Battery pack and battery system

Abstract

The invention relates to a battery pack and a battery system, and the battery pack comprises a box body which is internally provided with a containing space, the containing space is used for containing immersion liquid, the box body comprises a first end part and a second end part which are oppositely arranged, the first end part is provided with a first liquid inlet, and the second end part is provided with a first liquid outlet; the battery is arranged in the accommodating space; the liquid cooling plate is adjacent to the box body, the interior of the liquid cooling plate is used for containing cooling liquid, the liquid cooling plate comprises a third end part and a fourth end part which are oppositely arranged, the third end part is provided with a second liquid outlet, and the fourth end part is provided with a second liquid inlet; wherein the first end part is adjacent to the third end part, and the second end part is adjacent to the fourth end part. According to the battery pack, the heat dissipation effect can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and a battery system. Background Art

[0002] In lithium battery systems, thermal management technology is a key factor in ensuring battery performance and safety. Currently, battery packs mainly use two thermal management solutions: indirect liquid cooling and immersion cooling. Indirect liquid cooling has limited heat dissipation effect due to the limited contact area between the cooling medium and the battery cell, making it difficult to meet high-power charging and discharging requirements. Although immersion cooling can increase the contact area between the battery and the cooling medium and improve the temperature uniformity, the liquid does not flow in immersion cooling, and the heat cannot be effectively removed, which also affects the heat dissipation effect. Summary of the invention

[0003] The embodiments of the present application provide a battery pack and a battery system, which can improve the heat dissipation effect of the battery pack.

[0004] In a first aspect, the present application provides a battery pack, comprising:

[0005] A box body, wherein a containing space is provided therein, the containing space is used to contain the immersion liquid, the box body comprises a first end and a second end which are arranged opposite to each other, the first end is provided with a first liquid inlet, and the second end is provided with a first liquid outlet;

[0006] A battery is disposed in the accommodation space;

[0007] a liquid cooling plate, adjacent to the box body, the liquid cooling plate being used to contain cooling liquid, the liquid cooling plate comprising a third end and a fourth end oppositely disposed, the third end being provided with a second liquid outlet, and the fourth end being provided with a second liquid inlet;

[0008] The first end portion is adjacent to the third end portion, and the second end portion is adjacent to the fourth end portion.

[0009] In one embodiment, a distance between the first liquid inlet and the second liquid outlet is L1, 1 cm ≤ L1 ≤ 10 cm.

[0010] In one embodiment, the distance between the first liquid outlet and a side of the box away from the liquid cooling plate is L2, and 15 cm ≤ L2 ≤ 22 cm.

[0011] In one embodiment, the distance between the second liquid inlet and the liquid cooling plate close to the box body is L3, and the distance between the second liquid outlet and the liquid cooling plate close to the box body is L4, wherein L4≤L3, 2cm≤L4≤6cm.

[0012] In one embodiment, the height of the box is H1, the height of the liquid cooling plate is H2, and 2≤H1 / H2≤5.

[0013] In one embodiment, the length of the box is D1, the length of the liquid cooling plate is D2, and 15 cm ≤ D1 - D2 ≤ 22 cm.

[0014] In one embodiment, along the length direction of the box body, the first end portion includes a first end plate, the second end portion includes a second end plate, the first end plate and the second end plate are arranged opposite to each other, the first liquid inlet is arranged on the first end plate, and the first liquid outlet is arranged on the second end plate;

[0015] Along the length direction of the liquid cooling plate, the third end portion includes a third end plate, the fourth end portion includes a fourth end plate, the third end plate and the fourth end plate are arranged opposite to each other, the second liquid outlet is arranged on the third end plate, the second liquid inlet is arranged on the fourth end plate, the third end plate and the first end plate are located on the same side, and the second end plate and the fourth end plate are located on the same side.

[0016] In one embodiment, the flow direction of the cooling liquid in the liquid cooling plate is opposite to the flow direction of the immersion liquid in the box.

[0017] In one embodiment, the battery pack includes a plurality of the boxes and a plurality of the liquid cooling plates, and the plurality of the boxes and the plurality of the liquid cooling plates are staggered and arranged in a direction perpendicular to the thickness of the liquid cooling plates.

[0018] In one embodiment, the liquid cooling plate includes a cover plate adjacent to the box body, and the cover plate also covers and seals the accommodation space.

[0019] In one embodiment, along the length direction of the box, a plurality of the boxes are adjacent to each other in sequence.

[0020] In one embodiment, along the length direction of the box, the immersion liquid in adjacent boxes flows in the same direction; along the length direction of the liquid cooling plate, the cooling liquid in adjacent liquid cooling plates flows in the same direction.

[0021] In one embodiment, each of the boxes is provided with a chamber, and along the length direction of the boxes, two adjacent boxes share a partition plate to separate the two chambers.

[0022] In one embodiment, along the thickness direction of the box body, the box body includes a first side plate close to or far away from the liquid cooling plate, a portion of the first side plate located at the first end is provided with the first liquid inlet, and a portion of the first side plate located at the second end is provided with the second liquid inlet; along the length direction of the liquid cooling plate, the third end includes a third end plate, the fourth end includes a fourth end plate, the third end plate and the fourth end plate are arranged opposite to each other, the second liquid outlet is arranged on the third end plate, and the second liquid inlet is arranged on the fourth end plate.

[0023] In one embodiment, along the length direction of the liquid cooling plate, adjacent liquid cooling plates are spaced apart and have a spacing space, and at least part of the first liquid inlet, the first liquid outlet, the second liquid inlet, and the second liquid outlet are exposed in the spacing space.

[0024] In one embodiment, the first liquid inlets of the plurality of boxes are interconnected; and / or

[0025] The second liquid inlets of the plurality of liquid cooling plates are connected to each other.

[0026] In a second aspect, the present application also provides a battery system, including a control component and a battery pack as described above, wherein the control component and the battery pack are connected.

