Battery pack

Abstract

The utility model provides a battery pack and relates to the technical field of batteries. The battery pack comprises a box body, a battery module and an expansion component, the expansion component is attached to one side of the battery module, the expansion component and the battery module are both arranged in the box body, and the expansion component can be switched from a first state to a second state; when the expansion component is in the first state, a gap is formed between the expansion component and the box body; and when the expansion component is in the second state, the expansion component is attached to the box body. The battery pack provided by the utility model can solve the problems that the fixing mode of the battery module in the existing battery pack is relatively complicated and the assembly is relatively inconvenient.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack. Background Art

[0002] As the core power component of electric vehicles, the battery pack plays a vital role in the handling performance, safety, and service life of electric vehicles.

[0003] The existing battery pack generally includes a lower box, an upper box and a battery module. The lower box is composed of a front side beam, a rear side beam, a left side beam, a right side beam, a longitudinal beam and a cross beam, etc. The battery module is arranged in the lower box, and the upper box cover is arranged on the lower box. In order to ensure the safe operation of the battery pack, it is necessary to ensure the stability of the installation of the battery module in the battery pack, which requires that a structure for connecting with the lower box be provided on the battery module, and the structure needs to be fixed to the lower box during assembly. In this way, the fixing method of the battery module is relatively complicated and the assembly is relatively inconvenient. Utility Model Content

[0004] In view of this, the present application provides a battery pack to solve the problem that the battery module fixing method in the existing battery pack is relatively complicated and the assembly is relatively inconvenient.

[0005] The present application provides a battery pack, the battery pack comprising a box, a battery module and an expansion member, the expansion member is attached to one side of the battery module, the expansion member and the battery module are both arranged inside the box, and the expansion member can be switched from a first state to a second state;

[0006] When the expansion member is in the first state, there is a gap between the expansion member and the box body;

[0007] When the expansion member is in the second state, the expansion member is in contact with the box.

[0008] Preferably, the expansion member comprises a container and an expansion body, the expansion body is vacuum-sealed inside the container, and when the expansion member is in the first state, the expansion body is compressed.

[0009] Preferably, the battery module comprises a plurality of battery cells, the plurality of battery cells are stacked along a first direction, and the expansion member is provided at least at one end of the battery module in the first direction.

[0010] Preferably, the battery pack further comprises a pull rod, the pull rod extends along the first direction, and any of the battery cells in the battery module is bonded to the pull rod.

[0011] Preferably, the box body comprises an outer shell, a connecting beam and a plurality of supporting beams, the connecting beam extends along the second direction, two ends of the connecting beam are fixed to the inner side wall of the outer shell, the supporting beam extends along the first direction, and two ends of the supporting beam are respectively connected to the inner side wall of the outer shell and the connecting beam;

[0012] The connecting beam and the plurality of supporting beams divide the interior of the housing into a plurality of placement cavities. The battery pack includes a plurality of battery modules, and the plurality of battery modules are respectively arranged in the plurality of placement cavities.

[0013] Preferably, the supporting beam comprises a first plate and a second plate connected to each other, both ends of the first plate in the second direction protrude relative to the second plate, and the two battery modules located on both sides of the second plate are respectively arranged on both ends of the first plate.

[0014] Preferably, the plurality of battery modules are divided into two groups, the two groups of battery modules are respectively located on both sides of the connecting beam in the first direction, and the battery modules in the two groups correspond to each other one by one;

[0015] An abutting member is provided between the battery modules in one group and the corresponding battery modules in another group, and when the expansion member is in the second state, the abutting member abuts against the expansion member.

[0016] Preferably, the abutting member comprises a fixed plate and two extension plates, and the two extension plates are respectively connected to two ends of the fixed plate in the first direction;

[0017] The fixing plate is fixed to the connecting beam, and when the expansion member is in the second state, the two extension plates respectively abut against two battery modules located on both sides of the abutting member in the first direction.

[0018] Preferably, the battery pack further comprises a supporting member, the supporting member extends along the first direction, and two ends of the supporting member in the first direction are respectively connected to the two extending plates.

[0019] Preferably, the battery pack also includes a cooling pipe, which is arranged on the battery module. The cooling pipe arranged on one battery module in one group is connected to the cooling pipe arranged on the corresponding battery module in another group through an adapter, and the adapter is located between the two extension plates.

