Pouch cell and battery pack

Abstract

The utility model provides a kind of soft package battery and battery pack, soft package battery includes first shell, second shell, electric core and current output piece, the edge of first shell forms first flanging;The edge of second shell forms second flanging, first flanging and second flanging can mutually butt joint and form sealing edge, to form accommodating cavity between first shell and second shell, sealing edge is formed with the electrode lead-out hole that will accommodating cavity and outside communicate;Electric core is located in accommodating cavity;Current output piece is worn and fixed in electrode lead-out hole, the first end of current output piece is connected in electric core, the second end of current output piece is worn out electrode lead-out hole, and second end is bent towards the direction of second shell;In the extension direction of electrode lead-out hole, the size of first flanging is d1mm, the size of second flanging is d2mm, d1>d2, this soft package battery can make tab bend towards normal working direction, reduce lap joint short-circuit phenomenon.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a soft-pack battery and a battery pack. Background Technology

[0002] In related technologies, the tabs of pouch batteries are usually led out from the side of the casing and bent to connect to other electronic components. However, since the tabs themselves are usually made of soft material, the tabs may be bent in different directions during the assembly of pouch batteries. When the tabs are bent in a direction that does not conform to the normal operating direction, the tabs are prone to contact with other electronic components, which can cause a short circuit. Utility Model Content

[0003] In view of the above-mentioned technical problems, this utility model provides a soft-pack battery and battery pack, so that the tabs can be bent in the normal working direction, reducing the phenomenon of short circuit due to overlap, thereby at least partially solving the above-mentioned technical problems.

[0004] In a first aspect, this utility model provides a soft-pack battery, comprising: a first housing, the edge of which forms a first flange; a second housing, the edge of which forms a second flange, the first flange and the second flange being able to abut each other to form a sealing edge, thereby forming a receiving cavity between the first housing and the second housing, wherein an electrode lead-out hole is formed on the sealing edge to communicate the receiving cavity with the outside; a battery cell disposed within the receiving cavity; and a current output member, the current output member being inserted through and fixed to the electrode lead-out hole, a first end of the current output member being connected to the battery cell, and a second end of the current output member extending out of the electrode lead-out hole, the second end being bent toward the second housing; in the extending direction of the electrode lead-out hole, the dimension of the first flange is d1mm, the dimension of the second flange is d2mm, and d1>d2.

[0005] Secondly, this utility model provides a battery pack, including an insulating component, a conductive strip, and a soft-pack battery as described above. The number of soft-pack batteries is at least two. The insulating component is provided with through holes. The current output components of the soft-pack batteries are correspondingly inserted through the through holes and bent toward the conductive strip. The conductive strip is fixedly connected to the insulating component.

[0006] Through the above technical solution, namely the soft-pack battery provided by this utility model, when assembling and packaging the soft-pack battery, the battery cell can be placed on the first shell or the second shell firstly, the first end of the current output component can be connected to the battery cell, and after the relative positions of the current output component and the first shell or the second shell are arranged, the first shell and the second shell are aligned so that the first flange and the second flange are aligned with each other and form a sealing edge, allowing the current output component to pass through the electrode lead-out hole formed between the first flange and the second flange, thus completing the packaging of the soft-pack battery. Furthermore, in the extension direction of the electrode lead-out hole, the size d2 of the second flange is smaller than the size d1 of the first flange, and the current output component can also be bent towards the second shell after packaging. Moreover, since the size of the second flange is shorter, it can provide sufficient clearance for the current output component to be bent. In summary, the soft-pack battery can guide the current output component 4 by making the width of the second flange smaller than the width of the first flange, thereby reducing the possibility of short circuits between the current output component and other electronic components during the assembly of the soft-pack battery and improving the safety performance of the soft-pack battery. Attached Figure Description

[0007] To more clearly illustrate the specific embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0008] Figure 1 This is a top view of a soft-pack battery provided in an exemplary embodiment of the present utility model; Figure 2 This is a front view and a schematic diagram of the internal structure of a soft-pack battery provided in an exemplary embodiment of this utility model; Figure 3 yes Figure 2 A magnified view of a portion of position A in the middle; Figure 4 This is a front view of the soft-pack battery and its internal structure provided in an exemplary embodiment of the present utility model, wherein the current output element is led out from both sides of the battery cell; Figure 5 This is a front view of the soft-pack battery and its internal structure provided in an exemplary embodiment of the present invention, wherein the current output element is led out from the same side of the battery cell; Figure 6 This is a schematic diagram of the structure of the first housing and the second housing provided in an exemplary embodiment of this utility model; Figure 7 This is a schematic diagram of the battery pack provided in an exemplary embodiment of the present invention.

