Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, the battery module comprises a liquid cooling assembly, a battery cell assembly and a heat conduction piece, the liquid cooling assembly comprises a plurality of liquid cooling plates extending along a first direction, and each liquid cooling plate comprises a plurality of arc-shaped parts; the battery cell assembly comprises a plurality of columnar battery cells; the heat conduction piece is arranged between the battery cell and the arc-shaped part; wherein the included angle between the circle center of the battery cell and the connecting line of the two ends of the heat conducting piece is alpha; wherein alpha is greater than or equal to 72 degrees and less than or equal to 82 degrees; according to the embodiment of the utility model, the alpha value is set to be within the interval, so that the heat exchange area between the battery cell and the liquid cooling plate is increased on the basis of ensuring that the flowing area of the cooling liquid in the liquid cooling plate is fixed, and therefore, the temperature of the battery cell can be controlled in an ideal state under a high-rate charging working condition; and thus, the service life of the battery cell is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery module and a battery pack. Background Art

[0002] With the rapid development of new energy vehicles, users of pure electric vehicles have higher and higher requirements for vehicle range and charging rate, which results in higher and higher energy of battery cells. This leads to higher and higher heat generation of battery cells during operation. At the same time, as the number of battery cells and charging rate increase, temperature consistency becomes more difficult to control, and more efficient liquid cooling solutions are needed to cool and balance the temperature of the battery cells.

[0003] Most of the related technologies use liquid cooling plates to dissipate heat from battery cells. The liquid cooling plates are in contact with the sides of the battery cells, and the coolant flows in the liquid cooling plates to form convection heat exchange with the battery cells. However, due to the limited flow area of ​​the coolant in the liquid cooling plates, under high-rate charging conditions, the battery cell temperature is difficult to control at an ideal state, which will affect the service life of the battery cells. Utility Model Content

[0004] The embodiments of the utility model provide a battery module and a battery pack, which can improve the technical problem that the heat exchange effect between the battery cell and the liquid cooling plate is poor due to the limited flow area of ​​the coolant in the liquid cooling plate, and thus it is difficult to control the temperature of the battery cell.

[0005] In a first aspect, an embodiment of the present utility model provides a battery module, comprising:

[0006] A liquid cooling assembly, comprising a plurality of liquid cooling plates extending along a first direction, the plurality of liquid cooling plates being arranged at intervals along a second direction intersecting the first direction, and each of the liquid cooling plates comprising a plurality of arc-shaped portions;

[0007] A battery cell assembly, comprising a plurality of battery cells arranged in a columnar shape, each of the battery cells being arranged on one side of the liquid cooling plate in the second direction and connected to the corresponding arc-shaped portion; and,

[0008] A heat conducting member, disposed between the battery core and the arc-shaped portion and connected to the battery core and the arc-shaped portion;

[0009] The angle between the center of the battery core and the line connecting the two ends of the heat conducting member is α; wherein α satisfies: 72°≤α≤82°.

[0010] In one embodiment, in the first direction, the thickness of one of the heat conducting members in the second direction first gradually decreases and then gradually increases.

[0011] In one embodiment, the shortest distance between the battery core and the arc-shaped portion in the second direction is defined as L;

[0012] Wherein, L satisfies: 0.05mm≤L≤0.5mm.

[0013] In one embodiment, the angle between the center of the circle where the arc portion is located and the line connecting the two ends of the arc portion is defined as β; wherein β satisfies: 56°≤β≤60°.

[0014] In one embodiment, in any two adjacent liquid cooling plates, the two arc-shaped portions arranged on the two liquid cooling plates are arranged opposite to each other in the second direction;

[0015] The battery core is connected to both of the two arc-shaped portions that are arranged opposite to each other in the second direction.

[0016] In one embodiment, the liquid cooling plate further includes a connecting portion, wherein the connecting portion connects two adjacent arc-shaped portions, and the connecting portion is in a flat plate shape or an arc shape.

[0017] In one embodiment, the heat conducting member comprises:

[0018] A first insulating layer is located between the battery core and the arc-shaped portion; and

[0019] two first bonding layers;

[0020] Among them, one of the two first adhesive layers is located between the first insulating layer and the arc-shaped portion and is respectively connected to the first insulating layer and the arc-shaped portion, and the other is located between the first insulating layer and the battery core and is respectively connected to the first insulating layer and the battery core.

[0021] In one embodiment, the liquid cooling plate further includes a connecting portion, the heat conducting member includes a second adhesive layer, and the second adhesive layer is located between the arc-shaped portion and the battery core and connects the arc-shaped portion and the battery core;

[0022] The liquid cooling assembly further includes a second insulating layer, which is coated on an outer surface of the liquid cooling plate, and the heat conducting member is in contact with a portion of the second insulating layer.

