Battery module, battery pack and vehicle

Abstract

The utility model discloses a battery module, a battery pack and a vehicle, the battery module comprises: a battery cell group, the battery cell group comprises a plurality of battery cells, the plurality of battery cells are laminated along the thickness direction of the battery cells; the end plate assembly is arranged at the end part of the battery cell group, the end plate assembly comprises an end plate and a flow isolation piece, the end plate is provided with a lightening hole, the lightening hole penetrates through the end plate along the height direction of the end plate, and the flow isolation piece is connected to the end plate and at least blocks the part of the lightening hole. According to the battery module disclosed by the embodiment of the utility model, the heat exchange amount between the end plate and air can be reduced, the temperature drop rate of the battery cell can be reduced, the electric energy loss of the battery module can be prevented from being too large, and the charge and discharge performance of the battery module can be improved.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a battery module, a battery pack, and a vehicle. Background Technology

[0002] Battery modules in related technologies typically include cell packs, which consist of multiple stacked cells. Since the heat exchange between the ends of the battery module and the air is relatively large, the cells near the edge of the battery module cool down faster in low-temperature environments. That is, the edge temperature of the battery module drops faster, which can easily lead to increased power loss of the battery module. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a battery module that can reduce the heat exchange between the end plate and the air, thereby reducing the rate of temperature drop of the battery cells, thus avoiding excessive energy loss in the battery module, and improving the charging and discharging performance of the battery module.

[0004] This utility model proposes a battery pack having the above-mentioned battery module.

[0005] This utility model also proposes a vehicle having the above-mentioned battery pack.

[0006] To achieve the above objectives, a battery module is provided according to a first aspect of the present invention, comprising: a cell assembly, the cell assembly including a plurality of cells, the plurality of cells being stacked along the thickness direction of the cells; and an end plate assembly disposed at the end of the cell assembly, the end plate assembly including an end plate and a current-blocking member, the end plate having a weight-reducing hole penetrating the end plate, and the current-blocking member being connected to the end plate and at least blocking a portion of the weight-reducing hole.

[0007] The battery module according to the present invention can reduce the heat exchange between the end plate and the air, which is beneficial to reduce the temperature drop rate of the battery cell, thereby avoiding excessive power loss of the battery module and improving the charging and discharging performance of the battery module.

[0008] According to some embodiments of the present invention, there are multiple weight-reducing holes, and the flow-blocking member blocks at least a portion of the multiple weight-reducing holes.

[0009] According to some embodiments of the present invention, the flow-blocking element completely blocks the multiple weight-reducing holes.

[0010] According to some embodiments of the present invention, there are multiple flow-blocking elements, and the multiple flow-blocking elements include a first flow-blocking element and a second flow-blocking element. The first flow-blocking element is blocked at one end of the weight-reducing hole, and the second flow-blocking element is blocked at the other end of the weight-reducing hole. The first flow-blocking element, the second flow-blocking element, and the weight-reducing hole define a sealed chamber.

[0011] According to some embodiments of this utility model, the flow-blocking element is one and blocks the weight-reducing hole.

[0012] According to some embodiments of the present invention, the flow-blocking component includes at least one sub-flow-blocking component, and each sub-flow-blocking component blocks multiple weight-reduction holes; or, the flow-blocking component includes multiple sub-flow-blocking components, and each of the multiple sub-flow-blocking components blocks multiple weight-reduction holes in a one-to-one correspondence.

[0013] According to some embodiments of the present invention, the battery module further includes: a heat insulation component, which is disposed on at least one side of the end plate in the thickness direction to insulate the battery cell assembly.

[0014] According to some embodiments of the present invention, there are multiple end plate assemblies, and the multiple end plate assemblies include a first end plate assembly and a second end plate assembly, wherein the first end plate assembly and the second end plate assembly are respectively disposed on opposite sides of the battery cell assembly.

[0015] A battery pack is provided according to a second aspect of the present invention. The battery pack includes a housing and a battery module according to a first aspect of the present invention, wherein the battery module is disposed within the housing.

[0016] According to the second aspect of the present invention, by utilizing the battery module described in the first aspect of the present invention, the battery module can reduce the heat exchange between the end plate and the air, which is beneficial to reduce the temperature drop rate of the battery cell, thereby avoiding excessive power loss of the battery module and improving the charging and discharging performance of the battery module.

[0017] A vehicle is provided according to a third aspect of the present invention, the vehicle including a battery pack according to a second aspect of the present invention.

