Battery monomer, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device, the battery monomer comprises an electrode assembly, the electrode assembly comprises a main body part and a tab arranged on the main body part in a protruding manner, the tab is provided with a bonding surface, the bonding surface is provided with a root area, a connection area and a welding printing area, the root area is connected with the main body part, and the connection area is connected between the root area and the welding printing area; the insulating glue is provided with a glue coating surface, and the glue coating surface is provided with a first glue coating area, a non-glue coating area and a second glue coating area which are continuously arranged in the width direction of the insulating glue; wherein the first gluing area is adhered to the main body part, the non-gluing area covers at least one of the root area and the connecting area, and the second gluing area is adhered to the adapter and the welding and printing area. According to the battery monomer, the battery and the power utilization device provided by the invention, the problem that the tabs of the electrode assembly crack due to stress can be relieved, so that the safety of the battery monomer, the battery and the power utilization device can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] The battery includes a battery monomer, and the battery monomer is internally provided with an electrode assembly. In the production and manufacturing process, in order to prevent the tab of the electrode assembly from being overlapped with the main body part of the electrode assembly and causing a safety accident due to virtual welding and missing welding after being welded with the adapter or the pole, usually, after welding, the main body part and the tab are bonded by an insulating glue, and the insulating glue completely covers the tab.

[0004] Due to the vibration impact in the battery production process, the tab is easily pulled by the insulating glue and stressed to crack, resulting in an increase in the internal resistance of the battery monomer and a decrease in safety. SUMMARY

[0005] In view of the above problems, the present application provides a battery monomer, a battery and a power utilization device, which can alleviate the problem of stress cracking of the tab of the electrode assembly, thereby improving the safety of the battery monomer, the battery and the power utilization device.

[0006] In a first aspect, the present application provides a battery monomer, which comprises:

[0007] an electrode assembly comprising a main body part and a tab protruding from the main body part, the tab having a bonding surface, the bonding surface having a root area, a connecting area and a welding mark area, the root area being connected to the main body part, and the connecting area being connected between the root area and the welding mark area; and

[0008] an insulating glue having a glue coating surface, the glue coating surface having a first glue coating area, a non-glue coating area and a second glue coating area continuously arranged along the width direction of the insulating glue;

[0009] wherein the first glue coating area is bonded to the main body part, the non-glue coating area covers at least one of the root area and the connecting area, and the second glue coating area is bonded to the welding mark area.

[0010] In the present application, the first glue coating area is bonded to the main body part, the second glue coating area is bonded to the welding mark area, and the non-glue coating area covers at least one of the root area and the connecting area. Since the first glue coating area, the non-glue coating area and the second glue coating area are continuously arranged, the insulating glue can completely cover the tab, can fix and hold each tab piece, so as to avoid the tab piece from being stressed and bent and overlapped with the main body part, and reduce the risk of internal short circuit of the electrode assembly.

[0011] In one embodiment, the non-gluing area covers the root area and the connecting area.

[0012] In this way, the root with the root area and the connecting part with the connecting area are not easily torn by the pulling of the insulating glue, so as to ensure that the battery monomer, the battery and the electric device have better safety.

[0013] In one embodiment, the bonding surface further comprises a head area, the head area is arranged on the side of the welding mark area away from the connecting area; and the second gluing area is bonded with the head area.

[0014] By arranging the head area, the bonding area between the insulating glue and the tab is larger, so as to ensure the reliability of the bonding between the tab and the main part. Furthermore, the insulating glue can more reliably support the tab to prevent the tab from being overlapped with the main part, so that the battery has better safety.

[0015] In one embodiment, the main part comprises a first surface provided with the tab, and a second surface in the thickness direction of the electrode assembly, the second surface is located on the same side of the electrode assembly as the bonding surface; and the first gluing area is bonded with the first surface and the second surface.

[0016] The first gluing area is bonded with the first surface and the second surface, compared with the first gluing area directly bonded with the first surface, the bonding area of the first gluing area with the main part is larger, the bonding reliability is better, and the insulating coverage is also wider. In this way, the possibility of the tab being directly or indirectly overlapped with the main part is also better, so that the safety of the battery monomer, the battery and the electric device is also higher.

[0017] In one embodiment, the width of the first gluing area is W1, the width of the first gluing area bonded with the second surface is L1, and 2mm≤W1-L1.

[0018] By arranging the width of the first gluing area bonded with the second surface as L1, and 2mm≤W1-L1, the bonding reliability of the insulating glue and the insulation reliability can be effectively improved, so as to ensure that the battery monomer has better safety.

[0019] In one embodiment, the width of the non-gluing area is W2, the width of the first gluing area bonded with the first surface is L2, the width of the root area is L3, the width of the connecting area is L4, and 0mm

[0020] By arranging 0mmW1+W2-L1-L2-L3-L4≤2mm, in this way, the width of the insulating glue can be ensured to be larger, on the premise of being firmly bonded with the main part, and also has sufficient size to completely cover the root area and the connecting area, so as to better support the tab, and the insulation effect between the tab and the main part can be enhanced.

