Battery module

Abstract

The utility model discloses a battery module, include: electric core group, electric core group includes at least two series connection electric core, heating sheet, electric core group is along its length direction's both sides respectively is provided with heating sheet, heating sheet with electric core group is pasted, buffer pad, buffer pad is located electric core group's one side of heating sheet away, end board, end board is located electric core group width direction's both sides, side plate, side plate is located buffer pad's one side away from electric core group, side plate with end board connection fixed. This battery module sets up buffer pad outside heating sheet, when installing heating sheet on battery module, buffer pad is located between heating sheet and side plate, when electric core expands in the end of charge and discharge, buffer pad extrudes heating sheet to make it and electric core group keep pasting, avoid that heating film four around edge is warped.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, specifically a battery module. Background Technology

[0002] Batteries, as an important energy storage device, are widely used in many fields such as electric vehicles, portable electronic devices, industrial and commercial applications, and home energy storage stations. Battery performance is greatly affected by temperature, especially in low-temperature environments, where battery charge and discharge efficiency, capacity, and cycle life all decrease significantly.

[0003] In existing technologies, heating films are typically used to heat battery modules. The heating film assembly is directly attached to the battery cell. The battery cell expands at the end of the discharge period, generating stress. This reduces the adhesive strength on the heating film, causing the edges of the heating film to curl up, resulting in reduced heating efficiency. In severe cases, it can cause the heating film to burn out, ultimately leading to a safety accident. Summary of the Invention

[0004] In order to overcome the defects in the prior art, the present invention provides a battery module with a buffer pad on the outside of the heating element. When the heating element is installed on the battery module, the buffer pad is located between the heating element and the side plate. When the battery cell expands at the end of the charging and discharging period, the buffer pad squeezes the heating element to keep it in close contact with the battery cell assembly, thus preventing the heating film from curling up around the edges.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a battery module, comprising: A battery cell assembly, the battery cell assembly comprising at least two battery cells connected in series; Heating elements are provided on both sides of the battery cell assembly along its length, and the heating elements and the battery cell assembly are attached to each other; A buffer pad is provided on the side of the heating element away from the battery cell assembly; End plates are disposed on both sides of the cell assembly in the width direction; A side plate is provided on the side of the buffer pad away from the battery cell assembly, and the side plate is connected and fixed to the end plate.

[0006] With the above technical solution, the battery module has a buffer pad on the outside of the heating element. When the heating element is installed on the battery module, the buffer pad is located between the heating element and the side plate. When the battery cell expands at the end of the charging and discharging period, the buffer pad squeezes the heating element to keep it in close contact with the battery cell assembly, thus preventing the heating film from curling up around the edges.

[0007] Furthermore, the thickness of the buffer pad is 2.5mm to 3.5mm.

[0008] Furthermore, the area of ​​the buffer pad is greater than or equal to the area of ​​the second insulating film to ensure that the buffer pad completely covers the insulating layer.

[0009] Furthermore, the buffer pad is made of EVA foam, which has a flame retardancy rating of UL9540A-0 and good electrical insulation properties to ensure the safety of the battery module. In addition, the material has a high resilience rate, which can effectively absorb the cyclic expansion stress of the battery cell and prevent the heating film from curling up around the edges.

[0010] Furthermore, the heating element includes: A heating layer, the heating layer comprising at least two heating films arranged side by side; Conductive circuitry, wherein the conductive circuitry is distributed between the heating films; An insulating layer, comprising a first insulating film and a second insulating film, the first insulating film and the second insulating film being distributed on both sides of the heating layer, the first insulating film being able to be bonded to the battery cell assembly, and the buffer pad being bonded to the second insulating film.

[0011] Furthermore, the buffer pad has double-sided adhesive on the side facing away from the battery cell assembly, and the double-sided adhesive is attached to the inner side of the side plate. The double-sided adhesive is used to fix the position of the buffer pad and prevent misalignment between the buffer pad and the insulation layer during installation.

[0012] Furthermore, it also includes a cell connection system, through which each of the cells is connected. The cell connection system is equipped with a flexible circuit board or a flexible flat cable, which is connected to the cells. The flexible circuit board or flexible flat cable can monitor the voltage and temperature of the cell assembly in real time.

