Module structure and battery pack

Abstract

The utility model provides a module structure and a battery pack. The module structure comprises a plurality of partition plates and battery cell units, wherein the partition plates are arranged in parallel at intervals; each battery cell unit is arranged between every two adjacent partition plates; each battery cell unit comprises a plurality of battery cells which are arranged in parallel, two sides of each battery cell are connected with the partition plates on the same side in a bonding manner, and all the battery cell units are connected together through the partition plates. According to the module structure disclosed by the utility model, the battery cell units are arranged between the two adjacent partition plates, and the two sides of the battery cells in the battery cell units are bonded and connected with the partition plates on the same sides, so that all the battery cell units can be connected together through a plurality of partition plates, and the grouping efficiency of the module structure is improved; and the specification of the module structure can be increased, so that a separation beam on a traditional lower shell can be eliminated, and the production cost of the module structure can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a module structure. At the same time, the utility model also relates to a battery pack provided with the module structure. Background Art

[0002] With the promotion and application of power batteries, people have higher and higher requirements for the performance of battery packs in power batteries. As the main component of the battery pack, the performance of the battery module directly affects the battery pack. Traditional battery modules usually include two end plates arranged opposite to each other, multiple battery cells arranged side by side between the two end plates, and then tied together with cable ties. However, the structural form of this traditional module has a complicated assembly process and small specifications. When arranging in the battery pack, it is necessary to set horizontal and vertical partition beams on the lower shell of the battery pack, and install the battery modules in the installation space defined by multiple partition beams. It is not only not conducive to improving the production efficiency of the battery pack, but also not conducive to improving the energy density of the battery pack. Utility Model Content

[0003] In view of this, the utility model aims to propose a method to improve the assembly effect and the energy density of the battery pack.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A module structure comprises a plurality of partitions arranged in parallel and at intervals, and a battery cell unit arranged between two adjacent partitions;

[0006] Each of the battery cell units includes a plurality of battery cells arranged in parallel, both sides of each of the battery cells are bonded and connected to the partition on the same side, and all of the battery cell units are connected together through the partition.

[0007] Furthermore, it also includes an end plate disposed between the same ends of at least two adjacent partitions;

[0008] The end plate is bonded and connected to the corresponding partition plate and / or the battery core.

[0009] Furthermore, the outer side surface of the end plate is provided with a clamping groove for clamping by an external clamping device; and / or,

[0010] The outer side surface of the end plate is provided with a plurality of weight-reducing grooves.

[0011] Further, the battery core is bonded to the separator by structural adhesive; and / or,

[0012] The partition is a heat insulation board.

[0013] Furthermore, a cooling channel is provided in the partition.

[0014] Furthermore, the battery cell unit is coated with an insulating film, and both sides of each battery cell are bonded and connected to the separator through the insulating film.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The module structure described in the utility model can connect all the battery cell units together through multiple partitions by arranging a battery cell unit between two adjacent partitions, and both sides of the battery cell in the battery cell unit are bonded and connected to the partition on the same side, which not only helps to improve the grouping efficiency of the module structure, but also helps to increase the specifications of the module structure, and further helps to eliminate the partition beam on the traditional lower shell, thereby helping to reduce the production cost of the module structure.

[0017] In addition, by providing the end plate, the structural strength of the module can be improved in cooperation with the partition, and the end plate and the partition and / or the battery cell are bonded and connected, which is conducive to improving the installation convenience of the end plate. By providing the clamping groove on the end plate, it is convenient for the external clamping device to clamp the module structure, thereby facilitating the transfer of the module structure; the provision of the weight-reducing groove on the end plate is also conducive to further reducing the weight of the module structure, thereby facilitating the lightweighting of the module structure.

[0018] In addition, the battery cell is bonded to the partition by structural adhesive, which is easy to implement and has high connection strength; the partition is a heat insulation board, which is conducive to preventing the battery cell from affecting the adjacent battery cell when thermal runaway occurs, thereby improving safety. A cooling channel is set in the partition to facilitate the cooling of the battery cell. By coating the battery cell with insulating film, the two sides of the battery cell are bonded to the partition through the insulating film, which is conducive to further improving the connection strength and reliability between the battery cell and the partition.

[0019] In addition, another object of the utility model is to provide a battery pack, comprising a lower shell having an installation cavity, a base plate connected to the bottom of the installation cavity, and the module structure as described above, and the bottom of the battery cell unit in the module structure is adhesively connected to the base plate.