[0021] In one embodiment, the electrode assembly is two and arranged side by side along the thickness direction of the electrode assembly; the distance between the mutually distal boundary lines of the welding mark area in the two electrode assemblies is L5, and W1+W2+W3

[0022] By setting W1+W2+W3

[0023] In one embodiment, the root area is arranged at an angle with the connecting area, and the angle between the root area and the connecting area is A, which satisfies the condition: A

[0024] By setting A to satisfy the condition: A

[0025] In one embodiment, it further comprises an adapter, which is arranged on the side of the tab away from the bonding surface and connected with the area opposite to the welding mark area.

[0026] By setting the adapter, the tab and the pole can be conveniently electrically connected.

[0027] In a second aspect, the application provides a battery comprising the battery monomer as described in any one of the above embodiments.

[0028] In a third aspect, the application provides a power consuming device comprising the battery for providing electric energy or the battery monomer for providing electric energy.

[0029] The above description is only a summary of the technical solutions of the application. In order to make the technical means of the application more clear, it can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the detailed description of the embodiments below. The drawings are for purposes of illustration only and are not intended to limit the application thereto. Like reference numerals in different drawings denote like elements.

[0031] In the drawings:

[0032] Figure 1 Structure diagram of a vehicle in some embodiments of the application;

[0033] Figure 2 Exploded diagram of a battery in some embodiments of the application;

[0034] Figure 3 Exploded diagram of a battery cell after assembly in some embodiments of the application;

[0035] Figure 4 Structure diagram of the cooperation of the electrode assembly and the adapter, end cover and insulating adhesive when the main body of the electrode assembly is spaced apart on the opposite sides of the adapter in some embodiments of the application;

[0036] Figure 5 Structure diagram of the battery cell shown in the application; Figure 4 Structure diagram of the insulating adhesive shown in the application after bonding with the tab and the adapter;

[0037] Figure 6 Structure diagram of the insulating adhesive shown in the application; Figure 5 Structure diagram of the insulating adhesive shown in the application;

[0038] Figure 7 Structure diagram of the battery cell shown in the application after removing the insulating adhesive; Figure 4

[0039] Structure diagram of the battery cell shown in the application after removing the insulating adhesive; Figure 8 Figure 7 Enlarged diagram of the partial structure B shown in the battery cell.

[0040] Explanation of reference numerals:

[0041] ​1000, vehicle; 100, battery; 200, controller; 300, motor; 10, box body; 11, first part; 12, second part; 20, battery cell; 21, shell; 22, pole post; 221, positive pole post; 222, negative pole post; 23, end cover; 24, electrode assembly; 241, main body part; 2411, first surface; 2412, second surface; 242, tab; 2421, positive tab; 2422, negative tab; 2423, bonding surface; 24231, root area; 24232, connecting area; 24233, welding mark area; 24234, head area; 24235, welding mark; 25, adapter; 251, positive adapter; 252, negative adapter; 26, insulating glue; 261, glue coating surface; 2611, first glue coating area; 2612, non-glue coating area; 2613, second glue coating area. DETAILED DESCRIPTION

[0042] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the spirit of the present application, and that the present application is not limited to the specific embodiments disclosed below.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0044] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0045] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", and "fixedly" should be construed as broad terms, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be the communication between the internal regions of two elements or the interaction relationship between the two elements, unless specifically defined otherwise. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0047] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0048] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0049] The battery includes a battery monomer, the battery monomer is internally provided with an electrode assembly, the electrode assembly includes a main body part and a tab provided on the main body part, and the tab is welded with a switching element or a pole. In the production process, in order to prevent the tab of the electrode assembly from being overlapped with the main body part of the electrode assembly and causing safety accidents due to virtual welding and missing welding after the tab is welded with the switching element or the pole, usually, after welding, an insulating glue is arranged to bond the main body part and the tab, and the insulating glue completely covers the tab.

[0050] The tab includes a plurality of tab pieces stacked together. The virtual welding refers to that the adapter or the pole is welded with only a part of the tab pieces. In this way, the tab pieces not welded are easy to be bent relative to the main body and to be lapped with the main body, resulting in internal short circuit of the electrode assembly. The missing welding refers to that the welding slag produced in the welding process is splashed to other areas outside the area where the adapter or the pole is welded with the tab. After the missing welding, the welding slag may be lapped between the tab and the main body and cause internal short circuit of the electrode assembly.

