Battery, power utilization device, method and apparatus for manufacturing a battery

Abstract

The present application provides a battery, an electric power utilization device, and a method and apparatus for manufacturing the battery. The battery includes a battery cell and a first member, and a first surface of the first member and at least one of the battery cells are connected by an adhesive member including a first adhesive structure and a second adhesive structure, the first adhesive structure being positioned around the periphery of the second adhesive structure, and the first adhesive structure having a breaking elongation rate greater than the breaking elongation rate of the second adhesive structure. The battery, the electric power utilization device, and the method and apparatus for manufacturing the battery according to the present application can improve the safety of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly, to batteries, power utilization devices, methods and apparatuses for manufacturing batteries.

Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. In this context, electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental friendliness. For electric vehicles, battery technology is also an important factor related to their development.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In the development of battery technology, in addition to improving the performance of the battery, safety is also an issue that cannot be ignored. If the safety of the battery cannot be guaranteed, the battery cannot be used. Therefore, how to strengthen the safety of the battery is an urgent technical problem to be solved in battery technology.

Means for Solving the Problems

[0004] This application provides a battery, a power utilization device, a method and an apparatus for manufacturing a battery, which can improve the safety of the battery.

[0005] According to a first aspect, a battery includes a battery cell and a first member, wherein a first surface of the first member and at least one of the battery cells are connected by an adhesive member including a first adhesive structure and a second adhesive structure, the first adhesive structure is located around the second adhesive structure, and the elongation at break of the first adhesive structure is greater than the elongation at break of the second adhesive structure.

[0006] Therefore, for the battery according to the embodiment of the present application, an adhesive member including two types of adhesive structures is installed between the battery cell and the first member to fix the battery cell. The first member can include the housing of the battery or the upper cover inside the housing such that the first adhesive structure with a large elongation at break is located around the second adhesive structure with a small elongation at break. In this way, after the battery cell expands and deforms, the edge position is the first adhesive structure with a high elongation at break, which maintains the connection and fixation between the battery cell and the upper cover or between the battery cell and the housing, improving the stability of the battery cell in the battery and further improving the safety of the battery.

[0007] In some embodiments, the elongation at break A1 of the first adhesive structure satisfies 100% ≤ A1 ≤ 500%, and / or the elongation at break B1 of the second adhesive structure satisfies 10% ≤ B1 ≤ 150%.

[0008] In some embodiments, the elongation at break A1 of the first adhesive structure satisfies 150% ≤ B1 ≤ 400%, and / or the elongation at break B1 of the second adhesive structure satisfies 60% ≤ B1 ≤ 120%.

[0009] By reasonably setting the elongation at break of the first adhesive structure and the second adhesive structure, after the battery cell expands and deforms, the first adhesive structure with a high elongation at break can maintain the connection and fixation between the battery cell and the upper cover or between the battery cell and the housing.

[0010] In some embodiments, the adhesive member is used to bond the second surface and the first surface of at least one of the battery cells, and the second adhesive structure covers the center point of the second surface.

[0011] When the battery cell expands, the amount of deformation at the center position of the battery cell is large, and the amount of deformation in the edge region is relatively small. That is, the distance by which the center position of the battery cell moves away from the first surface is smaller than the distance by which the edge region moves away from the first surface. Therefore, by providing the second adhesive structure with a small elongation at break and high strength at the center position, the center point of the surface of the battery cell where it is located can be covered, and the stability between the battery cell and the first member can be ensured.

[0012] In some embodiments, the first adhesive structure surrounds the outer periphery of the second adhesive structure.

[0013] When the battery cell expands, the amount of deformation at the center position of the battery cell is large, and the amount of deformation at the edge position of the battery cell is small. That is, the distance by which the edge region of the battery cell moves away from the first surface is larger than the distance by which the center position moves away from the first surface. Therefore, by providing the first adhesive structure with a large elongation at break around the second adhesive structure, the risk that the adhesive tears in the edge region around the battery cell after the battery cell expands and deforms can be reduced.

[0014] In some embodiments, the adhesive member is used to bond the second surface and the first surface of at least one of the battery cells. The area of the second surface is S0, the area of the first adhesive structure in contact with the second surface is S1, and the area of the second adhesive structure in contact with the second surface is S2. S0, S1, and S2 satisfy 0.25 ≦ (S1 + S2) / S0 < 1.

[0015] When the area where the connecting member contacts the first surface or the area where the battery cell contacts the second surface is small, the binding force of the adhesive structure on the battery cell is weak, there is a risk of failure due to vibration and shock, and the capacity retention rate of the battery cell deteriorates. When the area where the adhesive member contacts the first surface or the area where the battery cell contacts the second surface is too large, it will also cause the adhesive to ooze out and adhere to structural components such as the electrode terminals of the battery cell or the battery wire harness. Furthermore, it will cause vibration and shock, and there is a risk of failure. Therefore, when 0.25 ≦ (S1 + S2) / S0 < 1, it can not only ensure that the battery does not fail even under vibration, but also ensure that the battery is in a good interval of capacity retention rate.

[0016] In some embodiments, S0, S1, and S2 satisfy 0.5 ≦ (S1 + S2)) / S0 ≦ 0.85.

[0017] Therefore, when 0.5 ≦ (S1 + S2) / S0 ≦ 0.85, the Vibration resistance dynamic shock and capacity retention rate of the battery are better.

[0018] In some embodiments, the area where the first adhesive structure contacts the first surface is S1, the area where the second adhesive structure contacts the first surface is S2, and S1 and S2 satisfy 0.05 ≦ S1 / (S1 + S2) ≦ 0.85.

[0019] In some embodiments, S1 and S2 satisfy 0.15 ≦ S1 / (S1 + S2) ≦ 0.55.

[0020] By setting the proportional relationship of the areas of the first adhesive structure and the second adhesive structure as described above, while ensuring the structural strength, the amount of adhesive used can be reduced as much as possible.

[0021] The ratio of the adhesive application area in the first bonding structure at the edge position affects the structural strength. By increasing the content of the first bonding structure within a certain range, it contributes to the improvement of the structural strength and the capacity retention rate of the battery. When S1 / (S1 + S2) is equal to 1, that is, when only the first bonding structure is used, the binding strength of the bonding structure to the battery structure becomes weak. When S1 / (S1 + S2) is equal to 0.02, it has been shown that when most of the bonding structures are the second bonding structures, the problem of the adhesive tearing occurs. When 0.05 ≤ S1 / (S1 + S2) ≤ 0.85, it can not only ensure that the battery does not fail even under vibration, but also ensure that the capacity retention rate of the battery is in a good range. Especially when 0.15 ≤ S1 / (S1 + S2) ≤ 0.55, the vibration and shock resistance performance of the battery becomes better.

[0022] In some embodiments, the elastic modulus of the first bonding structure is smaller than the elastic modulus of the second bonding structure. Since the elongation at break of a bonding structure such as an adhesive usually has a negative correlation with the elastic modulus, if the elastic modulus of the first bonding structure is set to be smaller than the elastic modulus of the second bonding structure, it can be ensured that the elongation at break of the first bonding structure is larger than the elongation at break of the second bonding structure, and the risk of the adhesive tearing at the edge of the battery cell can also be reduced.

[0023] In some embodiments, the elastic modulus A2 of the first bonding structure satisfies 10 MPa ≤ A2 ≤ 150 MPa, and / or the elastic modulus B2 of the second bonding structure satisfies 150 MPa ≤ B2 ≤ 1000 MPa.

[0024] In some embodiments, the elastic modulus A2 of the first bonding structure satisfies 30 MPa ≤ A2 ≤ 60 MPa, and / or the elastic modulus B2 of the second bonding structure satisfies 150 MPa ≤ B2 ≤ 500 MPa.

