Battery and electronic equipment

Abstract

The utility model discloses a battery which comprises a core body which comprises a containing cavity, and the containing cavity extends into the core body from the surface of the core body to the inside along the axial direction; the cover plate is connected with the core body; the connecting piece is in insulated connection with the cover plate, and the upper surface of the connecting piece is used for being connected with external communication equipment; the temperature sensor comprises a connecting end and a detecting end, the connecting end is connected with the lower surface of the connecting piece, and the detecting end is arranged in the containing cavity. According to the utility model, the temperature sensor can be implanted into the battery in the battery assembly process, and the temperature information in the battery can be effectively captured under the condition that the structure of the battery is not damaged. The utility model also provides an electronic device.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of cylindrical lithium battery, especially relates to a battery and electronic equipment. BACKGROUND

[0002] The uncontrolled temperature rise phenomenon caused by the heat chain reaction inside the lithium ion battery can directly cause the battery cell to be in a thermal runaway state, and can further cause catastrophic consequences such as fire and explosion. Therefore, it is particularly important to monitor the potential thermal runaway risk inside the battery cell to reduce its occurrence probability and develop corresponding early warning and prevention measures.

[0003] The current commonly used test scheme is to use indirect data such as battery surface temperature, temperature rise rate, pressure drop and gas production to implement early warning monitoring of thermal runaway behavior. However, due to the limitations of these methods themselves, they can only provide partial information and have limitations, and there is a time lag. This is because the thermal runaway behavior of the battery cell usually originates from the inside of the battery, and from the initial heat accumulation to the process sufficient to cause thermal runaway, heat begins to spread from the inside out. When the external temperature anomaly information is monitored, the thermal runaway may have developed to a degree sufficient to cause a safety accident.

[0004] The existing temperature sensor implantation scheme and related test devices can damage the sealing performance of the cylindrical battery. Usually, when implanting the temperature sensor, the battery shell must be cut open to place the sensor inside the battery cell, and this operation will irreversibly damage the structural components and air tightness of the battery. At the same time, the process of opening the battery will also cause some evaporation and loss of electrolyte, and this series of chain reactions will change the performance of the battery before and after the sensor is implanted.

[0005] In addition, for the subsequent electrical signals or optical signals of the internal temperature sensor of the battery, they need a specific transmission medium, such as a wire or an optical cable. This results in that when the battery is re-packaged, only resin can be used for soft packaging, or a hole design is made on the surface of the shell. However, this design has many disadvantages, on the one hand, it cannot effectively guarantee the pressure consistency inside the battery; on the other hand, the introduction of resin, a highly flammable polymer material, will further increase the risk of thermal runaway of the battery. UTILITY MODEL CONTENTS

[0006] The utility model aims at solving the problem that the existing temperature sensor implantation scheme can damage the sealing performance of the cylindrical battery. The utility model provides a battery and electronic equipment, which implants a temperature sensor inside the battery during the battery assembly process, and can effectively capture the internal temperature information of the battery without damaging the battery structure.

[0007] To solve the above technical problems, the embodiment of the utility model discloses a kind of batteries, the battery includes:

[0008] Core, the core includes accommodating cavity, along axial, the accommodating cavity extends from the surface of the core to inside in the core;

[0009] Cover plate, the cover plate is connected with the core;

[0010] Connecting piece, the connecting piece is insulatedly connected with the cover plate, the upper surface of the connecting piece is used to be connected with the communication equipment of outside world;

[0011] Temperature sensor, the temperature sensor includes connecting end and detection end, the connecting end is connected with the lower surface of the connecting piece, and the detection end is located in the accommodating cavity.

[0012] Using the above technical scheme, battery generally includes current collector, core, battery shell and cover plate, the assembly process of battery is as follows: first, current collector and core are assembled by ultrasonic welding, and current collector, battery shell and cover plate are welded by laser welding at the edge of cover plate.

[0013] And the connecting end of the temperature sensor is connected with the connecting piece in the embodiment of the application, and the connecting piece is insulatedly connected with the cover plate, that is, the integration of the temperature sensor and the cover plate is realized, so that the temperature sensor implantation can be completed when the battery is assembled. Avoid the secondary disassembly to implant temperature sensor after battery assembly in the prior art. This secondary disassembly damage will interfere with the internal structure and chemical environment of the battery, and then affect the subsequent electrochemical performance of the battery, such as may cause the problems of battery charge and discharge efficiency reduction, internal resistance increase, etc. At the same time, it also avoids opening hole on the battery shell or using resin to seal the battery. Opening hole will damage the integrity of the battery shell, affect the pressure balance inside the battery, and also may become a channel for electrolyte leakage or external impurities to enter. On the one hand, resin may react with electrolyte inside the battery, on the other hand, resin as a flammable material may increase the risk of battery thermal runaway in some cases. The present scheme ensures that the internal and external pressure of the battery remains consistent before and after the temperature sensor is introduced, and maintains the stability of the internal environment of the battery.