[0051] By bonding the main body and the tab with the insulating glue after welding, and by covering the tab completely with the insulating glue, each tab piece can be fixed and supported. In this way, in the process of vibration impact, the tab piece can be prevented from being bent and lapped with the main body, and the risk of internal short circuit of the electrode assembly is reduced. In addition, the insulating glue can also lock the welding slag in the area where the adapter or the pole is welded with the tab, so as to prevent the welding slag from splashing and lapping between the tab and the main body. Moreover, even if the welding slag leaks, since the insulating glue completely covers the tab and has an insulating effect, the welding slag can also be prevented from lapping between the tab and the main body, and therefore the risk of internal short circuit of the electrode assembly is further reduced.

[0052] The applicant notices that although the insulating glue alleviates the problem of reduced safety caused by virtual welding and missing welding, since there is vibration impact in the process of battery production, the tab is easy to be cracked under the pulling of the insulating glue, resulting in increased internal resistance of the battery monomer and reduced safety.

[0053] In order to alleviate the problem that the tab is cracked under the pulling of the insulating glue, resulting in increased internal resistance of the battery monomer, the applicant has found, after deep research, a battery monomer. The battery monomer includes an electrode assembly and an insulating glue. The electrode assembly includes a main body and a tab protruding from the main body. The tab has a bonding surface. The bonding surface has a root area, a connecting area and a welding mark area. The root area is connected with the main body. The connecting area is connected between the root area and the welding mark area. The insulating glue has a glue coating surface. The glue coating surface has a first glue coating area, a non-glue coating area and a second glue coating area which are continuously arranged along the width direction of the insulating glue. The first glue coating area is bonded with the main body. The non-glue coating area covers at least one of the root area and the connecting area. The second glue coating area is bonded with the welding mark area.

[0054] The part of the tab with the connecting area is adjacent to the welding mark area. Under the influence of the welding mark area, the mechanical strength of this part is relatively weak and is easy to be cracked under the pulling of the insulating glue. The part of the tab with the root area is connected with the main body. The stress is concentrated at this position and is also easy to be cracked under the pulling of the insulating glue.

[0055] In the battery monomer, by setting the first glue area to be bonded with the main body part, the second glue area to be bonded with the welding mark area, and the non-gluing area to cover at least one of the root area and the connecting area, since the first glue area, the non-gluing area and the second glue area are continuously arranged, the insulating glue can completely cover the tab, and can fix and support each tab piece, so as to avoid the tab piece from being bent and overlapped with the main body part, and reduce the risk of internal short circuit of the electrode assembly. And the insulating glue also has the insulation effect, even if the welding slag leaks, since the insulating glue completely covers the tab, it can also prevent the welding slag from being overlapped between the tab and the main body part, thereby further reducing the risk of internal short circuit of the electrode assembly.

[0056] In addition, the non-gluing area covers at least one of the root area and the connecting area, so that when there is a vibration impact, the root area and / or the connecting area covered by the non-gluing area will no longer be pulled by the insulating glue, thereby preventing the root area and / or the connecting area covered by the non-gluing area from cracking, and thus the safety of the battery monomer is also improved.

[0057] Please refer to Figure 1 The battery 100 disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle 1000, a ship or an aircraft. The power supply system of the electric device can be composed of the battery 100 disclosed in the present application, so that the safety performance of the battery monomer 20 and the battery 100 can be optimized.

[0058] The embodiments of the present application provide an electric device using the battery 100 as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0059] The following embodiments are described with reference to a vehicle 1000 as an example of an electric device of an embodiment of the present application for convenience of description.

[0060] The vehicle 1000 can be a fuel car, a gas car or a new energy car. The new energy car can be a pure electric car, a hybrid car or a range extender car, etc. The vehicle 1000 is internally provided with the battery 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000, for example, the battery 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0061] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0062] Please refer to Figure 2 , the battery 100 includes a box body 10 and a battery cell 20. The box body 10 is used to provide a containing space for the battery cell 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 are covered with each other, and the first part 11 and the second part 12 jointly define a containing cavity for containing the battery 100. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-shaped structure, which is covered on the open side of the second part 12 to jointly define the containing cavity with the second part 12; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 is covered on the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0063] In the battery 100, the battery cell 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells 20 is contained in the box body 10; of course, the battery 100 can also be that the multiple battery cells 20 are first connected in series, in parallel or in a mixed manner to form a battery 100 module, and then the multiple battery 100 modules are connected in series, in parallel or in a mixed manner to form a whole, which is contained in the box body 10. The battery 100 can also include other structures, for example, the battery 100 can also include a current combing component for realizing the electrical connection between the multiple battery cells 20.

[0064] Among them, each battery cell 20 can be a secondary battery 100 or a primary battery 100; it can also be a lithium-sulfur battery 100, a sodium-ion battery 100 or a magnesium-ion battery 100, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.

[0065] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 , the battery cell 20 refers to the smallest unit that constitutes the battery 100. The battery cell 20 includes a shell 21, an end cover 23, an electrode assembly 24, an insulating glue 26 and other energy-providing components.

