A battery pack

Abstract

The present invention relates to the technical field of new energy batteries, and discloses a battery pack, including: a box, a heat exchange tube, a battery cell and a glue layer, the box includes a bottom plate, and a receiving groove is provided on the upper surface of the bottom plate; the heat exchange tube is provided in the receiving groove, the depth of the receiving groove is H1mm, and the height of the heat exchange tube is H2mm, wherein H1≥H2; the battery cell is provided on the bottom plate and is located above the heat exchange tube; the glue layer is provided between the heat exchange tube and the battery cell, and at least part of the glue layer is provided in the receiving groove, and the battery cell, the heat exchange tube and the bottom plate are connected through the glue layer. The present invention provides a battery pack, and a heat exchange tube is provided to exchange heat with the battery cell, thereby ensuring the flatness of the connection between the box and the bottom surface of the battery, and at the same time ensuring the heat exchange effect.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a battery pack. Background Art

[0002] At present, in order to achieve battery cooling, a liquid cooling plate in contact with the battery is usually set at the bottom of the battery box. A flow channel for the cooling medium to pass through is set in the liquid cooling plate. The molding process is complicated, and the strength of the liquid cooling plate itself is low, resulting in an unsatisfactory heat exchange effect on the battery. Summary of the invention

[0003] The purpose of the present invention is to provide a battery pack that can ensure the flatness of the connection between the box body and the bottom surface of the battery and ensure the heat exchange effect on the battery.

[0004] In order to achieve the above object, the present invention provides a battery pack, comprising:

[0005] A box body, comprising a bottom plate, the bottom plate is used to place the battery unit, and the upper surface of the bottom plate is provided with a receiving groove;

[0006] A heat exchange tube, which is arranged in the receiving tank, the depth of the receiving tank is H1mm, the height of the heat exchange tube is H2mm, wherein H1≥H2, and the height of the heat exchange tube is the maximum dimension of the heat exchange tube in the depth direction of the receiving tank;

[0007] The battery unit is located above the heat exchange tube;

[0008] An adhesive layer is arranged between the heat exchange tube and the battery unit, at least a part of the adhesive layer is arranged in the receiving groove, and the battery unit, the heat exchange tube and the bottom plate are connected through the adhesive layer.

[0009] The present invention provides a battery pack, which has the following advantages compared with the prior art:

[0010] The battery pack of the present invention comprises a box body, a battery cell, a heat exchange tube and an adhesive layer. A receiving groove is provided on the bottom plate of the box body, and the heat exchange tube is provided in the receiving groove. This structure replaces the liquid cooling plate in the prior art, and adopts the heat exchange tube to exchange heat for the battery cell. In the depth direction of the receiving groove, the height of the heat exchange tube is less than the depth of the receiving groove, which can provide sufficient space for the adhesive layer and ensure the flatness of the connection plane between the bottom plate and the bottom surface of the battery cell. In this way, the bottom plate around the receiving groove can support the battery cell, ensure the connection strength, reduce the pressure of the battery cell on the heat exchange tube, prevent the heat exchange tube from being deformed due to the pressure of the battery cell, and ensure the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1It is a schematic diagram of the internal structure of a battery pack according to an embodiment of the present invention.

[0012] Figure 2 It is a schematic diagram of the structure in which heat exchange tubes are arranged inside the box body according to an embodiment of the present invention.

[0013] Figure 3 It is a schematic diagram of the structure in which no heat exchange tubes are arranged inside the box body of the embodiment of the present invention.

[0014] Figure 4 yes Figure 3 A magnified schematic diagram of center A.

[0015] Figure 5 It is a front view of the box body when heat exchange tubes are arranged in the embodiment of the present invention.

[0016] Figure 6 yes Figure 5 Cross-sectional view along the BB axis.

[0017] Figure 7 yes Figure 6 Enlarged schematic diagram of point C in the middle.

[0018] Figure 8 It is a schematic diagram of the structure of the heat exchange flow channel, the water inlet flow channel and the water outlet flow channel according to an embodiment of the present invention.

[0019] Fig. 9 yes Figure 8 Enlarged schematic diagram of point D in the middle.

[0020] Fig.10 yes Figure 8 Cross-sectional view along the EE axis.

[0021] Fig.11 yes Fig.10 Enlarged schematic diagram of point F in the middle.

