Battery pack and electric device

Abstract

The application discloses a battery pack and an electric equipment, and belongs to the technical field of batteries. In the battery pack, the first convex part and the second convex part of a liquid cooling plate part are respectively embedded in a first assembly groove and a second assembly groove, so that the liquid cooling plate part can be stably connected with a box body, the liquid cooling plate part forms a structural part of the battery pack, the overall structure of the battery pack is more stable, the structural strength of the battery pack is increased, the protection effect on single batteries is improved, the influence of collision and impact on the single batteries is weakened, the space requirement of the expansion of the single batteries can be met to a certain extent, and the safety is improved. In addition, the size parameters of the liquid cooling plate part, the first convex part and the second convex part satisfy the above relationship, so that the space utilization of the battery pack can be fully ensured, and the balance between the space utilization and the structural strength of the battery pack is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery pack and a power consumption equipment. BACKGROUND

[0002] In the related art, in order to improve the space utilization rate of the battery pack, some structural members in the battery pack are continuously simplified, which leads to a decrease in the protection measures of the single batteries in the battery pack and insufficient structural strength of the whole battery pack. SUMMARY

[0003] The application provides a battery pack, and aims to solve the technical problem of unbalanced space utilization rate and structural strength of the battery pack; another object of the application is to provide a power consumption equipment.

[0004] TECHNICAL SOLUTION The battery pack provided by the application has a first direction and a second direction intersecting with each other, and comprises:

[0005] a box body having an accommodating cavity inside, the box body comprising a first plate member and a second plate member oppositely arranged along the first direction, the first plate member and the second plate member being used to enclose the accommodating cavity;

[0006] a battery pack arranged in the accommodating cavity, the battery pack comprising a plurality of single batteries arranged along the first direction, the single batteries being located between the first plate member and the second plate member;

[0007] a liquid cooling plate member arranged on at least one side of the battery pack along the second direction, the liquid cooling plate member comprising a liquid cooling part and a connecting part; the liquid cooling part is arranged between the first plate member and the second plate member and is in contact with the plurality of single batteries; the connecting part comprises a body, a first protruding part and a second protruding part connected with each other, the body is connected with the liquid cooling part, the first protruding part protrudes towards the first plate member relative to the liquid cooling part, and the second protruding part protrudes towards the second plate member relative to the liquid cooling part;

[0008] the first plate member has a first assembly groove, the second plate member has a second assembly groove, the first protruding part is embedded in the first assembly groove, and one side of the liquid cooling part along the first direction is attached to the first plate member, the second protruding part is embedded in the second assembly groove, and the other side of the liquid cooling part along the first direction is attached to the second plate member;

[0009] along the first direction, the liquid cooling plate member has a length L mm, the first protruding part and / or the second protruding part has a fourth dimension L4 mm; and 0.05≤2L4 / L≤0.17 is satisfied.

[0010] In some embodiments, the battery pack further has a third direction intersecting with the first direction and the second direction;

[0011] The box body comprises a third plate member and a fourth plate member oppositely arranged along the third direction, the first plate member and the second plate member are arranged between the third plate member and the fourth plate member, and the first plate member, the third plate member, the second plate member and the fourth plate member are sequentially connected to form the accommodating cavity.

[0012] The third plate member has a third assembly groove, and the fourth plate member has a fourth assembly groove, and the liquid cooling plate member is embedded in the third assembly groove and the fourth assembly groove.

[0013] In some embodiments, the part of the liquid cooling plate member embedded in the third assembly groove and / or the part of the liquid cooling plate member embedded in the fourth assembly groove has a third dimension L3 along the third direction, and 0 < L3 ≤ 10 mm is satisfied.

[0014] In some embodiments, the battery pack further comprises a filling part.

[0015] The third assembly groove is provided with the filling part, and the filling part is connected with the third plate member and the liquid cooling plate member respectively; and / or, the fourth assembly groove is provided with the filling part, and the filling part is connected with the fourth plate member and the liquid cooling plate member respectively.

