Battery pack

Abstract

Embodiments of the present disclosure provide a battery pack including a battery module, a liquid cooling plate, an insulation layer, and a thermally conductive adhesive. The battery module includes a plurality of battery cells. The liquid cooling plate has a first side facing the plurality of battery cells. The insulation layer is disposed on the first side of the liquid cooling plate and has a recessed portion disposed on a side of the insulation layer facing away from the liquid cooling plate. The thermally conductive adhesive bonds the plurality of battery cells to the insulation layer and partially fills within the recessed portion.

Description

Technical Field

[0001] The embodiments disclosed herein relate generally to the field of power battery technology, and more specifically, to battery packs. Background Technology

[0002] With the continuous development of new energy vehicles, the requirements for battery charge / discharge rate, service life, and safety are gradually increasing.

[0003] Batteries generate heat during charging and discharging. Liquid cooling plates help control the battery temperature, thus ensuring the battery pack's lifespan. Simultaneously, to meet the insulation and mechanical strength requirements of the liquid cooling plate, an insulating coating needs to be applied to its outer surface. However, this insulating coating directly affects the heat exchange efficiency and bonding strength between the liquid cooling plate and the thermally conductive adhesive. Utility Model Content

[0004] In one aspect of this disclosure, a battery pack is provided, comprising a battery module, a liquid cooling plate, an insulating layer, and thermally conductive adhesive. The battery module includes a plurality of battery cells. The liquid cooling plate has a first side facing the plurality of battery cells. The insulating layer is disposed on the first side of the liquid cooling plate and has a recess on a side of the insulating layer opposite to the liquid cooling plate. The thermally conductive adhesive bonds the plurality of battery cells to the insulating layer and partially fills the recess.

[0005] According to embodiments of this disclosure, the recesses on the insulating layer increase the contact area between the insulating layer and the thermally conductive adhesive, thereby improving the bonding strength between the liquid cooling plate, the insulating layer, and the thermally conductive adhesive, and ultimately enhancing the overall bonding strength of the battery pack. Furthermore, the relatively small distance between the thermally conductive adhesive and the liquid cooling plate within the recesses facilitates heat transfer, thereby improving the heat exchange efficiency between the liquid cooling plate and the thermally conductive adhesive, and consequently, the heat exchange efficiency between the battery module and the liquid cooling plate. Therefore, the battery pack according to embodiments of this disclosure effectively improves the mechanical strength and thermal conductivity between the liquid cooling plate and the thermally conductive adhesive.

[0006] In some embodiments, a plurality of battery cells are arranged in a plurality of rows and a plurality of columns, with each row of battery cells arranged along a first direction and each column of battery cells arranged along a second direction perpendicular to the first direction; and the recess has a plurality of first grooves, the plurality of first grooves being arranged at intervals from each other along the first direction, at least a portion of the plurality of first grooves extending from one side of the insulating layer to the opposite side along the second direction, and each first groove corresponding to at least one column of battery cells along the first direction.

[0007] In some embodiments, where each of the first grooves corresponds to a row of battery cells, the size of the first groove is D1 and the size of the battery cell is D2 along the first direction, satisfying: D1 < D2.

[0008] In some embodiments, where each of the first grooves corresponds to at least two columns of the battery cells, the size of the first groove is D3 along the first direction, and the size of the at least two columns of the battery cells is D4, satisfying: D3 < D4.

[0009] In some embodiments, a plurality of battery cells are arranged in a plurality of rows and a plurality of columns, each row of battery cells is arranged along a first direction, and each column of battery cells is arranged along a second direction perpendicular to the first direction; and the recess has a plurality of second grooves, the plurality of second grooves being arranged at intervals from each other along the first direction, the insulating layer including a plurality of surrounding portions, each second groove being formed by a corresponding surrounding portion in both the first and second directions, and along the first direction, each second groove corresponding to at least two columns of battery cells.

[0010] In some embodiments, the plurality of battery cells are arranged in a plurality of rows and a plurality of columns, with each row of battery cells arranged along a first direction and each column of battery cells arranged along a second direction perpendicular to the first direction; and the recess has a plurality of third grooves, the plurality of third grooves being arranged in a plurality of rows and a plurality of columns, with each row of third grooves arranged along the first direction and each column of third grooves arranged along the second direction, and each battery cell corresponding to at least one third groove along the first direction.

