Battery and battery pack

Abstract

The application relates to the technical field of batteries, and discloses a battery and a battery pack, which comprise a battery shell, which is enclosed to form an accommodating space, wherein the battery shell is provided with an exhaust hole at a first surface, the exhaust hole is arranged in communication with the accommodating space, the projection area of the exhaust hole on the first surface is S1 mm2, an explosion-proof valve is arranged to cover the exhaust hole, a patch is attached to the first surface and covers the explosion-proof valve, the patch is provided with at least one slit, the projection of the slit on the first surface at least partially coincides with the projection of the exhaust hole on the first surface, the total projection coincidence area of the projection of the slit on the first surface and the projection of the exhaust hole on the first surface is S2 mm2, and S1 and S2 satisfy 0.03% <= S2 / S1 <= 2%. The application can guarantee the exhaust capacity of the battery and the protection effect of the patch on the explosion-proof valve.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to batteries and battery packs. Background Technology

[0002] With the increasing development of new energy sources, the requirements for battery safety performance are becoming more and more stringent. Batteries are usually equipped with explosion-proof valves. When a battery experiences problems such as thermal runaway, gas will be generated inside the battery. When the internal pressure of the battery reaches a certain level, the explosion-proof valve will open and allow the gas to be released from the battery to the outside, preventing more serious safety accidents such as battery explosion.

[0003] Explosion-proof valves are typically covered with explosion-proof valve patches for protection. These patches usually have openings to allow for venting and conduction. However, in existing technologies, the opening design on explosion-proof valve patches cannot simultaneously achieve both venting and protective capabilities. Summary of the Invention

[0004] In view of this, the present invention provides a battery and a battery pack to solve the problem that the opening design on the explosion-proof valve patch in the prior art cannot simultaneously take into account the exhaust capacity and the protection capacity.

[0005] In a first aspect, the present invention provides a battery, comprising: a battery casing enclosing a receiving space, wherein the battery casing has a vent hole on a first surface, the vent hole being connected to the receiving space, and the projected area of ​​the vent hole on the first surface being S1 mm²; an explosion-proof valve covering the vent hole; and a patch attached to the first surface and covering the explosion-proof valve, wherein the patch has at least one slit, the projected area of ​​the slit on the first surface at least partially overlapping the projected area of ​​the vent hole on the first surface, and the total projected overlapping area of ​​the projected area of ​​the slit on the first surface and the projected area of ​​the vent hole on the first surface being S2 mm²; wherein S1 and S2 satisfy 0.03% ≤ S2 / S1 ≤ 2%.

[0006] Beneficial effects: By limiting the values ​​of S1 and S2, the battery's venting capacity is ensured while maintaining the protective effect of the patch on the explosion-proof valve. Specifically, if the values ​​of S2 / S1 are too large, the opening area on the patch will be too large, which can easily cause contamination of the explosion-proof valve and lead to its failure, resulting in battery safety protection failure. Alternatively, if the venting port opening area is too small, it will not be able to achieve rapid pressure relief of the battery. If the values ​​of S2 / S1 are too small, the opening area on the patch will be too small, which will have too great an impact on battery venting, making it difficult to achieve proper ventilation of the venting port, which can easily lead to insufficient battery venting capacity. The gas generation process may cause deformation of the explosion-proof valve, resulting in unstable burst pressure of the explosion-proof valve. Alternatively, if the venting port opening area is too large, it may easily affect the structural strength of the battery.

[0007] In one optional embodiment, the battery capacity is C, the battery platform voltage is U, and the projected area S1 mm² of the vent hole on the first surface satisfies 0.2×C×U≤S1≤3.5×C×U, where C is the value in A / Ah and U is the value in V.

[0008] Beneficial effects: The opening area of ​​the vent is limited according to the battery capacity and the battery plateau voltage, which ensures the battery's pressure relief performance while maintaining the battery's structural strength.

[0009] In one optional embodiment, the patch forms two parallel edges corresponding to the edge of the slit. Along the extending direction of the edges, the length of the portion where the orthographic projection of the edge on the first surface coincides with the orthographic projection of the vent hole on the first surface is L mm, the distance between the two edges is A mm, the number of slits is N, and the total overlapping area S2 mm² of the orthographic projection of the slit on the first surface and the orthographic projection of the vent hole on the first surface satisfies S2=N×L×A, where N is a positive integer.

[0010] Beneficial effect: The slit is formed by two parallel edges, which facilitates the processing and shaping of the slit on the patch.

[0011] In one optional embodiment, the length L mm of the portion where the orthographic projection of the edge on the first surface coincides with the orthographic projection of the vent hole on the first surface is within the range of 0.5 mm ≤ L mm ≤ 10 mm.

