Battery cell assembly, battery module and battery pack

Abstract

The utility model belongs to a battery cell assembly, a battery module and a battery pack in the technical field of power batteries. The battery cell assembly comprises: a battery cell group having two parallel and back-to-back first sides and a second side intersecting with the two first sides, the battery cell group comprising at least one battery cell stack; the two first cooling plates are provided with first cooling runners and are respectively positioned on two first sides of the battery cell group; the second cooling plate is provided with a plurality of second cooling flow channels and is positioned on the second side of the battery cell group, the liquid inlet end of the second cooling plate is connected with the liquid outlet end of the first cooling plate, and the plurality of second cooling flow channels respectively correspond to the first cooling flow channels in the two first cooling plates and are communicated with the first cooling flow channels in the two first cooling plates to form a plurality of parallel cooling loops. The first cooling plate and the second cooling plate are connected and matched, so that pipe nozzle sharing, pipeline structure simplification and cost reduction are facilitated, three-side cooling of the battery cell group is realized, and the cooling effect is good; the multiple cooling loops are connected in parallel, cooling is uniform, and the cooling effect is further improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power battery technical field, especially a kind of battery cell assembly, battery module and battery pack. BACKGROUND

[0002] Since the battery cell of battery pack emits heat in use process, to ensure safety, the temperature inside battery pack needs to be adjusted, so as to maintain in certain temperature range. At present, the battery cell is cooled by the liquid cooling plate of cooling system, but the number of traditional cooling system liquid cooling plate is large, and each liquid cooling plate needs to be separately provided with inlet and outlet water nozzle, so the pipeline is complex and the cost is high. UTILITY MODEL CONTENTS

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a battery cell assembly, a battery module and a battery pack, to solve the problem of complex pipeline and high cost of the cooling system in the prior art.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a battery cell assembly, comprising:

[0005] A battery cell group has two parallel and opposite first sides and a second side intersecting with the two first sides, the second side is the top side or the bottom side of the battery cell group, the battery cell group comprises at least one battery cell stack, and each battery cell stack has a plurality of stacked battery cells.

[0006] Two first cooling plates are respectively located at two first sides of the battery cell group, the first cooling plate is arranged along the stacking direction of the plurality of battery cells in the battery cell stack, and the first cooling plate is provided with a first cooling flow channel;

[0007] A second cooling plate is located at the second side of the battery cell group, the liquid inlet end of the second cooling plate is connected with the liquid outlet end of the first cooling plate, the second cooling plate is provided with a plurality of second cooling flow channels, and the plurality of second cooling flow channels correspond to and communicate with the first cooling flow channels in the two first cooling plates to form a plurality of parallel cooling circuits.

[0008] Optionally, the liquid outlet end of the two first cooling plates and the liquid inlet end of the second cooling plate are located at the same end of the battery cell group and are connected by the same connecting current collector, and the connecting current collector is provided with a connecting current collector channel communicating the first cooling flow channel and the second cooling flow channel.

[0009] Optionally, the cross section of the connecting current collector is in U-shaped structure.

[0010] Optionally, the liquid inlet end of the first cooling plate is provided with a liquid inlet manifold, the first cooling flow channel arranged in the first cooling plate is in plurality, and the liquid inlet nozzle is communicated with the plurality of first cooling flow channels through the liquid inlet manifold.

[0011] Optionally, the liquid outlet end of the second cooling plate is provided with a liquid outlet manifold, and the liquid outlet nozzle is communicated with the plurality of second cooling flow channels through the liquid outlet manifold.

[0012] Optionally, the liquid inlet manifold and the liquid outlet manifold are located at the same end of the battery cell group.

[0013] Optionally, the first cooling plate and the second cooling plate are both mouth organ tubes.

[0014] Optionally, the second side of the battery cell group is provided with an explosion-proof valve, the second cooling plate comprises a plurality of cooling plate bodies distributed at intervals, and the explosion-proof valve is directed towards the second cooling plate and corresponds to the gap between the adjacent two cooling plate bodies.

[0015] Optionally, the battery cell group comprises N battery cell stacks, the second cooling plate comprises 2N or N+1 cooling plate bodies, N is a natural number greater than or equal to 2, and the plurality of cooling plate bodies are distributed along the arrangement direction of the plurality of battery cell stacks.

[0016] To achieve the above object and other related objects, the application further provides a battery module comprising the battery cell assembly.

[0017] To achieve the above object and other related objects, the application further provides a battery pack comprising the battery cell assembly.