[0020] Furthermore, the bottom plate is connected to the bottom of each of the battery cells by bonding with a thermally conductive adhesive; and / or,

[0021] The bottom of the partition is bonded and connected to the bottom plate.

[0022] Furthermore, the top of the battery cell is lower than the top surface of the mounting cavity.

[0023] Furthermore, the base plate is a liquid cooling plate.

[0024] The battery pack described in the utility model, by providing the module structure as described above, and the bottom of each battery cell unit is bonded and connected to the bottom plate, is not only conducive to simplifying the assembly process of the battery pack and improving the rigidity of the battery pack, but also conducive to eliminating the partition beam on the lower shell body, thereby facilitating the improvement of the energy density of the battery pack, and further facilitating the improvement of the electrical performance of the battery pack, while also facilitating the overall strength of the battery pack.

[0025] Secondly, the bottom plate is bonded to the bottom of each battery cell by heat-conducting adhesive, which is conducive to improving the cooling effect of the bottom plate on each battery cell. The bottom of the partition is also bonded to the bottom plate, which is conducive to further improving the connection firmness of the module structure on the lower shell. The top of the battery cell is lower than the top surface of the installation cavity, and the inner wall of the installation cavity can be used to resist the cyclic expansion force of the battery cell, thereby improving the electrical performance of the module structure. The bottom plate is a liquid cooling plate, which is conducive to improving the cooling effect of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of the structure of the module structure and the lower housing according to the first embodiment of the present utility model in a partially disassembled state;

[0028] Figure 2 It is a structural schematic diagram of the module structure and the lower housing according to the first embodiment of the present utility model in a partially assembled state from one perspective;

[0029] Figure 3 It is a structural schematic diagram of the module structure and the lower housing according to the first embodiment of the present utility model in another perspective when they are partially assembled;

[0030] Figure 4 This is a schematic structural diagram of the end plate described in Example 1 of the utility model.

[0031] Description of reference numerals:

[0032] 1. Battery cell; 2. Partition plate; 3. Lower shell; 4. End plate;

[0033] 100, battery cell unit; 201, adhesive layer; 301, liquid cooling plate; 401, clamping groove; 402, weight reduction groove. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0035] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0037] Embodiment 1

[0038] This embodiment relates to a module structure, which aims to improve assembly efficiency and energy density of a battery pack by optimizing its own structure.

[0039] In terms of overall composition, Figures 1 to 3 As shown in , the module structure includes a plurality of partitions 2 arranged in parallel and at intervals, and a battery cell unit 100 disposed between two adjacent partitions 2. Each battery cell unit 100 includes a plurality of battery cells 1 arranged in parallel, and both sides of each battery cell 1 are bonded and connected to the partition 2 on the same side, and all battery cell units 100 are connected together through the partition 2.

[0040] The module structure of this embodiment is such that a battery cell unit 100 is arranged between two adjacent partitions 2, and both sides of the battery cell 1 in the battery cell unit 100 are bonded and connected to the partition 2 on the same side. Thus, all the battery cell units 100 can be connected together through multiple partitions 2, which not only helps to improve the grouping efficiency of the module structure, but also helps to increase the specifications of the module structure, and further helps to eliminate the partition beam on the traditional lower shell 3, thereby helping to reduce the production cost of the module structure.

[0041] In terms of specific structure, the battery cell 1 in this embodiment can be Figure 1 The short blade battery cell 1 shown in the figure can have a length of 100 mm to 300 mm, for example, the length of the battery cell 1 can be 100 mm, 200 mm or 300 mm. In specific implementation, the pole and explosion-proof valve of the battery cell 1 are both set upward. Of course, the specific specifications of the battery cell 1 and the direction of the explosion-proof valve can be determined according to the use requirements.

[0042] In the present embodiment, the battery cells 1 in each battery cell unit 100 are stacked in a non-grouping force manner. For example, an air gap is designed between two adjacent battery cells 1, or a buffer material with a heat insulating effect in the prior art is bonded between two adjacent battery cells 1 to resist the expansion force between the battery cells 1, thereby improving the performance of the battery cells 1.