[0011] In some embodiments, when the recess has a plurality of second grooves, each second groove has a cross-section along the plane defined by the first direction and the second direction that is at least one of a rectangle, a circle, a triangle, a rhombus, or a hexagon; and when the recess has the plurality of third grooves, each third groove has a cross-section along the plane defined by the first direction and the second direction that is at least one of a circle, a rectangle, a triangle, a rhombus, or a hexagon.

[0012] In some embodiments, the insulating layer includes a contact surface facing the battery module, and the recessed portion is recessed from the contact surface in a direction away from the battery module; and the battery module further has a plurality of gaps disposed between adjacent rows of battery cells, and along the first direction, the contact surface corresponds to at least one of the plurality of gaps.

[0013] In some embodiments, the first groove, the second groove, and the third groove each have a groove bottom and a groove opening. The groove opening is located on the side of the groove bottom near the battery module. Along the first direction, the size of the groove bottom is D5, and the size of the groove opening is D6, satisfying that D5 < D6.

[0014] In some embodiments, the distance between the bottom of the tank and the first side of the liquid cooling plate gradually decreases from the edge of the bottom of the tank towards the center of the bottom of the tank; and the contact surface has a connecting portion located along the first direction between adjacent first grooves, adjacent second grooves, and adjacent third grooves, the connecting portion protruding in a direction away from the first side of the liquid cooling plate, and the distance between the connecting portion and the first side of the liquid cooling plate gradually increases from the edge of the connecting portion towards the center of the connecting portion.

[0015] It should be understood that the description in this section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0016] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0017] Figure 1 A schematic diagram of the structure of a battery pack according to some embodiments of the present disclosure is shown;

[0018] Figure 2 A partial structural schematic diagram of an insulating layer according to some embodiments of the present disclosure is shown;

[0019] Figures 3 to 7 It shows including Figure 2 A partial cross-sectional view of the battery pack showing the insulating layer;

[0020] Figure 8 A partial structural schematic diagram of an insulating layer according to some other embodiments of the present disclosure is shown;

[0021] Figure 9 It shows including Figure 8 A partial cross-sectional view of the battery pack showing the insulating layer;

[0022] Figure 10 A partial structural schematic diagram of an insulating layer according to some other embodiments of the present disclosure is shown.

[0023] Explanation of reference numerals in the attached figures:

[0024] 100 represents the battery pack, and 101 represents the gap.

[0025] 1 represents the battery module, and 11 represents the individual battery cells;

[0026] 2 is the liquid cooling plate, 21 is the first side, 22 is the second side, 23 is the flow channel, and 24 is the reinforcement part;

[0027] 3 is the insulating layer, 31 is the recessed part, 3111 is the first groove, 3112 is the second groove, 3113 is the third groove, 312 is the bottom of the groove, 3121 is the first part, 3122 is the second part, 313 is the groove opening, 32 is the surrounding part, 33 is the contact surface, 331 is the connecting part, 3311 is the third part, and 3312 is the fourth part;

[0028] 4 is thermally conductive adhesive; 5 is the enclosure panel; 6 is the reinforcing plate;

[0029] X is the first direction; Y is the second direction. Detailed Implementation

[0030] Embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0031] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0032] As described above, the insulating coating directly affects the heat exchange efficiency and bonding strength between the liquid cooling plate and the thermally conductive adhesive. Embodiments of this disclosure provide a battery pack to at least partially address the aforementioned problems. In the following sections, [further details will be provided]. Figures 1 to 10 The principles of this disclosure are described.

[0033] Figure 1 A schematic diagram of the structure of a battery pack 100 according to some embodiments of the present disclosure is shown. Figure 2 A partial structural schematic diagram of the insulating layer 3 according to some embodiments of the present disclosure is shown; only a portion of the structure of the insulating layer 3 is shown. Figures 3 to 7 It shows including Figure 2 A partial cross-sectional view of the battery pack 100 with insulating layer 3 shown. Figures 1 to 7 As shown, the battery pack 100 described herein includes a battery module 1, a liquid cooling plate 2, an insulating layer 3, and thermally conductive adhesive 4.

[0034] refer to Figure 1 In some embodiments, the battery module 1 includes a plurality of battery cells 11. The plurality of battery cells 11 can be arranged in multiple rows and multiple columns. Each row of battery cells 11 can be arranged along a first direction X, and each column of battery cells 11 can be arranged along a second direction Y. The second direction Y can be perpendicular to the first direction X.

