Battery module, battery pack and power device

Abstract

The utility model provides a battery module, a battery pack and a power plant, the battery module provided by the utility model comprises two battery cell assemblies arranged side by side, and further comprises a first heat insulation part arranged between two adjacent battery cells of each battery cell assembly in the battery cell stacking direction, and a second heat insulation part arranged between two adjacent battery cells of each battery cell assembly, the second heat insulation part is arranged between the two battery cell assemblies; and the third heat insulation parts are arranged at the front end and the rear end of the two battery core assemblies which are arranged side by side in the battery core stacking direction. According to the battery module disclosed by the utility model, the use safety and the use quality of the battery pack can be improved by optimizing the structure of the battery module.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and particularly relates to a battery module. The utility model also relates to a battery pack provided with the above battery module, and a power device provided with the above battery pack. Background Art

[0002] With the rapid development of the new energy industry, battery modules with high energy density and high power density are widely used in power battery systems. However, while these high-performance battery modules bring longer cruising range and faster charging speed, they also face a higher risk of thermal runaway.

[0003] When a thermal runaway occurs in a battery pack, it generally starts from a battery cell. A large amount of heat is generated during the charging and discharging process of the battery cell. When this heat cannot be discharged in time and accumulates to a certain extent, thermal runaway of a single battery cell will occur. If no measures are taken for the thermal runaway of a single battery cell, a large amount of heat generated by the thermal runaway will be transferred to adjacent battery cells, resulting in the spread of thermal runaway and causing the entire pack to experience thermal runaway, which is not conducive to the safety of battery pack use and thus not conducive to improving the use quality of the battery pack. Summary of the Utility Model

[0004] In view of this, the utility model aims to propose a battery module to improve the use quality of the battery module.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A battery module includes two battery cell assemblies arranged side by side, and further includes:

[0007] A first heat insulation part, which is arranged between adjacent two battery cells of each of the battery cell assemblies in the battery cell stacking direction;

[0008] A second heat insulation part, which is arranged between the two battery cell assemblies;

[0009] A third heat insulation part, which is arranged on the front end face and the rear end face after the two battery cell assemblies are arranged side by side along the battery cell stacking direction.

[0010] Further, the first heat insulation part includes heat insulation strips arranged side by side or a heat insulation frame arranged in a loop shape.

[0011] Further, the first heat insulation part is made of aerogel felt.

[0012] Further, the second heat insulation part includes a plurality of heat insulation pads arranged corresponding to the number of battery cells.

[0013] Further, the heat insulation pad is made of ceramized silicone rubber.

[0014] Further, the third heat insulation part includes a support layer and a buffer layer fixedly arranged on the support layer;

[0015] When the third heat insulation part is arranged on the battery cell assembly, the buffer layer faces the battery cell assembly.

[0016] Further, the support layer is made of epoxy board and the buffer layer is made of elastic foam.

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

[0018] In the battery module of the utility model, through the arrangement of the first heat insulation part, the second heat insulation part and the third heat insulation part, a heat insulation cavity for a single battery cell is formed, so that each battery cell is in the heat insulation cavity. When a single battery cell has a thermal runaway, the first heat insulation part, the second heat insulation part and the third heat insulation part can isolate the battery cell with thermal runaway, slow down the influence of the battery cell with thermal runaway on adjacent battery cells, which is beneficial to improving the use safety of the battery module, and thus helps to improve the use safety of the battery pack. And by using the first heat insulation part, the second heat insulation part and the third heat insulation part as end plates, the original module end plates are omitted, the energy density of the battery module is improved, and thus helps to improve the use quality of the battery pack.

[0019] The first heat insulation part is a heat insulation strip or a heat insulation frame arranged in a loop shape, which is beneficial to the lightweight design of the battery module and helps to improve the use quality of the battery pack.

[0020] The first heat insulation part uses aerogel felt, which is beneficial to a better lightweight design of the battery module while taking into account the heat insulation performance.

[0021] The second heat insulation part is multiple heat insulation pads, which is beneficial to arranging the corresponding number of heat insulation pads according to the number of battery cells and helps to the lightweight design of the battery module.

[0022] The heat insulation pad is made of ceramized silicone rubber, which not only takes into account the heat insulation performance but also has a certain buffering performance, helps to protect the battery cells and reduce the influence of external mechanical shocks on the battery cells.

[0023] The third heat insulation part is a double-layer structure, which is convenient for processing and can have a good support effect and a good effect of slowing down external mechanical shocks, which is beneficial to improving the use safety of the battery module.