[0023] In one embodiment, the liquid cooling plate is formed with a liquid inlet channel and a liquid outlet channel spaced apart in the third direction, and a first cavity connecting the liquid inlet channel and the liquid outlet channel, the liquid inlet channel and the liquid outlet channel both extend along the first direction, and the first direction, the second direction and the third direction intersect each other in pairs;

[0024] The liquid cooling plate comprises a liquid inlet end and a liquid outlet end, the liquid inlet end is connected to the liquid inlet channel, and the liquid outlet end is connected to the liquid outlet channel;

[0025] Wherein, at least part of the orthographic projections of the liquid inlet channel and the liquid outlet channel in the second direction fall on the battery core.

[0026] In one embodiment, the liquid inlet and the liquid outlet are both arranged at the same end of the liquid cooling plate;

[0027] The liquid cooling assembly also includes:

[0028] A connecting member is arranged at one end of the liquid cooling plate provided with the liquid inlet and the liquid outlet, wherein a second cavity and a third cavity arranged at intervals are arranged in the connecting member, the second cavity is communicated with the liquid inlet, and the third cavity is communicated with the liquid outlet;

[0029] a liquid inlet pipeline, connected to the second cavity of the connecting piece; and

[0030] The liquid outlet pipeline is communicated with the third cavity of the connecting piece.

[0031] In a second aspect, an embodiment of the present invention provides a battery pack, which includes the battery module as described above.

[0032] Beneficial effects of the embodiments of the utility model:

[0033] In an embodiment of the utility model, the battery cell exchanges heat with the liquid cooling plate through the heat conductive member. By setting the α value within the above-mentioned interval, the heat exchange area between the battery cell and the liquid cooling plate is increased on the basis of ensuring a certain flow area of ​​the coolant in the liquid cooling plate. Therefore, under high-rate charging conditions, the temperature of the battery cell can be controlled in an ideal state, thereby increasing the service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 It is a three-dimensional schematic diagram of a battery module provided by an embodiment of the utility model;

[0036] Figure 2 It is a three-dimensional schematic diagram of a battery module provided by an embodiment of the utility model without a box body;

[0037] Figure 3 It is a structural schematic diagram of a battery module provided by an embodiment of the utility model without a box body;

[0038] Figure 4 yes Figure 3 An enlarged schematic diagram of an embodiment at A in the middle;

[0039] Figure 5 yes Figure 3 An enlarged schematic diagram of another embodiment at A in the middle;

[0040] Figure 6 yes Figure 3 The enlarged schematic diagram of point B in the middle;

[0041] Figure 7 It is a partial cross-sectional schematic diagram of a liquid cooling plate provided in an embodiment of the utility model;

[0042] Figure 8 It is a partial cross-sectional schematic diagram of a liquid cooling plate provided in an embodiment of the utility model;

[0043] Fig. 9 It is a partial exploded schematic diagram of a battery module provided by an embodiment of the utility model;

[0044] Fig.10 It is an exploded schematic diagram of a liquid cooling plate provided in an embodiment of the utility model.

[0045] Reference numerals:

[0046] 1000, battery module; 1, liquid cooling assembly; 11, liquid cooling plate; 11A, arc portion; 11B, connecting portion; 2, battery cell assembly; 21, battery cell; 3, heat conducting member; 31, first insulating layer; 32, first bonding layer; 33, second bonding layer; 4, second insulating layer; 111, liquid inlet channel; 111A, liquid inlet sub-channel; 112, liquid outlet channel; 112A, liquid outlet sub-channel; 11 3. First cavity; 114. Liquid inlet end; 115. Liquid outlet end; 101. Liquid cooling plate body; 102. Sealing piece; 12. Connecting piece; 121. Second cavity; 122. Third cavity; 13. Liquid inlet pipeline; 14. Liquid outlet pipeline; 131. Liquid inlet pipe section; 141. Liquid outlet pipe section; 15. Liquid inlet connector; 16. Liquid outlet connector; 17. Liquid inlet port; 18. Liquid outlet port; 19. Box body. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0048] With the rapid development of new energy vehicles, users of pure electric vehicles have higher and higher requirements for vehicle range and charging rate, which results in higher and higher energy of battery cells. This leads to higher and higher heat generation of battery cells during operation. At the same time, as the number of battery cells and charging rate increase, temperature consistency becomes more difficult to control, and more efficient liquid cooling solutions are needed to cool and balance the temperature of the battery cells.

[0049] Most of the related technologies use liquid cooling plates to dissipate heat from battery cells. The liquid cooling plates are in contact with the sides of the battery cells, and the coolant flows in the liquid cooling plates to form convection heat exchange with the battery cells. However, due to the limited flow area of ​​the coolant in the liquid cooling plates, under high-rate charging conditions, the battery cell temperature is difficult to control at an ideal state, which will affect the service life of the battery cells.

