Battery Pack

Abstract

The present invention relates to the technical field of battery heat exchange, and specifically proposes a battery pack, which includes a battery group, a battery box, and a heat exchange plate arranged at the bottom of the battery box. The heat exchange plate has a plurality of heat exchange channels inside, and partition walls are arranged between adjacent heat exchange channels, and the partition walls include a first partition wall with a larger thickness and a second partition wall with a smaller thickness; a fixed beam is connected to the top surface of the heat exchange plate, and the extension direction of the fixed beam intersects with the extension direction of the partition wall. In the present invention, the heat exchange plate eliminates the structure of the longitudinal beam, and thickens at least part of the partition walls between the plurality of heat exchange channels, which can ensure the structural strength and resist external forces, and compared with the additional welded longitudinal beams, reduces the space occupied, thereby increasing the energy density in the battery box; in addition, the heat exchange plate in the present invention can be formed by extrusion, which is easier to manufacture and improves production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of battery heat exchange, and specifically proposes a battery pack. Background Art

[0002] Battery heat exchanger plates, also known as liquid cooling plates, are an important part of the thermal management system of new energy vehicles and are mainly used to cool power batteries. Specifically, the design form and layout of battery heat exchanger plates are diverse, mainly determined by the type of battery and the overall layout of the battery system.

[0003] In the related art, heat exchange plates generally use cross beams and longitudinal beams to increase strength and avoid deformation when subjected to force impact. However, adding additional cross beams and longitudinal beams and welding them to the heat exchange plate will increase the space occupied by the overall structure, reduce energy density, and also make the overall structure heavier. Summary of the invention

[0004] The purpose of the present invention is to solve at least part of the technical problems mentioned above, and this purpose is achieved through the following technical solutions:

[0005] The present invention proposes a battery pack, which includes a battery group, a battery case and a heat exchange plate arranged at the bottom of the battery case, the heat exchange plate has a length direction and a width direction, and the size of the heat exchange plate in the length direction is greater than its size in the width direction; the battery case includes a frame arranged around the outer periphery of the heat exchange plate, the frame and the heat exchange plate enclose a receiving space, and the battery group is placed in the receiving space; the interior of the heat exchange plate has a plurality of heat exchange channels arranged in parallel along the width direction, partition walls are provided between adjacent heat exchange channels, and heat exchange medium flows in the heat exchange channels; the partition walls include a first partition wall and a second partition wall, the thickness of the first partition wall is greater than the thickness of the second partition wall; the battery pack also includes a fixed beam, the fixed beam is connected to the top surface of the heat exchange plate, and the extension direction of the fixed beam intersects with the extension direction of the partition wall.

[0006] The technical solution proposed by the present invention has at least the following technical effects:

[0007] In the present invention, the heat exchange plate eliminates the longitudinal beam structure and thickens at least part of the partition walls between the multiple heat exchange channels, which can not only ensure the structural strength and resist deformation caused by external forces, but also is lighter in weight compared with additional welded longitudinal beams, while reducing the space occupied, thereby increasing the energy density in the battery pack; in addition, the heat exchange plate in the present invention can be formed by extrusion, which is easier to manufacture and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to better combine the contents shown in the drawings of the specification with the contents described in the specific implementation methods, the drawings of the specification are briefly introduced below. It can be understood that the drawings of the specification mentioned below only schematically show some embodiments of the relevant technical solutions and the technical solutions of the present invention. Without paying creative labor, those skilled in the art can also make drawings showing other embodiments.

[0009] Specifically, the annotations of the drawings in the specification are as follows:

[0010] Figure 1 It is a schematic diagram of the structure of the battery pack according to some embodiments of the present invention;

[0011] Figure 2 It is a schematic diagram of the structure of the battery described in some embodiments of the present invention;

[0012] Figure 3 It is a schematic structural diagram of the top surface of the heat exchange plate according to some embodiments of the present invention;

[0013] Figure 4 It is a structural schematic diagram of the bottom surface of the heat exchange plate according to some embodiments of the present invention;

[0014] Figure 5 It is a schematic structural diagram of the end surface of the heat exchange plate described in some embodiments of the present invention.

