CN118899592B

CN118899592B - Battery pack

Info

Publication number: CN118899592B
Application number: CN202411398937.9A
Authority: CN
Inventors: 孙庆; 凌俊华; 陈群泽; 王晓洋; 吴全升
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2024-10-09
Filing date: 2024-10-09
Publication date: 2025-02-14
Anticipated expiration: 2044-10-09
Also published as: CN118899592A; CN119481477A

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

Battery pack

Technical Field

The invention relates to the technical field of battery heat exchange, and particularly provides a battery pack.

Background

The battery heat exchange plate is also called a liquid cooling plate, is an important component in a new energy automobile heat management system, and is mainly used for cooling a power battery. Specifically, the design form and arrangement position of the battery heat exchange plate are diversified, and are mainly determined according to the type of the battery and the arrangement of the battery system as a whole.

In the related art, the heat exchange plate generally adopts the cross beam and the longitudinal beam to increase the strength, avoid deformation when being impacted by force, but additionally increase the cross beam and the longitudinal beam and weld the cross beam and the longitudinal beam on the heat exchange plate, thereby improving the occupied space of the integral structure, reducing the energy density and further aggravating the integral structure.

Disclosure of Invention

The invention aims to solve at least part of the technical problems mentioned in the above, and the aim is achieved by the following technical scheme:

The invention provides a battery pack, which comprises a battery pack, a battery box body and heat exchange plates arranged at the bottom of the battery box body, wherein the heat exchange plates are provided with a length direction and a width direction, the size of each heat exchange plate in the length direction is larger than that of each heat exchange plate in the width direction, the battery box body comprises a frame arranged around the periphery of each heat exchange plate, the frame and the heat exchange plates are enclosed to form an accommodating space, the battery pack is arranged in the accommodating space, a plurality of heat exchange channels which are arranged in parallel along the width direction are arranged in the heat exchange plates, partition walls are arranged between adjacent heat exchange channels, heat exchange media circulate in the heat exchange channels, each partition wall comprises a first partition wall and a second partition wall, the thickness of each first partition wall is larger than that of each second partition wall, each battery pack further comprises a fixing beam, the fixing beam is connected to the top surface of each heat exchange plate, and the extending direction of each fixing beam is intersected with the extending direction of each partition wall.

The technical scheme provided by the invention has at least the following technical effects:

In the invention, the heat exchange plate cancels the structure of the longitudinal beam, thickens at least part of the separation walls among the plurality of heat exchange channels, not only can ensure the structural strength and resist deformation caused by external force, but also has lighter weight and reduced space occupation compared with the additional welding of the longitudinal beam, thereby increasing the energy density in the battery pack.

Drawings

In order to better combine what is presented in the drawings of the specification with what is described in the detailed description, a brief description of the drawings of the specification is provided below. It is to be understood that the following description and drawings are only illustrative of some embodiments of the related art and of the present invention, and that other embodiments may be devised by those skilled in the art without the benefit of the present disclosure.

In particular, the notes of the drawings of the specification are as follows:

fig. 1 is a schematic view illustrating a structure of a battery pack according to some embodiments of the present invention;

fig. 2 is a schematic view of a battery according to some embodiments of the present invention;

FIG. 3 is a schematic view of the top surface of a heat exchanger plate according to some embodiments of the present invention;

FIG. 4 is a schematic view of a bottom surface of a heat exchange plate according to some embodiments of the present invention;

fig. 5 is a schematic view of the end face of a heat exchange plate according to some embodiments of the present invention.

In particular, the notations of the specification reference numerals are as follows:

100. The battery pack, 110, a battery box body, 120, a heat exchange plate, 121, a heat exchange channel, 1211, a liquid inlet, 122, a partition wall, 1221, a first partition wall, 1222, a second partition wall, 130, a fixed beam, 200, a battery, 300, an electric component, T1, a connection point, T2, a fastening point, X, a first direction, Y, a second direction, Z and a third direction.

Detailed Description

In order that the manner in which the above recited embodiments of the invention are attained and can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. Accordingly, other embodiments obtained based on the following examples fall within the scope of the present invention without inventive effort.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the technology set forth unless the context clearly dictates otherwise. For example, the use of "a," "an," and "the" herein to modify a feature does not preclude the feature from being plural in other embodiments.

It should be understood that the terms "comprising," "including," and "having" are intended to be open-ended, indicating the presence of the stated features, but not to preclude the presence of other features in the embodiment. Likewise, the use of the terms first, second, etc. herein to describe various features merely to distinguish one feature from another feature does not imply a sequence or order unless the context clearly indicates otherwise.

