Battery cell assembly, battery module and battery pack

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery cell assembly, a battery module and a battery pack. The battery cell assembly comprises a plurality of battery cell groups which are stacked into a plurality of layers along the height direction of battery cells in the battery cell groups, and each layer of battery cell group is provided with a plurality of battery cell rows which are arranged side by side; the cooling plate is positioned between two adjacent battery cell rows, is arranged along the stacking direction of the battery cell groups and corresponds to at least two adjacent layers of battery cell groups, and a plurality of cooling channels which are connected in parallel and are distributed along the stacking direction of the battery cell groups are arranged in the cooling plate; and the current collector is connected with the cooling plate and is provided with a shunting structure for shunting the cooling medium, and the shunting structure is communicated with the plurality of cooling channels. The cooling plate is internally provided with a plurality of cooling channels which are distributed in the stacking direction of the battery cell groups, are connected in parallel and are communicated with the shunting structure, so that the layout is compact, the battery cell groups of different layers can be uniformly cooled, the space utilization rate is favorably improved, and the energy density of the battery cell assembly, the battery module and the battery pack is favorably 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. Generally, cooling system is used to adjust the temperature of battery cell, but the cooling channel in traditional cooling system is single, and the cooling effect is poor, especially when cooling multiple layers of battery cell, it is easy to cause the temperature difference between upper and lower layers of battery cell, and if multiple layers of cooling plate are used for layered cooling, it will lead to complex pipeline, which is not conducive to improve space utilization. SUMMARY

[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 problems of poor cooling effect and complex structure of the cooling system in the prior art, to improve the cooling effect and space utilization of the battery cell assembly, the battery module and the battery pack.

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

[0005] A plurality of battery cell groups, a plurality of battery cell groups are stacked along the height direction of battery cell in the battery cell group to form multiple layers, and each layer of battery cell group has a plurality of battery cell rows arranged side by side.

[0006] Cooling plate, the cooling plate is located between two adjacent battery cell rows, the cooling plate is arranged along the stacking direction of the battery cell group and corresponds to at least two adjacent layers of the battery cell group, and the cooling plate is provided with a plurality of cooling channels connected in parallel and distributed along the stacking direction of the battery cell group.

[0007] Current collector, the current collector is connected with the cooling plate, and the current collector is provided with a shunt structure for shunting cooling medium, and the shunt structure is communicated with a plurality of cooling channels.

[0008] Optionally, the cooling plate comprises a plurality of plate bodies, a plurality of plate bodies are distributed along the stacking direction of the battery cell group and correspond to a plurality of battery cell groups one by one, at least one cooling channel is arranged in each plate body, and all cooling channels in the cooling plate are communicated with the shunt structure in the same current collector.

[0009] Optionally, the cooling plate comprises a plate body extending along the stacking direction of the battery cell group, and a plurality of cooling channels are arranged in the plate body, each of the battery cell groups corresponding to at least one of the cooling channels, and all the cooling channels of the cooling plate being in communication with the flow distribution structure in the same current collector.

[0010] Optionally, a plurality of cooling plates are provided, and the plurality of cooling plates are distributed along the side-by-side direction of the plurality of battery cell rows, and the current collector is in communication with the cooling channels in at least two of the cooling plates.

[0011] Optionally, the flow distribution structure comprises a plurality of flow outlet ports and a plurality of flow return ports, the plurality of flow outlet ports being in communication with the inlet ends of the corresponding cooling channels, and the plurality of flow return ports being in communication with the outlet ends of the corresponding cooling channels.

[0012] Optionally, the plurality of flow outlet ports and the plurality of flow return ports in communication with the plurality of cooling channels of the same cooling plate are alternately distributed along the stacking direction of the battery cell group.

[0013] Optionally, the current collector has a first side, a second side, and a third side, the first side and the second side being distributed along the side-by-side direction of the plurality of battery cell rows, the third side facing the battery cell group, and the first side, the second side, and the third side each being provided with a plurality of flow outlet ports and a plurality of flow return ports, the flow outlet ports and the flow return ports on the same side of the current collector being in communication with the cooling channels in the same cooling plate.

