Battery and electric device

Abstract

The utility model relates to a kind of battery and electric equipment, comprising: battery cell, including shell and tab, tab is connected with shell. Encapsulation shell is connected with shell, encapsulation shell is provided with dispensing cavity, dispensing cavity is formed dispensing port and connecting port through the surface of encapsulation shell, dispensing port and connecting port are located at the different side of encapsulation shell, connecting port is set to battery cell;Protective plate is located in encapsulation shell, and is connected with tab;Thermal conductive glue is located in encapsulation shell, thermal conductive glue covers protective plate and tab.The battery of the utility model embodiment's thermal conductive glue does not need mould injection molding, pressure is small, temperature is low, and the damage to protective plate and tab glue is small, and the heat conduction efficiency of thermal conductive glue is high, conducive to protective plate heat dissipation.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery and an electrical device. Background Technology

[0002] In related technologies, a packaging structure is required between the battery cell and the protection circuit. This packaging structure is mainly formed by injection molding of polyurethane or polyamide hot-melt materials. The hot-melt temperature reaches about 200℃, the mold closing pressure is over 4 tons, and the injection pressure reaches 50 MPa. The tab adhesive has a temperature resistance of less than 80℃. Therefore, excessive injection pressure and mold closing pressure may damage the electronic components on the protection circuit. Excessively high adhesive temperature may burn the tab adhesive, leading to battery leakage. In addition, the thermal conductivity of injection molding adhesive is generally weak, less than 2 W / m·K. When the battery requires high-power charging, the heat generated by the protection circuit cannot be dissipated to the cell, resulting in excessively high protection circuit temperature and preventing long-term fast charging. Utility Model Content

[0003] One objective of this utility model is to provide a battery that solves the problems of excessive injection molding pressure and temperature leading to damage to the protection board and tab adhesive, as well as the problem of low heat dissipation efficiency of the protection board in the prior art; the second objective is to provide an electrical device.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A battery includes: a battery cell, comprising a housing and tabs connected to the housing; an encapsulation shell connected to the housing, the encapsulation shell having a dispensing cavity, the dispensing cavity penetrating the surface of the encapsulation shell to form a dispensing port and a connection port, the dispensing port and the connection port being located on different sides of the encapsulation shell, the connection port being disposed facing the battery cell; a protection plate disposed within the encapsulation shell and connected to the tabs; and thermally conductive adhesive disposed within the encapsulation shell, the thermally conductive adhesive covering the protection plate and the tabs.

[0006] According to the above technical means, the encapsulation shell can support and hold the thermally conductive adhesive, preventing external objects from directly contacting the thermally conductive adhesive and thus preventing it from being damaged by external objects. The thermally conductive adhesive can be boron nitride adhesive, which can be injected into the dispensing cavity from the dispensing port using dispensing or spraying methods. The thermal conductivity of the thermally conductive adhesive is greater than or equal to 100W / m·K. The thermally conductive adhesive in the dispensing cavity can contact the shell from the connection port, thereby conducting the high temperature generated by the protection board to the battery cell, greatly increasing the heat dissipation effect of the protection board. In addition, compared with the injection molding method of filling adhesive, the filling method of the thermally conductive adhesive in this embodiment of the utility model has low requirements for equipment and materials. Various adhesive materials such as light-curing adhesive, thermosetting adhesive, and moisture-curing adhesive can be used, only requiring the fluidity of the adhesive, thus allowing for a wider range of adhesive materials to be selected. Furthermore, almost no pressure is generated during the filling of the thermally conductive adhesive, and the thermally conductive adhesive contacts and fuses with the protection board without damaging the components on the protection board, reducing the probability of damage to the protection board.

[0007] Furthermore, the battery also includes: an encapsulation sheet, which is connected to the encapsulation shell and seals the dispensing port.

[0008] The above-mentioned technical means prevent thermal conductive adhesive from overflowing from the dispensing port and prevent external objects or liquids from entering the dispensing cavity through the dispensing port, ensuring the cleanliness of the dispensing cavity, improving battery safety, and extending battery life.

[0009] Furthermore, the dispensing cavity penetrates the surface of the encapsulation shell to form a sealing edge insertion port. The sealing edge insertion port and the connection port are located on the same side of the dispensing cavity, and the sealing edge insertion port and the connection port are spaced apart. The housing has a sealing edge on the side facing the encapsulation shell, and the sealing edge is inserted into the sealing edge insertion port.

[0010] Based on the above technical means, the relative position between the housing and the encapsulation shell can be defined, which helps to improve the connection strength between the housing and the encapsulation shell and avoid relative displacement between the housing and the encapsulation shell.

