Battery module and battery pack

Abstract

The utility model discloses a battery module and a battery pack, the battery module comprises a plurality of battery cells and a plurality of elastic buffer parts, the battery cells are sequentially arranged along the thickness direction, each elastic buffer part is compressed and configured between two corresponding battery cells, each elastic buffer part is provided with an accommodating space, and the accommodating space is used for accommodating a heat insulation part. In the battery module provided by the invention, the elastic buffer pieces are arranged between the adjacent battery cells and play a role in matching with extrusion deformation in the module forming process, the battery module also has a certain heat insulation effect, and the elastic buffer pieces have accommodating spaces, so that the battery module does not need to be additionally provided with heat insulation pieces in the design of the battery module in a general use scene; in special use scenes, such as a severe environment or an environment with a high requirement on high temperature resistance, a heat insulation piece can be arranged in the accommodating space, so that a better heat insulation effect can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field more specifically, relate to a kind of battery module and battery package. BACKGROUND

[0002] The current energy storage battery pack is mainly in liquid cooling mode, which is composed of a main battery module structure, a battery lower box, a shell, a battery management assembly and a protection device. The existing energy storage battery module is mostly composed of elastic buffers, such as strip-shaped foam, to achieve the insulation between the battery cells, and is equipped with end plates and steel belts and other auxiliary components to form a separate battery module. With the continuous development of the energy storage battery field, the thermal management of the energy storage battery pack has attracted more and more attention. The battery cells in the battery module are often insulated and protected by foam. However, in special use scenarios, foam alone cannot provide good high-temperature resistance. If only thick materials such as aerogel that can withstand high temperatures are used for insulation, they cannot be compressed and deformed, so they cannot be used for compression and deformation during module formation. SUMMARY

[0003] To solve one of the above technical defects, the present application provides a battery module and a battery pack.

[0004] The present application adopts the following technical solutions:

[0005] According to the first aspect of the present application, a battery module is provided, comprising:

[0006] a plurality of battery cells, each of which is arranged in sequence along the thickness direction;

[0007] a plurality of elastic buffers, each of which is arranged between two corresponding battery cells, and the elastic buffer has a containing space for containing an insulating member.

[0008] Optionally, a hollow slot is formed on the elastic buffer, and the hollow slot forms the containing space.

[0009] Optionally, the elastic buffer has four strips, and the four strips are connected in sequence.

[0010] The four strips form the containing space.

[0011] The elastic buffer is a one-piece component.

[0012] Optionally, the battery cells are provided with large faces on both sides along the thickness direction.

[0013] The four strips are respectively attached to the four edges of the large face.

[0014] Optionally, the battery module includes an insulating member.

[0015] The thermal insulation member is accommodated in the accommodation space.

[0016] Optionally, the elastic buffer member restores deformation when it is separated from the battery cell at least on one side in the thickness direction, the thickness of the elastic buffer member is greater than the thermal insulation member.

[0017] Optionally, the elastic buffer member is thermal insulation cotton, and the thermal insulation member is aerogel.

[0018] Optionally, the battery module comprises an end plate and an insulating sheet, the end plate is located at two ends of each battery cell.

[0019] The insulating sheet is located between the end plate and the battery cell.

[0020] The second object of the present application is to provide a battery pack, comprising:

[0021] A bottom plate;

[0022] A top shell connected to the bottom plate, the top shell and the bottom plate form a cavity therebetween;

[0023] The battery module described above is arranged in the cavity.

[0024] Optionally, a connecting edge is arranged on the opening edge of the top shell, the connecting edge is bent to form a double-layer edge structure.

[0025] One end of the fastener is connected to the bottom plate through the double-layer edge structure, and the other end of the fastener is limited in the double-layer edge structure.

[0026] By adopting the technical scheme, the present application has the following beneficial effects:

[0027] In the battery module of the present application, the elastic buffer member arranged between adjacent battery cells plays a role of cooperating with extrusion deformation in the process of forming the module, the battery module also has a certain thermal insulation effect, the elastic buffer member has an accommodation space, and in general use scenarios, the battery module of the present application does not need to be additionally provided with a thermal insulation member, and in special use scenarios, such as harsh environments or high-temperature-resistant environments, a thermal insulation member can be arranged in the accommodation space to achieve better thermal insulation effect.

