Battery and electronic equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery and electronic equipment. The battery comprises a plurality of battery cells and an interlayer, the plurality of battery cells are oppositely stacked, the interlayer is arranged between two adjacent battery cells, the interlayer comprises a first bonding layer, a second bonding layer and a buffer layer, the first bonding layer and the second bonding layer are respectively arranged on two opposite sides of the buffer layer, and the buffer layer is arranged between the first bonding layer and the second bonding layer. And the first bonding layer and the second bonding layer are respectively connected with the battery cell. Wherein the toughness of the buffer layer is higher than that of the first bonding layer and that of the second bonding layer. The electronic equipment comprises the battery. The battery provided by the utility model is good in anti-needling capability and anti-collision performance, and the electronic equipment applying the battery is high in safety performance.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and electronic equipment. Background Art

[0002] With higher demands on battery capacity and endurance, internal series batteries are becoming increasingly widely used. Internal series batteries are battery packs composed of two or more stacked cells, and adjacent cells need to be separated by a partition to prevent direct contact between the two adjacent cells, which could cause an internal short circuit in the internal series battery. Since internal series batteries need to undergo needle puncture safety testing before leaving the factory, and internal series batteries may encounter unexpected situations such as drops and impacts during transportation, storage, and use, in order to improve the needle puncture resistance and impact resistance of internal series batteries, it is necessary to improve the partition between adjacent cells to ensure the safety performance of internal series batteries. Utility Model Content

[0003] The main purpose of the present invention is to provide a battery and an electronic device, aiming to improve the battery's anti-puncture ability and anti-collision performance, and enhance the battery's safety performance.

[0004] To achieve the above objectives, the present invention provides a battery comprising:

[0005] A plurality of battery cells, wherein the plurality of battery cells are stacked relative to each other;

[0006] A partition layer is provided between two adjacent battery cells, the partition layer comprising a first adhesive layer, a second adhesive layer and a buffer layer, the first adhesive layer and the second adhesive layer are respectively provided on opposite sides of the buffer layer, and the first adhesive layer and the second adhesive layer are respectively connected to the battery cells;

[0007] The toughness of the buffer layer is higher than that of the first adhesive layer and the second adhesive layer.

[0008] In some embodiments, along a direction perpendicular to a direction from the battery cell to the separator, an edge of the separator extends beyond an edge of the battery cell.

[0009] In some embodiments, a first thermal insulation layer is provided between the first adhesive layer and the buffer layer, and a second thermal insulation layer is provided between the second adhesive layer and the buffer layer.

[0010] In some embodiments, the thickness of the partition is D, the thickness of the battery cell arranged on one side of the partition is H1, and the thickness of the battery cell arranged on the other side of the partition is H2, and D, H1 and H2 satisfy: (1-99.5%) H1≤D≤(1-97%) H1, 0≤|H1-H2|≤1.

[0011] In some embodiments, the thickness of the first thermal insulation layer is D1, the thickness of the second thermal insulation layer is D2, and D1 and D2 satisfy the following: 0≤|D1-D2|≤1.

[0012] In some embodiments, an aluminum-plastic film is provided on the side of the battery cell facing away from the partition, the width of the plurality of battery cells is the same and is W1, the width of the partition is W2, the width of the aluminum-plastic film is W3, and W1, W2, and W3 satisfy the following relationship: (1+8%)W1≤W2≤(1-10%)W3;

[0013] Among them, 20um≤W1≤60um, 30um≤W2≤80um, 40um≤W3≤100um.

[0014] In some embodiments, the first adhesive layer is a hot melt adhesive layer, and the second adhesive layer is a hot melt adhesive layer;

[0015] The melting temperature of the first adhesive layer is T1, the melting temperature of the second adhesive layer is T2, and T1 and T2 satisfy the following relationship: 0≤|T1-T2|≤1;

[0016] The thickness of the first adhesive layer is D4, the thickness of the second adhesive layer is D5, and D4 and D5 satisfy the following relationship: 0≤|D4-D5|≤1.