[0027] The battery pack of the embodiment of the present application includes a case, a battery, and a liquid cooling plate. The case contains flowing immersion liquid, and the immersion liquid is in direct contact with the battery in the case. The case has a first end and a second end that are relatively arranged, and the first end is provided with a first liquid inlet, and the second end is provided with a first liquid outlet. When the immersion liquid is injected into the accommodation space of the case through the first liquid inlet, it is at a relatively low temperature state. As the immersion liquid flows in the accommodation space, the temperature of the immersion liquid gradually increases, and then is discharged from the first liquid outlet; the liquid cooling plate contains flowing cooling liquid, and the liquid cooling plate is in indirect contact with the battery.

[0028] The liquid cooling plate also has a third end and a fourth end that are arranged opposite to each other. The third end is provided with a second liquid outlet, and the fourth end is provided with a second liquid inlet. The coolant enters the liquid cooling plate through the second liquid inlet. When entering the liquid cooling plate, the coolant is also at a relatively low temperature state. As the coolant flows in the liquid cooling plate, the temperature of the coolant gradually increases, and then is discharged from the second liquid outlet. Among them, the first end and the third end are adjacent, and the second end and the fourth end are adjacent.

[0029] Therefore, the first liquid inlet of the immersion liquid and the second liquid outlet of the cooling liquid are relatively close, and the first liquid outlet of the immersion liquid and the second liquid inlet of the cooling liquid are also relatively close. It can be understood that although the temperature of the immersion liquid at the first liquid outlet of the second end is relatively high, which is not conducive to the heat dissipation of the area near the second end of the box body, the second liquid inlet close thereto is injected with coolant at a lower temperature, and the coolant at a lower temperature can effectively help the area near the second end to dissipate heat and cool down.

[0030] Similarly, although the temperature of the coolant at the second liquid outlet of the third end is relatively high, which is not conducive to the third end of the liquid cooling plate absorbing the heat of the first end of the box adjacent to it, the first liquid inlet close to it is injected with immersion liquid with a lower temperature. The immersion liquid with a lower temperature can effectively help the area near the first end to dissipate heat and cool down.

[0031] Therefore, for the battery in the box, whether at the first end or the second end of the box, there is always a cooling medium with a lower temperature that can effectively help the battery cool down. This embodiment carefully arranges the relative positions of the first liquid inlet and the first liquid outlet of the immersion liquid and the second liquid inlet and the second liquid outlet of the cooling liquid, so that the immersion liquid and the cooling liquid of the battery pack work together, and the battery can be fully cooled in different areas, ensuring that the heat generated by the battery is dispersed more evenly and effectively, reducing the temperature difference on the battery surface, avoiding the accumulation of heat in the local area of ​​the battery, making the temperature distribution of the entire battery more uniform, and reducing the risk of battery performance degradation and shortened life due to temperature differences. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the first structure of a battery pack provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the internal cross-section of a battery pack provided in an embodiment of the present application;

[0034] Figure 3 A second structural schematic diagram of a battery pack provided in an embodiment of the present application;

[0035] Figure 4 for Figure 1 A schematic diagram of the structure of the battery pack from another angle;

[0036] Figure 5 A third structural schematic diagram of a battery pack provided in an embodiment of the present application;

[0037] Figure 6 for Figure 5 A schematic diagram of the structure of the battery pack from another angle;

[0038] Figure 7 for Figure 6The battery pack shown is a cross-sectional view along AA;

[0039] Figure 8 A fourth structural schematic diagram of a battery pack provided in an embodiment of the present application;

[0040] Fig. 9 for Figure 8 A schematic diagram of the structure of the battery pack from another angle;

[0041] Fig.10 for Figure 8 The schematic diagram of the structure of the battery pack shown is from another angle;

[0042] Fig.11 for Figure 8 The battery pack is shown in cross-section along BB. DETAILED DESCRIPTION

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0044] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] See also Figure 1 , Figure 1 The first structural schematic diagram of the battery pack provided in the embodiment of the present application. The battery pack 10 of this embodiment combines indirect liquid cooling and immersion cooling to provide a more effective thermal management solution. The battery pack 10 includes a box 100, a battery 200, and a liquid cooling plate 300.

[0046] The box 100 is the external structure of the battery pack 10, which is used to protect the internal battery 200 and the immersion cooling system. A storage space is provided in the box 100, and the storage space is used to store immersion liquid. The immersion liquid can be in direct contact with the battery 200 in the storage space. The box 100 has a first end 110 and a second end 120 that are arranged opposite to each other. The first end 110 is provided with a first liquid inlet 130, and the second end 120 is provided with a first liquid outlet 140. When the immersion liquid is injected into the storage space of the box 100 through the first liquid inlet 130, it is in a relatively low temperature state. As the immersion liquid flows in the storage space, due to the direct contact between the immersion liquid and the battery 200, the temperature of the immersion liquid gradually increases, and then is discharged from the first liquid outlet 140. In this embodiment, the immersion liquid in the box 100 is flowing, which can more effectively take away the heat and improve the heat dissipation effect.

[0047] The battery 200 is the core part of the battery pack 10, which is arranged in the accommodation space and surrounded by the immersion liquid. The heat generated by the battery 200 during the charging and discharging process is effectively dissipated through the immersion liquid. The material system of the battery 200 is not limited. The material system can be a ternary lithium battery, a lithium iron phosphate battery, or a lithium manganese iron phosphate battery. The battery 200 can be a square battery, a cylindrical battery, a soft pack battery, etc.

[0048] The liquid cooling plate 300 is adjacent to the box body 100 and is in indirect contact with the battery 200. The liquid cooling plate 300 can be located at any position of the side, top, or bottom of the box body 100. The liquid cooling plate 300 shown in the figure is located at the bottom of the box body 100. The liquid cooling plate 300 contains a coolant, which flows inside the liquid cooling plate 300 and can absorb and take away the heat transferred from the battery 200 to the liquid cooling plate 300. The liquid cooling plate 300 also has a third end 310 and a fourth end 320 arranged opposite to each other. The third end 310 is provided with a second liquid outlet 340, and the fourth end 320 is provided with a second liquid inlet 330. The coolant enters the liquid cooling plate 300 through the second liquid inlet 330 . The coolant is also at a relatively low temperature when entering the liquid cooling plate 300 . As the coolant flows in the liquid cooling plate 300 , the temperature of the coolant gradually increases because the coolant absorbs the heat transferred from the battery 200 to the liquid cooling plate 300 , and then is discharged from the second liquid outlet 340 .

