Battery pack

Abstract

Battery pack, including: a battery unit; a housing body comprising a base plate, wherein the base plate is designed to receive the battery unit and wherein the base plate is provided on an upper surface or top side with a receiving groove; and a heat exchanger tube provided within the receiving groove, wherein the maximum width of the receiving groove is D2 mm and the width of the heat exchanger tube is D3 mm, wherein 1 <D2 / D3≤2,5 erfüllt ist, wobei die Breite des Wärmetauscherrohrs der Abmessung des Wärmetauscherrohrs in der Breitenrichtung der Aufnahmenut entspricht; wobei the battery unit is located above the heat exchanger tube, and A gap is formed between the top of the heat exchanger tube and the height of an opening in the receiving groove.

Description

Technical field

[0001] The present application relates to the technical field of new energy batteries, in particular a battery pack. Technical background

[0002] Currently, to cool the battery, the battery casing is typically equipped with a liquid cooling plate on the underside, which is in contact with the battery. The liquid cooling plate incorporates a flow channel for the cooling medium, the molding process is complex, and the thickness of the liquid cooling plate itself is relatively low, resulting in a less than ideal heat exchange effect with the battery. Content of the invention

[0003] The purpose of the present application is to provide a battery pack that ensures flatness at the connection point between the housing body and the underside of the battery and guarantees the heat exchange effect on the battery.

[0004] To achieve the above purpose, the present application provides a battery pack comprising the following: a housing body comprising a base plate, the base plate being used to accommodate a battery unit, the base plate being provided with a receiving groove on an upper surface; a heat exchanger tube provided within the receiving groove, wherein the maximum width of the receiving groove is D2 mm, wherein the width of the heat exchanger tube is D3 mm, wherein 1 <D2 / D3≤2,5 erfüllt ist, wobei die Breite des Wärmetauscherrohrs die Abmessung des Wärmetauscherrohrs in der Breitenrichtung der Aufnahmenut ist; the battery unit, which is located above the heat exchanger tube.

[0005] The present application provides a battery pack which, compared to the prior art, has the following advantageous effects:

[0006] The battery pack of the present application comprises a housing body, a battery unit, a heat exchanger tube, and an adhesive layer. A receiving groove is provided on the base plate of the housing body, and the heat exchanger tube is provided in the receiving groove. This structure replaces the liquid cooling plate in the prior art and uses the heat exchanger tube for heat exchange with the battery unit. The maximum width of the receiving groove is D2 mm, and the width of the heat exchanger tube is D3 mm. <D2 / D3≤2,5 erfüllt, was ausreichend Raum für die Klebeschicht zur Verfügung stellt und auch die Wärmeaustauscheffizienz und die Festigkeit der Verbindung zwischen dem Wärmetauscherrohr und der Batterieeinheit gewährleistet.. Figure overview Fig. Figure 1 shows a schematic representation of the internal structure of a battery pack in an embodiment of the present application. Fig. Figure 2 shows a schematic representation of a structure in which a heat exchanger tube is provided inside a housing body, in an embodiment of the present application. Fig. Figure 3 shows a schematic representation of a structure in which the housing body is not provided with a heat exchanger tube, in an embodiment of the present application. Fig. Figure 4 shows an enlarged schematic representation at A in Fig. 3. Fig. Figure 5 shows a front view when the housing body is provided with a heat exchanger tube, in an embodiment of the present application. Fig. Figure 6 shows a cross-sectional view of the BB direction in Fig. 5. Fig. Figure 7 shows an enlarged schematic representation at C in Fig. 6. Fig. Figure 8 shows a schematic representation of the structure of a heat exchanger tube, a water inlet channel and a water outlet channel in an embodiment of the present application. Fig. Figure 9 shows an enlarged schematic representation at D in Fig. 8. Fig. Figure 10 shows a cross-sectional view of the EE direction in Fig. 8. Fig. Figure 11 shows an enlarged schematic representation at F in Fig. 10. Fig. Figure 12 shows a schematic representation of the structure of a battery group in an embodiment of the present application. Fig. Figure 13 shows a cross-sectional view of the GG direction in Fig. 5. Fig. Figure 14 shows an enlarged schematic representation at H in Fig. 13.

