Battery

Abstract

The present invention relates to the technical field of batteries, and discloses a battery, which comprises: a packaging film, which is internally provided with an accommodation space; the pole group is arranged in the accommodating space; the first end of the pole lug is electrically connected with the pole group, and the second end of the pole lug extends towards the direction far away from the pole group and extends out of the packaging film; the insulating part is arranged around the outer surface of the tab, the edge of one end, provided with the tab, of the packaging film is subjected to hot melting packaging to form a heat sealing area, and the packaging film and the insulating part are connected through the heat sealing area; wherein in the length direction of the battery, the width of the insulating part is T, the width of the heat sealing area is T1, and T1 / T is larger than or equal to 10% and smaller than or equal to 90%. The proportional relation between the width of the heat sealing area and the width of the insulating part is limited, so that the heat sealing process is facilitated, the heat sealing efficiency is ensured, the heat sealing effect of the packaging film and the insulating part is ensured, the sealing performance of the battery is improved, and liquid leakage is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to batteries. Background Art

[0002] With the development of the new energy industry, batteries, as the core components of new energy, are also constantly innovating. Soft-pack batteries have the advantages of simple structure and high energy density, and are widely used in the fields of 3C and power batteries. At present, the basic structure of soft-pack batteries is that two pieces of aluminum-plastic film are punched together and then put together to seal the battery on the side and top to form a sealed structure to wrap the battery cell and prevent electrolyte leakage. Among them, the top seal refers to coating the pole ear with an insulating part (such as pole ear glue), and bonding the pole ear glue and the aluminum-plastic film together by heating. If the heat sealing effect of the pole ear glue and the aluminum-plastic film is not good, it is easy to cause leakage in the soft-pack battery. Summary of the invention

[0003] In view of this, the present invention provides a battery to solve the problem in the prior art that the heat sealing effect between the insulating member and the aluminum-plastic film is poor, which easily leads to battery leakage.

[0004] The present invention provides a battery, comprising: a packaging film, which is provided with a accommodating space; a pole group, which is arranged in the accommodating space; a pole ear, the first end of which is electrically connected to the pole group, and the second end of which extends in a direction away from the pole group and extends out of the packaging film; an insulating member, which is arranged around the outer surface of the pole ear, the packaging film is hot-melt-sealed at the edge of one end where the pole ear is arranged to form a heat-sealed area, and the packaging film and the insulating member are connected and arranged via the heat-sealed area; wherein, along the length direction of the battery, the width of the insulating member is T, and the width of the heat-sealed area is T1, satisfying 10%≤T1 / T≤90%.

[0005] Beneficial effect: By limiting the proportional relationship between the width of the heat-sealing area and the width of the insulating member, the heat-sealing process is facilitated to ensure the heat-sealing efficiency while ensuring the heat-sealing effect of the packaging film and the insulating member, thereby improving the sealing of the battery and avoiding leakage.

[0006] In an optional implementation, the width T of the insulating member satisfies 5 mm ≤ T ≤ 30 mm.

[0007] Beneficial effect: By limiting the width of the insulating member, while avoiding waste of insulating members and increasing production costs, the heat sealing effect between the insulating member and the packaging film is guaranteed, the sealing of the battery is improved, and leakage is avoided.

[0008] In an optional embodiment, along the length direction of the battery, part of the insulating member extends out of the corresponding end of the packaging film to form a first extension portion.

[0009] Beneficial effect: By providing the first extension part, heat sealing between the packaging film and the insulating member is facilitated, thereby ensuring the heat sealing effect.

[0010] In an optional implementation, along the length direction of the battery, the width of the first extension portion is T2, satisfying 10%≤T2 / T≤50%.

[0011] Beneficial effect: By limiting the width of the first extension portion, the volume energy density of the battery is ensured and the increase in production costs is avoided. At the same time, excessive glue overflow from the insulating part during heat sealing, which affects the quality of the tab and the packaging quality of the end of the packaging film, is avoided.

[0012] In an optional embodiment, the heat-sealing area is located inside the end of the corresponding packaging film.

[0013] Beneficial effect: a portion of the packaging film is reserved outside the heat-sealing area to ensure the heat-sealing strength, thereby ensuring the heat-sealing effect between the insulating member and the packaging film, improving the sealing of the battery, and avoiding leakage.