[0028] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which are part of the present application, serve to provide a further understanding of the present application, and the schematic embodiments of the present application and the descriptions thereof serve to explain the present application, but do not constitute an improper limitation on the present application. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings. In the drawings:

[0030] Figure 1 A structural schematic diagram of a battery pack provided by the embodiment of the present application is shown;

[0031] Figure 2 A partial view of an explosion diagram of a battery pack provided by the embodiment of the present application is shown;

[0032] Figure 3 An explosion diagram of a partial structure of a battery module of a battery pack provided by the embodiment of the present application is shown;

[0033] Figure 4 A partial structural diagram of a battery pack provided by the embodiment of the present application is shown.

[0034] In the drawings: 1, battery module; 11, battery cell; 12, elastic buffer; 121, strip; 122, accommodating space; 13, end plate; 14, insulating sheet; 15, steel belt; 2, bottom plate; 3, top shell; 31, connecting edge; 4, CCS board; 5, BMS slave board.

[0035] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be described clearly and completely in conjunction with the drawings of the embodiments of the present application, and the following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0037] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "mounting", "connection" should be understood broadly, for example, it can be fixed connection, also can be detachable connection, or integrally connected, it can be mechanical connection, also can be electrical connection, it can be direct connection, also can be indirectly connected through intermediate medium, for ordinary skilled in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to specific circumstances.

[0039] Referring to Figures 1 to 4 The battery module 1 provided by the embodiment of the application comprises a plurality of battery cells 11 and a plurality of elastic buffer members 12. The battery cells 11 are arranged in sequence along the thickness direction, and the elastic buffer members 12 are respectively arranged in compression between two corresponding battery cells 11. The elastic buffer member 12 has an accommodation space 122 for accommodating a heat insulation member (not shown).

[0040] In the battery module 1 of the application, the elastic buffer member 12 is arranged between adjacent battery cells, which plays a role of cooperating with extrusion deformation in the process of module forming. The battery module 1 also has a certain heat insulation effect. The elastic buffer member 12 has the accommodation space 122. In general use scenarios, the battery module 1 of the application does not need to be additionally provided with a heat insulation member. In special use scenarios, such as harsh environments or high-temperature-resistant environments, the heat insulation member can be arranged in the accommodation space 122, which can achieve better heat insulation effect.

[0041] In some possible embodiments, referring to Figure 3 The elastic buffer member 12 is provided with a hollow slot, and the hollow slot encloses the accommodation space 122. The elastic buffer member 12 can be a closed ring and can be sleeved outside the heat insulation member, so as to fully utilize the space between adjacent battery cells 11.

[0042] In some possible embodiments, referring to Figure 3 The elastic buffer member 12 has four strips 121, the four strips 121 are connected in sequence and perpendicularly, the four strips 121 enclose the accommodation space 122, and the elastic buffer member 12 is an integral piece.

[0043] The battery cell 11 is provided with a large surface on each side along the thickness direction. The four strips 121 are respectively attached to four edges of the large surface, so as to stably support between two adjacent battery cells 11. The edge of the large surface of the battery cell 11 is prevented from being damaged due to collision with the edge of the adjacent battery cell 11.

[0044] In some possible embodiments, the battery module 1 comprises a heat insulation member, and the heat insulation member can be accommodated in the accommodation space 122. In some special environments, the heat insulation member can be arranged in the accommodation space 122, so as to achieve better heat insulation effect.

[0045] In some possible implementations, when the elastic buffer 12 is released from the compression of the battery cell 11 at least on one side along its thickness direction, the elastic buffer 12 recovers its deformation, and the thickness of the elastic buffer 12 is greater than that of the heat insulation component. In this implementation, the elastic buffer 12 is thicker than the heat insulation component in its natural state without external force. During the molding process, the elastic buffer 12 is first compressed, playing a role in cooperating with the compression deformation, ultimately causing the heat insulation component to abut against the battery cell 11 on both sides. It should be noted that the heat insulation component is an optional accessory and can be installed according to actual conditions. Because the thickness of the heat insulation component is less than that of the elastic buffer 12, the installation of the heat insulation component will not affect the overall length of the battery module 1.

[0046] In some possible implementations, the elastic cushioning element 12 is thermal insulation cotton, and the thermal insulation element is aerogel.

[0047] The space between adjacent battery cells 11 is surrounded by ordinary heat insulation cotton. Aerogel can be embedded in the inner space of the heat insulation cotton as needed. In general use cases, the aerogel arrangement is not required. In special use cases (harsh environments / environments with high temperature resistance requirements), the inner space 122 can be filled with aerogel, which can achieve better heat insulation effect (aerogel has a stronger heat insulation effect than ordinary heat insulation cotton). However, since aerogel is generally thick, the conventional direct use of aerogel will lead to an increase in the length of the module. In order to ensure that the overall length of the module does not change, the heat insulation cotton in this application can be set as a U-shaped frame structure, with ordinary heat insulation cotton on the outside and aerogel embedded in the inner ring, to avoid or reduce the impact of aerogel on the length of the battery module.

