Soft package battery cell module structure and battery pack

Abstract

The utility model provides a soft package battery cell module structure and a battery pack. The soft package battery cell module structure comprises a bottom plate, a supporting plate and soft package battery cells, wherein the supporting plates are vertically arranged on the upper surface of the bottom plate, the multiple supporting plates are arranged in parallel at equal intervals in the width direction of the bottom plate, and a first mounting space is defined by every two adjacent supporting plates and the bottom plate; and the plurality of soft package battery cells are configured to be arranged in the plurality of first mounting spaces. The soft package battery cell has the characteristics of high structural strength, high space utilization rate, low production cost and easiness in assembly, and can improve the matching degree and applicability of the soft package battery cell in the field of new energy automobile power batteries.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, in particular to a structure of a soft-pack battery cell module. The utility model also relates to a battery pack including the above-mentioned structure of the soft-pack battery cell module. Background Art

[0002] With the rapid development of the industrialization of power batteries, the types of battery cells have also begun to progress in a diversified direction. According to different encapsulation processes, battery cells can be classified into cylindrical battery cells, square shell battery cells and soft-pack battery cells.

[0003] The biggest difference between soft-pack battery cells and cylindrical battery cells and square shell battery cells is that the outer shell of soft-pack battery cells is usually composed of multiple layers of composite aluminum plastic film (Aluminum Plastic Laminate, APL), including materials such as polypropylene (PP), aluminum foil (Al) and polyester (PET). These materials have good flexibility and barrier properties, and can effectively prevent moisture and oxygen from entering the battery interior. However, compared with cylindrical battery cells and square shell battery cells with aluminum plastic outer shells, the outer shell of soft-pack battery cells has low strength, poor compressive resistance and supporting ability, which hinders the application of soft-pack battery cells in the new energy vehicle industry.

[0004] In order to avoid damage to soft-pack battery cells, currently, in the existing battery pack solutions using soft-pack battery cells, the soft-pack battery cell module has structures such as end plates, side plates, and lower shells that play a role in supporting and limiting the soft-pack battery cells. Therefore, the number of parts for structural support in the soft-pack battery cell pack is large, the cost is high, the assembly is inconvenient, and it also affects the overall space utilization rate and energy density of the battery pack. This makes the application range of soft-pack battery cells in the new energy vehicle field far less than that of square shell battery cells. Summary of the Utility Model

[0005] In view of this, the utility model aims to propose a structure of a soft-pack battery cell module, which has the characteristics of high structural strength, high space utilization rate, low production cost and easy assembly, and can improve the matching degree and applicability of soft-pack battery cells in the field of power batteries for new energy vehicles.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] On the one hand, a structure of a soft-pack battery cell module of the utility model includes a bottom plate;

[0008] Support plates, vertically arranged on the upper surface of the bottom plate, and are configured to be multiple arranged in parallel at equal intervals along the width direction of the bottom plate, and the adjacent two support plates and the bottom plate enclose a first installation space;

[0009] Soft-pack battery cells, configured to be multiple arranged in the multiple first installation spaces.

[0010] Furthermore, the bottom plate comprises a plurality of unit plates fixedly connected to each other.

[0011] Furthermore, the unit plate is a hollow plate with a cavity, and the side walls of two adjacent unit plates form a support rib.

[0012] Furthermore, a plurality of the support plates are symmetrically distributed about the geometric center of the bottom plate, and a second installation space is reserved between the support plates at the head and tail ends and the two side edges in the width direction of the bottom plate.

[0013] Compared with the prior art, the present utility model has the following advantages:

[0014] In the soft-pack battery cell module structure of the present utility model, the support structure composed of the bottom plate and the support plates vertically arranged at equal intervals on the bottom plate has a plurality of first installation spaces that limit and protect the soft-pack battery cells. During the assembly process, the staff installs the soft-pack battery cells in each of the first installation spaces respectively. Compared with the soft-pack battery cell module solution with a plurality of support parts in the prior art, the support structure composed of the support plates and the bottom plate in the present application not only has a simple structure, low cost, and is easy to assemble, but also can be directly integrated as the lower shell of the battery pack and the battery edge combing strip structure, thereby enabling the battery pack to have a higher energy density and space utilization rate. Therefore, the present utility model has the characteristics of high structural strength, high space utilization rate, low production cost, and easy assembly, and can improve the matching degree and applicability of the soft-pack battery cells in the field of power batteries for new energy vehicles.