[0050] In view of this, the utility model proposes a battery module. Figures 1 to 10 Some embodiments of the present invention are shown below. Figures 1 to 10 As shown in the direction marking, the X direction is the first direction, the Y direction is the second direction, and the Z direction is the third direction. The first direction, the second direction, and the third direction intersect each other in pairs, and the angles between the first direction, the second direction, and the third direction are not limited, and can be 80°, 85°, 90°, 95°, or 100°; preferably, in the following embodiments, the angles between the first direction, the second direction, and the third direction are 90° for explanation, that is, a spatial rectangular coordinate system is established by the first direction, the second direction, and the third direction to explain some embodiments of the present application; it should be emphasized that the angle between the first direction, the second direction, and the third direction is 90°, which does not constitute a limitation on the following embodiments of the present application.

[0051] See also Figure 1 to Figure 2The battery module 1000 includes a liquid cooling assembly 1, and the liquid cooling assembly 1 includes a plurality of liquid cooling plates 11 extending along a first direction X, and the plurality of liquid cooling plates 11 are arranged at intervals along a second direction Y, and each of the liquid cooling plates 11 includes a plurality of arc portions 11A; wherein, the bending direction of the arc portion 11A on one of the liquid cooling plates 11 is not limited, and since the liquid cooling plate 11 includes two sides arranged opposite to each other in the second direction Y, the arc portion 11A can be formed by bending a portion of the liquid cooling plate 11 on either side in the second direction Y.

[0052] In some embodiments, the battery module 1000 further includes a plurality of battery cells 21 arranged in a columnar shape, each of which is arranged on one side of the liquid cooling plate 11 in the second direction Y and connected to the corresponding arc-shaped portion 11A; that is, the battery cell 21 is installed at the arc-shaped portion 11A, so that heat exchange between the battery cell 21 and the liquid cooling plate 11 can be achieved, and the liquid cooling plate 11 can dissipate heat from the battery cell 21. The specific structural form of the battery cell 21 is not limited, and can be a multi-prism structure such as a quadrangular prism, a hexagonal prism, or a cylindrical structure.

[0053] It can be understood that, since the battery cell 21 is arranged in a columnar shape, when the battery cell 21 is installed on the arc portion 11A, the side of the battery cell 21 exchanges heat with the arc portion 11A, and the curved arc portion 11A can generate a larger heat exchange area with the side of the battery cell 21, thereby improving the heat exchange efficiency of the liquid cooling plate 11 to the battery cell 21. On this basis, since the surface of the arc portion 11A close to the battery cell 21 is a curved surface, in order to improve the heat exchange efficiency between the battery cell 21 and the liquid cooling plate 11, in a preferred embodiment of the present application, the battery cell 21 is a cylindrical structure.

[0054] See also Figure 3 to Figure 4 In some embodiments, the battery module 1000 further includes a heat conductor 3, which is disposed between the battery cell 21 and the arc-shaped portion 11A and connected to the battery cell 21 and the arc-shaped portion 11A. That is, in this embodiment, since the side of the battery cell 21 is arc-shaped, the battery cell 21 exchanges heat with the arc-shaped portion 11A through the heat conductor 3. In order to ensure a larger contact area between the heat conductor 3 and the battery cell 21, that is, to obtain a larger heat exchange area of ​​the battery cell 21, the heat conductor 3 is disposed in contact with the side of the battery cell 21.

[0055] Furthermore, the angle between the center of the battery core 21 and the line connecting the two ends of the heat conducting member 3 is α; wherein α satisfies: 72°≤α≤82°.

[0056] In an embodiment of the utility model, the battery cell 21 performs heat exchange with the liquid cooling plate 11 through the heat conductive member 3. By setting the α value within the above-mentioned interval, the heat exchange area between the battery cell 21 and the liquid cooling plate 11 is increased on the basis of ensuring a certain flow area of ​​the coolant in the liquid cooling plate 11. Therefore, under high-rate charging conditions, the temperature of the battery cell 21 can be controlled in an ideal state, thereby increasing the service life of the battery cell 21.

[0057] Among them, if the α value is less than 72°, the contact area between the heat conductor 3 and the battery cell 21 is too small, thereby affecting the heat exchange efficiency between the battery cell 21 and the liquid cooling plate 11; if the α value is greater than 82°, because the curvature of the arc portion 11A is inconsistent with that of the battery cell 21, the thickness of the heat conductor 3 located between the battery cell 21 and the arc portion 11A in the second direction Y is different. When the α value is greater than 82°, the heat conductor 3 is partially too thick, the thermal resistance of the over-thick area of ​​the heat conductor 3 is too large, and the heat exchange efficiency is poor. At the same time, the volume of the heat conductor 3 increases, resulting in an increase in the corresponding cost of using the heat conductor 3.

