A heatable battery module

Abstract

This utility model discloses a heatable battery module, relating to the field of battery module technology. The heatable battery module includes: a battery cell body and heating films disposed on both sides of the battery cell body; the battery cell body includes multiple battery cells arranged in an array along a first direction, and side plates are respectively disposed on both sides of the battery cell body, with CR foam disposed on the side of the side plate facing the battery cell body; the heating film is disposed between the battery cell body and the CR foam, and the heating film includes multiple heating areas arranged in an array along the first direction, each heating area corresponding to one battery cell, and an oblong hole is disposed between two adjacent heating areas. The above-mentioned heatable battery module provides an oblong hole between two adjacent heating areas. After the battery cell body expands and deforms, the oblong hole provides a certain deformation allowance for the heating film, allowing the heating film to release a certain deformation space, solving the problem of the heating film deforming and falling off or tearing after the battery cell body expands, and preventing thermal runaway of the battery.

Description

Technical Field

[0001] This utility model relates to the field of battery module technology, and in particular to a heatable battery module. Background Technology

[0002] Currently, the common method for heating batteries in the industry is to attach a single heating film to the side of the battery module to heat the main body of the cell. However, this method has the following drawbacks: Firstly, it does not consider the impact of expansion and deformation of the heating film caused by the decay of the individual cell's cycle life. This deformation may lead to the heating film deforming and falling off or tearing. If the heating film is heated too much after being dried, it may cause thermal runaway of the battery. Secondly, the heating film in the above-mentioned methods is generally fixed by using double-sided adhesive to stick the heating film to the bottom or side of the battery module. This does not take into account the possibility of improper installation leading to the heating film not adhering tightly to the surface of the main body of the cell, or the temperature cycling that occurs during actual battery operation. The adhesive may age and lose its stickiness due to temperature changes, causing the heating film to lift or fall off in some areas, affecting the safety of the battery module. Furthermore, in scenarios where the battery pack vibrates, the lack of additional support for the heating film will exacerbate the relative displacement between the heating film and the surface of the main body of the cell. In the long run, this may lead to the double-sided adhesive falling off or the heating film being damaged, affecting the safety of the battery module. Therefore, a heatable battery module is proposed to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to provide a heatable battery module that solves the technical problem that causes the heating film to deform, fall off, or tear after the main body of the battery cell expands and deforms due to the decay of the cycle life, and that the battery will thermal runaway if the heating film is heated too high after being burned dry.

[0004] To achieve the above objectives, this utility model provides a heatable battery module, comprising:

[0005] The battery cell body and heating films disposed on both sides of the battery cell body;

[0006] The battery cell body includes multiple battery cell units arranged in an array along a first direction. Side plates are respectively provided on both sides of the battery cell body, and CR foam is provided on the side of the side plate facing the battery cell body.

[0007] The heating film is disposed between the battery cell body and the CR foam. The heating film includes a plurality of heating areas arranged in an array along a first direction. Each heating area corresponds to one battery cell, and a waist-shaped hole is provided between two adjacent heating areas.

[0008] Preferably, each of the heating regions is divided into a first region and a second region with different heating powers in a second direction, the second direction being perpendicular to the first direction, and two adjacent waist-shaped holes being staggered from each other in the second direction.

[0009] Preferably, along the first direction, the plurality of heating regions are arranged such that the heating power of the middle region is small and the heating power of the outer region is large, and along the second direction, each of the heating regions is arranged such that the heating power of the first region is small and the heating power of the second region is large.

[0010] Preferably, the side plate has a first opening on its surface, the CR foam has a second opening on its surface, the second opening is aligned with the first opening, and a temperature sensor is provided on the heating film, the temperature sensor being attached to the surface of the heating film through the second opening.

[0011] Preferably, end plates are provided at both ends of the battery cell body, and PU foam is provided between the end plates and adjacent battery cells, and between two adjacent battery cells.

[0012] Preferably, the side plate is U-shaped, with the opening of the side plate facing the battery cell body, an upper insulating sheet is provided on the upper side of the inner side of the side plate, and a lower insulating sheet is provided on the lower side of the inner side of the side plate.

[0013] Preferably, the CR foam is adhered to the inner wall of the side panel using adhesive.