[0009] Explanation of reference numerals in the attached figures: 1. First housing; 101. Receiving cavity; 102. Electrode lead-out hole; 120. First flange; 2. Second shell; 220. Second flange; 3. Battery cells; 4. Current output component; 410. Lead-out section; 420. Bending section; 5. Sealing element; 510. First sealing part; 520. Second sealing part; 6. Insulating components; 610. Through holes; 7. Conductive strip. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0011] In related technologies, the tabs of pouch batteries are usually led out from the side of the casing and bent to connect to other electronic components. However, since the tabs themselves are usually made of soft material, the tabs may be bent in different directions during the assembly of pouch batteries. When the tabs are bent in a direction that does not conform to the normal operating direction, the tabs are prone to contact with other electronic components, which can cause a short circuit.

[0012] In view of the above-mentioned technical problems, the first aspect of this utility model provides a soft-pack battery, as shown in the reference. Figures 1 to 6 As shown, the soft-pack battery includes a first housing 1, a second housing 2, a battery cell 3, and a current output component 4. The first housing 1 has a first flange 120 formed on its edge; the second housing 2 has a second flange 220 formed on its edge. The first flange 120 and the second flange 220 can be mated together to form a sealing edge, so that a receiving cavity 101 is formed between the first housing 1 and the second housing 2. An electrode lead-out hole 102 is formed on the sealing edge to connect the receiving cavity 101 with the outside. The battery cell 3 is disposed in the receiving cavity 101. The current output component 4 is inserted through and fixed to the electrode lead-out hole 102. The first end of the current output component 4 is connected to the battery cell 3, and the second end of the current output component 4 extends out of the electrode lead-out hole 102 and is bent toward the second housing 2. In the extending direction of the electrode lead-out hole 102, the size of the first flange 120 is d1mm, the size of the second flange 220 is d2mm, and d1>d2.

[0013] Through the above technical solution, namely the soft-pack battery provided by this utility model, when assembling and packaging the soft-pack battery, the cell 3 can be first placed on the first housing 1 or the second housing 2, the first end of the current output component 4 can be connected to the cell 3, and after the relative positions of the current output component 4 and the first housing 1 or the second housing 2 are arranged, the first housing 1 and the second housing 2 are aligned so that the first flange 120 and the second flange 220 are aligned with each other and form a sealing edge, allowing the current output component 4 to pass through the electrode lead-out hole 102 formed between the first flange 120 and the second flange 220, thus completing the packaging of the soft-pack battery. Furthermore, at the electrode lead-out hole... In the extension direction of the outlet 102, the size d2 of the second flange 220 is smaller than the size d1 of the first flange 120. After the current output component 4 is packaged, it can also be bent toward the second housing 2. Since the second flange 220 is shorter, it can provide sufficient space for the current output component 4 to be bent. In summary, the soft-pack battery can guide the current output component 4 by making the width of the second flange 220 smaller than the width of the first flange 120. This can reduce the short circuit between the current output component 4 and other electronic components during the assembly of the soft-pack battery and improve the safety performance of the soft-pack battery.

[0014] It should be further explained that the current output device 4 mentioned in the above embodiments may include a tab and an electrode plate. The two ends of the tab are respectively connected to the electrode plate and the battery cell 3. The other end of the electrode plate can pass through the electrode lead-out hole 102 and lead outward, and make contact with other electronic components to conduct electricity. Therefore, the current output device 4 mentioned above can be understood as the connection assembly of the tab and the electrode plate.

[0015] Furthermore, the arrangement of the electrode lead-out holes 102 can be any suitable arrangement. For example, when there are multiple electrode lead-out holes 102, they can be arranged on the same side of the receiving cavity 101 and connected to the same side of the battery cell 3. Correspondingly, the first flange 120 and the second flange 220 can also be arranged on the same side of the receiving cavity 101. Alternatively, the multiple electrode lead-out holes 102 can be arranged on opposite sides of the receiving cavity 101 and connected to opposite sides of the battery cell 3. Correspondingly, the first flange 120 and the second flange 220 can also be arranged on opposite sides of the receiving cavity 101. Both of the above connection methods can achieve normal connection and encapsulation of the soft-pack battery. The specific arrangement will be described in detail below, and will not be elaborated further here.

[0016] In the above method, the first shell 1 and the second shell 2 can be designed separately, or the first shell 1 and the second shell 2 can be integrally formed, that is, the first shell 1 and the second shell 2 are formed by folding and sealing the same piece of aluminum-plastic film.