[0058] The value of α can be 72°, 73°, 74°, 75°, 76°, 76.5°, 77°, 77.5°, 78°, 79°, 80°, 81°, or 82°.

[0059] It should be noted that the liquid cooling plate 11 and the battery cell 21 are connected via the heat conductor 3, and the thermal resistance calculation formula is θ=L / (A*λ); wherein θ is the contact thermal resistance, L is the thermal conductive thickness, A is the contact area, and λ is the thermal conductivity; the smaller the θ value, the higher the heat exchange efficiency between the liquid cooling plate 11 and the battery cell 21; since the λ value and the L value are limited by the material of the heat conductor 3 and the size of the battery pack, the variation is not large, and thus it is necessary to increase the heat exchange contact area between the liquid cooling plate 11 and the battery cell 21, that is, the A value; and in the embodiment of the present application, the A value is related to the α value, and the larger the α, the larger the A value, and thus the range of the α value is controlled to increase the heat exchange area between the liquid cooling plate 11 and the battery cell 21.

[0060] See also Figure 5In one embodiment of the present application, the heat conductive member 3 includes a first insulating layer 31 and a first adhesive layer 32, wherein the first insulating layer 31 is located between the battery cell 21 and the arc-shaped portion 11A, one of the two first adhesive layers 32 is located between the first insulating layer 31 and the arc-shaped portion 11A and is respectively connected to the first insulating layer 31 and the arc-shaped portion 11A, and the other is located between the first insulating layer 31 and the battery cell 21 and is respectively connected to the first insulating layer 31 and the battery cell 21. That is, in this embodiment, the battery cell 21 and the arc-shaped portion 11A are bonded by the first adhesive layer 32 in the heat conductive member 3, thereby realizing the installation connection between the battery cell 21 and the liquid cooling plate 11; further, since the first insulating layer 31 is provided in the heat conductive member 3, the first insulating layer 31 can play an insulating role between the liquid cooling plate 11 and the battery cell 21, thereby avoiding the short circuit problem in the battery module 1000.

[0061] As described above, the heat conductor 3 has both heat conduction and insulation functions, so that the functional diversity of the heat conductor 3 is improved; in addition, the setting position of the heat conductor 3 is not limited, and it can be set on the arc portion 11A; it can also be set on the entire outer surface of the liquid cooling plate 11; when the heat conductor 3 is set on the entire outer surface of the liquid cooling plate 11, the first bonding layer 32 located between the first insulating layer 31 and the liquid cooling plate 11 fixes the liquid cooling plate 11 and the first insulating layer 31, and the first bonding layer 32 located on the side of the first insulating layer 31 away from the liquid cooling plate 11 can be set at the arc portion 11A position, so as to bond the battery cell 21.

[0062] See also Figure 4 In another embodiment of the present application, the heat conductive member 3 includes a second adhesive layer 33, and the second adhesive layer 33 is located between the arc portion 11A and the battery cell 21 and connects the arc portion 11A and the battery cell 21; that is, in this embodiment, the second adhesive layer 33 bonds the battery cell 21 and the arc portion 11A, thereby realizing the installation connection between the battery cell 21 and the liquid cooling plate 11.

[0063] It should be noted that in the above two embodiments, the specific materials of the first adhesive layer 32 and the second adhesive layer 33 are not limited, and can be photosensitive adhesive, pressure-sensitive adhesive, thermally conductive structural adhesive or thermally conductive gel, etc. Since the first adhesive layer 32 and the second adhesive layer 33 are both colloid structures, the colloid can be compressed and deformed, so as to facilitate fixing the battery cell 21 on the arc portion 11A and increase the contact area between the thermal conductive member 3 and the battery cell 21. It can be understood that if the thermal conductive member 3 cannot be compressed and deformed, it is not easy for the thermal conductive member 3 to fit the side of the battery cell 21, thereby reducing the contact area between the thermal conductive member 3 and the battery cell 21.

[0064] In some embodiments of the present application, the liquid cooling assembly 1 further includes a second insulating layer 4, the second insulating layer 4 is coated on the outer surface of the liquid cooling plate 11, and the heat conductive member 3 is in contact with part of the second insulating layer 4; that is, in this embodiment, the second insulating layer 4 can play the role of insulating the liquid cooling plate 11 from the battery cell 21, thereby avoiding a short circuit problem in the battery pack. Based on the technical solution that the heat conductive member 3 includes a second adhesive layer 33 in the above embodiment, the second insulating layer 4 can play the role of insulating the battery cell 21 from the liquid cooling plate 11.