[0012] Beneficial effects: While ensuring the battery's venting capacity, it also ensures the protective effect of the patch on the explosion-proof valve.

[0013] In one optional implementation, the distance A mm between the two sides is in the range of 0.1 mm ≤ A mm ≤ 1.5 mm.

[0014] Beneficial effects: While ensuring the battery's venting capacity, it also ensures the protective effect of the patch on the explosion-proof valve.

[0015] In one optional implementation, the length of the edge is L1 mm along the extension direction of the edge, and the value of L1 mm is within the range of 0.5 mm ≤ L1 mm ≤ 15 mm.

[0016] Beneficial effects: While ensuring the battery's venting capacity, the patch also ensures the protection effect of the explosion-proof valve and the structural strength of the patch.

[0017] In one optional embodiment, the thickness of the patch is t mm in a direction perpendicular to the first surface, and the value of t mm is within the range of 0.01 mm ≤ t mm ≤ 1 mm.

[0018] Beneficial effects: While ensuring the structural strength of the patch, it improves the utilization rate of battery space.

[0019] In one alternative embodiment, the patch includes a sheet and an adhesive, the adhesive being bonded between the sheet and the first surface, the adhesive forming a clearance area near the slit and forming a first edge and a second edge on opposite sides of the slit.

[0020] Beneficial effects: The adhesive is used to bond the sheet to the battery casing, which facilitates the assembly of the patch. In addition, by setting a clearance area, the adhesive is prevented from blocking the opening, thus ensuring the ventilation effect of the opening.

[0021] In one optional embodiment, both the first edge and the second edge are arranged parallel to the side portion, and the distance between the first edge and the second edge is B mm, wherein the value of B mm is within the range of 3.5 mm ≤ B mm ≤ 10 mm.

[0022] Beneficial effects: While ensuring the stability of patch assembly, it also ensures the venting effect of the opening.

[0023] Secondly, the present invention also provides a battery pack including the battery described above. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a partial structural diagram of a battery according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A top view of the battery shown;

[0027] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0028] Figure 4 This is a schematic diagram of the mating structure of the patch and the vent hole in an embodiment of the present invention;

[0029] Figure 5 for Figure 2 A magnified view of part B in the diagram;

[0030] Figure 6 for Figure 3 A magnified view of part of C;

[0031] Figure 7 This is a top view of the patch according to an embodiment of the present invention;

[0032] Figure 8 This is a bottom view of the patch according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Battery casing; 11. First surface; 12. Vent; 2. Explosion-proof valve; 3. Patch; 31. Slit; 32. Edge; 33. Sheet; 34. Glue; 341. Clearance area; 342. First edge; 343. Second edge. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0037] According to an embodiment of the present invention, a battery is provided, comprising: a battery casing 1 enclosing a receiving space, the battery casing 1 having a vent 12 on a first surface 11, the vent 12 communicating with the receiving space, the projected area of ​​the vent 12 on the first surface 11 being S1 mm²; an explosion-proof valve 2 covering the vent 12; and a patch 3 attached to the first surface 11 and covering the explosion-proof valve 2, the patch 3 having at least one slit 31, the projected area of ​​the slit 31 on the first surface 11 at least partially overlapping with the projected area of ​​the vent 12 on the first surface 11, the total projected overlapping area of ​​the slit 31 on the first surface 11 and the projected area of ​​the vent 12 on the first surface 11 being S2 mm²; wherein S1 and S2 satisfy 0.03% ≤ S2 / S1 ≤ 2%.

[0038] Using the battery of this embodiment, by limiting the values ​​of S1 and S2, the battery's venting capacity is ensured while maintaining the protective effect of the patch 3 on the explosion-proof valve 2. Specifically, if the value of S2 / S1 is too large, the area of ​​the slit 31 on the patch 3 will be too large, which may cause the explosion-proof valve 2 to become contaminated and fail, leading to battery safety protection failure. Alternatively, if the opening range of the vent hole 12 is too small, the battery cannot be depressurized quickly. If the value of S2 / S1 is too small, the area of ​​the slit 31 on the patch 3 will be too small, which will have too great an impact on the battery's venting, making it difficult to achieve the conduction and venting of the vent hole 12, which may result in insufficient battery venting capacity. The gas generation process may cause the explosion-proof valve 2 to deform, and the burst pressure of the explosion-proof valve 2 may be unstable. Alternatively, if the opening range of the vent hole 12 is too large, it may affect the structural strength of the battery.

