Battery cells, batteries and electrical devices

Abstract

A battery cell, a battery and an electrical device. The battery cell comprises: a shell having a accommodating cavity, and the shell is provided with a through hole, the through hole passes through the wall of the shell and is connected with the accommodating cavity; a sealing member sealing the through hole; a temperature detection member at least partially embedded in the sealing member, and the portion embedded in the sealing member is used to collect the temperature in the accommodating cavity. In the above technical scheme, the through hole of the shell is sealed by the sealing member, and the temperature in the accommodating cavity is detected by the portion of the temperature detection member embedded in the sealing member, which can reduce the energy loss of the heat in the accommodating cavity to the temperature detection member. The detection result of the temperature detection member is closer to the actual temperature inside the battery cell, which improves the temperature collection accuracy and prolongs the time for personnel to handle or escape when the temperature inside the battery cell is abnormal.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery and an electrical device. Background Art

[0002] The battery cells in the battery need to be in a certain temperature range during operation. When the temperature exceeds or falls below this range, the stability and performance of the battery cells will be greatly affected. Therefore, detecting the temperature of the battery cells is of great significance for temperature control. However, in the related art, the temperature of the battery cells is collected by sampling components, and the temperature detection accuracy is low, which affects the timeliness of temperature anomaly handling and personnel escape. Utility Model Content

[0003] The embodiments of the utility model provide a battery cell, a battery and an electrical device, which improve the temperature detection accuracy of the battery cell and extend the time for personnel to handle and escape when the temperature is abnormal.

[0004] In a first aspect, an embodiment of the utility model provides a battery cell, comprising: a shell having a accommodating cavity, and the shell is provided with a through hole, the through hole passes through the wall of the shell and is connected with the accommodating cavity; a sealing member, sealing the through hole; a temperature detection member, at least partially embedded in the sealing member, and the portion embedded in the sealing member is used to collect the temperature in the accommodating cavity.

[0005] In the above technical solution, the through hole of the shell is sealed by a sealing member, and the temperature in the accommodating cavity is detected by a temperature detecting member embedded in the sealing component. This can reduce the energy loss of heat in the accommodating cavity transferred to the temperature detecting member. The detection result of the temperature detecting member is closer to the actual temperature inside the battery cell, thereby improving the temperature collection accuracy and extending the time for personnel to handle or escape when the temperature inside the battery cell is abnormal.

[0006] In some embodiments, the temperature detection component includes a temperature sensor and a lead wire, the temperature sensor is embedded in the sealing component, and the lead wire is electrically connected to the temperature sensor and extends outside the housing.

[0007] In the above technical solution, the temperature information is transmitted through the lead wire, so that the time difference between temperature collection and transmission is smaller, thereby improving the timeliness of abnormal temperature reminders, and the structure of the temperature detection element is simpler and less prone to damage or failure.

[0008] In some embodiments, the sealing member is provided with a recess, and the temperature sensor is located in the recess and connected to the inner surface of the recess by adhesive.

[0009] In the above technical solution, the temperature sensor and the inner surface of the recess are connected by adhesive, so that the stability of the temperature sensor fixation can be improved, and the temperature sensor is not easily separated from the seal to affect the temperature detection result; the adhesive can also protect and fix the temperature sensor and the connection between the temperature sensor and the lead wire to improve the connection reliability between the temperature sensor and the lead wire and achieve a good waterproof effect.

[0010] In some embodiments, the lead wire includes a first wire segment and a second wire segment, the first wire segment connects the temperature sensor and the second wire segment, and the second wire segment extends outside the shell, wherein the first wire segment is a single-strand wire, the second wire segment is a multi-strand wire, and the adhesive wraps the temperature sensor, the first wire segment, and the connection between the first wire segment and the second wire segment.

[0011] In the above technical solution, the multi-strand wires and the temperature sensor are connected by a single-strand wire, and there is no gap in the single-strand wire itself and it is not easy to form a gap between the single-strand wire and the adhesive. Even if the external water vapor flows along the gap of the multi-strand wire to the single-strand wire, it cannot flow further to the temperature sensor, thereby improving the blocking effect of the adhesive on the external water vapor and reducing the risk of water ingress damage to the temperature sensor. In addition, the adhesive wraps the temperature sensor, the first line segment, and the connection between the first line segment and the second line segment, so that the adhesive can protect the connection between the temperature sensor and the first line segment, and the connection between the first line segment and the second line segment, thereby improving the reliability of the electrical connection.

[0012] In some embodiments, the recess is a groove, and a notch of the groove faces outside the shell.

[0013] In the above technical solution, the temperature sensor and adhesive located in the groove do not contact the electrolyte in the accommodating cavity, thereby preventing the temperature sensor and adhesive from being corroded by the electrolyte, reducing the requirements for the corrosion resistance of the temperature sensor and adhesive, and helping to improve the reliability of the seal of the seal at the through hole.

[0014] In some embodiments, the adhesive is a thermally conductive adhesive.

[0015] In the above technical solution, the thermally conductive adhesive has good thermal conductivity, which can improve the thermal conductivity efficiency between the seal and the temperature sensor and improve the timeliness of temperature anomaly detection.

[0016] In some embodiments, at least a portion of the seal is located within the receiving cavity.