[0065] Based on the technical solution in which the heat conductor 3 includes the first insulating layer 31 and the first adhesive layer 32 in the above embodiment, the outer surface of the liquid cooling plate 11 can also be covered with the second insulating layer 4, and the second insulating layer 4 can further insulate the battery cell 21 from the liquid cooling plate 11.

[0066] In addition, since the curvatures of the arc-shaped portion 11A and the battery cell 21 are different, the shortest distances from various points on the peripheral side surface of the battery cell 21 to the arc-shaped portion 11A are different in the second direction Y, that is, in the first direction X, the gap between the battery cell 21 and the arc-shaped portion 11A changes in the form of gradually decreasing and then gradually increasing; it can be understood that the heat conductive member 3 needs to be arranged between the battery cell 21 and the arc-shaped portion 11A so that the battery cell 21 and the arc-shaped portion 11A can exchange heat. The larger the contact area between the heat conductive member 3 and the battery cell 21 and the arc-shaped portion 11A, the better the heat exchange effect between the battery cell 21 and the arc-shaped portion 11A. Therefore, please refer to Figure 4 In one embodiment of the present application, in the first direction X, the thickness of the heat conducting member 3 in the second direction Y gradually decreases and then gradually increases. That is, the configuration is such that the shape of the heat conducting member 3 matches the gap between the battery core 21 and the arc-shaped portion 11A, thereby improving the heat exchange effect between the battery core 21 and the arc-shaped portion 11A.

[0067] Similarly, the battery cell 21 is fixedly mounted on the arc portion 11A through the heat conductive member 3. On the basis that the heat conductive member 3 is respectively attached to the surface of the arc portion 11A and the battery cell 21 on two opposite sides in the second direction Y, the reliability of the fixation between the battery cell 21 and the liquid cooling plate 11 can be improved.

[0068] It can be understood that, in the above embodiment, the heat conductive member 3 is arranged to be a structural setting that first gradually decreases and then gradually increases. Compared with the structural setting in which the thickness of the heat conductive member 3 in the second direction Y is the same or the structural setting in which the local thickness of the heat conductive member 3 changes and the heat conductive member 3 does not match the gap between the battery cell 21 and the arc-shaped portion 11A, the space between the two adjacent liquid cooling plates 11 can meet the assembly requirements of the battery cell 21, that is, the heat conductive member 3 will not occupy the installation space of the battery cell 21, so that the heat conductive member 3, the battery cell 21 and the liquid cooling plate 11 will not produce structural interference during assembly.

[0069] Further, the shortest distance between the battery cell 21 and the arc-shaped portion 11A in the second direction Y is defined as L; wherein, L satisfies: 0.05mm≤L≤0.5mm. The L value is set within this range to meet the heat exchange requirements of the liquid cooling plate 11 and the battery cell 21; it can be understood that the smaller the L value, the higher the heat exchange efficiency between the liquid cooling plate 11 and the battery cell 21, but due to the problem of assembly tolerance and the fact that the heat conductor 3 itself has a certain thickness in the second direction Y, the L value is set to be greater than or equal to 0.05mm; and the larger the L value, the greater the thermal resistance between the liquid cooling plate 11 and the battery cell 21, and the greater the length of the battery module 1000 in the second direction Y, thereby increasing the space occupied by the battery module 1000 in the battery pack, resulting in a decrease in the energy density of the battery pack, so the L value is set to be less than or equal to 0.5mm.

[0070] Among them, the value of L can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, and 0.5mm.

[0071] See also Figure 3In some embodiments of the present application, in any two adjacent liquid cooling plates 11, the two arc-shaped portions 11A disposed on the two liquid cooling plates 11 are disposed opposite to each other in the second direction Y; the battery cell 21 is connected to both of the two arc-shaped portions 11A disposed opposite to each other. That is, in this embodiment, the battery cell 21 is installed between two adjacent liquid cooling plates 11, and both of the liquid cooling plates 11 can perform heat exchange with the battery cell 21, thereby improving the heat dissipation efficiency of the battery cell 21.

[0072] In one embodiment of the present application, the liquid cooling plate 11 further comprises a connecting portion 11B, the connecting portion 11B connects two adjacent arc-shaped portions 11A, and the connecting portion 11B is in a flat plate or arc shape. The setting of the connecting portion 11B can make a certain spacing between two adjacent arc-shaped portions 11A in the first direction X, thereby providing a certain space for the installation of the battery cell 21; when the connecting portion 11B is in a flat plate shape, the connecting portion 11B is not easy to be installed for the battery cell; when the connecting portion 11B is in an arc shape, please refer to Figure 3 , the bending direction of the connecting portion 11B and the arc portion 11A in the second direction Y is opposite, so that the battery cell 21 can be easily installed between the connecting portions 11B of two adjacent arc portions 11A. At this time, the liquid cooling plate 11 is continuously bent, that is, it is arranged in a serpentine shape; therefore, the number of the multiple battery cells 21 installed between the two liquid cooling plates 11 can be maximized; the multiple battery cells 21 defined between the two liquid cooling plates 11 are a battery cell group, and such an arrangement makes the multiple battery cells 21 in the two adjacent battery cell groups in the second direction Y staggered in the second direction Y.

