Shell assembly and battery cell

Abstract

The utility model discloses a shell assembly and a battery monomer, the shell assembly comprises: a shell having a first accommodating space; the inner shell is located in the first accommodating space, the inner peripheral wall of the outer shell and the outer peripheral wall of the inner shell are separated and form an annular cavity, the inner shell is provided with a second accommodating space, and the pole group of the battery monomer is located in the second accommodating space; and the liquid flow pipeline is located in the annular cavity, the liquid flow pipeline surrounds the peripheral wall of the inner shell in the length direction of the shell assembly to form multiple circles, and the liquid flow pipeline is used for containing cooling liquid. According to the shell assembly disclosed by the utility model, the heat exchange liquid in the liquid flow pipeline exchanges heat with the pole group, so that the temperature of the pole group is quickly increased or reduced to meet the heat dissipation or temperature rise requirements of the battery monomers applying the shell assembly, the heat management efficiency of the battery pack is improved, and the temperature of each battery monomer in the battery pack can be independently controlled; uniform temperature in the battery pack is ensured, and the overall performance of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a housing assembly and a battery cell. Background Art

[0002] With the development of the new energy industry, consumers' demands for fast charging (such as 4℃ - 6℃) and use under extremely cold conditions (such as < - 30℃) are becoming more and more obvious. To ensure the normal use of the battery, it is necessary to develop a more efficient thermal management system that can quickly remove the battery heat or raise the battery temperature. In the prior art, the thermal management system usually adds a liquid cooling plate between or at the bottom of the modules. However, the cooling or heating efficiency of this method is relatively low and increasingly fails to meet the customers' needs. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a housing assembly. The housing assembly exchanges heat with the electrode group through the heat exchange liquid in the liquid flow pipeline, so as to quickly increase or decrease the temperature of the electrode group to meet the heat dissipation or heating requirements of the battery cell applying the housing assembly.

[0004] The utility model also provides a battery cell, which includes the above-mentioned housing assembly.

[0005] The housing assembly according to the embodiment of the utility model for a battery cell includes: an outer shell having a first accommodation space; an inner shell located in the first accommodation space, with a circumferential wall of the outer shell and an outer circumferential wall of the inner shell spaced apart to form an annular cavity. The inner shell has a second accommodation space, and the electrode group of the battery cell is located in the second accommodation space; a liquid flow pipeline located in the annular cavity, and the liquid flow pipeline winds around the outer circumferential wall of the inner shell along the length direction of the housing assembly to form multiple turns, and the liquid flow pipeline is used to accommodate a coolant.

[0006] For the housing assembly according to the embodiment of the utility model, the outer shell has a first accommodation space, the inner shell is located in the first accommodation space, the circumferential wall of the outer shell and the outer circumferential wall of the inner shell are spaced apart to form an annular cavity, the inner shell has a second accommodation space, and the electrode group of the battery cell is located in the second accommodation space. The liquid flow pipeline is located in the annular cavity and winds around the outer circumferential wall of the inner shell along the length direction of the housing assembly to form multiple turns. The liquid flow pipeline is used to accommodate the heat exchange liquid. Thus, the heat exchange liquid in the liquid flow pipeline exchanges heat with the electrode group, so as to quickly increase or decrease the temperature of the electrode group to meet the heat dissipation or heating requirements of the battery cell applying the housing assembly, improve the thermal management efficiency of the battery pack, and can independently control the temperature of each battery cell in the battery pack, ensure the uniform temperature in the battery pack, and improve the overall performance of the battery pack.

[0007] In some embodiments of the present utility model, the liquid flow pipeline includes a first pipeline extending along the circumferential direction of the housing assembly and a second pipeline extending along the length direction of the housing assembly. There are multiple first pipelines which are spaced apart along the length direction of the housing assembly, and any two adjacent first pipelines are communicated through the second pipeline.

[0008] In some embodiments of the present utility model, the multiple first pipelines are parallel.

[0009] In some embodiments of the present utility model, a liquid inlet pipe and a liquid outlet pipe are provided on the outer shell, and both the liquid inlet pipe and the liquid outlet pipe are respectively communicated with the liquid flow pipeline.

[0010] In some embodiments of the present utility model, it further includes: a cover plate, the cover plate is connected to the inner shell, and there is an insulating member between the inner shell and the outer shell.

