Insulation structure and secondary battery

Abstract

To provide an insulation structure, a secondary battery, and a battery pack.SOLUTION: An insulation structure, a secondary battery, and a battery pack include a first insulation member 1 having a bottom surface covering region 2 and a side surface covering region 3. The side surface covering region is located on the same side as the bottom surface covering region to form an accommodation space. The side surface covering region includes two opposite first side surface covering regions 31 and two opposite second side surface covering regions. At least one of the two opposite first side surface covering regions includes: a central overlapping region 310; a first side surface overlapping region 320; and a second side surface overlapping region 330. The insulation structure and the secondary battery achieve insulation wrapping of the first side surface covering region on three overlapping regions by folding and covering the three overlapping regions.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the technical field of batteries, and in particular to an insulating structure and a secondary battery. [Background technology]

[0002] In the new energy battery manufacturing field, in order to reduce metal scraping inside the casing and avoid the risk of internal short circuit in lithium batteries, currently most manufacturers are replacing tab die-cutting with full tab type batteries.

[0003] Traditional insulating materials (e.g. Mylar sheets) have gaps at the bottom when folded. When the battery cell is a full-tab battery cell, it is very likely to contact the bottom of the housing, which creates a risk of short circuit insulation.

[0004] In order to overcome the short circuit insulation risk that may occur in the bottom gap, a multi-layer insulating material is usually adopted to cover the bottom gap, however, such a multi-layer insulating material increases the overall thickness and length of the electrode assembly of the battery cell at the covered location, which affects the assembly and use of the battery. Summary of the Invention [Problem to be solved by the invention]

[0005] The technical problem to be solved by the present invention is to provide an insulating structure and a secondary battery capable of overcoming the defects of the related art, namely, the poor insulating wrapping of the electrode assembly, which increases the thickness of the battery when completely coated. [Means for solving the problem]

[0006] The present invention solves the above technical problems through the following technical solutions.

[0007] The insulating structure of the present invention includes a first insulating member, which includes a bottom covering region and a side covering region located on the same side as the bottom covering region and forming an accommodating space.

[0008] The side covering regions include two opposing first side covering regions and two opposing second side covering regions.

[0009] At least one of the two opposing first side covering regions includes a central overlap region formed by stretching the bottom covering region, a first side overlap region formed by stretching one of the two opposing first side covering regions, and a second side overlap region formed by stretching the other of the two opposing first side covering regions.

[0010] Two of the central overlap region, the first side overlap region, and the second side overlap region do not overlap one another, and the other of the central overlap region, the first side overlap region, and the second side overlap region at least partially covers an area between the two non-overlapping regions.

[0011] In this method, the insulating wrapping of the first side covering region is realized on the three overlapping regions by folding and covering the three overlapping regions (the central overlapping region, the first side overlapping region, and the second side overlapping region). Two of the three overlapping regions do not overlap with each other, and the other overlapping region at least partially covers the region between the two non-overlapping regions, so that the other overlapping region can cover the edge gap formed by the folded overlapping region of the two non-overlapping regions, thereby improving the insulating effect of the cladding on the three overlapping sides. At the same time, the two non-overlapping regions of the three overlapping regions can make the first side covering region cover a one-layer insulating structure, and the other of the three overlapping regions can make the first side covering region have a structure with at most two insulating layers. In this way, the thickness of the battery cell is not increased, and the space utilization rate can be improved.

[0012] Preferably, two edges of the central overlap region, the first side overlap region, and the second side overlap region are joined to form a junction, and another of the central overlap region, the first side overlap region, and the second side overlap region at least partially covers the junction.

[0013] In this solution, the method of connecting the edges ensures that two of the three overlapping regions (the central overlapping region, the first side overlapping region, and the second side overlapping region) do not overlap, making it easier to cut the first insulating member, and therefore the accuracy of the cutting can be easily controlled. In this way, the gap of the edges formed after the connection can be made as small as possible, improving the insulating effect of the edges of the joint. At the same time, it can be ensured that the thickness of the first side covering region is not increased by the two overlapping regions forming the joint. Since the joint is at least partially covered by the other one of the three overlapping regions, the gap of the connected edges is covered, and the insulating effect of the gap of the connected edges can be improved.

[0014] Preferably, the shape of the joint is one of a straight line, a curve, and a stepped shape.

[0015] In this method, the shape of the joint can be one of straight lines, curves, or steps, which makes cutting easier and makes it easier to control the edges of the two overlapping areas that form the joint to match, thereby reducing errors.