[0017] In the above technical solution, by locating at least part of the seal in the accommodating cavity, the effect of heat transfer from the accommodating cavity to the seal can be improved, the energy loss of heat transfer can be reduced, and the temperature of the seal can be made closer to the actual temperature in the accommodating cavity. Then, the detection result of the temperature detection element can be closer to the actual temperature in the accommodating cavity, thereby further improving the temperature detection accuracy.

[0018] In some embodiments, the sealing member is disposed through the through hole, and at least a portion of the temperature detecting member is located in the through hole.

[0019] In the above technical solution, at least a part of the temperature detection element is located in the through hole, so as to reduce the distance between the temperature detection element and the accommodating cavity and improve the detection accuracy of the temperature detection element.

[0020] In some embodiments, at least a portion of the temperature detection component is located in the accommodating cavity.

[0021] In the above technical solution, by extending the temperature detection element into the accommodating cavity, the distance between the temperature detection element and the accommodating cavity can be further reduced, and the detection accuracy of the temperature detection element can be further improved.

[0022] In some embodiments, a wall surface of the shell is provided with a first pole and a second pole spaced apart in a set direction, and the through hole is located between the first pole and the second pole.

[0023] In the above technical solution, the first pole and the second pole are connected to the electrode assembly in the shell. For the electrode assembly, the temperature of the area between the first pole and the second pole is higher than that of other areas. By providing a through hole between the first pole and the second pole, the temperature detection element can detect the temperature of the area between the first pole and the second pole of the electrode assembly, which is more conducive to timely response when the temperature is abnormal.

[0024] In some embodiments, the seal comprises a metal member.

[0025] In the above technical solution, the metal material has good corrosion resistance and high strength, which is conducive to improving the sealing reliability of the seal on the through hole, thereby improving the sealing of the battery cell, and reducing the risk of contact between the temperature sensor and the electrolyte, thereby increasing the service life of the temperature sensor.

[0026] In some embodiments, the shell includes an outer shell and a cover body, the cover body covers the end opening of the outer shell to cooperate with the outer shell to define the accommodating cavity, and the outer shell or the cover body has the through hole.

[0027] In the above technical solutions, after the sealing member seals the through hole and the temperature detecting member is at least partially embedded in the sealing member, the accuracy of the temperature detecting member in detecting the temperature in the accommodating cavity can be improved.

[0028] In some embodiments, the through hole is a liquid injection hole.

[0029] In the above technical solution, the through hole can be used to inject electrolyte into the shell during the production process, and can also be used to install a temperature sensor to detect the temperature in the accommodating cavity, which can reduce the number of holes on the shell to simplify the structure.

[0030] In a second aspect, an embodiment of the present invention further provides a battery, comprising the above-mentioned battery cell.

[0031] In some embodiments, there are a plurality of battery cells, and the battery further includes a sampling plate, and the temperature detection components of the plurality of battery cells are communicatively connected to the sampling plate.

[0032] In the above technical solution, the temperature detection components of multiple battery cells are communicatively connected to the sampling board, so that the sampling board can collect the temperatures of multiple battery cells and monitor the temperatures of multiple battery cells. The functional integration can simplify the structure and facilitate connection with the external transmission structure.

[0033] In some embodiments, the sampling plate is provided with a through hole, and the lead wire of the temperature detection element is passed through the through hole, and a portion of the lead wire located on a side of the sampling plate facing away from the shell is electrically connected to the sampling plate.

[0034] In the above technical solution, by setting a through hole on the sampling plate, the connection end of the lead wire used to connect to the sampling plate can be passed through the side of the sampling plate facing away from the shell, so that the connection structure between the lead wire and the sampling plate is not easily blocked by the sampling plate and the shell, which facilitates the connection operation between the lead wire and the sampling plate, such as facilitating welding or crimping the connection end of the lead wire to the sampling plate.

[0035] In a third aspect, an embodiment of the utility model further provides an electrical device, comprising the above-mentioned battery, wherein the battery is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of a vehicle provided by an embodiment of the utility model;

[0037] Figure 2 An exploded view of a battery provided in an embodiment of the utility model;

[0038] Figure 3 An exploded view of a battery cell provided in an embodiment of the utility model;

[0039] Figure 4 and Figure 5 A schematic diagram of the structure of a battery cell from different viewing angles provided by an embodiment of the utility model;

[0040] Figure 6 for Figure 5 A cross-sectional view along the direction indicated by line AA;

[0041] Figure 7 for Figure 6 The middle circle shows the enlarged structural schematic diagram of B;

[0042] Figure 8 and Fig. 9 A schematic diagram of the structure of the sealing member and the temperature detection member provided by the embodiment of the utility model from different viewing angles;

[0043] Fig.10 for Fig. 9 A cross-sectional view along the CC line;

[0044] Fig.11 for Fig.10 The middle circle shows the enlarged structural schematic diagram of D;

[0045] Fig.12 A schematic diagram of the matching structure of a battery cell and a sampling plate provided in an embodiment of the utility model.