[0043] As a preferred embodiment, the module structure in this embodiment further includes an end plate 4 disposed between the same ends of at least two adjacent partitions 2. Figure 1 and Figure 4 As shown in , the end plates 4 in this embodiment are respectively connected to the same end of three adjacent partitions 2, that is, between the two ends of two battery cell units 100. By providing the end plates 4, the structural strength of the module can be improved in cooperation with the partitions 2. The end plates 4 are bonded and connected to the partitions 2 and / or the battery cells 1, which is conducive to improving the installation convenience of the end plates 4. In particular, a more solid mesh structure can be formed by the cooperation of multiple partitions 2 and the end plates 4, thereby having better structural reliability.

[0044] Furthermore, the end plate 4 is bonded and connected to the corresponding partition 2 and the battery cell 1. This is conducive to improving the connection strength of the end plate 4, and then to improving the strength of the module structure. Of course, it is also feasible that the end plate 4 is connected to only one of the battery cell 1 and the partition 2. Of course, when it is implemented, the number of partitions 2 connected to the end plate 4 can be adaptively increased or decreased according to the use requirements in addition to the three shown in the figure.

[0045] In addition, in this embodiment, an insulating film is coated on the outside of each battery cell unit 100, and both sides of each battery cell 1 are bonded to the partition 2 through the insulating film. By coating the insulating film on the outside of the battery cell unit 100, the two sides of the battery cell 1 are bonded to the partition 2 through the insulating film, which is conducive to further improving the connection strength and reliability of the battery cell unit 100 and the partition 2. In specific implementation, the insulating film can be a film body with good insulation performance such as a blue film that can be bonded to the outside of the battery cell unit 100.

[0046] Preferably, the partition 2 in this embodiment is a heat insulation board, which is beneficial to prevent the battery cell unit 100 from affecting the adjacent battery cell unit 100 when thermal runaway occurs, thereby improving safety. For example, the partition 2 in this embodiment can be made of an epoxy board, which has good thermal insulation performance and is easy to arrange and implement. In addition, in this embodiment, a cooling channel can be set in the partition 2 to further improve the cooling effect on the battery cell.

[0047] In specific implementation, the structural strength of the partition 2 is 7-10 MPa, which is conducive to preventing the partition 2 from deforming during use, thereby improving the reliability of the module structure. For example, the structural strength of the partition 2 is 7 MPa, 8 MPa, 9 MPa, 9.5 MPa or 10 MPa.

[0048] The battery cell 1 in this embodiment is bonded to the partition 2 by structural adhesive to facilitate implementation and have good connection strength. In specific implementation, a glue layer 201 composed of structural adhesive is applied on the side of the partition 2 facing the battery cell unit 100, and the side of the battery cell 1 is directly bonded to the glue layer 201. Of course, when the insulating film is provided, the side of the insulating film is bonded to the glue layer 201. The end plate 4 can be connected to the partition 2 and the battery cell unit 100 by double-sided adhesive or structural adhesive.

[0049] Considering that the partition 2 in this embodiment is bonded to the battery cell unit 100 and the end plate 4 to form a module structure, it needs to be transferred. Figure 4 As shown in , the outer side of the end plate 4 is provided with a clamping groove 401 for clamping by an external clamping device. The number of the clamping grooves 401 can match the number of clamping structures on the clamping device, thereby improving the clamping effect on the module structure.

[0050] In addition, a plurality of weight-reducing grooves 402 are provided on the outer side of the end plate 4. Figure 4 As shown in , the weight-reducing grooves 402 are respectively arranged on both sides of the clamping groove 401, and are arranged in a plurality of intervals along the height direction of the end plate 4. The weight-reducing grooves 402 arranged on the end plate 4 are also conducive to further reducing the weight of the module structure, thereby facilitating the lightweighting of the module structure.

[0051] The module structure in this embodiment can determine the specifications of the partition 2, the battery cell unit 100 and the end plate 4 according to the use requirements. The module structure can be made to match the module installation space on the lower shell 3. In this case, the partition beam on the lower shell 3 can be eliminated, and the module structure can be directly set on the lower shell 3, which is conducive to improving the energy density inside the battery pack. In addition, the module structure is simple in structure and easy to assemble, which is conducive to improving the assembly efficiency, and then to improving the production efficiency of the battery pack.

[0052] Embodiment 2

[0053] The present embodiment relates to a battery pack, comprising a lower shell 3 having a mounting cavity, a bottom plate connected to the bottom of the mounting cavity, and the module structure in the first embodiment, wherein the bottom of the battery cell unit 100 in the module structure is bonded to the bottom plate.