[0016] In some embodiments, the connecting part is connected to one side of the liquid cooling part close to the third plate member; the connecting part is embedded in the third assembly groove, and the liquid cooling part is embedded in the fourth assembly groove.

[0017] In some embodiments, the battery pack further has a third direction intersecting with the first direction and the second direction; the connecting part is connected to at least one side of the liquid cooling part along the third direction.

[0018] One of the liquid cooling part and the connecting part is provided with a plug-in part, and the other is provided with a plug-in groove, the plug-in part is arranged in the plug-in groove to connect the liquid cooling part and the connecting part.

[0019] In some embodiments, the second direction corresponds to the thickness direction of the liquid cooling plate member, and the thickness of the liquid cooling part is greater than or equal to the thickness of the connecting part.

[0020] In some embodiments, the liquid cooling part and the connecting part are of an integrated structure.

[0021] In some embodiments, the battery pack satisfies 5 mm ≤ L4 ≤ 300 mm.

[0022] In some embodiments, the second direction corresponds to a thickness direction of the single battery, and the battery pack is provided with the liquid cooling plate on both sides of the battery pack along the second direction.

[0023] In some embodiments, the single battery includes a first surface in contact with the liquid cooling part, and the liquid cooling part includes:

[0024] a main body part;

[0025] a bonding part arranged between the main body part and the first surface and connected with the main body part and the first surface respectively.

[0026] Correspondingly, the power consumption equipment provided by the present application includes the battery pack described above.

[0027] Advantages: the battery pack provided by the embodiments of the present application includes: a box body having an accommodating cavity inside, the box body including a first plate and a second plate oppositely arranged along a first direction, the first plate and the second plate being used to enclose the accommodating cavity; a battery pack arranged in the accommodating cavity, the battery pack including a plurality of single batteries arranged along the first direction; a liquid cooling plate arranged on at least one side of the battery pack along a second direction, the liquid cooling plate including a liquid cooling part and a connecting part; the liquid cooling part being arranged between the first plate and the second plate and in contact with the plurality of single batteries; the connecting part including a main body, a first protruding part and a second protruding part connected with each other, the main body being connected with the liquid cooling part, the first protruding part protruding towards the first plate relative to the liquid cooling part, and the second protruding part protruding towards the second plate relative to the liquid cooling part; the first plate having a first assembly groove, the second plate having a second assembly groove, the first protruding part being embedded in the first assembly groove and the liquid cooling part being attached to the first plate on one side along the first direction, and the second protruding part being embedded in the second assembly groove and the liquid cooling part being attached to the second plate on the other side along the first direction; along the first direction, the liquid cooling plate has a length L mm, the first protruding part and / or the second protruding part has a fourth dimension L4 mm; and the following relationship is satisfied: 0.05≤2L4 / L≤0.17. In the battery pack provided by the embodiments of the present application, the first protruding part and the second protruding part of the liquid cooling plate are respectively embedded in the first assembly groove and the second assembly groove, so that the liquid cooling plate can be stably connected with the box body, thereby the liquid cooling plate forms a structural part of the battery pack, which can make the overall structure of the battery pack more stable, increase the structural strength of the battery pack, improve the protection effect on the single battery, weaken the impact of collision and impact on the single battery, and also meet the space requirement of the expansion of the single battery to a certain extent, thereby improving the safety; and the size parameters of the liquid cooling plate, the first protruding part and the second protruding part satisfy the above relationship, which can fully guarantee the space utilization rate of the battery pack, thereby guaranteeing the balance between the space utilization rate and the structural strength of the battery pack.