[0014] Preferably, the surface of the side plate is provided with multiple through holes.

[0015] Preferably, the heating film is a PI heating film.

[0016] Preferably, the two ends of the waist-shaped hole are semi-circular.

[0017] Compared with the above-mentioned background technology, the heatable battery module provided by this utility model has the following beneficial effects:

[0018] (1) The heating film in this utility model includes multiple heating areas arranged in an array along the first direction. An oblong hole is provided between two adjacent heating areas. The oblong hole can provide a certain deformation allowance for the heating film. After the main body of the battery cell expands and deforms, the heating film can release a certain deformation space, which solves the problem that the heating film will deform and fall off or be torn after the main body of the battery cell expands, prevents the battery from thermal runaway, and improves the safety of the battery module.

[0019] (2) In this utility model, CR foam is provided on the side of the side plate facing the main body of the battery cell. The CR foam has a certain resilience and can fill the gap between the heating film and the side plate. Under the pressing force of the side plate, the heating film can be tightly attached to the surface of the main body of the battery cell, thereby avoiding the risk of the heating film lifting, falling off and shifting due to temperature changes, as well as damage to the heating film body, and further improving the safety of the battery module. Moreover, it can reduce the thermal resistance caused by the air gap and ensure that the heat generated by the heating film is efficiently transferred to the main body of the battery cell. Attached Figure Description

[0020] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the heatable battery module provided in an embodiment of the present utility model;

[0022] Figure 2 This is an exploded view of the heatable battery module provided in an embodiment of the present invention;

[0023] Figure 3 This is a planar schematic diagram of the heating film provided in an embodiment of the present invention.

[0024] Specifically, 1-Battery cell body; 101-Battery cell unit; 2-Side plate; 201-Through hole; 202-First opening; 3-CR foam; 301-Second opening; 4-Heating film; 401-Heating area; 4011-First area; 4012-Second area; 402-Oval hole; 5-End plate; 6-PU foam; 7-Upper insulating sheet; 8-Lower insulating sheet; 9-Temperature sensor. Detailed Implementation

[0025] 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.

[0026] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 , Figure 2 and Figure 3 As shown, to achieve the above objectives, this utility model provides a heatable battery module, including: a battery cell body 1 and heating films 4 disposed on both sides of the battery cell body 1, wherein the battery cell body 1 includes a plurality of battery cell units 101 arranged in an array along a first direction, the first direction being... Figure 3 In the X direction; optionally, the heating film 4 is a PI heating film, and the heating elements inside the PI heating film are evenly distributed, which can achieve uniform heating of each battery cell.

[0028] Side plates 2 are respectively provided on both sides of the battery cell body 1. CR foam 3 is provided on the side of the side plate 2 facing the battery cell 101. Optionally, the CR foam 3 is adhered to the inner wall of the side plate 2 with adhesive. By providing CR foam 3 on the side plate 2 facing the battery cell body 1, the CR foam 3 has a certain degree of resilience, which can fill the gap between the heating film 4 and the side plate 2. Under the pressing force of the side plate 2, the heating film 4 can be tightly attached to the surface of the battery cell body 1, thereby avoiding the risk of the heating film 4 locally lifting, falling off, or shifting due to temperature changes, as well as damage to the heating film 4 itself, further improving the safety of the battery module. Furthermore, it can reduce the thermal resistance caused by air gaps, ensuring that the heat generated by the heating film 4 is efficiently transferred to the battery cell body 1.

[0029] The heating film 4 is disposed between the battery cell body 1 and the CR foam 3. The heating film 4 includes a plurality of heating areas 401 arranged in an array along the first direction. Each heating area 401 corresponds to the side of a battery cell 101. Specifically, the area of ​​each heating area 401 is the surface area of ​​the side of each battery cell 101, so as to ensure that the heating area 401 can heat the corresponding battery cell 101 evenly and improve the safety of the battery module.

[0030] An oblong hole 402 is provided between two adjacent heating zones 401, and the oblong hole 402 extends along a second direction, wherein the second direction is... Figure 3 In the Y direction, the second direction is perpendicular to the first direction. By setting a waist-shaped hole 402 between two adjacent heating areas 401, a certain deformation margin is provided for the heating film 4. After the cell body 1 expands and deforms, the heating film 4 can release a certain deformation space, which solves the problem that the heating film 4 will deform and fall off or be torn after the cell body 1 expands, prevents the battery from thermal runaway, and improves the safety of the battery module.