[0020] During the assembly of the battery pack of the present application, before the battery module is assembled, the expansion member on the battery module is in a first state. At this time, the volume of the battery module and the expansion member as a whole is small, which can facilitate the assembly of the battery module. When the battery module is installed in the box, there is a gap between the expansion member and the box. After the installation is completed, the expansion member expands so that the expansion member abuts against the box. At this time, there is no longer a gap between the battery module and the box, and the battery module can be fixed. In this way, the battery pack of the present application can fix the battery module by the expansion of the expansion member, which simplifies the fixing method of the battery module and improves the convenience of assembling the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic structural diagram showing a battery pack from one perspective of an embodiment of the utility model;

[0023] Figure 2 A schematic structural diagram showing a battery pack from another perspective of an embodiment of the utility model;

[0024] Figure 3 A schematic diagram showing the structure of a battery module is shown;

[0025] Figure 4 A schematic diagram showing the structure of the box;

[0026] Figure 5 A diagram showing the relative positions of the box and the battery module;

[0027] Figure 6 A diagram showing the relative positions of the supporting beam and the battery module;

[0028] Figure 7 A diagram showing the relative positions of the abutment member and the support member in a disassembled state;

[0029] Figure 8 A diagram showing the relative positions of the abutment member and the support member in a connected state.

[0030] Icons: 1-box; 11-first side beam; 12-second side beam; 13-third side beam; 14-fourth side beam; 15-connecting beam; 151-first hole; 16-supporting beam; 161-first plate; 162-second plate; 17-stabilizing plate; 2-battery module; 3-expansion member; 4-pull rod; 5-cooling pipe; 6-transfer pipe; 7-abutment member; 71-fixing plate; 711-second hole; 72-extension plate; 73-fastening plate; 8-support member; 9-bolt; L1-first direction; L2-second direction; L3-third direction. DETAILED DESCRIPTION

[0031] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0032] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0033] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0034] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0035] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0036] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0037] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0038] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0039] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0040] The following combination will combine Figures 1 to 8 The battery pack of the present application is described in Figures 1 to 8 In the embodiment, the first direction L1, the second direction L2 and the third direction L3 are perpendicular to each other.

[0041] like Figures 1 to 8 As shown, the battery pack includes a case 1, a battery module 2 and an expansion member 3, the expansion member 3 is fitted with one side of the battery module 2, the expansion member 3 and the battery module 2 are both arranged inside the case 1, and the expansion member 3 can be switched from a first state to a second state; when the expansion member 3 is in the first state, there is a gap between the expansion member 3 and the case 1; when the expansion member 3 is in the second state, the expansion member 3 is fitted with the case 1. In the process of assembling the battery pack of the present application, before the battery module 2 is assembled, the expansion member 3 on the battery module 2 is in the first state, at which time the battery module 2 and the expansion member 3 have a small overall volume, which can facilitate the assembly of the battery module 2, and when the battery module 2 is installed in the case 1, there is a gap between the expansion member 3 and the case 1. After the installation is completed, the expansion member 3 expands, so that the expansion member 3 abuts against the case 1, and at this time there is no longer a gap between the battery module 2 and the case 1, and the battery module 2 can be fixed. In this way, the battery pack of the present application can fix the battery module 2 by the expansion of the expansion member 3, which simplifies the fixing method of the battery module 2 and improves the convenience of assembling the battery module 2.

[0042] Furthermore, the expansion member 3 includes a container and an expansion body, and the expansion body is vacuum-sealed inside the container. When the expansion member 3 is in the first state, the expansion body is compressed. After the battery module 2 and the expansion member 3 are installed in the battery pack, the expansion body can be expanded by puncturing the container. After the expansion body is expanded, it can fill the gap between the battery module 2 and the box body 1, thereby fixing the battery module 2.

[0043] Optionally, the container is a bagged component capable of being evacuated, for example, the container may be a vacuum bag. The expansion body is a structure that can be compressed under the action of an external force and can expand and recover after the external force disappears, for example, the expansion body may be foam.

[0044] In addition, the battery module 2 is fixed by the expansion member 3, which can reduce the use of thermal conductive structural adhesive and reduce the cost of the battery pack.

[0045] In an embodiment of the present application, the battery module 2 includes a plurality of battery cells, which are stacked along a first direction L1, and an expansion member 3 is provided at at least one end of the battery module 2 in the first direction L1, that is, at least one of the two battery cells located on the edge in the first direction L1 is bonded to the expansion member 3, so that the expansion member 3 can expand to fill the gap between the battery module 2 and the box body 1 in the first direction L1, so as to fix the battery module 2.

[0046] Optionally, the expansion member 3 is adhered to only one of the two battery cells at the edge in the first direction L1 , or the expansion member 3 is adhered to both of the two battery cells at the edge in the first direction L1 .