[0066] The end cover 23 refers to a component that covers the opening of the shell 21 to isolate the internal environment of the battery monomer 20 from the external environment. Without limitation, the shape of the end cover 23 can be adapted to the shape of the shell 21 to fit the shell 21. Alternatively, the end cover 23 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 23 is not easily deformed when subjected to extrusion collision, enabling the battery monomer 20 to have higher structural strength and safety performance. The end cover 23 can be provided with functional components such as the pole 22. The pole 22 can be used to electrically connect with the electrode assembly 24 for outputting or inputting the electrical energy of the battery monomer 20. In some embodiments, the end cover 23 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery monomer 20 when the internal pressure or temperature reaches a threshold value. The material of the end cover 23 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitations on this.

[0067] The shell 21 is a component for fitting the end cover 23 to form the internal environment of the battery monomer 20, wherein the formed internal environment can be used to accommodate the electrode assembly 24, the insulating glue 26, the electrolyte and other components. The shell 21 and the end cover 23 can be independent components, and an opening can be provided on the shell 21, and the end cover 23 is covered on the opening to form the internal environment of the battery monomer 20. Without limitation, the end cover 23 and the shell 21 can also be integrated, specifically, the end cover 23 and the shell 21 can form a common connecting surface before other components enter the shell, and when it is necessary to encapsulate the internal environment of the shell 21, the end cover 23 is covered on the shell 21. The shell 21 can be various shapes and various sizes, such as rectangular parallelepiped, cylinder, hexagonal prism, etc. Specifically, the shape of the shell 21 can be determined according to the specific shape and size of the electrode assembly 24. The material of the shell 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitations on this.

[0068] Please refer to Figure 7 The electrode assembly 24 is a component that undergoes electrochemical reaction in the battery monomer 20. One or more electrode assemblies 24 can be contained in the shell 21. The electrode assembly 24 is mainly formed by winding or layering the positive and negative electrode sheets, and a diaphragm is usually arranged between the positive and negative electrode sheets. The electrode assembly 24 includes a main body part 241 and a tab 242 protruding from the main body part 241, and the tab 242 has an adhesive surface 2423 with a root area 24231, a connecting area 24232 and a welding mark area 24233, the root area 24231 is connected with the main body part 241, and the connecting area 24232 is connected between the root area 24231 and the welding mark area 24233.

[0069] The isolation film, the part of the positive electrode tab having active material, and the part of the negative electrode tab having active material together constitute a main body 241 of the electrode assembly 24, the part of the positive electrode tab not having active material constitutes a positive electrode tab lug, and the part of the negative electrode tab not having active material constitutes a negative electrode tab lug. All the positive electrode tabs are arranged in a stack along the stacking direction of the positive electrode tabs and the negative electrode tabs to form a positive electrode tab lug 2421, and all the negative electrode tabs are arranged in a stack along the stacking direction of the positive electrode tabs and the negative electrode tabs to form a negative electrode tab lug 2422. During the charging and discharging of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab lug 242 is connected to the terminal post 22 to form a current loop.

[0070] The tab lug 242 protrudes from one end of the main body 241 and extends in the protruding direction, and has a root portion, a connecting portion, and a soldering portion arranged in sequence along the extension direction. The root portion is connected to the main body 241, the connecting portion is connected between the root portion and the soldering portion, and the soldering portion is provided with a soldering mark 24235 extending to the opposite boundary lines of the soldering area 24233 along the width direction of the soldering area 24233. The soldering mark 24235 is mainly used to mark the position of the soldering between the tab lug 242 and the adapter 25 or the terminal post 22. The surface of the root portion facing the surface of the insulating adhesive 26 forms a root area 24231, the surface of the connecting portion facing the surface of the insulating adhesive 26 forms a connecting area 24232, and the surface of the soldering portion facing the surface of the insulating adhesive 26 forms a soldering area 24233.

[0071] The root portion is prone to tearing due to the stress concentration at the position where the tab lug 242 is connected to the main body 241. The connecting portion is prone to tearing due to the weak mechanical strength adjacent to the soldering portion.

[0072] The electrode assembly 24 has two tab lugs 242, one of which is a positive tab lug 2421 and the other of which is a negative tab lug 2422. The terminal cover 23 has two terminal posts 22, one of which is a positive terminal post 221 and the other of which is a negative terminal post 222. The positive tab lug 2421 can be directly or through the adapter 25 connected to the positive terminal post 221, and the negative tab lug 2422 can be directly or through the adapter 25 connected to the negative terminal post 222 to form a current loop.

[0073] Please refer again to Figure 6 The insulating adhesive 26 has a coating surface 261 with a first coating area 2611, a non-coating area 2612, and a second coating area 2613 arranged continuously along the width direction of the insulating adhesive 26. The first coating area 2611 is bonded to the main body 241, the non-coating area 2612 covers at least one of the root area 24231 and the connecting area 24232, and the second coating area 2613 is bonded to the soldering area 24233.