[0014] Optionally, the current collector comprises a first part and a second part, the first part and the second part being cooperatively arranged to define the flow distribution structure when connected.

[0015] Optionally, the flow outlet ports and the flow return ports are arranged on the first part, the first part being further provided with a first outlet communication part and a first return communication part, the second part being provided with a second outlet communication part and a second return communication part, the plurality of flow outlet ports being in communication through the outlet collection channel formed by the cooperation of the first outlet communication part and the second outlet communication part, the plurality of flow return ports being in communication through the return collection channel formed by the cooperation of the first return communication part and the second return communication part, and the flow outlet ports, the flow return ports, the first outlet communication part, the first return communication part, the second outlet communication part, and the second return communication part cooperatively defining the flow distribution structure.

[0016] Optionally, the second part is further provided with an inlet interface and an outlet interface, the inlet interface being in communication with the outlet collection channel, and the outlet interface being in communication with the return collection channel.

[0017] Optionally, the battery cell includes a cylindrical battery cell, and the cooling plate includes a serpentine plate.

[0018] To achieve the above and other related objectives, this application also provides a battery module, including the cell assembly described above.

[0019] To achieve the above and other related objectives, this application also provides a battery pack including the cell assembly described above.

[0020] As described above, the battery cell assembly, battery module, and battery pack of this utility model have at least the following beneficial effects: multiple battery cell groups are stacked in a compact layout, which is conducive to improving space utilization. Based on this, the current collector diverts the cooling medium through a diversion structure so that the cooling medium flows into multiple cooling channels in the cooling plate. The multiple cooling channels are distributed and connected in parallel along the stacking direction of the battery cell groups, which helps to simplify the structure and enables uniform cooling of battery cell groups in different layers, resulting in good cooling effect. In addition, the diversion structure of the current collector is connected to multiple cooling channels, which further simplifies the structure, especially reducing the number of joints and pipes, thereby further improving space utilization and thus improving the energy density of the battery cell assembly, battery module, and battery pack. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a first embodiment of the battery cell assembly of this utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the intermediate cooling plate and the collector;

[0023] Figure 3 for Figure 1 Schematic diagram of the structure of the central fluid collector;

[0024] Figure 4 for Figure 3 Front view of the central fluid collector;

[0025] Figure 5 for Figure 4 Sectional view at point AA;

[0026] Figure 6 for Figure 4 Sectional view at point BB;

[0027] Figure 7 for Figure 4 Sectional view at CC;

[0028] Figure 8 for Figure 3 The front view of the first part of the body;

[0029] Figure 9 for Figure 3 a rear view of the first part body;

[0030] Figure 10 for Figure 3 a side view of the first part body;

[0031] Figure 11 for Figure 3 a front view of the second part body;

[0032] Figure 12 for Figure 3 a rear view of the second part body;

[0033] Figure 13 for a structure schematic view of the second embodiment of the battery cell assembly;

[0034] Figure 14 for Figure 13 a structure schematic view of the cooling plate and the current collector.

[0035] Part number explanation

[0036] Battery cell assembly 1, battery cell row 11, cooling plate 2, plate body 21, current collector 3, first part body 31, shunt liquid outlet 311, shunt liquid return port 312, first liquid outlet communication part 313, first liquid return communication part 314, second part body 32, second liquid outlet communication part 321, second liquid return communication part 322, liquid inlet interface 323, liquid outlet interface 324, liquid inlet connector 41, liquid outlet connector 42. DETAILED DESCRIPTION

