Battery module, battery pack and electric device

Abstract

The utility model provides a battery module, a battery pack and an electric device. The utility model relates to a battery module, which comprises a battery cell assembly, a plurality of battery cells and a plurality of battery cells, the separation part is arranged between the two adjacent battery cells so as to separate the large surfaces of the two adjacent battery cells, the separation part comprises a heat insulation layer and a heating layer, the heating layer is located on at least one surface of the heat insulation layer, and the heating layer is located between the heat insulation layer and the large surfaces of the battery cells. According to the battery module, the overall performance of the battery pack can be improved, and the use quality of the battery pack can be improved.

Description

TECHNICAL FIELD

[0001] The utility model battery pack relates to technical field, especially relates to a battery module. The utility model also relates to a battery pack provided with the above-mentioned battery module, and the utility model also relates to an electric device provided with the above-mentioned battery pack. BACKGROUND

[0002] The performance of the battery pack in a low-temperature environment is poor, especially in cold weather conditions such as winter, and its charge-discharge performance will decrease significantly. Therefore, how to improve the performance of the battery cell in a low-temperature environment has become a technical problem to be solved. In view of the poor low-temperature performance of the battery cell, the current main method is to improve the performance of the battery cell itself and to strengthen the external heat preservation and to heat the battery cell in a low-temperature environment to improve the temperature. In the thermal management system, the heating film and the cold plate are two common heating methods.

[0003] The method of heating the battery cell by using the cooling plate has certain limitations. Due to the complexity of the flow channel design and the difference in the heat exchange capacity of the battery cells at different positions in the whole battery pack, the heating rate needs to be improved by increasing the temperature of the cooling liquid. However, this method will cause a large temperature difference inside the battery pack, affecting the consistency and service life of the battery cell.

[0004] The scheme of using the heating film also has many deficiencies. The heating film is usually pasted on the top surface, bottom surface or side surface of the battery module as a separate component, and the area in contact with the battery cell is limited, mostly the narrow surface of the battery cell, resulting in a low heating rate. In addition, the large heating film is prone to poor adhesion and other manufacturing problems during the pasting process, increasing the production difficulty and cost. More importantly, the heating film cannot realize the individual control of each battery cell, resulting in serious energy waste and reducing the overall performance of the battery pack, which is not conducive to improving the use quality of the battery pack. CONTENT OF THE UTILITY MODEL

[0005] Therefore, the utility model aims at providing a battery module to improve the use quality of the battery pack.

[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0007] A battery module, comprising:

[0008] A battery cell assembly, comprising a plurality of series-connected battery cells;

[0009] A module end plate arranged at both ends of the battery cell assembly;

[0010] A partition is arranged between two adjacent battery cells and / or between the module end plate and the battery cell assembly, and the partition comprises a heat insulation layer and a heating layer, the heating layer is arranged on at least one surface of the heat insulation layer and faces the battery cell.

[0011] Further, the heat insulation layer is a layered structure made of any one of aerogel felt, ceramic fiber felt, glass fiber felt, pre-oxidized fiber felt, mica plate or epoxy plate.

[0012] Further, the heat insulation layer is a layered structure made of aerogel felt, and the thickness b of the heat insulation layer is in a multiple relationship with the thickness B of the battery cell.

[0013] When the battery cell is an iron lithium battery cell, the thickness of the heat insulation layer ranges from 0.001B to 0.05B.

[0014] When the battery cell is a ternary battery cell, the thickness of the heat insulation layer ranges from 0.001B to 0.2B.

[0015] Further, the pole of the battery cell is arranged on both sides of the length direction of the battery cell, and the electrical connection end of the heating layer is welded to the integrated busbar of the battery module.

[0016] Further, the heat insulation layer is a layered structure made of any one of ceramic fiber felt, glass fiber felt, pre-oxidized fiber felt, mica plate or epoxy plate, and the thickness b of the heat insulation layer is in a multiple relationship with the thickness B of the battery cell.

[0017] When the battery cell is an iron lithium battery cell, the thickness of the heat insulation layer ranges from 0.001B to 0.1B.

[0018] When the battery cell is a ternary battery cell, the thickness of the heat insulation layer ranges from 0.001B to 0.4B.

[0019] Further, the partition is connected between two adjacent battery cells by adhesion; and / or, the partition is connected between the module end plate and the battery cell assembly by adhesion.