[0017] Furthermore, the extending direction of the electrode lead-out hole 102 mentioned in the above embodiment also corresponds to the length direction of the pouch cell described below, and can be understood as follows: Figure 4 , Figure 5 or Figure 6 The direction of arrow X in any of the attached diagrams is the same as that in the following diagrams.

[0018] In the above embodiments, d1 and d2 can be selected from 5mm to 20mm, such as 5mm, 10mm, 15mm, 20mm, etc., or any suitable size between any two adjacent values; d2 can be selected from 3.5mm to 19.5mm, such as 3.5mm, 5mm, 10mm, 15mm, 19mm, 19.5mm, etc., or any suitable size between any two adjacent values, as long as d1 > d2.

[0019] To facilitate understanding of the specific structure of the soft-pack battery of this utility model by those skilled in the art, the specific structure of the battery is described in this embodiment as follows.

[0020] A battery cell is the basic unit of a battery, typically consisting of a positive electrode, a negative electrode, and a separator. Lithium-ion cells primarily function by the movement of lithium ions between the positive and negative electrodes. In cylindrical cells, a three-layer thin-film structure is wound into a cylindrical electrode assembly, while in cuboid cells, the thin-film structure is wound or stacked into an electrode assembly with a roughly cuboid shape.

[0021] A positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is coated on at least one surface of the positive current collector and includes: a positive active material, a conductive agent, and a binder. The positive active material includes, but is not limited to, at least one of the following: lithium phosphates, lithium transition metal oxides and their respective modified compounds, or other conventional materials that can be used as positive electrode active materials in batteries. These positive active materials can be used alone or in combination. Lithium phosphates include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also abbreviated as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3Mn1 / 3 O2 (also known as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0022] The positive electrode conductive agent includes, but is not limited to, one or more combinations of graphite, superconducting carbon, carbon black (such as acetylene black, Ketjen black, SuperP, etc.), carbon nanotubes, graphene and carbon nanofibers.

[0023] The positive electrode binder includes, but is not limited to, one or more combinations of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), PVDF-tetrafluoroethylene-propylene terpolymer, PVDF-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, fluorinated acrylate resin, styrene-butadiene rubber, polyacrylic acid, sodium polyacrylate, polyacrylamide, polyvinyl alcohol, sodium alginate, polymethacrylic acid, carboxymethyl chitosan, etc.

[0024] The negative electrode sheet includes a negative electrode current collector and a negative electrode active layer disposed on at least one surface of the negative electrode current collector. The negative electrode current collector is a conductive metal foil, which can be made of stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, copper, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). The negative electrode active layer includes a negative electrode active material, a conductive agent, and a binder.

[0025] The negative electrode active material can be carbon-based materials such as graphite, porous carbon, hard carbon, soft carbon, and mesophase carbon microspheres, or silicon-based materials such as elemental silicon, silicon oxides, silicon-carbon composites, and silicon-nitrogen composites. The conductive agent can be conductive carbon black, carbon nanotubes, etc., and the binder can be styrene-butadiene rubber, polyacrylic acid, etc.

[0026] In some implementations, reference Figure 4 and Figure 5 As shown, d1mm-d2mm satisfies 0.5mm≤d1mm-d2mm≤3mm, and / or d1mm / d2mm satisfies 0.538≤d1 / d2≤0.975.

[0027] The above method limits the range of the width difference between the first flange 120 and the second flange 220 and / or the width ratio between the first flange 120 and the second flange 220. When the difference exceeds the maximum value and / or the ratio is too far from 1, the sealing distance between the shorter second flange 220 and the current output component 4 is too short (the sealing component 5, sealing position, and relationship will be discussed in detail below), which can easily cause sealing failure between the second flange 220 and the current output component 4, thus affecting the overall sealing performance of the soft-pack battery. Conversely, when the difference is less than the minimum value and / or the ratio is close to 1, the width of the first flange 120 is... The width d1 and the width d2 of the second flange 220 are relatively similar. After the soft-pack battery is packaged, the bending guiding effect of the current output component 4 is poor. That is, when the widths of the first flange 120 and the second flange 220 are the same or similar, the current output component 4 is prone to not being able to bend stably toward the second housing 2, which may also cause the current output component 4 to short-circuit with other electronic components. Therefore, considering all factors, limiting the range of d1mm-d2mm to 0.5mm to 3mm, and / or limiting the range of d1mm / d2mm to between 0.538 and 0.975 is a relatively reasonable arrangement.