[0007] Reference symbol list: 1. Housing body; 2. Battery unit; 3. Heat exchanger channel; 4. Adhesive layer; 5. Water inlet channel; 6. Water outlet channel. 11. Base plate; 12. Enclosing plate; 13. Receiving cavity; 14. Cross member; 111. Receiving groove; 112. Projecting section; 113. Bending groove; 131. Battery compartment; 132. Electrical compartment; 21. Battery group; 211. Battery cell; 31. Heat exchanger tube; 32. Bent connecting tube. Description of embodiments

[0008] The specific embodiments of the present application are described in more detail below in conjunction with the accompanying drawings and examples. The following examples serve to illustrate the present application but are not intended to limit its scope.

[0009] In the description of this application, it should be understood that the terms, e.g., "middle," "longitudinal," "transverse," "top," "bottom," "front," "rear," "left," "right," "vertical," "horizontal," "above," "below," "within," "outside," which indicate the orientation or positional relationship, are based on the orientation or positional relationship shown in the attached drawings, serve only for the sake of simplicity and to simplify the description of this application, and do not indicate or imply that the device or element referred to must have a particular orientation or be designed and operated with a particular orientation, and are therefore not to be understood as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be understood as indicating or implying any relative meaning.

[0010] In the description of this application, it should be noted that the terms, e.g., "mounted," "connected," "fastened," unless expressly stated otherwise and limited, are to be understood broadly, e.g., as either a permanent connection, a detachable connection, or a connection in one piece; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium, or a connection within two elements. The specific meaning of the above-mentioned terms in this application is clear to a person competent in the field.

[0011] In the description of this application, “a plurality of” means two or more, unless expressly defined otherwise.

[0012] For a competent person, the specific meaning of the above-mentioned terms in the present application is clear.

[0013] As in Fig. 1, Fig. 3 and Fig. As shown in Figure 7, the battery pack according to the embodiments of the present application comprises a housing body 1, a battery unit 2, a heat exchanger tube 31 and an adhesive layer 4.

[0014] The housing body 1 comprises a base plate 11 and a surrounding plate 12, which are provided on a circumferential edge of the base plate 11, the base plate is used to receive the battery unit 2, the base plate 11 and the surrounding plate 12 form a receiving cavity 13, and the base plate 11 is provided on an upper surface with a receiving groove 111.

[0015] As in Fig. As shown in Figure 2, the heat exchanger tube 31 is provided within the receiving groove 111, wherein the depth of the receiving groove 111 is H1 mm and the height of the heat exchanger tube 31 is H2 mm, where H1≥H2;

[0016] The heat exchanger tube 31 is used for heat exchange for the battery unit 2. The height of the heat exchanger tube 31 refers to the maximum dimension of the heat exchanger tube 31 in the depth direction of the receiving groove 111.

[0017] The battery unit 2 is provided on the base plate 11 and is located above the heat exchanger tube 31, and the battery unit 2 is also located in the receiving cavity 13.

[0018] In such a structure, when the heat exchanger tube 31 is provided in the receiving groove 111, the highest point of the heat exchanger tube 31 is actually lower than the opening of the receiving groove 111, and the heat exchanger tube 31 does not protrude beyond the outside of the receiving groove 111; in other words, there is a gap between the top of the heat exchanger tube 31 and the height of the opening of the receiving groove 111.

[0019] As in Fig. 5, Fig. 6 and Fig. As shown in Figure 7, the adhesive layer 4 is provided on the upper surface of the heat exchanger tube 31 and is located between the heat exchanger tube 31 and the battery unit 2. The battery unit 2 and the heat exchanger tube 31 are connected to each other by the adhesive layer 4. The adhesive layer 4 is at least partially provided in the receiving groove 111, and the battery unit 2, the heat exchanger tube 31, and the base plate 11 are bonded and secured by the adhesive layer 4. The adhesive layer 4 is heat-conducting to facilitate heat transfer from the battery unit 2 to the heat exchanger tube 31. Furthermore, the adhesive between the battery unit 2 and the heat exchanger tube 31 forms the adhesive layer 4 after it has hardened.