[0017] In some embodiments, the buffer layer is one of a polypropylene structure, a polyethylene structure, a polyurethane structure, a poly(p-phenylene terephthalamide) structure, a poly(vinylidene fluoride) structure, a polystyrene structure, a poly(perfluoroethylene) structure, a poly(methyl methacrylate) structure, a polyacrylonitrile structure, a polystyrene-co-butyl acrylate structure, a polyimide structure, and a polyacrylate structure.

[0018] In some embodiments, the porosity of the buffer layer is Satisfied: 50% ≤ ≤80%.

[0019] Correspondingly, the present invention also provides an electronic device, which includes the battery described in any one of the above embodiments.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] In the technical solution of the present invention, the battery includes a plurality of relatively stacked battery cells, and the plurality of battery cells are connected in series or in parallel to form an internal series battery. A partition is provided between two adjacent battery cells, and the partition completely separates the two adjacent battery cells so that the two adjacent battery cells do not directly contact each other, thereby ensuring that the battery does not have an internal short circuit and improving the safety of the battery. A first adhesive layer and a second adhesive layer are provided in the partition, and the first adhesive layer and the second adhesive layer stably adhere the battery cells to the partition. Even if the battery encounters sudden situations such as falling or collision, the battery cells inside the battery will not shake, which is beneficial to improving the anti-collision performance of the battery and ensuring the stability of the internal structure of the battery. The toughness of the buffer layer provided in the partition is higher than the toughness of the first adhesive layer and the second adhesive layer. The toughness here refers to the resistance of the buffer layer to breakage when subjected to a force that causes the buffer layer to deform, that is, the buffer layer has a high tensile strength and will not easily break or break. Even when the battery is undergoing a puncture test (the needle will stretch the battery significantly during the puncture test), the needle will not tear the partition, which is beneficial to improving the battery's anti-puncture ability, ensuring that the partition always separates adjacent battery cells and preventing short circuits inside the battery.

[0022] In this utility model, the separator in the battery is improved. The first adhesive layer, buffer layer, and second adhesive layer are stacked in sequence to form a "sandwich" structure. This structure ensures that the separator has both adhesive properties and strength and toughness, thereby improving the battery's impact resistance and needle puncture resistance, and enhancing the battery's safety performance.

[0023] Electronic devices using the above-mentioned battery can ensure the safety performance during operation and are also beneficial to improving the endurance of the electronic devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the overall structure of a battery provided in one embodiment of the present utility model;

[0026] Figure 2 A schematic structural diagram of a battery separator provided in one embodiment of the present utility model;

[0027] Figure 3 A schematic diagram of parameters of a separator in a battery provided by an embodiment of the present utility model;

[0028] Figure 4 A schematic diagram of the relative position relationship between the battery cells and the separators in a battery provided in one embodiment of the present invention.

[0029] Description of Figure Numbers:

[0030] 100, battery cell;

[0031] 110, first battery cell; 120, second battery cell;

[0032] 200, interlayer;

[0033] 210, buffer layer; 220, first adhesive layer; 230, second adhesive layer; 240, first thermal insulation layer; 250, second thermal insulation layer;

[0034] 300. Aluminum-plastic film.

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or", "and / or" or "and / or" appear in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] With higher demands on battery capacity and endurance, internal series batteries are becoming increasingly widely used. Internal series batteries are battery packs composed of two or more stacked cells, and adjacent cells need to be separated by a partition to prevent direct contact between the two adjacent cells, which could cause an internal short circuit in the internal series battery. Since internal series batteries need to undergo needle puncture safety testing before leaving the factory, and internal series batteries may encounter unexpected situations such as drops and impacts during transportation, storage, and use, in order to improve the needle puncture resistance and impact resistance of internal series batteries, it is necessary to improve the partition between adjacent cells to ensure the safety performance of internal series batteries.