[0028] The power consumption equipment provided by the embodiments of the present application includes the battery pack described above, and thus can have all the technical features and technical effects of the battery pack described above, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic diagram of the exploded structure of the battery pack parts according to an embodiment of the present application;

[0031] Figure 2 A schematic diagram of an exploded structure of parts of a battery pack according to an embodiment of the present application from another perspective;

[0032] Figure 3 for Figure 1 Schematic diagram of the local enlarged structure of area A in the middle;

[0033] Figure 4 for Figure 1 Schematic diagram of the local enlarged structure of area B in the middle;

[0034] Figure 5 for Figure 1 Schematic diagram of the local enlarged structure of the middle C area;

[0035] Figure 6 for Figure 2 Schematic diagram of the local enlarged structure of the D area in the middle;

[0036] Figure 7 This is a schematic diagram of the combined structure of the battery pack and the liquid cooling plate in the battery pack of an embodiment of the present application;

[0037] Figure 8 This is a schematic diagram of the main structure of the liquid cooling plate in the battery pack of an embodiment of the present application;

[0038] Figure 9 A schematic side view of the battery pack according to an embodiment of the present application;

[0039] Figure 10 For the Figure 9 Schematic diagram of the cross-sectional structure along the AA line;

[0040] Figure 11 for Figure 10 Schematic diagram of the local enlarged structure of the E area in the middle;

[0041] Figure 12 A top view of the internal structure of a battery pack according to an embodiment of the present application;

[0042] Figure 13 for Figure 12Schematic diagram of the local enlarged structure of the F area in the middle;

[0043] Figure 14 for Figure 12 Schematic diagram of the local enlarged structure of the middle G area;

[0044] Figure markings: 100-box; 110-accommodating chamber; 120-first plate; 121-first assembly groove; 130-second plate; 131-second assembly groove; 140-third plate; 141-third assembly groove; 150-fourth plate; 151-fourth assembly groove; 200-battery pack; 210-single cell; 211-first surface; 300-liquid-cooling plate; 310-liquid-cooling part; 311-main body; 312-bonding part; 320-connecting part; 321-first protrusion; 322-second protrusion; 323-main body. DETAILED DESCRIPTION

[0045] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of this application.

[0046] In the description of this application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application. In the description of this application, "plurality" means two or more, and "at least one" means one, two, or more than two, unless otherwise clearly and specifically defined.

[0047] It should also be noted that in the drawings of the embodiments of this application, the arrow marked X represents the first direction X, the arrow marked Y represents the second direction Y, and the arrow marked Z represents the third direction Z. The description of this application introduces the first direction X, the second direction Y, and the third direction Z to more clearly illustrate the structure and relative positional relationship of the various components in the battery pack. In actual applications, the first direction X, the second direction Y, and the third direction Z can point to any direction in space. Preferably, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0048] Embodiments of the present application provide a battery pack, aiming to solve the technical problem that some structural parts are constantly simplified in the battery pack of the related art, resulting in reduced protection measures for the single batteries in the battery pack and insufficient structural strength of the whole battery pack.

[0049] For a better understanding of the present application, reference will be made to the following embodiments Figures 1 to 14 The battery pack includes a box body 100, a battery pack 200, and a liquid cooling plate 300.

[0050] The box body 100 has an accommodating cavity 110 inside, and the battery pack 200 and the liquid cooling plate 300 are both arranged in the accommodating cavity 110, so as to provide structural support for the battery pack 200 and the liquid cooling plate 300 by the box body 100, guarantee the structural integrity of the whole battery pack and the safety of the battery pack 200, and avoid the single batteries 210 in the battery pack 200 from being affected by external factors such as impact, vibration, and temperature change. In some embodiments, when the battery pack is applied in a new energy vehicle, the box body 100 can also be directly integrated into the chassis or the vehicle body of the vehicle.