[0020] It should be noted here that the adhesive layer 4 in Fig. 7 only represents the position of the adhesive layer 4, and that the shape of the adhesive layer 4 is not actually as regular as shown. Fig. 7, and that the adhesive layer 4 touches the heat exchanger tubes 31 and can be squeezed into the positions on the left and right sides of the heat exchanger tubes 31.

[0021] In the battery pack of this embodiment, the heat from the battery unit 2 can be transferred via the adhesive layer 4 to the heat exchanger tube 31, and the cooling water in the heat exchanger tube 31 carries away the heat, so that the heat exchange of the battery unit 2 is realized through the heat exchanger tube 31.

[0022] In the prior art, the underside of the battery unit 2 is usually provided with a liquid cooling plate for heat exchange, and the battery pack in this embodiment replaces the liquid cooling plate with the heat exchanger tube 31 to achieve heat exchange with the battery unit 2.

[0023] Since H1 ≥ H2, there is also a gap between the highest point of the heat exchanger tube 31 and the opening of the receiving groove 111. This provides sufficient space for the adhesive layer 4 to prevent any unevenness of the contact surface between the base plate 11 and the underside of the battery unit 2 caused by the adhesive layer 4, thus ensuring the strength of the connection and the heat exchange effect. Furthermore, the heat exchanger tube 31 does not directly contact the underside of the battery unit 2, preventing any impairment of the flatness of the contact surface between the base plate 11 and the underside of the battery unit 2 and ensuring the strength of the connection. In addition, the base plate 11 plays a supporting role in securing the battery unit 2 around the receiving groove 111, thereby improving the impact resistance of the underside of the battery pack.This can also reduce the pressure of the battery unit 2 on the heat exchanger tube 31, prevent deformation of the heat exchanger tube 31 due to the pressure of the battery unit 2 and ensure the heat exchange effect.

[0024] In some embodiments, 0.5≤H2 / H1≤1.

[0025] If this range is maintained, the thickness of the adhesive layer 4 is appropriate and the flatness of the connection surface between the base plate and the underside of the battery unit 2 can be ensured. 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 exchanger 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 impairs the contact between the battery unit 2 and the heat exchanger tube 31, and the heat exchange effect is not guaranteed. If the ratio H2 / H1 is too large, the thickness of the adhesive layer 4 may be too small to ensure the flatness of the underside of the battery.

[0026] When measuring H1 and H2, it is sufficient to use a general length measuring tool, such as a ruler, a scale, a caliper and similar measuring tools.

[0027] The depth direction of the receiving groove 111 is also the vertical direction of the plate surface of the base plate 11.

[0028] When measuring H1, the plane of the base plate 11 facing the battery unit 2 is taken as a reference edge, and the distance between the reference edge and the lowest point of the receiving groove 111 is measured in the depth direction of the receiving groove 111 using the length measuring tool, and the depth of the receiving groove 111 is determined by forming the average of several measurements and determining the depth of the receiving groove 111 in H1 mm.

[0029] To measure H2, a distance between the two furthest points of the heat exchanger tube 31 in the depth direction of the receiving groove 111 is measured with a length measuring tool, measured several times and averaged to obtain a height H2 mm of the heat exchanger tube 31 in the depth direction of the receiving groove 111. If the cross-section of the heat exchanger tube 31 is positively circular, H2 is the diameter of the heat exchanger tube 31.

[0030] The heat exchange coefficient of the adhesive layer 4 is h W / m 2 K, where h / (H1-H2)≥0.2 is satisfied.

[0031] If this range is maintained, the heat exchange efficiency of the heat exchanger tube 31 can be ensured. If the value of (H1-H2) is too high and the heat exchange coefficient is low, the heat transfer from the adhesive layer 4 to the battery unit 2 will be impaired, thus reducing the heat exchange efficiency.

[0032] The thickness of the base plate 11 is D1 mm, where 2≤H1 / D1≤10 is satisfied.

[0033] If this range is maintained, the strength of the base plate 11 can be ensured while simultaneously guaranteeing the heat exchange efficiency of the heat exchanger tube 31. If the value of H1 / D1 is too high, the strength of the base plate 11 will be compromised, and if the value of H1 / D1 is too low, the heat exchange efficiency of the heat exchanger tube 31 will be compromised.