[0014] Further, the connecting end of the temperature sensor is connected with the connecting piece, and the connecting piece is connected with the communication equipment outside, that is, the temperature sensor can be electrically connected with the communication equipment outside, so that the temperature sensor can monitor the temperature change in the core in real time. Thus, the safety risk of the core in large current fast charging is evaluated, the battery design is guided, and the structure and parameters of the battery are optimized. If the temperature sensor captures abnormal changes in the temperature of the core, the thermal runaway behavior of the core can be warned in advance to gain time for taking corresponding measures and to ensure the safety of the user and the normal operation of the equipment.

[0015] In addition, by insulating connection of the connecting piece and the cover plate, interference of the current of the battery and signal transmission of the temperature sensor is avoided.

[0016] According to another specific embodiment of the present application, the battery comprises an insulating piece, the cover plate comprises a first through hole, the insulating piece comprises a first outer edge and a second through hole, the first through hole is arranged around the first outer edge and connected with the first outer edge, and the connecting piece comprises a second outer edge, the second through hole is arranged around the second outer edge and connected with the second outer edge.

[0017] By arranging the first through hole around the first outer edge and connecting the first through hole with the first outer edge, the cover plate and the insulating piece are just embedded and connected. By arranging the second through hole around the second outer edge and connecting the second through hole with the second outer edge, the insulating piece and the connecting piece are just embedded and connected. By such arrangement, the cover plate and the insulating piece are prevented from overlapping, and the insulating piece and the connecting piece are prevented from overlapping. If the above overlapping occurs at the same time, the cover plate and the connecting piece may be connected by mistake, so that the current of the battery and the signal transmission of the temperature sensor interfere with each other.

[0018] According to another specific embodiment of the present application, the upper surface of the cover plate, the upper surface of the insulating piece and the upper surface of the connecting piece are located in the same plane.

[0019] According to another specific embodiment of the present application, the material of the insulating piece is organic polymer material or inorganic compound.

[0020] By the above technical solution, the insulating piece can be organic polymer material such as polymer or inorganic compound such as ceramic.

[0021] According to another specific embodiment of the present application, the accommodating cavity extends to the center of the core, and the center is located at the half position of the core in the axial direction.

[0022] According to the technical scheme, the thermal runaway behavior of the core body usually originates from the inside of the core body, and from the initial heat accumulation to the process sufficient to cause thermal runaway, heat begins to diffuse from the inside to the outside. Therefore, the accommodation cavity is arranged to extend to the center of the core body, that is, the detection end of the temperature sensor can detect the temperature change at the center of the core body, and the temperature abnormality information can be monitored faster, so that the core body thermal runaway behavior can be warned in advance, and time is gained for taking corresponding measures.

[0023] According to another specific embodiment of the present application, in the radial direction, the cross-sectional area of the temperature sensor accounts for less than or equal to 80% of the cross-sectional area of the accommodation cavity.

[0024] According to the technical scheme, if the cross-sectional area of the temperature sensor accounts for more than 80% of the cross-sectional area of the accommodation cavity, during the assembly process of the battery or during the subsequent use process of the battery, for example, under the condition of slight extrusion from the outside, stress change of internal components due to thermal expansion and contraction, etc., the surrounding components or structures will extrude the temperature sensor. It is possible to extrude the temperature sensor, so that the temperature sensor fails.

[0025] According to another specific embodiment of the present application, the material of the connecting piece is metal, ceramic or plastic.

[0026] According to the technical scheme, when the temperature sensor is an optical fiber temperature sensor, the material of the connecting piece is ceramic, metal or plastic. When the temperature sensor is a thermocouple temperature sensor, the material of the connecting piece is metal, such as copper, platinum, etc.

[0027] According to another specific embodiment of the present application, the battery comprises a current collecting disc and a shell, the upper surface of the current collecting disc is connected with the core body, the cover plate comprises a third outer edge, the current collecting disc comprises an inner wall and an outer wall, the third outer edge is connected with the inner wall, and the outer wall is connected with the inner wall of the shell.