[0037] The implementation of the present application will be described by specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0038] It should be noted 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 present application, so they do not have 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 present application, should still fall within the scope of the technical content disclosed by the present application. 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 present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0039] ReferenceFigures 1 to 3 、 Figure 12 and Figure 14 In some optional embodiments, the application provides an electric cell assembly, which comprises a plurality of electric cell groups 1, a cooling plate 2 and a current collector 3. The plurality of electric cell groups 1 are stacked in the height direction of the electric cells in the electric cell group 1 to form multiple layers, each layer of the electric cell group 1 has a plurality of electric cell rows 11 arranged side by side, each electric cell row 11 comprises one or more electric cells arranged side by side, and the electric cells comprise cylindrical electric cells. The cooling plate 2 is located between two adjacent electric cell rows 11, so that the same cooling plate 2 can simultaneously cool the adjacent two electric cell rows 11 in the same layer. The cooling plate 2 is arranged in the stacking direction of the electric cell group 1 and corresponds to at least two adjacent layers of the electric cell group 1, and the cooling plate 2 is provided with a plurality of cooling channels arranged in parallel and distributed in the stacking direction of the electric cell group 1, so that the same cooling plate 2 can also simultaneously cool multiple layers of the electric cell group 1, and the layout is compact. The current collector 3 is connected with the cooling plate 2, and the current collector 3 is provided with a shunt structure for shunting the cooling medium, the shunt structure is in communication with the plurality of cooling channels, and the cooling medium enters the current collector 3 and is shunted by the shunt structure and then delivered to the plurality of parallel cooling channels, which is beneficial to the uniform distribution of the cooling medium to ensure the cooling effect and simplify the structure.

[0040] Optionally, the cooling channel has an inlet end and an outlet end, and the inlet end and the outlet end are located at the same end of the cooling plate 2, which is convenient for connection with the same current collector 3 and has a compact layout. The inlet end of the cooling channel is located at the first end of the cooling plate 2, the outlet end of the cooling channel extends to the second end of the cooling plate 2 along the length direction of the cooling plate 2, and then reversely extends to the first end of the cooling plate 2. Further, the cross section of the cooling channel is U-shaped.

[0041] Optionally, the number of the cooling plates 2 is multiple, the multiple cooling plates 2 are distributed in the side-by-side direction of the multiple electric cell rows 11 in the same layer of the electric cell group 1, the current collector 3 is in communication with the cooling channels in at least two cooling plates 2 at the same time, the multiple cooling plates 2 share the same current collector 3, the layout is compact, which is beneficial to simplify the structure and reduce the number of components, especially the number of joints and pipelines, thereby reducing the cost. Further, the same current collector 3 is connected with three adjacent cooling plates 2 at the same time. The cooling plate 2 comprises a serpentine plate. In the application, the arrangement direction of the multiple electric cells of each electric cell row 11 is the same as the length direction of the cooling plate 2, that is, the Y direction in the drawing; the side-by-side direction of the multiple electric cell rows 11 in the same layer of the electric cell group 1 is the same as the arrangement direction of the multiple cooling plates 2, that is, the X direction in the drawing; the stacking direction of the multiple electric cell groups 1, the height direction of the electric cell group 1, the height direction of the electric cell and the height direction of the cooling plate 2 are the same, that is, the Z direction in the drawing.

[0042] The electric cell assembly of the above embodiment, the plurality of electric cell groups 1 are arranged in layers, the layout is compact, and the space utilization is improved while meeting the power demand; the cooling plate 2 is provided with a plurality of cooling channels in parallel and distributed along the stacking direction of the electric cell group 1, so that the plurality of cooling channels can act on the electric cell groups 1 in different layers respectively, the plurality of cooling channels cooperate with the flow distribution structure of the current collector 3 to make the flow paths of the cooling medium after flow distribution consistent, the flow distribution is uniform, the cooling is uniform, which is beneficial to reduce the temperature difference between the upper and lower electric cell groups 1, improve the cooling effect, and the plurality of cooling channels are connected with the same current collector 3, which is beneficial to simplify the structure and further improve the space utilization, thereby being beneficial to the small volume production of the electric cell assembly, and further being beneficial to improve the energy density of the electric cell assembly and reduce the cost.