[0018] As described above, the battery cell assembly, the battery module and the battery pack have at least the following beneficial effects: the first cooling plate and the second cooling plate are connected and matched, which not only facilitates the sharing of the nozzle, simplifies the pipeline structure and reduces the cost, but also enables the cooling medium to flow from the side of the battery cell group to the top surface or the bottom surface of the battery cell group, realizes three-surface cooling of the battery cell group, and has good cooling effect; in addition, the plurality of cooling circuits are connected in parallel, the cooling is uniform, and the cooling effect is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the battery cell assembly of the utility model embodiment one;

[0020] Figure 2 It is Figure 1 It is a front view of the battery cell assembly;

[0021] Figure 3 for Figure 1 Top view of the battery cell assembly;

[0022] Figure 4 for Figure 3 Sectional view at point AA;

[0023] Figure 5 for Figure 3 Sectional view at point BB;

[0024] Figure 6 for Figure 1 A bottom view of a battery cell assembly;

[0025] Figure 7 for Figure 1 Side view of a battery cell assembly;

[0026] Figure 8 This is a bottom view of Embodiment 2 of the battery cell assembly of this utility model;

[0027] Figure 9 This is a first-view structural schematic diagram of the battery cell assembly of this utility model in Embodiment 3;

[0028] Figure 10 This is a second-view structural schematic diagram of the battery cell assembly of this utility model in Embodiment 3;

[0029] Figure 11 for Figure 9 Top view of the battery cell assembly;

[0030] Figure 12 for Figure 9 A bottom view of a battery cell assembly;

[0031] Figure 13 This is a schematic diagram of the structure of the battery cell assembly of this utility model in embodiment four;

[0032] Figure 14 for Figure 13 Top view of the battery cell assembly;

[0033] Figure 15 for Figure 14 Sectional view at CC;

[0034] Figure 16 for Figure 13 A bottom view of a battery cell assembly;

[0035] Figure 17 for Figure 13 Side view of a battery cell assembly;

[0036] Figure 18 This is a bottom view of Embodiment 5 of the battery cell assembly of this utility model;

[0037] Figure 19 Structure diagram of the sixth embodiment of the battery cell assembly of the utility model;

[0038] Figure 20 For Figure 19 The bottom view of the battery cell assembly.

[0039] Part number explanation

[0040] Battery cell group 1, battery cell stack 11, battery cell 111, first cooling plate 2, first cooling flow channel 21, second cooling plate 3, second cooling flow channel 31, cooling plate body 32, connecting current collector 4, connecting current collector channel 41, liquid inlet current collector 5, liquid inlet nozzle 51, liquid outlet current collector 6, liquid outlet nozzle 61, liquid outlet current collector channel 62, explosion-proof valve 7. DETAILED DESCRIPTION

[0041] The following specific embodiments illustrate the implementation of the utility model, and those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification.

[0042] It is understood that the structure, proportion, size, etc. shown in the drawings attached to the specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the implementation conditions of the utility model, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that the utility model can produce, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" in the specification are only for the convenience of clear description, and are not used to limit the scope of the utility model, the change or adjustment of the relative relationship, without substantial change of technical content, is also regarded as the scope of the utility model.

[0043] Referring to Figures 1 to 9 And Figure 13In some optional embodiments, the application provides an electric cell assembly, which comprises an electric cell group 1, two first cooling plates 2 and a second cooling plate 3. The electric cell group 1 has two parallel and opposite first sides and a second side intersecting the two first sides of the electric cell group 1, that is, the second side of the electric cell group 1 can be located between and connected to the two first sides of the electric cell group 1, and can be the top side or the bottom side of the electric cell group 1. The electric cell group 1 comprises at least one electric cell stack 11, and each electric cell stack 11 has a plurality of electric cells 111 arranged in a stack. The electric cell 111 comprises a square can cell. The two first cooling plates 2 are respectively located at the two first sides of the electric cell group 1, and the first cooling plate 2 is arranged in an extending manner along the stacking direction of the plurality of electric cells 111 in the electric cell stack 11, and the first cooling plate 2 is provided with a first cooling flow channel 21 for conveying a cooling medium. The second cooling plate 3 is located at the second side of the electric cell group 1, and the second cooling plate 3 is arranged in an extending manner along the stacking direction of the plurality of electric cells 111 in the electric cell stack 11. The liquid inlet end of the second cooling plate 3 is connected to the liquid outlet end of the first cooling plate 2. The second cooling plate 3 is provided with a plurality of second cooling flow channels 31 for conveying the cooling medium. The plurality of second cooling flow channels 31 are arranged in parallel, and the plurality of second cooling flow channels 31 are distributed along the length direction of the electric cell 111. The plurality of second cooling flow channels 31 correspond to and communicate with the first cooling flow channels 21 in the two first cooling plates 2 to form a plurality of parallel cooling circuits. The cooling medium flows along the cooling circuit. Specifically, the cooling medium can be conveyed from the first cooling flow channels 21 of the two first cooling plates 2 into the second cooling flow channels 31 in the second cooling plate 3, and the cooling is uniform.