[0025] In some embodiments, the strength of the first adhesive structure is smaller than that of the second adhesive structure. Since the strength of an adhesive structure such as an adhesive is usually in a positive correlation with the elastic modulus and the elongation at break is in a negative correlation with the elastic modulus, when the strength of the second adhesive structure is high, the stability of the battery cell can be ensured. When the strength of the first adhesive structure is high and the elongation at break is high, the risk of the adhesive tearing at the edge of the battery cell can be reduced.

[0026] In some embodiments, the strength A3 of the first adhesive structure satisfies 2 MPa ≤ A3 ≤ 15 MPa, and / or

[0027] the strength B3 of the second adhesive structure satisfies 6 MPa ≤ B3 ≤ 25 MPa.

[0028] In some embodiments, the strength A3 of the first adhesive structure satisfies 6 MPa ≤ A3 ≤ 15 MPa, and / or the strength B3 of the second adhesive structure satisfies 8 MPa ≤ B3 ≤ 25 MPa.

[0029] In some embodiments, the battery includes a plurality of battery cell packs arranged in a first direction perpendicular to the first surface. Each battery cell pack among the plurality of battery cell packs includes at least two battery cells arranged in a second direction perpendicular to the first direction. The adhesive member is provided between the first battery cell pack among the plurality of battery cell packs and the first surface.

[0030] In some embodiments, a plurality of the adhesive members are provided between the first battery cell pack and the first surface, and the plurality of adhesive members and the battery cells in the first battery cell pack correspond one-to-one. In this way, when the battery cells expand and deform, the stability of each battery cell can be better ensured.

[0031] In some embodiments, for the purpose of simplifying the processing process, one of the adhesive members is provided between the first battery cell pack and the first surface.

[0032] In some embodiments, a gap is provided between the first adhesive structure and the second adhesive structure.

[0033] In the above configuration, when the first adhesive structure and the second adhesive structure select materials with different characteristics in the same system, they may affect each other. For example, when the materials of the first adhesive structure and the second adhesive structure select adhesives with different characteristics in the same polyurethane system, they may react and affect each other. By providing a gap between the first adhesive structure 51 and the second adhesive structure 52, the mutual influence between the first adhesive structure 51 and the second adhesive structure 52 can be reduced.

[0034] In some embodiments, a blocking member is provided between the first adhesive structure and the second adhesive structure.

[0035] By installing the blocking member, the mutual influence between the first adhesive structure and the second adhesive structure can be better avoided.

[0036] In some embodiments, the material of the first adhesive structure includes at least one of epoxy resin, polyurethane, acrylic resin, and organosilicon rubber, and / or the material of the second adhesive structure includes at least one of epoxy resin, polyurethane, and acrylic resin.

[0037] In some embodiments, the battery includes a first housing and a second housing, the first housing and the second housing are engaged to form a receiving space for receiving the battery cells, and the first member includes the first housing and / or the second housing.

[0038] In some embodiments, the battery includes an upper cover, a first housing, and a second housing, the first housing and the second housing are engaged to form a receiving space for receiving the battery cells, the upper cover is provided in the receiving space to cover the battery cells, and the first member includes the upper cover.

[0039] In some embodiments, the largest surface area of the first housing and / or the second housing is the first surface.

[0040] By arranging in the above manner, the bonding area between the first member and the battery cell can be increased, and the bonding strength between the two can be improved.

[0041] In some embodiments, the battery cell includes an electrode assembly, a case having an opening and a cavity for accommodating the electrode assembly, and a cover plate for covering the opening of the case.

[0042] In some embodiments, the bonding member is provided between the largest side wall of the case and the first surface.

[0043] According to the above arrangement, the bonding area between the bonding member and the battery cell can be increased, and the bonding strength between the two can be improved.

[0044] According to a second aspect, there is provided a power utilization device including the battery in the first aspect for providing electrical energy.

[0045] In some embodiments, the power utilization device is a vehicle, a ship or a spacecraft.

[0046] According to a third aspect, there is provided a method of manufacturing a battery including providing a battery cell and providing a first member, wherein a first surface of the first member and at least one of the battery cells are connected by a bonding member including a first bonding structure and a second bonding structure, the first bonding structure is located around the second bonding structure, and a breaking elongation rate of the first bonding structure is greater than a breaking elongation rate of the second bonding structure.

[0047] According to a fourth aspect, there is provided an apparatus for manufacturing a battery including a module for executing the method of the third aspect.

Brief Description of the Drawings

[0048]

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[0049] In the drawings, the drawings are not drawn according to actual proportions.

Embodiments for Carrying Out the Invention

[0050] Hereinafter, embodiments of the present application will be described in more detail based on the drawings and examples. The following detailed description of the examples and the drawings are for exemplarily explaining the principle of the present application, but cannot be used to limit the scope of the present application. That is, the present application is not limited to the described embodiments.

[0051] In the description of the present application, unless otherwise specified, "a plurality" means two or more. The orientation or positional relationship indicated by "upper", "lower", "left", "right", "inner", "outer", etc. is only for easily explaining the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation and be configured or operated in a specific orientation. Therefore, it should not be understood as limiting the present application. In addition, terms such as "first", "second", "third", etc. are only for explaining the purpose and should not be understood as indicating or implying relative importance. "Vertical" is not vertical in the strict sense and is within the allowable error range. "Parallel" is not parallel in the strict sense and is within the allowable error range.

[0052] All the orientation terms used in the following description are in the directions shown in the drawings and do not limit the specific structure of the present application. In the description of the present application, unless otherwise clearly specified or limited, the terms "mounting", "connecting", and "attaching" should be understood broadly. For example, they may be connected so as to be fixed, detachably connected, or integrally connected. They may be directly connected or indirectly connected through an intermediate member. A person skilled in the art can understand the specific meaning of the above terms in the present application according to the specific situation.

[0053] In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the embodiments of the present application are not limited thereto. The battery cell may be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiments of the present application are not limited thereto. Generally, according to the packaging method, the battery cell is divided into three types: a cylindrical battery cell, a square battery cell, and a pouch battery cell, and the embodiments of the present application are not limited thereto.

[0054] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack, etc. A battery pack generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquid or other foreign substances from affecting the charging or discharging of the battery cells.

[0055] The battery cell includes an electrode assembly composed of a positive electrode plate, a negative electrode plate, and a separator, and an electrolyte. The battery cell mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer, and the current collector not coated with the positive electrode active material layer is used as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the current collector not coated with the negative electrode active material layer is used as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. To ensure passing a large current without fusing, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together. The material of the separator may be PP or PE, etc. Also, the electrode assembly may have a winding structure or a stacked structure, and the embodiments of the present application are not limited thereto.

[0056] Also, to improve the safety performance of the battery cell, generally, the battery cell is further provided with a pressure relief mechanism. The pressure relief mechanism refers to an element or member that operates to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold value. The predetermined threshold value can be adjusted according to the design requirements. The threshold value can depend on one or more materials of the positive electrode plate, negative electrode plate, electrolyte, and separator in the battery cell. The pressure relief mechanism can use, for example, a pressure-sensitive or temperature-sensitive element or member. That is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold value, the pressure relief mechanism operates to form a passage through which the internal pressure or temperature can be released.

[0057] In the development of battery technology, for example, many design elements need to be considered simultaneously, such as performance parameters like energy density, cycle life, discharge capacity, charge-discharge rate, etc. Also, it is necessary to consider the safety of the battery.