[0022] Fig.12 It is a schematic diagram of the structure of a battery pack according to an embodiment of the present invention.

[0023] Fig.13 yes Figure 5 Cross-sectional view along the GG axis.

[0024] Fig.14 yes Fig.13 Enlarged schematic diagram of point H in the middle.

[0025] In the figure, 1. box body; 2. battery unit; 3. heat exchange channel; 4. adhesive layer; 5. water inlet channel; 6. water outlet channel.

[0026] 11. Bottom plate; 12. Enclosure; 13. Accommodation cavity; 14. Crossbeam; 111. Accommodation groove; 112. Raised portion; 113. Bend groove; 131. Battery compartment; 132. Electrical compartment; 21. Battery pack; 211. Single cell; 31. Heat exchange tube; 32. Connecting elbow. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0031] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Please refer to Figure 1 , Figure 3 and Figure 7 A battery pack according to an embodiment of the present invention includes: a box body 1, a battery cell 2, a heat exchange tube 31 and a glue layer 4.

[0033] The box body 1 includes a bottom plate 11 and a surrounding plate 12 arranged on the edges of the bottom plate 11 . The bottom plate is used to place the battery unit 2 . The bottom plate 11 and the surrounding plate 12 form a receiving cavity 13 . The upper surface of the bottom plate 11 is provided with a receiving groove 111 .

[0034] Please refer to Figure 2 The heat exchange tube 31 is arranged in the containing tank 111, the depth of the containing tank 111 is H1 mm, and the height of the heat exchange tube 31 is H2 mm, wherein H1 ≥ H2.

[0035] The heat exchange tube 31 is used to exchange heat for the battery unit 2. The height of the heat exchange tube 31 refers to the maximum size of the heat exchange tube 31 in the depth direction of the receiving tank 111.

[0036] The battery unit 2 is disposed on the bottom plate 11 and above the heat exchange tube 31 , and the battery unit 2 is also disposed in the accommodating cavity 13 .

[0037] Through such a structure, when the heat exchange tube 31 is set in the receiving tank 111, the highest point of the heat exchange tube 31 is actually lower than the opening of the receiving tank 111, and the heat exchange tube 31 will not protrude to the outside of the receiving tank 111. In other words, there is a gap between the top of the heat exchange tube 31 and the opening height of the receiving tank 111.

[0038] Please refer to Figure 5 , Figure 6 and Figure 7 The glue layer 4 is disposed on the upper surface of the heat exchange tube 31 and is located between the heat exchange tube 31 and the battery unit 2. The battery unit 2 and the heat exchange tube 31 are connected by the glue layer 4. At least a part of the glue layer 4 is disposed in the receiving groove 111. The battery unit 2, the heat exchange tube 31 and the bottom plate 11 are glued and fixed by the glue layer 4. The glue layer 4 is heat-conducting so as to transfer the heat of the battery unit 2 to the heat exchange tube 31. In addition, the glue between the battery unit 2 and the heat exchange tube 31 forms the glue layer 4 after becoming solid.

[0039] It should be pointed out here that Figure 7 The glue layer 4 in the figure only expresses the position of the glue layer 4. In fact, the shape of the glue layer 4 is not as shown in the figure. Figure 7 The rubber layer 4 will contact the heat exchange tube 31 and may be squeezed into the left and right sides of the heat exchange tube 31.

[0040] In the battery pack of this embodiment, the heat of the battery cell 2 can be transferred to the heat exchange tube 31 through the glue layer 4, and the cooling water in the heat exchange tube 31 takes away the heat, thereby achieving heat exchange between the heat exchange tube 31 and the battery cell 2.

[0041] In the prior art, a liquid cooling plate is usually provided at the bottom of the battery unit 2 for heat exchange. The battery pack in this embodiment replaces the liquid cooling plate with a heat exchange tube 31 to achieve heat exchange of the battery unit 2 .