[0015] In addition, by setting the bottom plate as an integral body formed by the abutting and welding fixation of the side walls of a plurality of unit plates, the overall length of the bottom plate can be adjusted by adjusting the number of unit plates, achieving the effect of increasing the optional size of the bottom plate and reducing the design and assembly difficulty of the battery pack.

[0016] Secondly, by setting the bottom plate as a hollow metal plate structure with a cavity, the side walls of two adjacent unit plates abut against each other to form a support rib structure with improved overall structural strength and bearing capacity. The support rib makes the bottom plate not easily deformed. At the same time, the unit plate with a hollow structure is lighter in weight, which is beneficial to reducing the weight of the battery pack and even the whole vehicle, meeting the lightweight principle of the battery pack design.

[0017] Furthermore, by reserving a second installation space between the head and tail ends of the arranged support plates and the two side edges in the width direction of the bottom plate, it is convenient for the installation and setting of the cooling device and the charge and discharge management device of the battery pack. The form in which the support plates are symmetrically distributed about the geometric center of the bottom plate can balance the center of gravity position, making the battery pack have better dynamic stability.

[0018] On the other hand, the present utility model also provides a battery pack provided with the above-mentioned soft-pack battery cell module structure.

[0019] The battery pack of the present utility model includes a soft-pack battery cell module structure, adopting the soft-pack battery cell module structure as described above;

[0020] Side beams, symmetrically and vertically arranged at both ends in the width direction of the bottom plate;

[0021] End plates, symmetrically and vertically arranged at both ends in the length direction of the bottom plate;

[0022] A top plate, arranged at the top of the side beams and the end plates, and parallel to the bottom plate.

[0023] Further, the side beam includes a plurality of unit beams;

[0024] The plurality of unit beams are stacked along their own height directions to form the side beam.

[0025] Further, an intermediate beam is vertically connected at the middle position between the two side beams;

[0026] The number of the soft-pack battery cell module structures is two groups, and they are respectively located on both sides of the intermediate beam.

[0027] Further, a partition is arranged between the intermediate beam and the bottom plate;

[0028] The partition separates the two soft-pack battery cell module structures on both sides.

[0029] Further, the partition is a hollow plate with a cavity, and a plurality of laminates are arranged horizontally inside the partition.

[0030] Further, the lower surface of the top plate abuts against the upper surface of the support plate, and the upper surface of the top plate is coplanar with the upper surfaces of the two side beams.

[0031] For the battery pack of the present utility model, by arranging end plates and side beams at the edges of the bottom plate, and arranging a top plate at the top of the end plates and side beams, the top plate, side beams and end plates can cooperate with the bottom plate to form the outer shell structure of the battery pack, and the outer shell structure of the battery pack plays a protective role for the internal soft-pack battery cells and other structures. By directly integrating the bottom plate as the lower shell structure of the battery pack, the utilization rate of the internal space of the battery pack can be improved, and the energy density of the battery pack can be increased.

[0032] In addition, by arranging the side beam as an integral body formed by welding a plurality of unit beams along their own height directions, the height of the side beam can be realized by changing the number of unit beams, so as to be able to adapt to soft-pack battery cells of different sizes, achieving the purpose of improving the assembly convenience.

[0033] Secondly, by arranging intermediate beams between the side beams, a structure with higher mechanical strength, better stability and load-bearing capacity can be formed in cooperation with the side beams and end plates, thereby providing conditions for accommodating more soft-pack battery cells. By setting the soft-pack battery cell modules into two groups and arranging them on both sides of the intermediate beam respectively, the endurance of the battery pack can be significantly improved.

[0034] Furthermore, by arranging a partition between the two soft-pack battery cell modules, on the one hand, the overall mechanical strength and load-bearing capacity of the battery pack can be further increased, making it not easily deformed when subjected to impact and extrusion. On the other hand, the two soft-pack battery cell modules can be separated in different spaces. When any one of the soft-pack battery cell modules undergoes thermal runaway, a relatively stable environment can be provided for the other soft-pack battery cell module, reducing the probability of open fire in the battery pack and achieving the purpose of improving the electrical safety of the battery pack.