[0018] According to the third aspect embodiment of the present invention, by utilizing the battery pack described in the second aspect embodiment of the present invention, the battery module can reduce the heat exchange between the end plate and the air, which is beneficial to reduce the temperature drop rate of the battery cell, thereby avoiding excessive power loss of the battery module and improving the charging and discharging performance of the battery module.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the battery module according to an embodiment of the present utility model;

[0022] Figure 2 This is an exploded view of a battery module according to an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the structure of a battery module without a current-blocking component according to an embodiment of the present utility model.

[0024] Figure label:

[0025] 1. Battery module;

[0026] 100. Battery cell assembly; 110. Battery cell;

[0027] 200, End plate assembly; 210, First end plate assembly; 220, Second end plate assembly; 230, End plate; 231, Weight reduction hole; 240, Flow divider; 241, First flow divider; 242, Second flow divider;

[0028] 300. Side panel. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0032] In the description of this utility model, "multiple" means two or more, and "several" means one or more.

[0033] The battery module 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0034] like Figures 1-3 As shown, the battery module 1 according to an embodiment of the present invention includes a cell assembly 100 and an end plate assembly 200.

[0035] The battery cell assembly 100 includes a plurality of battery cells 110, which are stacked along the thickness direction of the battery cells 110. An end plate assembly 200 is disposed at the end of the battery cell assembly 100, and the end plate assembly 200 includes an end plate 230 and a current-blocking member 240. The end plate 230 is provided with a weight-reducing hole 231, which penetrates the end plate 230. The current-blocking member 240 is connected to the end plate 230 and at least blocks a portion of the weight-reducing hole 231.

[0036] The battery module 1 may further include a side plate 300, which can be connected end-to-end with the end plate assembly 200 to form a frame for mounting the cell assembly 100. For example, the end plate assembly 200 can be located on opposite sides of the cell assembly 100 along its length, with one side of the end plate 230 in its thickness direction attached to the outermost cell 110. The side plate 300 can be located on opposite sides of the cell assembly 100 along its width. In this way, the end plate assembly 200 and the side plate 300 can surround the cell assembly 100 circumferentially, thereby protecting the cell assembly 100 with the frame formed by the end plate assembly 200 and the side plate 300 and preventing positional interference between the multiple cells 110 of the cell assembly 100 and other components. In addition, the cell module 1 in this embodiment of the present invention can be cooled by providing a cold plate on the upper or lower side of the cell assembly 100.

[0037] The end plate 230 and the flow divider 240 can be connected and fixed by means of bonding, screwing or welding.

[0038] In addition, the flow-blocking member 240 at least blocks a portion of the weight reduction hole 231, meaning that the flow-blocking member 240 can completely block the weight reduction hole 231, thereby completely cutting off the airflow within the weight reduction hole 231 and significantly reducing the heat exchange between the end plate 230 and the air; or, the flow-blocking member 240 can only block a portion of the weight reduction hole 231, in which case the flow-blocking member 240 can also reduce the airflow through the weight reduction hole 231, thereby reducing the heat exchange between the end plate 230 and the air.

[0039] It should be noted that the part of the flow-blocking component 240 that blocks the weight reduction hole 231 means that the flow-blocking component 240 can cover a portion of a single weight reduction hole 231, while another portion of the weight reduction hole 231 remains open; or, when there are multiple weight reduction holes 231, the flow-blocking component 240 can cover a portion of the multiple weight reduction holes 231, while another portion of the weight reduction holes 231 remains open.

[0040] According to the embodiment of the present utility model, the battery module 1 has weight reduction holes 231 on the end plate 230. The weight reduction holes 231 penetrate the end plate 230. For example, the weight reduction holes 231 can penetrate the end plate 230 along the height direction of the end plate 230. There can be multiple weight reduction holes 231. In this way, the weight of the end plate 230 can be greatly reduced by using the weight reduction holes 231. This not only reduces the cost, but also reduces the weight of the battery module 1, making it easier to assemble.

[0041] In addition, by setting the flow-blocking component 240, the flow-blocking component 240 can at least block part of the weight reduction hole 231, thereby reducing the airflow through the weight reduction hole 231. This can significantly reduce the heat exchange between the end plate 230 and the air through the inner wall of the weight reduction hole 231, thereby reducing the heat released by the cell 110 to the outside through the end plate 230. The heat exchange between the cell 110 and the air through the end plate 230 can be smaller. When the ambient temperature is low, the temperature drop rate of the cell 100 can be reduced, avoiding the battery module 1 from getting too low in low temperature environments. This can prevent the battery module 1 from losing too much power, thus ensuring that the charging and discharging performance of the battery module 1 is good.

