Battery pack

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery pack. Comprising a bottom plate and a battery cell group, the battery cell group is placed on the bottom plate, the bottom side of the battery cell group faces the bottom plate, and the bottom side of the battery cell group is provided with a pole and an anti-explosion valve; a plurality of universal grooves are formed in the bottom plate, one part of the universal grooves are configured to be positioning structures corresponding to the pole columns, and the other part of the universal grooves are configured to be exhaust structures corresponding to the anti-explosion valves. The battery pack disclosed by the utility model at least has the following beneficial effects that the universal matching groove is formed in the bottom plate of the battery pack, the battery pack is simple in structure and convenient to produce and process, the positioning assembly of the pole and the bottom plate can be met, smoke discharged by the anti-explosion valve can be smoothly discharged, the assembly efficiency and the safety performance of the battery pack are improved, and the battery pack is suitable for popularization and application. And the cost of the battery pack is reduced.

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] In order to meet the needs of use, a battery pack generally needs to be equipped with multiple battery cells. When assembling the battery cells with the bottom plate of the battery pack, both assembly efficiency and safety performance must be considered. In particular, when the battery cell's pole and explosion-proof valve are on the same side, it is necessary to consider the positioning and assembly of the pole to avoid affecting the normal operation of the pole, and to ensure that the smoke can be discharged smoothly when thermal runaway occurs in the battery cell. This puts high demands on the bottom plate structure of the battery pack. The structure of the bottom plate of a traditional battery pack is complex and costly, making it difficult to meet the needs of use. 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 complex bottom plate structure and high cost of the battery pack in the prior art, so as to reduce the cost 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] Base plate; and

[0006] A battery cell group, the battery cell group is placed on the bottom plate, the bottom side of the battery cell group faces the bottom plate, and the bottom side of the battery cell group is provided with a pole and an explosion-proof valve;

[0007] Wherein, a plurality of general-purpose grooves are arranged on the bottom plate, a part of the general-purpose grooves are configured as positioning structures corresponding to the poles, and another part of the general-purpose grooves are configured as exhaust structures corresponding to the explosion-proof valves.

[0008] Optionally, the bottom plate includes a plurality of main plate bodies that are spliced ​​and arranged, and the pass-through groove is arranged on a side of the main plate body that faces the battery cell group.

[0009] Optionally, there are multiple battery cell groups, the multiple battery cell groups are arranged side by side, and the multiple main board bodies are laid flat and welded along the side-by-side direction of the multiple battery cell groups.

[0010] Optionally, the battery pack further includes a liquid-cooling partition having a first cooling channel, and the number of the battery cell groups is multiple, and the liquid-cooling partition is arranged between two adjacent battery cell groups.

[0011] Optionally, the battery pack also includes a front end beam having a second cooling channel, a plurality of the liquid cooling baffles are connected to the front end beam, and the first cooling channels in the plurality of the liquid cooling baffles are connected through the second cooling channels in the front end beam to form a circulating cooling channel.

[0012] Optionally, the splicing position of two adjacent main board bodies corresponds to the liquid cooling partition.

[0013] Optionally, the exhaust structure cooperates with a portion of the bottom wall of the battery cell group to define an exhaust passage suitable for exhausting smoke exhausted by the explosion-proof valve.

[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, the battery cell group includes a plurality of stacked battery cells, and the exhaust structure and the positioning structure extend respectively along a stacking direction of the plurality of battery cells in the battery cell group.

[0016] Optionally, the main board body comprises an extruded profile.

[0017] Optionally, the battery pack further includes a liquid-cooled top plate, and the liquid-cooled top plate is located on the top side of the battery cell group.