[0051] The box body 100 includes a first plate 120 and a second plate 130 oppositely arranged along a first direction X, and the first plate 120 and the second plate 130 are used to enclose the accommodating cavity 110. That is, the accommodating cavity 110 is formed between the first plate 120 and the second plate 130. Among them, the first plate 120 and the second plate 130 can be located at the top and the bottom of the box body 100 respectively, and at this time the first direction X is the vertical direction. For example, the first plate 120 is the top plate of the box body 100, and the second plate 130 is the bottom plate of the box body 100, or the first plate 120 is the bottom plate of the box body 100, and the second plate 130 is the top plate of the box body 100. It should be noted that when the first plate 120 and the second plate 130 are located at the top and the bottom of the box body 100 respectively, the box body 100 further includes a side beam, and a side plate is located between the first plate 120 and the second plate 130 and connected with the first plate 120 and the second plate 130 respectively to enclose the accommodating cavity 110. Alternatively, the first plate 120 and the second plate 130 can also be correspondingly located at the two sides of the box body 100 in the horizontal direction, that is, the first plate 120 and the second plate 130 are the side beams of the box body 100 in the horizontal direction, and the first direction X is the horizontal direction. In this embodiment, the box body 100 further includes a top plate and a bottom plate, and can also include other beams, and these plates are connected with each other to enclose the accommodating cavity 110.

[0052] The battery pack 200 is arranged in the accommodating cavity 110, and the battery pack 200 includes a plurality of single batteries 210, and the plurality of single batteries 210 are arranged along the first direction X. In some embodiments, the accommodating cavity 110 can be provided with a plurality of battery packs 200, and the plurality of battery packs 200 can be arranged along a second direction Y.

[0053] The liquid cooling plate member 300 is arranged at least one side of the battery pack 200 along the second direction Y, and the liquid cooling plate member 300 comprises a liquid cooling part 310 and a connecting part 320 connected with each other; the liquid cooling part 310 is arranged between the first plate member 120 and the second plate member 130, and is in contact with the plurality of single batteries 210, for heat exchange with the single batteries 210 to control the temperature of the battery pack. The connecting part 320 comprises a body 323, a first protruding part 321 and a second protruding part 322 connected with each other, the body 323 is connected with the connecting part 320, the first protruding part 321 protrudes towards the first plate member 120 relative to the liquid cooling part 310, and the second protruding part 322 protrudes towards the second plate member 130 relative to the liquid cooling part 310.

[0054] The first plate member 120 has a first assembly groove 121, the second plate member 130 has a second assembly groove 131, the first protruding part 321 is embedded in the first assembly groove 121, one side of the liquid cooling part 310 along the first direction X is attached to the first plate member 120, the second protruding part 322 is embedded in the second assembly groove 131, and the other side of the liquid cooling part 310 along the first direction X is attached to the second plate member 130. Thus, the liquid cooling plate member 300 can be stably assembled in the accommodating cavity 110 of the box body 100 by being connected with the first plate member 120 and the second plate member 130 respectively.

[0055] Please refer to Figure 8 , along the first direction X, the liquid cooling plate member 300 has a length L mm, the first protruding part 321 and / or the second protruding part 322 has a fourth size L4 mm, and satisfies: 0.05≤2L4 / L≤0.17. Specifically, 2L4 / L can be any value in 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17 or a range value between any two values. Within the range, the larger 2L4 / L is, the more stable the connection structure of the first protruding part 321 and / or the second protruding part 322 with the first plate member 120 and the second plate member 130 is, and the greater the structural strength of the battery pack as a whole is; the smaller 2L4 / L is, the larger the size of the liquid cooling part 310 is, thereby sufficiently ensuring the space utilization rate of the battery pack.