[0046] Reference numerals:

[0047] Vehicle 1; battery 1000; controller 2000; motor 3000;

[0048] Sampling plate 200; through hole 210; box assembly 300; box body 310; box cover 320;

[0049] Battery cell 100;

[0050] Shell 10; accommodating cavity 101; through hole 102; outer shell 11; cover 12;

[0051] Sealing member 20; recess 21; adhesive 22;

[0052] Temperature detection element 30; temperature sensor 31; lead wire 32; first line segment 321; second line segment 322;

[0053] Electrode assembly 40; first pole 41; second pole 42;

[0054] The first direction F1; the second direction F2; the third direction F3. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0056] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those generally understood by technicians in the technical field of the present invention; the terms used in the present invention and in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0057] The reference to "embodiment" in the present invention means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", and "attachment" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] The term "and / or" in the present invention is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0060] In the embodiments of the present invention, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present invention shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present invention.

[0061] The term "plurality" used in the present invention refers to more than two (including two).

[0062] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0063] It is understandable that the battery cells in the battery need to be in a certain temperature range during operation. However, during the charging and discharging process of the battery cells or under the influence of the ambient temperature, the temperature of the battery cells will change. For example, the battery cells release heat during the charging and discharging process. When the heat release is too large and the temperature is abnormal, there is a risk of fire. Therefore, detecting the temperature of the battery cells is of great significance for temperature control.

[0064] In the related art, the temperature of the battery cell is collected through a sampling assembly. Specifically, the sampling assembly is connected to the battery cell through a bar, and the temperature of the battery cell is transmitted to the bar through the shell of the battery cell, and then transmitted to the sampling assembly through the bar to complete the temperature sampling. During the temperature transmission process, there is energy loss, and the actual temperature inside the battery cell cannot be accurately monitored, which reduces the timeliness of personnel handling or escape when the temperature is abnormal.

[0065] Based on this, the present application proposes a battery cell, comprising a shell, a seal and a temperature detector. The shell has a receiving cavity, and the shell is provided with a through hole, which passes through the wall of the shell and is connected to the receiving cavity. The seal seals the through hole, and the temperature detector is at least partially embedded in the seal, and the portion embedded in the seal is used to collect the temperature in the receiving cavity.

[0066] In the battery cell of the above structure, the temperature in the accommodating cavity is collected by the temperature detection component, which can reduce the energy loss in the temperature transfer process, thereby improving the accuracy of temperature detection, so that personnel can deal with it in time or extend the escape time when the temperature is abnormal.

[0067] The battery cell disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0068] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0069] Reference Figure 1 , Figure 1 A schematic diagram of a vehicle 1 provided for some embodiments of the present application. Vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1000 is provided inside the vehicle 1, and the battery 1000 may be provided at the bottom, head or tail of the vehicle 1. The battery 1000 may be used to power the vehicle 1, for example, the battery 1000 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 2000 and a motor 3000, and the controller 2000 is used to control the battery 1000 to power the motor 3000, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0070] In some embodiments of the present application, the battery 1000 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0071] Reference Figure 2 , Figure 2 This is an exploded view of a battery 1000 according to some embodiments of the present application. The battery 1000 includes a box assembly 300 and a battery cell 100 . The box assembly 300 has a receiving cavity 101 . The battery cell 100 is received in the receiving cavity 101 of the box assembly 300 .

[0072] Among them, the box assembly 300 is used to provide a storage space for the battery cell 100, and the box assembly 300 can adopt a variety of structures. In some embodiments, the box assembly 300 may include a first part (such as a box body 310) and a second part (such as a box cover 320), the first part and the second part cover each other, and the first part and the second part jointly define a storage space for accommodating the battery cell 100. The second part can be a hollow structure with an opening at one end, and the first part can be a plate-like structure. The first part covers the open side of the second part, so that the first part and the second part jointly define a storage space; the first part and the second part can also be hollow structures with an opening on one side, and the open side of the first part covers the open side of the second part. Of course, the box assembly 300 formed by the first part and the second part can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0073] In the battery 1000, there may be multiple battery cells 100, and the multiple battery cells 100 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 100 are both connected in series and in parallel. The multiple battery cells 100 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 100 is accommodated in the box assembly 300; of course, the battery 1000 may also be a battery module formed by connecting multiple battery cells 100 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box assembly 300. The battery 1000 may also include other structures, for example, the battery 1000 may also include a busbar component for realizing electrical connection between the multiple battery cells 100.

[0074] The battery cell 100 may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., which is not limited in the embodiment of the present invention. The battery cell 100 may be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiment of the present invention. The battery cell 100 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which is not limited in the embodiment of the present invention.

[0075] For example, the battery cell 100 may include a housing 10, an electrode assembly 40 and an electrolyte, and the housing 10 is used to accommodate the electrode assembly 40 and the electrolyte. The electrode assembly 40 is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell 100 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The battery cell 100 may be provided with a pole or the like connected to the pole ear as an electrical connection part of the battery cell 100. In addition, the battery cell 100 may have a pressure relief part. When the internal pressure of the battery cell 100 is too large (for example, thermal runaway), the pressure relief part is used to release the internal substances of the battery cell 100 (for example, gas, liquid, particulate matter, etc.) to reduce the internal pressure of the battery cell 100, and avoid the internal pressure of the battery cell 100 being too quickly pressurized, which may cause dangerous accidents such as explosion of the battery cell 100. For example, the pressure relief part may be an explosion-proof valve, an explosion-proof plate, and the like.