[0024] The support layer is made of epoxy board and the buffer layer is made of elastic foam, which is beneficial to reducing the friction when the battery module is assembled into the battery pack, and the elastic foam can provide a certain pre-tightening force for the battery module and can absorb the expansion generated during the use of the battery module, which is beneficial to improving the use quality of the battery module.

[0025] The present utility model further provides a battery pack, in which the battery modules as described above are assembled, and a fourth heat insulation part is provided between two adjacent battery modules.

[0026] Furthermore, the fourth heat insulation part is made of aerogel felt.

[0027] Meanwhile, the present utility model also provides a power device, in which the battery pack as described above is assembled.

[0028] The battery pack and the power device of the present utility model and the battery module as described above have the same beneficial effects as the prior art, so they will not be repeated here. Description of the Drawings

[0029] 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 and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0030] Figure 1 is a schematic structural diagram of the battery module according to an embodiment of the present utility model;

[0031] Figure 2 is a schematic combined structural diagram of a plurality of battery modules according to an embodiment of the present utility model;

[0032] Figure 3 is a schematic structural diagram of the battery module assembled in the battery pack according to an embodiment of the present utility model;

[0033] Description of the Reference Numerals:

[0034] 1. Cell assembly;

[0035] 101. Cell;

[0036] 2. First heat insulation part;

[0037] 3. Second heat insulation part;

[0038] 301. Heat insulation pad;

[0039] 4. Third heat insulation part; 5. Fourth heat insulation part;

[0040] s. Front end face; t. Rear end face; k. Heat insulation cavity. Detailed Embodiments

[0041] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0042] 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 component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed 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 construed as indicating or implying relative importance.

[0043] Taking the battery pack in which the battery module described in the present utility model is located as an example, the orientation terms such as "upper, lower, left, right, front, back" used in the embodiments are defined based on the up-down direction (also known as the height direction, or the overall package Z direction), left-right direction (also known as the width direction, or the overall package Y direction), and front-back direction (also known as the length direction, or the overall package X direction) of the vehicle. "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, with the side closer to the middle of the battery pack being "inner" and the opposite being "outer".

[0044] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connecting piece" 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 components. 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.

[0045] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0046] Embodiment 1

[0047] This embodiment relates to a battery module, which is beneficial to improving the use quality of the battery module by optimizing the structure of the battery module.

[0048] In terms of the overall structure, as Figure 1 shown, the battery module in this embodiment includes two cell assemblies 1 arranged side by side, and also includes a first heat insulation part 2, a second heat insulation part 3, and a third heat insulation part 4.

[0049] Among them, the first heat insulation part 2 is arranged between adjacent two cells 101 of each cell assembly 1 in the stacking direction of the cells 101, the second heat insulation part 3 is arranged between the two cell assemblies 1, and the third heat insulation part 4 is arranged on the front end face s and the rear end face t after the two cell assemblies 1 are arranged side by side in the stacking direction of the cells 101.

[0050] With the above settings, in this embodiment, the battery module forms a heat insulation cavity k for a single battery cell 101 through the first heat insulation part 2, the second heat insulation part 3 and the third heat insulation part 4, so that each battery cell 101 is located in the heat insulation cavity k. When a single battery cell 101 has a thermal runaway, the first heat insulation part 2, the second heat insulation part 3 and the third heat insulation part 4 can isolate the battery cell 101 with thermal runaway, slow down the influence of the battery cell 101 with thermal runaway on adjacent battery cells 101, which is beneficial to improving the use safety of the battery module, and helps to improve the use safety of the battery pack. Moreover, by using the first heat insulation part 2, the second heat insulation part 3 and the third heat insulation part 4 as end plates, the original module end plates are omitted, the energy density of the battery module is improved, and the use quality of the battery pack is helped to be improved.

[0051] Specifically, in this embodiment, as an exemplary structure, in combination with Figure 1 and Figure 2 as shown, the battery cell assembly 1 of the battery module in this embodiment is formed by stacking multiple battery cells 101 with large surfaces facing each other in sequence. The side surfaces of two battery cell assemblies 1 are arranged side by side relative to each other, and the battery cells 101 in each battery cell assembly 1 are connected in series with each other and in series with adjacent battery cell assemblies 1. In this embodiment, the battery cell 101 uses a ternary battery cell 101 with a higher energy density compared to a lithium iron phosphate battery cell 101.

[0052] For better lightweight design, the first heat insulation part 2 of the battery module in this embodiment includes heat insulation strips arranged side by side or a heat insulation frame arranged in a loop shape, so that the first heat insulation part 2 is a heat insulation strip or a heat insulation frame arranged in a loop shape, which is beneficial to the lightweight setting of the battery module and helps to improve the use quality of the battery pack.

