Soft package battery and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a soft package battery and a battery pack, the soft package battery comprises a pole group, a first packaging film and a second packaging film; the first packaging film is provided with a containing groove used for installing the pole group, and the pole group is arranged in the containing groove; the second packaging film is arranged opposite to the first packaging film, packaging areas surrounding the periphery of the containing groove are reserved between the second packaging film and the first packaging film, and the packaging areas are fixed through hot melting plastic package so that the pole group can be packaged in the containing groove; wherein the depth of the accommodating groove is H, the thickness of the first packaging film is T1, the thickness of the second packaging film is T2, the thickness of the soft package battery is T3, and H is larger than or equal to (T3-T1-T2) / 1.1 and smaller than or equal to (T3-T1-T2) / 0.9. By limiting the relationship among the depth of the accommodating groove, the thickness of the first packaging film, the thickness of the second packaging film and the thickness of the soft package battery, the depth of the accommodating groove is maintained in a proper range, and the assembling effect of the pole group can be improved.

Description

Technical Field

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

[0002] Soft-pack batteries usually refer to batteries whose outer shell is encapsulated by aluminum-plastic composite film. Soft-pack batteries have the advantages of light weight, low mold cost and high safety.

[0003] The soft-pack battery is mainly composed of a tab, a pole group, and a packaging film. The packaging film packages the pole group and the tab and seals them by hot pressing. However, when the existing soft-pack battery packages the pole group, it is difficult to effectively balance the assembly size of the packaging film and the pole group, resulting in the pole group assembly being too loose or difficult to close the package, that is, the pole group assembly effect is poor. Summary of the invention

[0004] In view of this, the present invention provides a soft-pack battery and a battery pack to solve the problem that it is difficult for the soft-pack battery to effectively balance the assembly dimensions of the packaging film and the electrode group, resulting in poor electrode group assembly effect.

[0005] In a first aspect, the present invention provides a soft pack battery, comprising:

[0006] Pole group;

[0007] A first packaging film, on which a receiving groove for mounting the electrode group is provided, and the electrode group is arranged in the receiving groove;

[0008] A second packaging film is arranged opposite to the first packaging film and has a packaging area around the receiving groove reserved with the first packaging film, and the packaging area is fixed by hot-melt plastic sealing to package the electrode group in the receiving groove;

[0009] Among them, the depth of the accommodating groove is H, the thickness of the first packaging film is T1, the thickness of the second packaging film is T2, and the thickness of the soft-pack battery is T3, satisfying (T3-T1-T2) / 1.1≤H≤(T3-T1-T2) / 0.9.

[0010] Beneficial effect: When assembling the soft-pack battery of the present invention, the electrode group is first installed in the receiving groove of the first packaging film, and then the second packaging film is covered on the first packaging film. Finally, the packaging area formed between the first packaging film and the second packaging film is subjected to hot melt plastic sealing treatment to fix the first packaging film and the second packaging film, and the electrode group is packaged in the receiving groove. By limiting the relationship between the depth of the receiving groove, the thickness of the first packaging film, the thickness of the second packaging film and the thickness of the soft-pack battery, the depth of the receiving groove is maintained within a suitable range, which can not only ensure the compact assembly of the electrode group, shorten the vacuum pumping time, and avoid excessive electrolyte injection, but also save materials, reduce the weight of the electrode group, and facilitate subsequent assembly, thereby improving the assembly effect of the electrode group and improving the volume energy density of the soft-pack battery.

[0011] In an optional implementation, the thickness T1 of the first packaging film is equal to the thickness T2 of the second packaging film, and the depth H of the receiving groove satisfies (T3-2T1) / 1.1≤H≤(T3-2T1) / 0.9.

[0012] Beneficial effect: The thickness of the first packaging film is equal to the thickness of the second packaging film, which is conducive to maintaining the structural balance of the soft-pack battery, reducing stress concentration, improving the overall stability of the soft-pack battery, and reducing the difficulty of designing the depth of the accommodating groove.