[0014] In an optional embodiment, along the length direction of the battery, the distance between the edge of the heat-sealed area away from the electrode group and the corresponding end of the packaging film is T3, satisfying 0.1 mm≤T3≤5 mm.

[0015] Beneficial effect: By limiting the distance between the heat-sealing area and the end of the packaging film, the heat-sealing strength is guaranteed while ensuring the volume energy density of the battery and avoiding an increase in production costs, thereby ensuring the heat-sealing effect between the insulating part and the packaging film, improving the sealing of the battery, and avoiding leakage.

[0016] In an optional embodiment, along the length direction of the battery, part of the insulating member extends from a side edge of the heat-sealed area close to the electrode group toward the electrode group to form a second extension portion.

[0017] Beneficial effect: By providing the second extension part, the heat sealing strength is ensured, thereby ensuring the heat sealing effect between the insulating member and the packaging film, improving the sealing of the battery, and avoiding leakage.

[0018] In an optional implementation, along the length direction of the battery, the width of the second extension portion is T4, satisfying 1mm≤T4≤10mm.

[0019] Beneficial effect: By limiting the width of the second extension portion, the heat sealing strength is guaranteed while ensuring the volume energy density of the battery and avoiding an increase in production costs, thereby ensuring the heat sealing effect between the insulating member and the packaging film, improving the sealing of the battery, and avoiding leakage.

[0020] In an optional embodiment, the packaging film includes a first film body and a second film body that are arranged opposite to each other, the four edges of the first film body and the second film body are connected and enclosed to form the accommodating space, and the first film body and the second film body are arranged on two opposite sides of the insulating part along the thickness direction of the battery; at the position of the insulating part, the first film body and the second film body are respectively connected to the two opposite sides of the insulating part through the heat sealing area, and at a position outside the insulating part, the first film body and the second film body are connected and arranged through the heat sealing area.

[0021] In an optional implementation, the packaging film is an aluminum-plastic film. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A front view of a battery according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A is a partial enlarged schematic diagram;

[0025] Figure 3 Schematic diagram of the structure of the electrode tab and the insulating member according to an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. Packaging film; 2. Pole group; 3. Pole ear; 4. Insulating member; 41. First extension portion; 42. Second extension portion; 5. Heat sealing area. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0030] According to an embodiment of the present invention, a battery is provided, comprising: a packaging film 1, which has a containing space therein; a pole group 2, which is arranged in the containing space; a pole ear 3, wherein a first end of the pole ear 3 is electrically connected to the pole group 2, and a second end of the pole ear 3 extends in a direction away from the pole group 2 and extends out of the packaging film 1; an insulating member 4, which is arranged around the outer surface of the pole ear 3, and the packaging film 1 is hot-melt-sealed at the edge of one end where the pole ear 3 is arranged to form a heat-sealing area 5, and the packaging film 1 and the insulating member 4 are connected and arranged via the heat-sealing area 5; wherein, along the length direction of the battery, the width of the insulating member 4 is T, and the width of the heat-sealing area 5 is T1, satisfying 10%≤T1 / T≤90%.

[0031] In the battery of this embodiment, by limiting the proportional relationship between the width of the heat-sealing area 5 and the width of the insulating member 4, the heat-sealing process is facilitated to ensure the heat-sealing efficiency while ensuring the heat-sealing effect of the packaging film 1 and the insulating member 4, thereby improving the sealing of the battery and avoiding leakage.

[0032] Please note that Figure 1 , along the length direction of the battery, the left and right ends of the pole group 2 are both led out with pole lugs 3. For the pole lug 3 located at the left end of the pole group 2, the right end of the pole lug 3 is electrically connected to the pole group 2, and the left end of the pole lug 3 extends to the left from the left end of the packaging film 1; for the pole lug 3 located at the right end of the pole group 2, the left end of the pole lug 3 is electrically connected to the pole group 2, and the right end of the pole lug 3 extends to the right from the right end of the packaging film 1. An insulating member 4 is provided on the outer surface of each pole lug 3, and each insulating member 4 is connected to the packaging film 1 through a heat sealing area 5. That is, heat sealing areas 5 are provided at both left and right ends of the packaging film 1, and the insulating member 4 located at the left end is connected to the left edge of the packaging film 1 through the heat sealing area 5 located at the left end, and the insulating member 4 located at the right end is connected to the right edge of the packaging film 1 through the heat sealing area 5 located at the right end.