[0013] Furthermore, it also includes a battery management system, which is connected to the cell connection system. The battery management system receives voltage and temperature data detected by the cell connection system. Users can monitor the voltage and temperature of the battery module in real time through the battery management system.

[0014] Furthermore, the heating element is connected to the battery management system. When the temperature data received by the battery management system is lower than a preset value, the battery management system drives the heating element to operate. The user can set a temperature threshold in the battery management system. When the battery module temperature obtained by the battery management system is lower than the threshold, the heating element is automatically activated to heat the battery module.

[0015] Based on the above technical solution, the beneficial effects of this utility model are as follows: The battery module disclosed in this application has a buffer pad on the outside of the heating element. When the heating element is installed on the battery module, the buffer pad is located between the heating element and the side plate. When the battery cell expands at the end of the charging and discharging period, the buffer pad squeezes the heating element to keep it in close contact with the battery cell assembly, thus preventing the heating film from curling up around the edges.

[0016] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the battery module structure in an embodiment of this utility model; Figure 2 This is a schematic diagram of the end plate in an embodiment of this utility model.

[0019] The reference numerals in the above figures are as follows: 1. Battery cell assembly; 2. Battery cell connection system; 3. Heating element; 4. Buffer pad; 5. End plate; 51. Base plate; 52. Connecting plate; 521. First connecting hole; 6. Side plate; 61. Second connecting hole. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] Example: This example discloses a battery module, including: Cell group 1, wherein cell group 1 comprises multiple cells connected in series. For example... Figure 1As shown, the individual battery cells are connected via a cell connection system 2. The cell connection system 2 is a component used to connect and manage the battery cells in a battery pack, primarily used in the fields of power batteries and energy storage batteries. The cell connection system 2 consists of signal acquisition components such as FPC and FFC, plastic structural parts, copper and aluminum busbars, etc., connected into a whole through processes such as hot pressing or riveting, realizing functions such as high-voltage series and parallel connection of battery cells, temperature sampling, and voltage sampling.

[0023] The FPC is a flexible circuit board, and the FFC is a flexible flat cable. The FPC / FFC integrates an NTC thermistor via surface mount technology, directly contacting the battery cell tabs or aluminum busbars to achieve multi-point temperature monitoring. The FPC / FFC is directly connected to the battery cell tabs via copper foil circuitry, supporting high-precision voltage acquisition.

[0024] Through the above scheme, the cell connection system 2 can detect the voltage and temperature data of the cell group in real time.

[0025] Heating film assemblies are respectively provided on both sides of the battery cell assembly 1 along its length. Each heating film assembly includes a heating element 3 and a buffer pad 4. The heating element 3 includes a heating layer comprising two heating films arranged side-by-side. A conductive line is provided between the two heating films in a serpentine arrangement. An insulating layer is provided on both sides of the heating layer, comprising a first insulating film and a second insulating film distributed on both sides of the heating layer. The first insulating film has double-sided adhesive on its side facing away from the heating layer, and is adhered to the battery cell assembly 1 by the double-sided adhesive. The buffer pad 4 is provided on the side of the second insulating film facing away from the heating layer. The buffer pad 4 is made of EVA foam with a thickness of 3mm.

[0026] In some feasible embodiments, the buffer pad 4 can be made of other materials such as silicone. It should be noted that the material of the buffer pad 4 needs to have high flame retardancy and good electrical insulation properties to ensure the safety of the battery module. It also needs to have a high resilience to effectively absorb the cyclic expansion stress of the battery cell and prevent the heating film from curling up around the edges.

[0027] The battery cell assembly 1 has end plates 5 on both sides along its width direction, such as... Figure 1As shown, the end plate 5 includes a base plate 51 and a connecting plate 52 disposed on the periphery of the base plate, the connecting plate 52 being vertically connected to the periphery of the base plate 51. A first connecting hole 521 is provided on the base plate 51. Side plates 6 are respectively provided on both sides of the battery cell assembly 1 along its length direction, and second connecting holes 61 are provided at both ends of the side plates 6 along their length direction, the second connecting holes 61 and the first connecting holes 521 being opposite to each other. The side plates 6 and the end plate 5 are connected and fixed by rivets passing through the first connecting holes 521 and the second connecting holes 61. The heating film assembly is sandwiched between the side plates 6 and the battery cell assembly 1.