It should be understood that the terms "disposed," "coupled," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, or may be directly or indirectly connected via an intermediary, unless the context clearly dictates otherwise. The specific meaning of the terms herein above will be understood by those skilled in the art as the case may be.

In addition, for ease of description, terms of spatial relative relationship will be used herein to describe the position of one feature relative to another feature, e.g., "inner," "outer," "end," "side," "upper," "middle," "lower," "high," "low," "axial," "circumferential," "radial," "horizontal," "vertical," "first direction," "second direction," etc., and it is to be understood that the spatial relative relationship between the two features shall include other specifics than those shown in the drawings of the specification.

Embodiments of the invention are described below with reference to the accompanying drawings.

Referring to fig. 1, 3 and 5, the present invention provides a battery pack 100, which comprises a battery pack, a battery case 110, and a heat exchange plate 120 disposed at the bottom of the battery case 110, wherein the heat exchange plate 120 has a length direction and a width direction, the heat exchange plate 120 has a dimension in the length direction larger than that in the width direction, the battery case 110 comprises a frame disposed around the periphery of the heat exchange plate 120, the frame and the heat exchange plate 120 enclose a receiving space, the battery pack is disposed in the receiving space, the heat exchange plate 120 has a plurality of heat exchange channels 121 arranged in parallel in the width direction inside, partition walls 122 are disposed between adjacent heat exchange channels 121, a heat exchange medium flows through the heat exchange channels 121, the partition walls 122 comprise a first partition wall 1221 and a second partition wall 1222, the thickness of the first partition wall 1221 is larger than that of the second partition wall 1222, the battery pack 100 further comprises a fixing beam 130, the fixing beam 130 is connected to the top surface of the heat exchange plate 120, and the extending direction of the fixing beam 130 intersects the extending direction of the partition walls 122.

In the above embodiment, the heat exchange plate 120 eliminates the structure of the stringers, i.e., compared with the prior art, the stringers are not provided, and at least part of the partition walls 122 between the plurality of heat exchange channels 121 are thickened, so that the structural strength can be ensured, deformation caused by external force is resisted, and compared with the additional welding stringers, the weight is lighter, and meanwhile, the occupation of space is reduced, so that the energy density in the battery pack 100 can be increased.

It should be noted that, in some embodiments, the battery box 110 forms a space for accommodating the battery 200, and the heat exchange plate 120 may be directly used as a bottom wall of the battery box 110, which is used as a protection support member of the battery 200 and a heat exchange member of the battery 200, so as to increase space utilization.

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

It is understood that the battery pack may be a battery module, or may be a battery pack formed by connecting a plurality of batteries 200 in series and/or parallel through conductive bars.

In some embodiments, referring to fig. 3 and 4, the fixed beam 130 is fixedly coupled to the first partition wall 1221. Further, the fixing beam 130 is bolted to the heat exchange plate 120 and forms a connection point T1, and the connection point T1 is located on the first partition wall 1221.

In the above embodiment, the fixing beam 130 is connected with the heat exchange plate 120 through the thickened first partition wall 1221, which not only can achieve the purpose of connecting the fixing beam 130 with the heat exchange plate 120, but also can enable the connection position to meet the strength requirement, thereby improving the connection firmness.

Specifically, a plurality of screw holes are formed along the first direction X at intervals, a plurality of screw holes are formed along the third direction Z and are respectively located on a plurality of first partition walls 1221, the fixed beam 130 is connected with the screw holes through bolts, and compared with direct welding, the screw holes are easy to detach, so that the mounting flexibility is improved, and meanwhile, the requirements of the connection strength and the operation convenience can be met.

In some embodiments, a plurality of fixing beams 130 are arranged at intervals along the length direction of the heat exchange plate 120, 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, so that D1/D is more than or equal to 10% and less than or equal to 90%.

In the above embodiment, if the ratio of D1/D is too small, i.e., the distance between the connection points T1 is too short, the bolt fastening force carried by the first partition wall 1221 is relatively large and is easily deformed by force, so that the heat exchange channel 121 is damaged, whereas if the ratio of D1/D is too large, i.e., the distance between the fixing beams 130 is relatively long, the structural strength of the fixing beams 130 and the first partition wall 1221 is relatively weak, and the risk of structural failure of the battery pack 100 is relatively high. Thus, the D1/D ratio should be moderate, for example, 10%, 50%, 90%.

In some embodiments, the sum of the thicknesses of all the first partition walls 1221 is L1, and the dimension of the heat exchange plate 120 in the thickness direction of the partition plate is L, then 7% L1/L50%.

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 requirement, and if the ratio of L1/L is too small, the support strength of the heat exchange plate 120 is insufficient and is easily deformed by external force. Thus, the ratio L1/L should be moderate, for example, 7%, 25%, 50%.