[0031] In some embodiments of this invention, the heating film 4 includes a plurality of heating regions 401 arranged in an array along a first direction, each heating region 401 corresponding to a single battery cell 101. Each heating region 401 of the heating film 4 is further divided in a second direction into a first region 4011 and a second region 4012 with different heating powers, wherein the first region 4011 is located above the second region 4012. This allows a single heating region 401 to generate a non-uniform, customizable heat flow distribution, enabling targeted heat compensation based on differences in heat dissipation or temperature uniformity requirements at different locations of the battery body. This improves the uniformity of the battery body's heating temperature and avoids problems such as localized overheating or insufficient heating.

[0032] In one specific embodiment, two adjacent waist-shaped holes 402 are staggered in the second direction. By staggering two adjacent waist-shaped holes 402 in the second direction, that is, by alternating the distribution of two adjacent waist-shaped holes 402 in the second direction, compared with concentrated openings at a single position in the second direction, it is possible to prevent the local strength of the heating film 4 from decreasing or the heating film 44 from deforming unevenly, thereby further improving the deformation resistance of the heating film 4.

[0033] To address the technical problem of uneven heating of the battery module, where individual cells 101 near the end plates 5 dissipate heat quickly and thus have lower temperatures, while individual cells 101 further away from the center of the battery module dissipate heat slowly and thus have higher temperatures, resulting in a large temperature difference during heating and affecting battery performance and safety, this invention employs a second method. In some embodiments, along a first direction, multiple heating regions 401 are arranged with lower heating power in the middle region and higher heating power in the outer regions. In a second direction, each heating region 401 is arranged with lower heating power in the first region 4011 and higher heating power in the second region 4012. That is, the heating power increases sequentially from the middle heating region 401 to the outermost heating region 401. In the second direction, the heating power of the first region 4011 is less than that of the second region 4012. This partitioned design allows for differentiated power configuration of the heating areas 401, with each area 401 receiving a different heating density, meaning each area 401 has a different heating power. This fully considers the position of different individual cells 101 within the battery module, ensuring a regular distribution of the heating power of the heating film 4. This guarantees that the appropriate heating efficiency can be precisely matched based on the heat dissipation of each individual cell 101, effectively preventing large temperature differences in the battery module during heating, improving the thermal uniformity of the battery module, and thus enhancing battery performance and safety.

[0034] It should be noted that when n battery cells 101 are set in the first direction, the heating film 4 is divided into n heating areas 401 along the first direction according to the number of battery cells 101. The area of ​​each heating area 401 is the surface area of ​​the side of each battery cell 101. Each heating area 401 after division is further divided into a first area 4011 and a second area 4012 separately and equally from the second direction. Thus, the total number of heating areas 401 after the division of each heating film 4 is 2n.

[0035] In some embodiments of this utility model, end plates 5 are respectively provided at both ends of the battery cell body 1. PU foam 6 is provided between the end plates 5 and adjacent battery cell units 101, and similarly, PU foam 6 is provided between two adjacent battery cell units 101. Utilizing the certain compression resilience of the PU foam 6, it can effectively fill the gaps between two adjacent battery cell units 101. While ensuring the stable installation and fixation of each battery cell unit 101, it prevents rigid collisions between the end plates 5 and adjacent battery cell units 101, and between two adjacent battery cell units 101, reducing the risk of damage to the battery cell units 101 and improving the safety of the battery module. Moreover, the PU foam 6 can block heat transfer between two adjacent battery cell units 101, delaying thermal runaway and further improving the safety, stability, and lifespan of the battery module.

[0036] In some embodiments of this utility model, the side plate 2 is U-shaped, with its opening facing the battery cell body 1. This allows the upper and lower ends of the side plate 2 to be snapped onto the edges of the upper and lower end faces of the battery cell body 1. The side plate 2 and CR foam 3 work together to press the heating film 4 tightly against the surface of the battery cell body 1. Furthermore, an upper insulating sheet 7 is provided on the upper inner side of the side plate 2, and a lower insulating sheet 8 is provided on the lower inner side of the side plate 2. While connecting the battery cell body 1 via the side plate 2, this also provides insulation between the side plate 2 and the battery cell body 1, further improving the safety of the battery module.