[0040] Based on this, in order to improve the battery's anti-puncture ability and anti-collision performance, and improve the battery's safety performance, refer to Figures 1 to 4 One embodiment of the present invention provides a battery comprising a plurality of battery cells 100 and a separator 200. The plurality of battery cells 100 are stacked relative to each other, and the separator 200 is disposed between two adjacent battery cells 100. The separator 200 comprises a first adhesive layer 220, a second adhesive layer 230, and a buffer layer 210. The first adhesive layer 220 and the second adhesive layer 230 are disposed on opposite sides of the buffer layer 210, and the first adhesive layer 220 and the second adhesive layer 230 are respectively connected to the battery cells 100. The buffer layer 210 has a higher toughness than the first adhesive layer 220 and the second adhesive layer 230.

[0041] Specifically, in this embodiment, the battery includes a plurality of battery cells 100 arranged in a relatively stacked manner, and the plurality of battery cells 100 are connected in series or in parallel to form an internal series battery. A partition 200 is provided between two adjacent battery cells 100, and the partition 200 completely separates the two adjacent battery cells 100 so that the two adjacent battery cells 100 do not directly contact each other, thereby ensuring that the battery does not have an internal short circuit and improving the safety of the battery. A first adhesive layer 220 and a second adhesive layer 230 are provided in the partition 200. The first adhesive layer 220 and the second adhesive layer 230 stably adhere the battery cell 100 to the partition 200. Even if the battery is dropped, collided or other sudden situations occur, the battery cell 100 inside the battery will not shake, which is beneficial to improving the anti-collision performance of the battery and ensuring the stability of the internal structure of the battery. The buffer layer 210 provided in the interlayer 200 has a toughness that is higher than that of the first adhesive layer 220 and the second adhesive layer 230. Toughness here refers to the buffer layer 210's resistance to breaking when subjected to a force that causes deformation. In other words, the buffer layer 210 has a high tensile strength and does not easily break or fracture. Even when the battery is subjected to a needle penetration test (during which the needle will significantly stretch the battery), the needle will not tear the interlayer 200, thereby improving the battery's resistance to needle penetration and ensuring that the interlayer 200 always separates adjacent battery cells 100, preventing short circuits within the battery.

[0042] In this embodiment, the separator 200 in the battery is improved. The first adhesive layer 220, the buffer layer 210, and the second adhesive layer 230 in the separator 200 are stacked in sequence to form a "sandwich" structure. This structure allows the separator 200 to achieve both adhesive properties and strength and toughness, thereby improving the battery's impact resistance and needle puncture resistance, and enhancing the battery's safety performance.

[0043] Further, in some embodiments, referring to Figure 1Taking a battery including two battery cells 100 as an example, that is, the battery includes a first battery cell 110 and a second battery cell 120, the first battery cell 110 and the second battery cell 120 are relatively stacked, and a partition 200 is provided between the first battery cell 110 and the second battery cell 120. The first adhesive layer 220 in the partition 200 is bonded to the first battery cell 110, and the second adhesive layer 230 in the partition 200 is bonded to the second battery cell 120. The first adhesive layer 220 is conducive to improving the bonding stability between the first battery cell 110 and the partition 200, and the second adhesive layer 230 is conducive to improving the bonding stability between the second battery cell 120 and the partition 200. The buffer layer 210 in the partition 200 completely separates the first battery cell 110 and the second battery cell 120, preventing the first battery cell 110 and the second battery cell 120 from directly contacting each other and causing a short circuit in the battery. The buffer layer 210 has high strength and toughness, so that the buffer layer 210 has good tensile strength and damage resistance, thereby ensuring the separation effect between the first battery cell 110 and the second battery cell 120.

[0044] Furthermore, an aluminum-plastic film 300 is provided on the side of the first battery cell 110 facing away from the first adhesive layer 220, and an aluminum-plastic film 300 is provided on the side of the second battery cell 120 facing away from the second adhesive layer 230. The aluminum-plastic film 300 is bonded to the first battery cell 110 and the second battery cell 120 by hot pressing, so that a first cavity is formed at the first battery cell 110 and a second cavity is formed at the second battery cell 120. Electrolyte is injected into the first cavity and the second cavity respectively, and vacuum packaging is performed to obtain a complete inner series battery.