[0054] The battery pack of this embodiment is provided with the module structure as above, and the bottom of each battery cell unit 100 is bonded and connected to the bottom plate, which not only helps to simplify the assembly process of the battery pack and improve the rigidity of the battery pack, but also helps to eliminate the partition beam on the lower shell 3, thereby helping to improve the energy density of the battery pack, and further helping to improve the electrical performance of the battery pack.

[0055] In terms of specific structure, Figures 1 to 3As shown in , one end of the installation cavity is used to install electrical components, and the other part of the installation cavity is used to install battery modules. In this embodiment, the bottom plate is a liquid cooling plate 301. Specifically, the lower shell includes a frame with a hollow interior, a bottom guard plate used to block the open bottom of the frame, and the liquid cooling plate 301 is arranged above the bottom guard plate, and the bottom of each battery cell unit is bonded and connected to the liquid cooling plate 301. Among them, the liquid cooling plate 301 constitutes the bottom surface of the installation cavity, and the module structure is integrally located on the liquid cooling plate 301. At this time, there is no need to set a partition beam in the installation cavity, and the partition 2 in the module structure can also play the role of a partition beam.

[0056] As a preferred embodiment, the liquid cooling plate 301 is bonded to the bottom of each battery cell 1 by a thermally conductive adhesive, which is beneficial to improving the cooling effect of the liquid cooling plate 301 on each battery cell 1. In addition, the bottom of the partition 2 is bonded to the liquid cooling plate 301, and such a setting is beneficial to further improve the connection firmness of the module structure on the lower shell 3. In this embodiment, the bonding strength between the bottom of the partition 2 and the liquid cooling plate 301 is greater than the bonding strength between the partition 2 and the battery cell 1. Such a setting improves the rigidity of the battery pack and the mode of the whole pack, and avoids resonance between the battery pack and the whole vehicle.

[0057] Furthermore, in this embodiment, the top of the battery cell 1 is lower than the top surface of the installation cavity. This arrangement can use the inner wall of the installation cavity to resist the cyclic expansion force of the battery cell 1, thereby improving the electrical performance of the module structure.

[0058] The battery pack in this embodiment, by providing the above module structure and eliminating the partition beam solution, is beneficial to increasing the space inside the battery pack, and further helps to improve the energy density and electrical performance of the battery pack.

[0059] In addition, the present embodiment also relates to an energy storage device, in which the above battery pack is provided.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A module structure, characterized in that: It comprises a plurality of partitions arranged in parallel and at intervals, and a battery cell unit arranged between two adjacent partitions; Each of the battery cell units includes a plurality of battery cells arranged in parallel, both sides of each of the battery cells are bonded and connected to the partition on the same side, and all of the battery cell units are connected together through the partition.

2. The module structure according to claim 1, characterized in that: Also includes an end plate disposed between the same ends of at least two adjacent partitions; The end plate is bonded and connected to the corresponding partition plate and / or the battery core.

3. The module structure according to claim 2, characterized in that: The outer side surface of the end plate is provided with a clamping groove for clamping by an external clamping device; and / or, The outer side surface of the end plate is provided with a plurality of weight-reducing grooves.

4. The module structure according to claim 1, characterized in that: The battery core is bonded to the separator by structural adhesive; and / or, The partition is a heat insulation board.

5. The module structure according to claim 1, characterized in that: A cooling channel is arranged in the partition.

6. The module structure according to any one of claims 1 to 5, characterized in that: The battery cell unit is coated with an insulating film, and both sides of each battery cell are bonded and connected to the separator through the insulating film.

7. A battery pack, characterized in that: It comprises a lower shell having an installation cavity, a base plate connected to the bottom of the installation cavity, and the module structure according to any one of claims 1 to 6, wherein the bottom of the battery cell unit in the module structure is bonded to the base plate.

8. The battery pack according to claim 7, characterized in that: The bottom plate is connected to the bottom of each battery cell by bonding with a thermally conductive adhesive; and / or, The bottom of the partition is bonded and connected to the bottom plate.

9. The battery pack according to claim 7, characterized in that: The top of the battery core is lower than the top surface of the installation cavity.

10. The battery pack according to claim 7, characterized in that: The bottom plate is a liquid cooling plate.

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