[0039] It is worth noting that the slit 31 can be set to one or several. When the slit 31 is set to one, S2 is the overlapping area of ​​the projection of the slit 31 onto the first surface 11 and the projection of the vent hole 12 onto the first surface 11; when the slit 31 is set to several, S2 is the sum of the overlapping areas of the projections of all the slits 31 onto the first surface 11 and the projections of the vent hole 12 onto the first surface 11.

[0040] It should be noted that in this embodiment, please refer to... Figure 7 and Figure 8 The slit 31 is made from the edge of the patch 3 toward the center of the patch 3. Therefore, please refer to... Figure 4 and Figure 6 In order for the patch 3 to adhere to the battery casing 1 and cover the explosion-proof valve 2, the edge of the patch 3 is adhered to the first surface 11. Therefore, in this embodiment, the portion of the slit 31 near the edge is located above the first surface 11, and the portion of the slit 31 near the center is located above the explosion-proof valve 2. It can be understood that in this embodiment, the area of ​​S2 refers to the area of ​​the portion of the slit 31 located above the explosion-proof valve 2.

[0041] It is worth noting that the battery casing 1 includes a casing and a cover plate. At least one end of the casing is open, and the cover plate is connected to the casing and covers the opening. The casing and the cover plate together form an accommodating space. The vent 12 can be provided on the casing or on the cover plate.

[0042] Optionally, the value of S2 / S1 can be any one of 0.03%, 0.05%, 0.08%, 0.1%, 0.12%, 0.15%, 0.18%, 2%, or a value between any two of these values.

[0043] It should be noted that S1 and S2 are values ​​taken when the unit is mm².

[0044] Specifically, in one embodiment, the battery capacity is C, the battery plateau voltage is U, and the projected area S1 mm² of the vent hole 12 on the first surface 11 satisfies 0.2×C×U≤S1≤3.5×C×U, where C is the value in A / Ah and U is the value in V. This setting limits the opening area of ​​the vent hole 12 based on the battery capacity and plateau voltage, ensuring both the battery's pressure relief performance and structural strength.

[0045] It is worth noting that if the value of S1 is too small, the opening range of the vent 12 will be too small, which will not facilitate the discharge of gas inside the battery and may still easily lead to risks such as explosion when the battery experiences thermal runaway; if the value of S1 is too large, the opening range of the vent 12 will be too large, which may affect the structural strength of the battery casing 1.

[0046] It is worth noting that battery capacity is one of the important performance indicators for measuring battery performance. It represents the amount of electricity that the battery can release under certain conditions (discharge rate, temperature, termination voltage, etc.).

[0047] It is worth noting that the plateau voltage of a battery refers to the voltage value at which the voltage change is minimal while the capacity change is substantial. The voltage plateau can be clearly identified in the charge-discharge curve.

[0048] It is understood that in this embodiment, S1 = X × C × U, where the value of X satisfies 0.2 ≤ X ≤ 3.5.

[0049] Specifically, in one embodiment, such as Figure 5 As shown, the patch 3 forms two parallel edges 32 corresponding to the edge of the slot 31. Along the extending direction of the edges 32, the length of the portion where the orthographic projection of the edge 32 on the first surface 11 overlaps with the orthographic projection of the vent hole 12 on the first surface 11 is L mm. The distance between the two edges 32 is A mm. The number of slots 31 is N. The total overlapping area S2 mm² of the orthographic projections of the slots 31 and the vent hole 12 on the first surface 11 satisfies S2 = N × L × A, where N is a positive integer. This arrangement, using two parallel edges 32 to form the slot 31, facilitates the processing and shaping of the slot 31 on the patch 3.

[0050] It is worth noting that, please refer to Figure 5 The slit 31 is a rectangular structure projected onto the first surface 11, with one side having a length of L mm and the other side having a length of A mm.

[0051] Furthermore, in one embodiment, such as Figure 5As shown, the length L mm of the portion where the orthographic projection of the edge 32 on the first surface 11 overlaps with the orthographic projection of the vent hole 12 on the first surface 11 is within the range of 0.5 mm ≤ L mm ≤ 10 mm. This setting ensures both the battery's venting capacity and the protective effect of the patch 3 on the explosion-proof valve 2.

[0052] It is worth noting that if the value of L is too small, the area of ​​the slit 31 may be too small, which will have too great an impact on the battery's venting and make it difficult to achieve proper ventilation of the vent hole 12. This can easily lead to insufficient battery venting capacity, and the gas generation process may cause deformation of the explosion-proof valve 2, resulting in unstable burst pressure. If the value of L is too large, the area of ​​the slit 31 may be too large, which can easily cause contamination and failure of the explosion-proof valve 2, leading to battery safety protection failure.