[0049] Among them, the first end 110 is adjacent to the third end 310, and the second end 120 is adjacent to the fourth end 320. Therefore, the first liquid inlet 130 of the immersion liquid and the second liquid outlet 340 of the cooling liquid are relatively close, and the first liquid outlet 140 of the immersion liquid and the second liquid inlet 330 of the cooling liquid are also relatively close. It can be understood that although the temperature of the immersion liquid at the first liquid outlet 140 of the second end 120 is relatively high, which is not conducive to the heat dissipation of the area near the second end 120 of the box body 100, the second liquid inlet 330 close to it is injected with coolant with a lower temperature, and the coolant with a lower temperature can effectively help the area near the second end 120 to dissipate heat and cool down.

[0050] Similarly, although the temperature of the coolant at the second liquid outlet 340 of the third end 310 is high, which is not conducive to the third end 310 of the liquid cooling plate 300 absorbing the heat of the first end 110 of the box 100 adjacent thereto, the first liquid inlet 130 close thereto injects the immersion liquid with a lower temperature, and the immersion liquid with a lower temperature can effectively help the area near the first end 110 to dissipate heat and cool down. Therefore, for the battery 200 in the box 100, whether at the first end 110 or the second end 120 of the box 100, there is always a cooling medium with a lower temperature that can effectively help the battery 200 to cool down.

[0051] In this embodiment, the relative positions of the first liquid inlet 130 and the first liquid outlet 140 of the immersion liquid and the second liquid inlet 330 and the second liquid outlet 340 of the cooling liquid are carefully arranged so that the immersion liquid and the cooling liquid of the battery pack 10 can work together, and the battery 200 can be fully cooled in different areas, ensuring that the heat generated by the battery 200 is dispersed more evenly and effectively, reducing the temperature difference on the surface of the battery 200, avoiding the local accumulation of heat in the battery 200, making the temperature distribution of the entire battery 200 more uniform, and reducing the risk of performance degradation and shortened life of the battery 200 due to temperature differences.

[0052] It should be noted that in this embodiment, the liquid cooling plate 300 is adjacent to the box 100, which can be understood as the liquid cooling plate 300 can be adjacent to any side of the box 100. For example, the liquid cooling plate 300 can be adjacent to the top plate, bottom plate or any other side of the box 100. Moreover, the box 100 can be considered to include two ends, namely the first end 110 and the second end 120, whether considered from the length direction, width direction or height direction; similarly, the liquid cooling plate 300 can be considered to include two ends, namely the third end 310 and the fourth end 320, whether considered from the length direction, width direction or height direction.

[0053] Please combine Figure 2 , Figure 2 A schematic diagram of the internal cross-section of a battery pack 200 provided in an embodiment of the present application.

[0054] In some embodiments, the distance between the first liquid inlet 130 and the second liquid outlet 340 is L1, which can be measured by inserting a vernier caliper into the first liquid inlet 130 and the second liquid outlet 340, respectively. Of course, the distance between the first liquid inlet 130 and the second liquid outlet 340 can also be measured by a measuring tool such as a ruler. 1cm≤L1≤10cm, L1 can be 1cm, 2cm, 3cm, 4cm, 5cm, 6cm, 7cm, 8cm, 9cm, 10cm, etc. When L1 is within this range, it can be ensured that the coolant in the liquid cooling plate 300 and the immersion liquid in the box 100 can fully exchange heat, thereby achieving a uniform heat effect.

[0055] In some embodiments, the distance between the first liquid outlet 140 and the side of the box 100 away from the liquid cooling plate 300 is L2, and L2 is the distance between the first liquid outlet 140 and the top surface of the box 100. L2 can be measured by inserting a vernier caliper into the first liquid outlet 140 and overlapping the top surface of the box 100. Of course, the distance between the first liquid outlet 140 and the top surface of the box 100 can also be measured by a ruler or other measuring tools. 15cm≤L2≤22cm, L2 can be 15cm, 16cm, 17cm, 18cm, 19cm, 20cm, 21cm, 22cm, etc. L2 within the above range can make the first liquid outlet 140 higher than or equal to the height of the aluminum row and other accessories above the battery 200 to ensure that the immersion liquid completely immerses the battery 200. When this range is exceeded, the immersion liquid that has absorbed heat will naturally float up in the accommodation space due to its low density and is not suitable for discharge.

[0056] In some embodiments, the distance between the second liquid inlet 330 and the side of the liquid cooling plate 300 close to the box 100 is L3, L3 can be the distance between the second liquid inlet 330 and the box 100, and the distance between the second liquid outlet 340 and the side of the liquid cooling plate 300 close to the box 100 is L4, L4 can be the distance between the second liquid outlet 340 and the box 100, wherein L4≤L3, i.e., the second liquid inlet 330 is further away from the box 100 than the second liquid outlet 340, and the second liquid inlet 330 is lower than the second liquid outlet 340, thereby ensuring that the coolant can be immersed in the liquid cooling plate 300 to the maximum extent. In addition, 2cm≤L4≤6cm, L4 can be 2cm, 3cm, 4cm, 5cm, 6cm, etc.

[0057] In some embodiments, the height of the box 100 is H1, H1 is the distance between the upper surface and the lower surface of the box 100, the height of the liquid cooling plate 300 is H2, H2 is the distance between the upper surface and the lower surface of the liquid cooling plate 300, 2≤H1 / H2≤5, H1 / H2 can be 2, 3, 4, 5, etc. The height of the box 100 is between 2 and 5 times the height of the liquid cooling plate 300, and the immersion liquid inside the box 100 is between 2 and 5 times the cooling liquid inside the liquid cooling plate 300, so as to ensure that the cooling liquid in the liquid cooling plate 300 and the immersion liquid inside the box 100 can fully exchange heat to achieve a uniform heat effect.