[0018] As described above, the battery pack of the utility model has at least the following beneficial effects: the poles and the explosion-proof valves of the battery cell group are on the same side and both face the bottom plate of the battery pack; based on this, a universal universal groove is provided on the bottom plate, which has a simple structure and is convenient for production and processing, and can not only meet the positioning and assembly of the poles and the bottom plate, but also smoothly discharge the smoke discharged by the explosion-proof valve, thereby improving the assembly efficiency and safety performance of the battery pack and reducing the cost of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A top view of a local structure of a battery pack according to an embodiment of the present utility model;

[0020] Figure 2 for Figure 1 Sectional view at AA in the middle;

[0021] Figure 3 for Figure 2 A magnified schematic diagram of the part B in the middle;

[0022] Figure 4 for Figure 1 Schematic diagram of the structure of the midsole plate.

[0023] Part Number Description

[0024] Bottom plate 1, main body 11, positioning structure 111, exhaust structure 112, splicing position 113, battery cell group 2, battery cell 21, pole 22, explosion-proof valve 23, front end beam 3, rear end beam 4. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] See also Figures 1 to 4 In some optional embodiments, the present application provides a battery pack, including a bottom plate 1 and a battery cell group 2; in addition to the above components, the battery pack may also include a liquid-cooled top plate (not shown) and / or a liquid-cooled partition (not shown) and / or a front beam 3 and / or a rear beam 4. The battery cell group 2 is placed on the bottom plate 1, with the bottom side of the battery cell group 2 facing the bottom plate 1, and a pole 22 and an explosion-proof valve 23 are provided on the bottom side of the battery cell group 2; a plurality of general-matching grooves are provided on the bottom plate 1, a part of the general-matching grooves are configured as a positioning structure 111 corresponding to the pole 22, and the positioning structure 111 is suitable for positioning and assembling with the pole 22, and another part of the general-matching grooves are configured as an exhaust structure 112 corresponding to the explosion-proof valve 23, and the exhaust structure is suitable for exhausting the smoke discharged by the explosion-proof valve 23.

[0028] Optionally, there are multiple cell groups 2, multiple cell groups 2 are arranged side by side, there are multiple pass-through slots, and multiple pass-through slots are arranged along the side-by-side direction of multiple cell groups 2. Each cell group 2 includes multiple stacked cells 21, the bottom side of the cell 21 is on the same side as the bottom side of the cell group 2, and each cell 21 is provided with a pole 22 and an explosion-proof valve 23 on the bottom side; wherein, a liquid cooling partition is provided between two adjacent cell groups 2 and can be separated by the liquid cooling partition, the liquid cooling partition has a first cooling channel, and the cooling medium can flow in the first cooling channel in the liquid cooling partition. Furthermore, each cell group 2 is provided with liquid cooling partitions on both sides distributed along the side-by-side direction of the multiple cell groups 2 and facing each other, or in other words, there are multiple liquid cooling partitions, and the cell group 2 is sandwiched between two adjacent liquid cooling partitions to achieve double-sided cooling of the cell group 2, which is beneficial to improving the cooling effect.

[0029] Optionally, the exhaust structure 112 and the positioning structure 111 extend along the stacking direction of the multiple battery cells 21 in the battery cell group 2, respectively, or in other words, the general groove extends along the stacking direction of the multiple battery cells 21 in each battery cell group 2, so that the multiple battery cells 21 in the same battery cell group 2 can share the corresponding exhaust structure 112 and the positioning structure 111, which is conducive to simplifying the structure, facilitating processing, and simple and convenient assembly at low cost.

[0030] It can be understood that in the present application, the side-by-side direction of the multiple battery cell groups 2, the arrangement direction of the multiple pass-through grooves and the arrangement direction of the multiple liquid-cooling partitions are the same, that is, the Y direction in the accompanying drawings; the stacking direction of the multiple battery cells 21 in each battery cell group 2, the extension direction of the pass-through grooves, the length direction of the liquid-cooling partition and the extension direction of the liquid-cooling partition are the same, that is, the X direction in the accompanying drawings; the height direction of the battery cell group 2, the height direction of the battery cell 21 and the height direction of the liquid-cooling partition are the same, that is, the Z direction in the accompanying drawings.

