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 cooling bottom plate, a cooling partition plate and a cooling end beam, wherein a first cooling flow channel is formed in the cooling bottom plate; second cooling runners are arranged in the cooling partition plates, the battery cell groups are placed on the cooling bottom plate, and the cooling partition plates are arranged between at least part of adjacent battery cell groups; the cooling end beam is arranged on the cooling bottom plate and fixedly connected with the cooling partition plate and the cooling bottom plate, and a first cooling flow channel in the cooling bottom plate is communicated with a second cooling flow channel in the cooling partition plate in parallel through the cooling end beam. The cooling bottom plate and the cooling partition plate are matched to cool the battery cell group, so that the cooling effect is improved; the first cooling flow channel in the cooling bottom plate and the second cooling flow channel in the cooling partition plate are communicated in parallel through the cooling end beam, redundant medium conveying pipelines and nozzle connectors do not need to be additionally arranged, the number of parts is reduced, the structure is simplified, and the space utilization rate and the energy density of the battery pack are 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] The battery cells of the battery pack will emit heat during use. In order to ensure the stable operation of the battery pack, a cooling system is generally required in the battery pack to improve the heat dissipation effect of the battery pack. At present, the traditional cooling system has many pipes. Although it can achieve heat dissipation, it has a complex structure and occupies a large space, which reduces the space utilization rate of the battery pack and the energy density 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 problem of complex cooling system structure and large space occupation of the battery pack in the prior art, so as to improve the space utilization and energy density 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] Multiple battery packs;

[0006] A cooling bottom plate, wherein a first cooling channel is provided in the cooling bottom plate;

[0007] A cooling baffle, wherein a second cooling channel is disposed in the cooling baffle, the battery cell groups are placed on the cooling bottom plate, and the cooling baffle is disposed between at least some adjacent battery cell groups; and

[0008] A cooling end beam is placed on the cooling bottom plate and fixedly connected to the cooling baffle and the cooling bottom plate. The first cooling channel in the cooling bottom plate and the second cooling channel in the cooling baffle are connected in parallel through the cooling end beam.

[0009] Optionally, a separated liquid inlet manifold and liquid outlet manifold are provided in the cooling end beam, the liquid inlet end of the first cooling channel and the liquid inlet end of the second cooling channel are both connected to the liquid inlet manifold, and the liquid outlet end of the first cooling channel and the liquid outlet end of the second cooling channel are both connected to the liquid outlet manifold.

[0010] Optionally, the cooling end beam has a cavity therein, and a partition is installed in the cavity which can separate the cavity into two independent collecting chambers, one of the two collecting chambers is formed as the liquid inlet collecting chamber, and the other is formed as the liquid outlet collecting chamber.

[0011] Optionally, one of the two manifolds surrounds at least a portion of the other manifold.

[0012] Optionally, one of the manifolds and a portion of another manifold are distributed along the height direction of the cooling end beam, and are distributed along the width direction of the cooling end beam with another portion of the other manifold.

[0013] Optionally, the longitudinal cross-section of the cavity is square, the partition is in an inverted L-shape, the partition cooperates with a portion of the cavity wall of the cavity to define one of the collecting chambers with an inverted L-shape in the longitudinal cross-section, and the partition cooperates with another portion of the cavity wall of the cavity to define another collecting chamber with a square longitudinal cross-section.

[0014] Optionally, the manifold with an inverted L-shaped longitudinal section is formed as the liquid inlet manifold, and the manifold with a square longitudinal section is formed as the liquid outlet manifold.

[0015] Optionally, a first liquid inlet and a first liquid outlet are provided on the wall surface of the cooling end beam facing the cooling base plate, the first liquid inlet and the first liquid outlet are distributed along the width direction of the cooling end beam, and are staggered in the length direction of the cooling end beam, the liquid inlet end of the first cooling channel is connected to the liquid inlet collecting cavity through the first liquid inlet, and the liquid outlet end of the first cooling channel is connected to the liquid outlet collecting cavity through the first liquid outlet.

[0016] Optionally, a second liquid inlet and a second liquid outlet are provided on the wall surface of the cooling end beam facing the cooling baffle, and the second liquid inlet and the second liquid outlet are distributed along the height direction of the cooling end beam. The liquid inlet end of the second cooling channel is connected to the liquid inlet collecting cavity through the second liquid inlet, and the liquid outlet end of the second cooling channel is connected to the liquid outlet collecting cavity through the second liquid outlet.