[0076] Hereinafter, a battery cell 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0077] Please refer to Figure 3-Figure 7 , Figure 3 An exploded view of a battery cell 100 provided in an embodiment of the present utility model; Figure 4 and Figure 5 A schematic diagram of the structure of a battery cell 100 from different viewing angles provided by an embodiment of the utility model; Figure 6 for Figure 5 A cross-sectional view along the direction indicated by line AA; Figure 7 for Figure 6 The enlarged structural diagram of the B is circled in the middle. The battery cell 100 includes: a housing 10, a sealing member 20 and a temperature detection member 30. The housing 10 has a receiving cavity 101, and the housing 10 is provided with a through hole 102, which passes through the wall of the housing 10 and is connected to the receiving cavity 101. The sealing member 20 seals the through hole 102. The temperature detection member 30 is at least partially embedded in the sealing member 20, and the portion embedded in the sealing member 20 is used to collect the temperature in the receiving cavity 101.

[0078] like Figure 3 and Figure 4 As shown, the accommodating cavity 101 of the shell 10 is used to accommodate the electrode assembly 40 and the electrolyte, so that the electrode assembly 40 can be charged and discharged normally.

[0079] In some embodiments, Figure 3 and Figure 4As shown, the housing 10 may include a shell 11 and a cover 12, and the cover 12 covers the end opening of the shell 11, so that the cover 12 cooperates with the shell 11 to define the accommodating cavity 101. For example, the shell 11 forms an end opening at one end along the first direction F1 and is closed at the other end, and there is one cover 12 that covers the end opening of the shell 11; for another example, the shell 11 forms end openings at both ends along the first direction F1, and there are two covers 12 that respectively cover the two end openings of the shell 10.

[0080] The housing 11 and the cover 12 are separately processed and assembled together, so that the housing 10 is formed into an assembled structure, which is convenient for assembling components such as the electrode assembly 40 in the accommodating cavity 101. In addition, the housing 11 is provided with a through hole 102, or the cover 12 is provided with a through hole 102, which can improve the accuracy of the temperature detection member 30 in detecting the temperature in the accommodating cavity 101 after the sealing member 20 seals the through hole 102 and the temperature detection member 30 is at least partially embedded in the sealing member 30, and the through hole 102 is flexibly arranged.

[0081] The through hole 102 passes through the wall of the shell 10, where the wall can be the cover body 12, the end wall of the other end of the shell 11 along the first direction F1, the side walls of the shell 11 on both sides of the second direction F2, or the side walls of the shell 11 on both sides of the third direction F3. The first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other.

[0082] Taking the through hole 102 provided in the cover body 12 as an example, the through hole 102 passing through the cover body 12 means that the openings at both ends of the through hole 102 are respectively formed on the surface of the cover body 12 facing the accommodating cavity 101 and the surface of the cover body 12 facing away from the accommodating cavity 101. The through hole 102 opens from one end to the other end and can extend along any shape such as a straight line or an arc. Moreover, the cross section of the through hole 102 perpendicular to the extension direction can be any shape such as a circle, a square, a triangle, etc.; the shape and size of the through hole 102 at different cross sections can be the same or different, which is within the protection scope of the present utility model.

[0083] The seal 20 seals the through hole 102. The seal 20 may be at least partially located in the through hole 102 to seal the through hole 102. The seal 20 may also cover the opening of at least one end of the through hole 102 to seal the through hole 102. The seal 20 and the wall surface provided with the through hole 102 may be welded and sealed, or interference sealed, etc. In addition, the seal 20 and the wall surface provided with the through hole 102 may be fixedly connected or detachably connected.

[0084] The temperature detection component 30 refers to a component capable of detecting temperature. For example, the temperature detection component 30 may include a temperature sensor 31, and the temperature sensor 31 is used to detect temperature.

[0085] like Figure 6 and Figure 7As shown, the temperature detection member 30 is at least partially embedded in the sealing member 20, and the portion embedded in the sealing member 20 is used to collect the temperature in the accommodating cavity 101. Here, the portion of the temperature detection member 30 embedded in the sealing member 20 (hereinafter referred to as the embedded portion) can pass through the sealing member 20 to directly contact the electrode assembly 40 or the electrolyte in the accommodating cavity 101, so as to directly detect the temperature in the accommodating cavity 101 and improve the accuracy of the detection.

[0086] The embedded part can also indirectly detect the temperature in the accommodating cavity 101 through the seal 20. Since the through hole 102 is connected to the accommodating cavity 101, and the seal 20 seals the through hole 102, the electrode assembly 40 in the accommodating cavity 101 is directly in contact with the seal 20 to transfer heat to the seal 20, or the electrolyte in the accommodating cavity 101 can contact the seal 20 to transfer the heat of the electrode assembly 40 to the seal 20. The embedded part can fully transfer heat with the seal 20, and the seal 20 transfers heat to the embedded part to achieve indirect temperature detection. The embedded structure makes it difficult for the heat of the seal 20 to be lost to the outside, thereby reducing energy loss.

[0087] In the above embodiment, the through hole 102 of the shell 10 is sealed by the sealing member 20, and the temperature in the accommodating cavity 101 is detected by the temperature detecting member 30 embedded in the sealing component. This can reduce the energy loss of heat in the accommodating cavity 101 transferred to the temperature detecting member 30. The detection result of the temperature detecting member 30 is closer to the actual temperature inside the battery cell 100, which improves the temperature collection accuracy and prolongs the time for personnel to handle or escape when the temperature inside the battery cell 100 is abnormal.