[0034] The thickness D1 of the base plate 11 is actually the dimension of the base plate 11 in the depth direction of the receiving groove 111.

[0035] When measuring D1, a universal length measuring tool can be used, such as a ruler, a scale, a caliper and the like, to take one of the two plate surfaces of the base plate 11 as a reference edge, measure the distance between the reference edge and the other plate surface, and take a series of measurements and determine the average value to obtain the thickness D1 mm of the base plate 11.

[0036] As in the Fig. 10 and Fig. As shown in Figure 11, the maximum width of the receiving groove is 111 D2 mm and the width of the heat exchanger tube is 31 D3 mm, where 1 <D2 / D3≤2,5 erfüllt ist.

[0037] If this range is maintained, sufficient space can be provided for the adhesive layer 4, ensuring both heat exchange efficiency and the bond strength between the heat exchanger tube 31 and the battery unit 2. If the D2 / D3 value is too small, the space for the adhesive layer 4 will be insufficient. Conversely, if the D2 / D3 value is too large and the dimensions of the housing 1 are limited, fewer channels can be provided in the heat exchanger tube 31, the heat exchange efficiency will be lower, and the space for the adhesive layer 4 will be too large, negatively impacting the bond strength between the heat exchanger tube 31 and the battery unit 2.

[0038] 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 longitudinal direction of the receiving groove 111.

[0039] The width D3 of the heat exchanger tube 31 refers to a dimension of the heat exchanger tube 31 in the width direction of the receiving groove 111 and also in a direction perpendicular to the length direction of the receiving groove 111.

[0040] For measuring D2 and D3, a general length measuring tool is sufficient, such as a ruler, a scale, a caliper, and the like.

[0041] During measurement D2, in the width direction of the receiving groove 111, i.e. in the direction perpendicular to the axial direction of the heat exchanger tube 31, an edge at the opening of the receiving groove 111 is taken as a reference edge, and the distance between the reference edge and the other edge is measured with the length measuring tool, and the distance between the reference edge and the other edge is measured several times and taken as an average value to obtain the width of the receiving groove 111 D2 mm.

[0042] In measurement D3, the distance between the two furthest points of the heat exchanger tube 31 is measured with the length measuring tool in the width direction of the receiving groove 111. This distance is measured several times and averaged, yielding the width of the heat exchanger tube 31 in the width direction of the receiving groove 111, D3 mm. If the cross-section of the heat exchanger tube 31 is positively circular, then D3 is the diameter of the heat exchanger tube 31.

[0043] The number of heat exchanger tubes 31 is at least two, wherein at least two of the heat exchanger tubes 31 are arranged successively along the width direction of the receiving groove 111, wherein each of the heat exchanger tubes 31 runs parallel to each other, wherein two adjacent heat exchanger tubes 31 are arranged at equal intervals;

[0044] As in the Fig. 8 and Fig. As shown in Figure 9, the distance between the respective center lines of the two adjacent heat exchanger tubes is 31 L mm, where 1.5 ≤ L / D3 ≤ 8 is satisfied.

[0045] If this range is maintained, it is possible to ensure heat exchange efficiency while simultaneously achieving the low weight of the battery pack. If the L / D3 value is too high, the heat exchange efficiency of the heat exchanger tube 31 to the battery unit 2 is low; if the L / D3 value is too low, the housing body 1 is heavier, leading to material waste.

[0046] The distance L between the respective center lines of the two adjacent heat exchanger tubes 31 refers to the distance between the center axes of the two adjacent heat exchanger tubes 31 in the width direction of the receiving groove 111.

[0047] The number of receiving grooves 111 is at least two; the respective receiving grooves 111 are parallel to each other, and the receiving grooves 111 are aligned one-to-one with the heat exchanger tubes 31. In other embodiments, it is also possible to receive at least two heat exchanger tubes 31 in the same receiving groove 111.

[0048] The base plate 11 is provided with a projecting section 112 located between two adjacent receiving grooves 111. In this embodiment, the height of the projecting section 112 cannot be less than the surface of the base plate 11. If the projecting section 112 is higher than the surface of the base plate 11, it assumes a supporting role for the battery unit 2.