[0013] In an optional implementation, a depth H of the receiving groove satisfies 1 mm ≤ H ≤ 50 mm.

[0014] Beneficial effect: The depth H of the accommodating groove needs to be adapted to the thickness setting of the electrode group. The depth H of the accommodating groove satisfies 1mm≤H≤50mm, and can be adapted to the use of most electrode groups to expand the scope of application.

[0015] In an optional implementation, the thickness T3 of the soft-pack battery satisfies 1mm≤T3≤100mm.

[0016] Beneficial effects: The soft-pack battery is thin, relatively simple to manufacture, and can adapt to various types of electrode group assembly.

[0017] In an optional embodiment, the packaging area forms a side plastic area in the length direction of the first packaging film and the second packaging film, and a transition area is left between the side plastic area and the notch of the accommodating groove, and the width W1 of the transition area satisfies 1mm≤W1≤15mm, and the width W2 of the side plastic area satisfies 3mm≤W2≤15mm;

[0018] The peripheral side of the first packaging film and the peripheral side of the second packaging film are aligned, and a margin W3 from the side plastic area to the peripheral side of the first packaging film or the peripheral side of the second packaging film satisfies 0.5mm≤W3≤10mm.

[0019] Beneficial effects: By limiting the width W1 of the transition zone between the side plastic zone and the notch of the receiving groove, it is possible to provide expansion space for the electrode group during use of the electrode group, thereby preventing the electrode group from squeezing the receiving groove. By limiting the width W2 of the side plastic zone, the processing range of the side plastic zone can be reduced, the packaging effect of the side plastic zone can be improved, and the side seal defective products can be reduced, thereby improving the yield of the soft-pack battery. By limiting the margin W3 from the side plastic zone to the peripheral side of the first packaging film or the peripheral side of the second packaging film, it is possible to effectively avoid glue overflow in the side plastic zone.

[0020] In an optional implementation, the width W1 of the transition zone and the depth H of the receiving groove satisfy 0.15≤W1 / H≤1.

[0021] Beneficial effect: By limiting the proportional relationship between the width of the transition zone and the depth of the accommodating groove, it is possible to prevent the pole group from expanding and pulling the first packaging film and the second packaging film, thereby applying a force to the side plastic zone to improve the stability of the side plastic zone.

[0022] In an optional embodiment, in the length direction of the first packaging film and the second packaging film, a distance W from the notch of the accommodating groove to the peripheral side of the first packaging film or the peripheral side of the second packaging film satisfies 4.5 mm≤W≤40 mm.

[0023] Beneficial effect: By regulating the distance from the notch of the accommodating groove to the peripheral side of the first packaging film or the peripheral side of the second packaging film, it is possible to minimize material waste and reduce the difficulty of assembling the soft-pack battery while ensuring the sealing effect of the soft-pack battery.

[0024] In an optional embodiment, a positive electrode tab and a negative electrode tab are respectively provided at opposite ends of the electrode group in the length direction, and the positive electrode tab and the negative electrode tab extend outside the first packaging film and the second packaging film.

[0025] Beneficial effect: The positive and negative electrodes are installed at opposite ends of the electrode group in the length direction, which facilitates the connection and layout of the positive and negative electrodes with the connecting sheet. The positive and negative electrodes extend outside the first packaging film and the second packaging film, which will not affect the sealing of the side plastic area.

[0026] In an optional embodiment, a gap is left between the pole group and the wall of the accommodating groove.

[0027] Beneficial effects: A gap is left between the electrode group and the wall of the receiving groove, which can reserve expansion space for the electrode group, prevent the electrode group from directly contacting the aluminum-plastic film, reduce the risk of short circuit, and ensure the safety of the battery. Under extreme conditions, such as overcharge, over discharge or short circuit, the gap can also help release gas and pressure to reduce the risk of explosion or leakage. Moreover, the gap can also reserve installation space for the electrode group, ensuring that the electrode group can be smoothly installed in the receiving groove, avoiding assembly difficulties caused by dimensional tolerance of the electrode group.