[0028] Furthermore, in the above embodiments, the specific size of d1mm-d2mm can be any suitable size that meets the above range, such as 0.5mm, 1mm, 2mm, 3mm, etc., or it can be any size between any two adjacent values; and / or the specific size of d1mm / d2mm can also be any suitable size that meets the above range, such as 0.538, 0.6, 0.7, 0.8, 0.9, 0.975, etc., or it can be any suitable size between any two adjacent values.

[0029] In some implementations, reference Figure 4 and Figure 5 As shown, the thickness of the current output component 4 is 0.2mm-0.8mm in the height direction of the pouch battery.

[0030] Using the above method, the height direction of the pouch battery can be... Figure 4 , Figure 5 or Figure 6The direction indicated by the Z arrow in any of the attached figures, and the limitation of the thickness range of the current output component 4, can reduce the situation where the current output component 4 is too thick and difficult to bend, and can also reduce the situation where the current output component 4 is too thin and has poor current carrying capacity. Furthermore, when the thickness of the current output component 4 is less than the aforementioned minimum value, the cross-sectional area of ​​the current output component 4 in its extension direction will also be smaller, and it is easy to cause insufficient structural strength and easy tearing. Therefore, taking all factors into consideration, setting the thickness of the current output component 4 between 0.2mm and 0.8mm is a relatively reasonable range.

[0031] Furthermore, the thickness of the current output component 4 can be any suitable size within the above-mentioned range, such as 0.2mm, 0.3mm, 0.6mm, 0.8mm, etc., or it can be any suitable size between any two adjacent values ​​mentioned above.

[0032] In some implementations, reference Figure 4 and Figure 5 As shown, the current output device 4 includes a lead-out section 410 and a bending section 420. The lead-out section 410 is connected to the battery cell 3. In the extension direction of the electrode lead-out hole 102, that is, in the length direction of the soft-pack battery, the distance between the second flange 220 and the bending section 420 is d4mm, and d4mm satisfies 10.5mm≤d4mm≤53mm.

[0033] In the above manner, the size of d4 determines how much distance the current output component 4 can be used for bending, that is, in combination Figure 4 and Figure 5 As shown, a larger value of d4 provides more bending space for the current output component 4, while a smaller value of d4 results in less bending space for the current output component 4. The actual length of d4 can be selected according to the actual situation. When the value of d4 exceeds the maximum value specified above, the second flange 220 may be too short, leading to a short sealing length when the second flange 220 is subsequently sealed with the current output component 4. This can result in poor sealing between the current output component 4 and the second flange 220, affecting the overall sealing performance of the soft-pack battery. When the value of d4 exceeds the minimum value specified above, the second flange 220 may be too long, resulting in less bending of the current output component 4 towards the second housing 2, which is insufficient to guide the current output component 4. Therefore, considering all factors, limiting the range of d4mm to between 10.5mm and 53mm is a relatively reasonable layout.

[0034] Furthermore, d4 can be any suitable size within the above range, such as 10.5mm, 20mm, 30mm, 40mm, 50mm, 53mm, etc., or it can be any suitable size between any two adjacent values ​​mentioned above.

[0035] Further, refer to Figure 4 and Figure 5 As shown, d4 / d2 satisfies 0.5≤d4 / d2≤15.

[0036] By limiting the ratio of d4 to d2, the same beneficial effects can be achieved. When the range of d4 / d2 is less than the minimum value, the length of d2 is longer and the length of d4 is shorter, making it difficult to bend the current output component 4. When the range of d4 / d2 is greater than the maximum value, the length of d2 is shorter and the length of d4 is longer, which also makes it difficult to achieve a short sealing length between the current output component 4 and the second flange 220. Therefore, limiting the range of d4 / d2 to between 0.5 and 15 can ensure that the current output component 4 can be bent stably toward the second housing 2, and also ensure that the current output component 4 and the second flange 220 have a longer sealing length, thus improving the sealing performance of the soft-pack battery.

[0037] Furthermore, the specific size of d4 / d2 can be any suitable size within the above range, such as 0.5, 1, 2, 3, 7, 10, 12, 15, etc., or it can be any suitable size between any two adjacent values ​​mentioned above.

[0038] In some implementations, reference Figure 4 and Figure 5 As shown, in the extension direction of the electrode lead-out hole 102, that is, the length direction of the soft pack battery, the distance between the bent section 420 and the first flange 120 is d3mm, and d3mm satisfies 10mm-50mm.

[0039] In this way, the current output component 4 and the first flange 120 can have a sufficiently long sealing length, which ensures the sealing performance of the soft-pack battery, and allows the current output component 4 to have good insulation protection on the side in the non-bending direction, that is, the side close to the first housing 1.