[0088] In the embodiment of the present application, after the temperature detection element 30 detects the temperature of the accommodating cavity 101, the detection result can be transmitted to the sampling plate 200 and other structures through wireless communication, or the detection result can be transmitted through electrical connection of wires.

[0089] For example, in some embodiments, Figure 7-Figure 9 As shown, Figure 8 and Fig. 9 The schematic diagram of the structure of the sealing member 20 and the temperature detection member 30 provided by the embodiment of the utility model from different perspectives. The temperature detection member 30 includes a temperature sensor 31 and a lead wire 32, the temperature sensor 31 is embedded in the sealing member 20, and the lead wire 32 is electrically connected to the temperature sensor 31 and extends to the outside of the housing 10.

[0090] The temperature sensor 31 is used to detect the temperature in the accommodation cavity 101. The temperature sensor 31 can be divided into two types according to the measurement method: contact type (such as thermometer) and non-contact type (such as radiation temperature measurement); according to the sensor material and electronic component characteristics, it can be divided into two types: thermal resistor and thermocouple.

[0091] The lead wire 32 may include a wire (such as a copper wire, etc.) and an insulating layer wrapped around the wire. The lead wire 32 is electrically connected to the temperature sensor 31, and the wire extends outside the housing 10 to be electrically connected to the sampling plate 200, etc., so as to transmit the temperature information collected by the temperature sensor 31 to the sampling plate 200 through the lead wire 32. Transmitting temperature information through the lead wire 32 makes the time difference between temperature collection and transmission smaller, thereby improving the timeliness of temperature abnormality reminders, and the structure of the temperature detection element 30 is simpler and less prone to damage or failure.

[0092] In some embodiments, reference Figure 7 and Figure 10-11 As shown, Fig.10 for Fig. 9 A cross-sectional view along the CC line; Fig.11 for Fig.10 The middle circle shows an enlarged structural diagram of D. The sealing member 20 is provided with a recess 21 , and the temperature sensor 31 is located in the recess 21 and connected to the inner surface of the recess 21 by means of adhesive 22 .

[0093] The recess 21 may be a groove or a hole that penetrates the surfaces of both sides of the seal 20. The hole that penetrates the surfaces of both sides of the seal 20 may be connected to the accommodating chamber 101. The temperature sensor 31 is arranged in the hole to reduce the distance between the temperature sensor 31 and the accommodating chamber 101, and the temperature in the accommodating chamber 101 may be detected more directly, thereby improving the temperature detection accuracy. The notch of the groove may face the outside of the housing 10, that is, the space in the groove is not connected to the accommodating chamber 101, so that the temperature sensor 31 and the adhesive 22 located in the groove do not contact the electrolyte in the accommodating chamber 101, thereby preventing the temperature sensor 31 and the adhesive 22 from being corroded by the electrolyte, reducing the requirements for the corrosion resistance of the temperature sensor 31 and the adhesive 22, and helping to improve the reliability of the seal of the seal 20 at the through hole 102.

[0094] The adhesive 22 can be a conventional sealant or a thermally conductive adhesive. Among them, the sealant refers to a sealing material that deforms with the shape of the sealing surface, is not easy to flow, and has a certain adhesiveness, such as a material with a natural resin or synthetic resin, a natural rubber or a synthetic rubber as a matrix, etc. The sealing effect of the sealant is better. The thermally conductive adhesive is a thermally conductive, room temperature curing sealant. The thermally conductive adhesive has good thermal conductivity, can improve the thermal conductivity efficiency between the seal 20 and the temperature sensor 31, and improve the timeliness of temperature anomaly detection. For example, the thermally conductive adhesive can be but is not limited to epoxy thermally conductive adhesive, silicone thermally conductive adhesive, polyurethane adhesive, etc.

[0095] By connecting the temperature sensor 31 and the inner surface of the recess 21 with the adhesive 22, the stability of the fixation of the temperature sensor 31 can be improved, and the temperature sensor 31 is not easily separated from the seal 20 to affect the temperature detection result; the adhesive 22 can also protect and fix the temperature sensor 31 and the connection between the temperature sensor 31 and the lead wire 32 to improve the connection reliability of the temperature sensor 31 and the lead wire 32, and play a good waterproof effect. In addition, the adhesive 22 can fill the gap between the temperature sensor 31 and the inner surface of the recess 21, play a certain role in heat conduction, and help improve the temperature detection accuracy.

[0096] In some embodiments, Figure 7 and Fig.11 As shown, the lead wire 32 includes a first line segment 321 and a second line segment 322, the first line segment 321 connects the temperature sensor 31 and the second line segment 322, and the second line segment 322 extends to the outside of the housing 10. The first line segment 321 is a single-strand line, and the second line segment 322 is a multi-strand line. The adhesive 22 wraps the temperature sensor 31, the first line segment 321, and the connection between the first line segment 321 and the second line segment 322.