[0020] Further, the heating layer is a film structure with resistance wires embedded inside.

[0021] Further, the heating layer is a polyimide heating film, and the thickness of the heating layer ranges from 0.1mm to 1.5mm; and / or, the heating power density of the heating layer is 0.4w / cm 2 -0.5w / cm 2 .

[0022] Compared with the prior art, the utility model has the following advantages:

[0023] The battery module has the heat insulation layer, and the adjacent battery cells are separated, heat spread after heat run away of the battery cells is prevented, the heating part is arranged, the temperature of the battery cells is increased in a low temperature working environment, the battery cells are charged and discharged at a suitable temperature, the performance of the battery cells is improved, and the overall performance of the battery pack is improved.

[0024] In addition, the heat insulation layer is a layered structure made of any one of aerogel felt, ceramic fiber felt, glass fiber felt, pre-oxidized silk felt, mica plate or epoxy plate, the heat insulation layer is arranged between the battery cells, processing is facilitated, the structure is simple, and design implementation is facilitated.

[0025] In addition, the heating layer is a film structure in which resistance wires are embedded, the heating layer is arranged, the resistance wires are arranged, heating is facilitated, and design implementation is facilitated.

[0026] The utility model discloses a battery pack, the battery pack is equipped with the battery module as described above.

[0027] The utility model discloses an electric device, the electric device is equipped with the battery pack as described above.

[0028] The battery pack and the electric device have the same beneficial effects as the battery module compared with the prior art, and thus will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0029] The drawings constituting a part of the utility model are used to provide further understanding on the utility model, and the illustrative embodiment and the description of the utility model are used to explain the utility model, and do not constitute improper limitation to the utility model.

[0030] Figure 1 The structure schematic view of the battery module for the utility model embodiment is shown in the drawing.

[0031] Figure 2 The structure schematic view of the separation part for the utility model embodiment is shown in the drawing.

[0032] Figure 3 The structure schematic view of the separation part for the utility model embodiment is shown in the drawing. Figure 1 The enlarged view of B of the structure schematic view of the separation part for the utility model embodiment is shown in the drawing.

[0033] Explanation of reference signs:

[0034] 1. An electric cell assembly;

[0035] 101. An electric cell;

[0036] 2. A partition;

[0037] 201. A heat insulation layer; 202. A heating layer. DETAILED DESCRIPTION

[0038] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0039] In the description of the present application, it should be noted that if the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "outer" and the like appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the present application. The devices or elements indicated or implied must have a specific orientation, a specific orientation and operation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second" and the like appear, they are also used for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0040] For example, in the embodiments described in the present application, the orientation words such as "upper", "lower", "left", "right", "front", "back" are defined based on the up-down direction (also called height direction, or the whole package Z direction), left-right direction (also called width direction, or the whole package Y direction) and front-rear direction (also called length direction, or the whole package X direction) of the battery pack. "Inner" and "outer" are defined based on the outline of the corresponding component, for example, "inner" and "outer" are defined based on the outline of the battery pack, the side close to the middle of the battery pack is "inner", and vice versa.

[0041] In addition, in the description of the present application, unless otherwise explicitly limited, the terms "mounting", "connecting", "connection", "connecting member" should be understood broadly. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in combination with the specific circumstances.

[0042] The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] Embodiment one

[0044] The present embodiment relates to a battery module, in order to optimize the structure of the battery module to improve the use quality of the battery pack.

[0045] As shown in Figures 1 to 2 The battery module in the embodiment includes a battery cell assembly 1, a module end plate, and a partition 2 arranged on the battery cell assembly 1.

[0046] The battery cell assembly 1 includes a plurality of battery cells 101 connected in series, the module end plate is arranged at both ends of the battery cell assembly 1, the partition 2 is arranged between adjacent two battery cells 101 and between the module end plate and the battery cell assembly 1, and the partition 2 includes a heat insulation layer 201 and a heating layer 202, the heating layer 202 is arranged on at least one surface of the heat insulation layer 201 and faces the battery cell 101.