[0056] It can be understood that in the battery pack of the embodiments of the present application, the first protruding part 321 and the second protruding part 322 of the liquid cooling plate 300 are respectively embedded in the first assembly groove 121 and the second assembly groove 131, so that on the one hand, the liquid cooling plate 300 can be stably connected with the box body 100, so that the liquid cooling plate 300 can form a structural part of the battery pack, that is, can provide stability, support and connection for the overall structure, so that the overall structure of the battery pack is more stable, the structural strength of the battery pack is increased, the protection effect on the single battery 210 is improved, and the influence of the impact and the impact on the single battery 210 is weakened. On the second aspect, the size parameters of the liquid cooling plate 300, the first protruding part 321 and the second protruding part 322 satisfy the relationship 0.05≤2L4 / L≤0.17, so that the part cooperating with the first plate 120 and the second plate 130 is relatively small in size with respect to the whole liquid cooling plate 300, thereby occupying a smaller space in the battery pack, thereby ensuring the size of the liquid cooling part 310, thereby fully ensuring the space utilization rate of the battery pack, and further ensuring the balance of the space utilization rate and the structural strength of the battery pack.

[0057] Please refer to Figure 13 In some embodiments, along the second direction Y, the first protruding part 321 has a first size L1 mm, and the first assembly groove 121 has a second size L2 mm, satisfying: 0.5≤L1 / L2≤1. Please refer to Figure 14 In some embodiments, along the second direction Y, the second protruding part 322 has a first size L1 mm, and the second assembly groove 131 has a second size L2 mm, satisfying: 0.5≤L1 / L2≤1. On the one hand, it is convenient for the assembly of the battery pack, and on the other hand, in the embodiment of L1

[0058] Specifically, L1 / L2 can be any value in 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 or a range value between any two values. Within the range, the larger L1 / L2 is, the smaller the activity space of the first protruding part 321 in the first assembly groove 121 and the second protruding part 322 in the second assembly groove 131 is, and the more stable the connection of the liquid cooling plate 300 with the first plate 120 and the second plate 130 is, and the better the effect of improving the structural stability of the battery pack is; the smaller L1 / L2 is, the larger the activity space of the first protruding part 321 in the first assembly groove 121 and the second protruding part 322 in the second assembly groove 131 is, and the less the single battery 210 is pressed by the liquid cooling plate 300 when the single battery 210 expands, thereby improving the safety of the battery pack.

[0059] Please refer to Figure 1 ,Figure 2 、 Figure 4 、 Figure 5 and Figure 6 In some embodiments, the housing 100 includes a third plate 140 and a fourth plate 150 disposed opposite each other along a third direction Z. The first plate 120 and the second plate 130 are disposed between the third plate 140 and the fourth plate 150. The first plate 120, the third plate 140, the second plate 130, and the fourth plate 150 are sequentially connected to form the accommodating cavity 110. For example, when the first plate 120 and the second plate 130 serve as side rails of the housing 100, the third plate 140 and the fourth plate 150 can be the top and bottom plates of the housing 100, respectively, with the third direction Z being the vertical direction. Alternatively, the third plate 140 and the fourth plate 150 can be other side rails of the housing 100. The third plate 140 has a third mounting groove 141, and the fourth plate 150 has a fourth mounting groove 151. The liquid cooling plate 300 is embedded in the third and fourth mounting grooves 141, 151. Thus, the first plate 120 , the second plate 130 , the third plate 140 and the fourth plate 150 can be connected to the liquid cooling plate 300 from four sides of the liquid cooling plate 300 , further improving the connection stability of the structure.

[0060] In addition, especially for the embodiment in which the third plate 140 and the fourth plate 150 are the top plate and the bottom plate of the box body 100, respectively, the liquid cooling plate 300 is embedded in the third plate 140 and the fourth plate 150, which can effectively reduce the space occupied by the liquid cooling plate 300 in the accommodating cavity 110, save space in the vertical direction of the battery pack, and make the arrangement of the single cells 210 more flexible.