[0053] More specifically, the first heat insulation part 2 is made of a lighter heat insulation material. In this embodiment, for example, it can be made of aerogel felt, so that the first heat insulation part 2 is made of aerogel felt. On the premise of taking into account the heat insulation performance, it is beneficial to the better lightweight design of the battery module. The first heat insulation part 2 is bonded to the large surfaces of two adjacent battery cells 101 by means of double-sided adhesive. The thickness of the first heat insulation part 2 can be, for example, 2mm - 4mm. This thickness can be 2mm, 3mm or 4mm, and only needs to meet the requirements of the thermal runaway design of the battery pack.

[0054] It should be noted that when the battery module design does not require thermal runaway isolation of a single battery cell 101, the first heat insulation part 2 can also be made of elastic foam, for example, MPP or silicone foam with better compressibility can be used. The thickness of the elastic foam can be determined according to the expansion space of the battery cell 101, the forming force and the compression rate of the foam.

[0055] In order to better achieve the lightweight design of the battery module, the second heat insulation part 3 of the battery module in this embodiment includes a plurality of heat insulation pads 301 arranged corresponding to the number of battery cells 101. The heat insulation pads 301 are strip-shaped and adhered between adjacent two battery cell assemblies 1. The material of the heat insulation pads 301 can be, for example, ceramized silicone rubber. The heat insulation pads 301 are adhered to the sides of the battery cells 101 in the form of double-sided adhesive tape, so as to bond the adjacent two battery cell assemblies 1 together, making the second heat insulation part 3 be a plurality of heat insulation pads 301, which is conducive to arranging the corresponding number of heat insulation pads 301 according to the number of battery cells 101, and helps the lightweight design of the battery module. The heat insulation pads 301 are made of ceramized silicone rubber, which not only takes into account the heat insulation performance, but also has a certain buffering performance, helps to protect the battery cells 101, and reduces the influence of external mechanical shocks on the battery cells 101.

[0056] Specifically, the thickness of the heat insulation pads 301 can be, for example, 2 mm - 4 mm. This thickness can be 2 mm, 3 mm or 4 mm, and only needs to meet the requirements of the thermal runaway design of the battery pack. The thickness of the adhesive tape can be 0.2 mm - 0.4 mm, so as to absorb the flatness of the side of the battery cell 101, and enable the heat insulation pads 301 to better adhere to the sides of the battery cells 101. The thickness of the adhesive tape can be, for example, 0.2 mm, 0.3 mm or 0.4 mm, and only needs to meet the requirement of absorbing the flatness of the side of the battery cell 101 and not affecting other structures due to excessive adhesive tape.

[0057] In order to better improve the use safety of the battery module, the third heat insulation part 4 of the battery module in this embodiment includes a support layer and a buffer layer fixed on the support layer. When the third heat insulation part 4 is arranged on the battery cell assembly 1, the buffer layer faces the battery cell assembly 1, making the third heat insulation part 4 a double-layer structure, which is convenient for processing, and can have a good support effect and a good effect of slowing down external mechanical shocks, which is conducive to improving the use safety of the battery module.

[0058] Specifically, the support layer of the third heat insulation part 4 in this embodiment can be made of epoxy board, and the buffer layer can be made of elastic foam, so that the support layer is an epoxy board and the buffer layer is elastic foam, which is conducive to reducing the friction when the battery module is assembled into the battery pack, and the elastic foam can provide a certain pre-tightening force for the battery module, and can absorb the expansion generated during the use of the battery module, which is conducive to improving the use quality of the battery module.

[0059] More specifically, the thickness of the epoxy board in this embodiment can be, for example, 1 mm - 2 mm. In this embodiment, the thickness is taken as 1 mm. Of course, the thickness can also be 2 mm, as long as it can play a role in protecting against thermal runaway of the battery pack. The friction coefficient of the epoxy board is 0.12 - 0.16, which helps to reduce the friction between the battery module and the battery pack side beam when the battery module is assembled into the battery pack. The elastic foam used for the buffer layer can be made of materials with low thermal conductivity and high compression ratio, such as MPP, PU foam or silicone foam, which can keep the battery cell 101 warm and provide expansion space, and can also provide the pre-grouping force for assembling the battery module into the battery pack. The thickness of the buffer layer can be, for example, 1.5 mm - 3 mm. In this embodiment, it is 15 times foamed MPP with a thickness of 3 mm. Of course, the thickness of the buffer layer can also be 1.5 mm, 2 mm or 2.5 mm, and only the thickness needs to be set according to the properties of the material selected for the buffer layer.

