Battery pack

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery pack. Comprising a plurality of battery cell groups, a first liquid cooling plate and a second liquid cooling plate, and the plurality of battery cell groups are arranged side by side; the first liquid cooling plate is clamped between two adjacent battery cell groups; the second liquid cooling plate is located on the bottom side of the battery cell group, and the second liquid cooling plate and the first liquid cooling plate form an integrated extrusion molding structural part. The battery pack disclosed by the utility model at least has the following beneficial effects that the first liquid cooling plate and the second liquid cooling plate are matched to cool the battery cell group, and the battery cell group is cooled on at least three surfaces, so that the cooling effect is good; on the basis, the first liquid cooling plate and the second liquid cooling plate are integrally extruded and molded, the structure is simple, the layout is compact, the space utilization rate is favorably improved, and the energy density and the heat dissipation performance of the battery pack are favorably improved.

Description

Technical Field

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

[0002] As one of the core components of the power system of new energy vehicles, the performance of the battery pack is crucial, especially since the battery pack will emit heat during use, and the temperature of the battery pack needs to be regulated. At present, the heat dissipation performance of the battery pack is generally improved by configuring a cooling system inside the battery pack, but the traditional cooling system is not only complex in structure and occupies a large space, but also has poor cooling effect, which is not conducive to improving the energy density and heat dissipation performance of the battery pack. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a battery pack for solving the problems of the cooling system of the battery pack in the prior art, such as complex structure, large occupied space and poor cooling effect, so as to improve the energy density and heat dissipation performance of the battery pack.

[0004] In order to achieve the above-mentioned object and other related objects, the utility model provides a battery pack, comprising:

[0005] A plurality of battery cell groups, wherein the plurality of battery cell groups are arranged side by side;

[0006] A first liquid cooling plate, wherein the first liquid cooling plate is sandwiched between two adjacent battery cell groups; and

[0007] The second liquid cooling plate is located at the bottom side of the battery cell group and is formed as an integrally extruded structural component with the first liquid cooling plate.

[0008] Optionally, an explosion-proof valve is provided on the bottom side of the battery cell group, and an exhaust structure corresponding to the explosion-proof valve is provided on the side of the second liquid cooling plate facing the explosion-proof valve.

[0009] Optionally, the wall surface of the second liquid cooling plate facing the explosion-proof valve is partially concave to form the exhaust structure, and the exhaust structure cooperates with a portion of the wall surface on the bottom side of the battery cell group to define an exhaust channel suitable for exhausting the gas exhausted by the explosion-proof valve.

[0010] Optionally, each of the battery cell groups includes a plurality of stacked battery cells, and the exhaust structure extends along a stacking direction of the plurality of battery cells in the same battery cell group.

[0011] Optionally, the second liquid cooling plate includes a plurality of main board bodies distributed along the side-by-side direction of the plurality of battery cell groups, and two adjacent main board bodies are spliced ​​and fixed, and the exhaust structure is formed at the splicing position.

[0012] Optionally, each main board body has a splicing end spliced ​​with an adjacent main board body, the splicing end is provided with a notch facing the explosion-proof valve, and the notch of the main board body and the notch of the main board body adjacent thereto are sealed and spliced ​​to construct the exhaust structure.

[0013] Optionally, the first liquid cooling plate is connected to the main board body in an inverted T shape.

[0014] Optionally, the battery pack further includes a rear end beam, on which is provided an exhaust portion suitable for exhausting smoke in the exhaust channel.

[0015] Optionally, a first cooling channel staggered with the exhaust structure is provided in the second liquid cooling plate.

[0016] Optionally, the battery pack also includes a front end beam having a second cooling channel, the front end beam connecting multiple first liquid cooling plates and the second liquid cooling plates, and the third cooling channels in the multiple first liquid cooling plates and the first cooling channels in the second liquid cooling plates are connected through the second cooling channels in the front end beam to form a circulating cooling channel.

[0017] Optionally, the first liquid cooling plates are arranged on both sides of the battery cell group.