[0016] Preferably, one of the first side overlap region and the second side overlap region is connected to an edge of the central overlap region to form a junction.

[0017] In this solution, one of the first side overlap region or the second side overlap region is adopted to connect with the edge of the central overlap region to form a joint, so that the joint is only on one side of the central overlap region and the joint can be formed by only cutting one side, thus reducing the process. The other of the first side overlap region and the second side overlap region is folded to cover the other side of the central overlap region, so that the insulation effect can be ensured at the edge on the other side.

[0018] Preferably, edges of the first side overlap region and the second side overlap region are joined to form a junction.

[0019] In this method, the edges of the first side overlap region and the second side overlap region are joined to form a joint, so there is no need to cut the central overlap region, and the folded edges of the central overlap region and the bottom covering region can be insulated as they are.

[0020] Preferably, a transition gap is provided at the junction of the central overlap region, the bottom covering region, and the second side covering region.

[0021] In this solution, a transition gap is provided at the junction of the central overlap region, the bottom covering region, and the second side covering region, so that the three overlap regions (the central overlap region, the first side overlap region, and the second side overlap region) can be easily folded at the transition gap, thereby preventing the first insulating member from cracking due to stress at the junction, and avoiding the risk of electrical leakage.

[0022] Preferably, the first insulating member is integrally molded.

[0023] In this solution, the first insulating member is integrally molded, so that the first insulating member can be easily processed and the insulation risks caused by separation and splicing can be avoided.

[0024] Preferably, the insulating structure further includes a second insulating member, which covers the gap at the edge of the joint.

[0025] In this method, the gaps at the edges of the joint are covered by the second insulating material, so that the edge gaps generated by non-overlapping joints can be covered by the second insulating material, thereby ensuring complete insulation effect at each edge of the joint.

[0026] Preferably, the insulating structure further includes a fixing portion, which connects another one of the central overlapping region, the first side overlapping region, and the second side overlapping region with the two opposing second side covering regions.

[0027] In this solution, another of the three overlapping areas (central overlapping area, first side overlapping area, and second side overlapping area) is connected to the two opposing second side covering areas by a fixing part, and the two opposing second side covering areas are fixed to the other covering areas to form a storage space, so that even after folding, the three overlapping areas (bottom covering area, first side covering area, and second side covering area) have connection strength, ensuring the stability of the storage space.

[0028] Preferably, the insulating structure further includes a third insulating member, which covers at least a portion of the upper region of the accommodating space and at least partially overlaps with the side covering region.

[0029] In this solution, the insulating effect of the upper region is achieved by the third insulating member of the above structure, and the insulating effect is achieved by the folded edge of the third insulating member folded toward the side covering region, thereby improving the insulating effect of the overall insulating structure in each covering region. By making the third insulating member at least partially overlap the side covering region, it is also possible to avoid the situation where the third insulating member is too long to be flush with the side covering region.

[0030] Preferably, the third insulating member covers a region corresponding to the explosion-proof valve.

[0031] In this solution, the area corresponding to the explosion-proof valve is covered with the third insulating member, so that the explosion-proof valve area is insulated and safety can be ensured.

[0032] Preferably, the material of the third insulating member includes a colloid.

[0033] In this solution, since the material of the third insulating member contains colloid, the third insulating member has adhesiveness and can be connected to the side covering area, thereby achieving a better fixing effect.

[0034] Preferably, a containment space is employed to cover the electrode assembly.

[0035] In this solution, the receiving space is used to cover the electrode assembly, so that each covering surface and the joint edge of the electrode assembly are insulated and protected, and the risk of electrical leakage can be avoided.

[0036] The secondary battery of the present invention includes an electrode assembly, a housing, a top cover assembly, and the insulating structure described above.

[0037] The housing has an opening, the electrode assembly is received within the housing, and the top cover assembly is connected to the housing and covers the opening in the housing.

[0038] An insulating structure covers the outside of the electrode assembly.

[0039] In this solution, the above-mentioned insulating structure is adopted to cover the outside of the electrode assembly and isolate the housing from the electrode assembly, so that the insulating effect between the covered surface and edge of the electrode assembly and the housing can be improved to avoid the risk of short circuit, and the thickness of the electrode assembly is not increased in the first side covering region, which does not affect the subsequent configuration requirements of the secondary battery.