[0074] The number of the insulating adhesive 26 is equal to the sum of the number of the positive tab 2421 and the number of the negative tab 2422. Taking the electrode assembly 24 as an example, which is one and includes one positive tab 2421 and one negative tab 2422, the insulating adhesive 26 is two, one of which is a positive insulating adhesive and is used to bond the positive tab 2421 and the main body 241, and the other of which is a negative insulating adhesive and is used to bond the negative tab 2422 and the main body 241. Taking the electrode assembly 24 as an example, which is two and each includes one positive tab 2421 and one negative tab 2422, the insulating adhesive 26 is four, which includes two positive insulating adhesives and two negative insulating adhesives.

[0075] It is worth mentioning that the positive insulating adhesive and the negative insulating adhesive have the same structure, the positive tab 2421 and the negative tab 2422 have the same structure, and the connection relationship between the positive insulating adhesive and the positive tab 2421 and the main body 241 is the same as the connection relationship between the negative insulating adhesive and the negative tab 2422 and the main body 241. The following examples are described by taking the tab 242 as the positive tab 2421 and the insulating adhesive 26 as the positive insulating adhesive as an example.

[0076] In an embodiment, the insulating adhesive 26 includes a substrate and an adhesive layer, wherein the substrate can be made of polyethylene terephthalate (PET), polypropylene (PP) or the like, and the adhesive layer can be made of a pressure-sensitive adhesive layer, a UV adhesive layer or the like. The substrate has a bearing surface for bearing the adhesive layer, and the adhesive layer is coated on the bearing surface and adheres to it.

[0077] In some embodiments, the adhesive layer includes a first adhesive layer and a second adhesive layer, the first adhesive layer and the second adhesive layer are spaced apart along the width direction of the substrate, the first adhesive layer forms a first adhesive coating area 2611 away from the surface of the substrate, the area of the bearing surface not covered by the adhesive layer forms a non-adhesive coating area 2612, the second adhesive layer forms a second adhesive coating area 2613 away from the surface of the substrate, and the first adhesive coating area 2611 is flush with the second adhesive coating area 2613.

[0078] In some embodiments, the thickness of the substrate is K1, which satisfies the condition 0.02 millimeters (mm)≤K1≤0.03 mm.

[0079] In some embodiments, the thickness of the first adhesive layer is K2, which satisfies the condition 0.02 mm≤K2≤0.03 mm.

[0080] In some embodiments, the thickness of the second adhesive layer is K3, which satisfies the condition 0.02 mm≤K2≤0.03 mm.

[0081] In the actual manufacturing process, the two electrode assemblies 24 are first spaced apart on the opposite sides of the end cover 23, and the tab 242 of each electrode assembly 24 is lapped with the corresponding pole 22. Then, a laser welder is arranged towards the bonding surface 2423, and laser is emitted to the welding mark 24235 of each electrode assembly 24 in sequence to weld the tab 242 and the pole 22. Then, the main body part 241 and the tab 242 of each electrode assembly 24 are fixed by using the insulating glue 26. Then, the root part of each electrode assembly 24 is bent relative to the connecting part, so that the main body parts 241 of the two electrode assemblies 24 can be arranged side by side on the inner side of the end cover 23 along the thickness direction X of the electrode assembly 24. Finally, the two electrode assemblies 24 are assembled into the shell 21, and the end cover 23 covers the opening of the shell 21, thereby assembling the battery monomer 20.

[0082] The non-gluing area 2612 covering at least one of the root part area 24231 and the connecting area 24232 includes multiple embodiments. For example, in an embodiment, the non-gluing area 2612 covers the root part area 24231, and the second gluing area 2613 covers the connecting area 24232. In this embodiment, the root part with the root part area 24231 is not easily torn by the pulling of the insulating glue 26 during vibration impact. For another example, in an embodiment, the first gluing area 2611 covers the root part area 24231, and the non-gluing area 2612 covers the connecting area 24232. In this embodiment, the connecting part with the connecting area 24232 is not easily torn by the pulling of the insulating glue 26 during vibration impact. For another example, in an embodiment, the non-gluing area 2612 covers the root part area 24231 and the connecting area 24232. In this embodiment, the root part with the root part area 24231 and the connecting part with the connecting area 24232 are not easily torn by the pulling of the insulating glue 26 during vibration impact.

[0083] In the present application, by arranging the first gluing area 2611 to bond with the main body part 241, the second gluing area 2613 to bond with the welding mark area 24233, and the non-gluing area 2612 to cover at least one of the root part area 24231 and the connecting area 24232, since the first gluing area 2611, the non-gluing area 2612 and the second gluing area 2613 are continuously arranged, the insulating glue 26 can completely cover the tab 242, and can fix and support each tab piece, so as to avoid the tab piece from being bent and lapped with the main body part 241 under stress, thereby reducing the risk of internal short circuit of the electrode assembly 24.