[0044] In the application, the stacking direction of the plurality of electric cells 111 in each electric cell stack 11, the extending direction of the first cooling plate 2, the extending direction of the second cooling plate 3 and the thickness direction of the electric cell 111 are the same, that is, the X direction in the drawings; the height direction of the electric cell stack 11, the height direction of the first cooling plate 2 and the height direction of the electric cell 111 are the same, that is, the Z direction in the drawings; the distribution direction of the first cooling plate 2 and the second cooling plate 3, the distribution direction of the plurality of second cooling flow channels 31, the distribution direction of the plurality of electric cell stacks 11 and the length direction of the electric cell 111 are the same, that is, the Y direction in the drawings.

[0045] Optionally, the liquid outlet ends of the two first cooling plates 2 and the liquid inlet end of the second cooling plate 3 are located at the same end of the battery cell group 1 and are connected by the same connecting current collector 4, and the connecting current collector 4 is provided with a connecting current collector channel 41 communicating the first cooling flow channel 21 and the second cooling flow channel 31. Further, the cross section of the connecting current collector 4 is in a U-shaped structure. The first cooling plate 2 and the second cooling plate 3 are connected by the same connecting current collector 4, which is simple in structure and convenient to assemble, and the two first cooling plates 2 can share the second cooling plate 3, which is conducive to reducing the number of connecting points and nozzles, and connecting together is conducive to realizing the integrated design of the module, and is also conducive to improving the rigidity of the overall structure.

[0046] Optionally, the liquid inlet end of the first cooling plate 2 is provided with a liquid inlet current collector 5, and the first cooling flow channel 21 provided in the first cooling plate 2 is in multiple, and the multiple first cooling flow channels 21 are arranged in parallel and distributed along the height direction of the battery cell 111. The liquid inlet current collector 5 has a liquid inlet nozzle 51 and a liquid inlet current collector channel, and the liquid inlet nozzle 51 communicates with the multiple first cooling flow channels 21 through the liquid inlet current collector channel. The liquid inlet current collector channel of the liquid inlet current collector 5 communicates with the multiple first cooling flow channels 21, so as to share the same liquid inlet nozzle 51, which is conducive to simplifying the pipeline structure and reducing the number of nozzles, and the assembly is also more simple, which is conducive to reducing the cost.

[0047] Optionally, the liquid outlet end of the second cooling plate 3 is provided with a liquid outlet current collector 6, and the liquid outlet current collector 6 has a liquid outlet nozzle 61 and a liquid outlet current collector channel 62, and the liquid outlet nozzle 61 communicates with the multiple second cooling flow channels 31 through the liquid outlet current collector channel 62. The liquid outlet current collector channel 62 of the liquid outlet current collector 6 communicates with the multiple second cooling flow channels 31, so as to share the same liquid outlet nozzle 61, which is conducive to simplifying the pipeline structure and reducing the number of nozzles, and the assembly is also more simple, which is conducive to reducing the cost.

[0048] Optionally, the liquid inlet current collector 5 and the liquid outlet current collector 6 are located at the same end of the battery cell group 1, that is, the liquid inlet end and the liquid outlet end of the cooling circuit are located at the same end of the battery cell group 1, which is conducive to centralized arrangement of the medium pipeline, compact layout, and improving the space utilization rate.

[0049] In the present application, the cooling medium enters from two liquid inlet nozzles 51, flows through the liquid inlet current collector channel, the first cooling flow channel 21 and the connecting current collector channel 41 in turn, enters the second cooling flow channel 31, and is discharged from the liquid outlet nozzle 61 through the liquid outlet current collector channel 62. It can be understood that the inlet and outlet directions of the cooling medium are not limited to the above-mentioned directions, and can also flow in the opposite direction, for example, enter from the liquid outlet nozzle 61 and discharge from the liquid inlet nozzle 51. The specific flow principle is the same as that of the forward flow, and will not be repeated here.