[0040] The battery pack of the present invention includes: A box body, the above-mentioned secondary battery, and a cover that covers an opening of the box body and forms a closed space together with the space of the box body to house the secondary battery. Effect of the Invention

[0041] The beneficial effect of the present invention is that by folding and covering three overlapping regions (the central overlapping region, the first side overlapping region, and the second side overlapping region), the insulating structure and the secondary battery realize the insulating wrapping of the first side covering region on the three overlapping regions. Since two of the three overlapping regions do not overlap each other, and the other covers at least the region between the two regions that do not overlap each other, the other overlapping region can cover the edge gap formed by the two non-overlapping overlapping regions during the non-overlapping folding, thereby improving the insulating effect of the cladding on the three overlapping regions. At the same time, the two non-overlapping regions of the three overlapping regions can make the first side covering region cover one layer of insulating structure, and the other of the three overlapping regions can make the first side covering region have a structure with at most two insulating layers. In this way, the thickness of the battery cell is not increased, and the space utilization rate can be improved. [Brief description of the drawings]

[0042] [Figure 1] 1 is a schematic diagram of a planarized structure of a first insulating member according to a first embodiment of the present invention. [Figure 2A] FIG. 2 is a schematic structural diagram of the electrode assembly covered by the first insulating member during the folding process in embodiment 1 of the present invention. [Figure 2B] FIG. 2 is another schematic structural diagram of the electrode assembly covered by the first insulating member during the folding process in embodiment 1 of the present invention; [Figure 2C] FIG. 1 is a schematic structural diagram of an insulating structure according to a first embodiment of the present invention. [Figure 3A] FIG. 2 is a schematic diagram of the bottom partial structure during the folding process of the first insulating member of embodiment 1 of the present invention; [Figure 3B]FIG. 2 is a schematic diagram of a partial structure of the bottom portion after folding of the first insulating member in embodiment 1 of the present invention is completed. [Figure 3C] FIG. 2 is an enlarged schematic view of a portion A in FIG. [Figure 4] 1A to 1C are schematic diagrams showing the structural states of the electrode assembly covered by the first insulating member in each step of the folding process in embodiment 1 of the present invention (not including the covering of the second insulating member and the adhesion of the fixing part). [Diagram 5] FIG. 4 is a schematic structural diagram of a secondary battery according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0043] The present invention will be described more clearly and completely below with reference to the accompanying drawings, which are provided as preferred embodiments.

[0044] (Embodiment 1) As shown in FIG. 1 and FIG. 2A to FIG. 2C, the present embodiment provides an insulating structure 100, which includes a first insulating member 1, which is specifically an insulating film, and its material is Mylar (PET polyester thin film). This insulating film material is also called Mylar film or Mylar sheet. Of course, there are many insulating materials, and in other embodiments, the first insulating member may use other insulating materials.

[0045] The first insulating member 1 includes a bottom covering region 2 and a side covering region 3, and the side covering region 3 is located on the same side as the bottom covering region 2 and forms an accommodating space 4.

[0046] The side covering regions include two opposing first side covering regions 31 and two opposing second side covering regions 32 .

[0047] The two opposing first side covering regions 31 include a central overlap region 310, a first side overlap region 320, and a second side overlap region 330. The central overlap region 310 is formed by stretching the bottom covering region 2, the first side overlap region 320 is formed by stretching one of the two opposing first side covering regions 31, and the second side overlap region 330 is formed by stretching the other of the two opposing first side covering regions 31.

[0048] Two of the central overlap region 310, the first side overlap region 320, and the second side overlap region 330 do not overlap one another, and the other of the central overlap region 310, the first side overlap region 320, and the second side overlap region 330 covers the area between the two non-overlapping regions.

[0049] In the insulating structure 100, three overlapping regions (the central overlapping region 310, the first side overlapping region 320, and the second side overlapping region 330) are stretched and formed to realize the insulating wrapping of the first side covering region 31 on the three overlapping regions. Two of the three overlapping regions do not overlap with each other, and the other covers the region between the two non-overlapping regions, so that the other overlapping region can cover the edge gap formed by the folded overlapping region of the two non-overlapping regions, thereby improving the insulating effect of the cladding on the three overlapping regions. At the same time, the two non-overlapping regions make the first side covering region 31 cover one layer of insulating structure, and the other of the three overlapping regions can make the first side covering region 31 have a structure with at most two insulating layers. In this way, the thickness of the battery cell is not increased, and the space utilization rate can be improved. In this way, it is realized that the thickness of the battery on the overlapping covered region is not increased, and the subsequent dimension requirements of the battery assembly can be ensured.