[0058] The safety of the battery includes many aspects. Among them, in terms of fixing the battery cells, in order to improve the stability and safety of the battery cells in the battery, usually, a plurality of battery cells are fixed and installed in the housing by an adhesive structure. Taking the example that the battery cells are fixed in the housing by adhesion with a structural adhesive between the battery cells and a certain surface of the housing, when selecting a structural adhesive, usually two types are included. One is the "high-strength adhesive". Such an adhesive has a large adhesive strength and is firmly adhered to the housing. Due to the high strength of the "high-strength adhesive", synchronous deformation between the housing and the battery cells can be realized. However, during the use process of the battery cells, the battery cells may expand and deform. In such a form of "high-strength adhesive", limited by the strength of the adhesive, after the battery cells expand and deform, there is a high possibility that the adhesive will crack at its edge, and there is also a risk that the high-strength adhesive will crack under low-temperature vibration shock. The other is the "high-elasticity adhesive". Such an adhesive has high elasticity and high elongation rate, has a strong deformation ability of the adhesive, can stretch along with the deformation, and furthermore, synchronous deformation between the housing and the battery cells is realized by the deformation of the adhesive. However, in such a form of "high-elasticity adhesive", since the elongation rate of the adhesive is large and the relative strength is low, the overall stiffness of the battery is low, the structure is not stable, during the use process of the battery, the battery cells and the housing are not sufficiently stable, and there is a risk of structural failure.

[0059] Therefore, the adhesive member installed on the surface of the battery cell according to the embodiment of the present application includes two types of adhesive structures. The first adhesive structure is located around the second adhesive structure, and the elongation at break of the first adhesive structure is greater than that of the second adhesive structure. In this way, not only can the stiffness and stability of the entire battery cell in the battery be ensured, but also the adhesive will not tear due to the expansion and deformation of the battery cell. Furthermore, it is possible to avoid battery failure due to vibration and shock after the adhesive tears.

[0060] All the technical solutions described in the embodiments of the present application are applicable to various devices using batteries, such as mobile phones, portable devices, notebook computers, electric bicycles, electric toys, electric tools, electric vehicles, ships, and spacecraft such as airplanes, rockets, space shuttles, and space shuttles.

[0061] In addition, the technical solutions described in the embodiments of the present application are applicable not only to the above-mentioned devices but also to all devices using batteries. However, for the convenience of description, all the following embodiments will be described by taking an electric vehicle as an example.

[0062] For example, as shown in FIG. 1, it is a schematic configuration diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gasoline vehicle, or a new energy vehicle, and the new energy vehicle may be a battery electric vehicle, a hybrid vehicle, an extended-range electric vehicle, or the like. A motor 40, a controller 30, and a battery 10 may be installed inside the vehicle 1. The controller 30 is used to control the battery 10 to provide power to the motor 40. For example, the battery 10 can be installed at the bottom of the vehicle 1, or at the front or rear of the vehicle. The battery 10 may be used to provide power to the vehicle 1. For example, the battery 10 may be used as the operating power source of the vehicle 1 and used in the circuit system of the vehicle 1. For example, it is used for the starting, navigation, and operating power requirements of the vehicle 1 during driving. In another embodiment of the present application, the battery 10 can not only be the operating power source of the vehicle 1 but also be the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1.

[0063] To meet various power usage demands, the battery may include a plurality of battery cells. Among others, the plurality of battery cells may be connected in series, in parallel, or in a series-parallel connection. The series-parallel connection refers to a combination of series connection and parallel connection. The battery may also be called a battery pack. In some embodiments, a plurality of battery cells may first be connected in series, in parallel, or in a series-parallel connection to form a battery module, and a plurality of battery modules may be further connected in series, in parallel, or in a series-parallel connection to form a battery. That is, a plurality of battery cells may directly form a battery, or first form a battery module and then form a battery with the battery module.

[0064] For example, as shown in FIG. 2, it is a schematic configuration diagram of a battery 10 according to an embodiment of the present application. The battery 10 may include at least one battery module 200 composed of a plurality of battery cells 20. The battery 10 may further include a housing. The interior of the housing has a hollow structure, and a plurality of battery cells 20 are accommodated in the housing. As shown in FIG. 2, the housing may include two parts, hereinafter referred to as a first housing 111 and a second housing 112 respectively, and the first housing 111 and the second housing 112 are fitted together. The shapes of the first housing 111 and the second housing 112 may be determined according to the shape of the battery module 200 combined, and at least one of the first housing 111 and the second housing 112 has one opening. For example, as shown in FIG. 2, both the first housing 111 and the second housing 112 are hollow rectangular parallelepipeds, and only one surface of each is an opening surface. The opening of the first housing 111 and the opening of the second housing 112 are arranged opposite to each other, and the first housing 111 and the second housing 112 are fitted to each other to form a housing having a sealed chamber. Also, for example, different from that shown in FIG. 2, only one of the first housing 111 and the second housing 112 may be a hollow rectangular parallelepiped having an opening, and the other may be plate-shaped so as to cover the opening. For example, taking the case where the second housing 112 is a hollow rectangular parallelepiped and only one surface is an opening surface, and the first housing 111 is plate-shaped as an example, the first housing 111 is covered by the opening of the second housing 112 to form a housing having a closed chamber that can be used to accommodate a plurality of battery cells 20. The plurality of battery cells 20 are connected in parallel, in series, or in series-parallel with each other and combined, and then placed in the housing formed after being fitted by the first housing 111 and the second housing 112.

[0065] In some embodiments, the battery 10 may include other structures, and the repeated descriptions are omitted herein. For example, the battery 10 may further include a confluence member for realizing electrical connection between a plurality of battery cells 20, such as parallel connection, series connection, or series-parallel connection. Specifically, the confluence member can realize electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the confluence member can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the plurality of battery cells 20 can further be led out through the housing by a conductive mechanism.

[0066] According to various power demands, the number of battery cells 20 in the battery module 200 may be any number. To achieve a large capacity or power, a plurality of battery cells 20 may be connected in series, parallel, or series-parallel. Since the number of battery cells 20 included in each battery 10 may be large, for easy assembly, the battery cells 20 can be grouped and installed, and the battery module 200 can be constituted by the battery cells 20 of each group. The number of battery cells 20 included in the battery module 200 is not limited and may be provided as needed.

[0067] FIG. 3 is a schematic configuration diagram of a battery cell 20 according to an embodiment of the present application. The battery cell 20 includes one or more electrode assemblies 22, a case 211, and a cover plate 212. The case 211 and the cover plate 212 form a housing 21. Both the wall of the case 211 and the cover plate 212 are referred to as the walls of the battery cell 20. The case 211 is determined according to the shape after combining one or more electrode assemblies 22. For example, the case 211 may be a hollow rectangular parallelepiped, a cube, or a cylinder, and one surface of the case 211 has an opening so that one or more electrode assemblies 22 can be placed inside the case 211. For example, when the case 211 is a hollow rectangular parallelepiped or a cube, one plane of the case 211 is an opening surface, that is, the plane has no wall body so that the inside and outside of the case 211 communicate with each other. When the case 211 may be a hollow cylinder, the end face of the case 211 is an opening surface, that is, the end face has no wall body so that the inside and outside of the case 211 communicate with each other. The cover plate 212 covers the opening and is connected to the case 211 to form a sealed chamber in which the electrode assembly 22 is placed. The case 211 is filled with an electrolyte, for example, an electrolytic solution.

[0068] The battery cell 20 may further include two electrode terminals 214 installed on the cover plate 212. The cover plate 212 is usually in a flat plate shape, and the two electrode terminals 214 are fixed to the plane of the cover plate 212 and are a positive electrode terminal 214a and a negative electrode terminal 214b, respectively. The polarities of the two electrode terminals 214 are opposite. For example, when the first electrode terminal 214a is a positive electrode terminal, the second electrode terminal 214b is a negative electrode terminal. One connection member 23 located between the cover plate 212 and the electrode assembly 22 is respectively installed corresponding to each electrode terminal 214 to realize the electrical connection between the electrode assembly 22 and the electrode terminal 214.

[0069] As shown in FIG. 3, each electrode assembly 22 has a first tab 221a and a second tab 222a. The polarities of the first tab 221a and the second tab 222a are opposite. For example, when the first tab 221a is a positive electrode tab, the second tab 222a is a negative electrode tab. The first tabs 221a of one or more electrode assemblies 22 are connected to one electrode terminal via one connection member 23, and the second tabs 222a of one or more electrode assemblies 22 are connected to the other electrode terminal via the other connection member 23. For example, the positive electrode terminal 214a is connected to the positive electrode tab via one connection member 23, and the negative electrode terminal 214b is connected to the negative electrode tab via the other connection member 23.