[0050] Optionally, the first cooling plate 2 and the second cooling plate 3 are both harmonicas, and the first cooling flow channel 21 and the second cooling flow channel 31 are both straight channels, which are convenient to process and low in cost.

[0051] The first cooling plate 2 and the second cooling plate 3 are connected and matched to cool three sides of the battery cell group 1, which not only has good cooling effect but also uniform cooling, and is conducive to reducing temperature difference; in addition, the first cooling plate 2 is connected with the second cooling plate 3, which is conducive to improving the rigidity of the overall structure, so that the overall structure of the battery cell assembly is more stable and reliable.

[0052] Referring to Figures 9 to 12 In some optional embodiments, the second side of the battery cell group 1 is provided with an explosion-proof valve 7, which can discharge smoke when the battery cell 111 is in thermal runaway, thereby reducing the risk of thermal spread. The explosion-proof valve 7 faces the second cooling plate 3, that is, the second cooling plate 3 is located on the side of the battery cell group 1 provided with the explosion-proof valve 7; wherein the second cooling plate 3 includes a plurality of cooling plate bodies 32 distributed along the length direction of the battery cell 111, and the gap between the explosion-proof valve 7 and the adjacent two cooling plate bodies 32 corresponds.

[0053] Specifically, the top side of the battery cell group 1 is provided with an explosion-proof valve 7, and the plurality of cooling plate bodies 32 of the second cooling plate 3 are arranged on the top side of the battery cell group 1 and avoid the explosion-proof valve 7 to avoid interfering with the normal operation of the explosion-proof valve 7.

[0054] The battery cell assembly of the above embodiment, the second cooling plate 3 is arranged on the side of the battery cell group 1 provided with the explosion-proof valve 7, which has good cooling effect and is conducive to reducing the influence of high-temperature smoke discharged by the explosion-proof valve 7 on the temperature of the battery cell group 1, and is conducive to reducing the risk of thermal spread of the battery cell 111 in thermal runaway, thereby improving the safety performance of the battery cell assembly. In addition, the cooling plate body 32 of the second cooling plate 3 is staggered with the explosion-proof valve 7, and will not interfere with the normal operation of the explosion-proof valve 7.

[0055] Referring to Figures 1 to 3 , Figure 6 and Figure 8 In some optional embodiments, the top side of the battery cell group 1 is provided with an explosion-proof valve 7, and the second cooling plate 3 is arranged on the bottom side of the battery cell group 1, that is, the second cooling plate 3 and the explosion-proof valve 7 are respectively arranged on the opposite bottom side and top side of the battery cell group 1, the second cooling plate 3 and the explosion-proof valve 7 are not on the same side of the battery cell group 1, and the second cooling plate 3 does not need to avoid the explosion-proof valve 7 and can include one or more cooling plate bodies 32. Specifically, referring to Figure 6 , the second cooling plate 3 includes a plurality of cooling plate bodies 32; referring to Figure 8 , the second cooling plate 3 includes one cooling plate body 32.

[0056] Referring to Figures 13 to 20In some optional embodiments, the cell group 1 includes N cell stacks 11, the second cooling plate 3 includes 2N or N+1 cooling plate bodies 32, N is a natural number greater than or equal to 2, and the plurality of cooling plate bodies 32 are distributed along the arrangement direction of the plurality of cell stacks 11.

[0057] Optionally, referring to Figure 16 , the second cooling plate 3 is located on the side of the cell group 1 where the explosion-proof valve 7 is arranged, and each cell stack 11 corresponds to two cooling plate bodies 32, that is, the number of cell stacks 11 is N, the number of cooling plate bodies 32 is 2N, and the explosion-proof valve 7 is located between the gaps between the adjacent two cooling plate bodies 32, which not only ensures the cooling effect, but also avoids interference with the explosion-proof valve 7.

[0058] Optionally, referring to Figure 18 , the second cooling plate 3 is located on the side of the cell group 1 where the explosion-proof valve 7 is arranged, the number of cell stacks 11 is N, the number of cooling plate bodies 32 is N+1, and part of the cooling plate bodies 32 can act on the adjacent two cell stacks 11 at the same time. The explosion-proof valve 7 is located between the gaps between the adjacent two cooling plate bodies 32, which not only ensures the cooling effect, but also avoids interference with the explosion-proof valve 7, and also reduces the number of cooling plate bodies 32.