[0028] According to another specific embodiment of the present application, the current collecting disc comprises a third through hole, the detection end sequentially passes through the third through hole and the second through hole, and is arranged in the accommodation cavity.

[0029] The embodiment of the present application also discloses an electronic device, which comprises:

[0030] The battery of any one of the preceding items;

[0031] The communication device is connected with the connecting piece. BRIEF DESCRIPTION OF DRAWINGS

[0032] Fig. 1 A perspective view of the battery according to an embodiment of the present application is shown.

[0033] Fig. 2 An exploded view of the battery according to an embodiment of the present application is shown.

[0034] Fig. 3 An exploded view of the battery according to an embodiment of the present application is shown.

[0035] Legend of reference numerals

[0036] Core 10; accommodating cavity 11; center 12;

[0037] Cover plate 20; first through hole 21;

[0038] Connecting piece 30; second outer edge 31;

[0039] Temperature sensor 40; connecting end 41; detection end 42;

[0040] Insulating piece 50; first outer edge 51; second through hole 52;

[0041] Current collecting plate 60; inner wall 61; outer wall 62; third through hole 63;

[0042] Housing 70. DETAILED DESCRIPTION

[0043] The above description is only used to illustrate the specific embodiments of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. Although the description of the present application is introduced in combination with the preferred embodiments, it does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications which can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0044] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0045] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0046] The terms "first", "second", and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0048] In order to make the purpose, technical scheme and advantages of the utility model more clear, the embodiments of the utility model will be further described in detail below with reference to the drawings.

[0049] Reference Figs. 1-3 The present embodiment provides an electronic device (not shown in the figure), which can be a new energy vehicle, a robot, an electric bicycle, etc., and the electronic device comprises a battery and a communication device (not shown in the figure), wherein the battery can be a lithium battery, a lead-acid battery, a nickel-hydrogen battery, etc., and the communication device can be a computer, a smart phone, a portable data collector, etc. The battery comprises a core body 10, a cover plate 20, a connecting piece 30 and a temperature sensor 40, and the upper surface of the connecting piece 30 is connected with the communication device.

[0050] The core body 10 is a roll core, the core body 10 is in a cylindrical shape, and the core body 10 comprises a containing cavity 11 extending from the surface of the core body 10 to the inside of the core body 10 along the axial direction X. The cover plate 20 is in a circular ring shape, and the cover plate 20 is connected with the core body 10. The connecting piece 30 is circular, and the connecting piece 30 is insulatively connected with the cover plate 20. The temperature sensor 40 comprises a connecting end 41 and a detection end 42, the connecting end 41 is connected with the lower surface of the connecting piece 30, and the detection end 42 is arranged in the containing cavity 11.

[0051] According to the technical scheme, the battery generally comprises a current collecting disc, a core body, a battery shell and a cover plate, and the assembling process of the battery is as follows: firstly, the current collecting disc and the core body are assembled through ultrasonic welding, and the current collecting disc, the battery shell and the cover plate are welded through laser welding at the edge of the cover plate.

[0052] The temperature sensor 40 is integrated with the cover plate 20 by connecting the connecting end 41 of the temperature sensor 40 with the connecting piece 30, and the connecting piece 30 is insulatedly connected with the cover plate 20. Thus, the temperature sensor 40 can be implanted during the assembly of the battery, avoiding the secondary disassembly of the battery after the assembly of the battery to implant the temperature sensor 40 in the prior art. The secondary disassembly may interfere with the internal structure and chemical environment of the battery, and thus affect the subsequent electrochemical performance of the battery, such as reducing the charge-discharge efficiency of the battery and increasing the internal resistance of the battery. Meanwhile, the opening of the battery shell or the sealing of the battery by using resin is also avoided. The opening may damage the integrity of the battery shell, affect the pressure balance of the battery, and may also become a channel for the leakage of electrolyte or the entry of external impurities. The use of resin for sealing may cause chemical reaction between the resin and the electrolyte in the battery, and on the other hand, the resin as a flammable material may increase the risk of thermal runaway of the battery in some cases. The present scheme ensures that the internal and external pressures of the battery remain consistent before and after the introduction of the temperature sensor 40, and maintains the stability of the internal environment of the battery.