[0018] As described above, the battery pack of the utility model has at least the following beneficial effects: the first liquid cooling plate and the second liquid cooling plate cooperate to cool the battery cell group, and the battery cell group is cooled on at least three sides, and the cooling effect is good; based on this, the first liquid cooling plate and the second liquid cooling plate are extruded as one piece, with a simple structure and a compact layout, which is conducive to improving space utilization, thereby helping to improve the energy density and heat dissipation performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a partial structural schematic diagram of a battery pack of the utility model;

[0020] Figure 2 for Figure 1 A schematic diagram of the structure of the third liquid cooling plate and the second liquid cooling plate;

[0021] Figure 3 for Figure 1 A top view of the third liquid cooling plate and the second liquid cooling plate;

[0022] Figure 4 for Figure 3 Sectional view at AA in the middle;

[0023] Figure 5 for Figure 4 Enlarged schematic diagram of part B in the middle.

[0024] Part Number Description

[0025] Battery cell group 1, battery cell 11, pole 12, second liquid cooling plate 2, exhaust structure 21, main board body 22, recess 221, first cooling channel 23, first liquid cooling plate 3, third cooling channel 31, front end beam 4, rear end beam 5. DETAILED DESCRIPTION

[0026] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0027] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0028] See also Figures 1 to 5 In some optional embodiments, the present application provides a battery pack, which includes a plurality of battery cell groups 1, a first liquid cooling plate 3 and a second liquid cooling plate 2; in addition to the above-mentioned components, the battery pack may also include a third liquid cooling plate (not shown) and / or a front end beam 4 and / or a rear end beam 5. The plurality of battery cell groups 1 are arranged side by side, and the first liquid cooling plate 3 is sandwiched between two adjacent battery cell groups 1, or in other words, the two adjacent battery cell groups 1 are separated by the first liquid cooling plate 3, so that the two adjacent battery cell groups 1 can share a first liquid cooling plate 3, and the layout is compact, which is conducive to simplifying the structure, improving the energy density and reducing the cost. The second liquid cooling plate 2 is located on the bottom side of the battery cell group 1, and is constructed as an integral extruded structure with the first liquid cooling plate 3; in other words, the first liquid cooling plate 3 and the second liquid cooling plate 2 include extruded profiles and can be connected as an integral structure, and the molding and manufacturing are simple.

[0029] Optionally, the cell group 1 has a top side opposite to the bottom side of the cell group 1, and the third liquid cooling plate is located on the top side of the cell group. The first liquid cooling plate, the second liquid cooling plate and the third liquid cooling plate cooperate so that the cell group 1 can be cooled on at least four sides, and the cooling effect is good. Furthermore, the cell group 1 is provided with a pole 12 and an explosion-proof valve (not shown), and the pole 12 and the explosion-proof valve can be located on the same side or different sides of the cell group 1. Specifically, the top side of the cell group 1 is provided with a pole 12, and the bottom side of the cell group 1 is provided with an explosion-proof valve; or, the top side of the cell group 1 is provided with a pole 12 and an explosion-proof valve; or, the top side of the cell group 1 is provided with an explosion-proof valve, and the bottom side of the cell group 1 is provided with a pole 12. It can be understood that the top side and the bottom side of the battery cell group 1 can be two sides distributed along the height direction of the battery cell group 1. The top side and the bottom side of the battery cell group 1 are a description of a relative position, that is, the bottom side of the battery cell group 1 is not only vertically downward, but can also be vertically upward; for example, when the battery cell group 1 is upright, the bottom side of the battery cell group 1 is downward, and the top side of the battery cell group 1 is upward. When the battery cell group 1 is inverted, the bottom side of the battery cell group 1 is upward, and the top side of the battery cell group 1 is downward. When the pole 12 and the explosion-proof valve of the battery cell group 1 are on different sides, the second liquid cooling plate 2 and the third liquid cooling plate can act on the side of the battery cell group 1 with the explosion-proof valve and the side with the pole 12, respectively, so that the cooling effect is better, which is conducive to improving the heat dissipation performance of the battery pack.

[0030] Optionally, each battery cell group 1 includes multiple battery cells 11, and the multiple battery cells 11 in the same battery cell group 1 are stacked, each battery cell 11 has a pole 12 and an explosion-proof valve, and the pole 12 and the explosion-proof valve of the battery cell 11 are located on the same side or different sides of the battery cell 11.

