Battery heating and heat preservation structure and battery pack

Abstract

The utility model discloses a battery heating thermal insulation structure and battery pack, the battery heating thermal insulation structure comprises a box cover, a heating film, a side isolation pad, a middle buffer fixing pad, a filler and a battery tray, the box cover is detachably connected to the battery tray used for installing a plurality of battery modules; injection holes are formed in the two side walls of the box cover correspondingly, and the injection holes and the side isolation pads are arranged correspondingly; two symmetrically arranged heating films are detachably connected to each of the plurality of battery modules, and side isolation pads are attached to the surfaces, far away from the battery modules, of the two heating films at the edge positions in the plurality of heating films; the space between the side isolation pad and the box cover is filled with the filler through the injection hole. And a middle buffer fixing pad is arranged between every two adjacent battery modules. Therefore, the heating performance of the battery module can be improved, the risk of dry burning caused by poor contact is effectively avoided, and safe and stable operation of the battery module in the whole life cycle is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery heat preservation, in particular to a battery heating and heat preservation structure and a battery pack. Background Art

[0002] In a low temperature environment, the charging and discharging performance of the battery is greatly limited. Low temperature will affect the performance of the battery cell and may even produce some irreversible electrochemical reactions, which will have a direct impact on the battery life. Therefore, in order to improve the charging and discharging performance of the battery in a low temperature environment, the battery needs to be heated.

[0003] At present, the commonly used heating methods on the market include water heater heating, silicone heating sheet heating and polyimide heating sheet heating. Polyimide heating sheet is widely used due to its advantages such as fast heating rate and small space occupation.

[0004] However, polyimide heating sheets still have certain disadvantages when used for battery heating in practical applications, as follows:

[0005] Existing polyimide heating sheets are often bonded to the bonding surface of the battery by adhesive glue. However, due to the existence of manual assembly deviation, some polyimide heating sheets and battery modules may have poor bonding. This poor bonding will cause the battery module to be heated unevenly during the heating process, thereby affecting its performance. What is more serious is that as the battery module is used for a long time and the temperature changes, the adhesive glue is prone to aging and loses its original adhesion ability, making it impossible to fit tightly with the battery. In addition, poor bonding during the assembly process may cause the polyimide heating sheet to dry burn, which will not only increase the risk of fire of the polyimide heating sheet, but also damage the charging and discharging performance of the battery, and may even cause the battery to catch fire, posing a serious safety hazard. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a battery heating and heat preservation structure and a battery pack.

[0007] The first aspect of the utility model provides a battery heating and heat preservation structure including a box cover, a heating film, a side isolation pad, a middle buffer fixed pad, a filler and a battery tray, wherein the box cover is detachably connected to the battery tray for installing multiple battery modules; injection holes are respectively opened on the two side walls of the box cover, and the injection holes are arranged corresponding to the side isolation pads; two symmetrically arranged heating films are detachably connected to the multiple battery modules, and the side isolation pads are attached to the surfaces of two heating films at the edge positions away from the battery modules; the filler is filled in the space between the side isolation pad and the box cover through the injection hole; the middle buffer fixed pad is arranged between each two adjacent battery modules, and the middle buffer fixed pad is attached to the two adjacent heating films.

[0008] The battery heating and heat preservation structure of the utility model injects filler into the injection hole, and after the injection of the filler is completed, the side isolation pads are connected together, and the side isolation pads are squeezed at the same time, so that the side isolation pads are supported and tightly pressed on the heating film, thereby eliminating the gap between the heating film and the battery module that may be caused by dimensional deviation during the assembly process, thereby ensuring full contact between the heating film and the battery module without gaps, which not only greatly improves the heating performance of the battery module, but also effectively avoids the risk of dry burning and fire caused by poor contact, and ensures the safe and stable operation of the battery module throughout its life cycle.

[0009] Specifically, the length and width of the heating film are respectively greater than or equal to the length and width of the battery module.

[0010] Specifically, a positioning hole is provided on the heating film, and a fixing hole corresponding to the positioning hole is provided on the battery module, wherein the positioning hole and the fixing hole can be multiple respectively; the heating film is fixed in the fixing hole through the positioning hole by a pin.