[0033] It is worth noting that if T1 / T>90%, the width of the heat-sealing zone 5 is too large, resulting in difficulty in heat sealing and low heat sealing efficiency; if T1 / T<10%, the width of the heat-sealing zone 5 is too small, it is difficult to ensure the heat sealing effect of the packaging film 1 and the insulating member 4, and there is still a risk of battery leakage.

[0034] It should be noted that the value of T1 / T can be any value among 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or a value between any two values.

[0035] The following tests were performed on batteries with different values ​​of T and T1, and the test results are shown in Table 1. The embodiment refers to a battery that meets the T1 / T value range required by the embodiment, and the comparative example refers to a battery that does not meet the T1 / T value range required by the embodiment.

[0036] Table 1 Test results of batteries with different values ​​of T and T1

[0037]

[0038] It can be seen from Table 1 that in Examples 1 to 12, the values ​​of T and T1 satisfy 10%≤T1 / T≤90%. Therefore, the insulating member 4 and the packaging film 1 are easy to heat seal, and there is no air leakage under the 0.9MPa internal pressure test, and the peel strength is ≥4.5N / mm under the 90° peel force test. The heat sealing strength and heat sealing effect are good, thereby ensuring the sealing of the battery.

[0039] It can be seen from Table 1 that in Comparative Example 1, T1 / T=3.33%, and therefore T1 / T<10%. The width of the heat-sealing area 5 is too small. Although it facilitates the heat-sealing process of the insulating member 4 and the packaging film 1, the battery leaks under the 0.9 MPa internal pressure test.

[0040] It can be seen from Table 1 that in Comparative Example 2, T1 / T=100%, therefore, T1 / T>90%, the width of the heat-sealed area 5 is too large, although there is no air leakage under the 0.9 MPa internal pressure test, and the peel strength is ≥4.5 N / mm under the 90° peel force test, but the heat sealing process is more difficult and the heat sealing efficiency is low, which affects the production efficiency.

[0041] In one embodiment, Figure 2 As shown, the width T of the insulating member 4 satisfies 5mm≤T≤30mm. By limiting the width of the insulating member 4, while avoiding waste of the insulating member 4 and increasing production costs, the heat sealing effect between the insulating member 4 and the packaging film 1 is ensured, the sealing of the battery is improved, and leakage is avoided.

[0042] It is worth noting that if T>30mm, the width of the insulating part 4 is too large, the required insulating part 4 consumables are too much, and the surplus of the insulating part 4 is too large, resulting in waste and increased production costs; if T<5mm, the width of the insulating part 4 is too small, and accordingly, the width of the heat-sealing area 5 will also be reduced, making it difficult to ensure the heat-sealing effect of the packaging film 1 and the insulating part 4, and there is still a risk of battery leakage.

[0043] In one embodiment, Figure 2 As shown, along the length direction of the battery, part of the insulating member 4 extends out of the corresponding end of the packaging film 1 to form a first extension portion 41. The first extension portion 41 is provided to facilitate heat sealing between the packaging film 1 and the insulating member 4, thereby ensuring a heat sealing effect.

[0044] It is worth mentioning that please refer to Figure 1The heat-sealing area 5 is located at the edge of the end of the packaging film 1. In this embodiment, the insulating member 4 is extended out of the end of the packaging film 1 to form a first extension portion 41, so that along the length direction of the battery, the edge of the heat-sealing area 5 close to the first extension portion 41 is completely located in the insulating member 4, thereby ensuring the heat-sealing effect between the packaging film 1 and the insulating member 4.

[0045] Please note that Figure 1 , along the length direction of the battery, for the insulating member 4 located at the left end, the left end of the insulating member 4 extends out of the left end of the packaging film 1; for the insulating member 4 located at the right end, the right end of the insulating member 4 extends out of the right end of the packaging film 1.

[0046] In one embodiment, Figure 2 As shown, along the length direction of the battery, the width of the first extension portion 41 is T2, which satisfies 10%≤T2 / T≤50%. By limiting the width of the first extension portion 41, while ensuring the volume energy density of the battery and avoiding an increase in production costs, it is also possible to avoid excessive glue overflow from the insulating member 4 during heat sealing, thereby affecting the quality of the tab 3 and the packaging quality of the end of the packaging film 1.