[0058] In some embodiments, the length of the box 100 is D1, D1 is the distance between the left surface and the right surface of the box 100, the length of the liquid cooling plate 300 is D2, D2 is the distance between the left surface and the right surface of the liquid cooling plate 300, 15cm≤D1-D2≤22cm, D1-D2 represents the distance that the liquid cooling plate 300 is shorter than the box 100, and can be 15cm, 16cm, 17cm, 18cm, 19cm, 20cm, 21cm, 22cm, etc. The liquid cooling plate 300 is shorter than the box 100, and an empty space is formed next to the box 100. Within this range, on the one hand, a connection space is reserved for the pipes of the first liquid inlet 130 and the first liquid outlet 140 on the adjacent box 100, and on the other hand, the space utilization rate of the battery 200 system can be ensured.

[0059] Please combine Figure 3 , Figure 3 This is a schematic diagram of the second structure of the battery pack provided in the embodiment of the present application. In this embodiment, the position of the first liquid inlet 130 at the first end 110, the position of the first liquid outlet 140 at the second end 120, the position of the second liquid inlet 330 at the fourth end 320, and the position of the second liquid outlet 340 at the third end 310 can be adjusted according to the layout requirements. Figure 1 and Figure 3 The first liquid inlet 130 is located at different positions on the first end 110, but is located on the first end 110; and Figure 1 and Figure 3 The positions of the first liquid outlet 140 at the second end 120 are also different, but are all located at the second end 120. This embodiment is not limited to this, and it is only necessary to arrange the first end 110 of the first liquid inlet 130 adjacent to the third end 310 where the second liquid outlet 340 is arranged, and to arrange the second end 120 of the first liquid outlet 140 adjacent to the fourth end 320 where the second liquid inlet 330 is arranged, so that the synergistic effect between the immersion liquid and the cooling liquid can dissipate heat from the battery 200 more evenly and effectively.

[0060] In some embodiments, see Figure 4 , Figure 4 for Figure 1 A schematic diagram of the structure of the battery pack shown in another angle. Along the length direction of the box 100, the first end 110 includes a first end plate 111, the second end 120 includes a second end plate 121, the first end plate 111 and the second end plate 121 are arranged opposite to each other, the first liquid inlet 130 is arranged on the first end plate 111, and the first liquid outlet 140 is arranged on the second end plate 121; along the length direction of the liquid cooling plate 300, the third end 310 includes a third end plate 311, the fourth end 320 includes a fourth end plate 321, the third end plate 311 and the fourth end plate 321 are arranged opposite to each other, the second liquid outlet 340 is arranged on the third end plate 311, the second liquid inlet 330 is arranged on the fourth end plate 321, the third end plate 311 and the first end plate 111 are located on the same side, and the second end plate 121 and the fourth end plate 321 are located on the same side.

[0061] In this embodiment, the box body 100 has two ends along its length direction. The first end 110 is located at one end of the box body 100 and includes a first end plate 111. The first end plate 111 is provided with a first liquid inlet 130 of the immersion liquid for injecting low-temperature immersion liquid. The second end 120 is located at the other opposite end of the box body 100 and includes a second end plate 121. The second end plate 121 is provided with a first liquid outlet 140 of the immersion liquid for discharging the immersion liquid whose temperature rises after absorbing heat. Similarly, the liquid cooling plate 300 also has two ends along its length direction. The third end 310 is located at one end of the liquid cooling plate 300 and includes a third end plate 311. The third end plate 311 is provided with a second liquid outlet 340 of the cooling liquid for discharging the cooling liquid whose temperature rises after absorbing heat. The fourth end portion 320 is located at the other end opposite to the liquid cooling plate 300, and includes a fourth end plate 321, on which a second liquid inlet 330 of the cooling liquid is provided, for injecting low-temperature cooling liquid. That is, in this embodiment, the first liquid inlet 130 and the first liquid outlet 140 are arranged along the length direction of the box body 100, and the second liquid inlet 330 and the second liquid outlet 340 are also arranged along the length direction of the liquid cooling plate 300, so that the flow path of the immersion liquid and the cooling liquid can be set longer, and more time can be spent on absorbing and taking away heat during the flow process, thereby dissipating heat more effectively.

[0062] Among them, the third end plate 311 and the first end plate 111 are located on the same side, and the second end plate 121 and the fourth end plate 321 are located on the same side. Therefore, the second outlet 340 of the cooling liquid and the first inlet 130 of the immersion liquid are on the same side and are relatively close in spatial layout, and the second inlet 330 of the cooling liquid and the first outlet 140 of the immersion liquid are also on the same side and are relatively close in spatial layout. It can be understood that although the temperature of the immersion liquid near the first outlet 140 is higher, the temperature of the cooling liquid near the second inlet 330 located on the same side and relatively close is lower, and although the temperature of the cooling liquid near the second outlet 340 is higher, the temperature of the immersion liquid near the first inlet 130 located on the same side and relatively close is lower, so that in different areas of the battery 200, there is always a cooling medium with a lower temperature absorbing heat, which helps to more evenly and effectively disperse the heat generated by the battery 200 and avoid local accumulation of heat in the battery 200.

[0063] In some embodiments, please refer to Figure 1 and Figure 3 , the flow direction of the coolant in the liquid cooling plate 300 is opposite to the flow direction of the immersion liquid in the box 100. It can be understood that in this embodiment, when the immersion liquid is injected into the box 100 from the first liquid inlet 130 of the first end 110 and discharged from the first liquid outlet 140 of the second end 120, the coolant is simultaneously injected into the liquid cooling plate 300 from the second liquid inlet 330 of the fourth end 320 and flows out from the second liquid outlet 340 of the third end 310. Since the first end 110 and the third end 310 are adjacent, and the second end 120 and the fourth end 320 are adjacent, the flow direction of the coolant in the liquid cooling plate 300 can be opposite to the flow direction of the immersion liquid in the box 100.