[0011] Specifically, the heating film is a polyimide heating sheet.

[0012] Specifically, the middle buffer fixing pad has compression resilience, wherein the compression amount of the middle buffer fixing pad is 20%-70%.

[0013] Specifically, four vertical edges are bent on the side isolation pad, the height of the vertical edges is equal to the distance from the heating film to the inner wall of the box cover, and the vertical edges are facing away from the heating film. A rectangular filling space is formed between the vertical edges, the side isolation pad and the inner wall of the box cover, and the filler fills the filling space.

[0014] Specifically, the length of the side isolation pad is equal to the length of the battery module, and the side isolation pad is aligned with the battery module in the length direction, the height of the side isolation pad is greater than the height of the heating film, and the bottom end of the side isolation pad is in contact with the battery tray, and the top end of the side isolation pad is flush with the top end of the heating film.

[0015] Specifically, the filler is a foamed non-metallic material.

[0016] Specifically, there may be a plurality of injection holes.

[0017] A second aspect of the utility model provides a battery pack including a battery heating and heat preservation structure, including: a plurality of battery modules, wherein the plurality of battery modules are arranged in the battery heating and heat preservation structure.

[0018] The battery pack of the utility model including the battery heating and heat preservation structure can improve the safety and heat preservation of the battery module as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 This is a schematic diagram of an exploded structure of a battery heating and heat preservation structure according to an embodiment of the utility model;

[0022] Figure 2 It is a structural schematic diagram of a box cover according to an embodiment of the utility model;

[0023] Figure 3 This is a schematic structural diagram of a heating film according to an embodiment of the utility model;

[0024] Figure 4 It is a schematic diagram of the connection structure of the side isolation pad and the vertical edge according to one embodiment of the utility model;

[0025] Figure 5 According to the utility model Figure 4 Schematic diagram of the enlarged structure of area A in the middle.

[0026] As shown in the figure: 1. Box cover; 2. Heating film; 3. Side isolation pad; 4. Middle buffer fixing pad; 5. Filler; 6. Battery module; 7. Battery tray; 11. Injection hole; 21. Positioning hole; 31. Vertical edge. DETAILED DESCRIPTION

[0027] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the scheme of the utility model will be further described below. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] The battery heating and heat preservation structure and the battery pack according to the embodiments of the utility model are described below in conjunction with the accompanying drawings.

[0030] like Figure 1 and Figure 2 As shown, the battery heating and heat preservation structure of the first embodiment of the utility model includes a box cover 1, a heating film 2, a side isolation pad 3, a middle buffer fixing pad 4, a filler 5 and a battery tray 7.

[0031] The box cover 1 is detachably connected to a battery tray 7 for mounting a plurality of battery modules 6 .

[0032] As a possible situation, in order to further improve the firmness and impact resistance of the box cover 1, reinforcing ribs may be provided on the box cover 1, wherein the number of reinforcing ribs may be multiple.

[0033] Injection holes 11 are respectively opened on the two side walls of the box cover 1, and the injection holes 11 are arranged corresponding to the side isolation pads 3. Two symmetrically arranged heating films 2 are detachably connected to the multiple battery modules 6, and two heating films 2 at the edge of the multiple heating films 2 are attached to the side isolation pads 3 on the surface away from the battery module 6.

[0034] It should be noted that, in this embodiment, the two heating films 2 at the edge position refer to the heating films 2 adjacent to the inner wall of the long side of the box cover 1 .

[0035] The filler 5 is filled into the space between the side isolation pad 3 and the box cover 1 through the injection hole 11 .

[0036] It should be noted that in order to ensure the efficiency and convenience of the filling process, the injection hole 11 is preferably a circular hole, and the diameter of the injection hole 11 is between 0.5mm and 10mm. For example, the diameter of the injection hole 11 can be 8mm, 9mm, etc., so as to facilitate the filling of the filler 5 into the space between the side isolation pad 3 and the box cover 1 through the injection hole 11. After the filling 5 is injected, the filling 5 can automatically close the injection hole 11 after quick drying, thereby ensuring the sealing of the entire structure.

[0037] An intermediate buffer fixing pad 4 is arranged between every two adjacent battery modules 6 , and the intermediate buffer fixing pad 4 is in contact with two adjacent heating films 2 .