[0047] It is worth noting that if T2 / T>50%, the width of the first extension portion 41 is too large, that is, the insulating part 4 extends too much out of the end of the packaging film 1, resulting in too many consumables of the insulating part 4 required, increasing the production cost, and the insulating part 4 occupies too much external space, which will affect the volume energy density of the battery; if T2 / T<10%, the width of the first extension portion 41 is too small, that is, the insulating part 4 extends too little out of the end of the packaging film 1, which may easily lead to excessive glue overflow of the insulating part 4 during heat sealing. The overflow glue adheres to the ear 3, which will affect the quality of the ear 3 and affect the subsequent production process. The overflow glue adheres to the end of the packaging film 1, affecting the packaging quality of the packaging film 1 and affecting the production quality of the battery.

[0048] It should be noted that the value of T2 / T can be any value among 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, or a value between any two values.

[0049] The following tests were performed on batteries with different values ​​of T and T2, and the test results are shown in Table 2. The embodiment refers to a battery that meets the value range of T2 / T required by the embodiment, and the comparative example refers to a battery that does not meet the value range of T2 / T required by the embodiment.

[0050] Table 2 Test results of batteries with different values ​​of T and T2

[0051]

[0052] It can be seen from Table 2 that in Examples 1 to 8, the values ​​of T2 and T satisfy 10%≤T2 / T≤50%. Therefore, after heat sealing, the insulating part 4 has less glue overflow, has no impact on the ends of the tabs 3 and the packaging film 1, and does not affect the subsequent production. In addition, under the 0.9MPa internal pressure test, there is no air leakage, and the peel strength is ≥4.5N / mm under the 90° peel force test. The heat sealing strength and heat sealing effect are good, ensuring the sealing of the battery.

[0053] It can be seen from Table 2 that in Comparative Example 1, T2 / T=3.33%, so T2 / T<10%, resulting in excessive glue overflow after heat sealing, and the overflow glue adheres to the end of the tab 3 or the packaging film 1, affecting subsequent production.

[0054] It can be seen from Table 2 that in Comparative Example 2, T2 / T=60%, and therefore T2 / T>50%. Although there is no air leakage under the 0.9MPa internal pressure test, and the peel strength is ≥4.5N / mm under the 90° peel force test, the insulating member 4 occupies a large external space, affecting the volume energy density of the battery and increasing the cost.

[0055] In one embodiment, Figure 2 As shown, the heat-sealing area 5 is located inside the end of the corresponding packaging film 1. In this way, a portion of the packaging film 1 is reserved outside the heat-sealing area 5 to ensure the heat-sealing strength, thereby ensuring the heat-sealing effect between the insulating member 4 and the packaging film 1, improving the sealing of the battery, and avoiding leakage.

[0056] It is worth mentioning that please refer to Figure 1 Along the length direction of the battery, for the heat-sealing area 5 located at the left end, the left end of the packaging film 1 extends to the left beyond the left edge of the heat-sealing area 5; for the heat-sealing area 5 located at the right end, the right end of the packaging film 1 extends to the right beyond the right edge of the heat-sealing area 5.

[0057] In one embodiment, Figure 2 As shown, along the length direction of the battery, the distance between the edge of the heat-sealing area 5 away from the electrode group 2 and the corresponding end of the packaging film 1 is T3, which satisfies 0.1mm≤T3≤5mm. By limiting the distance between the heat-sealing area 5 and the end of the packaging film 1, the heat-sealing strength is guaranteed while ensuring the volume energy density of the battery and avoiding an increase in production costs, thereby ensuring the heat-sealing effect between the insulating member 4 and the packaging film 1, improving the sealing of the battery, and avoiding leakage.

[0058] Please note that Figure 1 , along the length direction of the battery, for the heat-sealing area 5 located at the left end, T3 refers to the distance between the left edge of the heat-sealing area 5 and the left end of the packaging film 1; for the heat-sealing area 5 located at the right end, T3 refers to the distance between the right edge of the heat-sealing area 5 and the right end of the packaging film 1.