[0070] In the battery cell 20, according to actual requirements, the electrode assemblies 22 may be one or more. As shown in FIG. 3, four independent electrode assemblies 22 are installed in the battery cell 20.

[0071] In addition, in order to improve the safety of the battery cell 20, a pressure relief mechanism may further be installed on one wall of the battery cell 20. For example, a pressure relief mechanism may be installed on the first wall of the battery cell 20. Among them, the first wall may be any one of the walls of the battery cell 20. The pressure relief mechanism is used to operate when the internal pressure or temperature of the battery cell 20 reaches a threshold value to release the internal pressure or temperature. Specifically, when there is too much gas generated in the battery cell 20 and the internal pressure of the case 211 rises and reaches the threshold value, or when the internal temperature of the battery cell 20 rises due to the reaction inside the battery cell 20 to generate heat and reaches the threshold value, the pressure relief mechanism ruptures, so that the inside and outside of the case 211 communicate with each other, and the gas pressure and temperature are released to the outside due to the cracking of the pressure relief mechanism, and further, it is possible to avoid the explosion of the battery cell 20.

[0072] In the embodiments of the present application, the battery cell 20 needs to be fixed within the housing. For example, taking the installation of a structural adhesive on the surface of the battery cell 20 to fix the battery cell 20 as an example, when selecting a structural adhesive, usually two types are included. One is the "high-strength adhesive". Such an adhesive has a large adhesive strength, the battery cell 20 is firmly adhered to the housing, and the high strength of the "high-strength adhesive" can realize the synchronous deformation of the housing and the battery cell 20. However, during the use of the battery cell 20, the battery cell 20 may expand and deform. In such a form of "high-strength adhesive", limited by the strength of the adhesive, after the battery cell 20 expands and deforms, there is a high possibility that the adhesive will crack at its edge, and there is also a risk that the high-strength adhesive will crack under low-temperature vibration shock. The other is the "high-elasticity adhesive". Such an adhesive has high elasticity and high elongation rate, the deformation ability of the adhesive is strong, and it can stretch along with the deformation. Furthermore, the synchronous deformation between the housing and the battery cell 20 is realized by the deformation of the adhesive. However, in such a form of "high-elasticity adhesive", since the elongation rate of the adhesive is large and the relative strength is low, the overall stiffness of the battery 10 is low, the structure is unstable, and during the use of the battery 10, the battery cell 20 and the housing are not sufficiently stable, and there is a risk of structural failure.

[0073] Therefore, the embodiments of the present application provide a battery that can solve the above problems.

[0074] FIG. 4 and FIG. 6 respectively show exploded schematic views of the battery 10 of different embodiments of the present application. Accordingly, FIG. 5 is a partial cross-sectional view of the battery 10 shown in FIG. 4, and FIG. 7 is a partial cross-sectional view of the battery 10 shown in FIG. 6. As shown in FIGS. 4 to 7, the battery 10 includes a battery cell 20 and a first member. The first surface 1111 of the first member and at least one battery cell 20 are connected by an adhesive member 50 including a first adhesive structure 51 and a second adhesive structure 52. The first adhesive structure 51 is located around the second adhesive structure 52, and the elongation at break of the first adhesive structure 51 is greater than that of the second adhesive structure 52.

[0075] Therefore, for the battery 10 according to the embodiment of the present application, an adhesive member 50 including two types of adhesive structures is installed between the battery cell 20 and the first member to fix the battery cell 20. The first member can include the housing of the battery 10 or the upper cover 113 inside the housing, such that the first adhesive structure 51 with a large elongation at break is located around the second adhesive structure 52 with a small elongation at break. In this way, after the battery cell 20 expands and deforms, the edge position is the first adhesive structure 51 with a high elongation at break, maintaining the connection and fixation between the battery cell 20 and the upper cover 113 or between the battery cell 20 and the housing, improving the stability of the battery cell 20 in the battery 10, and further improving the safety of the battery 10.

[0076] In addition, in the embodiment of the present application, the first adhesive structure 51 being provided around the second adhesive structure 52 includes the first adhesive structure 51 surrounding the outer periphery of the second adhesive structure 52, or the first adhesive structure 51 being provided in a partial area around the second adhesive structure 52 and incompletely surrounding the second adhesive structure 52, but the embodiment of the present application is not limited thereto. For the convenience of description, in the embodiment of the present application, mainly the case where the first adhesive structure 51 surrounds the second adhesive structure 52 will be described as an example.

[0077] And the shape of the second adhesive structure 52 in the embodiment of the present application may be installed according to the actual application. For example, the second adhesive structure 52 may be rectangular or circular. Correspondingly, the shape of the first adhesive structure 51 may also be installed according to the actual application. For example, the first adhesive structure 52 may be installed as an angular ring or a circular ring, but the embodiment of the present application is not limited thereto. For the convenience of description, in the embodiment of the present application, mainly the case where the first adhesive structure 51 is an angular ring and the second adhesive structure 52 is square will be described as an example.

[0078] Note that the first surface of the first member according to the embodiment of the present application may be any one of the surfaces where the first member is connected to the battery cell 20, and the first member may include one or more first surfaces 1111. Specifically, the first member may include a housing, the housing may include a first housing 111 and a second housing 112, and the first surface 1111 may be any one of the surfaces of the first housing 111 or the second housing 112. In some embodiments, the first member may further include an upper cover 113, and the first surface 1111 may further be one of the surfaces of the upper cover 113.

[0079] In some embodiments, as shown in FIGS. 4 to 7, when the upper cover 113 is included in the battery 10, the upper cover 113 is usually provided between the battery cell 20 and the housing. For example, in FIGS. 4 to 7, taking the case where the upper cover 113 is provided between the battery cell 20 and the first housing 111 of the housing as an example, the battery cell 20 in the battery 10 can be connected and fixed to the upper cover 113 by an adhesive member 50. That is, the surface of the upper cover 113 facing the battery cell 20 is the first surface 1111. Also, on one side where the upper cover 113 is not provided in the housing, for example, between the battery cell 20 and the second housing 112 in FIGS. 4 to 7, the battery cell 20 may be directly fixed to the surface of the second housing 112 of the housing by an adhesive member 50. For example, as shown in FIGS. 4 to 7, the battery cell 20 may be connected and fixed to the second housing 112, that is, the second housing 112 may have the first surface 1111.

[0080] In some embodiments, when the upper cover 113 is not included in the battery 10, the battery cell 20 and the first housing 111 may be fixedly connected by an adhesive member 50, that is, the first housing 111 has the first surface 1111. And an adhesive member 50 may be installed between the battery cell 20 and the second housing 112, that is, the second housing 112 may have the first surface 1111, but the embodiments of the present application are not limited thereto.

[0081] For convenience of explanation, in the drawings of the present application, it is taken as an example that the battery 10 has an upper cover 113 in all cases. For example, the first surface 1111 includes one inner surface of the second housing 112 shown in FIGS. 4 to 7 and one surface of the upper cover 113 facing the battery cell 20, that is, the surface with the largest area facing the battery cell 20 of the second housing 112 is the first surface 1111, and the surface of the upper cover facing the battery cell 20 is also the first surface 1111. However, the embodiments of the present application are not limited thereto.

[0082] In addition, the battery 10 in the embodiment of the present application may include a plurality of battery cells 20, and the installation direction of each battery cell 20 among the plurality of battery cells 20 may be flexibly installed according to actual applications. Specifically, taking the rectangular parallelepiped battery cell 20 shown in FIG. 3 here as an example, when such a plurality of battery cells 20 are fixed and installed in a housing, the installation directions of each battery cell 20 in the housing may be the same.