[0047] Furthermore, if Figure 3 As shown, the battery pack also includes a pull strip 4, which extends along the first direction L1. Any battery cell in the battery module 2 is bonded to the pull strip 4. The pull strip 4 is located on one side of the battery module 2 in the third direction L3. The pull strip 4 can improve the stability of the fixation between the battery cells in the battery module 2.

[0048] Optionally, each battery module 2 is correspondingly provided with two pull bars 4, and the two pull bars 4 are arranged at intervals along the second direction L2.

[0049] In the embodiments of the present application, Figure 4 As shown, the box body 1 includes a shell, a connecting beam 15 and a plurality of supporting beams 16. The shell is a rectangular parallelepiped structure formed by connecting the first side beam 11, the second side beam 12, the third side beam 13 and the fourth side beam 14 end to end. The connecting beam 15 extends along the second direction L2, and the two ends of the connecting beam 15 are respectively connected to the middle of the first side beam 11 and the middle of the third side beam 13. The supporting beam 16 extends along the first direction L1, and the two ends of the supporting beam 16 are respectively connected to the second side beam 12 and the fourth side beam 14, and the connecting beam 15 crosses the supporting beam 16. Placement cavities are enclosed between the connecting beams 15, between the connecting beams 15 and the first side beam 11, and between the connecting beams 15 and the third side beam 13, so that multiple placement cavities are enclosed inside the box body 1, and multiple battery modules 2 are respectively arranged in the multiple placement cavities.

[0050] like Figure 4 and Figure 6 As shown, the supporting beam 16 includes a first plate 161 and a second plate 162 connected to each other, the first plate 161 is perpendicular to the third direction L3, the second plate 162 is perpendicular to the second direction L2, both ends of the first plate 161 in the second direction L2 are protruding relative to the second plate 162, and the two battery modules 2 located on both sides of the second plate 162 are supported on the first plate 161 respectively, and are bonded to the first plate 161 through a heat-conducting structural adhesive. Stabilizing plates 17 are provided on the first side beam 11 and the third side beam 13, and one end of the battery module 2 located at the edge in the second direction L2 can be bonded to the stabilizing plate 17.

[0051] In addition, if Figure 1 and Figure 2 As shown, each battery module 2 is correspondingly provided with two cooling tubes 5 , and the two cooling tubes 5 are bonded to both sides of the battery module 2 in the third direction L3 , so as to cool the battery module 2 .

[0052] In an embodiment of the present application, the battery modules 2 are divided into two groups, the battery modules 2 located on the same side of the connecting beam 15 in the first direction L1 among the multiple battery modules 2 are the first group, and the battery modules 2 located on the other side of the connecting beam 15 in the first direction L1 among the multiple battery modules 2 are the second group, the number of battery modules 2 in the two groups is the same, and the battery modules 2 in the first group correspond one-to-one to the battery modules 2 in the second group, and the positions of the corresponding two battery modules 2 in the second direction L2 overlap.

[0053] Furthermore, if Figure 1 and Figure 5 As shown, the battery pack further includes an abutment member 7, and an abutment member 7 is provided between the battery module 2 in the first group and the corresponding battery module 2 in the second group. When the expansion member 3 is in the second state, the expansion member 3 abuts against the abutment member 7 and the connecting beam 15, and the abutment member 7 can apply force to the battery module 2 through the abutment member 7 to further ensure the stability of the installation of the battery module 2.

[0054] Alternatively, if Figure 7 and Figure 8 As shown, the abutting member 7 includes a fixing plate 71 and two extension plates 72, the two extension plates 72 are connected to the two ends of the fixing plate 71 in the first direction L1, and the fixing plate 71 can be fixed to the connecting beam 15 by screws. When the expansion member 3 is in the first state, there is a gap between the expansion member 3 provided on the battery modules 2 on both sides and the two extension plates 72; when the expansion member 3 is in the second state, the expansion member 3 provided on the battery modules 2 on both sides expands, so that the two extension plates 72 abut against the expansion member 3 on both sides, thereby providing constraints for the battery modules 2 on both sides to ensure the stability of the installation of the battery modules 2.

[0055] In the embodiment of the present application, the battery pack may further include a support member 8, which is rod-shaped and extends along the first direction L1, and the two ends of the support member 8 are respectively detachably connected to the two extension plates 72. When the expansion force of the battery modules 2 at the two ends of the abutment member 7 increases after long-term use, the support member 8 can support the two extension plates 72 to prevent the two extension plates 72 from being tilted by force.