[0061] Optionally, in some embodiments, the portion of the liquid cooling plate 300 embedded in the third assembly groove 141 and / or the portion embedded in the fourth assembly groove 151 has a third dimension L3 along the third direction Z, satisfying: <L3≤10mm,也就是说,L3可以为0.5mm、1mm、2mm、3mm、4mm、5mm、6mm、7mm、8mm、9mm、10mm中的任意值或者任意两值之间的范围值。既能够保障液冷板件300与第三板件140、第四板件150的连接稳定性,也能够适当的减少液冷板件300对于电池包竖直方向的空间占用。

[0062] In some embodiments, the battery pack further includes a filling portion (not shown). The filling portion is provided in the third assembly slot 141 and is connected to the third plate 140 and the liquid-cooling plate 300, respectively. Furthermore, the filling portion is provided in the fourth assembly slot 151 and is connected to the fourth plate 150 and the liquid-cooling plate 300, respectively. Providing the filling portion in the third assembly slot 141 and / or the fourth assembly slot 151 can absorb assembly tolerances, enhance the securement of the liquid-cooling plate 300 within the third and fourth assembly slots 141 and 151, and strengthen the connection stability between the liquid-cooling plate 300 and the third and fourth plates 140 and 150, respectively.

[0063] Please also refer to Figure 9 、 Figure 10 and Figure 11 In some embodiments, the connecting portion 320 is connected to a side of the liquid cooling portion 310 close to the third plate 140 ; ​​the connecting portion 320 is embedded in the third assembly groove 141 , and the liquid cooling portion 310 is embedded in the fourth assembly groove 151 .

[0064] In some embodiments, the connecting portion 320 is connected to at least one side of the liquid cooling portion 310 along the third direction Z. Furthermore, one of the liquid cooling portion 310 and the connecting portion 320 has a plug-in connector and the other has a slot. The plug-in connector is disposed within the slot (not shown) to connect the liquid cooling portion 310 and the connecting portion 320. The plug-in connector and the slot cooperate to achieve the connection between the liquid cooling portion 310 and the connecting portion 320, thereby ensuring the structural strength of the liquid cooling plate 300 and, in turn, the overall structural strength of the battery pack.

[0065] In some embodiments, the liquid cooling portion 310 and the connecting portion 320 are an integrated structure, that is, the liquid cooling plate 300 is formed as an integral part, which fully ensures the structural integrity of the liquid cooling plate 300, ensures the structural strength of the liquid cooling plate 300, and further ensures the overall structural strength of the battery pack.

[0066] In some embodiments, the second direction Y corresponds to the thickness direction of the liquid cooling plate 300 , and the thickness of the liquid cooling portion 310 is greater than or equal to the thickness of the connecting portion 320 . This allows the liquid cooling portion 310 to fully fit the single battery 210 , avoiding interference from the connecting portion 320 and ensuring heat dissipation efficiency.

[0067] Please refer again Figure 8 In some embodiments, the first protrusion 321 and / or the second protrusion 322 have a fourth dimension L4 along the first direction X, satisfying the following: 5 mm ≤ L4 ≤ 300 mm. In other words, the value of L4 can be any value among 5, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, or 300, or a range between any two values, and can be changed based on the actual requirements of the battery pack.

[0068] See also Figure 4 In some embodiments, the second direction Y corresponds to the thickness direction of the battery cell 210, and liquid cooling plates 300 are provided on both sides of the battery pack 200 along the second direction Y. In other words, the liquid cooling plates 300 on both sides can contact the large surface (the side with the largest area) of the battery cell 210, thereby increasing the heat dissipation area and improving heat dissipation efficiency.

[0069] Please refer again Figure 11 In some embodiments, the battery cell 210 includes a first surface 211 that contacts the liquid cooling unit 310 , wherein the first surface 211 may be the largest surface of the battery cell 210 . The liquid cooling unit 310 includes a main body 311 and an adhesive portion 312 . The adhesive portion 312 is disposed between the main body 311 and the first surface 211 and is connected to both the main body 311 and the first surface 211 . Along the third direction Z, the adhesive portion 312 has a fifth dimension L5 mm, and the first surface 211 has a sixth dimension L6 mm, satisfying the following: 0.5 ≤ L5 / L6 ≤ 1.5. In other words, L5 / L6 can be any value among 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, and 1.5, or a range between any two values. Controlling L5 / L6 within this range ensures the connection strength between the liquid cooling unit 310 and the first surface 211, while also ensuring thermal conductivity and heat dissipation performance.