[0053] Further, the connecting end 41 of the temperature sensor 40 is connected with the connecting piece 30, and the connecting piece 30 is connected with the communication device, so that the temperature sensor 40 can be electrically connected with the communication device, and the temperature change in the core body 10 can be monitored in real time through the temperature sensor 40. Thus, the safety risk of the core body 10 under high current fast charging can be evaluated, the battery design can be guided, and the structure and parameters of the battery can be optimized. If the temperature sensor 40 captures abnormal changes in the temperature of the core body 10, a warning can be given in advance for the thermal runaway behavior of the core body 10, so as to gain time for taking corresponding measures and ensure the safety of the user and the normal operation of the equipment.

[0054] In addition, the connecting piece 30 is insulatedly connected with the cover plate 20, so as to avoid interference between the current of the battery and the signal transmission of the temperature sensor 40.

[0055] It should be noted that the specific type of the core 10 is not limited in the embodiments of the present application, for example, in other possible embodiments, the core 10 can also be a laminated core, a square block core. The shape of the core 10 is not limited in the embodiments of the present application, for example, in other possible embodiments, the shape of the core 10 can be a cuboid, an irregular body, etc. The shape of the connecting piece 30 is not limited in the embodiments of the present application, for example, in other possible embodiments, the shape of the connecting piece 30 can be an oval, a square, a triangle, etc.

[0056] In some possible embodiments, referring to Figs. 1-3 , the battery comprises an insulating piece 50, the insulating piece 50 is annular, and the cover plate 20 comprises a first through hole 21, the first through hole 21 is circular. The insulating piece 50 comprises a first outer edge 51 and a second through hole 52, the first outer edge 51 is circular, and the second through hole 52 is circular. The first through hole 21 is arranged around the first outer edge 51 and connected with the first outer edge 51. The connecting piece 30 comprises a second outer edge 31, the second outer edge 31 is circular, and the second through hole 52 is arranged around the second outer edge 31 and connected with the second outer edge 31.

[0057] By arranging the first through hole 21 around the first outer edge 51 and connecting the first through hole 21 with the first outer edge 51, that is, the cover plate 20 and the insulating piece 50 are just embedded and connected at this time, and by arranging the second through hole 52 around the second outer edge 31 and connecting the second through hole 52 with the second outer edge 31, that is, the insulating piece 50 and the connecting piece 30 are just embedded and connected at this time. Through such arrangement, it can be avoided that the cover plate 20 and the insulating piece 50 overlap, and the insulating piece 50 and the connecting piece 30 overlap. If the above overlap occurs at the same time, the cover plate 20 and the connecting piece 30 may be accidentally connected, so that the signal transmission of the current and temperature sensor 40 of the battery is interfered.

[0058] It should be noted that the shape of the first through hole 21 is not limited in the embodiments of the present application, for example, in other possible embodiments, the shape of the first through hole 21 can be an oval, a square, a triangle, etc., as long as the shape of the first through hole 21 is the same as that of the first outer edge 51. The shape of the first outer edge 51 is not limited in the embodiments of the present application, for example, in other possible embodiments, the shape of the first outer edge 51 can be an oval, a square, a triangle, etc. The shape of the second through hole 52 is not limited in the embodiments of the present application, for example, in other possible embodiments, the shape of the second through hole 52 can be an oval, a square, a triangle, etc., as long as the shape of the second through hole 52 is the same as that of the second outer edge 31.

[0059] In some possible embodiments, referring to Figs. 1-3The upper surface of the cover plate 20, the upper surface of the insulating member 50 and the upper surface of the connecting member 30 are located in the same plane.

[0060] In some possible implementation manners, the insulating member 50 is made of an organic polymer material or an inorganic compound.

[0061] According to the above technical solution, the insulating member 50 can be made of an organic polymer material such as a polymer or an inorganic compound such as ceramic.

[0062] In some possible implementation manners, referring to Figs. 1-3 The accommodating cavity 11 extends to the center position 12 of the core 10, and the center position 12 is located at a half position of the core 10 in the axial direction X.

[0063] According to the above technical solution, the thermal runaway behavior of the core 10 usually originates from the inside of the core 10, and from the initial heat accumulation to the process sufficient to cause thermal runaway, the heat begins to diffuse from the inside to the outside. Therefore, the accommodating cavity 11 is arranged to extend to the center position 12 of the core 10, that is, the detection end 42 of the temperature sensor 40 can detect the temperature change of the center position 12 of the core 10, and the temperature abnormality information can be monitored more quickly, so that the thermal runaway behavior of the core 10 can be warned in advance, and time is gained for taking corresponding measures.