[0042] In addition, since H1≥H2, there is a gap between the highest point of the heat exchange tube 31 and the opening of the receiving groove 111. On the one hand, this can provide sufficient space for the glue layer 4 to prevent the glue layer 4 from causing the flatness of the connection plane between the bottom plate 11 and the bottom surface of the battery cell 2, thereby ensuring the connection strength and heat exchange effect. On the other hand, the heat exchange tube 31 will not directly rest against the bottom of the battery cell 2, thereby preventing the flatness of the connection plane between the bottom plate 11 and the bottom surface of the battery cell 2 from being affected, thereby ensuring the connection strength. Moreover, when the bottom plate 11 supports the battery cell 2, the bottom plate 11 around the receiving groove 111 plays a supporting role, thereby improving the impact resistance of the bottom of the battery pack. In addition, this can also reduce the pressure of the battery cell 2 on the heat exchange tube 31, thereby preventing the heat exchange tube 31 from being deformed due to the pressure of the battery cell 2, thereby ensuring the heat exchange effect.

[0043] In some embodiments, 0.5≤H2 / H1≤1.

[0044] When this range is met, the thickness of the adhesive layer 4 is appropriate and can ensure the flatness of the connection plane between the plate and the bottom surface of the battery unit 2. If the ratio H2 / H1 is too small, the depth of the receiving groove 111 is too deep, the gap between the highest point of the heat exchange tube 31 and the height of the opening of the receiving groove 111 is too large, and the thickness of the adhesive layer 4 is too thick, which affects the contact between the battery unit 2 and the heat exchange tube 31, and the heat exchange effect cannot be guaranteed; if the ratio H2 / H1 is too large, the thickness of the adhesive layer 4 is not enough, and the flatness of the bottom of the battery cannot be guaranteed.

[0045] When measuring H1 and H2, you can use common length measuring tools, such as rulers, tape measures, and vernier calipers.

[0046] The depth direction of the receiving groove 111 is also the vertical direction of the plate surface of the bottom plate 11 .

[0047] Specifically, when measuring H1, the plane of the bottom plate 11 facing the battery cell 2 is used as the reference edge, and the distance between the reference edge and the lowest point of the accommodating groove 111 is measured in the depth direction of the accommodating groove 111 by a length measuring tool. The measurement is performed multiple times and the average value is taken to obtain the depth H1mm of the accommodating groove 111.

[0048] When measuring H2, the distance between the two farthest points of the heat exchange tube 31 in the depth direction of the receiving tank 111 is measured by a length measuring tool, and the measurement is performed multiple times and the average value is taken to obtain the height H2 mm of the heat exchange tube 31 in the depth direction of the receiving tank 111. If the cross section of the heat exchange tube 31 is a perfect circle, H2 is the diameter of the heat exchange tube 31.

[0049] The heat transfer coefficient of the adhesive layer 4 is hW / m 2 K, satisfies: h / (H1- H2) ≥ 0.2.

[0050] When this range is met, the heat exchange effect of the heat exchange tube 31 can be ensured. If the value of (H1-H2) is too large and the heat exchange coefficient is small, it will affect the heat transfer of the battery unit 2 by the glue layer 4, thereby affecting the heat exchange effect.

[0051] The thickness of the bottom plate 11 is D1 mm, satisfying: 2≤H1 / D1≤10.

[0052] When this range is met, the heat exchange effect of the heat exchange tube 31 can be ensured while ensuring the strength of the bottom plate 11. If the value of H1 / D1 is too large, it will affect the strength of the bottom plate 11, and if the value of H1 / D1 is too small, it will affect the heat exchange effect of the heat exchange tube 31.

[0053] The thickness D1 of the bottom plate 11 is actually the dimension of the bottom plate 11 in the depth direction of the receiving groove 111 .

[0054] When measuring D1, a general length measuring tool can be used, such as a ruler, a tape measure, a vernier caliper, etc., with any of the two surfaces of the base plate 11 as the reference edge, and the distance between the reference edge and the other surface is measured. Measure multiple times and take the average value to obtain the thickness D1mm of the base plate 11.

[0055] Please refer to Fig.10 and Fig.11 , the maximum width of the containing groove 111 is D2 mm, and the width of the heat exchange tube 31 is D3 mm, satisfying: 1<D2 / D3≤2.5.

[0056] When this range is met, sufficient space can be provided for the adhesive layer 4, and the heat exchange efficiency and the connection strength between the heat exchange tube 31 and the battery unit 2 can be ensured. If the value of D2 / D3 is too small, there is insufficient space to accommodate the adhesive layer 4. If the value of D2 / D3 is too large, the size of the box 1 is limited, the number of channels for the heat exchange tube 31 that can be set is reduced, the heat exchange efficiency is low, and the space for accommodating the adhesive layer 4 is too large, which is not conducive to the connection strength between the heat exchange tube 31 and the battery unit 2.