[0056] Furthermore, a fastening plate 73 is provided on the extension plate 72, and the fastening plate 73 can be connected to the end of the support member 8 by bolts 9. When the support member 8 is not installed, the space between the two extension plates 72 is open, which can facilitate the installation of other components between the two extension plates 72.

[0057] Optionally, a dimension of the abutting member 7 in the second direction L2 is substantially equal to a length of the battery module 2 in the second direction L2.

[0058] like Figure 2and Figure 5 As shown, the two cooling pipes 5 on the upper side of the corresponding two battery modules 2 can be connected through a transfer pipe 6, which is located between the two extension plates 72, and can improve the space utilization rate in the battery pack. The transfer pipe 6 is connected to the pipeline outside the battery module 2 to circulate with the coolant. The two cooling pipes 5 on the lower side of the corresponding two battery modules 2 are also connected through a transfer pipe 6, which is located on the lower side of the connecting beam 15. The transfer pipe 6 at the bottom can be connected to a connecting pipe, which extends between the two extension plates 72 through the first hole 151 on the connecting beam 15 and the second hole 711 on the fixing plate 71, so that the connecting pipe is connected to the pipeline outside the battery module 2 to circulate with the coolant.

[0059] When the expansion members 3 are bonded to the two battery cells at the edge in the first direction L1, the battery module 2 and the two expansion members 3 can be put into the box without pressure, and there is a gap between the expansion members 3 and the connecting beam 15. After the box is put into the box, the abutment member 7 is fixed on the connecting beam 15, and then the receiving part is punctured to expand the expansion body, and the expansion body becomes thicker and abuts against the extension plate 72 and the connecting beam 15, so as to fix the battery module 2.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A battery pack, characterized in that: The battery pack includes a box, a battery module and an expansion member, wherein the expansion member is attached to one side of the battery module, the expansion member and the battery module are both arranged inside the box, and the expansion member can be switched from a first state to a second state; When the expansion member is in the first state, there is a gap between the expansion member and the box body; When the expansion member is in the second state, the expansion member is in contact with the box.

2. The battery pack according to claim 1, characterized in that: The expansion member includes a container and an expansion body, wherein the expansion body is vacuum-sealed inside the container, and when the expansion member is in a first state, the expansion body is compressed.

3. The battery pack according to claim 1 or 2, characterized in that: The battery module includes a plurality of battery cells, the plurality of battery cells are stacked along a first direction, and the expansion member is disposed at at least one end of the battery module in the first direction.

4. The battery pack according to claim 3, characterized in that: The battery pack further includes a pull bar extending along the first direction, and any of the battery cells in the battery module is bonded to the pull bar.

5. The battery pack according to claim 3, characterized in that: The box body comprises an outer shell, a connecting beam and a plurality of supporting beams, wherein the connecting beam extends along the second direction, and both ends of the connecting beam are fixed to the inner side wall of the outer shell, and the supporting beam extends along the first direction, and both ends of the supporting beam are respectively connected to the inner side wall of the outer shell and the connecting beam; The connecting beam and the plurality of supporting beams divide the interior of the housing into a plurality of placement cavities. The battery pack includes a plurality of battery modules, and the plurality of battery modules are respectively arranged in the plurality of placement cavities.

6. The battery pack according to claim 5, characterized in that: The supporting beam includes a first plate and a second plate connected to each other, two ends of the first plate in the second direction protrude relative to the second plate, and the two battery modules located on both sides of the second plate are respectively arranged on the two ends of the first plate.

7. The battery pack according to claim 5, characterized in that: The multiple battery modules are divided into two groups, the two groups of battery modules are respectively located on both sides of the connecting beam in the first direction, and the battery modules in the two groups correspond to each other one by one; An abutting member is provided between the battery modules in one group and the corresponding battery modules in another group, and when the expansion member is in the second state, the abutting member abuts against the expansion member.

8. The battery pack according to claim 7, characterized in that: The abutting member comprises a fixed plate and two extension plates, wherein the two extension plates are respectively connected to two ends of the fixed plate in the first direction; The fixing plate is fixed to the connecting beam, and when the expansion member is in the second state, the two extension plates respectively abut against two battery modules located on both sides of the abutting member in the first direction.

9. The battery pack according to claim 8, characterized in that: The battery pack further includes a supporting member extending along the first direction, and two ends of the supporting member in the first direction are respectively connected to the two extending plates.

10. The battery pack according to claim 8, characterized in that: The battery pack also includes a cooling pipe, which is arranged on the battery module. The cooling pipe arranged on one battery module in one group is connected to the cooling pipe arranged on the corresponding battery module in another group through an adapter, and the adapter is located between the two extension plates.

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