[0073] It should be noted that when the connecting portion 11B and the arc-shaped portion 11A are both arranged in an arc shape and are used for installing the battery cell 21 , the connecting portion 11B has the same structural features as the arc-shaped portion 11A described above.

[0074] In addition, since the bending angle of the arc portion 11A of the liquid cooling plate 11 is related to the spacing between the adjacent battery cells 21, it is necessary to ensure the electrical safety gap between the liquid cooling plate 11 and the battery cells 21 and to rationally utilize the space in the battery pack; and since the greater the bending angle of the arc portion 11A, the lower the energy density in the battery pack; therefore, please refer to Figure 6 In some embodiments of the present application, the angle between the center of the circle where the arc portion 11A is located and the line connecting the two ends of the arc portion 11A is defined as β; wherein β satisfies: 56°≤β≤60°.

[0075] See also Figures 7 to 9In some embodiments of the present application, the liquid cooling plate 11 is formed with a liquid inlet channel 111 and a liquid outlet channel 112 arranged at intervals in the third direction Z, and a first cavity 113 connecting the liquid inlet channel 111 and the liquid outlet channel 112. The liquid inlet channel 111 and the liquid outlet channel 112 both extend along the first direction X, and at least part of the orthographic projections of the liquid inlet channel 111 and the liquid outlet channel 112 in the second direction Y fall on the battery cell 21; that is, in this embodiment, the coolant passes through the same battery cell 21 when flowing in the liquid inlet channel 111 and the liquid outlet channel 112, and the multiple battery cells 21 between the two liquid cooling plates 11 are explained as a battery cell group. The arrangement of the liquid inlet channel 111 and the liquid outlet channel 112 enables the coolant to flow through each of the battery cells 21 in the battery cell group twice in succession, thereby improving the cooling effect on the multiple battery cells 21 in the battery cell group.

[0076] In some embodiments of the present application, the liquid cooling plate 11 includes a liquid inlet end 114 and a liquid outlet end 115, wherein the liquid inlet end 114 is connected to the liquid inlet channel 111, and the liquid outlet end 115 is connected to the liquid outlet channel 112. That is, the cooling liquid flows into the liquid inlet channel 111 through the liquid inlet end 114, and flows out of the liquid outlet channel 112 through the liquid outlet end 115. In the liquid cooling plate 11, the flow path of the cooling liquid is as follows: liquid inlet end 114-liquid inlet channel 111-first cavity 113-liquid outlet channel 112-liquid outlet end 115.

[0077] It should be noted that there is no restriction on the specific channel forms of the liquid inlet channel 111 and the liquid outlet channel 112, and they may be formed by one channel or by multiple sub-channels. In a specific embodiment of the present application, the liquid inlet channel 111 includes multiple liquid inlet sub-channels 111A arranged in parallel in the third direction Z, and the liquid outlet channel 112 includes multiple liquid outlet sub-channels 112A arranged in parallel in the third direction Z. There is no restriction on the number of the liquid inlet sub-channels 111A and the liquid outlet sub-channels 112A, and they may be adjusted according to the actual height of the liquid cooling plate 11 in the third direction Z.

[0078] In some embodiments of the present application, the liquid cooling plate 11 includes a liquid cooling plate body 101 and a blocking member 102, the liquid cooling plate body 101 extends along the first direction X, the liquid inlet channel 111 and the liquid outlet channel 112 are arranged in the liquid cooling plate body 101, the liquid inlet end 114 and the liquid outlet end 115 are both arranged at the same end of the liquid cooling plate body 101 in the first direction X; the blocking member 102 is arranged at the other end of the liquid cooling plate body 101 in the first direction X, and the first cavity 113 is arranged in the blocking member 102. That is, in this embodiment, the blocking member 102 can be detachably connected to the liquid cooling plate 11, so the size of the first cavity 113 can be adjusted, and by replacing the blocking member 102 with the first cavity 113 of different sizes, the flow uniformity of the cooling liquid in the liquid cooling plate 11 is adjusted, that is, the flow resistance of the cooling liquid is adjusted. It can be understood that if the cross-sectional area of ​​the first cavity 113 in the plane where the first direction X and the third direction Z are located is reduced, the flow resistance of the coolant will increase.