[0028] In a second aspect, the present invention further provides a battery pack, comprising: the above-mentioned soft-pack battery.

[0029] Beneficial effect: Because the battery pack includes a soft-pack battery, it has the same effect as the soft-pack battery and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] Figure 1 This is a schematic structural diagram of a soft-pack battery according to an embodiment of the present invention;

[0032] Figure 2 for Figure 1 A cross-sectional view of the AA soft pack battery shown;

[0033] Figure 3 for Figure 2 A partial enlarged schematic diagram of B in the figure.

[0034] Description of reference numerals:

[0035] 1. Pole group; 101. Positive electrode ear; 102. Negative electrode ear; 2. First packaging film; 201. Accommodating groove; 3. Second packaging film; 4. Side plastic area. DETAILED DESCRIPTION

[0036] 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.

[0037] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0038] According to an embodiment of the present invention, on one hand, a soft-pack battery is provided, comprising: an electrode group 1, a first packaging film 2, and a second packaging film 3. The first packaging film 2 is provided with a receiving groove 201 for mounting the electrode group 1, and the electrode group 1 is arranged in the receiving groove 201. The second packaging film 3 is arranged opposite to the first packaging film 2 and has a packaging area around the receiving groove 201 reserved with the first packaging film 2, and the packaging area is fixed by hot melt plastic sealing to encapsulate the electrode group 1 in the receiving groove 201.

[0039] Among them, see Figure 3 , the depth of the receiving groove 201 is H, the thickness of the first packaging film 2 is T1, the thickness of the second packaging film 3 is T2, and the thickness of the soft-pack battery is T3, satisfying (T3-T1-T2) / 1.1≤H≤(T3-T1-T2) / 0.9.

[0040] The soft-pack battery provided in the embodiment of the present invention is assembled by first installing the electrode group 1 in the receiving groove 201 of the first packaging film 2, then covering the second packaging film 3 on the first packaging film 2, and finally performing a hot melt plastic sealing process on the packaging area formed between the first packaging film 2 and the second packaging film 3 to fix the first packaging film 2 and the second packaging film 3, and encapsulating the electrode group 1 in the receiving groove 201. By limiting the relationship between the depth of the receiving groove 201, the thickness of the first packaging film 2, the thickness of the second packaging film 3 and the thickness of the soft-pack battery, the depth of the receiving groove 201 is maintained within a suitable range, which can not only ensure that the electrode group 1 is assembled compactly, shorten the vacuuming time, and avoid excessive injection of the electrolyte, but also save materials, reduce the weight of the electrode group 1, and facilitate subsequent assembly, thereby improving the assembly effect of the electrode group 1 and improving the volume energy density of the soft-pack battery.

[0041] It should be noted that if the depth H of the receiving groove 201 is too large, the overall assembly of the soft-pack battery will be too loose, the vacuuming time will be increased, too much electrolyte will be injected, the assembly ratio will be too large, resulting in material waste, and after the soft-pack battery is formed, the surface is prone to obvious depressions, thereby affecting the assembly of the PACK end. The PACK end refers to the process of soft-pack battery assembly to form a battery pack. If the depth H of the receiving groove 201 is too small, it is difficult to assemble the electrode group 1.

[0042] In one embodiment, see Figure 1 The soft-pack battery can be a rectangular structure, and the first packaging film 2 and the second packaging film 3 are correspondingly square sheets. The first packaging film 2 is formed with a receiving groove 201 by stamping. The electrode group 1 is installed in the receiving groove 201, that is, the electrode group 1 is wrapped by the first packaging film 2 and the second packaging film 3.

[0043] Of course, in other alternative embodiments, the soft-pack battery may also be in other shapes, such as a disc shape, an elliptical cylinder shape, etc. Correspondingly, the first packaging film 2, the second packaging film 3 and the electrode group 1 are adapted to be arranged.

[0044] It should be noted that the materials of the first packaging film 2 and the second packaging film 3 of the embodiment of the present invention can be selected according to actual conditions. For example, the first packaging film 2 and the second packaging film 3 are aluminum-plastic films.