[0060] When the battery module in this embodiment is arranged in the battery pack, in combination with Figure 2 and Figure 3 as shown, the corresponding arrangement position can be adjusted according to the arrangement of the inner beams in the battery pack. After multiple battery modules are arranged in the battery pack, in order to better ensure the mode of the battery module, a pressure bar is provided on the top of the battery module, and the pressure bar is bonded to both sides of the top of the battery cell 101. By bonding the top of the battery cell assembly 1 with the pressure bar, the mode and mechanical properties of the battery module are improved.

[0061] Moreover, when multiple battery modules are arranged in the battery pack, the sides of the battery modules are arranged opposite to each other, the front end face s and the rear end face t of the battery module are respectively arranged facing the cross beam and the front and rear side beams of the battery pack, and the output poles and low-voltage plugs of the battery module can all be arranged at the front part of the battery pack for outgoing lines, so as to reduce the space required for arranging the copper bars and wire harnesses inside the battery pack, improve the volume utilization rate of the whole pack, and thus improve the energy density of the battery pack.

[0062] The battery module of this embodiment forms a heat insulation cavity k surrounded by the first heat insulation layer, the second heat insulation layer and the third heat insulation layer, which is beneficial to the thermal runaway isolation of each battery cell 101, improves the use safety of the battery module, and uses the heat insulation layer as the end plate, saving the space originally required for arranging the heat insulation structure on the end plate, which is beneficial to improving the energy density of the battery module, and thus beneficial to improving the energy density of the battery pack, improving the use quality of the battery module, and further contributing to improving the use quality of the battery pack.

[0063] Embodiment 2

[0064] This embodiment relates to a battery pack, in which the battery module described in Embodiment 1 is assembled, and a fourth heat insulation part 5 is assembled between two adjacent battery modules.

[0065] Specifically, in combination withFigure 3 As shown, the fourth heat insulation part 5 is made of aerogel felt. The fourth heat insulation part 5 is double-sided adhesively pasted between two adjacent battery modules. The thickness of the fourth heat insulation part 5 can be, for example, 1 mm - 3 mm. This thickness can be 1 mm, 2 mm or 3 mm, as long as it can meet the requirements of the thermal runaway design of the battery pack.

[0066] For the battery pack of this embodiment, the assembly of the battery modules in Embodiment 1 can improve the energy density of the battery pack and can also take into account the thermal runaway isolation of the battery pack, which helps to improve the safety and quality of use of the battery pack.

[0067] Embodiment 3

[0068] This embodiment relates to a power device, and the battery pack in Embodiment 2 is provided in the power device.

[0069] For the power device in this embodiment, through the setting of the battery pack in Embodiment 2, the thermal runaway isolation of the battery pack can be taken into account, which helps to improve the safety and energy density of the power device, and thus improves the quality of use of the power device.

[0070] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery module, comprising two battery cell assemblies arranged side by side, characterized in that: Also includes: A first heat insulating portion, the first heat insulating portion is arranged between two adjacent battery cells of each battery cell assembly according to the battery cell stacking direction; A second heat insulating portion, wherein the second heat insulating portion is arranged between the two battery cell assemblies; A third heat insulating portion is arranged along the battery cell stacking direction on the front end surface and the rear end surface of the two battery cell assemblies arranged side by side.

2. The battery module according to claim 1, characterized in that: The first heat insulating part includes heat insulating strips arranged side by side or a heat insulating frame arranged in a circle shape.

3. The battery module according to claim 2, characterized in that: The first heat insulating part is made of aerogel felt.

4. The battery module according to claim 1, characterized in that: The second thermal insulation part includes a plurality of thermal insulation pads arranged corresponding to the number of the battery cells.

5. The battery module according to claim 4, characterized in that: The thermal insulation pad is made of ceramic silicone rubber.

6. The battery module according to claim 1, characterized in that: The third heat insulation part includes a support layer and a buffer layer fixed on the support layer; When the third heat insulating portion is arranged on the battery cell assembly, the buffer layer faces the battery cell assembly.

7. The battery module according to claim 6, characterized in that: The supporting layer is made of epoxy board, and the buffer layer is made of elastic foam.

8. A battery pack, characterized in that: The battery pack is equipped with the battery module according to any one of claims 1 to 7, and a fourth heat insulating portion is provided between two adjacent battery modules.

9. The battery pack according to claim 8, characterized in that: The fourth heat insulating part is made of aerogel felt.

10. A power device, characterized in that: The power device is provided with a battery pack according to any one of claims 8 to 9.

Images