[0037] In some embodiments of this utility model, the surface of the side plate 2 is provided with a plurality of through holes 201. These through holes 201 can form part of the ventilation path, which helps to efficiently conduct heat to the air when the battery cell 101 generates high heat, thereby improving the heat dissipation efficiency of the battery cell 101. Moreover, the through holes 201 can reduce the overall weight of the side plate 2 and save materials.

[0038] In some embodiments of this utility model, the surface of the side plate 2 is provided with two first openings 202, and the surface of the CR foam 3 is provided with two second openings 301. The second openings 301 are aligned with the first openings 202. A temperature sensor 9 is provided on the heating film 4. The temperature sensor 9 is attached to the surface of the heating film 4 through the second openings 301. Specifically, the temperature sensor 9 is located in the heating area with the highest heating power, such as... Figure 1 and Figure 2 Temperature sensor 9 is set in the second region 4012 of heating film 4 corresponding to the outermost cell 101. Temperature sensor 9 monitors the temperature of the second region 4012 with the largest heating power on heating film 4 during heating, so as to ensure the thermal performance and safety of the battery.

[0039] In some embodiments of this utility model, the two ends of the waist-shaped hole 402 are semi-circular. The semi-circular transition can evenly distribute the stress generated when the battery cell body 1 expands and deforms to the surrounding hole wall, reduce the local stress peak, further reduce the risk of the heating film 4 being torn due to the expansion and deformation of the battery cell body 1, extend the stability of the film in long-term use, and improve the life cycle of the battery module.

[0040] In summary, by setting an oblong hole 402 between two adjacent heating areas 401, after the cell body 1 expands and deforms, the oblong hole 402 can provide a certain deformation allowance for the heating film 4, allowing the heating film 4 to release a certain deformation space. This solves the problem of the heating film 4 deforming and falling off or being torn after the cell body 1 expands, prevents the battery from thermally running away, and effectively improves the safety of the battery module.

[0041] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0042] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A heatable battery module, characterized in that, Includes: a battery cell body and heating films disposed on both sides of the battery cell body; The battery cell body includes multiple battery cell units arranged in an array along a first direction. Side plates are respectively provided on both sides of the battery cell body, and CR foam is provided on the side of the side plate facing the battery cell body. The heating film is disposed between the battery cell body and the CR foam. The heating film includes a plurality of heating areas arranged in an array along a first direction. Each heating area corresponds to one battery cell, and a waist-shaped hole is provided between two adjacent heating areas.

2. The heatable battery module according to claim 1, characterized in that, Each of the heating regions is divided into a first region and a second region with different heating powers in a second direction, the second direction being perpendicular to the first direction, and two adjacent waist-shaped holes being staggered from each other in the second direction.

3. A heatable battery module according to claim 2, characterized in that, Along the first direction, the plurality of heating regions are arranged such that the heating power of the middle region is small and the heating power of the outer region is large. Along the second direction, each of the heating regions is arranged such that the heating power of the first region is small and the heating power of the second region is large.

4. A heatable battery module according to claim 1, characterized in that, The side plate has a first opening on its surface, and the CR foam has a second opening on its surface. The second opening is aligned with the first opening. A temperature sensor is provided on the heating film and is attached to the surface of the heating film through the second opening.

5. A heatable battery module according to claim 1, characterized in that, End plates are provided at both ends of the main body of the battery cell, and PU foam is provided between the end plates and the adjacent battery cell, and between two adjacent battery cell.

6. A heatable battery module according to claim 1, characterized in that, The side plate is U-shaped, with the opening facing the battery cell body. An upper insulating sheet is provided on the upper inner side of the side plate, and a lower insulating sheet is provided on the lower inner side of the side plate.

7. A heatable battery module according to claim 1, characterized in that, The CR foam is adhered to the inner wall of the side panel using adhesive.

8. A heatable battery module according to claim 1, characterized in that, The side plate has multiple through holes on its surface.

9. A heatable battery module according to claim 1, characterized in that, The heating film is a PI heating film.

10. A heatable battery module according to claim 1, characterized in that, The two ends of the waist-shaped hole are semi-circular.

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