[0031] The battery pack of the above-mentioned embodiment can form a positioning structure 111 and an exhaust structure 112 corresponding to the pole 22 and the explosion-proof valve 23 respectively by arranging a universal groove on the bottom plate 1. The battery pack has a simple structure, high versatility, and is easy to process and form, which is beneficial to improving the production efficiency of the battery pack and reducing the cost. In addition, when the pole 22 and the positioning structure 111 are assembled in place, the explosion-proof valve 23 can also be aligned with the exhaust structure 112, which not only solves the problem of difficult positioning of the battery cell group 2 during assembly and ensures product quality and assembly efficiency, but also solves the problem of difficult exhaust of smoke when thermal runaway occurs in the battery cell group 2, reduces the risk of thermal runaway spreading, improves the safety performance of the battery pack and reduces the cost.

[0032] See also Figures 1 to 4 In some optional embodiments, the bottom plate 1 includes a plurality of main plate bodies 11 that are spliced ​​and arranged, and the pass-through groove is arranged on a side of the main plate body 11 that faces the battery cell group 2 .

[0033] Optionally, the wall surface of the main board body 11 facing the battery cell group 2 is partially concave to form a plurality of pass-through grooves, and the plurality of pass-through grooves are arranged along the side-by-side direction of the plurality of battery cell groups 2, and each pass-through groove extends along the stacking direction of the plurality of battery cells 21 in each battery cell group 2.

[0034] Optionally, the main board body 11 includes an extruded profile, which is simple and convenient to mold and manufacture.

[0035] Optionally, multiple main board bodies 11 are laid flat along the parallel direction of multiple battery cell groups 2 and welded and fixed, and the connection is simple and firm. Further, the splicing position 113 of two adjacent main board bodies 11 corresponds to the liquid cooling partition, that is, the orthographic projection of at least part of the liquid cooling partition on the bottom plate 1 covers the splicing position 113 of the two adjacent main board bodies 11, or in other words, the splicing position 113 of the two adjacent main board bodies 11 is staggered with the battery cell group 2, which is not only convenient for assembly, but also helps to avoid affecting the battery cell group 2.

[0036] In the battery pack of the above embodiment, the bottom plate 1 can be spliced ​​together by a plurality of main board bodies 11, so that the number of main board bodies 11 can be increased or decreased according to demand, the splicing is flexible, and the assembly is simple and convenient to meet the assembly requirements of different numbers of battery cell groups 2, and each main board body 11 can be processed separately, with low processing difficulty.

[0037] See also Figure 1 and Figure 4 In some optional embodiments, the liquid cooling baffle has a front end and a rear end distributed along its length direction, the front ends of the plurality of liquid cooling baffles are connected to the front end beam 3, and the rear ends of the plurality of liquid cooling baffles are connected to the rear end beam 4, the structure is stable, the front end beam 3 has a second cooling channel, the second cooling channel includes a liquid inlet manifold and a liquid outlet manifold, the front end beam 3 is provided with a liquid inlet joint connected to the liquid inlet manifold and a liquid outlet joint connected to the liquid outlet manifold, and the first cooling channels in the plurality of liquid cooling baffles are connected through the second cooling channels in the front end beam 3 to form a circulating cooling channel. The second cooling channels in the plurality of liquid cooling baffles are connected in series and parallel through the front end beam 3, which is conducive to simplifying the structure and reducing the number of additional medium delivery pipelines and pipeline joints. Specifically, the cooling medium can enter the liquid inlet manifold from the liquid inlet joint and then flow to the liquid inlet end of the first cooling channel in each liquid cooling baffle, and the cooling medium flows out from the liquid outlet end of the first cooling channel into the liquid outlet manifold and is output through the liquid outlet joint.