[0035] By abutting the top plate against the support plate, the support plate can support the top plate and improve the compressive capacity of the top plate. By setting the top plate and the upper surface of the side beam to be coplanar, the exterior of the battery pack is flat, which is beneficial to reducing the space occupied by the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0037] Figure 1 is a schematic structural diagram of the soft-pack battery cell module structure in the embodiment of the present utility model;

[0038] Figure 2 is a top view of the battery pack in the embodiment of the present utility model;

[0039] Figure 3 is Figure 2 a schematic cross-sectional structure diagram at A-A in

[0040] Figure 4 is Figure 2 a schematic cross-sectional structure diagram at B-B in

[0041] DESCRIPTION OF THE REFERENCE NUMERALS:

[0042] 1, bottom plate;

[0043] 101, unit plate; 102, support rib;

[0044] 2, support plate;

[0045] 201, first installation space; 202, second installation space;

[0046] 3. Soft-pack battery cell; 4. Side beam; 401. Unit beam; 5. End plate; 6. Top plate; 7. Intermediate beam;

[0047] 8. Partition board;

[0048] 801. Laminated board. Detailed implementation manner

[0049] It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other. To more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will describe the specific implementation manners of the present utility model with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other implementation manners can also be obtained.

[0050] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] Taking a soft-pack battery cell module structure and a battery pack described in the present utility model as an example, the orientation terms such as "upper, lower, left, right, front, back" used in the embodiments are defined based on the up and down direction (also known as the height direction, or the Z direction of the battery pack), the left and right direction (also known as the width direction, or the Y direction of the battery pack), and the front and back direction (also known as the length direction, or the X direction of the battery pack) of the battery pack. "Inner" and "outer" are defined based on the contour of the corresponding component. For example, "inner" and "outer" defined based on the contour of the battery pack, the side close to the middle of the battery pack is "inner", and vice versa is "outer".

[0052] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can 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 in combination with specific situations.

[0053] Next, reference will be made to the attachedFigure 1 To the appendix Figure 4 The present utility model will be described in detail in conjunction with the embodiments.

[0054] Embodiment 1

[0055] This embodiment relates to a structure of a soft-pack battery cell module, which can be integrated into the structure of the lower housing of the battery pack as a support structure for the soft-pack battery cell. On the one hand, it can limit and support the soft-pack battery cell and provide protection, avoiding the relatively soft outer shell of the soft-pack battery cell from affecting the overall service life of the battery pack; on the other hand, through a layer structure with a specific structure and capable of being integrated into the lower housing of the battery pack, the utility model has the characteristics of high structural strength, high space utilization rate, low production cost, and easy assembly, so as to achieve the invention purpose of improving the matching degree and applicability of the soft-pack battery cell in the field of power batteries for new energy vehicles.

[0056] In terms of the overall structure, referring to Figure 1 , the structure of the soft-pack battery cell module in this embodiment includes a bottom plate 1, a support plate 2, and a soft-pack battery cell 3. Among them, the support plate 2 is vertically arranged on the bottom plate 1, and the number of the support plates 2 is set to be multiple. The support plates 2 are arranged at equal intervals along the width direction of the bottom plate 1. The space enclosed by two adjacent support plates 2 and the bottom plate 1 is the first installation space 201. The cross-sectional shape of the first installation space 201 is U-shaped. The number of the soft-pack battery cells 3 is set to be multiple. The multiple soft-pack battery cells 3 are respectively arranged in each first installation space 201.

[0057] With the above settings, the support structure composed of the bottom plate 1 and the support plates 2 vertically arranged at equal intervals on the bottom plate 1 has multiple first installation spaces 201 that play a role in limiting and protecting the soft-pack battery cell 3. During the assembly process, the staff installs the soft-pack battery cells 3 in each first installation space 201 respectively. Compared with the existing soft-pack battery cell module structure solution with multiple support parts, the support structure composed of the support plate 2 and the bottom plate 1 in this application is not only simple in structure, low in cost, and easy to assemble, but also can be directly integrated as the lower housing of the battery pack and the battery edge sealing and combing strip structure, so that the battery pack has a higher energy density and space utilization rate. Therefore, the present utility model has the characteristics of high structural strength, high space utilization rate, low production cost, and easy assembly, and can improve the matching degree and applicability of the soft-pack battery cell 3 in the field of power batteries for new energy vehicles.

[0058] Based on the above design concept, specifically, in this embodiment, referring to Figure 1 , the bottom plate 1 includes a plurality of unit plates 101 that are fixedly connected to each other. The unit plate 101 is the smallest structural unit that makes up the bottom plate 1. The number of the unit plates 101 can be multiple. In this embodiment, the number of the unit plates 101 is 2. The side walls of the unit plates 101 are in contact with each other and are fixedly formed into the bottom plate 1 by welding.

[0059] By setting the bottom plate 1 as a whole formed by abutting and welding the side walls of multiple unit plates 101, the overall length of the bottom plate 1 can be adjusted by adjusting the number of unit plates 101, achieving the effects of increasing the optional size of the bottom plate 1 and reducing the difficulty of battery pack design and assembly.