[0040] It can be understood that when the value of d3 is less than the minimum value of the above range, although the current output component 4 and the first flange 120 have a sufficiently long sealing length and good insulation protection with one side of the first housing 1, the exposed length of the current output component 4 relative to the first housing 1 will also be small. This will easily cause the current output component 4 to be insufficient in length when connected to other electronic components, making it impossible to make a stable and effective connection with other electronic components.

[0041] When the value of d3 is greater than the maximum value of the above range, the length of the first flange 120 is easily too short, and the sealing length between the first flange 120 and the current output component 4 will also be small. This makes it easy for the first flange 120 and the current output component 4 to fail to form a good and effective seal during the subsequent sealing process of the soft pack battery, thereby affecting the sealing performance of the soft pack battery.

[0042] Therefore, limiting the range of d3 to 10mm-50mm satisfies the sealing performance of the pouch battery and allows the current output component 4 to be stably and effectively connected to other electronic components after the pouch battery is packaged.

[0043] Furthermore, the specific size of d3 can be any suitable size within the above range, such as 10mm, 20mm, 30mm, 40mm, 50mm, etc., or it can be any size between any two adjacent values ​​mentioned above.

[0044] Further, refer to Figure 4 and Figure 5 As shown, d3 / d1 satisfies 0.5≤d3 / d1≤10.

[0045] By limiting the range of the ratio of d3 to d1, the same beneficial effects can be achieved. When the ratio of d3 / d1 is less than the minimum value, d3 is too short and d1 is too long, resulting in a short exposed length of the current output component 4 relative to the first flange 120. After the soft-pack battery is packaged, the connection stability between the current output component 4 and other electronic components is poor. When the ratio of d3 / d1 is greater than the maximum value, d3 is too long and d1 is too short, resulting in a small sealing length between the first flange 120 and the current output component 4. During the subsequent sealing process of the soft-pack battery, the first flange 120 and the current output component 4 cannot form a good and effective seal. Therefore, considering all factors, limiting the range of d3 / d1 to between 0.5 and 10 can ensure both good connection stability between the current output component 4 and other electronic components and sufficient sealing length between the first flange 120 and the current output component 4.

[0046] Furthermore, the specific size of d3 / d1 can be any suitable size within the range mentioned above, such as 0.5, 1, 4, 6, 8, 10, etc., or any size between any two adjacent values ​​mentioned above.

[0047] In some implementations, reference Figure 4 and Figure 5As shown, the pouch battery also includes a sealing member 5 located at least partially within the electrode lead-out hole 102. The sealing member 5 is disposed between the current output member 4 and the first flange 120 and between the current output member 4 and the second flange 220. In the extending direction of the electrode lead-out hole 102, that is, the length direction of the pouch battery, the length of the sealing member 5 is greater than d1.

[0048] In the above manner, the sealing element 5 can be located between the current output element 4 and the first flange 120 and between the current output element 4 and the second flange 220 to achieve sealing of the soft-pack battery in the subsequent packaging process. Furthermore, in the extension direction of the electrode lead hole 102, the length of the sealing element 5 is greater than d1, that is, greater than the width of the first flange 120. It can also be understood that the sealing element 5 needs to extend beyond the electrode lead hole 102 in the horizontal direction. Under this arrangement, it can be ensured that the current output element 4 will not overlap or arc with the metal layer in the first housing 1 or the second housing 2.

[0049] Further, refer to Figure 4 and Figure 5 As shown, the thickness of the seal 5 is d5μm, which satisfies 30μm≤d5μm≤200μm.

[0050] In accordance with the above method, the thickness of the sealing element 5 should not be too thick or too thin. If it is too thick, it will take up too much space in the soft-pack battery, and if it is too thin, it will not achieve a good sealing effect. Therefore, the thickness d5 of the sealing element 5 is limited to between 30μm and 200μm, which can achieve a good sealing effect without taking up too much space.

[0051] The aforementioned d5 can be any suitable size within the specified range, such as 30μm, 40μm, 80μm, 150μm, 200μm, etc., or it can be any size between any two adjacent values ​​mentioned above.

[0052] Further, refer to Figure 4 and Figure 5 As shown, in the extending direction of the electrode lead-out hole 102, the distance of the seal 5 extending beyond the second flange 220 is 0.5mm-4mm.

[0053] In accordance with the above method, the distance of the seal 5 extending beyond the second flange 220 should not be too short or too long. If the distance is too short, the seal 5 may not seal firmly and the sealing performance may decrease. If the distance is too long, the seal 5 may become redundant. Therefore, the distance of the seal 5 extending beyond the second flange 220 should be limited to between 0.5 mm and 4 mm to ensure sealing performance without redundancy.