[0043] Referring to Figure 1 and Figure 2 In some optional embodiments, the cooling plate 2 includes a plurality of plate bodies 21, the plurality of plate bodies 21 are distributed in the stacking direction of the electric cell group 1 and correspond to the plurality of layers of electric cell groups 1 one by one, at least one cooling channel is arranged in each plate body 21, and all the cooling channels in the cooling plate 2 are communicated with the flow distribution structure in the same current collector 3, that is, the plurality of plate bodies 21 of the same cooling plate 2 share the same current collector 3, which is beneficial to simplify the structure.

[0044] Optionally, each cooling plate 2 corresponds to two layers of electric cell groups 1, and each cooling plate includes two plate bodies 21 distributed in the stacking direction of the electric cell group 1, the plate body 21 located at the upper position corresponds to the electric cell group 1 located at the upper layer to cool the electric cell group 1 located at the upper layer, and the plate body 21 located at the lower position corresponds to the electric cell group 1 located at the lower layer to cool the electric cell group 1 located at the lower layer, so that the electric cell groups 1 are cooled in layers and uniformly.

[0045] The electric cell assembly of the above embodiment, the plurality of plate bodies 21 of the same cooling plate 2 are distributed in the stacking direction of the electric cell group 1, so that the plate body 21 only covers the part directly in contact with the electric cell group 1, which is beneficial to save materials, reduce weight and reduce cost.

[0046] Referring to Figure 13 and Figure 14 In some optional embodiments, the cooling plate 2 includes one plate body 21, the plate body 21 extends in the stacking direction of the electric cell group 1, and a plurality of cooling channels are arranged in the plate body 21, and each layer of electric cell group 1 corresponds to at least one cooling channel.

[0047] Optionally, the same plate body 21 corresponds to two layers of electric cell groups 1, and the plate body 21 is provided with two cooling channels distributed in the stacking direction of the electric cell group 1, the cooling channel located at the upper position corresponds to the electric cell group 1 located at the upper layer to cool the electric cell group 1 located at the upper layer, and the cooling channel located at the lower position corresponds to the electric cell group 1 located at the lower layer to cool the electric cell group 1 located at the lower layer, so that the electric cell groups 1 are cooled in layers and uniformly.

[0048] The cell assembly of the above embodiment, the cooling plate 2 acts on at least two layers of cell groups 1 through a plate body 21, the number of plate bodies 21 is reduced, the assembly is simple, and the cooling plate 2 is a whole, the structure is more stable, and the strength and stability of the overall structure of the cell assembly are improved.

[0049] Referring to Figures 1 to 14 In some optional embodiments, the shunt structure of the current collector 3 includes a plurality of shunt liquid outlets 311 and a plurality of shunt liquid return ports 312, the plurality of shunt liquid outlets 311 are respectively communicated with the liquid inlet ends of the corresponding cooling channels, and the plurality of shunt liquid return ports 312 are respectively communicated with the liquid outlet ends of the corresponding cooling channels.

[0050] Optionally, referring to Figure 2 , Figures 7 to 9 The plurality of shunt liquid outlets 311 and the plurality of shunt liquid return ports 312 communicated with the plurality of cooling channels of the same cooling plate 2 are alternately distributed along the stacking direction of the cell group 1, the arrangement direction of the shunt liquid outlets 311 and the shunt liquid return ports 312 corresponds to the arrangement direction of the liquid inlet ends and the liquid outlet ends of the cooling channels, the connection is convenient, and the layout is compact. Among them, the plurality of shunt liquid outlets 311 are communicated with each other through liquid outlet current collection channels, so that the cooling medium entering the current collector 3 is shunted to the plurality of shunt liquid outlets 311, and the plurality of shunt liquid return ports 312 are communicated with each other through liquid return current collection channels, so that the cooling medium flowing out of the cooling plate 2 is collected and discharged after flowing back to the current collector 3.