[0011] Furthermore, the dispensing cavity penetrates the surface of the encapsulation shell to form an opening, which is located at one end of the length direction of the encapsulation shell; the battery also includes a flexible circuit board, which is connected to the protection plate and extends out from the opening.

[0012] According to the above technical means, there will be no interference between the flexible circuit board and the package shell, and the flexible circuit board can be connected to the electrical components on the power equipment.

[0013] Furthermore, the battery also includes a sealing block connected to the encapsulation shell. The sealing block is located between the flexible circuit board and the shell, and blocks the portion of the opening located between the flexible circuit board and the shell.

[0014] Based on the above technical means, the sealing block can prevent glue from overflowing from the opening when the encapsulation shell is filled with glue, reduce the probability of glue leakage, and improve the utilization rate of thermally conductive glue.

[0015] Furthermore, a protrusion is formed on the surface of the packaging shell, the protrusion and the through-hole are located at the same end in the length direction of the packaging shell, and the sealing block is disposed on the protrusion.

[0016] According to the above technical means, by setting the protrusion, it is easier to connect the sealing block and the packaging shell.

[0017] Furthermore, the battery also includes an adhesive strip connected to the encapsulation shell and the housing, the adhesive strip extending along the length direction of the encapsulation shell.

[0018] Based on the above technical means, the relative position between the package shell and the battery cell is fixed, thereby preventing the thermally conductive adhesive from leaking between the package shell and the battery cell when it is injected into the package shell.

[0019] Furthermore, the thermally conductive adhesive includes light-curing adhesive and / or moisture-curing adhesive.

[0020] Based on the above technical means, the curing of thermally conductive adhesive does not require heating. The temperature of the thermally conductive adhesive is low, which will not burn the tab adhesive, avoid leakage of the battery cell, and have little impact on the battery cell, protection board and flexible circuit board, thus reducing the probability of damage to the battery cell, protection board and flexible circuit board.

[0021] Furthermore, the thermally conductive adhesive includes a first adhesive layer and a second adhesive layer, wherein the first adhesive layer is closer to the housing than the second adhesive layer, and the viscosity of the first adhesive layer is greater than the viscosity of the second adhesive layer.

[0022] According to the above technical means, due to the viscosity of the first adhesive layer, the first adhesive layer is not easy to flow, which can prevent the thermally conductive adhesive from leaking from the gap, opening or sealing edge of the shell and the package shell, and reduce the probability of thermally conductive adhesive leakage; by setting the viscosity of the second adhesive layer to be reduced, the second adhesive layer has good fluidity and can fill the space inside the package shell more evenly, avoid the occurrence of glue injection voids, and improve heat dissipation efficiency.

[0023] An electrical device comprising the aforementioned battery.

[0024] Based on the above-mentioned technical means, the electrical equipment of this utility model embodiment, by utilizing the aforementioned battery, can improve heat dissipation efficiency, reduce the probability of damage to the protection package, and improve the reliability of the electrical equipment. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is one of the structural schematic diagrams of the battery in the embodiments of this utility model.

[0027] Figure 2 This is the second schematic diagram of the battery structure in an embodiment of this utility model.

[0028] Figure 3 This is a schematic diagram showing the connection of the battery cell, protection board, and flexible circuit board in an embodiment of this utility model.

[0029] Figure 4 This is a schematic diagram showing the connection between the encapsulation shell, the protective plate, and the flexible circuit board in an embodiment of this utility model.

[0030] Figure 5 This is a schematic diagram of the encapsulation shell and thermally conductive adhesive in an embodiment of this utility model.

[0031] Figure 6 This is one of the structural schematic diagrams of the packaging shell in the embodiments of this utility model.

[0032] Figure 7 This is the second schematic diagram of the encapsulation shell in the embodiments of this utility model.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Battery;

[0035] 100. Battery cell; 110. Housing; 120. Electrode tab; 130. Edge sealing; 140. Electrode tab adhesive;

[0036] 200, Encapsulation shell; 210, Dispensing cavity; 220, Dispensing port; 230, Connection port; 240, Sealing edge insertion port; 250, Through port; 260, Protrusion;

[0037] 300. Protection board;

[0038] 400. Thermal conductive adhesive;

[0039] 500, packaged chip;

[0040] 600, Adhesive strips;

[0041] 700. Flexible circuit board;

[0042] 800, sealing block. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0045] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0046] The following is combined with Figures 1 to 7 The following describes embodiments of the present invention.