[0083] As shown in FIGS. 4 to 7, the battery 10 may include a plurality of battery cell packs arranged in the first direction Y. The first direction Y is perpendicular to the first surface 1111, that is, the battery cells 20 in the battery 10 are installed in one layer or multiple layers, and one battery cell pack may be formed by the battery cells 20 in each layer. For example, taking two layers in FIGS. 4 to 7 as an example, that is, including two battery cell packs. Each battery cell pack among the plurality of battery cell packs includes at least two battery cells 20 arranged in the second direction X perpendicular to the first direction Y. For example, in FIGS. 4 to 7, taking the example that each battery cell pack includes six battery cells 20 arranged in the X direction, and in this specification and Although each battery cell pack as shown in FIGS. 4 to 7 is described by taking an example of including only one row of battery cells, each battery cell pack included in the battery 10 may include multiple rows of battery cells including at least two battery cells 20 arranged in the second direction X for each row. The embodiments of the present application are not limited thereto.

[0084] In an embodiment of the present application, an adhesive member 50 is provided between the first battery cell pack among a plurality of battery cell packs and the first surface 1111, that is, an adhesive member 50 is provided between the second surface 201 of the battery cell 20 in the first battery cell pack and the first surface 1111. Specifically, the plurality of battery cell packs may include one or more first battery cell packs. For example, as shown in FIGS. 4 to 7, since the battery cell pack located in the uppermost layer among the plurality of battery cell packs can be connected and fixed to the first surface 1111 of the upper cover 113, the battery cell pack in the uppermost layer may be the first battery cell pack. That is, the upper surface of the battery cell 20 in the uppermost first battery cell pack is the second surface 201, and an adhesive member 50 is provided between the second surface 201 and the first surface 1111. Similarly, as shown in FIGS. 4 to 7, since the battery cell pack located in the lowermost layer among the plurality of battery cell packs can be connected and fixed to the first surface 1111 of the second housing 112, the battery cell pack in the lowermost layer may be the first battery cell pack. That is, the lowermost the lower surface of the battery cell 20 of the first battery cell pack may be the second surface 201, and an adhesive member 50 is provided between the second surface 201 and the first surface 1111 of the second housing 112.

[0085] It should be noted that the battery cell 20 in the embodiment of the present application is rectangular, and an adhesive member 50 is provided between the second surface 201 of the battery cell 20 in the first battery cell pack and the first surface 1111. Among them, in order to increase the adhesion area between the adhesive member 50 and the battery cell 20 and improve the adhesion strength between the two, the second surface 201 may be the surface with the largest surface area of each battery cell 20. For example, as shown in FIGS. 4 to 7, the rectangular battery cell 20 has six side walls. Among them, the case 211 has two side walls with large areas, and the second surface 201 provided with the adhesive member 50 can be formed on the side walls. By installing the battery cell 20 in this way, it can contribute to the heat dissipation of the battery cell 20.

[0086] In an embodiment of the present application, one or more adhesive members 50 may be provided between the first battery cell pack and the first surface 1111. For the convenience of description, hereinafter, based on the drawings, first, taking the case where a plurality of adhesive members 50 are provided between the first battery cell pack and the first surface 1111 as an example, the adhesive member 50 according to the embodiment of the present application will be described in detail.

[0087] In some embodiments, as one example, a plurality of adhesive members 50 may be provided between the first battery cell pack and the first surface 1111. For example, as shown in FIGS. 4 to 7, the plurality of adhesive members 50 and the battery cells 20 in the first battery cell pack correspond one-to-one.

[0088] Corresponding to FIGS. 4 and 5, FIG. 8 shows an exploded schematic view of the battery cells 20 and the adhesive members 50 in FIGS. 4 and 5, FIG. 9 shows a schematic view of the adhesive members 50 installed on the surface of the battery cells 20, FIG. 10 is a side view of the battery cells 20 with the adhesive members 50 installed on the surface during expansion, and FIG. 11 is a partial cross-sectional view in the A-A' direction shown in FIG. 10. As shown in FIGS. 8 to 11, one adhesive member 50 including a first adhesive structure 51 and a second adhesive structure 52 is provided on the second surface 201 of one battery cell 20, and the first adhesive structure 51 is provided around the second adhesive structure 52. In this way, when the battery cells 20 expand and deform, the stability of each battery cell 20 can be better ensured.

[0089] In addition, the adhesive member 50 may be located in any region of the second surface 201 of one battery cell 20. For example, as shown in FIGS. 8 to 11, the adhesive member 50 can almost completely cover the second surface 201 of the battery cell 20. Alternatively, the adhesive member 50 can also occupy a partial region of the second surface 201. And, as shown in FIG. 11, after the battery cell 20 expands and deforms, the amount of deformation in the central region of the second surface 201 of the battery cell 20 is large, and the amount of deformation in the edge region is small. That is, the distance by which the central position of the battery cell 20 moves away from the first surface 1111 is smaller than the distance by which the edge region moves away from the first surface 1111. Therefore, the second adhesive structure 52 having a small elongation at break and a large strength can be provided at the central position of each battery cell 20. That is, the second adhesive structure 52 covers the center point of the battery cell 20 such that the first adhesive structure 51 is at the edge position around the second surface 201. Among them, the central region or the central position of the second surface 201 of the battery cell 20 includes the center point of the second surface 201 of the battery cell 20. In this way, the second adhesive structure 52 at the central position of the battery cell 20 can ensure the relative stability between the battery cell 20 and the first surface 1111, and the relatively large elongation at break of the first adhesive structure 51 at the edge around each battery cell 20 can ensure that the adhesive does not tear between the edge around each battery cell 20 and the first surface 1111.

[0090] In some embodiments, the area of the second surface 201 of one battery cell 20 is denoted as S0. Accordingly, the area where the first adhesive structure 51 contacts the second surface 201 is S1 (accordingly, the area where the first adhesive structure 51 contacts the first surface 1111 can also be denoted as S1), and the area where the second adhesive structure 52 contacts the second surface 201 is S2 (accordingly, the area where the second adhesive structure 52 contacts the first surface 1111 can also be denoted as S2). S0, S1, and S2 may be arranged to satisfy 0.25 ≦ (S1 + S2) / S0 < 1. For example, S0, S1, and S2 may be arranged to satisfy 0.5 ≦ (S1 + S2) / S0 ≦ 0.85. Further, S1 and S2 may be arranged to satisfy 0.05 ≦ S1 / (S1 + S2) ≦ 0.85. For example, S1 and S2 may be arranged to satisfy 0.15 ≦ S1 / (S1 + S2) ≦ 0.55.

[0091] In some embodiments, as shown in FIGS. 8 to 11, the first adhesive structure 51 surrounds the outer periphery of the second adhesive structure 52. However, since the first adhesive structure 51 and the second adhesive structure 52 are made of different materials, as shown in FIGS. 6 and 7, a blocking member 53 may be further installed between the first adhesive structure 51 and the second adhesive structure 52 to avoid the mutual influence therebetween.

[0092] Corresponding to FIGS. 6 and 7, FIG. 12 shows another exploded schematic view of the battery cell 20 and the adhesive member 50 in FIGS. 6 and 7. Accordingly, FIG. 13 shows another schematic view when the adhesive member 50 is installed on the surface of the battery cell 20 and the battery cell expands. For the battery cell 20 shown in FIGS. 12 and 13, its side view may still be FIG. 10, and the corresponding partial cross-sectional view in the A-A' direction is as shown in FIG. 14. As shown in FIGS. 12 to 14, one adhesive member 50 including the first adhesive structure 51 and the second adhesive structure 52 is provided on the second surface 201 of one battery cell 20. Further, a blocking member 53 is provided between the first adhesive structure 51 and the second adhesive structure 52.

[0093] In some embodiments, to inhibit the mutual influence between the first adhesive structure 51 and the second adhesive structure 52, the blocking member 53 may be a foam, a plastic part, etc. And the shape of the blocking member 53 may be installed according to the actual application. For example, according to the shapes of the first adhesive structure 51 and the second adhesive structure 52, the shape of the blocking member 53 can be correspondingly installed. For example, in FIGS. 12 to 14, take the case where the blocking member 53 is an angle ring as an example.