[0045] It should be further explained that the thickness T1 of the first packaging film 2 and the thickness T2 of the second packaging film 3 can be equal or unequal according to actual conditions.

[0046] In one embodiment, the thickness T1 of the first packaging film 2 is equal to the thickness T2 of the second packaging film 3, and the depth H of the receiving groove 201 satisfies (T3-2T1) / 1.1≤H≤(T3-2T1) / 0.9, for example, H=T3-2T1. Or, (T3-2T2) / 1.1≤H≤(T3-2T2) / 0.9. That is, 0.9≤(T3-2T1) / H≤1.1, or 0.9≤(T3-2T2) / H≤1.1. The thickness of the first packaging film 2 is equal to the thickness of the second packaging film 3, which is beneficial to maintain the structural balance of the soft-pack battery, reduce stress concentration, improve the overall stability of the soft-pack battery, and reduce the difficulty of designing the depth of the receiving groove 201.

[0047] In other alternative embodiments, the thickness T1 of the first packaging film 2 may be greater than the thickness T2 of the second packaging film 3 , or may be less than the thickness T2 of the second packaging film 3 according to actual conditions.

[0048] Further, in one embodiment, see Figure 3 The depth H of the receiving groove 201 needs to be adapted to the thickness of the electrode group 1, and the depth H of the receiving groove 201 satisfies 1mm≤H≤50mm, for example, H is 10mm, 15mm, 30mm, etc. By limiting the depth H of the receiving groove 201, it can be adapted to the use of most types of electrode groups 1 to expand the application range.

[0049] Further, in one embodiment, see Figure 3 The thickness T3 of the soft-pack battery satisfies 1mm≤T3≤100mm, for example, T3 is 1mm, 10mm, 50mm, etc. The soft-pack battery is thin, relatively simple to manufacture, and can adapt to the assembly of various types of electrode groups 1.

[0050] In one embodiment, see Figure 3, the packaging area forms a side plastic area 4 in the length direction of the first packaging film 2 and the second packaging film 3. A transition area is left between the side plastic area 4 and the notch of the accommodating groove 201, and the width W1 of the transition area satisfies 1mm≤W1≤15mm, and the width W2 of the side plastic area 4 satisfies 3mm≤W2≤15mm. The peripheral side of the first packaging film 2 and the peripheral side of the second packaging film 3 are aligned, and the margin W3 from the side plastic area 4 to the peripheral side of the first packaging film 2 or the peripheral side of the second packaging film 3 satisfies 0.5mm≤W3≤10mm. For example, W1 is 1mm, 10mm, 15mm, etc., W2 is 3mm, 10mm, 15mm, etc., and W3 is 0.5mm, 5mm, 10mm, etc. For the length direction of the first packaging film 2 and the second packaging film 3, please refer to Figure 1 Arrow L in the diagram.

[0051] By limiting the width W1 of the transition zone between the side plastic zone 4 and the notch of the receiving groove 201, it is possible to provide expansion space for the electrode group 1 during the use of the electrode group 1, thereby preventing the electrode group 1 from squeezing the receiving groove 201. By limiting the width W2 of the side plastic zone 4, the processing range of the side plastic zone 4 can be reduced, the packaging effect of the side plastic zone 4 can be improved, and the side sealing defective products can be reduced, thereby improving the yield of the soft-pack battery. By limiting the margin W3 from the side plastic zone 4 to the peripheral side of the first packaging film 2 or the peripheral side of the second packaging film 3, it is possible to effectively avoid glue overflow in the side plastic zone 4.

[0052] Further, in one embodiment, see Figure 3 , the width W1 of the transition zone and the depth H of the receiving groove 201 satisfy 0.15≤W1 / H≤1. For example, W1 / H is 0.2, 0.5, 1, etc. By limiting the proportional relationship between the width of the transition zone and the depth of the receiving groove 201, it is possible to prevent the electrode group 1 from expanding and pulling the first packaging film 2 and the second packaging film 3, thereby applying a force to the side plastic zone 4 to improve the stability of the side plastic zone 4.