[0015] Specifically, the annotations of the accompanying drawings in the specification are as follows:

[0016] 100, battery pack; 110, battery case; 120, heat exchange plate; 121, heat exchange channel; 1211, liquid inlet; 122, partition wall; 1221, first partition wall; 1222, second partition wall; 130, fixing beam; 200, battery; 300, electrical parts; T1, connection point; T2, fastening point; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0017] In order to make the contents of the embodiments of the present invention clearer, the following description will be made in conjunction with the accompanying drawings. It can be understood that the contents mentioned below are only some embodiments of the present invention, and all embodiments are listed in detail. Therefore, without paying creative work, other embodiments obtained based on the following embodiments fall within the protection scope of the present invention.

[0018] It should be understood that the terms used herein are only for the purpose of describing specific embodiments and are not intended to strictly limit the technical solutions unless the context clearly indicates otherwise. For example, the use of "a", "an" and "the" to modify a feature does not exclude that the feature may also be plural in other embodiments.

[0019] It should be understood that the terms "include", "comprises", and "have" are open ended, indicating the presence of the stated features, but not excluding the possibility that the embodiment may have other features. Similarly, the use of the terms first, second, etc. in the text to describe multiple features only means to distinguish one feature from another, and unless the context clearly indicates otherwise, such terms do not imply an order or sequence.

[0020] It should be understood that, unless the context clearly indicates otherwise, the terms "dispose", "connect", and "install" should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrally connected; they can be directly connected or indirectly connected through a medium. For those skilled in the art, the specific meanings of the above terms in the text can be understood according to the specific circumstances.

[0021] In addition, for the convenience of description, the text will use terms of spatial relative relationships to illustrate the position of one feature relative to another feature, for example, "inside", "outside", "end", "side", "top", "middle", "bottom", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations in addition to those shown in the drawings of the specification.

[0022] The embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0023] Reference Figure 1 , Figure 3 and Figure 5 The present invention proposes a battery pack 100, which includes a battery pack, a battery box 110, and a heat exchange plate 120 arranged at the bottom of the battery box 110. The heat exchange plate 120 has a length direction and a width direction. The length of the heat exchange plate 120 is greater than its width. The battery box 110 includes a frame arranged around the outer periphery of the heat exchange plate 120. The frame and the heat exchange plate 120 are surrounded by a receiving space, and the battery pack is placed in the receiving space. The interior of the heat exchange plate 120 has a plurality of widths. The heat exchange channels 121 are arranged in parallel in a direction, and partition walls 122 are provided between adjacent heat exchange channels 121; a heat exchange medium flows in the heat exchange channels 121; the partition walls 122 include a first partition wall 1221 and a second partition wall 1222, and the thickness of the first partition wall 1221 is greater than the thickness of the second partition wall 1222; the battery pack 100 also includes a fixed beam 130, the fixed beam 130 is connected to the top surface of the heat exchange plate 120, and the extension direction of the fixed beam 130 intersects with the extension direction of the partition wall 122.

[0024] In the above embodiment, the heat exchange plate 120 eliminates the longitudinal beam structure, that is, compared with the prior art, no longitudinal beam is provided, and at least part of the partition wall 122 between the plurality of heat exchange channels 121 is thickened, which can ensure the structural strength and resist deformation caused by external forces, and compared with the additional welded longitudinal beam, it is lighter and reduces the space occupied, thereby increasing the energy density in the battery pack 100; in addition, the heat exchange plate 120 in the present invention can be formed by extrusion, which is easier to manufacture and improves production efficiency.

[0025] It should be noted that, in some embodiments, the interior of the battery box 110 constitutes a space for accommodating the battery 200, and the heat exchange plate 120 can directly serve as the bottom wall of the battery box 110, serving as both a protective support for the battery 200 and a heat exchange component for the battery 200, thereby increasing space utilization.

[0026] In particular, the width direction of the heat exchange plate 120 is the first direction X, the length direction of the heat exchange plate 120 is the second direction Y, and the thickness direction of the heat exchange plate 120 is the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The fixing beam 130 preferably extends along the first direction X, that is, the extension direction of the fixing beam 130 is perpendicular to the extension direction of the partition wall 122.

[0027] It can be understood that the battery pack can be a battery module, or a battery combination formed by connecting a plurality of batteries 200 in series and / or in parallel via conductive bars.

[0028] In some embodiments, reference Figure 3 and Figure 4 The fixing beam 130 is fixedly connected to the first partition wall 1221. Further, the fixing beam 130 is bolted to the heat exchange plate 120 to form a connection point T1, and the connection point T1 is located on the first partition wall 1221.