[0051] Optionally, the current collector 3 has a first side, a second side and a third side, the first side and the second side are distributed along the side-by-side direction of the plurality of cell rows 11 of the same layer of cell groups 1, the third side faces the cell group 1, and the first side, the second side and the third side are all provided with a plurality of shunt liquid outlets 311 and a plurality of shunt liquid return ports 312, the shunt liquid outlets 311 and the shunt liquid return ports 312 on the same side of the current collector 3 are connected with the same cooling plate 2, that is, the shunt liquid outlets 311 and the shunt liquid return ports 312 on the same side of the current collector 3 are communicated with the plurality of cooling channels in the same cooling plate 2. The first side, the second side and the third side of the current collector 3 are respectively connected with three adjacent cooling plates 2, so that the cooling medium is uniformly shunted through the current collector 3 and then respectively delivered into the corresponding cooling plates 2, the layout is compact, and the connection is convenient.

[0052] Optionally, the current collector 3 comprises a first part 31 and a second part 32, and the first part 31 and the second part 32 cooperatively define the flow distribution structure when connected. Further, the first part 31 and the second part 32 are fixed by welding; specifically, the first part 31 and the second part 32 are fixed by brazing, which is firm and has good sealing performance, and the cooling medium is not easy to leak. The first part 31 and the second part 32 are of a split structure, which can be processed separately and then connected and fixed together, thereby facilitating the reduction of processing difficulty, especially the processing difficulty of the flow distribution structure inside the current collector 3.

[0053] Optionally, the flow distribution outlet 311 and the flow distribution return port 312 are arranged on the first part 31, and the first part 31 is further provided with a first outlet communication part 313 and a first return communication part 314, the second part 32 is provided with a second outlet communication part 321 and a second return communication part 322, the plurality of flow distribution outlets 311 are connected in communication through the first outlet communication part 313 and the second outlet communication part 321 cooperatively forming an outlet current collection channel, the plurality of flow distribution return ports 312 are connected in communication through the first return communication part 314 and the second return communication part 322 cooperatively forming a return current collection channel, and the flow distribution outlet 311, the flow distribution return port 312, the first outlet communication part 313, the first return communication part 314, the second outlet communication part 321 and the second return communication part 322 cooperatively define the flow distribution structure.

[0054] Optionally, the second part 32 is further provided with an inlet interface 323 and an outlet interface 324, the inlet interface 323 is in communication with the outlet current collection channel, and the outlet interface 324 is in communication with the return current collection channel. The inlet interface 323 is provided with an inlet connector 41, and the outlet interface 324 is provided with an outlet connector 42. The cooling medium enters the outlet current collection channel from the inlet connector 41, is respectively delivered to each flow distribution outlet 311 through the outlet current collection channel, is output from the flow distribution outlet 311 into the inlet end of the cooling channel, is output from the outlet end and then flows back to the return current collection channel in the current collector 3 from the flow distribution return port 312, and is converged in the return current collection channel and then output through the outlet connector 42.

[0055] The current collector 3 of the battery cell assembly has the flow distribution structure with the plurality of flow distribution outlets 311 and the plurality of flow distribution return ports 312, so that the cooling medium is uniformly distributed to each corresponding cooling channel, which is conducive to the uniform cooling of the different layers of the battery cell group 1 by the branch streams of the plurality of cooling media, and is conducive to the reduction of the temperature difference between the different layers of the battery cell group 1.

[0056] Referring to Figures 1 to 14 In some optional embodiments, the application further provides a battery module comprising the battery cell assembly according to any one of the above embodiments.

[0057] Referring to Figures 1 to 14In some optional embodiments, the application further provides a battery pack comprising the cell assembly according to any one of the above embodiments.

[0058] The cell assembly, the battery module and the battery pack have the advantages that: the plurality of cooling channels are arranged in parallel in the cooling plate 2 and distributed along the stacking direction of the cell group 1, so that the cell group 1 in different layers can be cooled, and the space utilization rate is high; in addition, the shunt structure of the current collector 3 divides and conveys the cooling medium into the plurality of cooling channels, which not only has a compact layout and is conducive to further improving the space utilization rate, but also is conducive to making the flow paths of the cooling medium in the plurality of cooling channels consistent and improving the cooling uniformity, thereby being conducive to improving the space utilization rate and product performance of the cell assembly, the battery module and the battery pack.