[0059] It is worth noting that if T3>5mm, the end of the packaging film 1 extends too far beyond the edge of the heat-sealing zone 5. If the volume of the accommodating space is to be kept unchanged, the required packaging film 1 consumables will increase, resulting in a waste of production costs. If the packaging film 1 consumables remain unchanged, the accommodating space will become smaller, affecting the volume energy density of the battery. If T3<0.1mm, the end of the packaging film 1 extends too little beyond the edge of the heat-sealing zone 5, making it difficult to ensure the heat-sealing strength between the insulating part 4 and the packaging film 1, which can easily affect the heat-sealing effect, thereby affecting the sealing of the battery and posing a risk of battery leakage.

[0060] It should be noted that the value of T3 can be any value among 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or a value between any two values.

[0061] In one embodiment, Figure 2 As shown, along the length direction of the battery, part of the insulating member 4 extends from the side edge of the heat-sealing area 5 close to the electrode group 2 toward the electrode group 2 to form a second extension portion 42. By providing the second extension portion 42, the heat-sealing strength is ensured, thereby ensuring the heat-sealing effect between the insulating member 4 and the packaging film 1, improving the sealing of the battery, and avoiding leakage.

[0062] It is worth mentioning that please refer to Figure 1 , along the length direction of the battery, for the insulating member 4 located at the left end, the right end of the insulating member 4 extends to the right of the right edge of the corresponding heat-sealing area 5 (the heat-sealing area 5 located at the left end); for the insulating member 4 located at the right end, the left end of the insulating member 4 extends to the left of the left edge of the corresponding heat-sealing area 5 (the heat-sealing area 5 located at the right end).

[0063] It should be further explained that, by providing the first extension portion 41 and the second extension portion 42 , the heat-sealing area 5 is completely located in the insulating member 4 along the length direction of the battery, thereby ensuring the heat-sealing effect between the packaging film 1 and the insulating member 4 .

[0064] In one embodiment, Figure 2 As shown, along the length direction of the battery, the width of the second extension portion 42 is T4, which satisfies 1mm≤T4≤10mm. By limiting the width of the second extension portion 42, the heat sealing strength is ensured while ensuring the volume energy density of the battery and avoiding an increase in production costs, thereby ensuring the heat sealing effect between the insulating member 4 and the packaging film 1, improving the sealing of the battery, and avoiding leakage.

[0065] It is worth noting that if T4>10mm, the width of the second extension portion 42 is too large, the required consumables of the insulating part 4 increase, resulting in increased production costs, and the insulating part 4 occupies more internal space of the battery, affecting the volume energy density of the battery; if T4<1mm, the width of the second extension portion 42 is too small, it is difficult to ensure the heat sealing strength between the insulating part 4 and the packaging film 1, it is easy to affect the heat sealing effect, and then affect the sealing of the battery, there is a risk of battery leakage.

[0066] It should be noted that the value of T4 can be any value among 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 values.

[0067] The following tests were performed on batteries with different values ​​of T3 and T4, and the test results are shown in Table 3. The embodiment refers to batteries that meet the value ranges of T3 and T4 required by the embodiment, and correspondingly, the comparative example refers to batteries that do not meet the value ranges of T3 or T4 required by the embodiment.

[0068] Table 3 Test results of batteries with different values ​​of T3 and T4

[0069]

[0070]

[0071] It can be seen from Table 3 that in Examples 1 to 8, the value of T3 satisfies 0.1 mm ≤ T3 ≤ 5 mm, and the value of T4 satisfies 1 mm ≤ T4 ≤ 10 mm. Therefore, under the 0.9 MPa internal pressure test, there is no air leakage, and the peel strength is ≥ 4.5 N / mm under the 90° peel force test. The heat sealing strength and heat sealing effect are good, thereby ensuring the sealing of the battery.

[0072] It can be seen from Table 3 that in Comparative Example 1, T3=-1mm, so T3<0.1mm, the end of the packaging film 1 did not extend beyond the edge of the heat-sealed area 5, and the battery leaked under the 0.9MPa internal pressure test.

[0073] It can be seen from Table 3 that in Comparative Example 2, T4=0, so T4<1 mm, the end of the insulating member 4 did not extend beyond the edge of the heat-sealed area 5, and the battery leaked under the 0.9 MPa internal pressure test.