[0038] It is worth noting that in the process of arranging the intermediate buffer fixing pad 4, firstly, a plurality of battery modules 6 are arranged on the battery tray 7, and the heating film 2 is fixed on the side wall of the battery module 6, and then one of the battery modules 6 is fixed and locked, and then the intermediate buffer fixing pad 4 is placed between the fixed battery module 6 and the adjacent battery module 6, and before the adjacent battery module 6 is fixed, an appropriate force is applied in the direction of the intermediate buffer fixing pad 4 to push the battery module 6, so as to ensure that the intermediate buffer fixing pad 4 is evenly and fully squeezed, thereby pressing the heating film 2 to make it fully contact with the battery module 6. This step is crucial to ensure the reliable attachment of the heating film 2 on the battery module 6. Only after the squeezing of the intermediate buffer fixing pad 4 is completed, the battery module 6 in the squeezing process can be fixed, and then the above installation process is repeated, and the remaining intermediate buffer fixing pads 4 and battery modules 6 are operated in sequence until the last battery module 6 is fixed.

[0039] Specifically, relevant personnel can inject filler 5 into the injection hole 11. After the filler 5 is injected, the side isolation pad 3 will be connected to the box cover 1, and the side isolation pad 3 will be squeezed at the same time, so that the side isolation pad 3 is supported and tightly pressed on the heating film 2, thereby eliminating the gap between the heating film 2 and the battery module 6 that may be caused by dimensional deviation during the assembly process, thereby ensuring full contact between the heating film 2 and the battery module 6 without gaps, which not only greatly improves the heating performance of the battery module 6, but also effectively avoids the risk of dry burning and fire caused by poor contact, ensuring the safe and stable operation of the battery module 6 throughout its life cycle.

[0040] Compared with the single-sided adhesive attachment method of the polyimide heating sheet in the traditional technology, the process of attaching the heating film has high process requirements and low work efficiency. When repairing or dismantling, it is extremely difficult to separate the polyimide heating sheet from the battery, which often causes the polyimide heating sheet to be damaged or even scrapped, which is time-consuming, labor-intensive, and economically loss. In the utility model, if the heating film 2 or the battery module 6 needs to be repaired or dismantled, the battery module 6 or the heating film 2 can be easily disassembled due to the smooth contact design between the side isolation pad 3 and the heating film 2. After the repair is completed, it is only necessary to simply remove the old side isolation pad 3 and part of the filler 5, replace the new side isolation pad 3 and re-inject the filler 5 to quickly restore the device state. The entire repair process saves time and labor, and significantly improves the repair efficiency.

[0041] In one embodiment of the present invention, Figure 1 As shown, the length and width of the heating film 2 are respectively greater than or equal to the length and width of the battery module 6 .

[0042] It should be noted that, please refer to Figure 2 , the L direction is the length of the heating film 2 , and the w direction is the width of the heating film 2 .

[0043] It can be understood that the above design can ensure that the area where the heating film 2 heats the battery module 6 is large enough, thereby improving the heating efficiency of the heating film 2 on the battery module 6 and ensuring the charging and discharging performance of the battery module 6.

[0044] Furthermore, if Figure 3 As shown, a positioning hole 21 is opened on the heating film 2, and a fixing hole corresponding to the positioning hole 21 is opened on the battery module 6, wherein the positioning hole 21 and the fixing hole can be multiple, respectively, and the heating film 2 is fixed in the fixing hole through the positioning hole 21 by a pin.

[0045] Specifically, relevant personnel can fix the heating film 2 on the battery module 6 by passing the pin through the positioning hole 21 and fixing it in the fixing hole, which can further improve the tightness and firmness between the heating film 2 and the battery module 6.

[0046] Furthermore, the heating film 2 can be a polyimide heating plate, wherein it can be understood that the heating film 2 uses a polyimide heating plate, which can have the advantages of fast heating rate and small space occupation, wherein the thickness of the heating film 2 can be in the range of 0.05-2mm, for example, the thickness of the heating film 2 can be 1mm, 1.5mm, etc.

[0047] In one embodiment of the present invention, Figure 1 and Figure 3 As shown, the middle buffer fixing pad 4 has compression resilience, wherein the compression amount of the middle buffer fixing pad 4 is 20%-70%.