[0047] This utility model embodiment proposes a battery 1, which includes a battery cell 100, a package shell 200, a protection plate 300, and thermally conductive adhesive 400.

[0048] The battery cell 100 includes a housing 110 and a tab 120, which is connected to the housing 110. The battery cell 100 can be a pouch battery. The encapsulation shell 200 is connected to the housing 110. The encapsulation shell 200 is provided with a dispensing cavity 210, which penetrates the surface of the encapsulation shell 200 to form a dispensing port 220 and a connection port 230. The dispensing port 220 and the connection port 230 are located on different sides of the encapsulation shell 200, with the connection port 230 facing the battery cell 100.

[0049] The protection board 300 is located inside the package 200 and is connected to the tab 120. The protection board 300 can be soldered onto the tab 120 to control the charging and discharging of the battery cell 100. The protection board 300 can be a PCB (Printed Circuit Board). Thermally conductive adhesive 400 is located inside the package 200 and covers the protection board 300 and the tab 120.

[0050] The encapsulation shell 200 can be a rigid, irregularly shaped plastic shell with a certain structural strength. The encapsulation shell 200 can be 3D printed or molded. The encapsulation shell 200 can support and hold the thermally conductive adhesive 400, prevent external objects from directly contacting the thermally conductive adhesive 400, and prevent the thermally conductive adhesive 400 from being damaged by external objects.

[0051] The thermally conductive adhesive 400 can be boron nitride adhesive. It can be injected into the dispensing cavity 210 from the dispensing port 220 by dispensing or spraying. The thermal conductivity of the thermally conductive adhesive 400 is greater than or equal to 100W / m·K. The thermally conductive adhesive 400 in the dispensing cavity 210 can contact the housing 110 through the connection port 230, thereby conducting the high temperature generated by the protection board 300 to the battery cell 100, which greatly increases the heat dissipation effect of the protection board 300.

[0052] In addition, compared with injection molding, the filling method of thermally conductive adhesive 400 in this embodiment of the invention has lower requirements for equipment and materials. It can use a variety of adhesive materials such as light-curing adhesive, thermosetting adhesive and moisture-curing adhesive. Only the fluidity of the adhesive is required, so a wider range of adhesive materials can be selected. Moreover, the filling of thermally conductive adhesive 400 generates almost no pressure. The thermally conductive adhesive 400 contacts and fuses with the protective plate 300, without damaging the components on the protective plate 300, thus reducing the probability of damage to the protective plate 300.

[0053] Furthermore, such as Figure 1 and Figure 2 As shown, battery 1 also includes a packaging sheet 500, which is connected to the packaging shell 200 and covers the dispensing port 220. The packaging sheet 500 can be formed after dispensing and curing. The packaging sheet 500 is used to cover the dispensing port 220 to prevent the thermally conductive adhesive 400 from overflowing from the dispensing port 220, and to prevent external objects or liquids from entering the dispensing cavity 210 through the dispensing port 220, ensuring the cleanliness of the dispensing cavity 210, improving the safety of battery 1, and extending the service life of battery 1.

[0054] Furthermore, such as Figures 5-7As shown, the dispensing cavity 210 penetrates the surface of the encapsulation shell 200 to form a sealing edge insertion port 240. The sealing edge insertion port 240 and the connection port 230 are located on the same side of the dispensing cavity 210. The housing 110 has a sealing edge 130 on the side facing the encapsulation shell 200, and the sealing edge 130 is inserted into the sealing edge insertion port 240. In this way, the relative position between the housing 110 and the encapsulation shell 200 can be defined, which helps to improve the connection strength between the housing 110 and the encapsulation shell 200 and avoids relative displacement between the housing 110 and the encapsulation shell 200.

[0055] In some embodiments, such as Figure 1 , Figures 3-7 As shown, the dispensing cavity 210 penetrates the surface of the encapsulation shell 200 to form an opening 250, which is located at one end of the encapsulation shell 200 along its length. The battery 1 also includes a flexible circuit board 700, which is connected to the protection plate 300 and extends from the opening. In this way, there is no interference between the flexible circuit board 700 and the encapsulation shell 200, and the flexible circuit board 700 can be connected to electrical components on the electrical device.

[0056] Furthermore, battery 1 also includes a sealing block 800, which is connected to the encapsulation shell 200. The sealing block 800 is located between the flexible circuit board 700 and the shell 110, and seals the portion of the opening 250 located between the flexible circuit board 700 and the shell 110. The sealing block 800 can be an adhesive block formed after dispensing and curing. The sealing block 800 can prevent adhesive from overflowing from the opening 250 during dispensing, reducing the probability of adhesive leakage and improving the utilization rate of the thermally conductive adhesive 400.