[0097] Among them, a single-strand wire refers to an integrated wire, such as a thicker copper wire. A multi-strand wire refers to a wire composed of multiple integrated wires, such as a combination of multiple thinner copper wires. The multi-strand wire has good heat dissipation effect, low resistance, low heat generation and is easy to connect with other components, and is easy to connect with structures such as the sampling plate 200 and transmit signals. However, the multi-strand wire is composed of a combination of multiple wires, and gaps will be formed between the wires. Even if the glue 22 is set in the recess 21, it is not easy for the glue 22 to completely fill the above-mentioned gap due to factors such as processing errors. If the multi-strand wire is directly connected to the temperature sensor 31, there is a risk that external water vapor will flow along the gaps of the multi-strand wire to the temperature sensor 31, causing damage to the temperature sensor 31.

[0098] Therefore, in the above embodiment, the multi-strand wires and the temperature sensor 31 are connected by a single-strand wire, and there is no gap in the single-strand wire itself and it is not easy to form a gap between the single-strand wire and the viscose 22. Even if the external water vapor flows along the gap of the multi-strand wire to the single-strand wire, it cannot flow further to the temperature sensor 31, thereby improving the blocking effect of the viscose 22 on the external water vapor and reducing the risk of water damage to the temperature sensor 31. In addition, the viscose 22 wraps the temperature sensor 31, the first line segment 321, and the connection between the first line segment 321 and the second line segment 322, so that the viscose 22 can protect the connection between the temperature sensor 31 and the first line segment 321, and the connection between the first line segment 321 and the second line segment 322, thereby improving the reliability of the electrical connection.

[0099] According to some embodiments of the present invention, Figure 7As shown, at least part of the sealing member 20 is located in the accommodating cavity 101. In other words, part of the sealing member 20 is located in the accommodating cavity 101, or the sealing member 20 is located in the accommodating cavity 101 as a whole. By at least part of the sealing member 20 being located in the accommodating cavity 101, the effect of heat transfer from the accommodating cavity 101 to the sealing member 20 can be improved, and the energy loss of heat transfer can be reduced. The temperature of the sealing member 20 is made closer to the actual temperature in the accommodating cavity 101, and then the detection result of the temperature detection member 30 is closer to the actual temperature in the accommodating cavity 101, and the temperature detection accuracy is further improved.

[0100] According to some embodiments of the present invention, Figure 7 As shown, the sealing member 20 is provided in the through hole 102, and at least a part of the temperature detecting member 30 is located in the through hole 102. The sealing member 20 is provided in the through hole 102, which means that at least a part of the sealing member 20 is located in the through hole 102, and at least a part of the temperature detecting member 30 is provided in the part of the sealing member 20 located in the through hole 102, so that at least a part of the temperature detecting member 30 is located in the through hole 102, so as to reduce the distance between the temperature detecting member 30 and the accommodating cavity 101, and improve the detection accuracy of the temperature detecting member 30.

[0101] In some embodiments, at least part of the temperature detection element 30 is located in the accommodating cavity 101. By extending the temperature detection element 30 into the accommodating cavity 101, the distance between the temperature detection element 30 and the accommodating cavity 101 can be further reduced, and the detection accuracy of the temperature detection element 30 can be further improved.

[0102] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, a first pole 41 and a second pole 42 spaced apart in a set direction are provided on the wall of the housing 10 , and the through hole 102 is located between the first pole 41 and the second pole 42 .

[0103] In other words, the first pole 41, the second pole 42 and the through hole 102 are located on the same wall surface, and in the arrangement direction of the first pole 41 and the second pole 42, the through hole 102 is located between the first pole 41 and the second pole 42, and the corresponding temperature detection member 30 is located between the first pole 41 and the second pole 42. Figure 4 The set direction shown is the second direction F2.

[0104] Here, the through hole 102 can be located at any position between the first pole 41 and the second pole 42. For example, it can be located at the midpoint between the first pole 41 and the second pole 42 in the second direction F2 to further improve the detection accuracy, or the distances between the first pole 41 and the second pole 42 in the second direction F2 are unequal; for another example, it can be located at the midpoint of the wall of the shell 10 in the third direction F3 to further improve the detection accuracy, or the distances between the two side edges of the wall in the third direction F3 are unequal.

[0105] The first pole 41 and the second pole 42 are connected to the electrode assembly 40 in the housing 10. For the electrode assembly 40, the temperature of the area between the first pole 41 and the second pole 42 is higher than that of other areas. By providing the through hole 102 between the first pole 41 and the second pole 42, the temperature detection member 30 can detect the temperature of the area between the first pole 41 and the second pole 42 of the electrode assembly 40, so as to be more conducive to timely response when the temperature is abnormal.

[0106] According to some embodiments of the present invention, the seal 20 includes a metal part. For example, the metal part can be made of an anti-corrosion aluminum alloy. The metal material has good anti-corrosion performance and high strength, which is conducive to improving the sealing reliability of the seal 20 to the through hole 102, thereby improving the sealing of the battery cell 100, and reducing the risk of the temperature sensor 31 contacting the electrolyte, thereby increasing the service life of the temperature sensor 31.

[0107] In some specific embodiments, the seal 20 includes a metal part and an elastic part (such as rubber material, etc.), the metal part is penetrated through the through hole 102, and the metal part and the hole wall of the through hole 102 are sealed by the elastic part to improve the sealing effect.