[0045] In some embodiments, reference Figure 4 , along the direction perpendicular to the direction from the battery cell 100 to the partition 200, the edge of the partition 200 exceeds the edge of the battery cell 100. In other words, along the direction from the battery cell 100 to the partition 200, the projected area of ​​the partition 200 covers the projected area of ​​the battery cell 100.

[0046] Specifically, in this embodiment, the length and width of the partition 200 are both greater than the length and width of the battery cell 100, that is, the partition 200 completely separates two adjacent battery cells 100, so that the two adjacent battery cells 100 will not directly contact each other, thereby effectively preventing a short circuit in the battery caused by direct contact between the two adjacent battery cells 100.

[0047] In some embodiments, reference Figure 2 A first thermal insulation layer 240 is provided between the first adhesive layer 220 and the buffer layer 210 , and a second thermal insulation layer 250 is provided between the second adhesive layer 230 and the buffer layer 210 .

[0048] Specifically, in this embodiment, since the battery cell 100 generates heat during operation, higher heat will affect the operating performance of the battery cell 100 and shorten the service life of the battery cell 100. Since the battery in this embodiment includes multiple battery cells 100, in order to avoid heat accumulation in the multiple battery cells 100 in the battery, a first thermal insulation layer 240 is provided between the first adhesive layer 220 and the buffer layer 210. The first thermal insulation layer 240 can isolate the heat generated by the battery cell 100 connected to the first adhesive layer 220 during operation and prevent the heat generated by the battery cell 100 connected to the first adhesive layer 220 from diffusing toward the buffer layer 210. Similarly, a second thermal insulation layer 250 is provided between the second adhesive layer 230 and the buffer layer 210. The second thermal insulation layer 250 can isolate the heat generated by the battery cell 100 connected to the second adhesive layer 230 during operation and prevent the heat generated by the battery cell 100 connected to the second adhesive layer 230 from diffusing toward the buffer layer 210.

[0049] By arranging the first thermal insulation layer 240 and the second thermal insulation layer 250 in the partition 200, it is possible to effectively prevent the heat generated by the battery cell 100 in the working state from diffusing and accumulating inside the battery, thereby preventing the temperature inside the battery from rising sharply, ensuring that the battery has a stable working state, and extending the battery life.

[0050] In some embodiments, the first thermal insulation layer 240 is an aluminum layer, and the second thermal insulation layer 250 is an aluminum layer.

[0051] Specifically, in this embodiment, both the first thermal insulation layer 240 and the second thermal insulation layer 250 are aluminum layers. On the one hand, the aluminum layers reflect heat, reducing its impact on the battery, while also shielding electromagnetic waves, protecting the battery from external electromagnetic interference. On the other hand, the aluminum layers prevent direct contact between the electrolyte and the aluminum-plastic film 300, preventing electrochemical corrosion. Furthermore, the aluminum layers provide excellent mechanical strength, protecting the battery from damage when subjected to external forces.

[0052] In addition, the aluminum layer has low density, good plasticity, and good heat insulation effect, which is beneficial to improving the weight energy density of the battery, and at the same time helps to reduce the adverse effects of temperature changes in the battery cells 100 inside the battery and changes in the temperature of the external environment of the battery on the battery.

[0053] In some embodiments, the thickness of the partition 200 is D, the thickness of the battery cell 100 arranged on one side of the partition 200 is H1, and the thickness of the battery cell 100 arranged on the other side of the partition 200 is H2, and D, H1 and H2 satisfy: (1-99.5%)H1≤D≤(1-97%)H1, 0≤|H1-H2|≤1.