[0011] In some embodiments of the present utility model, the liquid density of the coolant is ρ1, the material density of the inner shell is ρ2, the material density of the outer shell is ρ3, and it satisfies: ρ1 ≤ ρ2, ρ1 ≤ ρ3.

[0012] In some embodiments of the present utility model, the dimension of the housing assembly along the length direction of the housing assembly is H, the dimension of the housing assembly along the width direction of the housing assembly is W, the dimension of the housing assembly along the thickness direction of the housing assembly is T, the dimension of the inner shell along the thickness direction of the housing assembly is d1, the dimension of the liquid flow pipeline along the thickness direction of the housing assembly is d2, the dimension of the outer shell along the thickness direction of the housing assembly is d3, and it satisfies: d1 + d2 + d3 < W; and / or, d1 + d2 + d3 < H; and / or, d1 + d2 + d3 < T.

[0013] In some embodiments of the present utility model, 50 mm ≤ H ≤ 1200 mm, 50 mm ≤ W ≤ 200 mm, 5 mm ≤ T ≤ 500 mm, 0.1 mm ≤ d1 ≤ 5 mm, 0.1 mm ≤ d2 ≤ 5 mm, 0.1 mm ≤ d3 ≤ 5 mm.

[0014] In some embodiments of the present utility model, the material density of the inner shell is ρ2, the material density of the outer shell is ρ3, the material density of the liquid flow pipeline is ρ4, and it satisfies: 1 g / cm 3 ≤ ρ2 ≤ 10 g / cm 3 ,1 g / cm 3 ≤ ρ3 ≤ 10 g / cm 3 ,ρ4 ≤ ρ2 ≤ ρ3.

[0015] The battery cell according to the embodiment of the present utility model includes the above-mentioned housing assembly.

[0016] According to the battery cell of the embodiment of the present invention, a housing assembly is provided. The outer housing has a first accommodation space, and the inner housing is located within the first accommodation space. The inner peripheral wall of the outer housing and the outer peripheral wall of the inner housing are spaced apart to form an annular cavity. The inner housing has a second accommodation space, and the electrode assembly of the battery cell is located within the second accommodation space. A liquid flow pipeline is located within the annular cavity and winds around the outer peripheral wall of the inner housing for multiple turns along the length direction of the housing assembly. The liquid flow pipeline is used to accommodate a heat exchange liquid, so as to exchange heat between the heat exchange liquid within the liquid flow pipeline and the electrode assembly, thereby quickly increasing or decreasing the temperature of the electrode assembly to meet the heat dissipation or heating requirements of the battery cell using this housing assembly, improving the thermal management efficiency of the battery pack, and enabling independent control of the temperature of each battery cell within the battery pack, ensuring uniform temperature within the battery pack and improving the overall performance of the battery pack.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Brief Description of the Drawings

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0019] Figure 1 is a perspective view of the housing assembly according to the embodiment of the present invention;

[0020] Figure 2 is a cross-sectional view of the housing assembly according to the embodiment of the present invention;

[0021] Figure 3 is Figure 2 an enlarged view of part A in

[0022] Figure 4 a cross-sectional view of the housing assembly according to the embodiment of the present invention from another perspective;

[0023] Figure 5 a cross-sectional view of the housing assembly according to the embodiment of the present invention from yet another perspective;

[0024] Figure 6 a cross-sectional view of the housing assembly according to the embodiment of the present invention from still another perspective;

[0025] Figure 7 is a cross-sectional view of the housing assembly according to another embodiment of the present invention;

[0026] Figure 8 is a cross-sectional view of the housing assembly according to another embodiment of the present invention from another perspective;

[0027] Figure 9is another perspective cross-sectional view of the housing assembly according to another embodiment of the present utility model;

[0028] Figure 10 is yet another perspective cross-sectional view of the housing assembly according to another embodiment of the present utility model.

[0029] Reference numerals:

[0030] 100, housing assembly;

[0031] 1, outer shell; 11, first accommodation space; 12, liquid inlet pipe; 13, liquid outlet pipe;

[0032] 2, inner shell; 21, second accommodation space;

[0033] 3, liquid flow pipeline; 31, first pipeline; 32, second pipeline. Detailed implementation manners

[0034] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0035] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0036] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] The housing assembly 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0038] As Figures 1 - 10 shown, the housing assembly 100 according to an embodiment of the present invention is for a battery cell. The housing assembly 100 includes an outer shell 1, an inner shell 2, and a liquid flow pipeline 3.

