A single cell battery

Abstract

This application discloses a single-cell battery, including a casing. A terminal post is disposed on the first wall of the casing, and the first wall is covered with an insulating plate. The terminal post passes through the insulating plate. A group of through holes is formed on the insulating plate. The sum of the areas of the through holes is S1, the area of ​​the first wall is S2, and the minimum distance from the through holes to the terminal post is d. Therefore, the range of S1 / (S2×d) is 0.015 mm. ‑1 -0.18mm ‑1 This disclosure uses an insulating plate to cover the first wall to improve the insulation effect between the pole and the housing, reducing the risk of short circuit. Simultaneously, the insulating plate has a group of through holes to assist in heat dissipation of the first wall, and the range of S1 / (S2×d) is limited to 0.015 mm. ‑1 -0.18mm ‑1 This ensures that the opening area of ​​the through-hole group matches the area of ​​the first wall to meet the heat dissipation requirements, and that the insulation effect between the pole and the shell is not affected by the excessively large opening area of ​​the through-hole group or its proximity to the pole.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a single-cell battery. Background Technology

[0002] Individual batteries are at risk of thermal runaway during use, and installing an insulating structure on the side wall of the battery casing will further affect its heat dissipation and increase its risk of thermal runaway.

[0003] Therefore, how to meet the insulation and heat dissipation requirements of the battery wall and improve the safety of battery use is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a single cell to meet the insulation and heat dissipation requirements of the battery wall and improve the safety of the battery during use.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A single-cell battery includes a casing. A terminal post is disposed on the first wall of the casing, and the first wall is covered with an insulating plate through which the terminal post passes. A group of through holes is formed on the insulating plate. The sum of the areas of the through holes is S1, the area of ​​the first wall is S2, and the minimum distance from the through holes to the terminal post is d. Therefore, the range of S1 / (S2×d) is 0.015 mm. -1 -0.18mm -1 .

[0007] As can be seen from the above technical solution, one aspect of this disclosure provides a single-cell battery, which includes a casing. A terminal post is disposed on the first wall of the casing. To meet the insulation requirements of the first wall and reduce the risk of short circuits, an insulating plate is covered on the first wall. The terminal post passes through the insulating plate for external electrical connection. Furthermore, a group of through holes is formed on the insulating plate. The group of through holes is a combination of one or more through holes that penetrate the insulating plate in the thickness direction to directly dissipate heat from the first wall, thereby optimizing the heat dissipation effect of the casing. To balance the heat dissipation and insulation effects of the insulating plate, the sum of the areas of the through hole group is S1, and the area of ​​the first wall is S2. The minimum distance d between the several openings of the through hole group and the terminal post limits the range of S1 / (S2×d) to 0.015mm. -1 -0.18mm -1 It should be noted that by limiting the range of S1 / (S2×d), it is ensured that it will not be less than 0.015mm. -1 This is to meet the heat dissipation requirements of the first wall area, while ensuring that it does not exceed 0.18mm. -1This ensures the battery's safety during use, as the opening area of ​​the through-hole group is not too large or too close to the terminal post, thus preventing any impact on the insulation between the terminal post and the casing. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of a single battery structure provided in an embodiment of the present invention;

[0010] Figure 2 An exploded view of a single battery component provided in an embodiment of this utility model;

[0011] Figure 3 This is a top view schematic diagram of a single battery cell provided in an embodiment of the present invention;

[0012] Figure 4 This is a top view of a single battery cell provided in another embodiment of the present invention;

[0013] Figure 5 A top view of a single battery cell provided for other embodiments of this utility model;

[0014] Figure 6 A top view of a single battery provided for other embodiments of this utility model;

[0015] Figure 7 This is a schematic diagram showing the distance between the through-hole group and the edge of the first wall according to an embodiment of the present invention;

[0016] Figure 8 This is a schematic diagram of the assembly of the periphery through holes and the insulating film provided in one embodiment of the present invention.

[0017] in:

[0018] 10-Shell; 20-First wall; 210-Positive terminal post; 220-Negative terminal post; 30-Insulating plate; 310-Through hole group; 320-First through hole; 330-Second through hole; 40-Insulating film. Detailed Implementation

[0019] The core of this application is to disclose a single-cell battery to meet the insulation and heat dissipation requirements of the battery wall and improve the safety of the battery during use.