[0054] In some embodiments, reference Figure 3The thickness D1 of the first thermal insulation layer 240 satisfies the following conditions: 30 μm ≤ D1 ≤ 50 μm; the thickness D2 of the second thermal insulation layer 250 satisfies the following conditions: 30 μm ≤ D2 ≤ 50 μm. For example, the values ​​of D1 can be 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, and so on; the values ​​of D2 can be 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, and so on. Furthermore, the relationship between D1 and D2 satisfies the following conditions: 0 ≤ |D1 - D2| ≤ 1.

[0055] Specifically, in this embodiment, the thickness of the first thermal insulation layer 240 and the second thermal insulation layer 250 is set within the above-mentioned numerical range. On the one hand, the thickness of the first thermal insulation layer 240 or the second thermal insulation layer 250 is prevented from being too thin (for example, the thickness of the first thermal insulation layer 240 or the second thermal insulation layer 250 is set to 10 μm, 15 μm, 20 μm, etc.), which would reduce the thermal insulation performance of the first thermal insulation layer 240 or the second thermal insulation layer 250 and make the first thermal insulation layer 240 or the second thermal insulation layer 250 unable to provide a good thermal insulation effect. On the other hand, the thickness of the first thermal insulation layer 240 or the second thermal insulation layer 250 is prevented from being too thick (for example, the thickness of the first thermal insulation layer 240 or the second thermal insulation layer 250 is set to 60 μm, 70 μm, 80 μm, etc.), which would increase the overall thickness of the battery and reduce the overall energy density of the battery.

[0056] In some embodiments, reference Figure 3 , the tensile coefficient M of the buffer layer 210 satisfies: M≥1.1; the conductivity σ of the buffer layer 210 satisfies: σ<10 -7 s / cm; the thickness D3 of the buffer layer 210 satisfies: 50um≤D3≤100um. For example, the value of M can be 1.1, 1.5, 2, etc.; the value of σ can be 10 -8 , 10 -9 , 10 -10 And so on; the value of D3 can be 50um, 75um, 100um, etc.

[0057] Specifically, in this embodiment, the greater the tensile modulus of the buffer layer 210, the less likely the buffer layer 210 is to be torn, which is more conducive to improving the battery's anti-puncture capability. The lower the electrical conductivity of the buffer layer 210, the more conducive it is to improving the insulation performance of the buffer layer 210 and preventing short circuits within the battery. Setting the thickness of the buffer layer 210 within the above-mentioned numerical range can, on the one hand, avoid the buffer layer 210 being too thin (for example, the thickness of the buffer layer 210 is set to 25um, 30um, 35um, etc.), which would reduce the strength and toughness of the buffer layer 210 and make it unable to effectively insulate two adjacent battery cells 100; on the other hand, it can avoid the buffer layer 210 being too thick (for example, the thickness of the buffer layer 210 is set to 150um, 180um, 200um, etc.), which would increase the overall thickness of the battery and reduce the overall energy density of the battery.

[0058] In some embodiments, an aluminum-plastic film 300 is disposed on the side of the battery cell 100 facing away from the barrier layer 200. The width of each of the battery cells 100 is the same, W1. The width of the barrier layer 200 is W2. The width of the aluminum-plastic film 300 is W3. W1, W2, and W3 satisfy the following relationship: (1+8%)W1≤W2≤(1-10%)W3. Specifically, 20 μm≤W1≤60 μm, 30 μm≤W2≤80 μm, and 40 μm≤W3≤100 μm.

[0059] In some embodiments, reference Figure 3 The first adhesive layer 220 is a hot melt adhesive layer, and the second adhesive layer 230 is a hot melt adhesive layer. The melting temperature T1 of the first adhesive layer 220 satisfies the following conditions: 65°C ≤ T1 ≤ 135°C, and the thickness D4 of the first adhesive layer 220 satisfies the following conditions: 10 μm ≤ D4 ≤ 50 μm. The melting temperature T2 of the second adhesive layer 230 satisfies the following conditions: 65°C ≤ T2 ≤ 135°C, and the thickness D5 of the second adhesive layer 230 satisfies the following conditions: 10 μm ≤ D5 ≤ 50 μm. For example, T1 can be set to 65°C, 80°C, 100°C, 120°C, 135°C, etc.; T2 can be set to 65°C, 80°C, 100°C, 120°C, 135°C, etc.; D4 can be set to 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, etc.; D5 can be set to 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, etc. Furthermore, T1 and T2 satisfy the following relationship: 0 ≤ |T1-T2| ≤ 1; and D4 and D5 satisfy the following relationship: 0 ≤ |D4-D5| ≤ 1.