[0048] Among them, it can be understood that, since the compression amount of the middle buffer fixed pad 4 can vary between 20% and 70%, for example, the compression amount of the middle buffer fixed pad 4 can be 30%, the middle buffer fixed pad 4 has good buffering properties, so that the middle buffer fixed pad 4 can adapt to impacts of different intensities and frequencies. For example, when subjected to a small impact, the compression amount of the middle buffer fixed pad 4 is small, providing a basic buffering effect; when subjected to a large impact, the pad can be further compressed to absorb the impact energy with a larger deformation, thereby effectively reducing the propagation of force and further improving the service life of the battery module 6.

[0049] It is worth mentioning that the compression resilience of the middle buffer fixing pad 4 means that after the impact, the middle buffer fixing pad 4 can quickly return to its original shape and size. This property helps to maintain the long-term stability and durability of the middle buffer fixing pad 4, and also ensures its continuous protection capability for the battery module 6.

[0050] In addition, the intermediate buffer fixing pad 4 is made of non-metallic insulating and flame-retardant materials, such as polyurethane, which further enhances its protective performance. The polyurethane material not only has good insulation and flame retardancy, but also can effectively prevent the battery module 6 from safety hazards caused by short circuit, overheating, etc. At the same time, its excellent physical properties also ensure the stability and reliability of the intermediate buffer fixing pad 4 in various environments.

[0051] In one embodiment of the present invention, Figure 4 and Figure 5 As shown, four vertical edges 31 are bent on the side isolation pad 3, the height of the vertical edge 31 is equal to the distance from the heating film 2 to the inner wall of the box cover 1, and the vertical edge 31 is facing away from the heating film 2. A rectangular filling space is formed between the vertical edge 31, the side isolation pad 3 and the inner wall of the box cover 1, and the filler 5 fills the filling space.

[0052] Among them, it can be understood that by setting the vertical edge 31 and making the height of the vertical edge 31 equal to the distance from the heating film 2 to the inner wall of the box cover 1, it can ensure that the side isolation pad 3 fits between the heating film 2 and the inner wall of the box cover 1 to form a stable structure, thereby improving the stability of the overall structure, helping to reduce performance degradation or safety hazards caused by position offset, and further improving the close contact between the side isolation pad 3 and the heating film 2.

[0053] In addition, the formed rectangular filling space can provide precise guidance for the injection of the filler 5, so that the filler 5 is evenly and completely filled in the filling space, thereby ensuring close contact between the side isolation pad 3 and the heating film 2, eliminating possible gaps, and at the same time, utilizing the rectangular filling space can also seal and intercept the filler 5, avoiding overflow when injecting the filler 5, reducing the waste of the filler 5 during filling, and thus reducing the filling cost.

[0054] Furthermore, if Figure 1 As shown, the length of the side isolation pad 3 is equal to the length of the battery module 6, and the side isolation pad 3 is aligned with the battery module 6 in the length direction, the height of the side isolation pad 3 is greater than the height of the heating film 2, and the bottom end of the side isolation pad 3 is in contact with the battery tray 7, and the top end of the side isolation pad 3 is flush with the top end of the heating film 2.

[0055] It can be understood that the above arrangement enables the side isolation pad 3 to completely cover the contact area between the heating film 2 and the battery module 6, which not only improves the tightness between the heating film 2 and the battery module 6, but also helps to prevent heat loss, thereby improving the heating performance and efficiency of the battery module 6. The thickness of the side isolation pad 3 is 0.1mm-5mm. For example, the thickness of the side isolation pad 3 in this embodiment can be 0.5mm, and the side isolation pad 3 is a non-metallic flame retardant and insulating material. For example, PP can be selected in this embodiment, which has excellent flame retardant properties and can maintain structural stability in high temperature environments to prevent fires. At the same time, it also has good insulation properties, which can effectively isolate the electrical connection between the battery module 6 and other metal parts to prevent electrical accidents such as short circuits. Thereby improving the safety of the battery heating and insulation structure.

[0056] In one embodiment of the present invention, Figure 1 As shown, the filler 5 is a foamed non-metallic material.