[0049] The height of the projection section 112 is H3 mm, where 1≤H3 / H2≤2.5 is satisfied.

[0050] H3 represents the distance between the lowest point of the receiving groove 111 and a surface of the projection section 112 in the depth direction of the receiving groove 111, where this distance is a height of the projection section 112.

[0051] If this range is maintained, the protruding section 112 can play a supporting role for battery unit 2 and also ensure heat exchange efficiency. If the H3 / H2 value is too high, the gap between the heat exchanger tube 31 and the underside of battery unit 2 is too large, which hinders the transfer of heat from battery unit 2 to the heat exchanger tube 31 via the adhesive layer 4 and impairs heat exchange efficiency. If the H3 / H2 value is too low, the protruding section 112 cannot play a sufficient supporting role for battery unit 2.

[0052] In this embodiment, the cross-section of the receiving groove 111 has a shape with a large upper surface and a small lower surface along the depth direction. In particular, the cross-section of the receiving groove 111 is widened in this embodiment, and in other embodiments it may also be trapezoidal or similar.

[0053] As in Fig. 3, Fig. 4, Fig. 8 and Fig. As shown in Figure 9, the battery pack further comprises a curved connecting tube 32, wherein the curved connecting tube 32 is provided on an upper surface of the base plate 11, wherein two end sections of the adjacent heat exchanger tubes 31, each located on the same side, are connected by the curved connecting tube 32.

[0054] At least two heat exchanger tubes 31 can ensure the heat exchange effect for the battery unit 2. The individual heat exchanger tubes 31 are typically connected in series, and the individual heat exchanger tubes 31 are parallel to each other, so that the curved connecting tube 32 is provided to connect the individual heat exchanger tubes 31. In other words, the individual heat exchanger tubes 31 and the curved connecting tube 32 can also be considered as one tube, and the direction of the tube is changed by the individual curved connecting tubes 32.

[0055] The curved connecting pipe 32 can be a separate component used in conjunction with the heat exchanger tubes 31 during operation. Alternatively, the curved connecting pipe 32 can be integrated with the heat exchanger tube 31 as a single unit, with the heat exchanger tube 31 being manufactured together with the curved connecting pipe 32.

[0056] As in Fig. 13 and Fig. As shown in Figure 14, the base plate 11 is further provided on its upper surface with a bending groove 113 which is connected to the receiving groove 111, wherein the bent connecting tube 32 is provided in the bending groove 113, wherein the depth of the bending groove 113 is H4 mm and the height of the bent connecting tube 32 is H5 mm, where H4>H5.

[0057] The adhesive layer 4 is also provided between the curved connecting tube 32 and the battery unit 2, wherein the curved connecting tube 32 and the battery unit 2 are connected to each other by the adhesive layer 4.

[0058] Since H4 ≥ H5, a gap exists between the highest point of the bent connecting tube 32 and the opening of the bending groove 113. This provides sufficient space for the adhesive layer 4, preventing it from affecting the flatness of the connection surface with the underside of the battery unit 2 and ensuring the strength of the connection and the heat exchange effect. Furthermore, the bent connecting tube 32 does not directly contact the underside of the battery unit 2, thus preventing any impairment of the flatness of the connection surface between the base plate 11 and the underside of the battery unit 2 and ensuring the connection strength. This also reduces the pressure exerted by the battery unit 2 on the bent connecting tube 32, preventing deformation of the bent connecting tube 32 due to this pressure and ensuring the heat exchange effect.

[0059] The height H5 of the bent connecting tube 32 refers to the maximum dimension of the bent connecting tube 32 in the depth direction of the receiving groove 111.

[0060] As in Fig. As shown in Figure 12, the battery unit 2 comprises at least one series of battery groups 21, wherein the projection of the curved connecting tube 32 on the base plate 11 coincides completely or partially with the projection of at least one end of the battery group 21 on the base plate 11.

[0061] If the number of battery groups 21 is at least two, the battery groups 21 are arranged consecutively in the width direction of the receiving groove 111.