[0074] It can be seen from Table 3 that in Comparative Example 3, T3=6mm, T4=12mm, therefore T3>5mm, T4>10mm. Although there is no air leakage under the 0.9MPa internal pressure test, and the peel strength is ≥4.5N / mm under the 90° peel force test, the insulating member 4 occupies a large internal space and the aluminum-plastic film occupies a large external space, which affects the volume energy density of the battery and increases the cost.

[0075] In one embodiment, the packaging film 1 includes a first film body and a second film body that are arranged opposite to each other. The edges of the first film body and the second film body are connected and enclosed to form a accommodating space. The first film body and the second film body are arranged on opposite sides of the insulating part 4 along the thickness direction of the battery; at the position of the insulating part 4, the first film body and the second film body are respectively connected to the opposite sides of the insulating part 4 through the heat sealing area 5, and at the position outside the insulating part 4, the first film body and the second film body are connected through the heat sealing area 5.

[0076] It is worth noting that the first film body and / or the second film body has a punching hole, and when the first film body and the second film body are matched, the punching hole forms a space for accommodating the electrode group 2. The first film body and the second film body are side-sealed at opposite sides along the width direction of the battery, and the first film body and the second film body are top-sealed at opposite ends along the length direction of the battery (i.e., heat-sealed area 5).

[0077] It needs to be further explained that if Figure 1 As shown, each heat-sealing area 5 is extended along the width direction of the battery. Along the thickness direction of the battery, the insulating member 4 is located between the first film body and the second film body; along the width direction of the battery, the insulating member 4 occupies part of the width of the first film body and the second film body, and the first film body and the second film body are directly connected through the heat-sealing area 5 at the position where the first film body and the second film body are not occupied by the insulating member 4.

[0078] It is worth mentioning that please refer to Figure 1 , the thickness direction of the battery is perpendicular to Figure 1 The direction of the drawing.

[0079] In one embodiment, the packaging film 1 is an aluminum-plastic film.

[0080] In one embodiment, the battery is a pouch cell.

[0081] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: include: A packaging film having a containing space therein; A pole group is arranged in the accommodation space; A pole ear, wherein a first end of the pole ear is electrically connected to the pole group, and a second end of the pole ear extends in a direction away from the pole group and extends out of the packaging film; An insulating member is arranged around the outer surface of the pole lug, the packaging film is hot-melted and packaged at the edge of one end where the pole lug is arranged to form a heat-sealed area, and the packaging film and the insulating member are connected and arranged through the heat-sealed area; Wherein, along the length direction of the battery, the width of the insulating member is T, and the width of the heat-sealing area is T1, satisfying 10%≤T1 / T≤90%.

2. The battery according to claim 1, characterized in that The width T of the insulating member satisfies 5 mm ≤ T ≤ 30 mm.

3. The battery according to claim 1 or 2, characterized in that: Along the length direction of the battery, part of the insulating member extends out of the corresponding end of the packaging film to form a first extension portion.

4. The battery according to claim 3, characterized in that Along the length direction of the battery, the width of the first extension portion is T2, satisfying 10%≤T2 / T≤50%.

5. The battery according to claim 1 or 2, characterized in that: The heat-sealing area is located inside the end of the corresponding packaging film.

6. The battery according to claim 5, characterized in that Along the length direction of the battery, the distance between the edge of the heat-sealed area away from the electrode group and the corresponding end of the packaging film is T3, satisfying 0.1mm≤T3≤5mm.

7. The battery according to claim 1 or 2, characterized in that: Along the length direction of the battery, part of the insulating member extends from one side edge of the heat-sealed area close to the electrode group toward the electrode group to form a second extension portion.

8. The battery according to claim 7, characterized in that Along the length direction of the battery, the width of the second extension portion is T4, satisfying 1mm≤T4≤10mm.

9. The battery according to claim 1 or 2, characterized in that: The packaging film comprises a first film body and a second film body which are arranged opposite to each other, the first film body and the second film body are connected and arranged around edges to enclose the accommodation space, and the first film body and the second film body are arranged on two opposite sides of the insulating member along the thickness direction of the battery; At the position of the insulating member, the first film body and the second film body are respectively connected to the two opposite sides of the insulating member through the heat sealing area, and at the position outside the insulating member, the first film body and the second film body are connected and arranged through the heat sealing area.

10. The battery according to claim 1 or 2, characterized in that: The packaging film is an aluminum-plastic film.

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