[0057] like Figures 4-7 As shown, a protrusion 260 is formed on the surface of the encapsulation shell 200. The protrusion 260 and the through-hole 250 are located at the same end along the length of the encapsulation shell 200, and the sealing block 800 is disposed on the protrusion 260. By providing the protrusion 260, when the sealing block 800 is disposed on the encapsulation shell 200, it is less likely to be interfered with by other structures of the encapsulation shell 200, which is beneficial for connecting the sealing block 800 to the encapsulation shell 200, reducing processing difficulty and improving production efficiency.

[0058] In some embodiments, the thermally conductive adhesive 400 includes a light-curing adhesive and / or a moisture-curing adhesive. The light-curing adhesive can be a UV (Ultraviolet Ray) adhesive, which cures using light. The moisture-curing adhesive cures using the relative humidity of the gas. Neither of these curing methods requires heating. The thermally conductive adhesive 400 has a low temperature, preventing burns to the tab adhesive 140, avoiding leakage from the battery cell 100, and minimizing the impact on the battery cell 100, protection board 300, and flexible circuit board 700, thus reducing the probability of damage to these components.

[0059] In some embodiments, such as Figures 1-4 As shown, battery 1 also includes an adhesive strip 600, which connects to the encapsulation shell 200 and the housing 110. The adhesive strip 600 can extend along the length of the encapsulation shell 200 and can be located on the side of the connection port 230 facing away from the sealing edge insertion port 240. The adhesive strip 600 can be formed by dispensing and curing adhesive. The adhesive strip 600 is used to bond the encapsulation shell 200 and the housing 110, increasing the connection strength between the encapsulation shell 200 and the battery cell 100, improving the positioning reliability between the encapsulation shell 200 and the battery cell 100, and preventing leakage of the thermally conductive adhesive 400 between the encapsulation shell 200 and the battery cell 100 when it is injected into the encapsulation shell 200.

[0060] In some embodiments, the thermally conductive adhesive 400 includes a first adhesive layer and a second adhesive layer. The first adhesive layer is closer to the housing 110 than the second adhesive layer, and the viscosity of the first adhesive layer is greater than that of the second adhesive layer. Due to the viscosity of the first adhesive layer, it is less prone to flow, which can prevent the thermally conductive adhesive 400 from leaking from the gap between the housing 110 and the encapsulation shell 200, the opening 250, or the sealing edge insertion 240, thereby reducing the probability of leakage of the thermally conductive adhesive 400. By setting the viscosity of the second adhesive layer to be reduced, the second adhesive layer has good flowability and can fill the space inside the encapsulation shell 200 more evenly, avoiding the formation of injection voids and improving heat dissipation efficiency.

[0061] The viscosity of both the first and second adhesive layers is controlled between 3000 cps and 6000 cps. If the viscosity is greater than 6000 cps, the thermally conductive adhesive 400 will not flow easily within the encapsulation shell 200, potentially leading to voids in the filling. If the viscosity is less than 3000 cps, the surface tension of the thermally conductive adhesive 400 will be too low, making it prone to seepage through gaps. Controlling the viscosity between 3000 cps and 6000 cps ensures both uniform adhesive filling and reduces the probability of seepage.

[0062] In other embodiments, the viscosity of the first adhesive layer and the second adhesive layer may be the same, but the curing methods of the first adhesive layer and the second adhesive layer may be different, which can also achieve the purpose of reducing adhesive leakage.

[0063] Of course, the viscosity and curing method of the first and second adhesive layers can be different, which can more effectively reduce adhesive leakage.

[0064] This utility model embodiment also proposes an electrical device, which includes the aforementioned battery 1. The electrical device can be a mobile terminal such as a mobile phone or computer, or it can be a vehicle or other equipment.

[0065] The electrical equipment of this utility model embodiment, by using the battery 1 described above, can improve heat dissipation efficiency, reduce the probability of damage to the protection pack, and improve the reliability of the electrical equipment.

[0066] The assembly process of battery 1 is illustrated below with reference to the accompanying drawings:

[0067] First, the protection board 300 and the tab 120 of the battery cell 100 are soldered together. The protection board 300 is then placed into the dispensing cavity 210 through the connection port 230. The sealing edge 130 of the battery cell 100 is inserted into the sealing edge insertion port 240. The flexible circuit board 700 extends out of the package shell 200 from the through port 250.