[0038] See also Figures 1 to 4 In some optional embodiments, the exhaust structure 112 cooperates with a portion of the bottom wall of the battery cell group 2 to define an exhaust passage suitable for discharging the smoke exhausted by the explosion-proof valve 23, which is conducive to the flow of smoke along the exhaust passage and reduces the risk of smoke running around.

[0039] Optionally, the rear end beam 4 is provided with an exhaust portion suitable for discharging the smoke in the exhaust channel. That is to say, when the battery cell 21 has thermal runaway, the smoke discharged from the corresponding explosion-proof valve 23 can flow through the exhaust channel and be discharged through the rear end beam 4, which is conducive to simplifying the structure.

[0040] See also Figure 1 and Figure 2In some optional embodiments, the liquid-cooled top plate is located on the top side of the battery cell group 2, and a third cooling channel for the flow of cooling medium is provided in the liquid-cooled top plate. The liquid-cooled top plate and the liquid-cooled partition cooperate to realize three-side cooling of the battery cell group 2, which is beneficial to further improve the cooling effect.

[0041] In the battery pack of the utility model, the pole 22 and the explosion-proof valve 23 of the battery cell group 2 are distributed on the same side and are arranged toward the bottom plate 1, with a compact layout. The battery cell group 2 can be positioned and vented through the bottom plate 1, and the assembly is simple, which reduces the structural requirements for other components. In addition, a universal groove suitable for forming a positioning structure 111 and an exhaust structure 112 is provided on the bottom plate, and the universal groove can meet the structural requirements of the positioning structure 111 and the structural requirements of the exhaust structure 112. The structure is simple, which is conducive to batch centralized processing, has low processing difficulty and high production efficiency, and is conducive to improving the production efficiency and reducing costs of the battery pack while ensuring product quality and safety performance.

[0042] 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.

[0043] 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: Base plate; as well as A battery cell group, the battery cell group is placed on the bottom plate, the bottom side of the battery cell group faces the bottom plate, and the bottom side of the battery cell group is provided with a pole and an explosion-proof valve; Wherein, a plurality of general-purpose grooves are arranged on the bottom plate, a part of the general-purpose grooves are configured as positioning structures corresponding to the poles, and another part of the general-purpose grooves are configured as exhaust structures corresponding to the explosion-proof valves.

2. The battery pack according to claim 1, characterized in that: The bottom plate includes a plurality of main plate bodies that are spliced ​​and arranged, and the through slot is arranged on a side of the main plate body that faces the battery cell group.

3. The battery pack according to claim 2, characterized in that: There are multiple battery cell groups, which are arranged side by side, and multiple main board bodies are laid flat and welded along the side-by-side direction of the multiple battery cell groups.

4. The battery pack according to claim 2, characterized in that: The battery pack further includes a liquid cooling baffle having a first cooling channel. There are multiple battery cell groups, and the liquid cooling baffle is disposed between two adjacent battery cell groups.

5. The battery pack according to claim 4, characterized in that: The battery pack also includes a front end beam having a second cooling channel, a plurality of the liquid cooling baffles are connected to the front end beam, and the first cooling channels in the plurality of the liquid cooling baffles are connected through the second cooling channels in the front end beam to form a circulating cooling channel.

6. The battery pack according to claim 4, characterized in that: The splicing positions of two adjacent main board bodies correspond to the liquid cooling baffle.

7. The battery pack according to claim 1, characterized in that: The exhaust structure cooperates with a portion of the bottom wall of the battery cell group to define an exhaust passage suitable for exhausting the smoke exhausted by the explosion-proof valve.

8. The battery pack according to claim 7, 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 1, characterized in that: The battery cell group includes a plurality of stacked battery cells, and the exhaust structure and the positioning structure extend respectively along a stacking direction of the plurality of battery cells in the battery cell group.

10. The battery pack according to claim 2, characterized in that: The main board body comprises an extruded profile.

11. The battery pack according to claim 1, characterized in that: The battery pack further comprises a liquid-cooled top plate, which is located on the top side of the battery cell group.

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