[0053] Optionally, L mm can be any value from 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, or a value between any two of these values.

[0054] Furthermore, in one embodiment, such as Figure 5 As shown, the distance A mm between the two edges 32 is within the range of 0.1 mm ≤ A mm ≤ 1.5 mm. This setting ensures both the battery's venting capacity and the protective effect of the patch 3 on the explosion-proof valve 2.

[0055] It is worth noting that if the value of A is too small, the area of ​​the slit 31 may be too small, which will have too great an impact on the battery's venting, making it difficult to achieve proper ventilation of the vent hole 12. This can easily lead to insufficient venting capacity of the battery, and the gas generation process may cause deformation of the explosion-proof valve 2, resulting in unstable burst pressure. If the value of A is too large, the area of ​​the slit 31 may be too large, which can easily cause contamination and failure of the explosion-proof valve 2, leading to battery safety protection failure.

[0056] Optionally, A mm can be any value from 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, or a value between any two values.

[0057] Furthermore, in one embodiment, such as Figure 5As shown, along the extension direction of edge 32, the length of edge 32 is L1mm, and the value of L1mm is within the range of 0.5mm≤L1mm≤15mm. This setting ensures the battery's venting capacity while guaranteeing the protective effect of patch 3 on explosion-proof valve 2, and also ensures the structural strength of patch 3.

[0058] It is worth noting that if the value of L1 is too small, the area of ​​the slit 31 may be too small, which will have too great an impact on the battery's venting and make it difficult to achieve the conduction and venting of the vent hole 12. This can easily lead to insufficient battery venting capacity, and the gas generation process may cause deformation of the explosion-proof valve 2, resulting in unstable burst pressure of the explosion-proof valve 2. If the value of L1 is too large, the area of ​​the slit 31 may be too large, which may easily cause contamination and failure of the explosion-proof valve 2, leading to battery safety protection failure. Furthermore, it may result in poor structural strength of the patch 3, affecting the reliability of the patch 3.

[0059] It is understandable that, such as Figure 5 As shown, the length of the entire edge 32 is L1 mm, of which the part with a length of L mm is located above the explosion-proof valve 2, and the remaining part with a length of L1 mm - L mm is located above the battery casing 1.

[0060] Optionally, L1 mm can be any value from 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, or a value between any two of these values.

[0061] In one embodiment, such as Figure 6 As shown, the thickness of patch 3 is t mm along the direction perpendicular to the first surface 11, and the value of t mm satisfies the range of 0.01 mm ≤ t mm ≤ 1 mm. This setting improves the battery space utilization while ensuring the structural strength of patch 3.

[0062] It is worth noting that if the value of t is too small, patch 3 will be too thin, resulting in weak structural strength and affecting its reliability. If the value of t is too large, patch 3 will be too thick, occupying too much battery space and affecting the battery's space utilization and energy density.

[0063] Optionally, t mm can be any value from 0.01mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, or a value between any two values.

[0064] In one embodiment, such as Figure 8 As shown, the patch 3 includes a sheet 33 and an adhesive 34. The adhesive 34 is bonded between the sheet 33 and the first surface 11. The adhesive 34 forms a clearance area 341 near the slot 31 and forms a first edge 342 and a second edge 343 on opposite sides of the slot 31. The adhesive 34 is used to bond the sheet 33 to the battery casing 1, which facilitates the assembly of the patch 3. Furthermore, by providing the clearance area 341, the adhesive 34 is prevented from blocking the slot 31, ensuring the venting effect of the slot 31.

[0065] That is, the colloid 34 is not set along the entire circumference of the sheet 33, but rather a clearance area 341 (without colloid) is formed on both sides of the slit 31, and the slit 31 is located between the first edge 342 and the second edge 343.

[0066] Furthermore, in one embodiment, such as Figure 8 As shown, both the first edge 342 and the second edge 343 are parallel to the edge 32, and the distance between the first edge 342 and the second edge 343 is B mm, where B mm is within the range of 3.5 mm ≤ B mm ≤ 10 mm. This arrangement ensures the stability of the patch 3 assembly while also guaranteeing the venting effect of the slot 31.

[0067] It is worth noting that if the value of B is too small, the colloid 34 will be too close to the slit 31, which may affect the venting effect of the slit 31. If the value of B is too large, the setting range of the colloid 34 will be reduced, which may affect the bonding strength between the colloid 34, the sheet 33, and the battery casing 1, thereby affecting the stability of the patch 3 assembly.

[0068] Optionally, B mm can be any value from 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, or a value between any two of these values.

[0069] It should be noted that L, A, L1, t, and B are all values ​​taken in mm.