[0050] The accommodation space 4 is configured to cover the electrode assembly 21. That is, the insulating structure 100 covers the electrode assembly 21 in such accommodation space 4, so that each covering surface and joint edge of the electrode assembly 21 are isolated from the external housing, thereby providing insulation protection and avoiding the risk of short circuit.

[0051] In another embodiment, not all surfaces need to be insulated, and instead of both first side covering regions 31 having three overlapping regions, only one first side covering region 31 may have three overlapping regions. Thus, the positions of the three overlapping regions can be adjusted correspondingly according to the needs of the insulating wrapping. Also, the three overlapping regions may be cut in the second side covering region 32 according to the needs of the object to be insulated.

[0052] Specifically, as shown in FIG. 1 and FIG. 2a-FIG. 2c, two of the three overlapping regions, i.e., the central overlapping region 310 and the first side overlapping region 320, are cut at the junction to form a large-area gap 5. After the two overlapping regions are folded, their edges are connected to form a junction 6. The other of the three overlapping regions, i.e., the second side overlapping region 330, is cut at the junction between the second side overlapping region 330 and the central overlapping region 310 to form a thin strip-shaped gap 7, so that the second side overlapping region 330 can be folded to cover the junction 6.

[0053] In such an embodiment, two of the three overlapping regions do not overlap by the method of edge bonding, so that the first insulating member 1 can be easily cut and the cutting accuracy can be easily controlled. In this way, the gap of the edge formed after connection can be made as small as possible, and the insulating effect of the edge of the joint 6 can be improved. In addition, the joint 6 exists only on one side of the central overlapping region 310 (i.e., the side close to the first side overlapping region 320), and the joint 6 can be formed by only cutting one side, so that the operation steps can be reduced. After folding the second side overlapping region 330, the second side overlapping region 330 covers the other side of the central overlapping region 310 (i.e., the side close to the second side overlapping region 330), so that the insulating effect of the edge of the other side can be ensured. At the same time, it can also be ensured that the thickness of the first side covering region 31 is not increased by the two overlapping regions forming the joint 6.

[0054] Since the joint 6 is covered by another one of the three overlapping regions, the connected edge gap is covered, and the insulating effect of the connected edge gap can be improved.

[0055] In another embodiment, which two of the three overlapping regions are selected to be joined to form the joint 6, and the remaining one covers the joint 6, can be freely combined and adjusted according to actual needs. For example, two gaps 5 having matching sizes and shapes may be cut out in the first side overlapping region 320 and the second side overlapping region 330, respectively. In this way, after folding the first side overlapping region 320 and the second side overlapping region 330, their edges are joined to form the joint 6. Since the joint 6 is formed by joining the edges of the first side overlapping region 320 and the second side overlapping region 330, there is no need to cut the central overlapping region 310, and the folded edges of the central overlapping region 310 and the bottom covering region 2 can be insulated as they are.

[0056] Besides realizing the non-overlap by the method of edge bonding, in another embodiment, other structures may be adopted that can realize the non-overlap due to the difference between the insulating materials or the difference between the shapes and structures of the objects to be insulated. Due to the shape and size of the gap formed by the non-overlap area, the edge gap between the non-overlap area by another one of the three overlap areas has a different coverage. In this example, it is a preferred implementation method that the joint 6 is covered by the second side overlap area 330 to close the connected edge gap, which can cover the edge gap to the maximum extent and improve the insulation effect.

[0057] 1 and 3a, the shape of the joint 6 is stepped, and in a flat state, the joint 6 appears as a convex gap 5. A part of the gap 5 is located in the central overlap region 310, and another part is located in the first side overlap region 320. After the central overlap region 310 and the first side overlap region 320 are folded, respectively, the edge of the gap 5, i.e., the central overlap region 310, is joined with the edge of the first side overlap region 320 to form the joint 6.

[0058] In another embodiment, the shape of the joint 6 can be adjusted accordingly according to the needs of the joining effect. Preferably, the shape of the joint 6 is one of straight line, curved line, and stepped, so that it is easy to cut and easy to control the edges of the two overlapping regions forming the joint 6 to match, which can reduce errors.

[0059] As shown in FIG. 3c, a transition gap 8 is provided at the junction of the central overlap region 310, the bottom covering region 2, and the second side covering region 32. Specifically, the transition gap 8 is a small arc-shaped gap with a radius R of 0.5 mm. By providing such a transition gap 8, the three overlap regions can be easily folded at the transition gap 8, and the occurrence of stress at the junction and cracks in the first insulating member can be avoided. If a crack occurs, there is a risk of electrical leakage at this junction, so the risk of electrical leakage can be avoided through the transition gap 8.