[0039] Among them, the outer shell 1 has a first accommodation space 11. The inner shell 2 is located within the first accommodation space 11. The inner peripheral wall of the outer shell 1 and the outer peripheral wall of the inner shell 2 are spaced apart and form an annular cavity. The inner shell 2 has a second accommodation space 21. The electrode group of the battery cell is located within the second accommodation space 21. The liquid flow pipeline 3 is located within the annular cavity. The liquid flow pipeline 3 winds around the outer peripheral wall of the inner shell 2 along the length direction of the housing assembly 100 (such as Figure 1 the first direction shown) to form multiple turns. The liquid flow pipeline 3 is used to accommodate the heat exchange liquid.

[0040] It can be understood that the heat exchange liquid entering the liquid flow pipeline 3 exchanges heat with the electrode group located within the second accommodation space 21 through the inner shell 2, thereby increasing or decreasing the temperature of the electrode group, meeting the heat dissipation or heating requirements of the battery cell, and improving the thermal management efficiency of the battery pack. At the same time, by having the inner peripheral wall of the outer shell 1 and the outer peripheral wall of the inner shell 2 spaced apart to form an annular cavity and the liquid flow pipeline 3 being located within the annular cavity, the outer shell 1 effectively protects the liquid flow pipeline 3, reducing the risk of the liquid flow pipeline 3 being squeezed or impacted and ensuring the heat dissipation effect. In addition, the double-shell arrangement of the inner shell 2 and the outer shell 1 can reduce the risk of liquid leakage and improve the safety of the battery cell.

[0041] Compared with the traditional thermal management system that only arranges heat dissipation channels on the peripheral surface or bottom surface of the battery cell, the housing assembly 100 of the present application forms multiple turns around the outer peripheral wall of the inner shell 2 along the length direction of the housing assembly 100 through the liquid flow pipeline 3, thereby increasing the heat dissipation area, ensuring the uniformity of heat dissipation, and further improving the heat dissipation capacity, and can more quickly take away the heat of the battery cell or heat up the battery cell. At the same time, for a battery pack composed of battery cells applying the housing assembly 100 of the present application, the temperature of each battery cell can be independently controlled, ensuring the uniformity of the temperature within the battery pack and improving the overall performance of the battery pack. In addition, in some embodiments, for a battery pack composed of each battery cell applying the housing assembly 100 of the present application, the liquid cooling plate arranged at the bottom or side can be omitted, reducing the volume and weight of the battery pack and improving the energy density of the battery pack.

[0042] As Figures 1 - 10 shown, the housing assembly 100 can be applied to square batteries or cylindrical batteries.

[0043] According to the housing assembly 100 of the embodiments of the present utility model, the outer housing 1 has a first accommodation space 11, the inner housing 2 is located within the first accommodation space 11, the inner peripheral wall of the outer housing 1 and the outer peripheral wall of the inner housing 2 are spaced apart and form an annular cavity, the inner housing 2 has a second accommodation space 21, the pole group of the battery cell is located within the second accommodation space 21, the liquid flow pipeline 3 is located within the annular cavity, the liquid flow pipeline 3 winds around the outer peripheral wall of the inner housing 2 along the length direction of the housing assembly 100 for multiple turns, the liquid flow pipeline 3 is used to accommodate the heat exchange liquid, so as to exchange heat between the heat exchange liquid within the liquid flow pipeline 3 and the pole group, thereby quickly increasing or decreasing the temperature of the pole group to meet the heat dissipation or temperature increase requirements of the battery cell applying the housing assembly 100, improving the thermal management efficiency of the battery pack, and being able to independently control the temperature of each battery cell within the battery pack, ensuring the temperature within the battery pack is uniform, and improving the overall performance of the battery pack.

[0044] In some embodiments of the present utility model, as Figures 4 - 6 and Figures 8 - 10 shown, the liquid flow pipeline 3 includes a first pipeline 31 extending along the circumferential direction of the housing assembly 100 and a second pipeline 32 extending along the length direction of the housing assembly 100, there are multiple first pipelines 31 and they are spaced apart along the length direction of the housing assembly 100, and any two adjacent first pipelines 31 are connected by the second pipeline 32. Thus, the liquid flow pipeline 3 winds around the outer peripheral wall of the inner housing 2 along the length direction of the housing assembly 100 and forms multiple first pipelines 31 spaced apart along the length direction of the housing assembly 100, and the connection of any adjacent multiple second pipelines 32 is achieved through the second pipeline 32, enabling the heat exchange liquid to flow through multiple first pipelines 31 and second pipelines 32 in sequence, effectively increasing the heat dissipation area and ensuring heat dissipation uniformity.