[0070] The following describes the test results of the batteries through various embodiments and comparative examples. The difference between the embodiment batteries and the comparative example batteries lies in the different values ​​of S2 / S1. Furthermore, the embodiment batteries refer to batteries whose S2 / S1 values ​​meet the requirements of this embodiment, while the comparative example batteries refer to batteries whose S2 / S1 values ​​do not meet the requirements of this embodiment. The parameters and test results of the embodiment batteries and comparative example batteries are shown in Table 1.

[0071] Table 1:

[0072]

[0073] As can be seen from Table 1, in Examples 1 to 10, the value of S2 / S1 is in the range of 0.03% to 2%. The batteries in Examples 1 to 10 can be vented smoothly, the battery explosion pressure is stable, the explosion-proof valve 2 is not contaminated, and the battery safety test is passed.

[0074] As can be seen from Table 1, in Comparative Example 1 and Comparative Example 2, the values ​​of S2 / S1 are not within the range of 0.03% to 2% and are less than 0.03%. The area of ​​the slit 31 on the patch 3 of the battery in Comparative Example 1 and Comparative Example 2 is too small, which has too much impact on the battery venting and makes it difficult to achieve the conduction and venting of the vent hole 12. This can easily lead to insufficient battery venting capacity. The gas generation process will cause the explosion-proof valve 2 to deform, and the explosion pressure of the explosion-proof valve 2 will be unstable, causing the battery safety test to fail.

[0075] As can be seen from Table 1, in Comparative Example 3, the value of S2 / S1 is not in the range of 0.03% to 2% and is greater than 2%. The area of ​​the slit 31 on the patch 3 of the battery in Comparative Example 3 is too large, which causes the explosion-proof valve 2 to be contaminated and fail, resulting in the failure of battery safety protection.

[0076] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, comprising the battery described above.

[0077] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: The battery casing is enclosed to form a receiving space. The battery casing has an exhaust hole on its first surface. The exhaust hole is connected to the receiving space. The projected area of ​​the exhaust hole on the first surface is S1 mm². An explosion-proof valve is provided to cover the vent hole; A patch is attached to a first surface and covers the explosion-proof valve. The patch has at least one slit. The orthographic projection of the slit on the first surface at least partially overlaps with the orthographic projection of the vent hole on the first surface. The total overlapping area of ​​the orthographic projection of the slit on the first surface and the orthographic projection of the vent hole on the first surface is S2 mm². Among them, S1 and S2 satisfy 0.03%≤S2 / S1≤2%.

2. The battery according to claim 1, characterized in that, The battery has a capacity of C, a platform voltage of U, and the projected area S1 mm² of the vent hole on the first surface satisfies 0.2×C×U≤S1≤3.5×C×U, where C is the value in A / Ah and U is the value in V.

3. The battery according to claim 2, characterized in that, The patch forms two parallel sides corresponding to the edge of the slit. Along the extension direction of the sides, the length of the portion where the orthographic projection of the side on the first surface coincides with the orthographic projection of the vent hole on the first surface is L mm. The distance between the two sides is A mm. The number of slits is N. The total overlapping area S2 mm² of the orthographic projection of the slit on the first surface and the orthographic projection of the vent hole on the first surface satisfies S2=N×L×A, where N is a positive integer.

4. The battery according to claim 3, characterized in that, The length L mm of the portion where the orthographic projection of the edge on the first surface coincides with the orthographic projection of the exhaust hole on the first surface is within the range of 0.5 mm ≤ L mm ≤ 10 mm.

5. The battery according to claim 3, characterized in that, The distance A mm between the two sides is within the range of 0.1 mm ≤ A mm ≤ 1.5 mm.

6. The battery according to claim 3, characterized in that, Along the extension direction of the edge, the length of the edge is L1mm, and the value of L1mm is within the range of 0.5mm≤L1mm≤15mm.

7. The battery according to any one of claims 1 to 6, characterized in that, Along the direction perpendicular to the first surface, the thickness of the patch is t mm, and the value of t mm is within the range of 0.01 mm ≤ t mm ≤ 1 mm.

8. The battery according to any one of claims 3 to 6, characterized in that, The patch includes a sheet and an adhesive, the adhesive being bonded between the sheet and the first surface, the adhesive forming a clearance area near the slit, and forming a first edge and a second edge on opposite sides of the slit.

9. The battery according to claim 8, characterized in that, Both the first edge and the second edge are parallel to the side portion, and the distance between the first edge and the second edge is B mm, wherein the value of B mm is within the range of 3.5 mm ≤ B mm ≤ 10 mm.

10. A battery pack, characterized in that, The battery includes any one of claims 1 to 9.

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