[0031] In the battery pack of the above embodiment, the first liquid cooling plate 3 and the second liquid cooling plate 2 can cooperate to cool at least three sides of the battery cell group 1, and the cooling effect is good; in addition, the first liquid cooling plate 3 and the second liquid cooling plate 2 are extruded as a whole, with a simple structure and a compact layout, which is conducive to improving space utilization, thereby facilitating improving the energy density and heat dissipation performance of the battery pack.

[0032] See also Figures 1 to 5 In this embodiment, an explosion-proof valve is provided on the bottom side of the battery cell group 1, and an exhaust structure 21 corresponding to the explosion-proof valve is provided on the side of the second liquid cooling plate 2 facing the explosion-proof valve.

[0033] Optionally, there are multiple exhaust structures 21 , and the multiple exhaust structures 21 are distributed along the parallel direction of the multiple battery cell groups 1 .

[0034] Optionally, the wall surface of the second liquid cooling plate 2 facing the explosion-proof valve is partially concave to form an exhaust structure 21. Further, the exhaust structure 21 cooperates with a part of the wall surface on the bottom side of the battery cell group 1 to define an exhaust channel suitable for exhausting the gas discharged from the explosion-proof valve, which is conducive to the flow of smoke along the exhaust channel, reduces the risk of smoke running around, and has good safety.

[0035] Optionally, the rear end beam 5 is provided with an exhaust portion suitable for discharging the smoke in the exhaust channel. That is to say, when the battery cell 11 has thermal runaway, the smoke discharged from the corresponding explosion-proof valve can flow through the exhaust channel and then be discharged through the rear end beam 5, which is conducive to simplifying the structure.

[0036] Optionally, the exhaust structure 21 extends along the stacking direction of the multiple battery cells 11 in the same battery cell group 1, that is, the exhaust channel defined by the exhaust structure 21 and a portion of the wall surface on the bottom side of the battery cell group 1 also extends along the stacking direction of the multiple battery cells 11 in the same battery cell group 1, so that the multiple battery cells 11 share the same exhaust channel, which has a simple structure and compact layout, and also facilitates the timely discharge of smoke exhausted by each battery cell 11.

[0037] The battery pack of the above embodiment is provided with an exhaust structure 21 on the second liquid cooling plate 2 corresponding to the bottom side of the battery cell group 1, which can discharge the gas discharged by the explosion-proof valve in time. The exhaust structure 21 is integrated on the second liquid cooling plate 2, and can exhaust gas while cooling, which simplifies the structure, improves space utilization, and ensures the heat dissipation performance of the battery pack, which is beneficial to improving the energy density and heat dissipation performance of the battery pack and reducing costs.

[0038] See also Figures 1 to 5 In some optional embodiments, first liquid cooling plates 3 are arranged on both sides of each battery cell group 1 along the parallel direction thereof, or in other words, there are multiple first liquid cooling plates 3, multiple first liquid cooling plates 3 are spaced apart along the parallel direction of multiple battery cell groups 1, and the battery cell group 1 is sandwiched between two adjacent first liquid cooling plates 3; wherein, a third cooling channel 31 for the flow of cooling medium is provided in the first liquid cooling plate 3. This structural layout enables the third liquid cooling plate, the second liquid cooling plate 2 and the first liquid cooling plate 3 to cooperate to realize four-side cooling of the battery cell group 1, and the cooling effect is good. It can be understood that in the present application, the side-by-side direction of the multiple battery cell groups 1, the arrangement direction of the multiple exhaust structures 21 and the distribution direction of the multiple first liquid cooling plates 3 are the same, that is, the Y direction in the accompanying drawings; the stacking direction of the multiple battery cells 11 in each battery cell group 1, the extension direction of each exhaust structure 21, the extension direction of each exhaust channel and the length direction of the first liquid cooling plate 3 are the same, that is, the X direction in the accompanying drawings; the distribution direction of the third liquid cooling plate and the second liquid cooling plate 2, the height direction of the battery cell group 1, the height direction of the battery cell 11 and the height direction of the first liquid cooling plate 3 are the same, that is, the Z direction in the accompanying drawings.