[0045] In some embodiments of the present utility model, as Figure 4 , Figure 6 , Figure 8 and Figure 10 shown, multiple first pipelines 31 are parallel. Thus, through such a setting, the space within the housing assembly 100 can be utilized maximally, while ensuring that the coolant can flow smoothly through each first pipeline 31, reducing the occurrence of unnecessary pressure loss or uneven flow rate, and having a simple structure, being easy to manufacture and assemble, which helps to reduce production costs and improve production efficiency.

[0046] In some embodiments of the present utility model, as Figures 4 - 6 and Figures 8 - 10As shown, a liquid inlet pipe 12 and a liquid outlet pipe 13 are provided on the outer shell 1, and both the liquid inlet pipe 12 and the liquid outlet pipe 13 are respectively communicated with the liquid flow pipeline 3. It can be understood that when cooling is required, the cooled heat exchange liquid enters the liquid flow pipeline 3 through the liquid inlet pipe 12, exchanges heat with the electrode group, and then is discharged from the liquid outlet pipe 13. The cooled heat exchange liquid then enters the liquid flow pipeline 3 again through the liquid inlet pipe 12, exchanges heat with the electrode group, and is discharged from the liquid outlet pipe 13, thereby realizing the circulation of the heat exchange liquid and ensuring the temperature of the battery cell.

[0047] In some embodiments, such as Figures 4 - 6 and Figures 8 - 10 As shown, the liquid flow pipeline 3 includes a first pipeline 31 extending along the circumferential direction of the housing assembly 100 and a second pipeline 32 extending along the length direction of the housing assembly 100. There are multiple first pipelines 31 and they are spaced apart along the length direction of the housing assembly 100. Any two adjacent first pipelines 31 are communicated through the second pipeline 32. The first pipelines 31 at both ends of the housing assembly 100 in the length direction are respectively communicated with the liquid inlet pipe 12 and the liquid outlet pipe 13. Thus, the heat exchange liquid enters the first pipeline 31 communicated with it through the liquid inlet pipe 12, then flows into the first pipeline 31 of the next layer through the second pipeline 32 until it flows to the first pipeline 31 communicated with the liquid outlet pipe 13 and is discharged through the liquid outlet pipe 13.

[0048] In some embodiments of the present invention, the housing assembly 100 further includes a cover plate (not shown in the figure). Among them, the cover plate is connected to the inner shell 2, and there is an insulating member between the inner shell 2 and the outer shell 1. Thus, through such a setting, the sealing performance of the housing assembly 100 is ensured, and the overall reliability is improved. At the same time, since there is an insulating member between the inner shell 2 and the outer shell 1, the conduction path between the outer shell 1 and the inner shell 2 is effectively blocked. The outer shell 1 does not have the three essential conditions for corrosion (electronic conduction, ionic conduction, corrosion potential), improving the corrosion and liquid leakage resistance of the outer shell 1, thereby reducing the risk of arc ignition, and further improving the overall safety performance of the housing assembly 100.

[0049] In some embodiments of the present invention, the liquid density of the heat exchange liquid is ρ1, the material density of the inner shell 2 is ρ2, and the material density of the outer shell 1 is ρ3, and it satisfies: ρ1 ≤ ρ2, ρ1 ≤ ρ3.

[0050] It can be understood that the mass m of the housing assembly 100 = ρv. The volume v of the housing assembly 100 is related to its thickness and shape. When the thickness and shape of the housing assembly 100 are the same, the volume v can be regarded as the same. By restricting the liquid density of the heat exchange liquid, the mass of the housing assembly 100 can be effectively reduced, thereby improving the energy density of the electrode group of the battery cell applying the housing assembly 100.