[0094] In some embodiments, in order to avoid the mutual influence between the first adhesive structure 51 and the second adhesive structure 52, if the blocking member 53 is not installed, a gap may be provided between the first adhesive structure 51 and the second adhesive structure 52. In this way, there is no need to install an extra member, and the installation method is also simple. For example, in FIGS. 12 to 14, by changing to install a gap at a certain position of the blocking member 53, the mutual influence between the first adhesive structure 51 and the second adhesive structure 52 can be similarly avoided. The embodiments of the present application are not limited to this.

[0095] In addition, when there is a blocking member 53 or a gap, the ratios of the first adhesive structure 51 and the second adhesive structure 52 can still be assigned according to the relationship that satisfies the above S0, S1, and S2. The repeated descriptions here are omitted.

[0096] Regarding each of the above embodiments in FIGS. 4 to 14, by setting the ratio of the areas of the first adhesive structure 51 and the second adhesive structure 52 as described above, the amount of adhesive used can be reduced as much as possible while ensuring the structural strength.

[0097] The battery cell 20 and the adhesive member 50 are in one-to-one correspondence, and taking the installation of the blocking member 53 as an example, the battery 10 is measured. Among them, both the first adhesive structure 51 and the second adhesive structure 52 can take the use of a polyurethane material as an example. Specifically, before measurement, first, according to the parameters described in "Initial ratio (S1 + S2) / S0" in Table 1, the ratio of the area of the adhesive member 50 is set respectively, and the ratio S1 / (S1 + S2) of the areas of the first adhesive structure 51 and the second adhesive structure 52 is set to 0.15, and the measurement condition is 60 °C. Among them, considering that the adhesive member 50 is provided on the surface of one side wall of one battery cell 20, it is not possible for the ratio of the area where the adhesive member 50 contacts the surface to the area of the surface to be greater than 1. Therefore, all the numerical values of "Initial ratio (S1 + S2) / S0" in Table 1 are smaller than or equal to 1. In the cycle test, the voltage range is from 2.8 V to 4.2 V. After charging at a rate of 2C and then discharging at a rate of 3C, the cycle capacity retention rate was obtained after 800 cycles. The cycle capacity retention rate is the ratio of the 3C discharge capacity of the 800th cycle to the second 3C discharge capacity, and the cycle capacity retention rate was the "Capacity retention rate" in Table 1. Then, after 800 cycles, vibration shock measurement was performed at the coupling temperature to determine the result of "Vibration shock" in Table 1. If the vibration shock measurement passes, by using an ultrasonic detector to determine the ratio of the area of the remaining adhesive member 50 on the surface of the battery cell 20, the corresponding "Ratio of remaining adhesive area" in the last column of Table 1 can be obtained. The ratio of the area of the remaining adhesive was still set to (S1 + S2) / S0.

[0098]

Table 1

[0099] As can be seen from Table 1, when the area where the adhesive member 50 contacts the first surface 1111 or the area where the battery cell 20 contacts the second surface 201 is small, especially when the area ratio (S1 + S2) / S0 is smaller than 0.25, for example, when (S1 + S2) / S0 is equal to 0.2, the adhesive member50 has a weak binding force on the battery cell 20, has a risk of failure due to vibration and shock, and the capacity maintenance rate of the battery cell 20 deteriorates. When the area where the adhesive member 50 contacts the first surface 1111 or the area where the battery cell 20 contacts the second surface 201 is too large, for example, when the proportionality of the area (S1 + S2) / S0 is equal to 1, it also causes the adhesive to overflow and adhere to structural parts such as the electrode terminals or battery wire harnesses of the battery cell 20, and further causes vibration and shock, with a risk of failure. Therefore, when 0.25 ≦ (S1 + S2) / S0 < 1, it can not only ensure that the battery does not fail even under vibration, but also ensure that the battery is in a good interval of capacity maintenance rate.

[0100] As can be seen from the data of Examples 1 to 2, when (S1 + S2) / S0 is equal to 0.25, the battery capacity maintenance rate is reduced compared to the battery capacity maintenance rates of Examples 2 and 3, and the remaining adhesive area ratio is also reduced. Therefore, when 0.5 ≦ (S1 + S2) / S0 ≦ 0.85, the vibration-resistant dynamic shock and capacity maintenance rate of the battery become better.

[0101] Furthermore, still taking the examples in FIGS. 6 and 7 as an example under the same measurement conditions as in Table 1, as shown in Table 2, when the ratio of S1 and S2 is different, the measurement results are as shown in Table 2. Specifically, as shown in Table 2, when (S1 + S2) / S0 is set to 0.85, the ratio of S1 and S2 is adjusted, that is, the ratio of S1 and S2 is set according to "S1 / (S1 + S2)" shown in Table 2 to obtain three corresponding types of performances. Among them, the "remaining adhesive area ratio" is the ratio of S1 / (S1 + S2) measured and obtained after passing through the vibration shock measurement.

[0102]

Table 2

[0103] As can be seen from Table 2, the ratio of the adhesive application area in the first bonding structure 51 located at the edge position affects the structural strength. By increasing the content of the first bonding structure 51 within a certain range, it contributes to the improvement of the structural strength and the capacity retention rate of the battery 10. When S1 / (S1 + S2) is equal to 1, since the battery 10 fails due to vibration and shock, it is shown that when only the first bonding structure 51 is used, the binding strength for the battery 10 with member 50 becomes weak. When S1 / (S1 + S2) is equal to 0.02, since the battery 10 fails due to vibration and shock, it is shown that when most of the adhesives member 50 are the second bonding structure 52, it still causes the problem that the adhesive tears. When 0.05 ≤ S1 / (S1 + S2) ≤ 0.85, not only can it be ensured that the battery 10 does not fail even under vibration, but it can also be ensured that the capacity retention rate of the battery 10 is in a good range. Comparing Examples 5 to 9, when 0.15 ≤ S1 / (S1 + S2) ≤ 0.55, the remaining adhesive area ratio is 0.62 - 0.82, and it is known that the vibration and shock resistance performance of the battery 10 becomes better.

[0104] In addition, the thickness h of the adhesive member 50 may be set to 0.02 cm ≤ h ≤ 1 cm, for example, it may also be set to 0.05 cm ≤ h ≤ 0.5 cm.

[0105] In addition, although FIGS. 8 to 14 above have all been described by taking as an example that one adhesive member 50 is installed corresponding to one battery cell 20, different from this, a plurality of battery cells 20 in the first battery cell pack may be installed corresponding to one adhesive member 50.

[0106] In some embodiments, as another example, one adhesive member 50 may be provided corresponding to a plurality of battery cells 20 in the embodiments of the present application. For example, FIG. 15 shows another exploded schematic view of the battery 10 according to the embodiment of the present application, and FIG. 16 is a partial cross-sectional view of FIG. 15. As shown in FIGS. 15 and 16, one adhesive member 50 may be provided between the first battery cell pack and the first surface 1111. That is, one adhesive member 50 is installed on the first battery cell pack corresponding to all the battery cells 20. Further, for example, a plurality of adhesive members 50 may be installed between the first battery cell pack and the first surface 1111. Among them, each adhesive member 50 corresponds to a plurality of battery cells 20.

[0107] Specifically, FIG. 17 shows an exploded schematic view of a plurality of battery cells 20 and the adhesive member 50 according to the embodiment of the present application, and FIG. 18 shows a schematic view of the adhesive member 50 installed on the surface of a plurality of battery cells 20 according to the embodiment of the present application. For the convenience of explanation, as shown in FIGS. 17 and 18, here, taking the example that one adhesive member 50 is installed on the second surface 201 of three battery cells 20, that is, the second surface 201 provided with one adhesive member 50 includes one side wall of each battery cell 20 among the three battery cells 20. By installing the same adhesive member 50 corresponding to a plurality of battery cells 20, when the number of battery cells 20 included in the battery 10 is large, the processing process can be simplified.