[0048] See some possible implementations. Figure 2 and Figure 3 As shown, the battery module 1 includes an end plate 13 and an insulating sheet 14. The end plate 13 is located at both ends of each of the battery cells 11, and the insulating sheet 14 is located between the end plate 13 and the battery cells 11. The battery module 1 may also include a steel strip 15, which is sleeved on the end plate 13, the insulating sheet 14, and the outside of each battery cell 11.

[0049] This application also provides a battery pack, including: a base plate 2, a top shell 3, and the aforementioned battery module 1. The top shell 3 is connected to the base plate 2, and a cavity is formed between the top shell 3 and the base plate 2, and the battery module 1 is disposed within the cavity.

[0050] Optionally, the opening edge of the top shell 3 is provided with a connecting edge 31, which is bent to form a double-layer edge structure. One end of the fastener passes through the double-layer edge structure and is connected to the bottom plate 2, while the other end of the fastener is confined within the double-layer edge structure.

[0051] The battery module 1 provided by the embodiment of the application is covered by the top shell 3. Generally, the battery pack needs to ensure the overall structural strength of the battery pack on the basis of controlling the cost. The reinforcing pressing strips are arranged around the top shell 3 by welding. The reinforcing pressing strips are fixed around the top shell 3 by bolts. Arranging the reinforcing pressing strips will increase the cost to a certain extent. The pressure under long-time use will cause deformation around the whole top shell 3, thereby affecting the overall sealing performance of the battery pack. Therefore, the embodiment of the application adopts the turn-up type integrated design to replace the reinforcing pressing strips around the opening of the top shell 3. The four edges of the top shell 3 are provided with the bent double-layer edge structure to ensure the overall structural strength of the battery pack, reduce the influence of external force on the structure of the battery pack, and reduce the cost to a certain extent.

[0052] Referring to Figure 1 and Figure 2 As shown in the figures, the battery pack further comprises a CCS plate 4 and a BMS slave plate 5. The CCS plate 4 covers the top of each battery module 1. The top shell 3 is connected to the bottom plate 2. The top shell 3 and the bottom plate 2 enclose a cavity. The BMS slave plate 5 is arranged on the shell wall of the top shell 3.

[0053] The above is only a preferred embodiment of the application, and does not limit the application in any form. Although the application has been disclosed as above, it is not intended to limit the application. Any skilled person in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical solution of the application, thereby obtaining equivalent embodiments. Any simple modification, equivalent change and modification of the above embodiments based on the technical essence of the application are still within the scope of the application.

Claims

1. A battery module, characterized by, The battery module comprises: a plurality of battery cells arranged in sequence along a thickness direction; a plurality of elastic buffer members, each of which is arranged between two corresponding battery cells in a compressed manner, and each of which has an accommodation space for accommodating a heat insulation member.

2. The battery module of claim 1, wherein, The elastic buffer member is provided with a hollow groove, and the hollow groove forms the accommodation space.

3. The battery module of claim 1, wherein, The elastic buffer member has four strips, and the four strips are connected in sequence and perpendicularly. The four strips form the accommodation space. The elastic buffer member is an integral part.

4. The battery module of claim 3, wherein, The battery cell is provided with a large surface on each side along the thickness direction. The four strips are respectively attached to the four edges of the large surface.

5. The battery module of claim 1, wherein, The battery module further comprises a heat insulation member. The heat insulation member is accommodated in the accommodation space.

6. The battery module of claim 5, wherein, When at least one side of the elastic buffer member along the thickness direction is separated from the battery cell, the elastic buffer member restores the deformation, and the thickness of the elastic buffer member is greater than that of the heat insulation member.

7. The battery module of claim 1, wherein, The elastic buffer member is thermal insulation cotton, and the heat insulation member is aerogel.

8. The battery module of claim 1, wherein, The battery module further comprises an end plate and an insulating sheet, and the end plate is located at both ends of each battery cell. The insulating sheet is located between the end plate and the battery cell.

9. A battery pack, characterized by, The battery module comprises: a bottom plate; a top shell connected to the bottom plate, and a cavity formed between the top shell and the bottom plate; The battery module as claimed in any one of claims 1-8 is arranged in the cavity.

10. The battery pack of claim 9, wherein, The opening edge of the top shell is provided with a connecting edge, and the connecting edge forms a double-layer edge structure through bending; One end of a fastener penetrates the double-layer edge structure and is connected to the bottom plate, and the other end of the fastener is limited in the double-layer edge structure.

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