[0057] The maximum width D2 of the receiving groove 111 refers to the maximum dimension of the receiving groove 111 in a direction perpendicular to the length of the receiving groove 111 .

[0058] The width D3 of the heat exchange tube 31 refers to the size of the heat exchange tube 31 in the width direction of the receiving tank 111 , which is also perpendicular to the length direction of the receiving tank 111 .

[0059] When measuring D2 and D3, general length measuring tools such as ruler, tape measure, and vernier caliper can be used.

[0060] When measuring D2, in the width direction of the receiving groove 111, that is, in the direction perpendicular to the axial direction of the heat exchange tube 31, one edge of the opening of the receiving groove 111 is taken as the reference edge, and the distance between the reference edge and the other edge is measured by a length measuring tool. The measurement is performed multiple times and the average value is taken to obtain the width D2mm of the receiving groove 111.

[0061] When measuring D3, the distance between the two farthest points of the heat exchange tube 31 in the width direction of the receiving groove 111 is measured by a length measuring tool, and the measurement is repeated multiple times and the average value is taken to obtain the width D3 mm of the heat exchange tube 31 in the width direction of the receiving groove 111. If the cross section of the heat exchange tube 31 is a perfect circle, D3 is the diameter of the heat exchange tube 31.

[0062] The number of the heat exchange tubes 31 is at least two. At least two heat exchange tubes 31 are sequentially arranged along the width direction of the containing tank 111. The heat exchange tubes 31 are parallel to each other, and two adjacent heat exchange tubes 31 are evenly spaced.

[0063] Please refer to Figure 8 and Fig. 9 , the distance between the center lines of two adjacent heat exchange tubes 31 is L mm, satisfying: 1.5≤L / D3≤8.

[0064] When this range is met, the battery pack can be lightweight while ensuring heat exchange efficiency. If the value of L / D3 is too large, the heat exchange efficiency of the heat exchange tube 31 to the battery cell 2 will be low; if the value of L / D3 is too small, the box 1 will be heavier, resulting in a waste of materials.

[0065] The distance L between the center lines of two adjacent heat exchange tubes 31 refers to the spacing distance between the center axes of two adjacent heat exchange tubes 31 in the width direction of the containing tank 111 .

[0066] There are at least two receiving grooves 111 , each receiving groove 111 is parallel to each other, and each receiving groove 111 is arranged in a one-to-one correspondence with each other. In other embodiments, at least two heat exchange tubes 31 may also be arranged in the same receiving groove 111 .

[0067] The bottom plate 11 is provided with a protrusion 112, which is located between two adjacent receiving grooves 111. In this embodiment, the height of the protrusion 112 cannot be lower than the surface of the bottom plate 11. When the protrusion 112 is higher than the surface of the bottom plate 11, the protrusion 112 plays the role of supporting the battery unit 2.

[0068] The height of the protrusion 112 is H3 mm, satisfying: 1≤H3 / H2≤2.5.

[0069] H3 expresses the distance between the deepest part of the receiving groove 111 and the surface of the protrusion 112 in the depth direction of the receiving groove 111 , and this distance is the height of the protrusion 112 .

[0070] When this range is met, the protrusion 112 can support the battery cell 2 and ensure the heat exchange efficiency. If the value of H3 / H2 is too large, the gap between the heat exchange tube 31 and the bottom surface of the battery cell 2 will be too large, which is not conducive to transferring the heat of the battery cell 2 to the heat exchange tube 31 through the glue layer 4, affecting the heat exchange efficiency. If the value of H3 / H2 is too small, the protrusion 112 cannot support the battery cell 2 well.

[0071] In this embodiment, the cross section of the receiving groove 111 along its depth direction is a shape that is larger at the top and smaller at the bottom. Specifically, in this embodiment, the cross section of the receiving groove 111 is a trumpet shape, and in other embodiments, it can also be a trapezoidal shape.

[0072] Please refer to Figure 3 and Figure 4 The battery pack further includes a connecting elbow 32 , which is disposed on the upper surface of the bottom plate 11 , and ends of two adjacent heat exchange tubes 31 located on the same side are connected via the connecting elbow 32 .