[0035] refer to Figures 1 to 3 In some embodiments, the liquid cooling plate 2 has a first side 21 facing the plurality of battery cells 11 and a second side 22 facing away from the plurality of battery cells 11. The first side 21 may be disposed opposite to the second side 22. The insulating layer 3 is adapted to ensure the insulation performance of the battery pack 100. In addition, the insulating layer 3 is adapted to ensure the long-term durability of the liquid cooling plate 2 under harsh conditions such as high and low temperatures, high humidity, and coolant leakage. The insulating layer 3 is disposed at least on the first side 21 of the liquid cooling plate 2, and the portion of the insulating layer 3 on the first side 21 has a recess 31. The recess 31 is disposed on the side of the insulating layer 3 facing away from the liquid cooling plate 2, that is, the recess 31 may be disposed adjacent to the battery module 1.

[0036] refer to Figures 1 to 3 In some embodiments, thermally conductive adhesive 4 may be provided between the plurality of battery cells 11 and the insulating layer 3. Therefore, the thermally conductive adhesive 4 is suitable for bonding the plurality of battery cells 11 to the insulating layer 3 to fix the battery module 1 onto the liquid cooling plate 2, and is also suitable for regulating the temperature of the battery module 1. The thermally conductive adhesive 4 is also partially filled within the recess 31 to increase the contact area between the insulating layer 3 and the thermally conductive adhesive 4. Furthermore, since the insulating layer 3 is provided at least on the first side 21 of the liquid cooling plate 2, the bonding strength of the liquid cooling plate 2, the insulating layer 3, and the thermally conductive adhesive 4 is improved. Furthermore, since the thermally conductive adhesive 4 is bonded to the plurality of battery cells 11, the bonding strength of the liquid cooling plate 2, the insulating layer 3, the thermally conductive adhesive 4, and the battery module 1 is improved, thereby improving the overall bonding strength of the battery pack 100. The surrounding plate 5 may wrap around the side of the battery module 1. In this way, the surrounding plate 5, the liquid cooling plate 2, the insulating layer 3, the thermally conductive adhesive 4, and the battery module 1 constitute an integral structure.

[0037] According to the embodiment of the present disclosure, the recessed portion 31 on the insulating layer 3 is advantageous for increasing the contact area between the insulating layer 3 and the thermally conductive adhesive 4, thereby improving the bonding firmness of the liquid cooling plate 2, the insulating layer 3 and the thermally conductive adhesive 4, and further improving the overall bonding degree of the battery pack 100. In addition, the distance between the thermally conductive adhesive 4 located in the recessed portion 31 and the liquid cooling plate 2 is relatively small, which facilitates heat transfer, thereby improving the heat exchange efficiency between the liquid cooling plate 2 and the thermally conductive adhesive 4, and further improving the heat exchange efficiency between the battery module 1 and the liquid cooling plate 2. Therefore, the battery pack 100 according to the embodiment of the present disclosure effectively improves the mechanical strength and thermal conductivity efficiency between the liquid cooling plate 2 and the thermally conductive adhesive 4.

[0038] Back to Reference Figure 2 , In some embodiments, the insulating layer 3 can be formed by uniformly spraying UV glue (ultraviolet curable glue) on the surface of the liquid cooling plate 2 by jet printing technology, and then curing via ultraviolet irradiation. The viscosity of the UV glue can be 10-100cps, and the spraying is realized through a printing nozzle. During the spraying process, the working distance between the printing nozzle and the workpiece can be 3-10mm, and the UV glue is vertically ejected through numerous nozzles and falls on the surface of the workpiece. With this jet printing method, the thickness consistency of the coating is improved, and the thickness error can reach ±10μm, which is obviously superior to electrostatic spraying and spray gun spraying methods, and significantly improves the utilization rate of materials. In addition, it also helps to avoid the problem of uneven thickness of the thermally conductive adhesive 4. During the spraying process, the glue output of local nozzles can be individually controlled, so as to obtain insulating layers 3 with different thicknesses and different shapes.

[0039] For example, the insulating layer 3 includes a first insulating portion corresponding to the recessed portion 31, the thickness of the first insulating portion is H1. The insulating layer 3 further includes a second insulating portion excluding the first insulating portion, the thickness of the second insulating portion is H2, which satisfies: 30μm ≤ H1 < H2 ≤ 200um. The thermally conductive adhesive 4 is arranged on the insulating layer 3, and the thickness of the thermally conductive adhesive 4 is controlled by the thickness H3 of the adhesive limiting strip, that is, the thickness of the thermally conductive adhesive 4 is H3, which satisfies: 300μm ≤ H3 ≤ 800um.