[0029] In the above embodiment, the fixed beam 130 is connected to the heat exchange plate 120 through the thickened first partition wall 1221, which can not only connect the fixed beam 130 and the heat exchange plate 120, but also make the connection meet the strength requirements and improve the firmness of the connection.

[0030] Specifically, multiple screw holes are opened at intervals along the first direction X, and multiple screw holes are opened along the third direction Z and are respectively located on multiple first partition walls 1221. The fixed beam 130 is connected to the screw holes by bolts. Compared with direct welding, it is easy to disassemble and increases installation flexibility, and at the same time can meet the requirements of connection strength and operational convenience.

[0031] In some embodiments, a plurality of fixed beams 130 are spaced apart along the length direction of the heat exchange plate 120, and a plurality of spaced connection points T1 are formed on the same first partition wall 1221, the distance between two adjacent connection points T1 is D1, and the dimension of the first partition wall 1221 along the length direction of the heat exchange plate 120 is D, then 10%≤D1 / D≤90%.

[0032] In the above embodiment, if the ratio of D1 / D is too small, that is, the distance between the connection point T1 is too close, the bolt tightening force borne by the first partition wall 1221 is relatively large, and it is easy to deform due to force, causing damage to the heat exchange channel 121; on the contrary, if the ratio of D1 / D is too large, that is, the distance between the fixed beams 130 is far, the structural strength of the fixed beams 130 and the first partition wall 1221 is weak, and the risk of structural failure of the battery pack 100 is greater. Therefore, the ratio of D1 / D should be moderate, for example, it can be 10%, 50%, or 90%.

[0033] In some embodiments, the sum of the thicknesses of all first partition walls 1221 is L1, and the dimension of the heat exchange plate 120 along the thickness direction of the partition plate is L, then 7%≤L1 / L≤50%.

[0034] In the above embodiment, if the ratio of L1 / L is too large, the heat exchange area is insufficient and the heat exchange efficiency does not meet the requirements; if the ratio of L1 / L is too small, the support strength of the heat exchange plate 120 is insufficient and it is easy to deform when encountering external force. Therefore, the ratio of L1 / L should be moderate, for example, 7%, 25%, or 50%.

[0035] It should be noted that L is the dimension of the heat exchange plate 120 along the first direction X, and can also be understood as the width of the heat exchange plate 120 .

[0036] In some embodiments, the distance between two adjacent partition walls 122 is L2, and L3 is the sum of all L2, and 20%≤L3 / L≤70%.

[0037] In the above embodiment, the distance between two adjacent partition walls 122 cannot be too large, otherwise the support strength cannot be guaranteed, and it should not be too small, otherwise the partition walls 122 are too dense, which increases the weight of the box body and makes the heat exchange channel 121 narrower, affecting the heat exchange efficiency. Therefore, the ratio of L3 / L should be moderate, for example, it can be 20%, 50%, or 70%.

[0038] It can be understood that L2 can also be the width of the heat exchange channel 121 in the first direction X.

[0039] In some embodiments, the heat exchange plate 120 is provided with at least two first partition walls 1221 .

[0040] In the above embodiment, the function of the plurality of first partition walls 1221 is to make the support of the heat exchange plate 120 more uniform and to increase the support strength, while not increasing the volume occupied by the heat exchange plate 120 .

[0041] In some embodiments, the heat exchange plate 120 is provided with at least one first partition wall 1221 on each of two sides along the thickness direction of the partition wall 122 .

[0042] In the above embodiment, the heat exchange plate 120 is provided with thickened first partition walls 1221 at least on both sides of the first direction X, which can ensure the strength of the edge of the battery pack 100 , thereby further ensuring the overall strength of the battery pack 100 .

[0043] In addition, the two side walls of the battery box 110 in the first direction X can also be connected to the first partition walls 1221 on both sides of the heat exchange plate 120 in the first direction X by bolts to form a fastening point T2 to increase the connection strength and the strength of the overall structure.

[0044] In some embodiments, the thickness of the first partition wall 1221 is d1, and the thickness of the second partition wall 1222 is d2, then 3%≤d2 / d1≤20%.