[0079] The liquid inlet end 114 and the liquid outlet end 115 are located at the same end of the liquid cooling plate body 101, and the first cavity 113 is located at the other end of the liquid cooling plate body 101. Such arrangement allows the coolant to flow through each of the battery cells 21 twice in succession, and the battery cells 21 that are flowed through by the coolant earlier the first time are flowed through later, and vice versa, the battery cells 21 that are flowed through by the coolant later the first time are flowed through earlier, and the coolant flows through them again earlier. Since the temperature of the coolant gradually rises and the cooling effect gradually decreases during the flow process, the better the cooling effect of the coolant on the battery cell 21 when the coolant flows through it for the first time, the worse the cooling effect of the same battery cell 21 when the coolant flows through it for the second time. The secondary cooling effects are superimposed, which can balance the cooling effect of the multiple battery cells 21 in the first direction X, thereby making the battery module 1000 have better temperature uniformity.

[0080] See also Figures 9 and 10In some embodiments of the present application, the liquid cooling component 1 also includes a connector 12, a liquid inlet pipe and a liquid outlet pipe. The connector 12 is arranged at one end of the liquid cooling plate 11 provided with the liquid inlet end 114 and the liquid outlet end 115. The connector 12 is provided with a second cavity 121 and a third cavity 122 arranged at intervals. The second cavity 121 is connected to the liquid inlet end 114, and the third cavity 122 is connected to the liquid outlet end 115; the liquid inlet pipeline 13 is connected to the second cavity 121 of the connector 12; the liquid outlet pipeline 14 is connected to the third cavity 122 of the connector 12. That is, in this embodiment, the cooling liquid flows from the liquid inlet pipe into the second cavity 121 in the connecting member 12, and flows from the third cavity 122 in the connecting member 12 to the liquid outlet pipe, and the second cavity 121 of the connecting member 12 is connected to the liquid inlet end 114, and the third cavity 122 is connected to the liquid outlet end 115, that is, the flow path of the cooling liquid in the liquid cooling plate 11 is as described in the above embodiment, and through the liquid inlet pipe, the liquid outlet pipe and the plurality of connecting members 12, the cooling liquid can flow into the plurality of liquid cooling plates 11 and flow out from the plurality of liquid cooling plates 11, thereby realizing the circulation of the cooling liquid in the liquid cooling component 1, thereby performing heat exchange on the battery cell component 2.

[0081] Further, the liquid inlet pipeline 13 includes a plurality of liquid inlet pipe sections 131 extending along the second direction Y, each of the liquid inlet pipe sections 131 is disposed between two adjacent connectors 12 and communicates with the second cavities 121 of the two adjacent connectors 12; the liquid outlet pipeline 14 includes a plurality of liquid outlet pipe sections 141 extending along the second direction Y, each of the liquid outlet pipe sections 141 is disposed between two adjacent connectors 12 and communicates with the third cavities 122 of the two adjacent connectors 12. That is, in this embodiment, one of the liquid inlet pipe sections 131 can communicate with the second cavities 121 in the two connectors 12, and one of the liquid outlet pipe sections 141 can communicate with the third cavities 122 in the two connectors 12, so that the cooling liquid can flow between the two adjacent connectors 12.

[0082] In addition, the orthographic projections of the liquid inlet pipe section 131 and the liquid outlet pipe section 141 in the second direction Y fall on the connecting member 12, so that the liquid inlet pipe section 131 and the liquid outlet pipe section 141 do not protrude from between the two connecting members 12, thereby reducing the overall volume of the battery module 1000, thereby reducing the space occupied by the battery module 1000 in the battery pack.

[0083] Please refer again Fig. 9 and Fig.10In some embodiments of the present application, the liquid cooling assembly 1 further includes a liquid inlet joint 15 and a liquid outlet joint 16, both of which are arranged on the connecting member 12, the liquid inlet joint 15 is in communication with the second cavity 121 of the connecting member 12, and the liquid outlet joint 16 is in communication with the third cavity 122 of the connecting member 12; wherein at least a portion of the liquid inlet pipe section 131 is sleeved on the peripheral side of the liquid inlet joint 15, and at least a portion of the liquid outlet pipe section 141 is sleeved on the peripheral side of the liquid outlet joint 16. That is, in this embodiment, in order to ensure that the liquid inlet pipe section 131, the liquid outlet pipe section 141 and the connecting member 12 are firmly fixed, the liquid inlet pipe section 131 is sleeved on the liquid inlet joint 15, and the liquid outlet pipe section 141 is sleeved on the liquid outlet joint 16.