[0108] In addition, by comparing the differences between FIG. 17 and FIG. 8, or by comparing the differences between FIG. 18 and FIG. 9, all of these differences lie only in the number of battery cells 20 corresponding to one adhesive member 50. And the partial cross-sectional view obtained in the direction of B-B' in FIG. 19 is consistent with FIG. 11. For the sake of simplicity, the repeated descriptions are omitted here.

[0109] In addition, one adhesive member 50 may be located in any region of the second surface 201 of a plurality of battery cells 20. For example, as shown in FIGS. 15 to 18, the adhesive member 50 can almost completely cover the second surface 201 of the plurality of battery cells 20. Alternatively, the adhesive member 50 can also occupy a partial region of the second surface 201. Based on FIGS. 19 and 11, the second surface 201 is formed by the surfaces of the plurality of battery cells 20. After the battery cells 20 expand and deform, the deformation amount of the central region of the side wall of each battery cell 20 is large, and the deformation amount of the edge region is small. That is, the distance at which the central position of the battery cell 20 moves away from the first surface 1111 is smaller than the distance at which the edge region moves away from the first surface 1111. Therefore, a second adhesive structure 52 with a small elongation at break and a high strength can be provided at the central position of the second surface 201. That is, the second adhesive structure 52 covers the central point of the second surface 201 so that it can cover the central points of the plurality of battery cells 20 as much as possible. To avoid the risk that the adhesive tears at the edge, the first adhesive structure 51 is located at the edge position around the second surface 201. Among them, the central region or the central position of the second surface 201 includes the central point of the second surface 201. In this way, the second adhesive structure 52 at the central position of the second surface 201 can ensure the relative stability between the plurality of battery cells 20 and the first surface 1111, and the relatively large elongation at break of the first adhesive structure 51 at the edge around the second surface 201 can ensure that the adhesive does not tear between the edge around the battery cell 20 and the first surface 1111.

[0110] In some embodiments, referring to the embodiments of FIGS. 12 and 13, regarding the provision of one adhesive member 50 on the surface of a plurality of battery cells 20, in order to avoid the mutual influence between the first adhesive structure 51 and the second adhesive structure 52, similarly, a blocking member 53 or a gap can be provided between the first adhesive structure 51 and the second adhesive structure 52.

[0111] In some embodiments, regarding that one adhesive member 50 is provided on the surfaces of a plurality of battery cells 20, that is, when one adhesive member 50 is installed between the second surface 201 jointly formed by the plurality of battery cells 20 and the first surface 1111, the area of the second surface 201 is denoted as S0, the area where the first adhesive structure 51 contacts the second surface 201 is S1 (correspondingly, the area where the first adhesive structure 51 contacts the first surface 1111 can also be denoted as S1), the area where the second adhesive structure 52 contacts the second surface 201 is S2 (correspondingly, the area where the second adhesive structure 52 contacts the first surface 1111 can also be denoted as S2), and S0, S1, and S2 satisfy 0.25 ≦ (S1 + S2) / S0 < 1. For example, S0, S1, and S2 may be installed to satisfy 0.5 ≦ (S1 + S2) / S0 ≦ 0.85. Further, S1 and S2 may be installed to satisfy 0.05 ≦ S1 / (S1 + S2) ≦ 0.85, for example, S1 and S2 may be installed to satisfy 0.15 ≦ S1 / (S1 + S2) ≦ 0.55.

[0112] Similar to the effects of the embodiments in FIGS. 4 to 14, by setting the proportional relationship of the areas of the first adhesive structure 51 and the second adhesive structure 52 as described above, while ensuring the structural strength, the usage amount of the adhesive can be reduced as much as possible. The repeated description here is omitted.

[0113] In some embodiments, the thickness h of the adhesive member 50 may be set to 0.02 cm ≦ h ≦ 1 cm, for example, 0.05 cm ≦ h ≦ 0.5 cm.

[0114] In addition, as described above, based on the drawings, the installation position etc. of the adhesive member 50 according to the embodiments of the present application have been described. Next, the material of the adhesive member 50 will be described in detail.

[0115] The elongation at break of the first adhesive structure 51 according to the embodiment of the present application is greater than that of the second adhesive structure 52. Specifically, the elongation at break A1 of the first adhesive structure 51 may be set to satisfy 100% ≤ A1 ≤ 500%, and / or the elongation at break B1 of the second adhesive structure 52 may be set to satisfy 10% ≤ B1 ≤ 150%. For example, the elongation at break A1 of the first adhesive structure 51 satisfies 150% ≤ B1 ≤ 400%, and / or the elongation at break B1 of the second adhesive structure 52 satisfies 60% ≤ B1 ≤ 120%.

[0116] In some embodiments, the measurement method of the elongation at break of the first adhesive structure 51 and the second adhesive structure 52 in the embodiment of the present application may refer to ISO 527-2 and can be measured using a fully cured adhesive tape. Among them, the tensile speed is 10 mm / min.

[0117] For example, the first adhesive structure 51 and the second adhesive structure 52 can be peeled from the first surface 1111 or the second surface 201 by cutting or freezing, cut into a block shape of 10 mm * 20 mm and a thickness of 1 mm, and the elongation at break can be measured by a tensile machine. The specific measurement method refers to ISO 527-2.

[0118] It should be noted that considering that the strength of the adhesive structure such as the adhesive is usually in a positive correlation with the elastic modulus and the elongation at break is in a negative correlation with the elastic modulus, the first adhesive structure 51 and the second adhesive structure 52 may be installed to satisfy other relationships.

[0119] In some embodiments, the elastic modulus of the first adhesive structure 51 may be set to be smaller than that of the second adhesive structure 52. Specifically, the elastic modulus A2 of the first adhesive structure 51 is set to satisfy 10 MPa ≤ A2 ≤ 150 MPa, and / or the elastic modulus B2 of the second adhesive structure 52 may be set to satisfy 150 MPa ≤ B2 ≤ 1000 MPa. For example, the elastic modulus A2 of the first adhesive structure 51 is set to satisfy 30 MPa ≤ A2 ≤ 60 MPa, and / or the elastic modulus B2 of the second adhesive structure 52 is set to satisfy 150 MPa ≤ B2 ≤ 500 MPa.

[0120] Note that the elastic modulus according to the embodiments of the present application is the elastic modulus at room temperature, and the measurement method of the elastic modulus may be a standard measurement method for measuring the strength of the adhesive by dynamic thermomechanical analysis (DMA) with reference to IPC-TM-650 2.4.24.4.

[0121] In some embodiments, further, the first adhesive structure 51 may be arranged such that its strength is smaller than that of the second adhesive structure 52. Specifically, the strength A3 of the first adhesive structure 51 may be arranged to satisfy 2 MPa ≤ A3 ≤ 15 MPa, and / or the strength B3 of the second adhesive structure 52 may be arranged to satisfy 6 MPa ≤ B3 ≤ 25 MPa. For example, the strength A3 of the first adhesive structure 51 satisfies 6 MPa ≤ A3 ≤ 15 MPa, and / or the strength B3 of the second adhesive structure 52 satisfies 8 MPa ≤ B3 ≤ 25 MPa.

[0122] Note that the strength according to the embodiments of the present application may include volume strength and / or shear strength. Specifically, the volume strength is measured with reference to ISO 527-2 using a fully cured adhesive tape, and the tensile speed is 10 mm / min. The shear strength is measured with reference to GB / T 7124.

[0123] In some embodiments, for the material of the first adhesive structure 51 according to the embodiments of the present application, those that are liquid or paste-like before solidification can be selected. For example, at least one of epoxy resin, polyurethane, acrylic resin, and organosilicon rubber can be selected, and / or for the material of the second adhesive structure 52, those that are liquid or paste-like before solidification can be selected. For example, at least one of epoxy resin, polyurethane, and acrylic resin can be selected.