[0042] Thus, the battery module 1 according to the present utility model embodiment can reduce the heat exchange between the end plate 230 and the air, which is beneficial to reduce the temperature drop rate of the cell 110, thereby avoiding excessive power loss of the battery module 1 and improving the charging and discharging performance of the battery module 1.

[0043] In some specific embodiments of this utility model, such as Figure 1 As shown, there are multiple weight reduction holes 231, and the flow-blocking element 240 blocks at least a portion of the multiple weight reduction holes 231.

[0044] In other words, the flow divider 240 can block only some of the multiple weight reduction holes 231, while leaving the other part of the weight reduction holes 231 open; or, the flow divider 240 can block all of the multiple weight reduction holes 231.

[0045] Additionally, it should be noted that when there are multiple weight reduction holes 231, if it is necessary to completely block the weight reduction holes 231, the flow divider 240 needs to completely cover all the weight reduction holes 231 at the same time; if it is only necessary to cover part of the multiple weight reduction holes 231, the flow divider 240 can be used to cover part of the multiple weight reduction holes 231, while the other part of the weight reduction holes 231 remains open, or the flow divider 240 can be used to partially block a single weight reduction hole 231.

[0046] By setting multiple weight-reducing holes 231, multiple ribs can be formed inside the end plate 230 to separate adjacent weight-reducing holes 231. This not only reduces the weight of the end plate 230 by using the weight-reducing holes 231, but also increases the structural strength of the end plate 230 by using multiple ribs. The end plate 230 is not easily deformed by compression, thereby improving the protective effect of the end plate 230 on the battery pack 100.

[0047] In some specific embodiments of this utility model, such as Figure 1 As shown, the flow divider 240 completely blocks the multiple weight reduction holes 231. That is, each of the multiple weight reduction holes 231 is completely blocked by the flow divider 240. This can significantly reduce the airflow through the weight reduction holes 231, thereby reducing the heat exchange between the end plate 230 and the air. This more effectively prevents the heat of the battery cell pack 100 from being dissipated through the end plate 230, thereby reducing the temperature drop rate of the battery module 1, preventing excessive power loss of the battery module 1, and improving the charging and discharging performance of the battery module 1.

[0048] In some specific embodiments of this utility model, such as Figure 2 As shown, there are multiple flow-blocking elements 240, and the multiple flow-blocking elements 240 include a first flow-blocking element 241 and a second flow-blocking element 242. The first flow-blocking element 241 is blocked at one end of the weight-reducing hole 231, and the second flow-blocking element 242 is blocked at the other end of the weight-reducing hole 231. The first flow-blocking element 241, the second flow-blocking element 242 and the weight-reducing hole 231 define a sealed chamber.

[0049] In this way, the first flow divider 241 and the second flow divider 242 can respectively block both ends of the weight reduction hole 231. The first flow divider 241, the second flow divider 242 and the weight reduction hole 231 in the end plate 230 can jointly define a sealed chamber, so that the air inside the weight reduction hole 231 is in a closed state, further reducing the heat exchange area between the end plate 230 and the air, and more effectively reducing the temperature drop rate of the battery module 1.

[0050] In addition, by simultaneously using the first flow divider 241 and the second flow divider 242 to block the weight reduction hole 231, not only can the air flow be reduced, but the sealed chamber can also be used for heat insulation, further reducing the heat exchange rate between the end plate 230 and the external air, and reducing the rate at which the cell assembly 100 exchanges heat with the external air through the end plate 230, thereby reducing the rate at which the battery module 1 cools down in a low-temperature environment, reducing the energy loss of the battery module 1, and improving the charging and discharging performance.

[0051] Furthermore, it should be noted that when there is only one weight-reducing hole 231, the first flow-blocking member 241, the second flow-blocking member 242, and the weight-reducing hole 231 can jointly define a sealed chamber; while when there are multiple weight-reducing holes 231, the first flow-blocking member 241, the second flow-blocking member 242, and each weight-reducing hole 231 can each define a sealed chamber, that is, the first flow-blocking member 241, the second flow-blocking member 242, and multiple weight-reducing holes 231 can each jointly define multiple sealed chambers.

[0052] In some specific embodiments of this utility model, such as Figures 1-2 As shown, the flow divider 240 is a single component that blocks the weight reduction hole 231.