[0064] It can be understood that along the flow direction of the immersion liquid in the box 100, the immersion liquid absorbs the heat of the battery 200 during the flow process and the temperature gradually rises, and along the flow direction of the cooling liquid in the liquid cooling plate 300, the temperature of the cooling liquid also rises after absorbing heat in the liquid cooling plate 300. Since the flow direction of the cooling liquid in the liquid cooling plate 300 is opposite to the flow direction of the immersion liquid in the box 100, the temperature change trend of the immersion liquid in the box 100 and the temperature change trend of the cooling liquid in the liquid cooling plate 300 are opposite to those of the battery 200, so that in different areas on both sides of the battery 200, there is always a cooling medium with a lower temperature absorbing heat. For example, on one side of the battery 200, the temperature of the immersion liquid is higher and the temperature of the coolant is lower, and on the other side of the battery 200, the temperature of the coolant is higher and the temperature of the immersion liquid is lower, which helps to disperse the heat generated by the battery 200 more evenly and effectively, reduce the temperature difference on the surface of the battery 200, and avoid local accumulation of heat in the battery 200.

[0065] For example, the liquid cooling plate 300 is adjacent to the bottom plate of the box 100, and the immersion liquid enters from the first end plate 111 on the left side of the box 100. The flow direction of the immersion liquid is from left to right, and the initial temperature is low. As the heat of the battery 200 is absorbed, its temperature gradually increases from left to right. The cooling liquid enters from the fourth end plate 321 on the right side of the liquid cooling plate 300. The flow direction of the cooling liquid is from right to left, and the initial temperature is also low. As the heat of the battery 200 is absorbed, its temperature gradually increases from right to left. During the simultaneous flow of the two cooling media, the immersion liquid and the coolant, the temperature of the immersion liquid is lower in the area near the left side of the battery 200, while the temperature of the immersion liquid is higher in the area near the right side of the battery 200. At the same time, the temperature of the coolant is higher in the area near the left side of the battery 200, while the temperature of the coolant is lower in the area near the right side of the battery 200. The immersion liquid and the coolant can form a dynamic balance of heat exchange on both sides of the battery 200. Although the temperature of the immersion liquid in the area on the right side of the battery 200 is higher, which is not conducive to the heat dissipation of the area on the right side of the battery 200, due to the lower temperature of the coolant in the area on the right side of the battery 200, the lower temperature of the coolant can effectively help the area on the right side of the battery 200 to cool down. Similarly, although the temperature of the coolant in the area on the left side of the battery 200 is higher, which is not conducive to the heat dissipation of the area on the left side of the battery 200, due to the lower temperature of the immersion liquid in the area on the left side of the battery 200, the lower temperature of the immersion liquid can also effectively help the area on the left side of the battery 200 to cool down. Therefore, this reverse flow strategy realizes the temperature complementarity of the immersion liquid and the coolant during the heat dissipation process of the battery 200, and optimizes the overall thermal management effect of the battery pack 10.

[0066] It should be noted that, in this embodiment, the flow direction of the cooling liquid in the liquid cooling plate 300 and the immersion liquid in the box 100 refers to the overall flow trend or directionality, but does not limit the specific flow paths of the cooling liquid in the liquid cooling plate 300 and the immersion liquid in the box 100.

[0067] In some embodiments, the flow path of the immersion liquid in the housing 100 can be changed by adjusting the position of the first liquid inlet 130 on the first end plate 111 and the position of the first liquid outlet 140 on the second end plate 121 to optimize the thermal management performance.

[0068] Exemplarily, the first liquid inlet 130 is located on a side of the first end plate 111 close to the liquid cooling plate 300, and the first liquid outlet 140 is located on a side of the second end plate 121 away from the liquid cooling plate 300. For example, the liquid cooling plate 300 is adjacent to the bottom plate of the box body 100, and by designing the first liquid outlet 140 and the first liquid inlet 130 to have a height difference, the immersion liquid has more time and space to exchange heat with the surface of the battery 200 before flowing out of the box body 100, so that the immersion liquid has more sufficient contact with the surface of the battery 200, and a better heat dissipation effect is obtained, and more uniform heat dissipation is achieved.

[0069] In another example, for example, the liquid cooling plate 300 is still adjacent to the bottom plate of the box body 100, the first liquid inlet 130 is located on the side of the first end plate 111 away from the liquid cooling plate 300, and the first liquid outlet 140 is located on the side of the second end plate 121 close to the liquid cooling plate 300. The height of the first liquid inlet 130 can be higher than the first liquid outlet 140. It can be understood that the immersion liquid enters from the higher liquid inlet and can naturally flow downward during the flow process, which increases the turbulence of the immersion liquid and can also improve the contact area and heat exchange efficiency between the immersion liquid and the surface of the battery 200.

[0070] In another example, along the width direction of the box body 100, the first liquid inlet 130 is located in the middle of the first end plate 111, and the first liquid outlet 140 is located in the middle of the second end plate 121; and / or along the width direction of the liquid cooling plate 300, the second liquid outlet 340 is located in the middle of the third end plate 311, and the second liquid inlet 330 is located in the middle of the fourth end plate 321. In the width direction of the box body 100, the immersion liquid enters from the middle of the first end plate 111, flows to the middle of the second end plate 121, and exits. During the flow process, the immersion liquid can evenly contact different areas on the surface of the battery 200, thereby achieving more uniform heat dissipation. Similarly, along the width direction of the liquid cooling plate 300, the coolant enters from the middle of the fourth end plate 321, flows to the middle of the third end plate 311 and exits. During the flow, the coolant can also contact different areas of the liquid cooling plate 300 more evenly, thereby ensuring that the heat transferred from the battery 200 to the liquid cooling plate 300 is evenly and effectively dissipated, effectively avoiding the appearance of local hot spots on the surface of the battery 200, and improving the uniformity of heat dissipation.

