Battery module and battery pack

Abstract

The utility model relates to the technical field of power batteries, and provides a battery module and a battery pack. The battery module comprises a plurality of battery cell assemblies which are arranged side by side, and each battery cell assembly comprises a plurality of battery cells which are stacked in sequence; the first heat insulation part is arranged between the two adjacent battery core assemblies so as to block heat transfer between the two adjacent battery core assemblies; and the second heat insulation part is arranged on the side surface of the battery module so as to block heat transfer between the battery module and the outside. According to the battery module, the use safety of the battery pack can be improved, and the use quality of the battery pack can be improved.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery module. This utility model also relates to a battery pack equipped with the above-mentioned battery module. Background Technology

[0002] With the development of new energy vehicles, the performance and safety of new energy battery packs, as the core power unit of vehicles, have become the focus of industry attention. Battery packs are composed of a large number of individual cells or modules tightly combined. Due to adverse factors such as internal short circuits, overcharging and over-discharging, and high-temperature environments, individual cells or modules are prone to thermal runaway.

[0003] Once thermal runaway is triggered, a series of violent chemical reactions occur within the battery cell or module, releasing a large amount of heat in a very short time, causing the temperature to rise sharply. Given the compact internal space of the battery pack, heat can be rapidly conducted to adjacent cells or modules. If effective heat dissipation measures are not taken in time or the heat is not effectively contained, thermal runaway will spread rapidly within the battery pack, potentially leading to serious accidents such as fires or even explosions. This not only poses a direct threat to the lives and property of new energy vehicle users but also significantly reduces the safety of the battery module. Furthermore, thermal runaway also negatively impacts the stability, reliability, and lifespan of the battery pack, hindering its overall performance. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery module to improve the performance of battery packs.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A battery module includes: multiple cell assemblies arranged side by side, each of the cell assemblies including multiple cells stacked sequentially;

[0007] The first heat insulation part is disposed between two adjacent battery cell assemblies to block heat transfer between the two adjacent battery cell assemblies.

[0008] The second heat insulation part is provided on the side of the battery module to block heat transfer between the battery module and the outside world.

[0009] Furthermore, the number of battery cells stacked in each of the battery cell assemblies is the same, and the first heat insulation part includes a plurality of first heat insulation plates disposed corresponding to the battery cells in the battery cell assembly, with each first heat insulation plate attached to the side of the corresponding battery cell.

[0010] Furthermore, the first heat insulation plate is made of ceramicized silicone rubber.

[0011] Furthermore, the thickness of the first heat insulation board is between 2mm and 3mm.

[0012] Furthermore, in the stacking direction of the battery cells, the ratio of the width of the first heat insulation plate to the thickness of the battery cell is between 0.85 and 0.95.

[0013] Furthermore, the second heat insulation portion includes a second heat insulation plate attached to the side of the battery module.

[0014] Furthermore, the second heat insulation panel is made of aerogel felt.

[0015] Furthermore, in the stacking direction of the battery cells, the ratio of the width of the second heat insulation plate to the height of the battery cell is between 0.85 and 0.95; and / or, the thickness of the second heat insulation plate is between 1 mm and 2 mm.

[0016] Furthermore, a first adhesive layer is provided between the first heat insulation part and the cells on both sides; and / or, a second adhesive layer is provided between the second heat insulation part and the side of the battery module.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] The battery module described in this utility model effectively blocks heat transfer between adjacent cell assemblies and between the battery module and the outside environment by setting a first heat insulation part and a second heat insulation part between multiple cell assemblies arranged side by side. In the event of thermal runaway, it can effectively block the transmission of thermal runaway, thereby helping to prevent the occurrence of heat propagation, improving the safety of the battery module and thus helping to improve the quality of the battery pack.