[0054] Furthermore, the distance of the seal 5 beyond the second flange 220 can be any suitable size within the above-mentioned range, such as 0.5mm, 1mm, 2mm, 3mm, 4mm, etc., or it can be any suitable size between any two adjacent values ​​mentioned above.

[0055] Specifically, refer to Figure 4 and Figure 5 As shown, the sealing member 5 includes a first sealing portion 510 disposed between the current output member 4 and the first flange 120, and a second sealing portion 520 disposed between the current output member 4 and the second flange 220; the thickness of the first sealing portion 510 is greater than the thickness of the second sealing portion 520.

[0056] By sealing the first flange 120 with the current output component 4 and the second flange 220 with the current output component 4 using the above method, the overall sealing performance of the soft-pack battery can be improved. Furthermore, when the thickness of the first sealing part 510 is greater than the thickness of the second sealing part 520, since the current output component 4 bends towards the second housing 2, the area of ​​the second sealing part 520 extending beyond the second flange 220 will also bend along with the bending of the current output component 4. Therefore, the thinner second sealing part 520 can also make the current output component 4 easier to bend.

[0057] In some implementations, reference Figures 1 to 4 as well as Figure 6 As shown, there are two electrode lead-out holes 102, which are respectively connected to the opposite sides of the receiving cavity 101, and there are two current output components 4, which are correspondingly inserted through the electrode lead-out holes 102.

[0058] In the above-described manner, where the electrode lead-out holes 102 are located on opposite sides of the receiving cavity 101, although this arrangement tends to occupy a relatively long horizontal space of the pouch battery, it can reduce the problem of the current output components 4 being too close together and generating significant heat when all are led out along the same side, thus preventing mutual interference. In other words, when the electrode lead-out holes 102 are located on the same side of the receiving cavity 101, although the length of the pouch battery is saved, the tabs of multiple current output components 4 are all led out along the same side and are too close together. The heat generated by the multiple tabs during normal operation of the pouch battery will be transferred to each other, and the tabs are prone to overheating, affecting performance. In more serious cases, the tabs may melt. Therefore, the above-described layout sacrifices the length of the pouch battery to ensure the safety of the tabs during operation.

[0059] In another implementation, refer to Figure 5As shown, there are two electrode lead-out holes 102 connected to the same side of the receiving cavity 101, and there are two current output components 4, which are correspondingly inserted through the electrode lead-out holes 102.

[0060] With the above arrangement, that is, the electrode lead-out holes 102 are set on the same side of the receiving cavity 101, although the electrodes of the multiple current output devices 4 are closer to each other and the heat generation and heat transfer are more obvious, the space of the soft pack battery in the horizontal direction can be saved. In the subsequent process of arranging the soft pack batteries in groups, the space occupied by the soft pack battery pack can also be saved, and the grouping can be arranged more conveniently.

[0061] It should be noted that those skilled in the art can choose either of the two layout methods mentioned above according to the actual situation of the soft-pack battery, that is, the electrode lead-out hole 102 is led out along the same side or both sides of the receiving cavity 101. This utility model does not limit it in too much.

[0062] In some implementations, reference Figure 4 and Figure 5 As shown, in the thickness direction of the soft-pack battery, the distance between the current output device 4 and the outer top wall of the first housing 1 is L1, and the distance between the current output device 4 and the outer bottom wall of the second housing 2 is L2. L1 is not equal to L2; and the difference between d1 and d2 is 0.6mm-3mm.

[0063] In the above-described layout, where L1 is not equal to L2, the recess for accommodating the battery cell 3 can be provided only on the first housing 1, or only on the second housing 2, or both the first housing 1 and the second housing 2 can have recesses for accommodating the battery cell 3. Furthermore, the depth of the recess in the first housing 1 can differ from the depth of the recess in the second housing 2 to satisfy the condition that L1 is not equal to L2. Regardless of the method used, the battery cell 3 can be placed between the first housing 1 and the second housing 2. Depending on the size of the battery cell 3 required for different pouch batteries, the values ​​of L1 and L2 can be adaptively changed to accommodate battery cells of different sizes. Furthermore, depending on the size of the battery cell 3, the difference between d1 and d2 is preferably between 0.6 mm and 3 mm. Within this preferred range, the current output components 4 connected to battery cells of different sizes can be bent and guided, and a good seal can be achieved.

[0064] Furthermore, the difference between d1 and d2 can be any suitable size between 0.6mm and 3mm, such as 0.6mm, 1mm, 2mm, 3mm, etc., or any suitable size between any two adjacent values.