[0073] At least two heat exchange tubes 31 can ensure the heat exchange effect on the battery unit 2. The heat exchange tubes 31 are usually connected in series, and the heat exchange tubes 31 are parallel to each other, so a connecting elbow 32 is provided to connect the heat exchange tubes 31. In other words, the heat exchange tubes 31 and the connecting elbow 32 can also be regarded as one tube, and the direction of the tube is changed by the connecting elbow 32.

[0074] The connecting elbow 32 can be a separate part, and when in use, it is connected to the heat exchange tube 31. The connecting elbow 32 can also be integrally provided with the heat exchange tube 31, and the heat exchange tube 31 and the connecting elbow 32 are manufactured together.

[0075] Please refer to Fig.13 and Fig.14 The upper surface of the bottom plate 11 is also provided with a curved groove 113 connected to the accommodating groove 111, and the connecting curved pipe 32 is arranged in the curved groove 113. The depth of the curved groove 113 is H4mm, and the height of the connecting curved pipe 32 is H5mm, wherein H4>H5.

[0076] The adhesive layer 4 is also disposed between the connecting elbow 32 and the battery unit 2 , and the connecting elbow 32 and the battery unit 2 are connected via the adhesive layer 4 .

[0077] Since H4>H5, there is a gap between the highest point of the connecting elbow 32 and the opening of the curved groove 113, which can provide enough space for the adhesive layer 4 on the one hand, preventing the adhesive layer 4 from affecting the flatness of the connecting plane with the bottom surface of the battery cell 2, thereby ensuring the connection strength and heat exchange effect. On the other hand, the connecting elbow 32 will not directly abut the bottom of the battery cell 2, thereby preventing the flatness of the connecting plane between the bottom plate 11 and the bottom surface of the battery cell 2 from being affected, thereby ensuring the connection strength. It can also reduce the pressure of the battery cell 2 on the connecting elbow 32, thereby preventing the connecting elbow 32 from being deformed due to the pressure of the battery cell 2, thereby ensuring the heat exchange effect.

[0078] The height H5 of the connecting elbow 32 refers to the maximum dimension of the connecting elbow 32 in the depth direction of the receiving groove 111 .

[0079] Please refer to Fig.12 The battery unit 2 includes at least one column of battery packs 21 , and the projection of the connecting elbow 32 on the bottom plate 11 partially or completely overlaps with the projection of at least one end of the battery pack 21 on the bottom plate 11 .

[0080] When the number of the battery packs 21 is at least two, the battery packs 21 are arranged sequentially in the width direction of the receiving groove 111 .

[0081] The battery pack 21 is formed by arranging at least two single batteries 211 in a row in the extending direction of the receiving slot 111. Multiple rows of battery packs 21 can also form a battery module, and then at least two battery modules form a battery unit 2. Alternatively, multiple rows of battery packs 21 can directly form a battery unit 2.

[0082] The projection of the connecting elbow 32 on the bottom plate 11 partially or completely overlaps with the projection of at least one end of the battery pack 21 on the bottom plate 11. The cooling water in the connecting elbow 32 has a slower flow rate than the cooling water in the heat exchange tube 31, and the heat exchange efficiency is also lower than the heat exchange efficiency of the heat exchange tube 31. As for the single cells 211 at both ends of each battery pack 21, the space around them is larger than that of other single cells 211, so the heat dissipation space is also larger, and the heat exchange demand is relatively small. Therefore, the single cells 211 at both ends of each battery pack 21 are matched with the corresponding connecting elbow 32 to balance the heat exchange effect of the battery unit 2 as a whole.

[0083] In this embodiment, the connecting bend 32 is arc-shaped, has a width of D4 mm, and a radian of n1 rad, which satisfies: 3< D4 / n1<20.

[0084] When this range is met, the connecting elbow 32 can not only ensure the heat exchange effect, but also avoid excessive bending angles, thereby preventing damage to the heat exchange tube 31.

[0085] The width D4 of the connecting elbow 32 refers to the maximum radial dimension of the connecting elbow 32 in a direction parallel to the plane where the bottom plate 11 is located, and may also be the pipe diameter in the radial direction.

[0086] When measuring D4, you can use common length measuring tools, such as rulers, tape measures, and vernier calipers.