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

In some embodiments, where the spacing between adjacent two of the dividing walls 122 is L2, then L3 is the sum of all L2, then 20% L3/L70%.

In the above embodiment, the distance between two adjacent partition walls 122 cannot be too large, otherwise the supporting strength cannot be ensured, and also should not be too small, otherwise the partition walls 122 are too dense, weight is increased for the case, and the heat exchange channels 121 are narrower, which affects the heat exchange efficiency. Thus, the ratio of L3/L should be moderate, for example, 20%, 50%, 70%.

It will be appreciated that L2 may also be the width of the heat exchanging channel 121 in the first direction X.

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

In the above-described embodiment, the plurality of first partition walls 1221 function to make the support of the heat exchange plate 120 more uniform, and to increase the support strength without increasing the volume occupied by the heat exchange plate 120.

In some embodiments, the heat exchange plate 120 is provided with one first partition wall 1221 at least at both sides in the thickness direction of the partition wall 122.

In the above embodiment, the heat exchange plate 120 is provided with the thickened first partition walls 1221 at least at both sides in the first direction X, so that the strength of the edge of the battery pack 100 can be ensured, and thus the strength of the whole battery pack 100 can be further ensured.

In addition, the two sidewalls of the battery case 110 in the first direction X may be connected to the first partition walls 1221 of the heat exchange plate 120 at both sides in the first direction X by bolts, and form fastening points T2, thereby increasing the connection strength and the strength of the overall structure.

In some embodiments, the thickness d1 of the first divider wall 1221 and the thickness d2 of the second divider wall 1222 are 3% d2/d 1% 20%.

In the above embodiment, if the ratio of d2/d1 is too large, the second partition wall 1222 is also thicker, and in the case of ensuring that the external dimension of the battery pack 100 is not changed, that is, the width of the heat exchange plate 120 in the first direction X is not changed, the width of the heat exchange passage 121 tends to be reduced, so that the heat exchange effect cannot be ensured, whereas if the ratio of d2/d1 is too small, the second partition wall 1222 is thinner, the strength of the second partition wall 1222 cannot be ensured, and thus the supporting strength of the heat exchange plate 120 is reduced. Thus, the ratio d2/d1 should be moderate, for example, 3%, 12%, 20%.

In some embodiments, the height of the first partition wall 1221 is h1, 30% d1/h1 is 70%.

In the above embodiment, if the ratio of d1/h1 is too large, the height of the first partition wall 1221 is too small, i.e., the heat exchange plate 120 is too thin and the strength is insufficient, and conversely, if the ratio of d1/h1 is too small, it is indicated that the heat exchange plate 120 is too thick, the inner space of the battery pack 100 in the third direction Z is compressed, so that the space utilization is too low. Thus, the ratio d1/h1 should be moderate, for example 30%, 50%, 70%.

In some embodiments, referring to fig. 2, a liquid inlet 1211 is provided at one end of the heat exchanging channel 121, and the battery pack 100 is provided with an electrical component 300 at one end along the extending direction of the heat exchanging channel 121, and the electrical component 300 is located at the same side as the liquid inlet 1211.

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 at the same side in the second direction Y, which is helpful for optimizing the internal space layout of the battery 200 pack, making the design of the battery 200 pack more compact, improving the space utilization, simplifying the maintenance and overhaul process, because the related components are concentrated in one area, facilitating the operation and inspection of the technician, and the arrangement of the electrical component 300 and the liquid inlet 1211 of the heat exchange plate 120 on the same side is helpful for improving the heat exchange efficiency, because the cooling liquid can more directly contact the key components of the battery 200 pack, realizing more effective heat management, and secondly, the arrangement is also capable of reducing the length of the cooling liquid pipe, reducing the pipe resistance, improving the cooling liquid flow efficiency, reducing the use of pipe materials, and helping to reduce the weight of the whole battery pack 100, and reducing the cost.

In some embodiments, referring to fig. 2, a plurality of cells 200 are disposed on the top surface of the heat exchange plate 120, the plurality of cells 200 are aligned in the same direction as the extending direction of the heat exchange channels 121, and the projections of the cells 200 and the first partition walls 1221 on the top surface of the heat exchange plate 120 are at least partially coincident.

In the above embodiment, the thickened first partition wall 1221 may function to support the battery 200 group, improving the overall structural strength.

In some embodiments, the projected area of the cell 200 on the top surface of the heat exchange plate 120 is S, and the projected overlapping area of the cell 200 and the first partition wall 1221 on the top surface of the heat exchange plate 120 is S1, then 3% S1/S10%.