[0039] Optionally, a first cooling channel 23 staggered with the exhaust structure 21 is provided in the second liquid cooling plate 2 , and the cooling medium can flow in the first cooling channel 23 .

[0040] Optionally, the first liquid cooling plate 3 has a front end and a rear end distributed along its length direction, and the front ends of the plurality of first liquid cooling plates 3 are connected to the front end beam 4, and the rear ends of the plurality of first liquid cooling plates 3 are connected to the rear end beam 5, so that the connection is reliable and the structure is stable. Among them, the front end beam 4 is also connected to the second liquid cooling plate 2, that is, the front end beam 4 connects the plurality of first liquid cooling plates 3 and the second liquid cooling plate 2, or the plurality of first liquid cooling plates 3 and the second liquid cooling plates 2 can be connected through the front end beam 4. Further, a second cooling channel is provided in the front end beam 4, and the third cooling channels 31 in the plurality of first liquid cooling plates 3 and the first cooling channels 23 in the second liquid cooling plate 2 are connected through the second cooling channel in the front end beam 4 to form a circulating cooling channel, and the third cooling channels 31 in the plurality of first liquid cooling plates 3 and the first cooling channels 23 in the second liquid cooling plate 2 are connected in series and parallel through the front end beam 4, which is conducive to simplifying the structure and reducing the number of additional medium delivery pipelines and pipeline joints.

[0041] Specifically, the second cooling channel includes a liquid inlet manifold and a liquid outlet manifold. A liquid inlet joint connected to the liquid inlet manifold and a liquid outlet joint connected to the liquid outlet manifold are installed on the front end beam 4. The liquid inlet end of the third cooling channel 31 and the liquid inlet end of the first cooling channel 23 are both connected to the liquid inlet manifold. The liquid outlet end of the third cooling channel 31 and the liquid outlet end of the first cooling channel 23 are both connected to the liquid outlet manifold. The cooling medium can enter the liquid inlet manifold from the liquid inlet joint and flow to the liquid inlet end of the third cooling channel 31 in each first liquid cold plate 3 and the liquid inlet end of the first cooling channel 23 in the second liquid cold plate 2. The cooling medium flows out from the liquid outlet end of the third cooling channel 31 and the liquid outlet end of the first cooling channel 23 and then enters the liquid outlet manifold and is output through the liquid outlet joint. The cooperation of the first liquid cold plate 3, the second liquid cold plate 2 and the front end beam 4 is conducive to simplifying the structure of the cooling channel, improving the space utilization, and thus helping to improve the energy density of the battery pack.

[0042] See also Figures 1 to 5 In some optional embodiments, the second liquid cooling plate 2 includes a plurality of main board bodies 22 distributed along the side-by-side direction of the plurality of battery cell groups 1, two adjacent main board bodies 22 are spliced ​​and fixed, and an exhaust structure 21 is formed at the splicing position.

[0043] Optionally, each main board body 22 has a splicing end spliced ​​with an adjacent main board body 22, and the splicing end is provided with a notch 221 facing the explosion-proof valve, and the notch 221 of the main board body 22 and the notch 221 of the adjacent main board body 22 are sealed and spliced ​​to construct the exhaust structure 21. Further, the wall surface of the main board body 22 facing the explosion-proof valve is partially concave to form a notch 221.

[0044] Optionally, the exhaust structure 21 may be a trough body. Furthermore, the trough body may be a trapezoidal trough with a longitudinal section that is wide at the top and narrow at the bottom and whose opening faces the explosion-proof valve, that is, the width of the trough body at one end close to the explosion-proof valve is wider than the width of the trough body at the end away from the explosion-proof valve, or in other words, the width of the air inlet end of the trough body is wider than other positions, which is conducive to guiding the smoke to fully enter the trough body and reduce the risk of smoke running wildly; further, the trapezoidal trough may be an isosceles trapezoidal trough, which has a symmetrical structure, is convenient for batch production and processing, has high compatibility, and is simpler and more convenient to assemble. It is understandable that the trough body is not limited to a trapezoidal trough, for example, it may also be a U-trough or a trough body of other shapes, which can guide the smoke to flow along a specified path.