[0017] Optionally, the second cooling channel is in a U-shaped structure with its opening facing the cooling end beam.

[0018] Optionally, a liquid inlet joint and a liquid outlet joint are connected to the cooling end beam, the liquid inlet joint is communicated with the liquid inlet manifold, and the liquid outlet joint is communicated with the liquid outlet manifold.

[0019] Optionally, a plurality of battery cell groups are arranged side by side, and the cooling baffles are arranged on both sides of the battery cell groups along the side-by-side direction.

[0020] Optionally, the liquid inlet collecting chamber and the liquid outlet collecting chamber extend in the side-by-side direction of the multiple groups of battery cell groups, the liquid inlet ends of the second cooling channels of the multiple cooling baffles are connected to the same liquid inlet collecting chamber, and the liquid outlet ends of the second cooling channels of the multiple cooling baffles are connected to the same liquid outlet collecting chamber.

[0021] Optionally, the cooling baffle comprises a stamped plate, an aluminum extruded harmonica tube or a profile plate; the cooling base plate comprises a stamped plate, an aluminum extruded harmonica tube or a profile plate.

[0022] As described above, the battery pack of the utility model has at least the following beneficial effects: the cooling base plate and the cooling baffle cooperate to cool the battery cell group, which is beneficial to improving the cooling effect; based on this, the first cooling channel in the cooling base plate and the second cooling channel in the cooling baffle are connected in parallel through the cooling end beam, and there is no need to set up additional redundant medium delivery pipelines and nozzle joints, which is beneficial to reducing the number of components, simplifying the structure, and improving the space utilization and energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a partial structural schematic diagram of a battery pack of the utility model;

[0024] Figure 2 for Figure 1 Schematic diagram of the connection between the middle cooling bottom plate, cooling baffle and cooling end beam;

[0025] Figure 3 for Figure 2 An enlarged schematic diagram of a local A in FIG.

[0026] Figure 4 for Figure 2 Top view of the middle cooling bottom plate, cooling baffles and cooling end beams;

[0027] Figure 5 for Figure 4 Sectional view at the middle BB;

[0028] Figure 6 for Figure 5 A magnified schematic diagram of the local C in the middle;

[0029] Figure 7 for Figure 4 Sectional view at DD in the middle;

[0030] Figure 8 for Figure 4 Sectional view at EE;

[0031] Fig. 9 for Figure 2 Side view of the middle cooling base plate, cooling baffles and cooling end beams;

[0032] Fig.10 for Fig. 9 Cross-sectional view at FF;

[0033] Fig.11 for Figure 2 Schematic diagram of the distribution of the first cooling channel inside the middle cooling base plate.

[0034] Part Number Description

[0035] Cooling base plate 1, first cooling channel 11, cooling baffle 2, second cooling channel 21, cooling end beam 3, liquid inlet manifold 31, liquid outlet manifold 32, baffle 33, first liquid inlet 34, first liquid outlet 35, second liquid inlet 36, second liquid outlet 37, liquid inlet connector 41, liquid outlet connector 42, battery cell group 5. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] See also Figures 1 to 11 In some optional embodiments, the present application provides a battery pack, including multiple groups of battery cell groups 5, a cooling base plate 1, a cooling baffle 2, and a cooling end beam 3. Among them, the cooling base plate 1 is provided with a first cooling channel 11 for the flow of cooling medium, and the cooling baffle 2 is provided with a second cooling channel 21 for the flow of cooling medium; the battery cell groups 5 are placed on the cooling base plate 1, and a cooling baffle 2 is provided between at least some adjacent battery cell groups 5; the cooling end beam 3 is placed on the cooling base plate 1 and fixedly connected to the cooling baffle 2 and the cooling base plate 1, and the first cooling channel 11 in the cooling base plate 1 and the second cooling channel 21 in the cooling baffle 2 are connected in parallel through the cooling end beam 3.

[0039] Optionally, multiple groups of battery cell groups 5 are arranged side by side, and the battery cell groups 5 and the cooling bottom plate 1 can be bonded and fixed, and each group of battery cell groups 5 can include multiple battery cells stacked and arranged along the length direction of the cooling baffle 2. Cooling baffles 2 are arranged on both sides of the battery cell group 5 along the side-by-side direction, or in other words, the battery cell group 5 is sandwiched between two cooling baffles 2, and the cooling baffle 2 and the cooling bottom plate 1 cooperate to achieve three-sided cooling of the battery cell group 5, and the cooling effect is good.