[0062] The battery group 21 is configured as at least two battery cells 211 arranged in a row along the extension of the receiving groove 111. The multi-row battery group 21 can also be configured as a battery module, which in turn forms the battery unit 2 from the at least two battery modules. It is also possible for the multiple rows of battery groups 21 to directly form the battery units 2.

[0063] The projection of the curved connecting tube 32 onto the base plate 11 coincides completely or partially with the projection of at least one end of the battery group 21 onto the base plate 11. The cooling water in the curved connecting tube 32 has a lower flow velocity than the cooling water in the heat exchanger tube 31, and the heat exchange efficiency is lower than that of the heat exchanger tube 31. Regarding the battery cell 211 at both ends of each battery group 21, the space around it is larger compared to the other battery cells 211, and thus the space for heat dissipation is also larger, so the heat exchange requirement is lower. Therefore, the battery cell 211 at the ends of each battery group 21 is positioned to align with the corresponding curved connecting tube 32 in order to compensate for the overall heat exchange effect of the battery unit 2.

[0064] In this embodiment, the bent connecting tube is curved. The width of the bent connecting tube 32 is D4 mm, the curvature of the bent connecting tube 32 is n1 rad, where 3 <D4 / n1<20 erfüllt ist.

[0065] If this range is maintained, the curved connecting pipe 32 is able to ensure the heat exchange effect, but also avoid an excessively large bending angle in order to prevent damage to the heat exchanger pipe 31.

[0066] The width of the bent connecting tube 32 of D4 refers to the maximum radial dimension of the bent connecting tube 32 in the direction parallel to the plane in which the base plate 11 is located, which can also be the diameter of the tube in the radial direction.

[0067] For measuring D4, a general length measuring tool is sufficient, such as a ruler, a scale, a caliper, and the like.

[0068] When measuring D4, the distance between the contour near the inside of the bending direction and the contour on the other side is measured in a direction parallel to the plane in which the base plate 11 is located (which can also be a horizontal plane). This measurement is repeated several times and averaged to obtain the width of the bent connecting tube 32, D4 mm. If the cross-section of the bent connecting tube 32 is positively round, then D4 is the diameter of the bent connecting tube 32.

[0069] In this embodiment, the bending groove is curved, with the curvature of the bending groove being recorded as n2 rad, where 0≤n2≤π / 2 is satisfied.

[0070] If 0≤n2<π / 2 is satisfied, the dimensions of the bending groove 113 can be adapted to the bent connecting tube 32.

[0071] In this embodiment, the depth of the bending groove 113 is equal to the depth of the receiving groove 111, i.e., H1 = H4. The bent connecting pipe 32 can also be adjusted so that it has the same height as the heat exchanger pipe 31, i.e., H2 = H5. This makes it easier to manufacture and process.

[0072] The heat exchanger tube 31 and the curved connecting tube 32 together form the heat exchanger channel 3, and the water inlet of the heat exchanger channel 3 and the water outlet of the heat exchanger channel 3 are located on the same side of the housing body 1.

[0073] In this way, the arrangement of the heat exchanger channel 3 can be simplified and also facilitates subsequent overhaul and maintenance work.

[0074] In this case, the depth H1 mm of the receiving groove 111 and the height H2 mm of the heat exchanger channel 31 also correspond to: 0.4≤H2 / H1≤1.

[0075] Since the water inlet of the heat exchanger channel 3 and the water outlet of the heat exchanger channel 3 are located on the same side of the housing body 1, the heat exchanger channel 3 allows for a more uniform heat exchange effect on the battery unit 2, so that the height requirement for the heat exchanger tube 31 can be reduced.

[0076] The battery pack also includes a water inlet channel 5 and a water outlet channel 6.

[0077] The water inlet channel 5 is connected to one end of the heat exchanger channel 3, the water outlet channel 6 is connected to the other end of the heat exchanger channel 3.

[0078] The housing body 1 further comprises a cross member 14, wherein the cross member 14 is provided in the receiving cavity 13, wherein the cross member 14 divides the receiving cavity 13 into a battery compartment 131 and an electrical compartment 132, wherein the battery unit 2 and the heat exchanger channel 3 are provided in the battery compartment 131, and wherein the water inlet channel 5 and the water outlet channel 6 are provided in the electrical compartment 132.