[0020] To enable those skilled in the art to better understand the present application, embodiments of the present application will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model described in the claims. Additionally, the complete content of the structures represented in the following embodiments is not limited to those necessary for the solution of the utility model described in the claims.

[0021] like Figure 1 and Figure 2 As shown, one aspect of this disclosure provides a single-cell battery, which includes a housing 10, and a terminal post is disposed on the first wall 20 of the housing 10. The terminal post is used to conduct current to connect the single-cell battery to an external circuit. In order to ensure the electrical insulation effect between the terminal post and the first wall 20 and to prevent short circuit faults, an insulating plate 30 is covered on the first wall 20. The insulating plate 30 has good insulation performance and a certain mechanical strength, so as to isolate the electrical connection between the terminal post and the housing 10 and provide a certain strength protection. At the same time, the terminal post is disposed through the insulating plate 30, so that the terminal post can be connected to the external circuit while ensuring insulation.

[0022] Based on the above structure, in order to reduce the obstruction of heat dissipation on the first wall 20 by the insulating plate 30, this disclosure also provides a through-hole group 310 on the insulating plate 30. The through-hole group 310 is a combination of one or more through holes that penetrate the insulating plate 30 in the thickness direction, so as to directly dissipate heat from the first wall 20 and optimize the heat dissipation effect of the housing 10. At the same time, in order to balance the heat dissipation and insulation effect of the insulating plate 30, the sum of the opening areas of the through-hole group 310 is S1, the area of ​​the first wall 20 is S2, and the minimum distance from the several opening structures of the through-hole group 310 to the pole post is d. Therefore, the range of S1 / (S2×d) is limited to 0.015mm. -1 -0.18mm -1 It should also be noted that the minimum value of S1 / (S2×d) is not less than 0.015mm. -1 Specifically, the range of S1 is 1000mm. 2 -3000mm 2 Specifically, it can be 1000mm 2 2000mm 2 3000mm 2 The range of S2 is 2500mm. 2 -14000mm 2 Specifically, it can be 2500mm 2 7000mm 2 10000mm 2 14000mm 2Meanwhile, d ranges from 2mm to 10mm, specifically 2mm, 3mm, 5mm, 7mm, 8mm, and 10mm. By limiting the range of S1 / (S2×d), it is less than 0.015mm. -1 This leads to insufficient heat dissipation in the first wall area 20, preventing heat from dissipating effectively from around the terminals. As a result, heat generated by the individual cells accumulates during operation, reducing battery performance and lifespan. Furthermore, its thickness exceeds 0.18mm. -1 This will result in insufficient insulation on the insulating plate 30, and create a significant risk of short circuit between the pole on the first wall 20 and the housing 10.

[0023] For the single battery provided in the embodiments of this disclosure, the through-hole group 310 on the insulating plate 30 can be freely arranged, as long as its opening area and safe distance from the terminal post are maintained. In some embodiments of this disclosure, such as... Figure 3 As shown, the terminals include a positive terminal 210 and a negative terminal 220, both of which are disposed on the first wall 20. At the same time, the through-hole group 310 is disposed between the positive terminal 210 and the negative terminal 220. It should be noted that during the operation of a single cell, the area between the positive terminal 210 and the negative terminal 220 is the main current conduction path and also the main area for heat generation. By placing the through-hole group 310 between the positive and negative terminals, heat can be dissipated most directly and quickly through the through-hole group 310 after it is generated, avoiding excessive heat accumulation around the terminals and greatly improving heat dissipation efficiency.

[0024] Based on the above embodiments, the through-hole group 310, located between the positive electrode post 210 and the negative electrode post 220, can effectively improve the heat dissipation performance of the battery, thereby improving the application efficiency of the through-hole group 310. In some embodiments of this disclosure, the range of S1 / (S2×d) is limited to 0.015mm. -1 -0.17mm -1 It should be noted that this embodiment restricts the placement of the through-hole group 310 on the insulating plate 30, specifically placing it between the positive terminal 210 and the negative terminal 220. The through-hole group 310 has higher utilization efficiency and more easily meets the heat dissipation requirements of the first wall 20. For the range of S1 / (S2×d), its minimum value is not less than 0.015mm. -1 This is to meet the minimum heat dissipation requirements of the through-hole assembly 310 for the first wall 20, while its maximum value is no greater than 0.17mm. -1 This ensures the insulation performance of the insulating plate 30 and improves the operational stability of the individual battery cells.