[0060] As shown in Fig. 1, after the first insulating member 1 is spread, each covering area is a complete overall plane. Therefore, since the first insulating member 1 is integrally molded, the first insulating member 1 is easy to process and the insulation risk due to separation and splicing can be avoided.

[0061] As shown in Fig. 2c and Fig. 3b, the insulating structure 100 further includes a second insulating member 9, specifically an insulating tape. In the above description, the extension length of the second side overlapping region 330 is just equal to the width of the folded side of the central overlapping region 310, and there is no excess part beyond the joint edge between the central overlapping region 310 and the second side covering region, so there is also a small cross-sectional non-closed gap 10 near the bottom edge of the central overlapping region 310 in the joint 6, thereby causing a potential risk of non-insulation. Therefore, the second insulating member covers the edge gap of the joint 6 and tightly closes this small cross-sectional non-closed gap 10, thereby ensuring the complete insulating effect of each edge of the joint 6.

[0062] In another embodiment, the second insulating member 9 may not be necessary by using a different shape of the joint 6 or other non-overlapping structure, or by allowing the extension length of the second side overlap region 330 to extend beyond the joint edge between the central overlap region 310 and the second side covering region 32 to close the small cross-sectional non-closed gap.

[0063] 2c, the insulating structure 100 further includes a fixing part 11, specifically a kind of adhesive tape, which connects the second side overlapping region 330 and the two opposing second side covering regions 32. Another one of the three overlapping regions (in this embodiment, the other one refers to the second side overlapping region 330) is connected to the two opposing second side covering regions 32 by the fixing part, and the two opposing second side covering regions 32 are fixed to the other covering region to form the storage space 4, so that the three overlapping regions have connection strength even after being folded, and the stability of the storage space 4 can be ensured.

[0064] As shown in Fig. 4, this figure is a schematic diagram of a specific folding step of a Mylar sheet. The figure shows the steps of the whole process starting from a cut and flattened Mylar sheet, folding each covering area and each overlapping area until the electrode assembly is cracked, and the state of the insulating structure 100 at the end of each step (the steps in the figure do not include wrapping the second insulating member 9 and bonding the fixing part 11, which can be derived with reference to Fig. 2c).

[0065] (Embodiment 2) This embodiment provides another insulating structure 100, which is substantially the same as the insulating structure 100 of the first embodiment, with the following differences:

[0066] The insulating structure 100 further includes a third insulating part, which is a part of the entire Mylar sheet, and its surface is covered with colloid and has adhesiveness. The third insulating member covers at least a part of the upper region of the receiving space 4 and partially overlaps with the side covering region 3. That is, in this implementation, the third insulating member does not completely cover the upper region, and after folding the third insulating member, the area covered by the side covering region 3 is only a small part, not all. In this way, it can be avoided that the third insulating member is too long and cannot be leveled with the side covering region 3. In this embodiment, the length of the third insulating member is relatively short, so that the third insulating member can be leveled with the side covering region 3 to obtain a better fixing effect. It should be understood that in another embodiment, the third insulating member may cover the entire upper region. In this embodiment, the insulating effect of the upper region is achieved through the third insulating member having the above structure, and the folded edge of the third insulating member folded toward the side covering region can also achieve the insulating effect, thereby improving the insulating effect of the entire insulating structure 100 in each covering region.

[0067] In this embodiment, the third insulating member is present at least in the central portion of the upper part, i.e., in the area below the explosion-proof valve, thereby insulating the area corresponding to the explosion-proof valve, preventing leakage of electrolyte and further improving safety.

[0068] In another embodiment, according to different placement areas of the explosion-proof valve, the position of the third insulating member is adjusted accordingly.

[0069] (Embodiment 3) 5, the present embodiment provides a secondary battery 20, which is also a rechargeable battery. The secondary battery 20 includes an electrode assembly 21, a housing (not shown), a top cover assembly 22, and the insulating structure 100 shown in the first embodiment.