[0051] In some embodiments of the present invention, such as Figures 1 - 3As shown, the dimension of the housing assembly 100 in the length direction of the housing assembly 100 is H, the dimension of the housing assembly 100 in the width direction of the housing assembly 100 (such as the second direction shown in Figure 1 is W, the dimension of the housing assembly 100 in the thickness direction of the housing assembly 100 (such as the third direction shown in Figure 1 is T, the dimension of the inner shell 2 in the thickness direction of the housing assembly 100 is d1, the dimension of the liquid flow pipeline 3 in the thickness direction of the housing assembly 100 is d2, and the dimension of the outer shell 1 in the thickness direction of the housing assembly 100 is d3, and it satisfies: d1 + d2 + d3 < W; and / or, d1 + d2 + d3 < H; and / or, d1 + d2 + d3 < T.

[0052] Thus, by d1 + d2 + d3 < W, it is limited that the total thickness of the inner shell 2, the liquid flow pipeline 3 and the outer shell 1 during combination will not exceed the dimension of the housing assembly 100 in the width direction of the housing assembly 100. By d1 + d2 + d3 < H, it is limited that the total thickness of the inner shell 2, the liquid flow pipeline 3 and the outer shell 1 during combination will not exceed the dimension of the housing assembly 100 in the length direction of the housing assembly 100. By d1 + d2 + d3 < T, it is limited that the total thickness of the inner shell 2, the liquid flow pipeline 3 and the outer shell 1 during combination will not exceed the dimension of the housing assembly 100 in the thickness direction of the housing assembly 100, ensuring that the components of the battery cell applying the housing assembly 100 can be assembled together as expected without interference or overlap. At the same time, by restricting the dimensions of the outer shell 1, the inner shell 2 and the liquid flow pipeline 3 in the thickness direction of the housing assembly 100, the spatial layout of the housing assembly 100 is rationalized, and the space utilization rate is improved.

[0053] In some embodiments of the present invention, as shown in Figure 1 , 50 mm ≤ H ≤ 1200 mm, 50 mm ≤ W ≤ 200 mm, 5 mm ≤ T ≤ 500 mm, 0.1 mm ≤ d1 ≤ 5 mm, 0.1 mm ≤ d2 ≤ 5 mm, 0.1 mm ≤ d3 ≤ 5 mm.

[0054] It can be understood that by 50 mm ≤ H ≤ 1200 mm, 50 mm ≤ W ≤ 200 mm, 5 mm ≤ T ≤ 500 mm, the height, length and width of the housing assembly 100 can be adjusted according to different application scenarios, improving the universality of the housing assembly 100. At the same time, by 0.1 mm ≤ d1 ≤ 5 mm, 0.1 mm ≤ d2 ≤ 5 mm, 0.1 mm ≤ d3 ≤ 5 mm, the outer shell 1, the inner shell 2 and the liquid flow pipeline 3 have sufficient strength while reducing the space they occupy in the housing assembly 100, so that more space of the housing assembly 100 can be used for storing energy or realizing other functions.

[0055] In some embodiments of the present utility model, the material density of the inner shell 2 is ρ2, the material density of the outer shell 1 is ρ3, and the material density of the liquid flow pipeline 3 is ρ4, and it satisfies: 1 g / cm 3 ≤ρ2≤10 g / cm 3 ,1 g / cm 3 ≤ρ3≤10 g / cm 3 ,ρ4≤ρ2≤ρ3. Thus, by 1 g / cm 3 ≤ρ2≤10 g / cm 3 and 1 g / cm 3 ≤ρ3≤10 g / cm 3 it is defined that the inner shell 2 and the outer shell 1 meet the requirements of strength, stability and light weight, so that the inner shell 2 and the outer shell 1 can select different materials according to the scenarios where the housing assembly 100 is applied, improving the versatility. At the same time, since the liquid flow pipeline 3 is located in front of the inner shell 2 and the outer shell 1 and bears less impact force and pressure than the inner shell 2 and the outer shell 1, therefore, by ρ4≤ρ2≤ρ3, the selection of the material of the liquid flow pipeline 3 is defined, and the weight of the liquid flow pipeline 3 is effectively reduced, reducing the weight of the housing assembly 100. In addition, the outer shell 1 receives a large external impact force, so the strength of the housing assembly 100 can be further ensured by ρ2≤ρ3.

[0056] The battery cell of the embodiment of the present utility model will be described below.

[0057] The battery cell according to the embodiment of the present utility model includes a housing assembly 100.