[0040] It should be noted that the numbers, numerical values, quantities and the like mentioned above and elsewhere in the present disclosure are all exemplary, and are not intended to limit the scope of the present disclosure in any way. Any other suitable numbers, numerical values, and quantities are possible.

[0041] In some embodiments, when 7% ≤ (H1 - H2) / (H3 - H1) ≤ 33% is satisfied, the shear strength and heat transfer effect between the liquid cooling plate 2 and the thermally conductive adhesive 4 are improved.

[0042] In some embodiments, the surface area of ​​the portion of the insulating layer 3 corresponding to the recess 31 (the first insulating portion) is S1, and the surface area of ​​the adhesive-coated surface in the battery module 1 is S2. When 55% ≤ S1 / S2 ≤ 90%, the thermal diffusion efficiency between the liquid cooling plate 2 and the thermally conductive adhesive 4 is effectively improved. For example, S1 / S2 can be any one of 60%, 65%, 70%, 75%, 80%, or 85%, or a range between any two of these values.

[0043] Continue to refer to Figure 2 In some embodiments, the recess 31 may have a plurality of first grooves 3111. The plurality of first grooves 3111 are arranged at intervals along a first direction X, and each first groove 3111 extends along a second direction Y. At least a portion of the plurality of first grooves 3111 extends along the second direction Y from one side of the insulating layer 3 to the opposite side. That is, the first groove 3111 may be an elongated structure. Along the first direction X, each first groove 3111 corresponds to at least one row of battery cells 11.

[0044] It is understood that by setting the first groove 3111 to correspond to at least one row of battery cells 11, and filling the first groove 3111 with thermally conductive adhesive 4, the thickness of the thermally conductive adhesive 4 between each row of battery cells 11 and the liquid cooling plate 2 is thicker, and the distance between the thermally conductive adhesive 4 between each row of battery cells 11 and the liquid cooling plate 2 is closer, which is beneficial for heat transfer and thus improves the heat exchange efficiency between the battery module 1 and the liquid cooling plate 2. In addition, the first groove 3111 is adapted to accommodate the thermally conductive adhesive 4, preventing the thermally conductive adhesive 4 from overflowing into the gap 101 between the battery cells 11, thereby avoiding waste of the thermally conductive adhesive 4.

[0045] refer to Figure 3 and Figure 4 In some embodiments, where each first groove 3111 corresponds to a row of battery cells 11, along the first direction X, the size of the first groove 3111 is D1, and the size of the battery cell 11 is D2, satisfying that D1 < D2. The heat in the middle region of the battery cell 11 is relatively high, while the heat in the side regions is relatively low, thereby facilitating the transfer of heat from the battery cell 11 to the liquid cooling plate 2, thereby improving heat exchange efficiency.

[0046] refer to Figure 5 In some embodiments, where each first groove 3111 corresponds to at least two rows of battery cells 11, the size of the first groove 3111 along the first direction X is D3, and the size of the at least two rows of battery cells 11 is D4, satisfying that D3 < D4. In this way, it is convenient for the heat of the battery cells 11 to be transferred to the liquid cooling plate 2, thereby improving the heat exchange efficiency.

[0047] It should be noted that, along the first direction X, dimension D4 refers to the distance between the opposite sides of one outermost row of battery cells 11 and another outermost row of battery cells 11. For example, continuing to refer to... Figure 5 In the case where there is a gap 101 between adjacent battery cells 11 in at least two rows of battery cells 11, dimension D4 refers to the sum of the width of each row of battery cells 11 in the first direction X and the width of at least one gap 101.

[0048] Return to reference Figures 2 to 7 In some embodiments, the insulating layer 3 may further include a contact surface 33 facing the battery module 1. The recess 31 may be recessed from the contact surface 33 in a direction away from the battery module 1. (Continue referring to...) Figure 2 and Figure 3 Since the first groove 3111 can extend from one side of the insulating layer 3 to the opposite side along the second direction Y, the contact surface 33 can be divided into multiple portions, each of which is elongated. The battery module 1 may also have multiple gaps 101 disposed between adjacent rows of battery cells 11. Along the first direction X, the contact surface 33 may correspond to at least one of the multiple gaps 101, and may also correspond to the regions on both sides of the battery cell 11 along the first direction X. Since the heat at adjacent gaps 101 is relatively low, the impact on heat exchange efficiency can be minimized while ensuring bonding strength.

[0049] refer to Figure 3 Furthermore, in addition to corresponding to the two sides of the gap 101 and the battery cell 11, the contact surface 33 can also correspond to the middle area of ​​the battery cell 11.