[0053] Furthermore, in one embodiment, see Figure 3 In the length direction of the first packaging film 2 and the second packaging film 3, the spacing W from the notch of the receiving groove 201 to the peripheral side of the first packaging film 2 or the peripheral side of the second packaging film 3 satisfies 4.5mm≤W≤40mm. For example, W is 4.5mm, 20mm, 30mm, etc. Since the peripheral side of the first packaging film 2 is aligned with the peripheral side of the second packaging film 3, the spacing from the notch of the receiving groove 201 to the peripheral side of the first packaging film 2 is equal to or the spacing from the notch of the receiving groove 201 to the peripheral side of the second packaging film 3.

[0054] By regulating the distance from the notch of the receiving groove 201 to the peripheral side of the first packaging film 2 or the peripheral side of the second packaging film 3, it is possible to minimize material waste and reduce the difficulty of assembling the soft-pack battery while ensuring the sealing effect of the soft-pack battery.

[0055] In one embodiment, see Figure 1 , positive electrode ears 101 and negative electrode ears 102 are respectively provided at opposite ends of the length direction of the electrode group 1, and the positive electrode ears 101 and negative electrode ears 102 extend outside the first packaging film 2 and the second packaging film 3. The positive electrode ears 101 and the negative electrode ears 102 are installed at opposite ends of the length direction of the electrode group 1, which facilitates the connection and layout of the positive electrode ears 101 and the negative electrode ears 102 with the connecting sheet. The positive electrode ears 101 and the negative electrode ears 102 extend outside the first packaging film 2 and the second packaging film 3, which will not affect the sealing of the side plastic area 4.

[0056] Specifically, see Figure 1 The positive electrode ear 101 and the negative electrode ear 102 may be in a rectangular sheet-like structure with a large welding area to facilitate welding and assembly of the positive electrode ear 101 and the negative electrode ear 102 .

[0057] In one embodiment, see Figure 2 and Figure 3 , a gap is left between the electrode group 1 and the wall of the receiving groove 201. The gap can reserve expansion space for the electrode group 1, prevent the electrode group 1 from directly contacting the packaging film, reduce the risk of short circuit, and ensure the safety of the battery. Under extreme conditions, such as overcharging, over-discharging or short circuit, the gap can also help release gas and pressure to reduce the risk of explosion or leakage. Moreover, the gap can also reserve installation space for the electrode group 1, ensuring that the electrode group 1 can be smoothly installed in the receiving groove 201, avoiding assembly difficulties caused by dimensional tolerance of the electrode group 1.

[0058] The process parameters of the soft-pack battery in the embodiment of the present invention are further described in detail below in conjunction with specific embodiments. These examples should not be construed as limiting the scope of protection claimed by the present invention.

[0059] Embodiment 1:

[0060] The thickness T1 of the first packaging film 2 is equal to the thickness T2 of the second packaging film 3. The thickness T1 of the first packaging film 2 and the thickness of the soft-pack battery are T3, satisfying T3-2T1=6.6mm. The width W1 of the transition zone is 1mm, and the depth H of the receiving groove 201 is 6.5mm. The proportional relationship between the width W1 of the transition zone and the depth H of the receiving groove 201 satisfies W1 / H=0.15, at which time W1 / H takes the lower limit value. And (T3-2T2) / H=1.02, that is, H=(T3-2T2) / 1.02. The test and verification results of the soft-pack battery production line are shown in Table 1.

[0061] Embodiment 2:

[0062] The thickness T1 of the first packaging film 2 is equal to the thickness T2 of the second packaging film 3. The thickness T1 of the first packaging film 2 and the thickness of the soft-pack battery are T3, satisfying T3-2T1=2.7mm. The width W1 of the transition zone is 2mm, and the depth H of the receiving groove 201 is 3mm. The proportional relationship between the width W1 of the transition zone and the depth H of the receiving groove 201 satisfies W1 / H=0.67. And (T3-2T2) / H=0.9, that is, H=(T3-2T2) / 0.9, at this time (T3-2T2) / H takes the lower limit value. The test and verification results of the soft-pack battery production line are shown in Table 1.