[0047] As arranged above, the battery module in the embodiment can separate adjacent battery cells 101 through the arrangement of the heat insulation layer 201, which is beneficial to preventing the spread of heat after thermal runaway of the battery cell 101, and can improve the temperature of the battery cell 101 in a low-temperature working environment through the arrangement of the heating layer 202, which is beneficial to the charging and discharging work of the battery cell 101 at a suitable temperature and helps to improve the performance of the battery cell 101. When the partition 2 is arranged between the battery cell assembly 1 and the module end plate, the heating layer 202 can heat the battery cell 101 at the end to improve the temperature of the end of the battery module and reduce the temperature difference between the battery cells 101 in the battery cell assembly 1, thereby improving the overall performance of the battery pack and helping to improve the use quality of the battery pack.

[0048] In the embodiment, the heat insulation layer 201 is arranged between adjacent two battery cells 101, which can isolate the spread of heat of the battery cell 101 when the battery cell 101 is in thermal runaway, thereby improving the use safety of the battery pack.

[0049] Specifically, in the embodiment, as an exemplary structure, the heat insulation layer 201 in the embodiment can be a layered structure made of any one of aerogel felt, ceramic fiber felt, glass fiber felt, pre-oxidized silk felt, mica plate, or epoxy plate. Making the heat insulation layer 201 a layered structure made of any one of aerogel felt, ceramic fiber felt, glass fiber felt, pre-oxidized silk felt, mica plate, or epoxy plate is beneficial to the arrangement of the heat insulation layer 201 between the battery cells 101, facilitates processing, has a simple structure, and is beneficial to design and implementation.

[0050] In more detail, as shown in Figures 1 to 3 When the heat insulation layer 201 is a layered structure made of aerogel felt, the thickness b of the heat insulation layer 201 is in a multiple relationship with the thickness B of the battery cell 101, when the battery cell 101 is a lithium-iron battery cell 101, the thickness of the heat insulation layer 201 ranges from 0.001B to 0.05B, and when the battery cell 101 is a ternary battery cell 101, the thickness of the heat insulation layer 201 ranges from 0.001B to 0.2B. Making the heat insulation layer 201 aerogel is beneficial to reducing the thickness of the heat insulation layer 201 and facilitating lightweight design of the battery pack, which is helpful to design and implementation.

[0051] When the thermal insulation layer 201 is a layered structure made of any one of ceramic fiber felt, glass fiber felt, pre-oxidized fiber felt, mica plate or epoxy plate, the thickness b of the thermal insulation layer 201 is also in a multiple relationship with the thickness B of the battery cell 101. When the battery cell 101 is a lithium-iron battery cell 101, the thickness of the thermal insulation layer 201 ranges from 0.001B to 0.1B. When the battery cell 101 is a ternary battery cell 101, the thickness of the thermal insulation layer 201 ranges from 0.001B to 0.4B. Making the thermal insulation layer 201 a layered structure made of any one of ceramic fiber felt, glass fiber felt, pre-oxidized fiber felt, mica plate or epoxy plate facilitates processing and is conducive to design implementation.

[0052] In addition, as shown in Figures 1 to 3 Figures 1 to 3 The heating layer 202 in the embodiment is arranged on the surface of the thermal insulation layer 201 and located between the thermal insulation layer 201 and the large surface of the battery cell 101. Through the arrangement of the heating layer 202, the battery cell 101 can be heated, so that the battery cell 101 has good working temperature in a low temperature environment.

[0053] Specifically, the heating layer 202 in the embodiment is a film structure with resistance wires embedded inside. Making the heating layer 202 a film structure with resistance wires embedded inside facilitates the arrangement of the heating layer 202, and through the arrangement of the resistance wires, heating is facilitated, which is conducive to design implementation.

[0054] More specifically, the heating layer 202 in the embodiment may, for example, be a polyimide heating film. The thickness of the heating layer 202 ranges from 0.1mm to 1.5mm, and the heating power density of the heating layer 202 ranges from 0.4w / cm 2 -0.5w / cm 2 Making the heating layer 202 a polyimide heating film facilitates processing and manufacturing, and has good heating effect, which is conducive to design implementation.

[0055] It is worth mentioning that the heating layer 202 in the embodiment can be directly welded to the integrated busbar of the battery pack, and the heating layer 202 is powered directly through the integrated busbar. In this way, it is conducive to reducing the wiring harness of the heating layer 202 connected to the integrated busbar, and conducive to saving the arrangement space in the battery pack.