[0045] Optionally, the joints of two adjacent main board bodies 22 are fixed and sealed by welding, which has a simple connection method, a reliable connection and good sealing performance.

[0046] Optionally, the first liquid cooling plate 3 is connected to the main board body 22 in an inverted T shape. The first liquid cooling plate 3 can be extruded integrally with the main board body 22. During the assembly process, the first liquid cooling plate 3 can be extruded integrally with the main board body 22, and then the structural parts composed of multiple first liquid cooling plates 3 and the main board body 22 are assembled and welded, and the assembly is flexible, convenient, simple, and efficient.

[0047] In the battery pack of the above embodiment, the exhaust structure 21 is formed by splicing the notches 221 of adjacent main board bodies 22, and the processing difficulty is low; in addition, the number of main board bodies 22 can be increased or decreased according to demand, the splicing is flexible, and the application range is wider.

[0048] In the battery pack of the utility model, the first liquid cooling plate 3 and the second liquid cooling plate 2 cooperate to cool at least three sides of the battery cell group 1, and the cooling effect is good. In addition, the first liquid cooling plate 3 and the second liquid cooling plate 2 are extruded as one piece, and the structure is simple, the layout is compact, and the assembly efficiency is high, which is conducive to simplifying the structure and improving the space utilization, thereby improving the energy density of the battery pack and reducing the cost.

[0049] In the description of this specification, the description with reference to the terms "this embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: A plurality of battery cell groups, wherein the plurality of battery cell groups are arranged side by side; A first liquid cooling plate, wherein the first liquid cooling plate is sandwiched between two adjacent battery cell groups; as well as The second liquid cooling plate is located at the bottom side of the battery cell group and is formed as an integrally extruded structural component with the first liquid cooling plate.

2. The battery pack according to claim 1, characterized in that: An explosion-proof valve is provided on the bottom side of the battery cell group, and an exhaust structure corresponding to the explosion-proof valve is provided on the side of the second liquid cooling plate facing the explosion-proof valve.

3. The battery pack according to claim 2, characterized in that: The wall surface of the second liquid cooling plate facing the explosion-proof valve is partially concave to form the exhaust structure, and the exhaust structure cooperates with a part of the wall surface on the bottom side of the battery cell group to define an exhaust channel suitable for exhausting the gas exhausted by the explosion-proof valve.

4. The battery pack according to claim 2, characterized in that: Each of the battery cell groups includes a plurality of stacked battery cells, and the exhaust structure extends along a stacking direction of the plurality of battery cells in the same battery cell group.

5. The battery pack according to any one of claims 2 to 4, characterized in that: The second liquid cooling plate includes a plurality of main board bodies distributed along the parallel direction of the plurality of battery cell groups, two adjacent main board bodies are spliced ​​and fixed, and the exhaust structure is formed at the splicing position.

6. The battery pack according to claim 5, characterized in that: Each main plate body has a splicing end spliced ​​with an adjacent main plate body, and the splicing end is provided with a notch facing the explosion-proof valve. The notch of the main plate body and the notch of the adjacent main plate body are sealed and spliced ​​to construct the exhaust structure.

7. The battery pack according to claim 5, characterized in that: The first liquid cooling plate is connected to the main board body in an inverted T shape.

8. The battery pack according to claim 3, characterized in that: The battery pack further comprises a rear end beam, on which is provided an exhaust portion suitable for exhausting smoke in the exhaust channel.

9. The battery pack according to claim 2, characterized in that: The second liquid cooling plate is provided with a first cooling channel which is staggered with the exhaust structure.

10. The battery pack according to claim 9, characterized in that: The battery pack also includes a front end beam having a second cooling channel, the front end beam connecting the plurality of first liquid cooling plates and the second liquid cooling plates, the third cooling channels in the plurality of first liquid cooling plates and the first cooling channels in the second liquid cooling plates are connected through the second cooling channels in the front end beam to form a circulating cooling channel.

11. The battery pack according to claim 1, characterized in that: The first liquid cooling plates are arranged on both sides of each of the battery cell groups.

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