[0065] In some implementations, reference Figure 4 and Figure 5 As shown, in the height direction of the pouch battery, the distance between the height of the end of the current output device 4 connected to the cell 3 and the central axis in the thickness direction of the pouch battery satisfies 2mm-14mm.

[0066] In the above manner, that is, there is an offset between the centerline of the thickness of the current output component 4 and the cell 3, when L1 is not equal to L2, the offset of the centerline of the thickness of the current output component 4 and the cell 3 can be equal to the difference between L1 and L2. In this way, the current output component 4 can pass through the electrode lead-out hole 102 between the first housing 1 and the second housing 2 even when the depths of the recesses of the first housing 1 and the second housing 2 are different, without overlapping or interfering with the first housing 1 and the second housing 2.

[0067] Furthermore, in the above embodiments, the central axis in the thickness direction of the pouch battery can be understood as being in... Figures 4 to 6 In any of the attached figures, the straight line connecting the points at halfway along the thickness direction of the pouch battery.

[0068] A second aspect of this utility model provides a battery pack, as referenced. Figures 1 to 7 As shown, the battery pack includes an insulating component 6, a conductive strip 7, and a pouch battery mentioned in the above embodiment. The number of pouch batteries is at least two. The insulating component 6 is provided with a through hole 610. The current output component 4 of the pouch battery is correspondingly inserted through the through hole 610 and bent toward the conductive strip 7. The conductive strip 7 is fixedly connected to the insulating component 6.

[0069] The battery pack mentioned in the above embodiments also has all the beneficial effects of the above-mentioned soft-pack batteries. This embodiment will not elaborate further here. It should be noted that the insulating member 6 can achieve insulation between multiple soft-pack batteries, thereby reducing the situation where the current output member 4 overlaps with the housing of the soft-pack battery (such as the first housing 1 or the second housing 2 mentioned above) when it is led out, and improving the safety performance of the battery pack.

[0070] In some embodiments, at least a portion of the second flange 220 passes through the through hole.

[0071] In the above manner, the second flange 220 inserted into the through hole 610 can provide protection for the lead-out section 410 of the current output component 4, preventing the current output component 4 from contacting the hole wall of the through hole 610. In addition, when integrating the soft-pack battery, the second flange 220 inserted into the through hole 610 can also reduce the space occupied by the soft-pack battery in the length direction.

[0072] Alternatively, the second flange 220 can be located outside the through hole 610, which would reduce the possibility of the second housing 2 contacting and conducting with the conductive strip 7, thereby improving the insulation performance of the battery pack.

[0073] Furthermore, in order to achieve the space reduction method mentioned in the above embodiments of the battery pack, such as... Figure 7 As shown, by inserting at least a portion of the first flange 120 into the through hole 610, in addition to having the same effect as inserting the second flange 220 into the through hole 610 as described above, the side away from the conductive strip 7 can also be insulated, thereby reducing the possibility of the current output component 4 contacting other components on the side away from the conductive strip 7 and causing a short circuit.

[0074] Similarly, refer to Figure 7 As shown, at least a portion of the first flange 120 can also be inserted into the through hole 610, which can also protect the lead-out section 410 of the current output component 4, prevent the current output component 4 from contacting the hole wall of the through hole 610, and also reduce the space occupied by the soft pack battery in the length direction.

[0075] In some implementations, reference Figures 1 to 7 As shown, the minimum distance between the through hole and the conductive strip in the length direction of the soft-pack battery is 0.5mm-3mm.

[0076] By limiting the minimum distance between the through hole and the conductive strip in the above manner, it is easier to weld the current output component 4 to the conductive strip 7 after bending, and it is also easier to install the conductive strip 7 on the insulating component 6.

[0077] Furthermore, the minimum distance between the aforementioned through hole 610 and the conductive strip 7 can be any suitable size selected between 0.5mm and 3mm, such as 0.5mm, 1mm, 2mm, 3mm, etc., or it can be any size between any two adjacent values ​​mentioned above.

[0078] Although embodiments of the present 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 present invention, and all such modifications and variations fall within the scope of protection claimed by the present invention.

Claims

1. A soft-pack battery, characterized in that, include: A first housing (1) has a first flange (120) formed at its edge. The second housing (2) has a second flange (220) formed on its edge. The first flange (120) and the second flange (220) can be connected to each other to form a sealing edge, so that a receiving cavity (101) is formed between the first housing (1) and the second housing (2). An electrode lead-out hole (102) is formed on the sealing edge to connect the receiving cavity (101) with the outside. The battery cell (3) is disposed within the receiving cavity (101); A current output component (4) is inserted into and fixed to the electrode lead-out hole (102). The first end of the current output component (4) is connected to the battery cell (3). The second end of the current output component (4) passes through the electrode lead-out hole (102) and is bent toward the second housing (2). In the extending direction of the electrode lead-out hole (102), the size of the first flange (120) is d1mm, the size of the second flange (220) is d2mm, and d1>d2.