[0060] Specifically, in this embodiment, the battery cell 100 and the first adhesive layer 220 can be firmly bonded together by hot pressing, and the battery cell 100 and the second adhesive layer 230 can be firmly bonded together by hot pressing to prevent the battery cell 100 from shaking inside the battery, thereby ensuring the internal structural stability of the battery.

[0061] Furthermore, by setting the melting temperatures of the first adhesive layer 220 and the second adhesive layer 230 within the above-mentioned numerical range, on the one hand, it is possible to avoid the melting temperature of the first adhesive layer 220 or the second adhesive layer 230 being too low (for example, the melting temperature of the first adhesive layer 220 or the second adhesive layer 230 is set to 20°C, 30°C, 45°C, etc.), which causes the first adhesive layer 220 or the second adhesive layer 230 to melt at room temperature or at a lower temperature, making the first adhesive layer 220 or the second adhesive layer 230 prone to failure. On the other hand, it can prevent the melting temperature of the first adhesive layer 220 or the second adhesive layer 230 from being too high (for example, the melting temperature of the first adhesive layer 220 or the second adhesive layer 230 is set to 150°C, 180°C, 200°C, etc.), which makes it difficult for the first adhesive layer 220 or the second adhesive layer 230 to melt, resulting in a poor adhesion of the first adhesive layer 220 or the second adhesive layer 230 to the battery cell 100, which in turn easily causes the battery cell 100 to shake or even fall off when impacted or dropped, ultimately creating a safety hazard. In addition, if the melting temperature of the first adhesive layer 220 or the second adhesive layer 230 is set too high, it will place higher requirements on the hot pressing equipment, which is not conducive to saving production costs.

[0062] Furthermore, by setting the thickness of the first adhesive layer 220 and the second adhesive layer 230 within the above-mentioned numerical range, on the one hand, it is possible to avoid the first adhesive layer 220 or the second adhesive layer 230 being too thin (for example, the thickness of the first adhesive layer 220 or the second adhesive layer 230 is set to 1um, 3um, 5um, etc.), which would result in the first adhesive layer 220 or the second adhesive layer 230 being unable to effectively and stably bond the battery cell 100, causing the battery cell 100 to shake or even fall off easily due to weak bonding after being hit or dropped. On the other hand, it is possible to avoid the first adhesive layer 220 or the second adhesive layer 230 being too thick (for example, the thickness of the first adhesive layer 220 or the second adhesive layer 230 is set to 60um, 80um, 100um, etc.), which would increase the overall thickness of the battery and reduce the overall energy density of the battery.

[0063] In some embodiments, the buffer layer 210 is one of a polypropylene structure, a polyethylene structure, a polyurethane structure, a poly(p-phenylene terephthalamide) structure, a poly(vinylidene fluoride) structure, a polystyrene structure, a poly(perfluoroethylene) structure, a poly(methyl methacrylate) structure, a polyacrylonitrile structure, a polystyrene-co-butyl acrylate structure, a polyimide structure, and a polyacrylate structure.

[0064] It should be noted that the buffer layer 210 may also be made of other materials with good strength, toughness and high stability.

[0065] In some embodiments, the porosity of the buffer layer 210 is Satisfied: 50% ≤ ≤80%. For example, The value of can be 50%, 60%, 70%, 75%, 80%, etc. In other words, the buffer layer 210 is a porous structure.