[0057] It can be understood that by selecting the filler 5 as a foamed non-metallic material, a tight foam layer can be formed in the rectangular filling space, thereby effectively squeezing the side isolation pad 3 and the heating film 2 to ensure that any gap between the heating film 2 and the battery module 6 is eliminated, thereby enhancing the sealing between the two.

[0058] Specifically, the foamed non-metallic material can be polystyrene foam, polyurethane foam, etc., preferably polyurethane foam, and has a thermal conductivity of <0.5W / m·k, and has an excellent thermal insulation effect, thereby improving the thermal insulation performance of the battery heating and insulation structure.

[0059] In one embodiment of the present invention, Figure 2 As shown, there may be a plurality of injection holes 11 .

[0060] It can be understood that by setting a plurality of injection holes 11, not only the injection filling speed of the filler 5 can be increased, making the entire operation process more efficient; but also injection from multiple positions is allowed simultaneously, effectively ensuring that the filler 5 can be evenly distributed and completely fill the entire filling space, which not only improves work efficiency, but also ensures the uniformity and integrity of the filler 5.

[0061] The battery pack including the battery heating and heat preservation structure according to the second aspect of the embodiment of the utility model comprises: a plurality of battery modules 6, wherein the plurality of battery modules 6 are all arranged in the battery heating and heat preservation structure.

[0062] According to the battery pack including the battery heating and heat preservation structure of the utility model, by providing the above-mentioned battery heating and heat preservation structure, the safety and heat preservation of the battery module 6 as a whole can be improved.

[0063] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0064] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery heating and heat preservation structure, characterized in that: It includes a box cover, a heating film, a side isolation pad, a middle buffer fixed pad, a filler and a battery tray, among which: The box cover is detachably connected to the battery tray for mounting a plurality of battery modules; Injection holes are respectively provided on the two side walls of the box cover, and the injection holes are arranged corresponding to the side isolation pads; Two symmetrically arranged heating films are detachably connected to each of the plurality of battery modules, and the side isolation pads are attached to the surfaces of two of the plurality of heating films at the edge away from the battery module; The filler is filled into the space between the side isolation pad and the box cover through the injection hole; The intermediate buffer fixing pad is arranged between each two adjacent battery modules, and the intermediate buffer fixing pad is in contact with the two adjacent heating films.

2. The battery heating and heat preservation structure according to claim 1, characterized in that: The length and width of the heating film are respectively greater than or equal to the length and width of the battery module.

3. The battery heating and heat preservation structure according to claim 1, characterized in that: The heating film is provided with a positioning hole, and the battery module is provided with a fixing hole corresponding to the positioning hole, wherein the positioning hole and the fixing hole can be multiple respectively; The heating film is fixed in the fixing hole through the positioning hole by a pin.

4. The battery heating and heat preservation structure according to claim 1, characterized in that: The heating film is a polyimide heating film.

5. The battery heating and heat preservation structure according to claim 1, characterized in that: The middle buffer fixing pad has compression resilience, wherein the compression amount of the middle buffer fixing pad is 20%-70%.

6. The battery heating and heat preservation structure according to claim 1, characterized in that: The side isolation pad is also bent with four vertical edges, the height of the vertical edges is equal to the distance from the heating film to the inner wall of the box cover, and the vertical edges are facing away from the heating film. A rectangular filling space is formed between the vertical edges, the side isolation pad and the inner wall of the box cover, and the filler fills the filling space.

7. The battery heating and heat preservation structure according to claim 1, characterized in that: The length of the side isolation pad is equal to the length of the battery module, and the side isolation pad is aligned with the battery module in the length direction, the height of the side isolation pad is greater than the height of the heating film, and the bottom end of the side isolation pad is in contact with the battery tray, and the top end of the side isolation pad is flush with the top end of the heating film.

8. The battery heating and heat preservation structure according to claim 1, characterized in that: The filler is a foamed non-metal material.

9. The battery heating and heat preservation structure according to claim 1, characterized in that: There may be a plurality of injection holes.

10. A battery pack comprising the battery heating and heat preservation structure according to any one of claims 1 to 9, characterized in that: include: A plurality of battery modules, wherein the plurality of battery modules are arranged in the battery heating and heat preservation structure.

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