[0071] Please refer to Figure 5 , Figure 6 and Figure 7 , Figure 5 A third structural schematic diagram of a battery pack provided in an embodiment of the present application; Figure 6 for Figure 5 A schematic diagram of the structure of the battery pack from another angle; Figure 7 for Figure 6The battery pack is shown in a cross-sectional view along AA. In some embodiments, the battery pack 10 includes a plurality of boxes 100 and a plurality of liquid cooling plates 300, and the plurality of boxes 100 and the plurality of liquid cooling plates 300 are staggered and arranged in a thickness direction perpendicular to the liquid cooling plates 300. In this embodiment, the battery pack 10 is composed of a plurality of boxes 100 and a plurality of liquid cooling plates 300. Along the thickness direction of the liquid cooling plates 300, or the thickness direction of the boxes 100, a liquid cooling plate 300 is provided between two adjacent boxes 100, and a box 100 is provided between two adjacent liquid cooling plates 300. Exemplarily, the liquid cooling plate 300 may be located on the bottom plate of the box 100. Since multiple boxes 100 and multiple liquid cooling plates 300 are arranged in an interlaced manner, except for the top plate of the top box 100, which is not adjacent to the liquid cooling plate 300, only the bottom plate is adjacent to the liquid cooling plate 300, and the upper and lower sides of each other box 100 are provided with liquid cooling plates 300; in another example, a liquid cooling plate 300 may be additionally arranged on the top plate of the top box 100, so that the upper and lower sides of each box 100 are provided with liquid cooling plates 300. Therefore, the heat generated by the battery 200 can be absorbed and taken away from the coolant in the liquid cooling plates 300 on the upper and lower sides and the immersion liquid in the box 100 from different directions, which effectively improves the heat dissipation efficiency. Furthermore, since the fourth end 320 where the second liquid inlet 330 of the coolant in the liquid cooling plates 300 on the upper and lower sides of each box 100 is located is adjacent to the second end 120 where the first liquid outlet 140 of the immersion liquid is located, and the third end 310 where the second liquid outlet 340 of the coolant is located is adjacent to the first end 110 where the first liquid inlet 130 of the immersion liquid is located, the coolant in the liquid cooling plates 300 on the upper and lower sides of each box 100 can flow in the opposite direction relative to the immersion liquid, and the coolant in the liquid cooling plates 300 on the upper and lower sides and the immersion liquid in the box 100 form different temperature gradients relative to the battery 200, so that in different areas of the battery 200, there is always a cooling medium with a lower temperature absorbing heat, which reduces the temperature difference on the surface of the battery 200 and improves the overall heat dissipation effect of the battery pack 10. Moreover, the staggered arrangement of multiple boxes 100 and multiple liquid cooling plates 300 makes the battery pack 10 easy to expand and modularize, so as to adapt to battery packs 10 of different sizes and needs.

[0072] It should be noted that, in some embodiments, the liquid cooling plate 300 may be located on the top plate of the box body 100 , which is not limited in this embodiment.

[0073] In some embodiments, the liquid cooling plate 300 includes a cover plate 350 adjacent to the box 100, and the cover plate 350 also covers the sealed accommodation space. In this embodiment, the cover plate 350 itself is not only a part of the liquid cooling plate 300, but also assumes the function of sealing the box 100, so the box 100 does not need to be additionally provided with a seal, and the liquid cooling plate 300 and the box 100 can share the structure of the cover plate 350. This integrated design reduces the use of materials for the box 100. Exemplarily, small holes can also be provided on the cover plate 350, so that the immersion liquid and the coolant at different temperatures can be mixed to a certain extent, so that the heat can be dissipated more evenly.

[0074] It is understandable that when the battery pack 10 includes only one box 100 and one liquid cooling plate 300, one seal setting of the box 100 can be saved. When the battery pack 10 includes multiple boxes 100 and multiple liquid cooling plates 300, since the multiple boxes 100 and multiple liquid cooling plates 300 are staggered, the cover plates 350 of the liquid cooling plates 300 on the upper and lower sides of each box 100 can be used to seal the upper and lower sides of the box 100, respectively, so more seal settings can be saved. For example, if the battery pack 10 includes 4 boxes 100 and 4 liquid cooling plates 300, then 7 seal settings can be saved.

[0075] Therefore, the design of integrating the sealing function of the liquid cooling plate 300 and the box body 100 in this embodiment reduces the use of materials, simplifies the overall structure of the battery pack 10, reduces the overall weight of the battery pack 10, improves the volume energy density of the battery pack 10, simplifies the manufacturing and assembly process, and thus reduces the overall cost.

[0076] Please refer to Figure 8 , Fig. 9 , Fig.10 and Fig.11 , Figure 8 A fourth structural schematic diagram of a battery pack provided in an embodiment of the present application; Fig. 9 for Figure 8 A schematic diagram of the structure of the battery pack from another angle; Fig.10 for Figure 8 The schematic diagram of the structure of the battery pack shown is from another angle; Fig.10 for Fig. 9 The battery pack is shown in a cross-sectional view along BB. In some embodiments, the battery pack 10 includes a plurality of boxes 100 and a plurality of liquid cooling plates 300, wherein the plurality of boxes 100 are adjacent to each other in sequence along the length direction of the boxes 100; and the plurality of boxes 100 and the plurality of liquid cooling plates 300 are staggered along the height direction of the boxes 100.

[0077] It can be understood that the battery pack 10 includes multiple battery cells, each of which can include a box 100 and a liquid cooling plate 300 stacked in the same manner. In addition to arranging multiple battery cells in height, the battery pack 10 can also be adjacent to multiple battery cells in the horizontal direction, thereby increasing the scale of the battery pack 10. Therefore, in this embodiment, the battery pack 10 has a high degree of modularity and scalability and can adapt to a variety of different application scenarios. Whether it is an electric vehicle, an energy storage system or other equipment that requires high energy density and efficient heat dissipation, the scale of the battery pack 10 can be adjusted to meet the needs.

[0078] In some embodiments, each box 100 has a chamber therein, and along the length direction of the box 100 , two adjacent boxes 100 share a separation plate 150 to separate the two chambers.