[0025] In other embodiments of this disclosure, such as Figure 4As shown, the terminals include a positive terminal 210 and a negative terminal 220, while the through-hole group 310 is disposed on the outside of the positive terminal 210 and the negative terminal 220. It should be noted that placing the through-hole group 310 on the outside of the positive terminal 210 and the negative terminal 220, i.e., on both sides, allows for a more rational layout of the insulating plate 30 in the middle area on the first wall 20, without causing structural damage. Furthermore, the through-hole group 310 does not excessively interfere with the space between the positive terminal 210 and the negative terminal 220, achieving effective insulation of the area between the positive terminal 210 and the negative terminal 220. Based on this, the range of S1 / (S2×d) is limited to 0.016mm. -1 -0.18mm -1 It should be noted that in this embodiment, the space on both sides of the positive terminal 210 and the negative terminal 220 is relatively smaller than the space in the middle area, reducing the degree of freedom in setting the through hole group 310; and for the range of S1 / (S2×d), its minimum value is not less than 0.016mm. -1 This is to ensure that the opening of the through-hole group 310 can meet the minimum heat dissipation requirements of the first wall 20 while its maximum value does not exceed 0.18mm. -1 To avoid the through hole group 310 affecting the insulation effect between the pole and the first wall 20, and to ensure the insulation function of the insulation plate 30.

[0026] Furthermore, the through-hole group 310 provided in this embodiment can be configured with a single large-area through-hole structure or multiple spaced small-area through-hole structures. In some embodiments of this disclosure, the through-hole group 310 includes multiple through-holes, and the distance between two adjacent through-holes is 0.5mm-5mm, specifically 0.5mm, 1mm, 1.5mm, 2mm, 3mm, or 5mm. It should be noted that the multiple spaced through-holes in the through-hole group 310 can present a more uniform distribution on the insulating plate 30, thereby effectively dissipating heat from multiple areas on the first wall 20 and better optimizing the heat dissipation performance of the battery. However, when the distance between adjacent through-holes is less than 0.5mm, the distance between the through-holes is too close, which can cause heat to interfere with each other during the heat dissipation process, affecting the heat dissipation effect. At the same time, the excessively close distance may also affect the structural strength between the through-holes, increasing the risk of failure of the insulating plate 30 between adjacent through-holes. When the distance between adjacent through holes exceeds 5mm, although it can avoid mutual heat dissipation between the through holes and the strength problem of the insulating plate 30, it will increase the difficulty of setting up the through hole group 310, especially for through hole groups 310 with a large number of through holes. Maintaining the distance between adjacent through holes will restrict their arrangement and reduce the degree of freedom in setting up the through hole group 310. Therefore, Figure 7As shown, by setting the distance h between adjacent through holes in the range of 0.5mm-5mm, it is ensured that each through hole can effectively play a heat dissipation role, avoid heat interference between through holes, and at the same time enable the through hole group 310 to have more position settings, thus achieving a more reasonable position setting.

[0027] In some specific embodiments of this disclosure, such as Figure 5 As shown, the through-hole group 310 includes a first through-hole 320, which is arranged around a portion of a pole in the circumferential direction to achieve effective heat dissipation for the single pole, while... Figure 5 As shown on the left and right sides, the first through-hole 320 has an arc-shaped structure on the side facing the pole it surrounds. It should be noted that the first through-hole 320, which surrounds the pole and has an arc-shaped edge, can more directly guide the heat generated by the pole into the through-hole. At the same time, it is preferable that the arc-shaped edge of the first through-hole 320 is concentric with the pole, so that the heat emitted from the outer wall of the pole can reach the first through-hole 320 along its diameter direction with the shortest distance, and be dissipated through the first through-hole 320. The concentric structure ensures that each position on the outer wall of the pole has a corresponding through-hole area in the radial direction, thereby achieving more uniform heat dissipation on the outer wall of the pole.

[0028] Furthermore, the first through-hole 320 surrounding the pole post can make full use of the space around the pole post. While maintaining a safe distance between the through-hole group 310 and the pole post, it allows for a more compact structure of the through-hole group 310, achieving effective opening of the through-hole group 310 within a limited opening space. Simultaneously, since the first through-hole 320 only surrounds a portion of the pole post in the circumferential direction, each pole post can be provided with one or more first through-holes 320 to meet its key heat dissipation requirements.