[0059] Optionally, referring to Figure 19 and Figure 20 , the second cooling plate 3 is located on the side of the cell group 1 opposite to the second side where the explosion-proof valve 7 is arranged, for example, the explosion-proof valve 7 is arranged on the top side of the cell group 1, and the second cooling plate 3 is arranged on the bottom side of the cell group 1. The explosion-proof valve 7 is arranged on the bottom side of the cell group 2, and the second cooling plate 3 is arranged on the top side of the cell group 1. The second cooling plate 3 can include one cooling plate body 32, 2N cooling plate bodies 32, or N+1 cooling plate bodies 32. The number of cooling plate bodies 32 can be set according to requirements, which is flexible and convenient to set, and is conducive to reducing the assembly difficulty.

[0060] Referring to Figures 1 to 20 , in some optional embodiments, the application provides a battery module including the cell assembly according to any one of the above embodiments.

[0061] Referring to Figures 1 to 20 , in some optional embodiments, the application provides a battery pack including the cell assembly according to any one of the above embodiments.

[0062] The first cooling plate 2 and the second cooling plate 3 cooperate to realize three-face cooling of the battery cell group 1, so that the cooling medium can flow in three-dimensional space, the cooling area is large, the cooling effect is good, and moreover, a plurality of cooling circuits are arranged in parallel, the cooling medium in the two first cooling plates 2 all flows to the second cooling plate 3, cooling is uniform, and especially, compared with the traditional one cooling side plate in which cooling medium is input and one cooling side plate from which cooling medium is output, the temperature difference is greatly reduced, and the product performance of the battery cell group, the battery module and the battery pack is improved.

[0063] In the description of the present specification, the description referring to the terms "embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description 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.

[0064] The above-described embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. An electrochemical cell assembly, comprising: include: A battery cell assembly having two parallel and opposite first sides and a second side intersecting the two first sides, the second side being the top or bottom side of the battery cell assembly, the battery cell assembly including at least one battery cell stack, each battery cell stack having a plurality of stacked battery cells; Two first cooling plates are respectively located on two first sides of the cell assembly. The first cooling plates extend along the stacking direction of the plurality of cells in the cell stack body, and the first cooling plates are provided with first cooling channels. The second cooling plate is located on the second side of the cell assembly. The liquid inlet of the second cooling plate is connected to the liquid outlet of the first cooling plate. The second cooling plate is provided with multiple second cooling channels. The multiple second cooling channels correspond to and are connected to the first cooling channels in the two first cooling plates to form multiple parallel cooling circuits.

2. The cell assembly of claim 1, wherein, The liquid outlets of the two first cooling plates and the liquid inlet of the second cooling plate are located at the same end of the cell assembly and are connected by the same connecting current collector. The connecting current collector is provided with a connecting current collector channel that connects the first cooling channel and the second cooling channel.

3. The cell assembly of claim 2, wherein, The cross-section of the connecting current collector has a U-shaped structure.

4. The cell assembly of claim 2, wherein, The first cooling plate has a liquid inlet collector installed at its liquid inlet end. The first cooling plate has multiple first cooling channels. The liquid inlet collector has a liquid inlet nozzle and a liquid inlet collection channel. The liquid inlet nozzle is connected to the multiple first cooling channels through the liquid inlet collection channel.

5. The cell assembly of claim 4, wherein, The liquid outlet end of the second cooling plate is equipped with a liquid outlet collector, which has a liquid outlet nozzle and a liquid outlet collection channel. The liquid outlet nozzle is connected to multiple second cooling channels through the liquid outlet collection channel.

6. The cell assembly of claim 5, wherein, Both the liquid inlet current collector and the liquid outlet current collector are located at the same end of the battery cell assembly.

7. The cell assembly of claim 2, wherein, Both the first cooling plate and the second cooling plate are harmonica tubes.

8. The cell assembly of claim 1, wherein, An explosion-proof valve is provided on the second side of the battery cell assembly. The second cooling plate includes a plurality of spaced cooling plate bodies. The explosion-proof valve faces the second cooling plate and corresponds to the gap between two adjacent cooling plate bodies.

9. The cell assembly of any one of claims 1 to 8, wherein, The battery cell assembly includes N battery cell stacks, and the second cooling plate includes 2N or N+1 cooling plates, where N is a natural number greater than or equal to 2, and the multiple cooling plates are distributed along the arrangement direction of the multiple battery cell stacks.

10. A battery module, characterized by Includes the cell assembly as described in any one of claims 1 to 9.

11. A battery pack, characterized by Includes the cell assembly as described in any one of claims 1 to 9.

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