[0079] 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 are able to exchange heat for the electrical compartment.

[0080] In this embodiment, the material of the heat exchanger tubes 31 comprises aluminum, while the material of the base plate 11 comprises steel. This ensures the overall strength of the housing body 1 and guarantees the heat exchange effect of the heat exchanger tubes 31 on the battery unit 2.

[0081] In this case, the depth H1 mm of the receiving groove 111 and the height H2 mm of the heat exchanger tube 31 also satisfy: 0.4≤H2 / H1≤1.

[0082] Since the aluminum has a better heat exchange efficiency and allows the heat exchanger tube 31 to have a better heat exchange, and the steel material can provide sufficient strength for the base plate 11, the requirements for the height of the heat exchanger tube 31 and the depth of the receiving groove 111 can be reduced.

[0083] The foregoing is only a preferred embodiment of the present application, and it should be noted that for a person of ordinary knowledge in the field, a number of improvements and embellishments can be made without derogation from the principles of the present application, and these improvements and embellishments should also be regarded as being within the scope of protection of the present application.

Claims

[1] Battery pack, comprising: a battery unit; a housing body comprising a base plate, wherein the base plate is designed to receive the battery unit and wherein the base plate is provided on an upper surface or top side with a receiving groove; and a heat exchanger tube provided within the receiving groove, wherein the maximum width of the receiving groove is D2 mm and the width of the heat exchanger tube is D3 mm, wherein 1 <D2 / D3≤2,5 erfüllt ist, wobei die Breite des Wärmetauscherrohrs der Abmessung des Wärmetauscherrohrs in der Breitenrichtung der Aufnahmenut entspricht; wobei the battery unit is located above the heat exchanger tube, and A gap is formed between the top of the heat exchanger tube and the height of an opening in the receiving groove. [2] Battery pack according to claim 1, wherein the depth of the receiving groove H1 mm and the height of the heat exchanger tube H2 mm further satisfy the following condition: 0.5≤H2 / H1<1. [3] Battery pack according to claim 1 or 2, wherein the battery pack further comprises an adhesive layer, wherein the adhesive layer is provided between the heat exchanger tube and the battery unit, wherein the battery unit, the heat exchanger tube and the base plate are connected to each other by the adhesive layer. [4] Battery pack according to one of the preceding claims, wherein the thickness of the base plate is D1 mm, where 2≤H1 / D1 ≤10 is satisfied. [5] Battery pack according to any of the preceding claims , wherein the number of heat exchanger tubes is at least two, wherein at least two of the heat exchanger tubes are arranged consecutively along the width direction of the receiving groove, each of the heat exchanger tubes running parallel to each other, with two adjacent heat exchanger tubes being arranged at equal intervals; wherein the distance between the respective center lines of two adjacent heat exchanger tubes is L mm, wherein the width of the heat exchanger tubes is D3 mm, wherein 1.5≤L / D3≤8 is satisfied, wherein the width of the heat exchanger tubes is the dimension of the heat exchanger tubes in the width direction of the receiving groove or corresponds to it. [6] Battery pack according to claim 5, wherein the number of receiving slots is at least two, wherein the receiving slots are provided one-to-one with the heat exchanger tube. [7] Battery pack according to one of the preceding claims, wherein the base plate is provided with a projection section, the projection section being located between two adjacent receiving grooves; wherein the height of the projection section is H3 mm, wherein the condition 1≤H3 / H2≤2.5 is satisfied, wherein the height of the projection section is the dimension of the projection section in a depth direction of the receiving groove or corresponds to it. [8] Battery pack according to one of the preceding claims, wherein a section of the receiving groove in the depth direction has a shape having a large top and a small bottom. [9] Battery pack according to any one of the preceding claims, wherein the battery pack further comprises: a curved connecting tube provided on an upper surface or top of the base plate, wherein two end sections of the adjacent heat exchanger tubes, which are located on the same side, are connected to each other by the curved connecting tube. [10] Battery pack according to claim 9, wherein the base plate is further provided on the upper surface with a bending groove which is connected to the receiving groove, wherein the bent connecting tube is provided in the bending groove, wherein the depth of the bending groove is H4 mm and the height of the bent connecting tube is H5 mm, wherein the condition H4>H5 is satisfied, wherein the