[0070] The housing has an opening (not shown), and the electrode assembly 21 is accommodated in the housing. The top cover assembly 22 is connected to the housing and covers the opening of the housing. An explosion-proof valve 23 is installed in the central area of ​​the top cover assembly 22, and an insulating structure 100 covers the outside of the electrode assembly 21. That is, by providing an insulating film between the housing and the electrode assembly 21 and arranging the housing and the electrode assembly at a distance, the insulating effect between the coated surface and edge of the electrode assembly and the housing can be improved, thereby avoiding the risk of short circuit. At the same time, the thickness of the electrode assembly in the first side covering area 31 is not increased, which does not affect the subsequent configuration requirements of the secondary battery.

[0071] (Embodiment 4) This embodiment also provides a battery pack, which includes a box, the secondary battery described in embodiment 3, and a cover, and the cover covers an opening of the box and forms a closed space with the space of the box to accommodate the secondary battery.

[0072] Although specific embodiments of the present invention have been described above, those skilled in the art can understand that these are merely examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, and all of these changes and modifications are included in the protection scope of the present invention. [Industrial Applicability]

[0073] The present invention provides a secondary battery and insulating structure that can overcome the defects of poor insulating wrapping of electrode assemblies, which increases the thickness of the battery when completely coated. [Explanation of symbols]

[0074] 100 Insulation structure 1 First insulating member 2 Bottom coverage area 3 Side coverage area 4. Containment Space 31 1st side covering area 310 Central overlap area 320 1st side overlap area 330 Second side overlap area 32 Second side covering area 5. Gap 6 Joint 7. Zonal Gap 8 Transition Gap 9 Second insulating member 10 Unclosing Gap 11 Fixed part 20 Secondary battery 21 Electrode Assembly 22 Top Cover Assembly 23 Explosion-proof valve

Claims

1. An insulating structure including a first insulating member, the first insulating member including a bottom covering region and a side covering region located on the same side as the bottom covering region and forming an accommodation space, the side covering region includes two opposing first side covering regions and two opposing second side covering regions; At least one of the two opposing first side covering regions includes a central overlap region formed by extending the bottom covering region, a first side overlap region formed by extending one of the two opposing first side covering regions, and a second side overlap region formed by extending the other of the two opposing first side covering regions; two of the central overlap region, the first side overlap region, and the second side overlap region do not overlap one another, and another of the central overlap region, the first side overlap region, and the second side overlap region at least partially covers an area between the two non-overlapping regions; The three overlapping regions overlying the first side covering region form an insulating structure having a maximum of two layers.

2. 2. The insulating structure of claim 1, wherein two edges of the central overlap region, the first side overlap region, and the second side overlap region are joined to form a junction, and another of the central overlap region, the first side overlap region, and the second side overlap region at least partially covers the junction.

3. 3. The insulating structure of claim 2, wherein the joint has a straight line shape.

4. 4. The insulating structure of claim 3, wherein the joint has a stepped shape.

5. 3. The insulating structure of claim 2, wherein the joint is curved in shape.

6. The isolation structure of claim 2 , wherein one of the first side overlap region and the second side overlap region is connected to an edge of the central overlap region to form the junction.

7. The insulating structure of claim 2 , wherein edges of the first side overlap region and the second side overlap region are joined to form the junction.

8. The insulating structure of claim 1 , wherein a transition gap is provided at a junction of the central overlap region, the bottom covering region, and the second side covering region.

9. The insulating structure of claim 1 , wherein the first insulating member is integrally molded.

10. The insulating structure of claim 2 , further comprising a second insulating member, the second insulating member covering a gap at an edge of the joint.

11. 2. The insulating structure of claim 1, further comprising a fixing portion, the fixing portion connecting another one of the central overlap region, the first side overlap region, and the second side overlap region to the two opposing second side covering regions.

12. The insulating structure according to claim 1 , further comprising a third insulating member, the third insulating member covering at least a portion of the upper region of the accommodating space and at least partially overlapping the side covering region.

13. The insulating structure according to claim 12 , wherein the third insulating member covers an area corresponding to an explosion-proof valve.

14. The insulating structure of claim 12 , wherein the material of the third insulating member comprises a colloid.

15. The insulating structure of claim 1 , wherein the containing space is configured to cover an electrode assembly.

16. A secondary battery comprising an electrode assembly, a housing, a top cover assembly, and the insulating structure according to claim 1, the housing has an opening, the electrode assembly is housed within the housing, and the top cover assembly is connected to the housing and covers the opening of the housing; The insulating structure covers the outside of the electrode assembly.

17. A box body and The secondary battery according to claim 16 ; a cover that covers an opening of the box body, forms a closed space together with the space of the box body, and houses the secondary battery; Including battery pack.

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