[0040] Optionally, the cooling baffles 2 and the cooling end beams 3 may be arranged perpendicular to the cooling bottom plate 1 .

[0041] In the battery pack of the above embodiment, the cooling base plate 1 and the cooling baffle 2 cooperate to cool the battery cell group 5, which is beneficial to improving the cooling effect. The first cooling channel 11 in the cooling base plate 1 and the second cooling channel 21 in the cooling baffle 2 are connected in parallel through the cooling end beam 3, and there is no need to set up additional redundant medium delivery pipelines and nozzle joints, which is beneficial to reducing the number of components, simplifying the structure, and improving the space utilization and energy density of the battery pack.

[0042] See also Figures 1 to 11 In some optional embodiments, a separated liquid inlet manifold 31 and a liquid outlet manifold 32 are provided in the cooling end beam 3, and the liquid inlet end of the first cooling channel 11 and the liquid inlet end of the second cooling channel 21 are both connected to the liquid inlet manifold 31, that is, the first cooling channel 11 and the second cooling channel 21 can share the same liquid inlet manifold 31, and the liquid outlet end of the first cooling channel 11 and the liquid outlet end of the second cooling channel 21 are both connected to the liquid outlet manifold 32, that is, the first cooling channel 11 and the second cooling channel 21 can share the same liquid outlet manifold 32.

[0043] Optionally, the cooling baffle 2 includes a stamped plate, an aluminum extruded harmonica tube or a profile plate, which is simple and convenient to form and manufacture, and is conducive to forming a second cooling channel 21 in the cooling baffle 2.

[0044] Optionally, the cooling base plate 1 includes a stamping plate, an aluminum extruded harmonica tube or a profile plate, which is simple and convenient to form and manufacture, and is conducive to forming the first cooling channel 11 in the cooling base plate 1.

[0045] Optionally, the cooling end beam 3 and the cooling baffle 2 can be connected and fixed by brazing, and the cooling end beam 3 and the cooling bottom plate 1 can be connected and fixed by brazing, and the connection is firm and reliable with good sealing performance.

[0046] Optionally, the liquid inlet manifold 31 and the liquid outlet manifold 32 extend in the parallel direction of the multiple groups of battery core groups 5, and the liquid inlet ends of the second cooling channels 21 of the multiple cooling baffles 2 are connected to the same liquid inlet manifold 31, and the liquid outlet ends of the second cooling channels 21 of the multiple cooling baffles 2 are connected to the same liquid outlet manifold 32. Multiple cooling baffles 2 share the same liquid inlet manifold 31 and liquid outlet manifold 32, which can reduce the number of nozzle joints, which is conducive to simplifying the structure, improving space utilization and reducing costs.

[0047] Optional, see Figure 7 and Figure 8The cooling end beam 3 is connected with a liquid inlet joint 41 and a liquid outlet joint 42. The liquid inlet joint 41 is connected with the liquid inlet manifold 31. The liquid inlet manifold 31 is connected with the liquid inlet pipe through the liquid inlet joint 41. The liquid outlet joint 42 is connected with the liquid outlet manifold 32. The liquid outlet manifold 32 is connected with the liquid outlet pipe through the liquid outlet joint 42.

[0048] It can be understood that in the present application, the side-by-side direction of multiple groups of battery cell groups 5, the arrangement direction of multiple cooling baffles 2 and the length direction of the cooling end beam 3 are the same, that is, the Y direction in the accompanying drawings; the stacking direction of multiple battery cells in the same group of battery cell groups 5, the length direction of the cooling baffles 2 and the width direction of the cooling end beam 3 are the same, that is, the X direction in the accompanying drawings; the height direction of the cooling baffles 2 and the height direction of the cooling end beam 3 are the same, that is, the Z direction in the accompanying drawings.

[0049] The battery pack of the above-mentioned embodiment integrates a liquid inlet manifold 31 and a liquid outlet manifold 32 on the cooling end beam 3 that can be shared by the cooling baffle 2 and the cooling base plate 1, so that the first cooling channel 11 and the second cooling channel 21 can be connected in parallel through the same liquid inlet manifold 31 and the same liquid outlet manifold 32, which is beneficial to reducing the number of components, especially nozzle joints and medium delivery pipelines, simplifying the structure, and improving the space utilization and energy density of the battery pack.