[0079] In this embodiment, two adjacent boxes 100 can share a separator 150 to further reduce the structural materials of the battery pack 10. For example, each row of the battery pack 10 includes three boxes 100, and the middle box 100 and the boxes 100 on the left and 100 on the right share a separator 150, which can save the production of two separators 150, further reduce the weight of the battery pack 10, and make the entire array of battery packs 10 more compact.

[0080] In some embodiments, along the length direction of the liquid cooling plate 300 , the flow direction of the cooling liquid in adjacent liquid cooling plates 300 is the same, and the flow direction of the immersion liquid in adjacent boxes 100 is the same.

[0081] It can be understood that along the length direction of the box 100, after the immersion liquid absorbs the heat of the battery 200, its temperature will gradually increase with the flow direction of the immersion liquid. When it is close to the adjacent box 100, the temperature of the immersion liquid is relatively high, which is not conducive to the heat dissipation of the battery 200 in this area. However, since the immersion liquid of the adjacent box 100 is in the initial state of flow and has not yet flowed through the heat source or has flowed through less heat source, its temperature is relatively low. The immersion liquid with a lower temperature can effectively help disperse the heat in this area. Therefore, along the length direction of multiple boxes 100, the immersion liquid of two adjacent boxes 100 forms a temperature difference near the connection area of ​​the two boxes 100, which can complement each other to cool the battery 200, so that the entire battery pack 10 can dissipate heat more evenly.

[0082] Exemplarily, the liquid cooling plate 300 is adjacent to the bottom plate of the box 100. In this embodiment, except for the first row of boxes 100, only the bottom plate is provided with the liquid cooling plate 300, and the other boxes 100 are provided with liquid cooling plates 300 on both the upper and lower sides, and except for the first row of boxes 100, each box 100 is provided with boxes 100 on both the left and right sides. Among them, on the upper and lower sides of the box 100, the flow direction of the coolant in the liquid cooling plate 300 is opposite to the flow direction of the immersion liquid in the box 100, and on the left and right sides of the box 100, the flow direction of the immersion liquid in the adjacent boxes 100 is the same as the flow direction of the immersion liquid in the box 100, so that the cooling medium with a lower temperature always absorbs heat in different areas above, below, left and right of the battery 200 in the box 100, which reduces the temperature difference on the surface of the battery 200 and improves the overall heat dissipation effect of the battery pack 10.

[0083] In some embodiments, along the thickness direction of the box body 100, the box body 100 includes a first side plate 160 close to or far away from the liquid cooling plate 300, a portion of the first side plate 160 located at the first end 110 is provided with a first liquid inlet 130, and a portion of the first side plate 160 located at the second end 120 is provided with a second liquid inlet 330; along the length direction of the liquid cooling plate 300, the third end 310 includes a third end plate 311, the fourth end 320 includes a fourth end plate 321, the third end plate 311 and the fourth end plate 321 are arranged opposite to each other, the second liquid outlet 340 is arranged on the third end plate 311, and the second liquid inlet 330 is arranged on the fourth end plate 321.

[0084] Among them, the first side plate 160 can be the top plate or the bottom plate of the box body 100. Exemplarily, the first side plate 160 is the top plate of the box body 100, then the first liquid inlet 130 is arranged at the part of the first side plate located at the first end 110, and the first liquid outlet 140 is arranged at the part of the first side plate located at the second end 120, so the first liquid inlet 130 and the first liquid outlet are arranged at both ends of the first side plate. It can be understood that the battery pack 10 in this embodiment has multiple boxes 100 adjacent to each other horizontally, and the boxes 100 and the liquid cooling plate 300 are staggered in the height direction. Therefore, the first liquid inlet 130 and the second liquid inlet 330 of the box body 100 are arranged at intervals on the top plate of the box body 100, so that each row of boxes 100 can be closely arranged in the horizontal direction, reducing the space waste caused by the improper position of the first liquid inlet 130 and the first liquid outlet 140.

[0085] It should be noted that the first side plate may also be the bottom plate of the box body 100, which is not limited in this embodiment.

[0086] In some embodiments, along the length direction of the liquid cooling plate 300, adjacent liquid cooling plates 300 are spaced apart and have a spacing space, and at least part of the first liquid inlet 130, the first liquid outlet 140, the second liquid inlet 330 and the second liquid outlet 340 are exposed in the spacing space.

[0087] The liquid cooling plates 300 and the box body 100 are arranged in a staggered manner in height, and in the horizontal direction, multiple liquid cooling plates 300 are arranged at intervals, which reserves sufficient space for the arrangement of the first liquid inlet 130, the first liquid outlet 140, the second liquid inlet 330, and the second liquid outlet 340, ensuring the smooth flow of the immersion liquid and the coolant in the battery pack 10. The first liquid inlet 130, the first liquid outlet 140, the second liquid inlet 330, and the second liquid outlet 340 are arranged in the interval space, which is also convenient for inspection and maintenance of these interfaces.

[0088] In some embodiments, the first liquid inlets 130 of the plurality of boxes 100 are interconnected; and / or the second liquid inlets 330 of the plurality of liquid cooling plates 300 are interconnected.

[0089] For example, by branching from a main pipeline to each first liquid inlet 130, and / or by branching from a main pipeline to each second liquid inlet 330, it can be ensured that all boxes 100 can obtain a uniform supply of immersion liquid, or all liquid cooling plates 300 can obtain a uniform supply of cooling liquid. The design of interconnected first liquid inlets 130 or second liquid inlets 330 can greatly simplify the pipeline layout and reduce the complexity and length of the pipeline. This not only reduces the manufacturing cost and maintenance difficulty of the battery pack 10, but also improves the overall aesthetics and space utilization of the battery pack 10.