[0029] Furthermore, in some other embodiments of this disclosure, such as Figure 6 As shown, the through-hole group 310 includes a second through-hole 330. It should be noted that the second through-hole 330 is inclined relative to the edge of the first wall 20. This inclined arrangement allows the second through-hole 330 to adapt to the distance requirements of the pole post, offering greater flexibility in its placement compared to a regularly arranged through-hole structure. Therefore, it better maintains the minimum distance requirement between the through-hole group 310 and the pole post. Based on this, the range of S1 / (S2×d) is limited to 0.018mm. -1 -0.18mm -1 Based on the inclined structure of the second through hole 330, the minimum distance d between the through hole group 310 and the pole post is easier to maintain, while the minimum value of limiting S1 / (S2×d) is not less than 0.018mm. -1This design ensures that the distance between the through-hole assembly 310 and the pole post is met, while also allowing the through-hole assembly 310 to meet the heat dissipation requirements of the first wall 20, with a maximum value not exceeding 0.18mm. -1 This is to prevent the through-hole group 310 from affecting the insulation effect between the pole and the first wall 20, and to ensure the insulation function of the insulation plate 30.

[0030] Furthermore, it should be noted that the through-hole group 310 provided in this embodiment has various opening methods on the insulating plate 30 covering the first wall 20. To further limit the heat dissipation and insulation effects of the individual battery cells, thereby improving the operational safety of the individual battery cells, in this embodiment, as shown... Figure 7 As shown, in the first direction, the minimum distance L1 between the through hole group 310 and the edge of the first wall 20 near the edge of the first wall 20 ranges from 1mm to 8mm, specifically 1mm, 2mm, 4mm, 6mm, and 8mm; while in the second direction, the minimum distance L2 between the through hole group 310 and the edge of the first wall 20 near the edge of the first wall 20 ranges from 1mm to 6mm, specifically 1mm, 2mm, 4mm, 5mm, and 6mm; it should be noted that the first direction is the direction of the line connecting the two poles, which is usually the length direction of the first wall 20, while the second direction is perpendicular to the first direction on the plane of the first wall 20, which is usually the width direction of the first wall 20. Specifically, when the distance between the through-hole group 310 and the edge of the first wall 20 in the first direction is less than 1mm, the through-hole group 310 is too close to the edge of the battery, which will lead to uneven heat distribution inside the battery, affecting battery performance and lifespan. Conversely, when the distance between the through-hole group 310 and the edge of the first wall 20 in the first direction exceeds 8mm, the through-hole group 310 is too far from the edge, resulting in insufficient utilization of the space inside the first wall 20, affecting the position of the through-hole group 310, the insulation between the first wall 20 and the terminal post, and reducing the battery's operational safety. Therefore, by setting the distance between the through-hole group 310 and the edge of the first wall 20 in the first direction within the range of 1mm-8mm, the internal space of the battery can be fully utilized, maintaining insulation while allowing heat to be distributed and dissipated more evenly. The minimum distance between the through-hole group 310 and the edge of the first wall 20 in the second direction is limited to 1mm-6mm, which has the same effect as the distance between the through-hole group 310 and the edge of the first wall 20 in the first direction, also balancing the insulation performance and heat dissipation effect of the through-hole group 310, and will not be elaborated further here.

[0031] Furthermore, in the single-cell battery provided in this disclosure embodiment, the minimum distance d between the through-hole group 310 and the terminal post is one of the opening parameters that directly affects the insulation and heat dissipation effect of the insulating plate 30. If the minimum distance between the through-hole group 310 and the terminal post is too small, it has a good heat dissipation effect on the periphery of the terminal post, but since the first wall 20 at the location of the through-hole group 310 is exposed, there is a risk that metal debris may connect the terminal post and the through-hole group 310, leading to a short circuit. If the minimum distance between the through-hole group 310 and the terminal post is too large, the heat accumulated at the terminal post will be difficult to dissipate in time, and the area on the insulating plate 30 that can be used to set the through-hole group 310 will be relatively reduced, thereby limiting the structural setting of the through-hole group 310 and hindering the achievement of the best heat dissipation effect. Therefore, in some embodiments of this disclosure, such as Figure 3 As shown, the minimum distance d between the through hole group 310 and the pole post is set to a range of 2mm-10mm, specifically 2mm, 3mm, 4mm, 6mm, 8mm, and 10mm; this ensures that the through hole group 310 maintains a safe distance from the pole post, reducing the risk of short circuit between the pole post and the first wall 20, while preventing poor heat dissipation efficiency due to the distance between the through hole group 310 and the pole post.