[0050] See also Figure 3 , Figures 6 to 11 In some optional embodiments, the cooling end beam 3 has a cavity inside, and a partition 33 is installed in the cavity to separate the cavity into two independent collecting chambers, one of the two collecting chambers is formed as a liquid inlet collecting chamber 31, and the other is formed as a liquid outlet collecting chamber 32.

[0051] Optionally, one of the two manifolds surrounds at least a portion of the other manifold.

[0052] Optionally, one of the manifolds and a portion of the other manifold are distributed along the height direction of the cooling end beam 3, and are distributed along the width direction of the cooling end beam 3 with another portion of the other manifold. For example, one of the manifolds is the first manifold, and the other manifold is the second manifold, a portion of the first manifold and the second manifold are distributed along the height direction of the cooling end beam 3, and another portion of the first manifold and the second manifold are distributed along the width direction of the cooling end beam 3; or, a portion of the second manifold is located above or below the first manifold, and another portion of the second manifold is located on one side of the first manifold, that is, the second manifold surrounds a portion of the first manifold.

[0053] Optionally, the longitudinal section of the cavity is square, the partition 33 is inverted L-shaped, the partition 33 cooperates with a portion of the cavity wall to define one manifold with an inverted L-shaped longitudinal section, and the partition 33 cooperates with another portion of the cavity wall to define another manifold with a square longitudinal section. Further, the manifold with an inverted L-shaped longitudinal section is formed as the liquid inlet manifold 31, and the manifold with a square longitudinal section is formed as the liquid outlet manifold 32.

[0054] Optional, see Figure 3 , Fig.10 and Fig.11 A first liquid inlet 34 and a first liquid outlet 35 are provided on the wall surface of the cooling end beam 3 facing the cooling bottom plate 1. The first liquid inlet 34 and the first liquid outlet 35 are distributed along the width direction of the cooling end beam 3. The first liquid inlet 34 and the first liquid outlet 35 are staggered in the length direction of the cooling end beam 3. The liquid inlet end of the first cooling channel 11 is connected to the liquid inlet manifold 31 through the first liquid inlet 34, and the liquid outlet end of the first cooling channel 11 is connected to the liquid outlet manifold 32 through the first liquid outlet 35.

[0055] Optional, see Figure 6 A second liquid inlet 36 and a second liquid outlet 37 are provided on the wall surface of the cooling end beam 3 facing the cooling baffle 2. The second liquid inlet 36 and the second liquid outlet 37 are distributed along the height direction of the cooling end beam 3. The liquid inlet end of the second cooling channel 21 is connected to the liquid inlet manifold 31 through the second liquid inlet 36, and the liquid outlet end of the second cooling channel 21 is connected to the liquid outlet manifold 32 through the second liquid outlet 37.

[0056] Optionally, the second cooling channel 21 is in a U-shaped structure with its opening facing the cooling end beam 3 .

[0057] In this embodiment, the cooling medium enters the liquid inlet manifold 31 from the liquid inlet joint 41, a portion of the cooling medium in the liquid inlet manifold 31 enters the first cooling channel 11 from the first liquid inlet 34, then enters the liquid outlet manifold 32 from the first liquid outlet 35 and is output through the liquid outlet joint 42, another portion of the cooling medium in the liquid inlet manifold 31 enters the second cooling channel 21 from the second liquid inlet 36, then enters the liquid outlet manifold 32 from the second liquid outlet 37 and is output through the liquid outlet joint 42. It can be understood that the conveying direction of the cooling medium is not limited to the listed conveying directions, and can also be conveyed in the reverse direction, that is, the liquid inlet direction and the liquid outlet direction can be interchanged.

[0058] In the battery pack of the above embodiment, the internal structure of the cooling end beam 3 is simple, the layout of the liquid inlet manifold 31 and the liquid outlet manifold 32 is compact, and the molding is simple and convenient, which is conducive to improving space utilization and reducing costs.

[0059] In the battery pack of the utility model, the cooling base plate 1 and the cooling partition 2 are connected by the cooling end beam 3 and realize parallel connection between the first cooling channel 11 and the second cooling channel 21, which is beneficial to simplifying the structure and improving space utilization; and the cooling end beam 3 is integrated with a liquid inlet manifold 31 and a liquid outlet manifold 32, which further simplifies the structure, improves the compactness of the layout, reduces the use of medium conveying pipelines and nozzle joints, and is beneficial to reducing the cost of the battery pack and improving the energy density of the battery pack.