height of the bent connecting tube is the maximum dimension of the bent connecting tube in the depth direction of the receiving groove. [11] Battery pack according to claim 9 or 10, wherein the battery unit comprises at least one series of battery groups, wherein a projection of the curved connecting tube on the base plate coincides completely or partially with a projection of at least one end of the battery groups on the base plate. [12] Battery pack according to any one of claims 9 to 11, wherein the bent connecting pipe is curved; where the width of the bent connecting tube is D4 mm, where the curvature of the bent connecting tube is n1 rad, where condition 3 <d4 n1<20 erfüllt ist, wobei die breite des gebogenen verbindungsrohrs maximale radiale abmessung in einer richtung ist bzw. dieser entspricht, parallel zu der ebene sich grundplatte befindet.[13] Battery pack according to one of claims 10 to 12, wherein the bending groove is curved, wherein the curvature of the bending groove is n2 rad, wherein the condition 0≤n2≤π / 2 is satisfied. [14] Battery pack according to any one of claims 9 to 13, wherein the heat exchanger tube and the curved connecting tube together form a heat exchanger channel, with a water inlet of the heat exchanger channel and a water outlet of the heat exchanger channel being located on the same side of the housing body; where the depth H1 mm of the receiving groove and the height H2 mm of the heat exchanger tube further satisfy the following relationship: 0.4≤H2 / H1≤1. [15] Battery pack according to one of the preceding claims, wherein the housing body further comprises an enclosure plate, wherein the enclosure plate is provided on a circumferential edge of the base plate, wherein the base plate and the enclosure plate form a receiving cavity, wherein the battery unit is provided in the receiving cavity. [16] Battery pack according to claim 15, further comprising: a water inlet channel connected to the water inlet; a water outlet channel connected to the water outlet; wherein the housing body further comprises a cross member, wherein the cross member is provided in the receiving cavity, wherein the cross member divides the receiving cavity into a battery compartment and an electrical compartment, wherein the battery unit and the heat exchanger channel are provided in the battery compartment, and wherein the water inlet channel and the water outlet channel are provided in the electrical compartment. [17] Battery pack according to any of the preceding claims, wherein the material of the heat exchanger tubes comprises or is aluminium and the material of the base plate comprises or is steel. [18] Battery pack according to claim 17, wherein the depth H1 mm of the receiving groove and the height H2 mm of the heat exchanger tube further satisfy the following condition: 0.4≤H2 / H1≤1. [19] Battery pack according to claim 3, wherein at least a part of the adhesive layer is provided in the receiving groove. [20] Battery pack according to any one of claims 1 to 18, wherein the heat exchanger tube is a round tube. [21] Battery pack according to claim 20, wherein the round tube is a positively round tube or is designed with a positive curvature. [22] Battery pack according to claim 3, wherein the adhesive layer is a thermally conductive structure to conduct heat from the battery unit to the heat exchanger tube. [23] Battery pack according to claim 3, wherein at least a part of the adhesive layer is located on a left and a right side of the heat exchanger tube. [24] Battery pack according to one of the preceding claims, wherein the base plate is provided with a projection section, wherein the projection section is located between two adjacent receiving grooves, wherein the height of the projection section is not lower than a plate surface of the base plate or the projection section is not arranged lower than the plate surface of the base plate. [25] Battery pack according to claim 24, wherein the projecting section is higher or arranged higher than the plate surface of the base plate to support an electrical core. [26] Battery pack according to claim 9, wherein the curved connecting tube is provided as an integral part with the heat exchanger tube. [27] Battery pack according to claim 11, wherein the number of battery groups is at least two, wherein two adjacent battery groups are arranged consecutively along the width direction of the receiving groove. [28] Battery pack according to claim 9, wherein the base plate is further provided on the upper surface with a bending groove which is connected to the receiving groove, wherein the bent connecting tube is provided in the bending groove and the bending groove has the same depth as the receiving groove. [29] Battery pack according to claim 9, wherein the curved connecting tube has the same height as the heat exchange tube or wherein the height of the curved connecting tube corresponds to the height of the heat exchange tube.

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