[0087] When measuring D4, in a direction parallel to the plane where the bottom plate 11 is located, which can also be a horizontal plane, measure the distance between the contour on the inner side of the bending direction and the contour on the other side, measure multiple times and take the average value to obtain the width D4mm of the connecting elbow 32. If the cross section of the connecting elbow 32 is a perfect circle, D4 ​​is the diameter of the connecting elbow 32.

[0088] In this embodiment, the curved groove 113 is arc-shaped, and the radian of the curved groove 113 is n2rad, which satisfies: 0 ≤n2<Π / 2.

[0089] When 0 ≤ n2 < Π / 2 is satisfied, the size of the curved groove 113 can be adapted to the connecting curved pipe 32 .

[0090] In this embodiment, the depth of the curved groove 113 is equal to the depth of the receiving groove 111, that is, H1 = H4. The connecting curved pipe 32 can also be set to the same height as the heat exchange pipe 31, that is, H2 = H5. This arrangement is easier to produce and process.

[0091] The heat exchange tube 31 and the connecting elbow 32 together form a heat exchange channel 3 , and a water inlet of the heat exchange channel 3 and a water outlet of the heat exchange channel 3 are located on the same side of the housing 1 .

[0092] Such an arrangement can facilitate the arrangement of the heat exchange flow channel 3 and also facilitate subsequent inspection and maintenance operations.

[0093] In this case, the depth H1 mm of the accommodation groove 111 and the height H2 mm of the heat exchange tube 31 also satisfy: 0.4≤ H2 / H1≤1.

[0094] Since the water inlet and the water outlet of the heat exchange channel 3 are located on the same side of the housing 1 , the heat exchange channel 3 can make the heat exchange effect on the battery unit 2 more uniform, so the height requirement of the heat exchange tube 31 can be relaxed.

[0095] The battery pack further includes a water inlet channel 5 and a water outlet channel 6 .

[0096] The water inlet channel 5 is connected to one end of the heat exchange channel 3 , and the water outlet channel 6 is connected to the other end of the heat exchange channel 3 .

[0097] The box body 1 also includes a crossbeam 14, which is arranged in the accommodating chamber 13. The crossbeam 14 divides the accommodating chamber 13 into a battery compartment 131 and an electrical compartment 132. The battery unit 2 and the heat exchange channel 3 are arranged in the battery compartment 131, and the water inlet channel 5 and the water outlet channel 6 are arranged in the electrical compartment 132.

[0098] The electrical compartment 132 is used to house the electrical components of the battery pack, and the water inlet channel 5 and the water outlet channel 6 can perform heat exchange for the electrical compartment.

[0099] In this embodiment, the heat exchange tube 31 is made of aluminum, and the bottom plate 11 is made of steel. This arrangement can ensure the overall strength of the box body 1 and the heat exchange effect of the heat exchange tube 31 on the battery unit 2 .

[0100] In this case, the depth H1 mm of the accommodation groove 111 and the height H2 mm of the heat exchange tube 31 also satisfy: 0.4≤ H2 / H1≤1.

[0101] Since aluminum has good heat transfer performance, the heat exchange tube 31 can have a better heat transfer effect, and the steel material can provide sufficient strength for the bottom plate 11, so the height requirement of the heat exchange tube 31 and the depth requirement of the receiving groove 111 can be relaxed.

[0102] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: include: A box body, comprising a bottom plate, the bottom plate is used to place the battery unit, and the upper surface of the bottom plate is provided with a receiving groove; A heat exchange tube, which is arranged in the receiving tank, the depth of the receiving tank is H1mm, the height of the heat exchange tube is H2mm, wherein H1≥H2, and the height of the heat exchange tube is the maximum dimension of the heat exchange tube in the depth direction of the receiving tank; The battery unit is located above the heat exchange tube; An adhesive layer, which is disposed between the heat exchange tube and the battery unit, wherein at least a portion of the adhesive layer is disposed in the receiving groove, and the battery unit, the heat exchange tube and the bottom plate are connected via the adhesive layer; The heat exchange tube is a circular tube and is provided in plurality, and at least a part of the adhesive layer is located on both sides of the heat exchange tube; The maximum width of the receiving groove is D2 mm, and the width of the heat exchange tube is D3 mm, satisfying: 1<D2 / D3≤2.5, and the width of the heat exchange tube is the dimension of the heat exchange tube in the width direction of the receiving groove.