[0068] Then, thermally conductive adhesive 400 is poured into the dispensing cavity 210 through the dispensing port 220. The dispensing port 220 and the through port 250 can be the two opposite ends of the encapsulation shell 200 along its length. During dispensing, the end with the dispensing port 220 is located at the top, and the end with the through port 250 is located at the bottom. The thermally conductive adhesive 400 can be boron nitride thermally conductive adhesive 400, so that the thermally conductive adhesive 400 covers the protective plate 300. The distance between the thermally conductive adhesive 400 and the upper surface of the dispensing cavity 210 can be greater than 0.5 mm. After standing for 3 min to 5 min, the thermally conductive adhesive 400 flows and levels.

[0069] Next, apply UV-curable adhesive at the 220mm dispensing nozzle, and then irradiate the adhesive with a UV-curing lamp. The energy of the UV-curing lamp can be 200MW / cm². 2 The irradiation time of the UV curing lamp can be 3s to 5s to allow the UV curing adhesive to cure and solidify to form an encapsulation sheet 500. The UV curing adhesive can be a UV adhesive. The encapsulation sheet 500 covers the dispensing nozzle 220. The thickness of the encapsulation sheet 500 is controlled between 0.3mm and 0.5mm.

[0070] Finally, adhesive strip 600 is formed by applying adhesive to the encapsulation shell 200. The adhesive strip 600 connects the housing 110 of the battery cell 100 with the encapsulation shell 200, fixing the relative positions of the housing 110 of the battery cell 100 and the encapsulation shell 200.

[0071] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.

[0072] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: A battery cell (100) includes a housing (110) and a tab (120) connected to the housing (110); A packaging shell (200) is connected to the housing (110). The packaging shell (200) is provided with a dispensing cavity (210). The dispensing cavity (210) penetrates the surface of the packaging shell (200) to form a dispensing port (220) and a connection port (230). The dispensing port (220) and the connection port (230) are located on different sides of the packaging shell (200). The connection port (230) is oriented towards the battery cell (100). A protective plate (300) is disposed inside the encapsulation shell (200) and connected to the electrode tab (120); Thermally conductive adhesive (400) is disposed inside the encapsulation shell (200), and the thermally conductive adhesive (400) covers the protective plate (300) and the tab (120).

2. The battery according to claim 1, characterized in that, Also includes: The encapsulation sheet (500) is connected to the encapsulation shell (200) and covers the dispensing port (220).

3. The battery according to claim 1, characterized in that, The dispensing cavity (210) penetrates the surface of the encapsulation shell (200) to form a sealing insert (240). The sealing insert (240) and the connection port (230) are located on the same side of the dispensing cavity (210), and the sealing insert (240) and the connection port (230) are spaced apart. The housing (110) has a sealing edge (130) on the side facing the encapsulation housing (200), and the sealing edge (130) is inserted into the sealing edge socket (240).

4. The battery according to claim 1, characterized in that, The dispensing cavity (210) penetrates the surface of the encapsulation shell (200) to form a through-hole (250), and the through-hole (250) is located at one end of the encapsulation shell (200) along its length. The battery (1) also includes a flexible circuit board (700) connected to the protection plate (300), and the flexible circuit board (700) extends from the port (250).

5. The battery according to claim 4, characterized in that, The battery (1) further includes a sealing block (800), which is connected to the encapsulation shell (200). The sealing block (800) is located between the flexible circuit board (700) and the shell (110), and the sealing block (800) blocks the portion of the opening (250) located between the flexible circuit board (700) and the shell (110).

6. The battery according to claim 5, characterized in that, The surface of the encapsulation shell (200) has a protrusion (260), the protrusion (260) and the through-hole (250) are located at the same end of the encapsulation shell (200) in the length direction, and the sealing block (800) is provided on the protrusion (260).

7. The battery according to any one of claims 1-6, characterized in that, Also includes: An adhesive strip (600) is connected to the encapsulation shell (200) and the housing (110), and the adhesive strip (600) extends along the length direction of the encapsulation shell (200).

8. The battery according to any one of claims 1-6, characterized in that, The thermally conductive adhesive (400) includes light-curing adhesive and / or moisture-curing adhesive.

9. The battery according to any one of claims 1-6, characterized in that, The thermally conductive adhesive (400) includes a first adhesive layer and a second adhesive layer, wherein the first adhesive layer is closer to the housing (110) than the second adhesive layer, and the viscosity of the first adhesive layer is greater than the viscosity of the second adhesive layer.

10. An electrical appliance, characterized in that, The battery (1) includes any one of claims 1-9.

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