[0064] In some possible implementation manners, referring to Figs. 1-3 In the radial direction Y, the proportion of the cross-sectional area of the temperature sensor 40 to the cross-sectional area of the accommodating cavity 11 is less than or equal to 80%.

[0065] According to the above technical solution, if the proportion of the cross-sectional area of the temperature sensor 40 to the cross-sectional area of the accommodating cavity 11 is greater than 80%, during the assembly process of the battery or in the subsequent use process of the battery, for example, under the condition of slight extrusion from the outside, stress change of internal components due to thermal expansion and cold contraction and the like, the surrounding components or structures will extrude the temperature sensor 40. It is possible to cause extrusion to the temperature sensor 40, so that the temperature sensor 40 fails.

[0066] It should be noted that the specific value of the proportion of the cross-sectional area of the temperature sensor 40 to the cross-sectional area of the accommodating cavity 11 is not limited in the embodiments of the present application, for example, in other possible implementation manners, the proportion of the cross-sectional area of the temperature sensor 40 to the cross-sectional area of the accommodating cavity 11 can be 50%, 63%, 76%, 80% and the like.

[0067] In some possible implementation manners, the connecting member 30 is made of metal, ceramic or plastic.

[0068] According to the technical scheme, when the temperature sensor 40 is a fiber temperature sensor 40, the material of the connecting piece 30 is ceramic, metal or plastic; and when the temperature sensor 40 is a thermocouple temperature sensor 40, the material of the connecting piece 30 is metal, such as copper, platinum and the like.

[0069] In some possible embodiments, referring to Figs. 1-3 The battery comprises a current collector 60 and a shell 70, the shell 70 is a cylinder, the current collector 60 is connected to the upper surface of the core 10, the cover plate 20 comprises a third outer edge 22, the current collector 60 comprises an inner wall 61 and an outer wall 62, the third outer edge 22 is connected to the inner wall 61, and the outer wall 62 is connected to the inner wall of the shell 70.

[0070] In some possible embodiments, the current collector 60 comprises a third through hole 63, the detection end 42 passes through the third through hole 63 and the second through hole 52 in sequence and is arranged in the accommodating cavity 11.

[0071] Although the utility model has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above content is further detailed description of the utility model in combination with specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and details, including making a number of simple inferences or replacements, without departing from the spirit and scope of the utility model.

Claims

1. A battery, characterized by, The battery comprises: a core body comprising a receiving cavity extending from a surface of the core body to inside the core body in an axial direction; a cover plate connected to the core body; a connecting member insulatedly connected to the cover plate, an upper surface of the connecting member being configured to be connected to a communication device of an external device; a temperature sensor comprising a connecting end and a detecting end, the connecting end being connected to a lower surface of the connecting member, and the detecting end being arranged in the receiving cavity.

2. The battery of claim 1, wherein, The battery comprises an insulating member, the cover plate comprises a first through hole, the insulating member comprises a first outer edge and a second through hole, the first through hole being arranged around the first outer edge and connected to the first outer edge, and the connecting member comprises a second outer edge, the second through hole being arranged around the second outer edge and connected to the second outer edge.

3. The battery of claim 2, wherein the cathode is a lithium cobalt oxide cathode. An upper surface of the cover plate, an upper surface of the insulating member, and an upper surface of the connecting member are located in the same plane.

4. The battery of claim 2, wherein the cathode comprises a lithium metal oxide. The insulating member is made of an organic polymer material or an inorganic compound.

5. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. The receiving cavity extends to a center of the core body, and the center is located at a half position of the core body in the axial direction.

6. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. In a radial direction, a cross-sectional area of the temperature sensor accounts for less than or equal to 80% of a cross-sectional area of the receiving cavity.

7. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. The connecting member is made of metal, ceramic, or plastic.

8. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. The battery comprises a current collecting plate and a shell, the current collecting plate is connected to an upper surface of the core body, the cover plate comprises a third outer edge, the current collecting plate comprises an inner wall and an outer wall, the third outer edge is connected to the inner wall, and the outer wall is connected to an inner wall of the shell.

9. The battery of claim 8, wherein the cathode is a lithium cobalt oxide cathode. The current collecting plate comprises a third through hole, the detecting end passes through the third through hole and the second through hole in sequence and is arranged in the receiving cavity.

10. An electronic device, comprising: The electronic device comprises: the battery according to any one of claims 1 to 9; and a communication device connected to the connecting member.

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