[0056] The heating layer 202 in the embodiment is adhered to the heat insulation layer 201 by adhesion. In assembly, the heating layer 202 can be adhered to the heat insulation layer 201 to form the partition 2, and the heating layers 202 on the opposite large faces of the adjacent two battery cells 101 can share one heat insulation layer 201, that is, one heat insulation layer 201 is arranged between the adjacent two battery cells 101, and the heating layers 202 are adhered to the two side faces of the heat insulation layer 201. At this time, the partition 2 is assembled between the battery cells 101 according to the design requirements, and the power supply end of the heating layer 202 is electrically connected to the integrated busbar or the battery management system, so that the assembly of the partition 2 in the battery module is completed.

[0057] In addition, the partition 2 in the embodiment is adhered between the adjacent two battery cells 101 or between the battery cell 101 and the module end plate by adhesion, so that the battery module in the embodiment can be directly fixed without the need of other fixing structures such as a cable tie to fix the battery cell 101. In this way, the space occupied by the cable tie is saved, and the arrangement of the battery module in the battery pack is facilitated.

[0058] The battery module in the embodiment can isolate the heat spread of the battery cell 101 when the battery cell 101 is in thermal runaway, which is beneficial to improve the use safety of the battery cell 101. The overall performance of the battery cell 101 in a low-temperature environment is improved by the arrangement of the heating layer 202, so that the battery cell 101 can be in a good working temperature, thereby improving the overall performance of the battery pack in a low-temperature environment, and helping to improve the use quality of the battery pack.

[0059] Embodiment Two

[0060] The battery pack in the embodiment is provided with the battery module in the embodiment one.

[0061] The battery pack in the embodiment is provided with the battery module in the embodiment one.

[0062] Embodiment Three

[0063] The electric device in the embodiment is provided with the battery pack in the embodiment two.

[0064] The electric device in the embodiment is provided with the battery pack in the embodiment two.

[0065] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery module, characterized by, The battery module comprises: a battery cell assembly comprising a plurality of battery cells connected in series; a module end plate arranged at both ends of the battery cell assembly; a partition arranged between adjacent battery cells and / or between the module end plate and the battery cell assembly, the partition comprising a heat insulation layer and a heating layer, the heating layer being arranged on at least one surface of the heat insulation layer and facing the battery cells.

2. The battery module according to claim 1, wherein: the heat insulation layer is a layered structure made of any one of aerogel felt, ceramic fiber felt, glass fiber felt, pre-oxidized fiber felt, mica plate or epoxy plate.

3. The battery module according to claim 2, wherein: the heat insulation layer is a layered structure made of aerogel felt, and the thickness b of the heat insulation layer is in a multiple relationship with the thickness B of the battery cell; when the battery cell is a lithium-iron battery cell, the thickness b of the heat insulation layer ranges from 0.001B to 0.05B; when the battery cell is a ternary battery cell, the thickness b of the heat insulation layer ranges from 0.001B to 0.2B.

4. The battery module according to claim 2, wherein: the heat insulation layer is a layered structure made of any one of ceramic fiber felt, glass fiber felt, pre-oxidized fiber felt, mica plate or epoxy plate, and the thickness b of the heat insulation layer is in a multiple relationship with the thickness B of the battery cell; when the battery cell is a lithium-iron battery cell, the thickness b of the heat insulation layer ranges from 0.001B to 0.1B; when the battery cell is a ternary battery cell, the thickness b of the heat insulation layer ranges from 0.001B to 0.4B.

5. The battery module according to claim 1, wherein: the pole of the battery cell is arranged at both sides of the length direction of the battery cell, and the electrically connected end of the heating layer is welded to the integrated busbar of the battery module.

6. The battery module according to claim 1, wherein: the partition is connected between adjacent battery cells by adhesion; and / or, the partition is connected between the module end plate and the battery cell assembly by adhesion.

7. The battery module according to any one of claims 1-6, wherein: the heating layer is a film structure with resistance wire embedded therein.

8. The battery module according to claim 7, wherein: the heating layer is a polyimide heating film, and the thickness of the heating layer ranges from 0.1mm to 1.5mm; and / or, The heating power density of the heating layer is 0.4 w / cm 2 -0.5 w / cm 2 .

9. A battery pack, comprising: the battery pack comprises the battery module according to any one of claims 1-8.

10. An electric device, comprising: the electric device comprises the battery pack according to claim 9.

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