[0063] Embodiment 3:

[0064] The thickness T1 of the first packaging film 2 is equal to the thickness T2 of the second packaging film 3. The thickness T1 of the first packaging film 2 and the thickness of the soft-pack battery are T3, satisfying T3-2T1=2.2mm. The width W1 of the transition zone is 1mm, and the depth H of the receiving groove 201 is 2mm. The proportional relationship between the width W1 of the transition zone and the depth H of the receiving groove 201 satisfies W1 / H=0.5. And (T3-2T2) / H=1.1, that is, H=(T3-2T2) / 1.1, at this time (T3-2T2) / H takes the upper limit value. The test and verification results of the soft-pack battery production line are shown in Table 1.

[0065] Embodiment 4:

[0066] The thickness T1 of the first packaging film 2 is equal to the thickness T2 of the second packaging film 3. The thickness T1 of the first packaging film 2 and the thickness T3 of the soft-pack battery satisfy T3-2T1=4.9mm. The width W1 of the transition zone is 2mm, and the depth H of the receiving groove 201 is 5mm. The proportional relationship between the width W1 of the transition zone and the depth H of the receiving groove 201 satisfies W1 / H=0.4. And (T3-2T2) / H=0.98, that is, H=(T3-2T2) / 0.98. The test results of the soft-pack battery production line are shown in Table 1.

[0067] Comparative Example 1:

[0068] The thickness T1 of the first packaging film 2 is equal to the thickness T2 of the second packaging film 3. The thickness T1 of the first packaging film 2 and the thickness of the soft-pack battery are T3, satisfying T3-2T1=14.3mm. The width W1 of the transition zone is 2mm, and the depth H of the accommodating groove 201 is 14mm. The proportional relationship between the width W1 of the transition zone and the depth H of the accommodating groove 201 satisfies W1 / H=0.14. At this time, W1 / H is less than 0.15, which exceeds the lower limit value of the embodiment of the present invention. And (T3-2T2) / H=1.02, that is, H=(T3-2T2) / 1.02. The test and verification results of the soft-pack battery production line are shown in Table 1.

[0069] Comparative Example 2:

[0070] The thickness T1 of the first packaging film 2 is equal to the thickness T2 of the second packaging film 3. The thickness T1 of the first packaging film 2 and the thickness of the soft-pack battery are T3, satisfying T3-2T1=2.64mm. The width W1 of the transition zone is 2mm, and the depth H of the accommodating groove 201 is 3mm. The proportional relationship between the width W1 of the transition zone and the depth H of the accommodating groove 201 satisfies W1 / H=0.67. And (T3-2T2) / H=0.88, that is, H=(T3-2T2) / 0.88, at this time (T3-2T2) / H is less than 0.9, which exceeds the lower limit value of the embodiment of the present invention. The results of the soft-pack battery production line test verification are shown in Table 1.

[0071] Comparative Example 3:

[0072] The thickness T1 of the first packaging film 2 is equal to the thickness T2 of the second packaging film 3. The thickness T1 of the first packaging film 2 and the thickness of the soft-pack battery are T3, satisfying T3-2T1=3.39mm. The width W1 of the transition zone is 2.5mm, and the depth H of the accommodating groove 201 is 3mm. The proportional relationship between the width W1 of the transition zone and the depth H of the accommodating groove 201 satisfies W1 / H=0.83. And (T3-2T2) / H=1.13, that is, H=(T3-2T2) / 1.13, at this time (T3-2T2) / H is greater than 1.1, which exceeds the lower limit value of the embodiment of the present invention. The results of the soft-pack battery production line test verification are shown in Table 1.