[0066] Specifically, in this embodiment, the buffer layer 210 adopts a porous structure design, which can reduce the density of the buffer layer 210, improve the lightweight capability of the buffer layer 210, and save the manufacturing cost of the buffer layer 210. At the same time, due to the presence of pores (pores are prone to negative pressure), the buffer layer 210 can have a good adsorption capacity for the first thermal insulation layer 240 and the second thermal insulation layer 250, thereby enhancing the structural stability of the internal battery.

[0067] Referring to Table 1, several groups of examples and comparative examples are used for experiments:

[0068] Example 1

[0069] Two soft-pack bare cells are used as the first cell 110 and the second cell 120. The two cells 100 are separated and bonded together using the separator 200 mentioned in this embodiment. The outermost layer is wrapped with a conventional aluminum-plastic film 300. After packaging and liquid injection, an inner series battery is obtained. The separator 200 is composed of a buffer layer 210, a first adhesive layer 220, a second adhesive layer 230, a first thermal insulation layer 240, and a second thermal insulation layer 250. The thickness of the separator 200 is D = (1-98%) H1, the width of the cell 100 is W1 = 50 μm, the width of the aluminum-plastic film 300 is W3 = 60 μm, and the width of the separator 200 is W2 = (1+8%) W1 = (1-10%) W3 = 54 μm.

[0070] Example 2

[0071] The difference from Example 1 is that in this embodiment, the thickness of the partition 200 D = (1-97%) H1, the width of the battery cell 100 W1 = 20um, the width of the aluminum-plastic film 300 W3 = 24um, and the width of the partition 200 W2 = (1+8%) W1 = (1-10%) W3 = 21.6um.

[0072] Comparative Example 1

[0073] The differences from Example 1 are: thickness D of the partition 200 = (1-99.8%) H1, width W1 of the battery cell 100 = 50 um, width W3 of the aluminum-plastic film 300 = 60.2 um, and width W2 of the partition 200 = (1+6%) W1 = (1-12%) W3 = 53 um.

[0074] Comparative Example 2

[0075] The differences from Example 1 are: thickness D of the partition 200 = (1-92%) H1, width W1 of the battery cell 100 = 50 um, width W3 of the aluminum-plastic film 300 = 56.5 um, and width W2 of the partition 200 = (1+4%) W1 = (1-15%) W3 = 48 um.

[0076] Comparative Example 3

[0077] The differences from Example 1 are: thickness D of the partition 200 = (1-90%) H1, width W1 of the battery cell 100 = 50 um, width W3 of the aluminum-plastic film 300 = 61.4 um, and width W2 of the partition 200 = (1+2%) W1 = (1-17%) W3 = 51 um.

[0078] Comparative Example 4

[0079] The difference from Example 1 is that the partition 200 in this embodiment is replaced by a conventional aluminum-plastic film 300. The width of the battery cell 100 W1 = 50 μm, the width of the aluminum-plastic film 300 W3 = 60 μm, and the width of the partition 200 W2 = (1 + 8%) W1 = (1 - 10%) W3 = 54 μm.

[0080] Ten internally connected batteries in series were prepared for the above-mentioned embodiment and comparative example, and needle penetration test and drop test were carried out to monitor the short circuit situation and internal deformation degree of the battery, as well as whether there was fire or explosion.

[0081]

[0082] Table 1

[0083] It can be seen from the above comparative examples and embodiments that when the partition 200 with a thickness satisfying (1-99.5%) H1≤D≤(1-97%) H1 and a width satisfying (1+8%) W1≤W2≤(1-10%) W3 is used, the anti-puncture effect of the inner-series battery is the best, the battery does not deform or explode after falling, and the weight energy density is at an upper-middle level, which greatly improves the safety performance of the battery, and the porous design in the partition 200 can effectively improve the lightweight capability and endurance of the battery.