In the above embodiment, if the ratio of S1/S is too small, the supporting effect on the battery 200 set is insufficient, and conversely, if the ratio of S1/S is too large, it is indicated that the projection of the battery 200 and the first partition wall 1221 overlap too much, and the projection of the battery 200 and the heat exchanging channel 121 overlap less, so that the heat exchanging effect cannot be ensured.

It should be noted that the embodiments of the present application only illustrate the structure of the battery pack 100 related to the improvement point of the present application, but do not represent that the battery pack 100 does not have other structures, for example, the battery pack 100 further includes a copper bar sheet connected thereto, and/or a high voltage wire harness, a low voltage wire harness, etc., and other structures are not illustrated herein.

In particular, the term "and/or" in the present invention shall be understood as follows:

In the first case, the term "and/or" located between the first body and the second body includes any one of (1) only the first body, (2) only the second body, and (3) the first body and the second body.

In the second case, the term "and/or" located between the last two of three or more bodies is meant to include at least any one of the bodies. For example, "first body, second body, and/or third body" has the same meaning as "first body and/or second body and/or third body," and specifically includes combinations of (1) only first body, (2) only second body, (3) only third body, (4) first body and second body and no third body, (5) first body and third body and no second body, (6) second body and third body and no first body, and (7) first body and second body and third body.

Further, while the foregoing describes embodiments of the present invention with reference to the accompanying drawings, those skilled in the art may make various modifications and alterations without departing from the spirit of the invention, and such modifications and alterations fall within the scope of the invention.

Claims

1. The battery pack is characterized by comprising a battery pack, a battery box body (110) and a heat exchange plate (120) arranged at the bottom of the battery box body (110), wherein the heat exchange plate (120) has a length direction and a width direction, and the dimension of the heat exchange plate (120) in the length direction is larger than that of the heat exchange plate in the width direction;

The battery box body (110) comprises a frame arranged around the periphery of the heat exchange plate (120), the frame and the heat exchange plate (120) enclose an accommodating space, and the battery pack is arranged in the accommodating space;

the inside of the heat exchange plate (120) is provided with a plurality of heat exchange channels (121) which are arranged in parallel along the width direction, a partition wall (122) is arranged between the adjacent heat exchange channels (121), and a heat exchange medium is suitable for being placed in the heat exchange channels (121);

The partition wall (122) includes a first partition wall (1221) and a second partition wall (1222), a size of the first partition wall (1221) being larger than a size of the second partition wall (1222) in a width direction of the heat exchange plate (120);

The top surface of the heat exchange plate (120) is fixedly connected with a fixed beam (130), and the extending direction of the fixed beam (130) is intersected with the extending direction of the separation wall (122);

The fixed beam (130) is fixedly connected to the first partition wall (1221).

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

3. The battery pack according to claim 2, wherein a plurality of the fixing beams (130) are provided at intervals along the length direction of the heat exchange plate (120), 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, 10% to 90% D1/D.

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

5. The battery pack according to claim 4, wherein the spacing between adjacent two partition walls (122) is L2, L3 is the sum of all L2, and 20% or less L3/L or less than 70%.

6. The battery pack according to claim 1, wherein the heat exchange plate (120) is provided with at least two of the first partition walls (1221).

7. The battery pack according to claim 6, wherein the heat exchange plate (120) is provided with one of the first partition walls (1221) at least at both ends in the width direction thereof.

8. The battery pack according to claim 1, wherein the first partition wall (1221) has a dimension d1 in the width direction of the heat exchange plate (120), and the second partition wall (1222) has a dimension d2 in the width direction of the heat exchange plate (120), 3% or more d2/d1 or less than 20%.

9. The battery pack according to claim 8, wherein the heat exchange plate (120) further has a thickness direction, and the first partition wall (1221) has a dimension h1 in the thickness direction of the heat exchange plate (120) of 30% or more d1/h1 or less 70%.

10. The battery pack according to claim 1, wherein one end of the heat exchanging channel (121) is provided with a liquid inlet (1211), and the battery pack (100) is provided with an electric component (300) at one end along the extending direction of the heat exchanging channel (121), and the electric component (300) and the liquid inlet (1211) are positioned at the same side.

11. The battery pack according to claim 1, wherein the battery pack includes a plurality of cells (200) placed on the top surface of the heat exchange plate (120), the plurality of cells (200) are arranged in the same direction as the extending direction of the heat exchange passage (121), and projections of the cells (200) and the first partition wall (1221) on the top surface of the heat exchange plate (120) are at least partially overlapped.

12. The battery pack according to claim 11, wherein the projected area of the battery (200) on the top surface of the heat exchange plate (120) is S, and the projected overlapping area 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/S10% or less.