[0019] Furthermore, the first heat insulation section includes multiple first heat insulation plates corresponding to the battery cells, with each first heat insulation plate attached to the side of the battery cell. This arrangement of the first heat insulation plates at intervals ensures that the plates attached to the sides of the battery cells are less prone to deformation when the battery module is pre-loaded into the casing, thus helping to maintain the barrier effect of the first heat insulation section and facilitating design implementation. The first heat insulation plates are made of ceramicized silicone rubber, which, in addition to providing good heat insulation, also has a certain degree of deformation capability, facilitating the application of casing force when the battery module is loaded into the casing and further facilitating design implementation. The thickness of the first heat insulation plates is between 2mm and 3mm, which helps control the volume of the battery module and facilitates design implementation. The ratio of the width of the first heat insulation plate to the thickness of the battery cell is between 0.85 and 0.95, which facilitates the arrangement of the first heat insulation plates on the battery cell and further aids in design implementation.

[0020] Furthermore, the second heat insulation component attached to the side of the battery module effectively blocks heat transfer between the battery module and the external environment, facilitating design implementation. The use of aerogel felt for the second heat insulation board ensures effective heat insulation and allows for lightweight battery module design. Maintaining a width-to-cell height ratio of 0.85-0.95 facilitates the placement of the second heat insulation board on the side of the battery module, aiding design implementation. A thickness of 1mm-2mm for the second heat insulation board helps control the battery module's volume, further facilitating design implementation. The first adhesive layer facilitates the placement of the first heat insulation component on the cell, and the second adhesive layer facilitates the placement of the second heat insulation component on the battery module, further aiding design implementation.

[0021] This utility model also proposes a battery pack, wherein the battery pack is provided with the battery module as described above.

[0022] The battery pack described in this utility model and the battery module described above have the same beneficial effects as the prior art, so they will not be described again here. Attached Figure Description

[0023] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0024] Figure 1 This is an exploded view of the battery module described in an embodiment of the present invention;

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Battery cell assembly;

[0027] 101. Battery cell;

[0028] 2. First heat insulation section;

[0029] 201. First heat insulation board;

[0030] 3. Second heat insulation section;

[0031] 301. Second heat insulation board. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0033] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0034] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

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

[0037] Example 1

[0038] This embodiment relates to a battery module, which aims to improve the safety of battery module use and enhance the quality of battery pack use by optimizing the structure of the battery module.

[0039] In terms of overall structure, combined Figure 1 As shown, the battery module in this embodiment includes a cell assembly 1, a first heat insulation part 2, and a second heat insulation part 3. The cell assemblies 1 are multiple units arranged side by side, and each cell assembly 1 includes multiple cells 101 stacked sequentially. The first heat insulation part 2 is disposed between two adjacent cell assemblies 1 to block heat transfer between the two cell assemblies 1. The second heat insulation part 3 is disposed on the side of the battery module to block heat transfer between the battery module and the outside.

[0040] As described above, the battery module in this embodiment effectively blocks heat transfer between adjacent cell assemblies 1 and between the first heat insulation part 2 and the second heat insulation part 3 arranged side by side. In the event of thermal runaway, it can effectively block the transmission of thermal runaway and help prevent the spread of heat, thereby improving the safety of the battery module and enhancing the quality of the battery pack.

[0041] Specifically, in order to better adapt to the battery module's loading operation, as a preferred exemplary structure, in this embodiment, the number of stacked cells 101 in each cell assembly 1 of the battery module is the same. The first heat insulation part 2 includes a plurality of first heat insulation plates 201 corresponding to the cells 101 in the cell assembly 1. Each first heat insulation plate 201 is attached to the side of the corresponding cell 101, so that the first heat insulation part 2 includes a plurality of first heat insulation plates 201 corresponding to the cells 101, and each first heat insulation plate 201 is attached to the side of the cell 101, so that the first heat insulation plates 201 are arranged in a spaced manner. When the battery module is loaded into the box with a pre-applied packing force, the first heat insulation plates 201 attached to the side of the cells 101 are not easily deformed, which helps to ensure the barrier effect of the first heat insulation part 2 and facilitates design and implementation.

[0042] More specifically, in this embodiment, the first heat insulation plate 201 can be made of ceramicized silicone rubber, which, in addition to providing good heat insulation, also has a certain degree of deformation capability, facilitating the application of assembly force when the battery module is placed in the box, thus aiding in design and implementation. Of course, the first heat insulation plate 201 can also be made of other materials with properties similar to ceramicized silicone rubber in the prior art.