[0045] In the above embodiment, if the ratio of d2 / d1 is too large, the second partition wall 1222 is also thicker. Under the condition that the outer dimensions of the battery pack 100 remain unchanged, that is, the width of the heat exchange plate 120 in the first direction X remains unchanged, the width of the heat exchange channel 121 will inevitably be reduced, so the heat exchange effect cannot be guaranteed; on the contrary, if the ratio of d2 / d1 is too small, the second partition wall 1222 is thinner, and the strength of the second partition wall 1222 cannot be guaranteed, thereby reducing the supporting strength of the heat exchange plate 120. Therefore, the ratio of d2 / d1 should be moderate, for example, 3%, 12%, or 20%.

[0046] In some embodiments, the height of the first partition wall 1221 is h1, then 30%≤d1 / h1≤70%.

[0047] In the above embodiment, if the ratio of d1 / h1 is too large, the height of the first partition wall 1221 is too small, that is, the heat exchange plate 120 is too thin and the strength is insufficient; on the contrary, if the ratio of d1 / h1 is too small, it means that the heat exchange plate 120 is too thick, which will squeeze the internal space of the battery pack 100 in the third direction Z, making the space utilization rate too low. Therefore, the ratio of d1 / h1 should be moderate, for example, 30%, 50%, or 70%.

[0048] In some embodiments, reference Figure 2A liquid inlet 1211 is provided at one end of the heat exchange channel 121 , and an electrical component 300 is provided at one end of the battery pack 100 along the extending direction of the heat exchange channel 121 , and the electrical component 300 and the liquid inlet 1211 are located on the same side.

[0049] In the above embodiment, the liquid inlet 1211 of the heat exchange channel 121 and the electrical component 300 on the battery pack 100 are located on the same side of the second direction Y, which helps to optimize the internal space layout of the battery 200 package, making the battery 200 package design more compact and improving space utilization; it can also simplify the maintenance and repair process, because the relevant components are concentrated in one area, which is convenient for technicians to operate and inspect; in addition, the electrical component 300 and the liquid inlet 1211 of the heat exchange plate 120 are arranged on the same side to improve the heat exchange efficiency, because the coolant can more directly contact the key components of the battery 200 package, thereby achieving more effective thermal management; secondly, this arrangement can also reduce the length of the coolant pipeline, reduce pipeline resistance, and improve the coolant flow efficiency, while also reducing the use of pipeline materials, which helps to reduce the weight of the entire battery pack 100 while reducing costs.

[0050] In some embodiments, reference Figure 2 A plurality of batteries 200 are placed on the top surface of the heat exchange plate 120 , and the arrangement direction of the plurality of batteries 200 is the same as the extension direction of the heat exchange channel 121 , and the projections of the batteries 200 and the first partition wall 1221 on the top surface of the heat exchange plate 120 at least partially overlap.

[0051] In the above embodiment, thickening the first partition wall 1221 can support the battery group 200 and improve the overall structural strength.

[0052] In some embodiments, the projection area of ​​the battery 200 on the top surface of the heat exchange plate 120 is S, and the overlapping area of ​​the projections of the battery 200 and the first partition wall 1221 on the top surface of the heat exchange plate 120 is S1, then 3%≤S1 / S≤10%.

[0053] In the above embodiment, if the ratio of S1 / S is too small, the supporting effect on the battery 200 group is insufficient; on the contrary, if the ratio of S1 / S is too large, it means that the projection of the battery 200 overlaps too much with the first partition wall 1221, and the projection of the battery 200 overlaps less with the heat exchange channel 121, so that the heat exchange effect cannot be guaranteed.

[0054] It should be noted that the embodiments of the present invention only illustrate the structure of the battery pack 100 related to the improvement points of the present application, but it does not mean that it does not have other structures. For example, the battery pack 100 also includes connecting copper bars, and / or high-voltage wiring harnesses, low-voltage wiring harnesses, etc. Other structures will not be described one by one here.

[0055] In particular, the term "and / or" in the present invention should be understood as follows:

[0056] In the first case, the term "and / or" located between a first subject and a second subject includes any one of the following meanings: (1) only the first subject; (2) only the second subject; and (3) the first subject and the second subject.

[0057] In the second case, the term "and / or" between the last two entities among three or more entities refers to at least any one of the entities. For example, "the first entity, the second entity and / or the third entity" has the same meaning as "the first entity and / or the second entity and / or the third entity", specifically including the following combinations: (1) only the first entity; (2) only the second entity; (3) only the third entity; (4) the first entity and the second entity without the third entity; (5) the first entity and the third entity without the second entity; (6) the second entity and the third entity without the first entity; and (7) the first entity, the second entity, and the third entity.