[0084] Moreover, since the second glue coating area 2613 is bonded with the welding mark area 24233, the insulating glue 26 can seal the welding slag at and around the welding mark 24235, so as to weaken the risk of the welding slag splashing and overlapping between the tab 242 and the main body 241. Even if the welding slag leaks, since the insulating glue 26 completely covers the tab 242 and has an insulating effect, the welding slag can also be prevented from overlapping between the tab 242 and the main body 241, so as to further weaken the risk of internal short circuit of the electrode assembly 24.

[0085] In addition, the non-glue coating area 2612 covers at least one of the root area 24231 and the connecting area 24232, so that when there is a vibration impact, the root with the root area 24231 covered by the non-glue coating area 2612 and / or the connecting part with the connecting area 24232 covered by the non-glue coating area 2612 are no longer pulled by the insulating glue 26, so as to prevent the root area 24231 and / or the connecting area 24232 from cracking, so that the safety of the battery monomer 20 is also improved.

[0086] In some embodiments of the present application, the non-glue coating area 2612 covers the root area 24231 and the connecting area 24232.

[0087] In this way, the root with the root area 24231 and the connecting part with the connecting area 24232 are not easily torn by the pulling of the insulating glue 26, so as to ensure that the battery monomer 20, the battery 100 and the electric device have better safety.

[0088] Please refer again to Figure 4 and Figure 7 In some embodiments of the present application, the bonding surface 2423 further comprises a head area 24234, the head area 24234 is arranged on the side of the welding mark area 24233 away from the connecting area 24232; the second glue coating area 2613 is bonded with the head area 24234.

[0089] The tab 242 further has a head, in the extension direction of the tab 242, the head is located downstream of the welding mark part and connected with the welding mark part. The surface of the head facing the insulating glue 26 forms the head area 24234.

[0090] By arranging the head area 24234, the insulating glue 26 has a larger bonding area with the tab 242, so as to make the bonding between the tab 242 and the main body 241 more reliable. Further, the insulating glue 26 can more reliably support the tab 242 to prevent the tab 242 from overlapping with the main body 241, so that the battery 100 has better safety.

[0091] In some embodiments of the present application, the main body 241 comprises a first surface 2411 provided with the tab 242, and a second surface 2412 in the thickness direction X of the electrode assembly 24, the second surface 2412 and the bonding surface 2423 are located on the same side of the electrode assembly 24; the first glue coating area 2611 is bonded with the first surface 2411 and the second surface 2412.

[0092] The second surface 2412 is arranged adjacent to the first surface 2411.

[0093] The first glue coating area 2611 is bonded with the first surface 2411 and the second surface 2412, compared with the first glue coating area 2611 directly bonded with the first surface 2411, the area of the first glue coating area 2611 bonded with the main body 241 is larger, the bonding firmness is better, and the insulation coverage is wider, so that the possibility of the tab 242 directly or indirectly connected with the main body 241 is better, and the safety of the battery monomer 20, the battery 100 and the electric device is higher.

[0094] Please refer to Figure 5 , Figure 6 and Figure 8 In some embodiments of the present application, the width of the first glue coating area 2611 is W1, the width of the first glue coating area 2611 bonded with the second surface 2412 is L1, and 2mm≤W1-L1.

[0095] That is, after the first glue coating area 2611 is bonded with the second surface 2412, there will be a part that can be bonded with the first surface 2411, and the remaining part can ensure that the first glue coating area 2611 can be bonded with the second surface 2412. Due to the manufacturing error of the insulating glue 26 or the operation error of the operator, it is allowed that the first glue coating area 2611 is bonded with the root area 24231, and the width of the part is within the range of the error allowed to exist.

[0096] Therefore, by setting the width of the first glue coating area 2611 bonded with the second surface 2412 as L1, and 2mm≤W1-L1, the bonding firmness and insulation reliability of the insulating glue 26 can be effectively improved, so as to ensure that the battery monomer 20 has better safety.

[0097] In some embodiments of the present application, the width of the non-glue coating area 2612 is W2, the width of the first glue coating area 2611 bonded with the first surface 2411 is L2, the width of the root area 24231 is L3, the width of the connecting area 24232 is L4, and 0mm

[0098] If W1=L1+L2 and W2=L3+L4 are set, due to the error in the glue coating, the width of W1 and W2 in the formed insulation glue 26 can be smaller, which can cause W1 to be unable to adhere to the main body 241, and W2 can also be unable to completely cover the root area 24231 and the connecting area 24232, thereby causing the safety of the battery monomer 20 to be not obviously improved.