[0073] Table 1: Test results

[0074]

[0075] It can be seen from Table 1 that in Examples 1 to 4, 0.9≤(T3-2T1) / H≤1.1 and 0.15≤W1 / H≤1 are satisfied, and the width W1 of the transition zone satisfies 1mm≤W1≤15mm, and the depth H of the accommodating groove 201 satisfies 1mm≤H≤50mm, which can meet the assembly requirements of the soft-pack battery and save materials.

[0076] W1 / H in comparative example 1 is lower than the lower limit of the embodiment of the present invention. After the electrode group 1 expands, it pulls the first packaging film 2 and the second packaging film 3, thereby exerting a force on the side plastic area 4, resulting in sealing failure.

[0077] In comparative example 2, (T3-2T2) / H=0.88 is lower than the lower limit value of the embodiment of the present invention, which makes it difficult to close the first packaging film 2 and the second packaging film 3 and assemble the electrode group 1.

[0078] In Comparative Example 3, (T3-2T2) / H=1.13 exceeds the upper limit value of the embodiment of the present invention, resulting in the overall assembly of the soft-pack battery being too loose, the vacuum pumping time being increased, the electrolyte being injected too much, and the assembly ratio being too large, resulting in material waste.

[0079] According to an embodiment of the present invention, on the other hand, a battery pack is provided, including: a soft-pack battery.

[0080] Because the battery pack includes a soft-pack battery, it has the same effect as the soft-pack battery and will not be described in detail here.

[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 soft pack battery, characterized in that: include: Pole group; A first packaging film, on which a receiving groove for mounting the electrode group is provided, and the electrode group is arranged in the receiving groove; A second packaging film is arranged opposite to the first packaging film and has a packaging area around the receiving groove reserved with the first packaging film, and the packaging area is fixed by hot-melt plastic sealing to package the electrode group in the receiving groove; Among them, the depth of the accommodating groove is H, the thickness of the first packaging film is T1, the thickness of the second packaging film is T2, and the thickness of the soft-pack battery is T3, satisfying (T3-T1-T2) / 1.1≤H≤(T3-T1-T2) / 0.

9.

2. The soft pack battery according to claim 1, characterized in that: The thickness T1 of the first packaging film is equal to the thickness T2 of the second packaging film, and the depth H of the receiving groove satisfies (T3-2T1) / 1.1≤H≤(T3-2T1) / 0.

9.

3. The soft pack battery according to claim 2, characterized in that: The depth H of the receiving groove satisfies 1mm≤H≤50mm.

4. The soft pack battery according to claim 3, characterized in that: The thickness T3 of the soft-pack battery satisfies 1mm≤T3≤100mm.

5. The soft pack battery according to claim 3, characterized in that: The packaging area forms a side plastic area in the length direction of the first packaging film and the second packaging film, and a transition area is left between the side plastic area and the notch of the accommodating groove, and the width W1 of the transition area satisfies 1mm≤W1≤15mm, and the width W2 of the side plastic area satisfies 3mm≤W2≤15mm; The peripheral side of the first packaging film and the peripheral side of the second packaging film are aligned, and a margin W3 from the side plastic area to the peripheral side of the first packaging film or the peripheral side of the second packaging film satisfies 0.5mm≤W3≤10mm.

6. The soft pack battery according to claim 5, characterized in that: The width W1 of the transition zone and the depth H of the receiving groove satisfy 0.15≤W1 / H≤1.

7. The soft pack battery according to claim 5, characterized in that: In the length direction of the first packaging film and the second packaging film, a distance W from the notch of the receiving groove to the peripheral side of the first packaging film or the peripheral side of the second packaging film satisfies 4.5 mm≤W≤40 mm.

8. The soft pack battery according to any one of claims 1 to 7, characterized in that: A positive electrode tab and a negative electrode tab are respectively disposed at opposite ends of the electrode group in the length direction, and the positive electrode tab and the negative electrode tab extend outside the first packaging film and the second packaging film.

9. The soft pack battery according to any one of claims 1 to 7, characterized in that: A gap is left between the pole group and the slot wall of the containing slot.

10. A battery pack, characterized in that: include: The soft pack battery according to any one of claims 1 to 9.

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