[0050] refer to Figure 6 In some embodiments, each first groove 3111 has a groove bottom 312 and a groove opening 313. The groove opening 313 may be located on the side of the groove bottom 312 closer to the battery module 1. Along the first direction X, the dimension of the groove bottom 312 is D5, and the dimension of the groove opening 313 is D6, satisfying: D5 < D6. In this way, it is beneficial for the thermally conductive adhesive 4 to flow into the interior of the first groove 3111, preventing the phenomenon of insufficient adhesive in the transition area. On the one hand, it can increase the contact area between the thermally conductive adhesive 4 and the insulating layer 3, thereby improving the firmness of the bond between the liquid cooling plate 2, the insulating layer 3, and the thermally conductive adhesive 4. On the other hand, it is also beneficial for heat transfer.

[0051] For example, refer to Figure 6 In some embodiments, the groove wall of the first groove 3111 may include at least one of an inclined plane and an arcuate surface, satisfying that D5 < D6. (See reference...) Figures 3 to 5In some other embodiments, the groove wall of the first groove 3111 may also include a vertical surface, which is perpendicular to the groove bottom 312, in which case D5 = D6 is satisfied.

[0052] refer to Figure 7 In some embodiments, the distance between the bottom of the tank 312 and the first side 21 of the liquid cooling plate 2 gradually decreases from the edge of the bottom of the tank 312 towards the center of the bottom of the tank 312. That is, the first insulating portion in the insulating layer 3 is designed with non-uniform height. In this way, the insulating layer 3 is thinnest in the middle region corresponding to the relatively high heat of the battery cell 11, and the corresponding thermally conductive adhesive 4 is thickest and closer to the liquid cooling plate 2, which is beneficial for heat transfer and thus improves heat exchange efficiency. In addition, the insulating layer 3 is thickest in the two side regions corresponding to the relatively low heat of the battery cell 11, so as to improve the structural strength of the insulating layer 3 and the firmness of the bond between the liquid cooling plate 2, the insulating layer 3 and the thermally conductive adhesive 4. Figures 3 to 6 In other embodiments, the distance between the bottom of the tank 312 and the first side 21 of the liquid cooling plate 2 is equal from the edge of the bottom of the tank 312 to the center of the bottom of the tank 312. That is, the first insulating part can be designed with equal height.

[0053] refer to Figure 7 In some embodiments, the bottom of the groove 312 includes a first portion 3121 and a second portion 3122 located on both sides of the first portion 3121. The first portion 3121 includes the middle of the bottom of the groove 312. The second portion 3122 includes the edge of the bottom of the groove 312. The distance between the first portion 3121 and the first side 21 may be smaller than the distance between the second portion 3122 and the first side 21.

[0054] Continue to refer to Figure 2 and Figure 7 In some embodiments, the contact surface 33 has a connecting portion 331 located between adjacent first grooves 3111 along the first direction X. Figure 2 In this design, since the first groove 3111 extends from one side of the insulating layer 3 to the opposite side along the second direction Y, the contact surface 33 only includes a plurality of spaced connecting portions 331. The connecting portions 331 can protrude along the direction away from the first side 21 of the liquid cooling plate 2. From the edge of the connecting portion 331 towards the center of the connecting portion 331, the distance between the connecting portion 331 and the first side 21 of the liquid cooling plate 2 gradually increases. That is, the second insulating portion is designed with non-uniform height. This approach helps to improve the structural strength of the insulating layer 3 and the bonding strength between the liquid cooling plate 2, the insulating layer 3, and the thermally conductive adhesive 4. (Return to Reference) Figures 3 to 5 In other embodiments, the distance between the connecting portion 331 and the first side 21 of the liquid cooling plate 2 is equal from the edge of the connecting portion 331 to the middle of the connecting portion 331. That is, the second insulating portion is designed with equal height.

[0055] refer to Figures 2 to 7 Furthermore, each connection 331 may correspond to at least one of the plurality of gaps 101. Since the heat at the adjacent gaps 101 is relatively low, the impact on heat exchange efficiency can be minimized while ensuring the bonding strength.

[0056] refer to Figure 7 In some embodiments, the connecting portion 331 may include a third portion 3311 and fourth portions 3312 located on both sides of the third portion 3311. The third portion 3311 includes the middle portion of the connecting portion 331. The fourth portion 3312 includes the edge of the connecting portion 331. The distance between the third portion 3311 and the first side 21 may be greater than the distance between the fourth portion 3312 and the first side 21.