[0060] 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.

[0061] 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: Multiple battery packs; A cooling bottom plate, wherein a first cooling channel is provided in the cooling bottom plate; A cooling baffle, wherein a second cooling channel is provided in the cooling baffle, the battery cell groups are placed on the cooling bottom plate, and the cooling baffle is provided between at least some adjacent battery cell groups; as well as A cooling end beam is placed on the cooling bottom plate and fixedly connected to the cooling baffle and the cooling bottom plate. The first cooling channel in the cooling bottom plate and the second cooling channel in the cooling baffle are connected in parallel through the cooling end beam.

2. The battery pack according to claim 1, characterized in that: The cooling end beam is provided with a separated liquid inlet manifold and a liquid outlet manifold, the liquid inlet end of the first cooling channel and the liquid inlet end of the second cooling channel are both connected to the liquid inlet manifold, and the liquid outlet end of the first cooling channel and the liquid outlet end of the second cooling channel are both connected to the liquid outlet manifold.

3. The battery pack according to claim 2, characterized in that: The cooling end beam has a cavity in it, and a partition is installed in the cavity which can separate the cavity into two independent manifolds, one of the two manifolds is formed as the liquid inlet manifold, and the other is formed as the liquid outlet manifold.

4. The battery pack according to claim 3, characterized in that: One of the two manifolds surrounds at least a portion of the other manifold.

5. The battery pack according to claim 3 or 4, characterized in that: One of the manifolds and a portion of the other manifold are distributed along the height direction of the cooling end beam, and are distributed along the width direction of the cooling end beam with another portion of the other manifold.

6. The battery pack according to claim 3 or 4, characterized in that: The longitudinal section of the cavity is square, the partition is in an inverted L-shape, the partition cooperates with a portion of the cavity wall of the cavity to define a collecting cavity with one longitudinal section in an inverted L-shape, and the partition cooperates with another portion of the cavity wall of the cavity to define another collecting cavity with a square longitudinal section.

7. The battery pack according to claim 6, characterized in that: The manifold with an inverted L-shaped longitudinal section is formed as the liquid inlet manifold, and the manifold with a square longitudinal section is formed as the liquid outlet manifold.

8. The battery pack according to claim 2 or 3, characterized in that: A first liquid inlet and a first liquid outlet are provided on the wall surface of the cooling end beam facing the cooling bottom plate, the first liquid inlet and the first liquid outlet are distributed along the width direction of the cooling end beam, and are staggered in the length direction of the cooling end beam, the liquid inlet end of the first cooling channel is connected to the liquid inlet manifold through the first liquid inlet, and the liquid outlet end of the first cooling channel is connected to the liquid outlet manifold through the first liquid outlet.

9. The battery pack according to claim 2 or 3, characterized in that: A second liquid inlet and a second liquid outlet are provided on the wall surface of the cooling end beam facing the cooling baffle, and the second liquid inlet and the second liquid outlet are distributed along the height direction of the cooling end beam. The liquid inlet end of the second cooling channel is connected to the liquid inlet manifold through the second liquid inlet, and the liquid outlet end of the second cooling channel is connected to the liquid outlet manifold through the second liquid outlet.

10. The battery pack according to claim 1, characterized in that: The second cooling channel is in a U-shaped structure with an opening facing the cooling end beam.

11. The battery pack according to claim 2, characterized in that: A liquid inlet joint and a liquid outlet joint are connected to the cooling end beam, the liquid inlet joint is communicated with the liquid inlet manifold, and the liquid outlet joint is communicated with the liquid outlet manifold.

12. The battery pack according to claim 2, characterized in that: A plurality of battery cell groups are arranged side by side, and the cooling baffles are arranged on both sides of the battery cell groups along the side-by-side direction.

13. The battery pack according to claim 12, characterized in that: The liquid inlet manifold and the liquid outlet manifold extend in the side-by-side direction of the multiple groups of battery cell groups, the liquid inlet ends of the second cooling channels of the multiple cooling baffles are connected to the same liquid inlet manifold, and the liquid outlet ends of the second cooling channels of the multiple cooling baffles are connected to the same liquid outlet manifold.

14. The battery pack according to claim 1, characterized in that: The cooling baffle comprises a stamping plate, an aluminum extruded harmonica tube or a profile plate; the cooling bottom plate comprises a stamping plate, an aluminum extruded harmonica tube or a profile plate.

Images