[0053] The flow divider 240 can be located at one end of the weight reduction hole 231 and block the weight reduction hole 231, or the flow divider 240 can be located inside the weight reduction hole 231 and block the weight reduction hole 231. In this way, the flow divider 240 can be used to isolate the weight reduction hole 231, thereby significantly reducing the airflow through the weight reduction hole 231, reducing the heat exchange between the end plate 230 and the air, and more effectively preventing the heat of the cell pack 100 from being dissipated through the end plate 230. This can reduce the temperature drop rate of the battery module 1 and prevent excessive power loss of the battery module 1. In addition, this arrangement can reduce the number of components in the end assembly 200, making assembly easier.

[0054] Specifically, by placing the flow divider 240 at the end of the end plate 230, it is convenient to assemble the flow divider 240 with the end plate 230, which helps to improve assembly efficiency. In addition, the flow divider 240 can be used to block the end of the weight reduction hole 231, so that the end of the end plate assembly 200 can be kept flat, making the appearance of the battery module 1 more aesthetically pleasing.

[0055] By placing the flow divider 240 inside the weight reduction hole 231, the flow divider 240 can also block the weight reduction hole 231, thereby reducing the airflow through the weight reduction hole 231, reducing the heat exchange between the end plate 230 and the air, and thus reducing the heat released by the cell 110 through the end plate 230. This helps to reduce the temperature drop rate of the cell 100 in low-temperature environments and effectively avoids excessive power loss of the battery module 1.

[0056] In some specific embodiments of this utility model, such as Figure 2 As shown, the flow divider 340 includes at least one sub-flow divider (not shown in the figure), and each sub-flow divider blocks multiple weight reduction holes 231.

[0057] Specifically, when there are multiple sub-barriers, some sub-barriers can block multiple weight-reducing holes 231 in a one-to-many manner, while other sub-barriers can block a single weight-reducing hole 231 in a one-to-one manner; when there is only one sub-barrier, it blocks multiple weight-reducing holes 231 simultaneously. This configuration allows for a smaller number of sub-barriers to cover multiple weight-reducing holes 231, simplifying the structure of the baffle 240 and facilitating the assembly of the end assembly 200.

[0058] Alternatively, the flow divider 340 may include multiple sub-flow dividers, each of which corresponds to and blocks one of the multiple weight-reducing holes 231. With this configuration, each sub-flow divider can block one weight-reducing hole 231. When only a portion of the multiple weight-reducing holes 231 needs to be blocked, the number of sub-flow dividers can be adjusted more precisely according to actual needs, thereby allowing for a more precise adjustment of the number of blocked weight-reducing holes 231.

[0059] In some specific embodiments of this utility model, the battery module 1 further includes a heat insulation component, which is disposed on at least one side of the end plate 230 in the thickness direction to keep the cell assembly 100 warm.

[0060] The insulation component can be located on the side of the end plate 230 facing the cell assembly 100 in the thickness direction. That is, the insulation component is located between the end plate assembly 200 and the cell assembly 100. In this way, the insulation component can prevent the cell assembly 100 from being directly attached to the end plate 230, thereby reducing the heat exchange efficiency between the cell assembly 100 and the end plate 230. Thus, the insulation component can be used to keep the cell assembly 100 warm, preventing the temperature of the cell assembly 100 from dropping too quickly in low-temperature environments.

[0061] Alternatively, the insulation element can be located on the side of the end plate 230 facing away from the cell assembly 100 in the thickness direction. This can further reduce the heat exchange rate between the end plate 230 and the outside air, and the cell assembly 100 can release less heat to the outside through the end plate 230, thereby reducing the rate of temperature drop of the cell 110 in a low-temperature environment.

[0062] Alternatively, there can be multiple insulation components, and these multiple insulation components are respectively located on both sides of the end plate 230 in the thickness direction. In this way, the multiple insulation components have a better insulation effect on the battery module 1, further reducing the heat released from the cell assembly 100 through the end plate assembly 200, and the temperature drop rate of the cell 110 can be lower.

[0063] Therefore, with the combined action of the current-blocking component 240 and the heat-insulating component, the heat released from the cell pack 100 through the end plate assembly 200 can be reduced more effectively. In low-temperature environments, the rate of temperature drop of the cell pack 100 can be slowed down better, thereby reducing the energy loss of the battery module 1 and extending the service life of the battery module 1.