[0058] In addition, although the above content describes the embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art can also make various modifications and variations without departing from the concept of the present invention, and such modifications and variations all fall within the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: Comprising a battery pack, a battery box (110), and a heat exchange plate (120) arranged at the bottom of the battery box (110), the heat exchange plate (120) having a length direction and a width direction, and the size of the heat exchange plate (120) in the length direction is greater than its size in the width direction; The battery box (110) comprises a frame arranged around the outer periphery of the heat exchange plate (120), the frame and the heat exchange plate (120) enclose a receiving space, and the battery pack is placed in the receiving space; The heat exchange plate (120) has a plurality of heat exchange channels (121) arranged in parallel along the width direction, and a partition wall (122) is provided between adjacent heat exchange channels (121). The heat exchange channels (121) are suitable for placing a heat exchange medium. The partition wall (122) comprises a first partition wall (1221) and a second partition wall (1222); in the width direction of the heat exchange plate (120), the size of the first partition wall (1221) is larger than the size of the second partition wall (1222); A fixing beam (130) is fixedly connected to the top surface of the heat exchange plate (120), and an extension direction of the fixing beam (130) intersects with an extension direction of the partition wall (122); The fixed beam (130) is fixedly connected to the first partition wall (1221).

2. The battery pack according to claim 1, characterized in that: The fixing beam (130) is bolted to the heat exchange plate (120) to form a connection point (T1), and the connection point (T1) is located on the first partition wall (1221).

3. The battery pack according to claim 2, characterized in that: A plurality of the fixing beams (130) are arranged at intervals along the length direction of the heat exchange plate (120), and a plurality of the connection points (T1) are formed at intervals on the same first partition wall (1221), the distance between two adjacent connection points (T1) is D1, and the dimension of the first partition wall (1221) along the length direction of the heat exchange plate (120) is D, then 10%≤D1 / D≤90%.

4. The battery pack according to claim 1, characterized in that: The sum of the dimensions of all the first partition walls (1221) along the width direction of the heat exchange plate (120) is L1, and the dimension of the heat exchange plate (120) in its width direction is L, then 7%≤L1 / L≤50%.

5. The battery pack according to claim 4, characterized in that: The distance between two adjacent partition walls (122) is L2, L3 is the sum of all L2s, and 20%≤L3 / L≤70%.

6. The battery pack according to claim 1, characterized in that: The heat exchange plate (120) is provided with at least two first partition walls (1221).

7. The battery pack according to claim 6, characterized in that: The heat exchange plate (120) is provided with a first partition wall (1221) at each of at least two ends in the width direction thereof.

8. The battery pack according to claim 1, characterized in that: The dimension of the first partition wall (1221) along the width direction of the heat exchange plate (120) is d1, and the dimension of the second partition wall (1222) along the width direction of the heat exchange plate (120) is d2, then 3%≤d2 / d1≤20%.

9. The battery pack according to claim 8, characterized in that: The heat exchange plate (120) also has a thickness direction, and the dimension of the first partition wall (1221) along the thickness direction of the heat exchange plate (120) is h1, and 30%≤d1 / h1≤70%.

10. The battery pack according to claim 1, characterized in that: A liquid inlet (1211) is provided at one end of the heat exchange channel (121), and an electrical component (300) is provided at one end of the battery pack (100) along the extension direction of the heat exchange channel (121), and the electrical component (300) and the liquid inlet (1211) are located on the same side.

11. The battery pack according to claim 1, characterized in that: The battery pack comprises a plurality of batteries (200) placed on the top surface of the heat exchange plate (120), the arrangement direction of the plurality of batteries (200) being the same as the extension direction of the heat exchange channel (121), and the projections of the batteries (200) and the first partition wall (1221) on the top surface of the heat exchange plate (120) at least partially overlapping.

12. The battery pack according to claim 11, characterized in that: The projection area of ​​the battery (200) on the top surface of the heat exchange plate (120) is S, and the overlapping area of ​​the projections of the battery (200) and the first partition wall (1221) on the top surface of the heat exchange plate (120) is S1, then 3%≤S1 / S≤10%.

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