[0124] In addition, when selecting the materials for the first bonding structure 51 and the second bonding structure 52, if materials of different features in the same system are selected, they may affect each other. For example, if the materials of the first bonding structure 51 and the second bonding structure 52 are adhesives with different properties in the same polyurethane system, they may react and affect each other. Therefore, it is necessary to install a blocking member 53 or a gap between the first bonding structure 51 and the second bonding structure 52. If the materials of the first bonding structure 51 and the second bonding structure 52 are selected to be non-reactive and not affect each other, for example, when selecting organic silica gel and an adhesive for a polyurethane-type structure respectively, it may not be necessary to install the blocking member 53 and the gap. The embodiments of the present application are not limited thereto.

[0125] Therefore, in the battery 10 according to the embodiment of the present application, an adhesive member 50 including two types of bonding structures is installed between the battery cell 20 and the first member to fix the battery cell 20. The first member may include the housing of the battery 10 or the upper cover 113 inside the housing such that the first bonding structure 51 with a large elongation at break is located around the second bonding structure 52 with a small elongation at break. In this way, after the battery cell 20 expands and deforms, the edge position is the first bonding structure 51 with a high elongation at break, maintaining the connection and fixation between the battery cell 20 and the upper cover 113 or between the battery cell 20 and the housing, improving the stability of the battery cell 20 in the battery 10, and further improving the safety of the battery 10.

[0126] The battery 10 according to the embodiment of the present application has been described above. Next, a method and an apparatus for manufacturing the battery according to the embodiment of the present application will be described. Among them, for the parts not described in detail, the above embodiments can be referred to.

[0127] FIG. 20 shows a schematic flowchart of a method 300 for manufacturing a battery according to an embodiment of the present application. As shown in FIG. 20, the method 300 may include providing a battery cell 20 and providing a first member. Among them, the first surface 1111 of the first member and at least one of the battery cells 20 are connected by an adhesive member 50 including a first adhesive structure 51 and a second adhesive structure 52. The first adhesive structure 51 is located around the second adhesive structure 52, and the elongation at break of the first adhesive structure 51 is greater than that of the second adhesive structure 52.

[0128] FIG. 21 shows a schematic block diagram of an apparatus 400 for manufacturing a battery according to an embodiment of the present application. As shown in FIG. 21, the apparatus 400 may include a providing module 410 used for providing a battery cell 20 and providing a first member. Among them, the first surface 1111 of the first member and at least one of the battery cells 20 are connected by an adhesive member 50 including a first adhesive structure 51 and a second adhesive structure 52. The first adhesive structure 51 is located around the second adhesive structure 52, and the elongation at break of the first adhesive structure 51 is greater than that of the second adhesive structure 52.

[0129] The present application has been described in detail with reference to preferred embodiments. However, various improvements can be made to it without departing from the scope of the present application, and the members therein can be replaced with equivalents. In particular, as long as there is no structural contradiction, any of the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the specification, but includes all technical solutions within the scope of the claims.

Description of Reference Numerals

[0130] 1 Vehicle 10 Battery 20 Battery Cell 21 Housing 22 Electrode Assembly 23 Connection Member 30 Controller 40 Motor 50 Adhesive member 51 First adhesion structure 52 Second adhesion structure 53 Blocking member 111 First housing 112 Second housing 113 Upper cover 200 Battery module 201 Second surface 211 Case 212 Cover plate 214 Electrode terminal 214a Positive electrode terminal 214b Negative electrode terminal 221a First tab 222a Second tab 400 Device 410 Provision module 1111 First surface

Claims

1. A battery comprising a battery cell and a first member, wherein a space between a first surface of the first member and at least one of the battery cells is connected by an adhesive member including a first adhesive structure and a second adhesive structure, the first adhesive structure is located around the second adhesive structure, a breaking elongation rate of the first adhesive structure is greater than that of the second adhesive structure, the adhesive member is used to bond a second surface of at least one of the battery cells to the first surface, an area of the second surface is S0, an area where the first adhesive structure contacts the second surface is S1, an area where the second adhesive structure contacts the second surface is S2, and S0, S1, and S2 satisfy 0.25 ≦ (S1 + S2) / S0 < 1 and 0.05 ≦ S1 / (S1 + S2) ≦ 0.

85. A battery characterized by the above.

2. The breaking elongation rate A1 of the first adhesive structure satisfies 100% ≦ A1 ≦ 500%, and / or The breaking elongation rate B1 of the second adhesive structure satisfies 10% ≦ B1 ≦ 150%. A battery according to Claim 1, characterized by the above.

3. The adhesive member is used to bond a second surface of at least one of the battery cells to the first surface, and the second adhesive structure covers a center point of the second surface. A battery according to Claim 1 or 2, characterized by the above.

4. The first adhesive structure surrounds an outer periphery of the second adhesive structure. A battery according to any one of Claims 1 to 3, characterized by the above.

5. S0, S1, and S2 Satisfy 0.5 ≦ (S1 + S2) / S0 ≦ 0.

85. A battery according to any one of Claims 1 to 4, characterized by the above.

6. S1 and S2 Satisfy 0.15 ≦ S1 / (S1 + S2) ≦ 0.

55. A battery according to any one of Claims 1 to 5, characterized by the above.

7. An elastic modulus of the first adhesive structure is smaller than that of the second adhesive structure. A battery according to any one of Claims 1 to 6, characterized by the above.

8. The elastic modulus A2 of the first adhesive structure satisfies 10 MPa ≦ A2 ≦ 150 MPa, and / or The elastic modulus B2 of the second adhesive structure satisfies 150 MPa ≦ B2 ≦ 1000 MPa. A battery according to Claim 7, characterized by the above.

9. A strength of the first adhesive structure is smaller than that of the second adhesive structure. A battery according to any one of Claims 1 to 8, characterized by the above.

10. ​ The strength A3 of the first bonding structure satisfies 2 MPa ≤ A3 ≤ 15 MPa, and / or the strength B3 of the second bonding structure satisfies 6 MPa ≤ B3 ≤ 25 MPa. The battery according to claim 9, characterized in that.

11. The battery includes a plurality of the battery cells, and a plurality of the bonding members are provided between the plurality of the battery cells and the first surface, and the plurality of the bonding members and the plurality of the battery cells correspond one-to-one. The battery according to any one of claims 1 to 10, characterized in that.

12. A gap is provided between the first bonding structure and the second bonding structure. The battery according to any one of claims 1 to 11, characterized in that.

13. A blocking member is provided between the first bonding structure and the second bonding structure. The battery according to any one of claims 1 to 11, characterized in that.

14. The material of the first bonding structure includes at least one of epoxy resin, polyurethane, acrylic resin, and organic silicone rubber, and / or The material of the second bonding structure includes at least one of epoxy resin, polyurethane, and acrylic resin. The battery according to any one of claims 1 to 13, characterized in that.

15. The battery includes a first housing and a second housing, the first housing and the second housing are engaged to form a housing space for accommodating the battery cells, and the first member includes the first housing and / or the second housing. The battery according to any one of claims 1 to 14, characterized in that.

16. The battery includes an upper lid, a first housing, and a second housing, the first housing and the second housing are engaged to form a housing space for accommodating the battery cells, the upper lid is provided in the housing space and covers the battery cells, and the first member includes the upper lid. The battery according to any one of claims 1 to 14, characterized in that.

17. The largest surface in terms of area in the first housing and / or the second housing is the first surface. The battery according to claim 15 or 16, characterized in that.

18. The battery cell is an electrode assembly, a case having an opening and a cavity for accommodating the electrode assembly, and a cover plate for covering the opening of the case. The battery according to any one of claims 1 to 17, characterized in that.

19. The adhesive member is provided between the largest side wall in terms of area in the case and the first surface. The battery according to claim 18, characterized in that.

20. A power utilization device comprising the battery according to any one of claims 1 to 19 for providing electrical energy. Characterized in that.

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