[0108] According to some embodiments of the present invention, Figure 4-Figure 7 As shown, the through hole 102 is a liquid injection hole.

[0109] The injection hole is connected to the accommodating cavity 101. During the production process of the battery cell 100, after the electrode assembly 40 is placed in the accommodating cavity 101 and the cover 12 is sealed and connected to the shell 11, electrolyte can be injected into the accommodating cavity 101 through the injection hole, and the injection hole is sealed by the sealing member 20, so that the electrode assembly 40 can be charged and discharged normally. It should be noted that the function of the injection hole includes but is not limited to injecting liquid into the accommodating cavity 101, for example, the gas in the accommodating cavity 101 can also be discharged through the injection hole.

[0110] Therefore, the through hole 102 can be used to inject electrolyte into the shell 10 during the production process, and can also be used to install the temperature sensor 31 to detect the temperature in the accommodating cavity 101, which can reduce the number of openings on the shell 10 to simplify the structure.

[0111] In addition, for the battery cell 100 that needs secondary injection, the injection is divided into two parts. One part is the primary injection, that is, after the electrode assembly 40 is loaded into the shell 10 of the battery cell 100 and baked until the moisture reaches the standard, a part of the total injection volume, such as 80% to 90% of the total injection volume, is injected at one time. The second part is the secondary injection after the battery cell 100 is injected and formed once, so as to reach the total injection volume of the battery cell 100 in accordance with the process specifications. Therefore, in some embodiments, the injection hole can be used for both the first injection and repeated injection, and the corresponding seal 20 can removably seal the through hole 102. In the embodiment where the injection hole is only used for the first injection, the seal 20 can be removable or non-removable.

[0112] like Figure 2 As shown, the battery 1000 according to the embodiment of the second aspect of the utility model includes the battery cell 100 according to the embodiment of the first aspect of the utility model. Therefore, by adopting the above-mentioned battery cell 100, it is helpful to reduce the energy loss of the heat in the accommodating cavity 101 to the temperature detection member 30, and the detection result of the temperature detection member 30 is closer to the actual temperature inside the battery cell 100, thereby improving the temperature acquisition accuracy and prolonging the time for personnel to handle or escape when the temperature inside the battery cell 100 is abnormal.

[0113] In some embodiments, please refer to Figure 2 and Fig.12 , Fig.12 The schematic diagram of the matching structure of the battery cell 100 and the sampling plate 200 provided by the embodiment of the utility model. There are multiple battery cells 100, and the battery 1000 also includes a sampling plate 200, and the temperature detection components 30 of the multiple battery cells 100 are communicatively connected with the sampling plate 200.

[0114] The sampling board 200 is used to collect information of the battery cell 100 so as to monitor the status of the battery cell 100. For example, the sampling board 200 includes a flexible printed circuit board (FPC), which is connected to the temperature detection element 30. The flexible printed circuit board is used to receive the temperature signal detected by the temperature detection element 30 to monitor the temperature of the battery cell 100. In some embodiments, the sampling board 200 is also used to collect the voltage of the battery cell 100 to monitor the voltage of the battery cell 100.

[0115] The communication connection between the temperature detection element 30 and the sampling plate 200 can be a wireless connection or a wired connection. For example, in an embodiment where the temperature detector includes a lead wire 32, the lead wire 32 can be electrically connected to the sampling plate 200 by welding, crimping, etc.

[0116] The temperature detection components 30 of multiple battery cells 100 are communicatively connected with the sampling plate 200, so that the sampling plate 200 can collect the temperatures of multiple battery cells 100 and monitor the temperatures of multiple battery cells 100. The functional integration can simplify the structure and facilitate connection with an external transmission structure.

[0117] In some specific embodiments, Fig.12 As shown, Fig.12 The schematic diagram of the matching structure of the battery cell 100 and the sampling plate 200 provided in the embodiment of the utility model. The sampling plate 200 is provided with a through hole 210, and the lead wire 32 of the temperature detection element 30 is passed through the through hole 210. The lead wire 32 is located on the side of the sampling plate 200 facing away from the housing 10 and is electrically connected to the sampling plate 200.

[0118] The sampling plate 200 is disposed on the side of the housing 10 where the through hole 102 is provided (eg Fig.12 The sampling plate 200 shown is located on one side of the housing 10 along the first direction F1), so the sampling plate 200 will block the structure of the temperature detection element 30 to a certain extent. By providing a through hole 210 on the sampling plate 200, the connection end of the lead wire 32 used for connecting with the sampling plate 200 can be passed through the side of the sampling plate 200 facing away from the housing 10, so that the connection structure between the lead wire 32 and the sampling plate 200 is not easily blocked by the sampling plate 200 and the housing 10, which facilitates the connection operation between the lead wire 32 and the sampling plate 200, for example, it is convenient to weld or crimp the connection end of the lead wire 32 to the sampling plate 200.

[0119] Here, the through hole 210 can be a circular hole, a square hole or the like provided on the sampling plate 200 with an annular wall, or a notch provided on one side edge of the sampling plate 200, which is within the protection scope of the present invention.