[0090] The embodiment of the present application also provides a battery system, including a control component and a battery pack 10 of any of the above embodiments. The control component includes a battery management system (BMS, Battery Management System), a battery disconnect unit (BDU, Battery Disconnect Unit), etc. The battery management system is mainly for intelligent management and maintenance of each battery unit 300, monitoring the status of the battery, preventing the battery from overcharging and over-discharging, so as to extend the service life of the battery. The battery management system also controls the flow of the immersion liquid and the flow of the coolant. Specifically, the battery management system can control the flow rate of the immersion liquid according to the temperature of the immersion liquid, and the battery management system can control the flow rate of the coolant according to the temperature of the coolant. The main function of the battery disconnect unit is to receive electrical energy from the charging system, and then control the speed and torque of the motor through the controller to achieve the drive of the car. At the same time, the battery drive unit also needs to monitor the status of the battery in real time to ensure the safe operation of the battery. The battery pack 10 combines indirect liquid cooling and immersion cooling, which not only fully utilizes the advantages of the two cooling technologies, but also sets the second end 120 of the first liquid outlet 140 adjacent to the fourth end 320 of the second liquid inlet 330, so that in different areas of the battery 200, there is always a cooling medium with a lower temperature absorbing heat, reducing the temperature difference on the surface of the battery 200, and improving the overall heat dissipation effect of the battery pack 10, so as to better meet the heat dissipation requirements of the battery system under high power and high density operation. Moreover, multiple boxes 100 and multiple liquid cooling plates 300 can be staggered in the height direction as needed, and can be further expanded in the horizontal direction, adding more boxes 100 and liquid cooling plates 300 to increase the scale of the battery pack 10. Whether it is an electric vehicle, an energy storage system or other equipment that requires high energy density and efficient heat dissipation, the scale of the battery pack 10 can be adjusted to meet the needs.

Claims

1. A battery pack, characterized in that: include: A box body, wherein a containing space is provided therein, the containing space is used to contain the immersion liquid, the box body comprises a first end and a second end which are arranged opposite to each other, the first end is provided with a first liquid inlet, and the second end is provided with a first liquid outlet; A battery is disposed in the accommodation space; a liquid cooling plate, adjacent to the box body, the liquid cooling plate being used to contain cooling liquid, the liquid cooling plate comprising a third end and a fourth end oppositely disposed, the third end being provided with a second liquid outlet, and the fourth end being provided with a second liquid inlet; The first end portion is adjacent to the third end portion, and the second end portion is adjacent to the fourth end portion.

2. The battery pack according to claim 1, characterized in that: The distance between the first liquid inlet and the second liquid outlet is L1, 1cm≤L1≤10cm.

3. The battery pack according to claim 1, characterized in that: The distance between the first liquid outlet and the side of the box away from the liquid cooling plate is L2, 15cm≤L2≤22cm.

4. The battery pack according to claim 1, characterized in that: The distance between the second liquid inlet and the liquid cooling plate close to the box body is L3, and the distance between the second liquid outlet and the liquid cooling plate close to the box body is L4, wherein L4≤L3, 2cm≤L4≤6cm.

5. The battery pack according to claim 1, characterized in that: The height of the box is H1, the height of the liquid cooling plate is H2, and 2≤H1 / H2≤5.

6. The battery pack according to claim 1, characterized in that: The length of the box body is D1, the length of the liquid cooling plate is D2, and 15cm≤D1-D2≤22cm.

7. The battery pack according to claim 1, characterized in that: Along the length direction of the box body, the first end portion includes a first end plate, the second end portion includes a second end plate, the first end plate and the second end plate are arranged opposite to each other, the first liquid inlet is arranged on the first end plate, and the first liquid outlet is arranged on the second end plate; Along the length direction of the liquid cooling plate, the third end portion includes a third end plate, the fourth end portion includes a fourth end plate, the third end plate and the fourth end plate are arranged opposite to each other, the second liquid outlet is arranged on the third end plate, the second liquid inlet is arranged on the fourth end plate, the third end plate and the first end plate are located on the same side, and the second end plate and the fourth end plate are located on the same side.

8. The battery pack according to any one of claims 1 to 7, characterized in that: The flow direction of the cooling liquid in the liquid cooling plate is opposite to the flow direction of the immersion liquid in the box.

9. The battery pack according to claim 1, characterized in that: The battery pack includes a plurality of the boxes and a plurality of the liquid cooling plates, and the plurality of the boxes and the plurality of the liquid cooling plates are staggered and arranged in a direction perpendicular to the thickness of the liquid cooling plates.

10. The battery pack according to claim 1, characterized in that: The liquid cooling plate includes a cover plate adjacent to the box body, and the cover plate also covers and seals the accommodation space.

11. The battery pack according to claim 9, characterized in that: Along the length direction of the box body, a plurality of the boxes are adjacent to each other in sequence.

12. The battery pack according to claim 11, characterized in that: Along the length direction of the box body, the immersion liquid in adjacent boxes has the same flow direction; Along the length direction of the liquid cooling plate, the flow direction of the coolant in the adjacent liquid cooling plates is the same.

13. The battery pack according to claim 11, characterized in that: Each of the boxes is provided with a chamber, and along the length direction of the boxes, two adjacent boxes share a separation plate to separate the two chambers.

14. The battery pack according to any one of claims 11 to 13, characterized in that: Along the thickness direction of the box body, the box body includes a first side plate close to or far away from the liquid cooling plate, a portion of the first side plate located at the first end is provided with the first liquid inlet, and a portion of the first side plate located at the second end is provided with the second liquid inlet; Along the length direction of the liquid cooling plate, the third end portion includes a third end plate, the fourth end portion includes a fourth end plate, the third end plate and the fourth end plate are arranged opposite to each other, the second liquid outlet is arranged on the third end plate, and the second liquid inlet is arranged on the fourth end plate.

15. The battery pack according to claim 14, characterized in that: Along the length direction of the liquid cooling plate, adjacent liquid cooling plates are spaced apart and have a spacing space, and at least part of the first liquid inlet, the first liquid outlet, the second liquid inlet and the second liquid outlet are exposed in the spacing space.

16. The battery pack according to claim 14, characterized in that: The first liquid inlets of the plurality of boxes are interconnected; and / or The second liquid inlets of the plurality of liquid cooling plates are connected to each other.

17. A battery system, characterized in that: The battery system includes a control component and a battery pack as described in any one of claims 1-16, and the control component is connected to the battery pack.

Images