0.8, the airflow can pass through the first air outlet channel 41 at a suitable speed. This avoids both excessive airflow resistance due to an insufficiently small channel and excessively high airflow velocity due to an excessively large channel, which would prevent effective heat removal. By optimizing the ratio of the inner diameter of the first air outlet channel 41 to the thickness of the partition plate 40, more efficient heat transfer can be achieved, ensuring that the airflow can fully absorb the heat from the battery cell 20 and the partition plate 40 within the channel, thereby improving the overall heat dissipation effect.

[0035] Further, see Figure 4 , 0.5≤D1 / W1≤0.7.

[0036] In one embodiment, see Figure 3 and Figure 4 In the height direction of cell 20, the height of cell 20 is H1, the height of air inlet channel 50 is H2, and 18.8≤H1 / H2≤22.5.

[0037] In practical applications, when the ratio of H2 to H1 is within the range of 18.8 ≤ H1 / H2 ≤ 22.5, it ensures that the airflow through the air intake channel 50 can fully penetrate into the battery pack. The advantage of this design is that after the airflow enters the battery pack through the air intake channel 50, it can be evenly distributed among the individual cells 20, effectively carrying away the heat generated by the cells 20 and avoiding excessive temperature differences. Furthermore, the appropriate height ratio of the air intake channel 50 also ensures that the airflow can maximize the utilization of the space within the air intake channel 50, thereby improving overall heat dissipation efficiency.

[0038] Optionally, see Figure 3 and Figure 4 , 20.2≤H1 / H2≤21.1.

[0039] In one embodiment, reference is made to Figure 4 In the width direction of the battery cell 20, the width of the battery cell 20 is W2, the width of the air inlet channel 50 is W3, and 68≤W2 / W3≤78.

[0040] In practical applications, when the ratio of the width of the battery cell 20 to the width of the air inlet channel 50 is within the range of 68 ≤ W2 / W3 ≤ 78, the air inlet channel 50 can provide sufficient space to allow airflow to flow smoothly through the area between the battery cells 20, ensuring that heat is effectively transferred from the surface of the battery cell 20 to the airflow. Simultaneously, an appropriate width of the air inlet channel 50 can maximize the airflow rate, thereby enhancing the cooling effect of the airflow on the battery cell 20. Through this design, the air inlet channel 50 can better meet the heat dissipation requirements, ensuring a uniform temperature distribution throughout the battery pack.

[0041] Furthermore, referring to Figure 4 , 71≤W2 / W3≤73.

[0042] In one embodiment, reference is made to Figure 4 At least two partition plates 40 are provided between adjacent cells 20.

[0043] In practical applications, by setting at least two separators 40 between adjacent cells 20, the airflow and heat dissipation within the battery pack are further improved. Specifically, the arrangement of multiple separators 40 effectively creates more airflow paths within the battery pack, promoting a more even distribution of airflow between each cell 20. This design better guides heat from the surface of the cell 20 to the airflow, ensuring efficient heat dissipation. Furthermore, by setting at least two separators 40, heat conduction between adjacent cells 20 is effectively isolated, reducing mutual heat transfer between cells 20 and improving the localized heat dissipation effect.

[0044] In one embodiment, reference is made to Figure 3 and Figure 4The partition plate 40, the liquid cooling plate 30, and the two adjacent battery cells 20 together form an air intake channel 50, which is connected to the inside of the battery pack. The first air outlet channel 41 extends in a direction perpendicular to the liquid cooling plate 30, and one end passes through the partition plate 40 to form an air inlet 60, which is connected to the air intake channel 50. The other end passes through the partition plate 40 to form an air outlet 43.

[0045] In practical applications, the first air outlet channel 41 extends perpendicular to the liquid cooling plate 30, with one end connected to the air inlet 60 and the other end contacting the outside air through the air outlet 43, thus guiding airflow and removing heat. Through this structural design, the air inlet channel 50 and the first air outlet channel 41 work together to effectively avoid dead zones in airflow, allowing airflow to flow evenly across all areas of the battery pack and ensuring improved heat dissipation performance of the entire battery pack.

[0046] Furthermore, referring to Figure 5 The inner wall of the air outlet 43 gradually narrows inward in the direction away from the air inlet channel 50, while the inner wall of the air inlet 60 gradually expands outward in the direction away from the first air outlet channel 41.

[0047] In practical applications, the gradually inward-curving inner wall of the air outlet 43 helps guide the airflow appropriately as it passes through the outlet 43, allowing it to smoothly exit from the first air outlet channel 41. This gradually inward design allows the airflow velocity to gradually increase, effectively reducing backflow and eddies, lowering flow resistance, and thus improving airflow discharge efficiency. The gradually outward-expanding inner wall of the air inlet 60 helps the airflow achieve a smoother transition when entering the air inlet channel 50, reducing drastic airflow changes or eddies. This outward-expanding structure effectively guides cold air into the battery pack and makes the airflow flow more evenly into the air inlet channel 50.

[0048] In one embodiment, reference is made to Figure 6 The first air outlet duct 41 includes a first section 411 and a second section 412. One end of the first section 411 is connected to the air inlet duct 50, and the other end is connected to the second section 412. The second section 412 is located at the end of the first section 411 away from the air inlet duct 50. The second section 412 and the first section 411 are set at an angle. The end of the second section 412 away from the first section 411 passes through the partition plate 40 to form an air outlet 43.