[0060] Refer to Figure 1 , for the purpose of improving the mechanical strength and load-bearing capacity of the bottom plate 1, in this embodiment, the unit plate 101 is a hollow plate with a cavity. The unit plate 101 can be a hollow metal plate made of aluminum alloy. The side walls of two adjacent unit plates 101 abut against each other and are welded to form a support rib 102.

[0061] By setting the bottom plate 1 as a hollow metal plate structure with a cavity, the side walls of two adjacent unit plates 101 abut against each other to form a structure with a support rib 102 that improves the overall structural strength and load-bearing capacity. The support rib 102 makes the bottom plate 1 not easily deformed. At the same time, the unit plate 101 with a hollow structure is lighter in weight, which is beneficial to reducing the weight of the battery pack and even the whole vehicle, meeting the lightweight principle of battery pack design.

[0062] Refer to Figure 1 , for the convenience of installing and setting other devices in the battery pack, in this embodiment, multiple support plates 2 are symmetrically distributed about the geometric center of the bottom plate 1 and arranged at equal intervals. Second installation spaces 202 are reserved between the support plates 2 at the head and tail of the arrangement and the two side edges of the bottom plate 1 in the width direction.

[0063] By reserving the second installation spaces 202 between the head and tail of the support plates 2 and the two side edges of the bottom plate 1 in the width direction, it is convenient to install and set the cooling device and the charge and discharge management device of the battery pack. The form of the support plates 2 being symmetrically distributed about the center of the bottom plate 1 can balance the center of gravity position and make the battery pack have better dynamic stability.

[0064] By setting the partition 8 as a hollow plate with a cavity and arranging multiple horizontal laminates 801 in the cavity, the mechanical strength and anti-deformation ability of the partition 8 can be increased, and the weight of the partition 8 can be reduced, thereby reducing the overall weight of the battery pack.

[0065] Embodiment 2

[0066] This embodiment relates to a battery pack, including a soft-pack battery cell module structure, side beams 4, end plates 5, and a top plate 6 as described in Embodiment 1. Refer to Figure 2 , Figure 3 and Figure 4, the side beams 4 are vertically and fixedly connected to both ends of the bottom plate 1 in the width direction. The end plates 5 are vertically and fixedly connected to both ends of the bottom plate 1 in the length direction. The top plate 6 is fixedly installed on the tops of the side beams 4 and the end plates 5 and is arranged parallel to the bottom plate 1. The top plate 6, the side beams 4 and the end plates 5 cooperate with the bottom plate 1 to enclose the outer shell structure of the battery pack.

[0067] In this embodiment, by arranging the end plates 5 and the side beams 4 at the edges of the bottom plate 1 and arranging the top plate 6 on the tops of the end plates 5 and the side beams 4, the top plate 6, the side beams 4 and the end plates 5 can cooperate with the bottom plate 1 to enclose the outer shell structure of the battery pack, and the outer shell structure of the battery pack plays a protective role for the internal soft-pack battery cells 3 and other structures. By directly integrating the bottom plate 1 as the lower shell structure of the battery pack, the utilization rate of the internal space of the battery pack can be improved, and the energy density of the battery pack can be increased.

[0068] Refer to Figure 2 , Figure 3 and Figure 4 , for the purpose of improving the assembly convenience, in this embodiment, the side beam 4 is composed of a plurality of unit beams 401 stacked and welded along its own height direction.

[0069] By setting the side beam 4 as an integral body composed of a plurality of unit beams 401 welded along its own height direction, the height of the side beam 4 can be achieved by changing the number of unit beams 401, so as to be able to adapt to different sizes of soft-pack battery cells 3, achieving the purpose of improving the assembly convenience.

[0070] Refer to Figure 2 and Figure 4 , in order to improve the structural strength and endurance of the battery pack, in this embodiment, an intermediate beam 7 is vertically connected at the middle position between the two side beams 4. The number of soft-pack battery cell module structures is two groups and they are respectively arranged on both sides of the intermediate beam 7. The intermediate beam 7 can be a square beam made of aluminum alloy.

[0071] By arranging the intermediate beam 7 between the side beams 4, a structure with higher mechanical strength, better stability and stronger load-bearing capacity can be formed in cooperation with the side beams 4 and the end plates 5, thus providing conditions for accommodating more soft-pack battery cells 3. By setting the soft-pack battery cell module structures as two groups and respectively arranging them on both sides of the intermediate beam 7, the endurance of the battery pack can be significantly improved.