[0032] Furthermore, in some embodiments of this disclosure, the sum of the opening areas of the through-hole group is S1, and the area of ​​the first wall is S2. The range of S1 / S2 is limited to 0.1-0.4, specifically 0.1, 0.2, 0.3, and 0.4. It should be noted that the larger the opening area S1 of the through-hole group 310, the better its heat dissipation effect. However, if its ratio to S2 exceeds 0.4, although the heat dissipation effect meets the usage requirements, the excessively large through-hole group 310 will not only weaken the overall structural strength of the insulating plate 30, but also reduce the area of ​​the insulating shielding area of ​​the insulating plate 30 to the first wall 20, affecting the sealing and insulation of the battery. If the value of S1 / S2 is less than 0.1, there will be a problem of insufficient heat dissipation effect of the through-hole group 310, which will cause the heat generated by the single battery to accumulate continuously during operation, thereby reducing the battery performance and lifespan, and may also cause risks such as battery bulging, leakage, or even thermal runaway.

[0033] Furthermore, such as Figure 2 and Figure 8 As shown, in some embodiments of this disclosure, a portion of the individual battery cell is further covered with an insulating film 40 to achieve insulation of the covered area while preventing moisture, dust, and other impurities from the outside of the battery from entering the battery, thereby improving the battery's sealing and reliability. Simultaneously, a portion of the insulating film 40 extends onto the first wall 20 and covers a portion of the first wall 20 to enhance the insulation effect on the first wall 20.

[0034] In some embodiments of this disclosure, in the normal direction of the first wall 20, the projections of the through hole group 310 and the insulating film 40 do not overlap. That is, the insulating film 40 is used to optimize the insulation effect on the first wall 20, while the through hole group 310 maintains the heat dissipation effect of the opening area, and the two do not overlap.

[0035] In other embodiments of this disclosure, in the normal direction of the first wall 20, the projections of the through-hole group 310 and the insulating film 40 overlap, and the area of ​​the overlapping area is 2 mm. 2 -10mm 2 Specifically, it can be 2mm. 2 5mm 2 7mm 2 10mm 2 Meanwhile, the ratio of the projected overlapping area to the area of ​​the first wall 20 is 0.01%-0.1%. It should be noted that in the overlapping area of ​​the through-hole group 310 and the insulating film 40 along the normal direction of the first wall 20, the insulating film 40 can compensate for the poor insulation effect caused by the through-hole group 310, while the through-hole group 310 can compensate for the poor heat dissipation effect caused by the insulating film 40 covering it. Through this combined effect, the insulation and heat dissipation effects of the first wall 20 are improved. However, the ratio of the projected overlapping area of ​​the through-hole group 310 and the insulating film 40 to the area of ​​the first wall 20 cannot exceed 0.1%, to avoid an excessively large overlapping area that would block a large number of openings, causing excessive heat to be trapped by the insulating film 40 and preventing heat dissipation, thus improving the reliability and safety of the single-cell battery.

[0036] Furthermore, it should be noted that in some other embodiments of this disclosure, the electrode post includes a positive electrode post 210 and a negative electrode post 220. For the through-hole group 310, part of the through-hole structure is located between the positive electrode post 210 and the negative electrode post 220, while another part of the through-holes is located outside the positive electrode post 210 and the negative electrode post 220. This allows for targeted heat dissipation of concentrated heat-generating areas while fully utilizing the space of the first wall 20, thereby improving heat dissipation efficiency. Specifically, if the sum of the areas of the through-holes located outside the positive electrode post 210 and the negative electrode post 220 is S3, then the range of S3 / (S2×d) is limited to 0.005 mm. -1 -0.045mm -1 Furthermore, the range of S3 is 100mm. 2 -600mm 2 Specifically, it can be 100mm 2 300mm 2 500mm 2 600mm 2 The range of S2 is 2500mm. 2 -14000mm2 Specifically, it can be 2500mm 2 7000mm 2 10000mm 2 14000mm 2 Meanwhile, d ranges from 2mm to 10mm, specifically 2mm, 3mm, 5mm, 7mm, 8mm, and 10mm. It should be noted that if S3 / (S2×d) is too small, the heat dissipation effect of the outer through-hole will be poor, leading to a localized increase in battery temperature, affecting battery performance and lifespan. Furthermore, an excessively small outer through-hole area may also cause uneven heat distribution inside the battery, resulting in an uneven internal temperature field, which in turn affects the battery's charge / discharge efficiency and cycle life. Conversely, if S3 / (S2×d) is too large, it will increase the risk of insulation failure between the terminal and the casing 10, and weaken the overall structural strength of the insulation plate 30. This makes the insulation plate 30 prone to cracking or deformation under internal pressure and external mechanical impact during battery operation, thus affecting the battery's sealing and insulation properties.