[0059] In the description of the present specification, the description referring to the terms "the present embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained 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.

[0060] The above 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 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: The application relates to a battery pack, comprising: a plurality of battery cell groups, the plurality of battery cell groups are arranged in multiple layers along the height direction of the battery cell groups, and each layer of the battery cell groups has a plurality of battery cell rows arranged side by side; a cooling plate, the cooling plate is arranged between two adjacent battery cell rows, the cooling plate is arranged along the stacking direction of the battery cell groups and corresponds to at least two adjacent layers of the battery cell groups, and the cooling plate is provided with a plurality of cooling channels arranged in parallel and distributed along the stacking direction of the battery cell groups; a current collector, the current collector is connected with the cooling plate, and the current collector is provided with a flow distribution structure for distributing cooling medium, and the flow distribution structure is communicated with the plurality of cooling channels.

2. The cell assembly of claim 1, wherein, The cooling plate comprises a plurality of plate bodies, the plurality of plate bodies are distributed in the stacking direction of the battery cell groups and correspond to the plurality of layers of the battery cell groups one by one, each plate body is provided with at least one cooling channel, and all the cooling channels in the cooling plate are communicated with the flow distribution structure in the same current collector.

3. The cell assembly of claim 1, wherein, The cooling plate comprises one plate body, the plate body extends along the stacking direction of the battery cell groups, and a plurality of cooling channels are arranged in the plate body, and each layer of the battery cell groups corresponds to at least one cooling channel.

4. The cell assembly of claim 1, wherein, The number of the cooling plates is plural, the plurality of cooling plates are distributed along the side-by-side direction of the plurality of battery cell rows, and the current collector is communicated with the cooling channels in at least two cooling plates at the same time.

5. The cell assembly of any one of claims 1 to 4, wherein, The flow distribution structure comprises a plurality of flow-out ports and a plurality of flow-back ports, the plurality of flow-out ports are respectively communicated with the inlet ends of the corresponding cooling channels, and the plurality of flow-back ports are respectively communicated with the outlet ends of the corresponding cooling channels.

6. The cell assembly of claim 5, wherein, The plurality of flow-out ports and the plurality of flow-back ports communicated with the plurality of cooling channels in the same cooling plate are alternately distributed along the stacking direction of the battery cell groups.

7. The cell assembly of claim 5, wherein, The current collector has a first side, a second side and a third side, the first side and the second side are distributed along the side-by-side direction of the plurality of battery cell rows, the third side faces the battery cell groups, and the first side, the second side and the third side are all provided with a plurality of flow-out ports and a plurality of flow-back ports, the flow-out ports and the flow-back ports on the same side of the current collector are communicated with the cooling channels in the same cooling plate.

8. The cell assembly of claim 5, wherein, The current collector comprises a first part and a second part, and the first part and the second part cooperatively define the flow distribution structure when connected.

9. The cell assembly of claim 8, wherein, The flow-out ports and the flow-back ports are arranged on the first part, the first part is further provided with a first outlet communication part and a first return communication part, the second part is provided with a second outlet communication part and a second return communication part, the plurality of flow-out ports are communicated through the outlet collection channel formed by the cooperation of the first outlet communication part and the second outlet communication part, the plurality of flow-back ports are communicated through the return collection channel formed by the cooperation of the first return communication part and the second return communication part, and the flow-out ports, the flow-back ports, the first outlet communication part, the first return communication part, the second outlet communication part and the second return communication part cooperatively define the flow distribution structure.

10. The cell assembly of claim 9, wherein, The second part is further provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the liquid outlet collecting channel, and the liquid outlet is communicated with the liquid return collecting channel.

11. The cell assembly of claim 1, wherein, The electric core comprises a cylindrical electric core, and the cooling plate comprises a serpentine plate.

12. A battery module, characterized by The electric core assembly comprises the electric core assembly as claimed in any one of claims 1 to 11.

13. A battery pack, characterized by, The electric core assembly comprises the electric core assembly as claimed in any one of claims 1 to 11.

Images