[0084] In some embodiments of the present application, the liquid cooling component 1 is further provided with a liquid inlet 17 and a liquid outlet 18 on the connector 12 on one side in the second direction Y; the liquid inlet 17 is connected to the second cavity 121 of the connector 12, and the liquid outlet 18 is connected to the third cavity 122 of the connector 12. That is, in this embodiment, the cooling liquid can be input into the liquid cooling component 1 from the liquid inlet 17, and flow out from the liquid outlet 18 after completing the circulation in the liquid cooling component 1.

[0085] Please refer again Figure 1 The battery module 1000 further includes a box body 19 , the liquid cooling assembly 1 and the battery cell assembly 2 are both disposed in the box body 19 , and the liquid inlet 17 and the liquid outlet 18 extend out of the box body 19 .

[0086] The utility model further proposes a battery pack, which includes a battery module 1000. The battery module 1000 is as described above. Since the battery pack adopts all the technical solutions of all the above embodiments, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0087] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery module, characterized in that: include: A liquid cooling assembly, comprising a plurality of liquid cooling plates extending along a first direction, the plurality of liquid cooling plates being arranged at intervals along a second direction intersecting the first direction, and each of the liquid cooling plates comprising a plurality of arc-shaped portions; A battery cell assembly, comprising a plurality of battery cells arranged in a columnar shape, each of the battery cells being arranged on one side of the liquid cooling plate in the second direction and connected to the corresponding arc-shaped portion; and, A heat conducting member, disposed between the battery core and the arc-shaped portion and connected to the battery core and the arc-shaped portion; The angle between the center of the battery core and the line connecting the two ends of the heat conducting member is α; wherein α satisfies: 72°≤α≤82°.

2. The battery module according to claim 1, characterized in that: In the first direction, the thickness of one of the heat conducting members in the second direction gradually decreases and then gradually increases.

3. The battery module according to claim 2, characterized in that: Define the shortest distance between the battery core and the arc-shaped portion in the second direction as L; Wherein, L satisfies: 0.05mm≤L≤0.5mm.

4. The battery module according to claim 1, characterized in that: The angle between the center of the circle where the arc portion is located and the line connecting the two ends of the arc portion is defined as β; wherein β satisfies: 56°≤β≤60°.

5. The battery module according to any one of claims 1 to 4, characterized in that: In any two adjacent liquid cooling plates, the two arc-shaped portions arranged on the two liquid cooling plates are arranged opposite to each other in the second direction; The battery core is connected to both of the two arc-shaped portions that are arranged opposite to each other in the second direction.

6. The battery module according to any one of claims 1 to 4, characterized in that: The liquid cooling plate further includes a connecting portion, which connects two adjacent arc-shaped portions, and the connecting portion is in a flat plate shape or an arc shape.

7. The battery module according to any one of claims 1 to 4, characterized in that: The heat conducting member comprises: A first insulating layer is located between the battery core and the arc-shaped portion; and two first bonding layers; Among them, one of the two first adhesive layers is located between the first insulating layer and the arc-shaped portion and is respectively connected to the first insulating layer and the arc-shaped portion, and the other is located between the first insulating layer and the battery core and is respectively connected to the first insulating layer and the battery core.

8. The battery module according to any one of claims 1 to 4, characterized in that: The heat conductive member comprises a second adhesive layer, the second adhesive layer is located between the arc-shaped portion and the battery core and connects the arc-shaped portion and the battery core; The liquid cooling assembly further includes a second insulating layer, which is coated on an outer surface of the liquid cooling plate, and the heat conducting member is in contact with a portion of the second insulating layer.

9. The battery module according to any one of claims 1 to 4, characterized in that: The liquid cooling plate is formed with a liquid inlet channel and a liquid outlet channel spaced apart in the third direction, and a first cavity connecting the liquid inlet channel and the liquid outlet channel, the liquid inlet channel and the liquid outlet channel both extend along the first direction, and the first direction, the second direction and the third direction intersect each other in pairs; The liquid cooling plate comprises a liquid inlet end and a liquid outlet end, the liquid inlet end is connected to the liquid inlet channel, and the liquid outlet end is connected to the liquid outlet channel; Wherein, at least part of the orthographic projections of the liquid inlet channel and the liquid outlet channel in the second direction fall on the battery core.

10. The battery module according to claim 9, characterized in that: The liquid inlet end and the liquid outlet end are both arranged at the same end of the liquid cooling plate; The liquid cooling assembly also includes: A connecting member is arranged at one end of the liquid cooling plate provided with the liquid inlet and the liquid outlet, wherein a second cavity and a third cavity arranged at intervals are arranged in the connecting member, the second cavity is communicated with the liquid inlet, and the third cavity is communicated with the liquid outlet; a liquid inlet pipeline, connected to the second cavity of the connecting piece; and The liquid outlet pipeline is communicated with the third cavity of the connecting piece.

11. A battery pack, characterized in that: Comprising the battery module according to any one of claims 1 to 10.

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