[0057] Continue to refer to Figure 3 In some embodiments, the liquid cooling plate 2 has flow channels 23 inside for the flow of coolant. The liquid cooling plate 2 may include multiple reinforcing parts 24, each reinforcing part 24 being disposed at a corresponding flow channel 23 to improve the structural strength of the liquid cooling plate 2.

[0058] Figure 8 A partial structural schematic diagram of the insulating layer 3 according to some other embodiments of the present disclosure is shown; only a portion of the structure of the insulating layer 3 is shown. Figure 9 It shows including Figure 8 A partial cross-sectional view of the battery pack 100 with insulating layer 3 shown. Figure 8 and Figure 9 The insulating layer 3 shown is Figures 1 to 7 The insulating layer 3 shown has a similar structure, the main difference being the structure of the recess 31 and its correspondence with the battery cell 11. Furthermore, due to the different structures of the recess 31, the structure of the thermally conductive adhesive 4 is also different. The following text will primarily describe the differences between the two, while the identical parts will not be repeated.

[0059] like Figure 8 As shown, in some embodiments, the recess 31 has a plurality of second grooves 3112. The second grooves 3112 are arranged at intervals along a first direction X. The insulating layer 3 may include a plurality of surrounding portions 32, each second groove 3112 being formed by being surrounded by a corresponding surrounding portion 32 in the first direction X and the second direction Y. That is, unlike the first groove 3111, the second groove 3112 does not extend to the edge of the insulating layer 3, but extends to the edge adjacent to the insulating layer 3 so as to be surrounded by the surrounding portion 32.

[0060] refer to Figure 8 and Figure 9In some embodiments, along the first direction X, each second groove 3112 corresponds to at least two rows of battery cells 11. In this way, by arranging the second groove 3112 to correspond to at least two rows of battery cells 11, and with the thermally conductive adhesive 4 filled in the second groove 3112, the thickness of the thermally conductive adhesive 4 between each row of battery cells 11 and the liquid cooling plate 2 is thicker, and the distance between the thermally conductive adhesive 4 and the liquid cooling plate 2 is closer, thereby facilitating heat transfer and improving the heat exchange efficiency between the battery module 1 and the liquid cooling plate 2. Furthermore, the second groove 3112 is adapted to accommodate the thermally conductive adhesive 4, preventing the thermally conductive adhesive 4 from overflowing into the gap 101 between the battery cells 11, thereby avoiding waste of the thermally conductive adhesive 4.

[0061] refer to Figure 8 and Figure 9 In some embodiments, each second groove 3112 has a cross-section along a plane defined by a first direction X and a second direction Y that is at least one of a rectangle, a circle, a triangle, a rhombus, or a hexagon.

[0062] Similar to the first groove 3111, each second groove 3112 has a groove bottom 312 and a groove opening 313. The groove opening 313 can be located on the side of the groove bottom 312 closer to the battery module 1. Along the first direction X, the dimension of the groove bottom 312 is D5, and the dimension of the groove opening 313 is D6, satisfying: D5 < D6. Similarly, when the second groove 3112 corresponds to at least two rows of battery cells 11, along the first direction X, the dimension of the second groove 3112 is D3, and the dimension of the at least two rows of battery cells 11 is D4, satisfying: D3 < D4.

[0063] Continue to refer to Figure 8 and Figure 9 In some embodiments, since each second groove 3112 is surrounded by a corresponding surrounding portion 32 in the first direction X and the second direction Y, the contact surface 33, in addition to having the surface of the connecting portion 331 between adjacent second grooves 3112, also has a surface in the surrounding portion 32 excluding the connecting portion 331. Similarly, from the edge of the groove bottom 312 towards the center of the groove bottom 312, the distance between the groove bottom 312 and the first side 21 of the liquid cooling plate 2 gradually decreases. That is, the first insulating portion can be non-uniform in height, but it can also be uniform in height. Furthermore, the connecting portion 331 protrudes in a direction away from the first side 21 of the liquid cooling plate 2, and from the edge of the connecting portion 331 towards the center of the connecting portion 331, the distance between the connecting portion 331 and the first side 21 of the liquid cooling plate 2 gradually increases. That is, the second insulating portion can be non-uniform in height, but it can also be uniform in height.