[0099] By setting 0mmW1+W2-L1-L2-L3-L4≤2mm, the width of the insulation glue 26 can be ensured to be large, which can be firmly bonded to the main body 241, and also has a sufficient size to completely cover the root area 24231 and the connecting area 24232, thereby helping to better support the tab 242 and being able to enhance the insulation effect between the tab 242 and the main body 241.

[0100] In some embodiments of the present application, the electrode assembly 24 is two and is arranged side by side along the thickness direction X of the electrode assembly 24; the distance between the mutually far boundary lines of the welding mark areas 24233 in the two electrode assemblies 24 is L5, and W1+W2+W3L1+L2+L3+L4+L5.

[0101] Wherein, the connecting area 24232 and the welding mark area 24233 on each tab 242 have a boundary line therebetween, and the distance L5 between the mutually far boundary lines of the welding mark areas 24233 in the two electrode assemblies 24 refers to the distance between the boundary line between the connecting area 24232 and the welding mark area 24233 on the positive tab 2421 in one electrode assembly 24 and the boundary line between the connecting area 24232 and the welding mark area 24233 on the positive tab 2421 in the other electrode assembly 24. The distance L5 between the mutually far boundary lines of the welding mark areas 24233 in the two electrode assemblies 24 also refers to the distance between the boundary line between the connecting area 24232 and the welding mark area 24233 on the negative tab 2422 in one electrode assembly 24 and the boundary line between the connecting area 24232 and the welding mark area 24233 on the negative tab 2422 in the other electrode assembly 24.

[0102] By setting W1+W2+W3L1+L2+L3+L4+L5, the insulating glue 26 adhered to the positive tab 2421 of one of the electrode assemblies 24 can be prevented from extending to the connection area 24232 of the positive tab 2421 of the other electrode assembly 24 and adhering to the connection area 24232, and the insulating glue 26 adhered to the negative tab 2422 of one of the electrode assemblies 24 can be prevented from extending to the connection area 24232 of the negative tab 2422 of the other electrode assembly 24 and adhering to the connection area 24232, so that the connection area 24232 is covered by the non-gluing area 2612, the tab 242 is prevented from being torn by the pulling of the insulating glue 26, and the safety of the battery 100 and the battery cell 20 is improved.

[0103] In an embodiment, the root area 24231 is arranged at an angle with the connection area 24232, and the angle between the root area 24231 and the connection area 24232 is A, which satisfies the condition: A<90°.

[0104] After the welding of the electrode assemblies 24 and the end cover 23 is completed, the root area 24231 can be driven to rotate around the boundary line between the root area 24231 and the connection area 24232 towards the connection area 24232 by bending the root area 24231 relative to the connection area 24232, so that the main body part 241 of the two electrode assemblies 24 can be arranged side by side along the thickness direction X of the electrode assembly 24 on the inner side of the end cover 23.

[0105] By setting A<90°, the root area 24231 can be conveniently rotated relative to the connection area 24232, so that the convenience of assembling the battery cell 20 is improved.

[0106] In some embodiments of the present application, the battery cell 20 further comprises an adapter 25, which is arranged on the side of the tab 242 away from the adhesive surface 2423 and connected to the area opposite the welding mark area 24233.

[0107] Please refer again to Figure 4 , and refer to Figure 8 , the adapter 25 is an electrically conductive component for realizing the electrical connection between the tab 242 and the pole 22. The adapter 25 is arranged in the housing 21 and connected to the area opposite the welding mark area 24233 on the side of the tab 242 away from the adhesive surface 2423. The adapter 25 is located between the side of the tab 242 away from the adhesive surface 2423 and the inner side of the end cover 23 and is welded to the tab 242 and the pole 22 on the end cover 23.

[0108] The adapter 25 is two, one of which is a positive adapter 251 for electrically connecting the positive pole 221 with the positive tab 2421 of all the electrode assemblies 24, and the other is a negative adapter 252 for electrically connecting the negative pole 222 with the negative tab 2422 of all the electrode assemblies 24. The adapter 25 can be made of copper, aluminum or other metal materials with good mechanical properties. It is worth mentioning that the positive adapter 251 and the negative adapter 252 are completely the same in structure, and the connection relationship between the positive adapter 251 and the positive tab 2421 and the main body 241 is also completely the same as that between the negative adapter 252 and the negative tab 2422 and the main body 241. The following examples are described by taking the positive adapter 251 as an example.

[0109] In some embodiments, an insulating member can also be arranged on the inner side of the end cover 23, which can be used to isolate the adapter 25 in the shell 21 from the end cover 23 to reduce the risk of short circuit. For example, the insulating member can be made of plastic, rubber or the like.