[0043] To better attach the first heat insulation plate 201 to the battery cell 101, the thickness of the first heat insulation plate 201 in this embodiment is between 2mm and 3mm. For example, it can be 2mm in this embodiment to reduce the cost of the first heat insulation plate 201. Of course, the thickness of the first heat insulation plate 201 can also be 2.1mm, 2.2mm, 2.3mm, 2.5mm, 2.7mm, 2.9mm, or 3mm, as long as the first heat insulation plate 201 can block the heat transfer between adjacent battery cell assemblies 1. Making the thickness of the first heat insulation plate 201 between 2mm and 3mm is beneficial for controlling the volume of the battery module and helps with design and implementation.

[0044] Specifically, to facilitate the arrangement of the first heat insulation plate 201 on the battery cell 101, in this embodiment, the ratio of the width of the first heat insulation plate 201 to the thickness of the battery cell 101 in the stacking direction of the battery cell 101 is between 0.85 and 0.95. In this embodiment, it can be 0.9, or it can be 0.85, 0.86, 0.87, 0.91, or 0.95, as long as it can be attached to the battery cell 101 and can block heat transfer between adjacent battery cell assemblies 1. Making the ratio of the width of the first heat insulation plate 201 to the thickness of the battery cell 101 between 0.85 and 0.95 is beneficial for the arrangement of the first heat insulation plate 201 on the battery cell 101 and helps with design and implementation.

[0045] It is worth mentioning that in this embodiment, the large surfaces of the battery cells 101 in the battery cell assembly 1 are arranged opposite each other. Therefore, the thickness of the battery cell 101 refers to the distance between the two large surfaces on the same battery cell 101 when viewed along the stacking direction of the battery cells 101, and the height of the battery cell 101 refers to the distance between the bottom and top of the battery cell 101 when viewed along the stacking direction of the battery cells 101.

[0046] In order to better block the heat transfer from the battery module to the outside, the second heat insulation part 3 in this embodiment includes a second heat insulation plate 301 attached to the side of the battery module. The setting of the second heat insulation part 3 attached to the side of the battery module is conducive to blocking the heat transfer between the battery module and the outside, which is conducive to design and implementation.

[0047] Specifically, in this embodiment, the second heat insulation plate 301 can be made of aerogel felt, which helps to ensure the barrier effect and facilitates the lightweight design of the battery module. Of course, in this embodiment, the second heat insulation plate 301 can also be made of other materials with similar properties to aerogel felt in the prior art.

[0048] More specifically, in order to better arrange the second heat insulation plate 301, in this embodiment, the ratio of the width of the second heat insulation plate 301 to the height of the cell 101 in the stacking direction of the battery module is between 0.85 and 0.95. In this embodiment, it can be 0.9 for example, but it can also be 0.85, 0.86, 0.87, 0.91, or 0.95, as long as it can be attached to the battery module and can block heat transfer between the battery module and the outside world. Making the ratio of the width of the second heat insulation plate 301 to the height of the cell 101 between 0.85 and 0.95 is beneficial to the arrangement of the second heat insulation plate 301 on the side of the battery module and helps with the design and implementation.

[0049] To better accommodate the battery module within the battery pack, the thickness of the second heat insulation plate 301 in this embodiment is between 1mm and 2mm. For example, it can be 1mm in this embodiment. Of course, the thickness of the first heat insulation plate 201 can also be 1.1mm, 1.2mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, or 2mm, as long as it can block heat transfer between the battery module and the outside environment. This ensures that the thickness of the second heat insulation plate 301 is between 1mm and 2mm, which helps control the volume of the battery module and facilitates design and implementation.

[0050] In this embodiment, in order to better arrange the first heat insulation part 2 and the second heat insulation part 3 in the battery module, a first adhesive layer is provided between the first heat insulation part 2 and the cells 101 on both sides, and a second adhesive layer is provided between the second heat insulation part 3 and the side of the battery module. The first adhesive layer facilitates the arrangement of the first heat insulation part 2 on the cell 101, and the second adhesive layer facilitates the arrangement of the second heat insulation part 3 on the battery module, which is beneficial to design and implementation.