[0037] The terms "first," "second," "left side," and "right side," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may not be defined in the listed steps or units, but may include steps or units not listed.

[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single cell, characterized by, The device includes a housing (10), on which a pole post is disposed on a first wall (20), and an insulating plate (30) is covered on the first wall (20). The pole post passes through the insulating plate (30). A group of through holes (310) is formed on the insulating plate (30). The sum of the areas of the group of through holes (310) is S1, the area of ​​the first wall (20) is S2, and the minimum distance between the group of through holes (310) and the pole post is d. Then, the range of S1 / (S2×d) is 0.015mm. -1 -0.18mm -1 .

2. The unit cell of claim 1, wherein, The electrode includes a positive electrode (210) and a negative electrode (220), and the through hole group (310) is disposed between the positive electrode (210) and the negative electrode (220).

3. The unit cell of claim 2, wherein, S1 / (S2 x d) is in the range 0.015 mm -1 -0.17 mm -1 .

4. The cell of claim 1 wherein, The electrode includes a positive electrode (210) and a negative electrode (220), and the through hole group (310) is disposed on the outside of the positive electrode (210) and the negative electrode (220).

5. The unit cell of claim 4, wherein, S1 / (S2 x d) is in the range 0.016 mm -1 -0.18 mm -1 .

6. The cell of claim 1 wherein, The through-hole group (310) includes multiple through holes, and the distance h between adjacent through holes is 0.5mm-5mm.

7. The cell of claim 1 wherein, The through-hole group (310) includes a first through-hole (320), which is arranged around one of the pole posts, and the side of the first through-hole (320) facing the pole post has an arc-shaped structure.

8. The cell of claim 1 wherein, The through hole group (310) comprises a second through hole (330) which is a structure arranged obliquely relative to the edge of the first wall (20), and S1 / (S2xd) ranges from 0.018mm -1 -0.18mm -1 .

9. The cell of claim 1 wherein, The minimum distance L1 between the through hole group (310) and the edge of the first wall (20) in the first direction is 1mm-8mm; the minimum distance L2 between the through hole group (310) and the edge of the first wall (20) in the second direction is 1mm-6mm. The first direction is the direction of the line connecting the two poles, and the second direction is perpendicular to the first direction.

10. The cell of claim 1 wherein, The minimum distance d between the through hole group (310) and the pole post ranges from 2mm to 10mm.

11. The cell of claim 1 wherein, The sum of the areas of the through holes (310) and the area of ​​the first wall (20) in the ratio S1 / S2 ranges from 0.1 to 0.

4.

12. The cell of claim 1 wherein, It also includes an insulating film (40), which covers the outer wall of the single cell and extends to a portion of the first wall (20), and the through hole group (310) and the insulating film (40) do not overlap in the normal direction of the first wall (20).

13. The cell of claim 1 wherein, It also includes an insulating film (40), which covers the outer wall of the single cell and extends to a portion of the first wall (20). The area of ​​the overlapping region between the projection of the through-hole group (310) and the insulating film (40) in the normal direction of the first wall (20) is 2 mm. 2 -10mm 2 The ratio of the area of ​​the projected overlapping region to the area of ​​the first wall (20) is 0.01%-0.1%.

14. The cell of claim 1 wherein, The electrode includes a positive electrode (210) and a negative electrode (220). Part of the through-hole group (310) is located between the positive electrode (210) and the negative electrode (220), while another part of the through-holes is located outside the positive electrode (210) and the negative electrode (220). The area of ​​the through-holes located outside the positive electrode (210) and the negative electrode (220) is S3, and the range of S3 / (S2×d) is 0.005 mm. -1 -0.045mm -1 .

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