[0064] refer to Figure 8 and Figure 9Furthermore, each connection portion 331 may correspond to at least one of the plurality of gaps 101. Since the heat is relatively low near the gaps 101, the impact on heat exchange efficiency can be minimized while ensuring bonding strength. In addition, to improve the mounting stability of the battery module 1, a reinforcing plate 6 may be provided at the corresponding position of each connection portion 331. The reinforcing plate 6 may be connected to the surrounding plate 5 and located within the gap 101.

[0065] Figure 10 A partial structural schematic diagram of the insulating layer 3 according to some other embodiments of the present disclosure is shown. Figure 10 The insulating layer 3 shown is Figures 1 to 7 The insulating layer 3 shown has a similar structure, the main difference being the structure of the recess 31 and its correspondence with the battery cell 11. Furthermore, due to the different structures of the recess 31, the structure of the thermally conductive adhesive 4 is also different. The following text will primarily describe the differences between the two, while the identical parts will not be repeated.

[0066] like Figure 10 As shown, in some embodiments, the recess 31 has a plurality of third grooves 3113, which are arranged in a matrix on the insulating layer 3. The plurality of third grooves 3113 are arranged in multiple rows and multiple columns, with each row of third grooves 3113 arranged along a first direction X and each column of third grooves 3113 arranged along a second direction Y.

[0067] In some embodiments, reference Figure 10 Multiple third grooves 3113 may be arranged in parallel on the insulating layer 3. That is, one third groove 3113 in a column of third grooves 3113 is aligned with the corresponding third grooves 3113 in other columns along the second direction Y. In other embodiments, multiple third grooves 3113 may be arranged in a staggered manner on the insulating layer 3. That is, one third groove 3113 in a column of third grooves 3113 is located between adjacent third grooves 3113 in adjacent columns.

[0068] refer to Figure 10In some embodiments, each battery cell 11 corresponds to at least one third groove 3113 along the first direction X. In this way, by assigning each battery cell 11 to at least one third groove 3113, and filling the third groove 3113 with thermally conductive adhesive 4, the thickness of the thermally conductive adhesive 4 between each battery cell 11 and the liquid cooling plate 2 is thicker, and the distance between the thermally conductive adhesive 4 and the liquid cooling plate 2 is closer, thereby facilitating heat transfer and improving the heat exchange efficiency between the battery module 1 and the liquid cooling plate 2. Furthermore, the third groove 3113 is adapted to accommodate the thermally conductive adhesive 4, preventing it from overflowing into the gap 101 between the battery cells 11, thus solving the problem of wasting thermally conductive adhesive 4. In addition, it helps to reduce the assembly and positioning requirements between the battery module 1 and the liquid cooling plate 2.

[0069] refer to Figure 10 In some embodiments, each third groove 3113 has a cross-section along the plane defined by the first direction X and the second direction Y that is at least one of a circle, a rectangle, a triangle, a rhombus or a hexagon.

[0070] Similar to the first groove 3111, each third groove 3113 has a groove bottom 312 and a groove opening 313. The groove opening 313 can be located on the side of the groove bottom 312 closer to the battery module 1. Along the first direction X, the dimension of the groove bottom 312 is D5, and the dimension of the groove opening 313 is D6, satisfying: D5 < D6.

[0071] refer to Figure 10 In some embodiments, the distance between the bottom of the groove 312 and the first side 21 of the liquid cooling plate 2 gradually decreases from the edge of the groove 312 towards the center of the groove 312. That is, the first insulating portion can be a non-uniform height design, although it can also be a uniform height design. Furthermore, the contact surface 33 has a connecting portion 331 between adjacent third grooves 3113 along the first direction X. The connecting portion 331 protrudes in a direction away from the first side 21 of the liquid cooling plate 2. The distance between the connecting portion 331 and the first side 21 of the liquid cooling plate 2 gradually increases from the edge of the connecting portion 331 towards the center of the connecting portion 331. That is, the second insulating portion can be a non-uniform height design, although it can also be a uniform height design.

[0072] The insulation layer design according to embodiments of this disclosure can be applied to various battery packs. It should be understood that the insulation layer design according to embodiments of this disclosure can also be applied to other battery components, and the embodiments of this disclosure are not limiting in this regard.

[0073] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A battery pack (100), characterized in that, The battery pack (100) includes: The battery module (1) includes multiple battery cells (11); The liquid cooling plate (2) has a first side (21) facing the plurality of battery cells (11); An insulating layer (3) is disposed on the first side (21) of the liquid cooling plate (2) and has a recess (31) disposed on the side of the insulating layer (3) opposite to the liquid cooling plate (2); and Thermally conductive adhesive (4) is used to bond the plurality of battery cells (11) to the insulating layer (3) and to partially fill the recess (31).