[0049] In practical applications, if the first air outlet duct 41 is set completely perpendicular to the liquid cooling plate 30, the airflow exiting from the air outlet 43 may directly impact the surface of the battery pack, causing the airflow to stagnate above the battery pack, affecting heat dissipation efficiency and potentially causing localized overheating. To solve this problem, in this embodiment, the second segment 412 is set at an angle to the first segment 411, allowing the airflow to flow at an angle towards the height of the battery pack after exiting from the first air outlet duct 41. This design adjusts the airflow path, preventing the airflow from directly impacting the surface of the battery pack, thereby reducing stagnation, enhancing smooth airflow, effectively improving the heat dissipation capacity of the battery pack, and ensuring that the battery operates in a balanced temperature environment.

[0050] Furthermore, referring to Figure 6 The partition plate 40 has a second air outlet duct 42, which is located on the side away from the first air outlet duct 41. The second section 412 is inclined towards the side away from the second air outlet duct 42. The second air outlet duct 42 includes a third section 421 and a fourth section 422. The third section 421 and the first section 411 are arranged side by side. One end of the third section 421 is connected to the air inlet duct 50, and the other end is connected to the fourth section 422. The end of the fourth section 422 away from the third section 421 passes through the partition plate 40 to form an air outlet 43. The fourth section 422 and the third section 421 are arranged at an angle and are inclined away from the second section 412.

[0051] In practical applications, when the airflow enters the fourth section 422 after passing through the third section 421, the inclined design of the fourth section 422 guides the airflow away from the second section 412, further reducing airflow resistance and optimizing the airflow path. The airflow flows more smoothly and is more evenly distributed inside the battery pack, carrying away the heat generated by the cell 20, thereby improving the heat dissipation efficiency of the battery pack.

[0052] This design significantly improves the heat dissipation of the battery pack, resulting in a more uniform temperature distribution and preventing localized overheating, thereby enhancing battery safety and efficiency. Furthermore, the optimized airflow path reduces airflow resistance, further improving heat dissipation efficiency and energy efficiency, ensuring the battery maintains a stable temperature environment during operation.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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 battery cells are arranged sequentially to form a battery pack; A liquid cooling plate is disposed at one end of the battery pack and is used to dissipate heat from the battery pack. A separator plate is disposed between adjacent battery cells and connected to the adjacent battery cells. The separator plate has multiple first air outlet channels extending through itself in a direction away from the liquid cooling plate. An air inlet channel is formed between the separator plate and the liquid cooling plate at intervals. The air inlet channel is connected to the multiple first air outlet channels.

2. The battery pack according to claim 1, characterized in that, The inner diameter of the first air outlet duct is D1, and the thickness of the partition plate is W1, where 0.3 ≤ D1 / W1 ≤ 0.

8.

3. The battery pack according to claim 2, characterized in that, 0.5≤D1 / W1≤0.

7.

4. The battery pack according to any one of claims 1 to 3, characterized in that, In the height direction of the battery cell, the height of the battery cell is H1, the height of the air inlet channel is H2, and 18.8≤H1 / H2≤22.

5.

5. The battery pack according to claim 4, characterized in that, 20.2≤H1 / H2≤21.

1.

6. The battery pack according to any one of claims 1 to 3, characterized in that, In the width direction of the battery cell, the width of the battery cell is W2, the width of the air inlet channel is W3, and 68≤W2 / W3≤78.

7. The battery pack according to claim 6, characterized in that, 71≤W2 / W3≤73.

8. The battery pack according to claim 1, characterized in that, At least two partition plates are provided between adjacent battery cells.

9. The battery pack according to claim 1, characterized in that, The partition plate, the liquid cooling plate, and two adjacent battery cells together form the air intake channel, which is connected to the inside of the battery pack. The first air outlet channel extends in a direction perpendicular to the liquid cooling plate, with one end penetrating the partition plate to form an air inlet, which is connected to the air intake channel, and the other end penetrating the partition plate to form an air outlet.

10. The battery pack according to claim 9, characterized in that, The inner wall of the air outlet gradually narrows inward in a direction away from the air inlet channel, while the inner wall of the air inlet gradually expands outward in a direction away from the first air outlet channel.

11. The battery pack according to claim 1, characterized in that, The first air outlet channel includes a first section and a second section. One end of the first section is connected to the air inlet channel, and the other end is connected to the second section. The second section is located at the end of the first section away from the air inlet channel. The second section and the first section are arranged at an angle. The end of the second section away from the first section passes through the partition plate to form an air outlet.

12. The battery pack according to claim 11, characterized in that, The partition plate has a second air outlet channel, which is located on the side away from the first air outlet channel, and the second section is inclined towards the side away from the second air outlet channel. The second air outlet channel includes a third section and a fourth section. The third section and the first section are arranged side by side. One end of the third section is connected to the air inlet channel, and the other end is connected to the fourth section. The end of the fourth section away from the third section passes through the partition plate to form an air outlet. The fourth section and the third section are arranged at an angle and are inclined away from the second section.

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