2. The soft-pack battery according to claim 1, characterized in that, d1mm-d2mm satisfies 0.5mm≤d1mm-d2mm≤3mm, and / or d1mm / d2mm satisfies 0.538≤d1 / d2≤0.

975.

3. The soft-pack battery according to claim 2, characterized in that, In the height direction of the pouch battery, the thickness of the current output element (4) is 0.2mm-0.8mm.

4. The soft-pack battery according to claim 1, characterized in that, The current output device (4) includes a lead section (410) and a bending section (420), the lead section (410) being connected to the battery cell (3). In the extending direction of the electrode lead-out hole (102), the distance between the second flange (220) and the bent section (420) is d4mm, where d4mm satisfies 10.5mm≤d4mm≤53mm.

5. The soft-pack battery according to claim 4, characterized in that, The condition d4 / d2 satisfies 0.5≤d4 / d2≤15.

6. The soft-pack battery according to claim 4, characterized in that, In the extending direction of the electrode lead-out hole (102), the distance between the bent section (420) and the first flange (120) is d3mm, and the d3mm satisfies 10mm-50mm.

7. The soft-pack battery according to claim 6, characterized in that, d3 / d1 satisfies 0.5≤d3 / d1≤10.

8. The soft-pack battery according to claim 1, characterized in that, The pouch battery also includes a sealing element (5) located at least partially within the electrode lead-out hole (102), the sealing element (5) being disposed between the current output element (4) and the first flange (120) and between the current output element (4) and the second flange (220); In the extending direction of the electrode lead-out hole (102), the length of the seal (5) is greater than d1.

9. The soft-pack battery according to claim 8, characterized in that, The thickness of the seal (5) is d5μm, and the d5μm satisfies 30μm≤d5μm≤200μm.

10. The soft-pack battery according to claim 8, characterized in that, In the extending direction of the electrode lead-out hole (102), the distance of the seal (5) beyond the second flange (220) is 0.5mm-4mm.

11. The soft-pack battery according to claim 8, characterized in that, The sealing element (5) includes a first sealing portion (510) disposed between the current output element (4) and the first flange (120), and a second sealing portion (520) disposed between the current output element (4) and the second flange (220). The thickness of the first sealing part (510) is greater than the thickness of the second sealing part (520).

12. The soft-pack battery according to claim 1, characterized in that, The number of electrode lead-out holes (102) is two and they are respectively connected to the opposite sides of the receiving cavity (101). The number of current output components (4) is two and they are correspondingly inserted through the electrode lead-out holes (102).

13. The soft-pack battery according to claim 1, characterized in that, The number of electrode lead-out holes (102) is two and they are connected to the same side of the receiving cavity (101). The number of current output components (4) is two and they are inserted through the electrode lead-out holes (102) in a one-to-one correspondence.

14. The soft-pack battery according to claim 1, characterized in that, In the thickness direction of the soft-pack battery, the distance between the current output device (4) and the outer top wall of the first housing (1) is L1, and the distance between the current output device (4) and the outer bottom wall of the second housing (2) is L2, where L1 is not equal to L2. The difference between d1 and d2 is 0.6mm-3mm.

15. The soft-pack battery according to claim 14, characterized in that, In the height direction of the soft-pack battery, the distance between the height of the current output device (4) connected to one end of the cell (3) and the central axis of the thickness direction of the soft-pack battery is 2mm-14mm.

16. A battery pack, characterized in that, The device includes an insulating component (6), a conductive strip (7), and a soft-pack battery as described in any one of claims 1-15. The number of soft-pack batteries is at least two. The insulating component (6) is provided with a through hole (610). The current output components (4) of the soft-pack batteries are correspondingly inserted through the through hole (610) and bent toward the conductive strip (7). The conductive strip (7) is fixedly connected to the insulating component (6).

17. The battery pack according to claim 16, characterized in that, At least a portion of the second flange (220) is inserted into the through hole (610).

18. The battery pack according to claim 16, characterized in that, The minimum distance between the inner wall of the through hole (610) and the outer wall of the conductive strip (7) is 0.5mm-3mm.

19. The battery pack according to claim 16, characterized in that, The second flange (220) is located outside the through hole (610).

20. The battery pack according to claim 16, characterized in that, At least a portion of the first flange (120) passes through the through hole (610).

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