[0028] The buffer pad 4 has a 0.2mm thick double-sided adhesive on the side facing away from the heating element 3, and the buffer pad 4 is attached to the inner side of the side plate 6 by the double-sided adhesive. It should be noted that the area of ​​the buffer pad 4 is greater than or equal to the area of ​​the heating element 3 to ensure that the buffer pad 4 completely covers the heating element 3 and can completely press the heating element 3 into contact with the battery cell assembly 1.

[0029] Through the above technical solution, the heating film assembly has a buffer pad outside the insulation layer. When the heating film assembly is installed on the battery module, the buffer pad 4 is located between the insulation layer and the side plate 6. When the battery cell expands at the end of the charging and discharging period, the buffer pad 4 squeezes the heating sheet 3 to keep it in close contact with the battery cell assembly 1, so as to prevent the heating film from curling up around the edges.

[0030] The battery module also includes a battery management system. The cell connection system 2 is connected to the battery management system, and the battery management system receives voltage and temperature data detected by the cell connection system 2. Users can monitor the voltage and temperature of the battery module in real time through the battery management system.

[0031] The heating element is connected to the battery management system. When the battery management system receives temperature data detected by the cell connection system 2 that is lower than a preset value, the battery management system drives the heating element to work. The user can set a temperature threshold in the battery management system. When the battery module temperature obtained by the battery management system is lower than the threshold, the heating element will automatically start to heat the battery module.

[0032] In some feasible embodiments, when the battery management system controls the heating element to heat the battery module, the battery management system monitors the temperature of the battery module in real time according to the cell connection system 2, and dynamically adjusts the output power to the heating element according to the received temperature data, so that the temperature of the battery module gradually increases and is maintained within the target temperature range.

[0033] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. A battery module, characterized in that, include: A battery cell assembly, the battery cell assembly comprising at least two battery cells connected in series; Heating elements are provided on both sides of the battery cell assembly along its length, and the heating elements and the battery cell assembly are attached to each other; A buffer pad is provided on the side of the heating element away from the battery cell assembly; End plates are disposed on both sides of the cell assembly in the width direction; A side plate is provided on the side of the buffer pad away from the battery cell assembly, and the side plate is connected and fixed to the end plate.

2. The battery module as described in claim 1, characterized in that, The thickness of the buffer pad is 2.5mm to 3.5mm.

3. The battery module as described in claim 1, characterized in that, The area of ​​the buffer pad is greater than or equal to the area of ​​the heating element.

4. The battery module as described in claim 1, characterized in that, The cushioning pad is made of EVA foam.

5. The battery module as described in claim 1, characterized in that, The heating element includes: A heating layer, the heating layer comprising at least two heating films arranged side by side; Conductive circuitry, wherein the conductive circuitry is distributed between the heating films; An insulating layer, comprising a first insulating film and a second insulating film, the first insulating film and the second insulating film being distributed on both sides of the heating layer, the first insulating film being able to be bonded to the battery cell assembly, and the buffer pad being bonded to the second insulating film.

6. The battery module as described in claim 5, characterized in that, The buffer pad has double-sided adhesive on the side opposite to the battery cell assembly, and the double-sided adhesive is attached to the inside of the side plate.

7. The battery module as described in claim 1, characterized in that, It also includes a cell connection system, through which each of the cells is connected. The cell connection system is provided with a flexible circuit board or a flexible flat cable, and the flexible circuit board or flexible flat cable is connected to the cells.

8. The battery module as described in claim 7, characterized in that, It also includes a battery management system, the cell connection system is connected to the battery management system, and the battery management system receives voltage and temperature data detected by the cell connection system.

9. The battery module as described in claim 8, characterized in that, The heating element is connected to the battery management system. When the temperature data received by the battery management system is lower than a preset value, the battery management system drives the heating element to work.

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