2. The battery pack according to claim 1, characterized in that: The depth H1mm of the receiving groove and the height H2mm of the heat exchange tube also satisfy: 0.5≤H2 / H1≤1.

3. The battery pack according to claim 1, characterized in that: The heat transfer coefficient of the adhesive layer is hW / m 2 K, satisfies: h / (H1- H2) ≥ 0.

2.

4. The battery pack according to claim 1, characterized in that: The thickness of the bottom plate is D1 mm, satisfying: 2≤H1 / D1≤10.

5. The battery pack according to claim 1, characterized in that: The number of the heat exchange tubes is at least two, and at least two of the heat exchange tubes are arranged in sequence along the width direction of the containing tank, the heat exchange tubes are parallel to each other, and two adjacent heat exchange tubes are evenly spaced apart; The distance between the center lines of two adjacent heat exchange tubes is L mm, the width of the heat exchange tube is D3 mm, and satisfies: 1.5≤L / D3≤8. The width of the heat exchange tube is the dimension of the heat exchange tube in the width direction of the containing tank.

6. The battery pack according to claim 5, characterized in that: The number of the containing tanks is at least two, and the containing tanks are arranged in a one-to-one correspondence with the heat exchange tubes.

7. The battery pack according to claim 1, characterized in that: The bottom plate is provided with a protrusion, and the protrusion is located between two adjacent accommodating grooves; The height of the protrusion is H3 mm, satisfying: 1≤H3 / H2≤2.5, and the height of the protrusion is the dimension of the protrusion in the depth direction of the receiving groove.

8. The battery pack according to claim 1, characterized in that: The cross section of the receiving groove along its depth direction is in a shape that is larger at the top and smaller at the bottom.

9. The battery pack according to claim 5, characterized in that: Also includes: A connecting elbow is arranged on the upper surface of the bottom plate, and ends of two adjacent heat exchange tubes located on the same side are connected through the connecting elbow.

10. The battery pack according to claim 9, characterized in that: The upper surface of the base plate is also provided with a bend groove connected to the accommodating groove, and the connecting bend pipe is arranged in the bend groove. The depth of the bend groove is H4mm, and the height of the connecting bend pipe is H5mm, wherein H4>H5, and the height of the connecting bend pipe is the maximum dimension of the connecting bend pipe in the depth direction of the accommodating groove.

11. The battery pack according to claim 9, characterized in that: The battery unit comprises at least one row of battery packs, and the projection of the connecting elbow on the bottom plate partially or completely overlaps with the projection of at least one end of the battery pack on the bottom plate.

12. The battery pack according to claim 9, characterized in that: The connecting elbow is arc-shaped; The width of the connecting bend is D4 mm, the curvature of the connecting bend is n1 rad, and the following conditions are satisfied: 3< D4 / n1<20. The width of the connecting bend is the maximum radial dimension of the connecting bend in a direction parallel to the plane where the bottom plate is located.

13. The battery pack according to claim 10, characterized in that: The curved groove is arc-shaped, and the radian of the curved groove is n2rad, which satisfies: 0≤n2≤Π / 2.

14. The battery pack according to claim 9, characterized in that: The heat exchange tube and the connecting elbow together form a heat exchange channel, and the water inlet and the water outlet of the heat exchange channel are located on the same side of the box body; The depth H1mm of the containing groove and the height H2mm of the heat exchange tube also satisfy: 0.4≤H2 / H1≤1.

15. The battery pack according to claim 1, characterized in that: The box body further comprises a surrounding plate, which is arranged on the four edges of the bottom plate. The bottom plate and the surrounding plate form a receiving cavity, and the battery unit is arranged in the receiving cavity.

16. The battery pack according to claim 15, characterized in that: Also includes: A water inlet channel connected to the water inlet; A water outlet channel connected to the water outlet; The box body also includes a crossbeam, which is arranged in the accommodating cavity. The crossbeam divides the accommodating cavity into a battery compartment and an electrical compartment. The battery unit and the heat exchange channel are arranged in the battery compartment, and the water inlet channel and the water outlet channel are arranged in the electrical compartment.

17. The battery pack according to claim 1, characterized in that: The material of the heat exchange tube includes aluminum, and the material of the bottom plate includes steel.

18. The battery pack according to claim 17, characterized in that: The depth H1mm of the containing groove and the height H2mm of the heat exchange tube also satisfy: 0.4≤H2 / H1≤1.

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