[0051] Specifically, in this embodiment, both the first adhesive layer and the second adhesive layer can be double-sided tape with a thickness of 0.05 mm, so as to arrange the first heat insulation part 2 and the second heat insulation part 3 in the battery module. Of course, the thickness of the double-sided tape can also be 0.22 mm, as well as other adhesive materials in the prior art that can achieve the same effect, as long as they can arrange the first heat insulation part 2 and the second heat insulation part 3 in the battery module.

[0052] In this embodiment, during battery module assembly, the first heat insulation plate 201 is first bonded to both sides with the first adhesive layer. Then, the first heat insulation plate 201 is attached to the side of the battery cell 101 corresponding to the position of the battery cell 101 in the battery cell assembly 1. The battery cell assemblies 1 are then stacked sequentially to form a battery module, and a second heat insulation plate 301 is attached to the side of the battery module. In this embodiment, when the battery module is pre-loaded into the battery pack with assembly force applied, the battery module without the second heat insulation plate 301 attached can be first installed into the lower housing of the battery pack, and then the second heat insulation plate 301 can be attached to the side of the battery module.

[0053] In this embodiment, the battery module effectively blocks heat transfer between adjacent cell assemblies 1 and between the battery module and the outside environment by setting a first heat insulation part 2 and a second heat insulation part 3 between multiple cell assemblies 1 arranged side by side. In the event of thermal runaway, it can effectively block the transmission of thermal runaway, thereby helping to prevent the occurrence of heat propagation, improving the safety of the battery module and thus helping to improve the quality of the battery pack.

[0054] Example 2

[0055] This embodiment relates to a battery pack, which includes the battery module described in Embodiment 1.

[0056] The battery pack in this embodiment, through the battery module setup in Embodiment 1, effectively blocks heat transfer between adjacent battery cell assemblies 1 and between the battery module and the outside environment by setting a first heat insulation part 2 and a second heat insulation part 3 between multiple battery cell assemblies 1 arranged side by side. In the event of thermal runaway, it can effectively block the transmission of thermal runaway, thereby helping to prevent the occurrence of heat propagation, improving the safety of the battery module and thus improving the quality of the battery pack.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery module, characterized by, The battery module comprises: a plurality of battery cell assemblies arranged side by side, each of the battery cell assemblies comprising a plurality of battery cells stacked in sequence; a first thermal insulation part arranged between two adjacent battery cell assemblies to block heat transfer between the two adjacent battery cell assemblies; a second thermal insulation part arranged on a side surface of the battery module to block heat transfer between the battery module and the outside.

2. The battery module according to claim 1, wherein: the number of battery cells stacked in each of the battery cell assemblies is the same, and the first thermal insulation part comprises a plurality of first thermal insulation plates arranged corresponding to the battery cells in the battery cell assemblies, each of the first thermal insulation plates being attached to a side surface of a corresponding battery cell.

3. The battery module according to claim 2, wherein: the first thermal insulation plates are made of ceramicized silicone rubber.

4. The battery module according to claim 2, wherein: the thickness of the first thermal insulation plates is between 2 mm and 3 mm.

5. The battery module according to claim 2, wherein: in the stacking direction of the battery cells, the ratio of the width of the first thermal insulation plates to the thickness of the battery cells is between 0.85 and 0.

95.

6. The battery module according to claim 1, wherein: the second thermal insulation part comprises a second thermal insulation plate attached to the side surface of the battery module.

7. The battery module according to claim 6, wherein: the second thermal insulation plate is made of aerogel felt.

8. The battery module according to claim 7, wherein: in the stacking direction of the battery cells, the ratio of the width of the second thermal insulation plate to the height of the battery cells is between 0.85 and 0.95; and / or, the thickness of the second thermal insulation plate is between 1 mm and 2 mm.

9. The battery module according to any one of claims 1-8, wherein: a first adhesive layer is arranged between the first thermal insulation part and the battery cells on both sides; and / or, a second adhesive layer is arranged between the second thermal insulation part and the side surface of the battery module.

10. A battery pack, comprising: the battery pack comprises the battery module according to any one of claims 1-9.

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