[0070] In some embodiments, the shear strength of the liquid cooling plate 300 material is σ, the shear area at the connection between the liquid cooling plate 300 and the box body 100 is S1, and the shear force at the connection between the liquid cooling plate 300 and the box body 100 is F1, wherein S1 includes at least one of the following: the cross-sectional area of ​​the first protrusion 321, the cross-sectional area of ​​the second protrusion 322, the cross-sectional area of ​​the portion of the liquid cooling plate 300 embedded in the third assembly groove 141, and the cross-sectional area of ​​the portion of the liquid cooling plate 300 embedded in the third assembly groove 141.

[0071] Comparing the embodiment of the present application with the related technology of connecting the liquid cooling plate and the box by welding, S2: the welding area of ​​a single liquid cooling plate, F2: the shear force at the welding point of a single liquid cooling plate. Shear force = shear area * shear strength. Currently, the welding strength can reach up to 80% of the parent material strength, including the heat-affected zone caused by welding. The shear force in the embodiment of the present application is F1 = S1 * σ, and the shear force of the liquid cooling plate by the traditional welding method is F2 = S2 * σ * 0.8. It can be seen that under the same area (S1> S2), the shear force F1 of the embodiment of the present application is greater than the shear force F2 of the welding method.

[0072] It should be noted that L, L1, L2, L3, L4, L5, and L6 are all measured using conventional dimensional measuring tools such as vernier calipers and micrometers.

[0073] Next, several examples and comparative examples are provided to illustrate the effectiveness of the battery pack of the present application. The space utilization of the battery pack is equal to the volume of the battery pack 200 divided by the volume of the internal accommodating cavity 110 of the battery box. The vibration test was conducted based on the vibration test at the battery pack level in 8.2.1 of the national standard GB38031-2020. Detailed test data is shown in the table below:

[0074]

[0075] As shown in the table above, when 2L4 / L is above 0.175, the battery pack space utilization is low, and as 2L4 / L continues to increase, the battery pack space utilization decreases significantly. When 2L4 / L is 0.04, the battery pack fails the vibration test, indicating that the structural strength of the entire pack is insufficient. The battery pack of the embodiment of the present application satisfies the relationship of 0.05≤2L4 / L≤0.17, resulting in a higher space utilization and better structural strength.

[0076] Accordingly, an embodiment of the present application provides an electrical device, which may be various types of equipment such as new energy vehicles, computers, energy storage and power supply devices, etc. It can be understood that the electrical device may include all the technical features and beneficial effects of the above-mentioned battery pack or the above-mentioned single cell, which will not be repeated here.

[0077] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0078] The above is a detailed introduction to the battery pack and electrical equipment provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: Having a first direction (X) and a second direction (Y) intersecting each other, the battery pack includes: A box (100) having a receiving cavity (110) therein, the box (100) comprising a first plate (120) and a second plate (130) arranged opposite to each other along the first direction (X), the first plate (120) and the second plate (130) being used to enclose the receiving cavity (110); A battery pack (200) is disposed in the accommodating cavity (110), the battery pack (200) comprising a plurality of single cells (210) arranged along the first direction (X), the single cells (210) being located between the first plate (120) and the second plate (130); A liquid cooling plate (300) is provided on at least one side of the battery pack (200) along the second direction (Y), the liquid cooling plate (300) comprising a liquid cooling portion (310) and a connecting portion (320); the liquid cooling portion (310) is provided between the first plate (120) and the second plate (130), and is in contact with the plurality of single batteries (210); the connecting portion (320) comprises a main body (323), a first protrusion (321), and a second protrusion (322) connected to each other; the main body (323) is connected to the liquid cooling portion (310), the first protrusion (321) protrudes relative to the liquid cooling portion (310) toward the first plate (120), and the second protrusion (322) protrudes relative to the liquid cooling portion (310) toward the second plate (130); The first plate (120) has a first assembly groove (121), the second plate (130) has a second assembly groove (131), the first protrusion (321) is embedded in the first assembly groove (121), and the liquid cooling part (310) is in contact with the first plate (120) along one side of the first direction (X), the second protrusion (322) is embedded in the second assembly groove (131), and the liquid cooling part (310) is in contact with the second plate (130) along the other side of the first direction (X); Along the first direction (X), the liquid cooling plate (300) has a length dimension of L mm, and the first convex portion (321) and / or the second convex portion (322) has a fourth dimension of L4 mm; Meets: 0.05≤2L4 / L≤0.