[0058] The battery cell according to the embodiment of the present utility model is provided with a housing assembly 100. The outer shell 1 has a first accommodation space 11. The inner shell 2 is located in the first accommodation space 11. The inner peripheral wall of the outer shell 1 and the outer peripheral wall of the inner shell 2 are spaced apart and form an annular cavity. The inner shell 2 has a second accommodation space 21. The electrode group of the battery cell is located in the second accommodation space 21. The liquid flow pipeline 3 is located in the annular cavity. The liquid flow pipeline 3 winds around the outer peripheral wall of the inner shell 2 along the length direction of the housing assembly 100 to form multiple turns. The liquid flow pipeline 3 is used to accommodate the heat exchange liquid, so that the heat exchange liquid in the liquid flow pipeline 3 exchanges heat with the electrode group, thereby quickly increasing or decreasing the temperature of the electrode group to meet the heat dissipation or heating requirements of the battery cell applying the housing assembly 100, improving the thermal management efficiency of the battery pack, and can independently control the temperature of each battery cell in the battery pack, ensuring the temperature uniformity in the battery pack and improving the overall performance of the battery pack.

[0059] The housing assembly 100 and the battery cell according to the embodiment of the present utility model are known to those of ordinary skill in the art and will not be described in detail here.

[0060] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean 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 utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0061] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A housing assembly for a battery cell, characterized in that: Comprising: A housing having a first accommodation space; An inner housing located within the first accommodation space, with a circumferential wall of the outer housing and an outer circumferential wall of the inner housing spaced apart to form an annular cavity. The inner housing has a second accommodation space, and the pole group of the battery cell is located within the second accommodation space; A liquid flow pipeline located within the annular cavity. The liquid flow pipeline winds around the outer circumferential wall of the inner housing in multiple turns along the length direction of the housing assembly and is used to accommodate a coolant.

2. The housing assembly according to claim 1, characterized in that: The liquid flow pipeline includes a first pipeline extending in the circumferential direction of the housing assembly and a second pipeline extending in the length direction of the housing assembly. There are multiple first pipelines spaced apart along the length direction of the housing assembly, and any two adjacent first pipelines are connected by the second pipeline.

3. The housing assembly according to claim 2, characterized in that: The multiple first pipelines are parallel.

4. The housing assembly according to claim 1, characterized in that: An inlet pipe and an outlet pipe are provided on the outer housing, and both the inlet pipe and the outlet pipe are respectively connected to the liquid flow pipeline.

5. The housing assembly according to claim 1, characterized in that: Further comprising: A cover plate connected to the inner housing, with an insulating member between the inner housing and the outer housing.

6. The housing assembly according to claim 1, characterized in that: The liquid density of the coolant is ρ1, the material density of the inner housing is ρ2, and the material density of the outer housing is ρ3, and the following is satisfied: ρ1 ≤ ρ2, ρ1 ≤ ρ3.

7. The housing assembly according to claim 1, characterized in that: The dimension of the housing assembly along the length direction of the housing assembly is H, the dimension of the housing assembly along the width direction of the housing assembly is W, the dimension of the housing assembly along the thickness direction of the housing assembly is T, the dimension of the inner housing along the thickness direction of the housing assembly is d1, the dimension of the liquid flow pipeline along the thickness direction of the housing assembly is d2, and the dimension of the outer housing along the thickness direction of the housing assembly is d3, and the following is satisfied: d1 + d2 + d3 < W; and / or, d1 + d2 + d3 < H; and / or, d1 + d2 + d3 < T.

8. The housing assembly according to claim 7, characterized in that: 50 mm ≤ H ≤ 1200 mm, 50 mm ≤ W ≤ 200 mm, 5 mm ≤ T ≤ 500 mm, 0.1 mm ≤ d1 ≤ 5 mm, 0.1 mm ≤ d2 ≤ 5 mm, 0.1 mm ≤ d3 ≤ 5 mm.

9. The housing assembly according to claim 1, characterized in that: The material density of the inner shell is ρ2, the material density of the outer shell is ρ3, and the material density of the liquid flow pipeline is ρ4, and they meet the following conditions: 1 g / cm 3 ≤ρ2≤10g / cm 3 , 1g / cm 3 ≤ρ3≤10g / cm 3 , ρ4≤ρ2≤ρ3.

10. A battery cell, characterized in that: Comprising the housing assembly according to any one of claims 1 - 9.

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