[0064] In some specific embodiments of this utility model, such as Figures 1-3 As shown, there are multiple end plate assemblies 200, and the multiple end plate assemblies 200 include a first end plate assembly 210 and a second end plate assembly 220, which are respectively disposed on opposite sides of the cell assembly 100.

[0065] Specifically, the first end plate assembly 210 and the second end plate assembly 220 can be disposed on opposite sides of the length direction of the cell assembly 100. In this way, the first end plate assembly 210 and the second end plate assembly 220 can be respectively attached to and supported on both sides of the length direction of the cell assembly 100. The amount of heat released by the cell assembly 100 through the first end plate assembly 210 and the second end plate assembly 220 can be reduced, so that the cooling rate of the battery module 1 in the low temperature environment can be reduced, thereby reducing the power loss of the battery module 1.

[0066] The following description, with reference to the accompanying drawings, describes a battery pack according to an embodiment of the present invention. The battery pack includes an outer shell and a battery module 1 according to the above embodiment of the present invention, wherein the battery module 1 is disposed within the outer shell.

[0067] According to the battery pack of the present invention, by utilizing the battery module 1 of the above embodiment of the present invention, the battery module 1 can reduce the heat exchange between the end plate 230 and the air, which is beneficial to reduce the temperature drop rate of the cell 110, thereby avoiding excessive power loss of the battery module 1, and improving the charging and discharging performance of the battery module 1, which is beneficial to improving the vehicle's range in low-temperature environments.

[0068] The following description, with reference to the accompanying drawings, describes a vehicle according to an embodiment of the present invention, the vehicle including a battery pack according to the above embodiment of the present invention.

[0069] According to the vehicle of the present invention, by utilizing the battery pack of the above embodiment of the present invention, the battery module 1 can reduce the heat exchange between the end plate 230 and the air, which is beneficial to reduce the temperature drop rate of the cell 110, thereby avoiding excessive power loss of the battery module 1, and improving the charging and discharging performance of the battery module 1, which is beneficial to improving the vehicle's range in low-temperature environments.

[0070] The battery module 1, battery pack, and other components and operations of the vehicle according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0071] In the description of this specification, references to terms such as "specific embodiment" and "specific example" refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example that is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0072] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery module (1), characterized in that, include: A battery cell assembly (100) includes a plurality of battery cells (110), which are stacked along the thickness direction of the battery cells (110). An end plate assembly (200) is disposed at the end of the cell assembly (100), and the end plate assembly (200) includes an end plate (230) and a current blocking element (240). The end plate (230) is provided with a weight reduction hole (231) that penetrates the end plate (230). The current blocking element (240) is connected to the end plate (230) and at least blocks a portion of the weight reduction hole (231).

2. The battery module according to claim 1, characterized in that, There are multiple weight reduction holes (231), and the flow-blocking member (240) blocks at least a portion of the multiple weight reduction holes (231).

3. The battery module according to claim 2, characterized in that, The flow-blocking element (240) completely blocks the multiple weight-reducing holes (231).

4. The battery module according to claim 3, characterized in that, There are multiple flow-blocking elements (240), and the multiple flow-blocking elements (240) include a first flow-blocking element (241) and a second flow-blocking element (242). The first flow-blocking element (241) is blocked at one end of the weight-reducing hole (231), and the second flow-blocking element (242) is blocked at the other end of the weight-reducing hole (231). The first flow-blocking element (241), the second flow-blocking element (242) and the weight-reducing hole (231) define a sealed chamber.

5. The battery module according to claim 3, characterized in that, The flow-blocking element (240) is one and blocks the weight-reducing hole (231).

6. The battery module according to claim 3, characterized in that, The flow divider (240) includes at least one sub-flow divider, and each sub-flow divider blocks multiple of the weight reduction holes (231); or The flow-blocking element (240) includes multiple sub-flow-blocking elements, and the multiple sub-flow-blocking elements block the multiple weight-reducing holes (231) one by one.

7. The battery module according to claim 1, characterized in that, Also includes: A thermal insulation component is disposed on at least one side of the end plate (230) in the thickness direction to insulate the battery cell assembly (100).

8. The battery module according to claim 1, characterized in that, The end plate assembly (200) includes a first end plate assembly (210) and a second end plate assembly (220), which are respectively disposed on opposite sides of the battery cell assembly (100).

9. A battery pack, characterized in that, include: outer shell; The battery module (1) according to any one of claims 1-8 is disposed in the housing.

10. A vehicle, characterized in that, Includes the battery pack according to claim 9.

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