17.

2. The battery pack according to claim 1, wherein: The battery pack further has a third direction (Z), and the third direction (Z) intersects with the first direction (X) and the second direction (Y); The box body (100) includes a third plate (140) and a fourth plate (150) arranged relative to each other along the third direction (Z), the first plate (120) and the second plate (130) are arranged between the third plate (140) and the fourth plate (150), and the first plate (120), the third plate (140), the second plate (130) and the fourth plate (150) are sequentially connected and arranged to form the accommodating cavity (110); The third plate (140) has a third assembly groove (141), the fourth plate (150) has a fourth assembly groove (151), and the liquid cooling plate (300) is embedded in the third assembly groove (141) and the fourth assembly groove (151).

3. The battery pack according to claim 2, wherein: The portion of the liquid cooling plate (300) embedded in the third assembly groove (141) and / or the portion embedded in the fourth assembly groove (151) has a third dimension L3 along the third direction (Z), satisfying: <L3≤10mm。 4. The battery pack according to claim 2, wherein: The battery pack further includes a filling portion; The filling portion is provided in the third assembly groove (141), and the filling portion is connected to the third plate (140) and the liquid cooling plate (300) respectively; and / or the filling portion is provided in the fourth assembly groove (151), and the filling portion is connected to the fourth plate (150) and the liquid cooling plate (300) respectively.

5. The battery pack according to claim 2, wherein: The connecting portion (320) is connected to a side of the liquid cooling portion (310) close to the third plate (140); the connecting portion (320) is embedded in the third assembly groove (141), and the liquid cooling portion (310) is embedded in the fourth assembly groove (151).

6. The battery pack according to claim 1, wherein: The battery pack further has a third direction (Z), and the third direction (Z) intersects with the first direction (X) and the second direction (Y); the connecting portion (320) is connected to at least one side of the liquid cooling portion (310) along the third direction (Z); One of the liquid cooling part (310) and the connecting part (320) is provided with a plug-in part, and the other is provided with a slot. The plug-in part is arranged in the slot to connect the liquid cooling part (310) and the connecting part (320).

7. The battery pack according to claim 1, wherein: The second direction (Y) corresponds to the thickness direction of the liquid cooling plate (300), and the thickness of the liquid cooling portion (310) is greater than or equal to the thickness of the connecting portion (320).

8. The battery pack according to claim 1, wherein: The liquid cooling part (310) and the connecting part (320) are an integrated structure.

9. The battery pack according to claim 1, wherein: The battery pack satisfies: 5mm≤L4≤300mm.

10. The battery pack according to claim 1, wherein: The second direction (Y) corresponds to the thickness direction of the single battery (210), and the battery pack (200) is provided with the liquid cooling plate (300) on both sides along the second direction (Y).

11. The battery pack according to claim 1 or 10, characterized in that: The single battery (210) includes a first surface (211) in contact with the liquid cooling portion (310), and the liquid cooling portion (310) includes: Main body (311); The bonding portion (312) is disposed between the main body portion (311) and the first surface (211), and is connected to the main body portion (311) and the first surface (211) respectively.

12. An electrical device, characterized in that: The invention comprises the battery pack according to any one of claims 1 to 11.

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