[0110] Taking two electrode assemblies 24 and welding the electrode assemblies 24 with the adapter 25 as an example, first, the main bodies 241 of the two electrode assemblies 24 are arranged at opposite sides of the end cover 23, and the tab 242 of each electrode assembly 24 is overlapped with the corresponding adapter 25. Then, a laser welder is arranged towards the bonding surface 2423, and laser is emitted to the welding mark 24235 of each electrode assembly 24 in sequence to weld the tab 242 with the adapter 25. Then, the main body 241, the tab 242 and the adapter 25 in each electrode assembly 24 are fixed by using the insulating glue 26. Next, the adapter 25 is welded with the pole 22 of the end cover 23, so that the two electrode assemblies 24, the adapter 25 and the end cover can form an integral whole. Then, the root of each electrode assembly 24 is bent relative to the connecting portion, so that the main bodies 241 of the two electrode assemblies 24 can be arranged side by side on the inner side of the end cover 23 along the thickness direction X of the electrode assembly 24. Finally, the two electrode assemblies 24 are assembled into the shell 21, and the end cover 23 covers the opening of the shell 21, thereby assembling the battery monomer 20.

[0111] By arranging the adapter 25, the tab 242 and the pole 22 can be conveniently electrically connected.

[0112] In a second aspect, the present application provides a battery 100 comprising the battery monomer 20 according to any one of the above embodiments.

[0113] In a third aspect, the present application provides a power consuming device comprising the battery 100 according to the above embodiments, which is used to provide electric energy, or comprising the battery monomer 20 according to any one of the above embodiments, which is used to provide electric energy.

[0114] According to some embodiments of the present application, the present application provides a battery cell 20, the battery cell 20 comprises an electrode assembly 24 and an insulating adhesive 26, the electrode assembly 24 comprises a main body part 241 and a tab 242 protruding from the main body part 241, the tab 242 has an adhesive surface 2423, the adhesive surface 2423 has a root area 24231, a connecting area 24232 and a welding mark area 24233, the root area 24231 is connected with the main body part 241, the connecting area 24232 is connected between the root area 24231 and the welding mark area 24233, the insulating adhesive 26 has a coating surface 261, the coating surface 261 has a first coating area 2611, a non-coating area 2612 and a second coating area 2613 arranged continuously along the width direction of the insulating adhesive 26. Wherein, the first coating area 2611 is bonded with the main body part 241, the non-coating area 2612 covers the root area 24231 and the connecting area 24232, and the second coating area 2613 is bonded with the welding mark area 24233. In such a battery cell 20, the root with the root area 24231 and the connecting part with the connecting area 24232 are not easy to be torn by the pulling of the insulating adhesive 26, so as to ensure the better safety of the battery cell 20, the battery 100 and the electric device.

[0115] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, The battery cell includes: An electrode assembly includes a main body and a tab protruding from the main body. The tab has an adhesive surface, which has a root region, a connecting region, and a solder area. The root region is connected to the main body, and the connecting region connects the root region and the solder area. An insulating adhesive has a coating surface, which has a first coating area, a non-coating area, and a second coating area continuously arranged along the width direction of the insulating adhesive. The first adhesive application area is bonded to the main body, the non-adhesive application area covers at least one of the root area and the connection area, the second adhesive application area is bonded to the solder area, the bonding surface also includes a head area, the head area is located on the side of the solder area away from the connection area, and the second adhesive application area is bonded to the head area.

2. The battery cell according to claim 1, characterized in that, The non-glued area covers the root zone and the connecting zone.

3. The battery cell according to claim 1, characterized in that, The main body includes a first surface with protruding tabs and a second surface located in the thickness direction of the electrode assembly, the second surface and the adhesive surface being located on the same side of the electrode assembly; The first adhesive area is bonded to the first surface and the second surface.

4. The battery cell according to claim 3, characterized in that, The width of the first adhesive application area is W1, and the width of the first adhesive application area adhering to the second surface is L1, where 2mm ≤ W1 - L1.

5. The battery cell according to claim 4, characterized in that, The width of the non-adhesive area is W2, the width of the first adhesive area that adheres to the first surface is L2, the width of the root area is L3, and the width of the connecting area is L4. 0mm < W1 + W2 - L1 - L2 - L3 - L4 ≤ 2mm.

6. The battery cell according to claim 5, characterized in that, There are two electrode assemblies, which are arranged side by side along the thickness direction of the electrode assembly; The distance between the boundary lines of the solder areas in the two electrode assemblies that are far apart is L5, and W1+W2+W3<L1+L2+L3+L4+L5.

7. The battery cell according to claim 1, characterized in that, The root region and the connecting region are set at an angle, and the angle between the root region and the connecting region is A. A satisfies the condition: A < 90°.

8. The battery cell according to claim 1, characterized in that, It also includes an adapter, which is located on the side of the electrode tab facing away from the bonding surface and connected to the area opposite the solder area.

9. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 8 above.

10. An electrical device, characterized in that, It includes the battery as described in claim 9 above, the battery being used to provide electrical energy, or includes a battery cell as described in any one of claims 1 to 8 above, the battery cell being used to provide electrical energy.

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