[0072] Refer to Figure 4 , for the purpose of improving the electrical safety of the battery pack, in this embodiment, a partition 8 is arranged between the intermediate beam 7 and the bottom plate 1. The partition 8 can be a rectangular metal plate made of aluminum alloy. The partition 8 vertically connected between the intermediate beam 7 and the bottom plate 1 separates the soft-pack battery cell module structures on both sides of the intermediate beam 7 on both sides.

[0073] By arranging a partition plate 8 between two pouch cell module structures, on the one hand, it can further increase the overall mechanical strength and load-bearing capacity of the battery pack, making it not easily deformed when subjected to impacts and squeezes. On the other hand, it can separate the two pouch cell module structures in different spaces. When any one of the pouch cell module structures undergoes thermal runaway, it provides a relatively stable environment for the other pouch cell module structure, reducing the probability of open flames appearing in the battery pack and achieving the purpose of improving the electrical safety of the battery pack.

[0074] Referring to Figure 4 , in order to improve the structural strength of the partition plate 8, in this embodiment, the partition plate 8 is a hollow plate with a cavity, and a plurality of laminates 801 are arranged horizontally in the cavity of the partition plate 8. The laminates 801 are made of the same material as the partition plate 8.

[0075] By setting the partition plate 8 as a hollow plate with a cavity and arranging a plurality of horizontal laminates 801 in the cavity, it can increase the mechanical strength and anti-deformation ability of the partition plate 8, and reduce the weight of the partition plate 8, thereby reducing the overall weight of the battery pack.

[0076] Referring to Figure 3 and Figure 4 , for the purpose of reducing the space occupied by the battery pack, in this embodiment, the lower surface of the top plate 6 abuts against the upper surface of the support plate 2, and the upper surface of the top plate 6 is coplanar with the upper surfaces of the two side beams 4.

[0077] By abutting the top plate 6 against the support plate 2, the support plate 2 can support the top plate 6 and improve the compressive capacity of the top plate 6. By setting the upper surface of the top plate 6 to be coplanar with the upper surfaces of the side beams 4, the exterior of the battery pack is made flat, which is beneficial to reducing the space occupied by the battery pack.

[0078] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A soft-pack battery cell module structure, characterized in that: It includes a bottom plate; Support plates, vertically arranged on the upper surface of the bottom plate and constructed as a plurality of parallelly arranged at equal intervals along the width direction of the bottom plate. Two adjacent support plates and the bottom plate enclose a first installation space; Soft-pack battery cells, constructed as a plurality arranged in a plurality of the first installation spaces.

2. The soft-pack battery cell module structure according to claim 1, characterized in that: The bottom plate includes a plurality of unit plates fixedly connected to each other.

3. The soft-pack battery cell module structure according to claim 2, characterized in that: The unit plate is a hollow plate with a cavity, and the side walls of two adjacent unit plates form a support rib.

4. The soft-pack battery cell module structure according to claim 1, characterized in that: A plurality of the support plates are symmetrically distributed about the geometric center of the bottom plate, and second installation spaces are reserved between the support plates at the head and tail ends and the two side edges in the width direction of the bottom plate.

5. A battery pack, characterized in that: It includes a soft-pack battery cell module structure, adopting the soft-pack battery cell module structure according to any one of claims 1 to 4; Side beams, symmetrically and vertically arranged at both ends in the width direction of the bottom plate; End plates, symmetrically and vertically arranged at both ends in the length direction of the bottom plate; A top plate, arranged on the tops of the side beams and the end plates and parallel to the bottom plate.

6. The battery pack according to claim 5, characterized in that: The side beam includes a plurality of unit beams; A plurality of the unit beams are stacked along their own height directions to form the side beam.

7. The battery pack according to claim 5, characterized in that: An intermediate beam is vertically connected at the middle position between the two side beams; The number of the soft-pack battery cell module structures is two groups, and they are respectively located on both sides of the intermediate beam.

8. The battery pack according to claim 7, characterized in that: A partition is arranged between the intermediate beam and the bottom plate; The partition separates the two soft-pack battery cell module structures on both sides.

9. The battery pack according to claim 8, characterized in that: The partition is a hollow plate with a cavity, and a plurality of layer plates are arranged horizontally in the partition.

10. The battery pack according to claim 7, characterized in that: The lower surface of the top plate abuts against the upper surface of the support plate, and the upper surface of the top plate is coplanar with the upper surfaces of the two side beams.

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