[0120] The electrical device according to the third aspect of the utility model includes the battery 1000 according to the second aspect of the utility model, and the battery 1000 is used to provide electrical energy for the electrical device. Therefore, by adopting the above-mentioned battery 1000, it is helpful to reduce the energy loss of the heat in the accommodating cavity 101 to the temperature detection element 30, and the detection result of the temperature detection element 30 is closer to the actual temperature inside the battery cell 100, thereby improving the temperature acquisition accuracy and prolonging the time for personnel to handle or escape when the temperature inside the battery cell 100 is abnormal.

[0121] A battery cell 100 according to a specific embodiment of the present invention is described below with reference to the accompanying drawings.

[0122] like Figure 4-Figure 11 As shown, a battery cell 100 according to a specific embodiment of the present invention includes a housing 10 , an electrode assembly 40 , a sealing member 20 , and a temperature detecting member 30 .

[0123] The housing 10 includes an outer shell 11 and a cover 12. The cover 12 is disposed on one end of the outer shell 11 along the first direction F1 to cooperate with the outer shell 11 to define a receiving cavity 101. The cover 12 is provided with a first pole 41, a second pole 42, and a liquid injection hole located between the first pole 41 and the second pole 42.

[0124] The sealing member 20 is a sealing pin, which penetrates the injection hole and seals the injection hole. The sealing pin is provided with a groove, and the groove has a notch facing away from the accommodating cavity 101 .

[0125] The temperature detection member 30 includes a temperature sensor 31 and two lead wires 32. The two lead wires 32 are respectively welded to the electrodes at both ends of the temperature sensor 31. Each lead wire 32 includes a first line segment 321, a second line segment 322, and an insulating layer that wraps part of the second line segment 322. The first line segment 321 is a single-strand line, and the second line segment 322 is a multi-strand line. The first line segment 321 connects the electrode of the temperature sensor 31 and the second line segment 322. The temperature sensor 31, the first line segment 321, and part of the second line segment 322 are encapsulated in the groove by the adhesive 22, and the gap is filled by the adhesive 22. The part of the second line segment 322 located outside the groove is used for welding or crimping with the sampling plate 200.

[0126] In the above embodiment, the temperature detection component 30 and the sealing component 20 form a component, which blocks the liquid filling port. The lead wire 32 serves as a signal output end, and transmits signals with the sampling plate 200 to complete the collection of the internal temperature of the battery cell 100, thereby improving the temperature collection accuracy and extending the time for personnel to handle or escape when the temperature is abnormal.

[0127] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0128] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery cell, characterized in that: include: A shell having a receiving cavity, wherein the shell is provided with a through hole, wherein the through hole penetrates through a wall surface of the shell and communicates with the receiving cavity; A sealing member, sealing the through hole; The temperature detecting component is at least partially embedded in the sealing component, and the portion embedded in the sealing component is used to collect the temperature in the accommodating cavity.

2. The battery cell according to claim 1, characterized in that: The temperature detection component includes a temperature sensor and a lead wire. The temperature sensor is embedded in the sealing component. The lead wire is electrically connected to the temperature sensor and extends to the outside of the housing.

3. The battery cell according to claim 2, characterized in that: The sealing member is provided with a recessed portion, and the temperature sensor is located in the recessed portion and connected to the inner surface of the recessed portion by adhesive.

4. The battery cell according to claim 3, characterized in that: The lead wire includes a first line segment and a second line segment, the first line segment connects the temperature sensor and the second line segment, and the second line segment extends outside the housing, wherein, The first line segment is a single-strand line, the second line segment is a multi-strand line, and the adhesive wraps the temperature sensor, the first line segment, and the connection between the first line segment and the second line segment.

5. The battery cell according to claim 3, characterized in that: The recessed portion is a groove, and the notch of the groove faces outside the shell.

6. The battery cell according to claim 3, characterized in that: The adhesive is a thermally conductive adhesive.

7. The battery cell according to claim 1, characterized in that: At least part of the sealing member is located in the accommodating cavity.

8. The battery cell according to claim 1, characterized in that: The sealing component is disposed through the through hole, and at least a portion of the temperature detecting component is located in the through hole.

9. The battery cell according to claim 8, characterized in that: At least a portion of the temperature detecting element is located in the accommodating cavity.

10. The battery cell according to claim 1, characterized in that: A first pole and a second pole spaced apart from each other in a set direction are provided on a wall surface of the housing, and the through hole is located between the first pole and the second pole.

11. The battery cell according to claim 1, characterized in that: The sealing member includes a metal member.

12. The battery cell according to claim 1, characterized in that: The housing comprises an outer shell and a cover body, wherein the cover body covers an end opening of the outer shell to cooperate with the outer shell to define the accommodating cavity, and the outer shell or the cover body is provided with the through hole.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The through hole is a liquid injection hole.

14. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 13.

15. The battery according to claim 14, characterized in that There are a plurality of battery cells, and the battery further comprises a sampling plate, and the temperature detection components of the plurality of battery cells are communicatively connected with the sampling plate.

16. The battery according to claim 15, characterized in that The sampling plate is provided with a through hole, and the lead wire of the temperature detection component is passed through the through hole. The part of the lead wire located on the side of the sampling plate facing away from the shell is electrically connected to the sampling plate.

17. An electrical device, characterized in that: The invention comprises a battery as claimed in any one of claims 14 to 16, wherein the battery is used to provide electrical energy to the electrical device.

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