[0084] If the thickness D of the interlayer 200 is too small, it will affect the needle puncture resistance, making it easy for needles to pierce the interlayer, causing a short circuit in the battery. If the thickness D of the interlayer 200 is too large, it will not only reduce the gravimetric energy density, but also increase production costs. If the width W1 of the interlayer 200 is too small, it will affect the battery cell packaging, causing leakage, fire and explosion risks if dropped. If the width W1 of the interlayer 200 is too large, it will cause a loss of gravimetric energy density.

[0085] Correspondingly, another embodiment of the present invention further provides an electronic device, which includes the battery in any of the above embodiments. For example, the electronic device can be a new energy vehicle, etc.

[0086] Specifically, in this embodiment, the electronic device using the above-mentioned battery can ensure the safety performance during operation and is also conducive to improving the endurance of the electronic device.

[0087] Thanks to the improvement of the above-mentioned battery, the electronic device of this embodiment has the same technical effects as the above-mentioned battery, which will not be described in detail here.

[0088] It should be noted that other contents of the battery and electronic device disclosed in the present utility model can be found in the prior art and will not be described in detail here.

[0089] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery, characterized in that include: A plurality of battery cells, wherein the plurality of battery cells are stacked relative to each other; A partition layer is provided between two adjacent battery cells, the partition layer comprising a first adhesive layer, a second adhesive layer and a buffer layer, the first adhesive layer and the second adhesive layer are respectively provided on opposite sides of the buffer layer, and the first adhesive layer and the second adhesive layer are respectively connected to the battery cells; The toughness of the buffer layer is higher than that of the first adhesive layer and the second adhesive layer.

2. The battery according to claim 1, characterized in that Along a direction perpendicular to the direction from the battery cell to the partition, an edge of the partition exceeds an edge of the battery cell.

3. The battery according to claim 1, characterized in that A first heat insulation layer is provided between the first adhesive layer and the buffer layer, and a second heat insulation layer is provided between the second adhesive layer and the buffer layer.

4. The battery according to claim 1, characterized in that The thickness of the partition is D, the thickness of the battery cell arranged on one side of the partition is H1, and the thickness of the battery cell arranged on the other side of the partition is H2. D, H1 and H2 satisfy the following: (1-99.5%) H1≤D≤(1-97%) H1, 0≤|H1-H2|≤1.

5. The battery according to claim 3, characterized in that The thickness of the first heat insulation layer is D1, the thickness of the second heat insulation layer is D2, and D1 and D2 satisfy: 0≤|D1-D2|≤1.

6. The battery according to claim 1, characterized in that An aluminum-plastic film is provided on one side of the battery cell away from the partition, the width of the plurality of battery cells is the same and is W1, the width of the partition is W2, the width of the aluminum-plastic film is W3, and W1, W2, and W3 satisfy the following relationship: (1+8%)W1≤W2≤(1-10%)W3; Among them, 20um≤W1≤60um, 30um≤W2≤80um, 40um≤W3≤100um.

7. The battery according to claim 1, characterized in that The first adhesive layer is a hot melt adhesive layer, and the second adhesive layer is a hot melt adhesive layer; The melting temperature of the first adhesive layer is T1, the melting temperature of the second adhesive layer is T2, and T1 and T2 satisfy the following relationship: 0≤|T1-T2|≤1; The thickness of the first adhesive layer is D4, the thickness of the second adhesive layer is D5, and D4 and D5 satisfy the following relationship: 0≤|D4-D5|≤1.

8. The battery according to claim 1, characterized in that The buffer layer is one of a polypropylene structure, a polyethylene structure, a polyurethane structure, a poly(p-phenylene terephthalamide) structure, a polyvinylidene fluoride structure, a polystyrene structure, a poly(perfluoroethylene) structure, a polymethyl methacrylate structure, a polyacrylonitrile structure, a polystyrene-co-butyl acrylate structure, a polyimide structure and a polyacrylate structure.

9. The battery according to claim 1, characterized in that The porosity φ of the buffer layer satisfies: 50%≤φ≤80%.

10. An electronic device, characterized in that A battery comprising the battery according to any one of claims 1 to 9.

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