2. The battery pack (100) according to claim 1, characterized in that, The battery cells (11) are arranged in multiple rows and multiple columns, with each row of battery cells (11) arranged along a first direction (X) and each column of battery cells (11) arranged along a second direction (Y), the second direction (Y) being perpendicular to the first direction (X); and The recess (31) has a plurality of first grooves (3111) arranged at intervals from each other along the first direction (X). At least a portion of the plurality of first grooves (3111) extends from one side of the insulating layer (3) to the opposite side along the second direction (Y). Along the first direction (X), each first groove (3111) corresponds to at least one row of battery cells (11).

3. The battery pack (100) according to claim 2, characterized in that, In the case where each of the first grooves (3111) corresponds to a column of the battery cells (11), along the first direction (X), the size of the first groove (3111) is D1 and the size of the battery cell (11) is D2, satisfying: D1 < D2.

4. The battery pack (100) according to claim 2, characterized in that, In the case where each of the first grooves (3111) corresponds to at least two columns of the battery cells (11), along the first direction (X), the size of the first groove (3111) is D3, and the size of the at least two columns of the battery cells (11) is D4, satisfying: D3 < D4.

5. The battery pack (100) according to claim 1, characterized in that, The plurality of battery cells (11) are arranged in a plurality of rows and a plurality of columns, with each row of battery cells (11) arranged along a first direction (X) and each column of battery cells (11) arranged along a second direction (Y), the second direction (Y) being perpendicular to the first direction (X); and The recess (31) has a plurality of second grooves (3112) arranged at intervals from each other along the first direction (X). The insulating layer (3) includes a plurality of surrounding portions (32). Each second groove (3112) is formed by a corresponding surrounding portion (32) in the first direction (X) and the second direction (Y). Along the first direction (X), each second groove (3112) corresponds to at least two rows of the battery cells (11).

6. The battery pack (100) according to claim 1, characterized in that, The plurality of battery cells (11) are arranged in multiple rows and multiple columns, with each row of battery cells (11) arranged along a first direction (X) and each column of battery cells (11) arranged along a second direction (Y), the second direction (Y) being perpendicular to the first direction (X); and The recess (31) has a plurality of third grooves (3113), which are arranged in a plurality of rows and a plurality of columns. Each row of third grooves (3113) is arranged along the first direction (X), and each column of third grooves (3113) is arranged along the second direction (Y). Along the first direction (X), each battery cell (11) corresponds to at least one third groove (3113).

7. The battery pack (100) according to claim 5 or 6, characterized in that, When the recess (31) has a plurality of second grooves (3112), each second groove (3112) has a cross-section along the plane defined by the first direction (X) and the second direction (Y) that is at least one of a rectangle, a circle, a triangle, a rhombus, or a hexagon; and When the recess (31) has the plurality of third grooves (3113), each of the third grooves (3113) has a cross-section along the plane defined by the first direction (X) and the second direction (Y) that is at least one of a circle, a rectangle, a triangle, a rhombus or a hexagon.

8. The battery pack (100) according to any one of claims 2, 5 and 6, characterized in that, The insulating layer (3) includes a contact surface (33) facing the battery module (1), and the recess (31) is recessed from the contact surface (33) in a direction away from the battery module (1); and The battery module (1) also has a plurality of gaps (101) disposed between adjacent rows of battery cells (11), and along the first direction (X), the contact surface (33) corresponds to at least one of the plurality of gaps (101).

9. The battery pack (100) according to claim 8, characterized in that, The first groove (3111), the second groove (3112) and the third groove (3113) each have a bottom (312) and a groove opening (313). The groove opening (313) is located on the side of the bottom (312) close to the battery module (1) along the first direction (X). The size of the bottom (312) is D5 and the size of the groove opening (313) is D6, satisfying: D5 < D6.

10. The battery pack (100) according to claim 9, characterized in that, From the edge of the tank bottom (312) towards the center of the tank bottom (312), the distance between the tank bottom (312) and the first side (21) of the liquid cooling plate (2) gradually decreases; and The contact surface (33) has a connecting portion (331) located along the first direction (X) between adjacent first grooves (3111), adjacent second grooves (3112), and adjacent third grooves (3113). The connecting portion (331) protrudes in a direction away from the first side (21) of the liquid cooling plate (2), and the distance between the connecting portion (331) and the first side (21) of the liquid cooling plate (2) gradually increases from the edge of the connecting portion (331) towards the center of the connecting portion (331).

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