Cover plate assembly, battery, battery pack and electric equipment

Abstract

The utility model discloses a cover plate assembly, a battery, a battery pack and electric equipment, the cover plate assembly comprises a cover plate body, a sensor assembly and an electric connection assembly, and the cover plate body is provided with a mounting hole; the sensor assembly is fixed to the side, facing the pole core, of the cover plate body and comprises a circuit board, a sensor and a shell, the sensor is connected to the circuit board, a containing cavity is formed in the shell, and the circuit board and the sensor are both fixed in the containing cavity; the electric connecting assembly comprises a sealing block and a first electric connecting piece, the sealing block is located in the mounting hole and used for sealing the mounting hole, one end of the first electric connecting piece is connected to the circuit board, and the other end of the first electric connecting piece penetrates through the sealing block. According to the cover plate assembly provided by the embodiment of the utility model, the circuit board and the sensor are fixed in the shell, so that the anti-corrosion effect of the sensor assembly can be improved; electric signals of the sensor are transmitted to the outside through the sealing block, and the purposes that the outside supplies power to the built-in sensor assembly and the built-in sensor assembly transmits signals to the outside are achieved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cover plate assembly, a battery, a battery pack, and an electrical device. Background Technology

[0002] When a power battery encounters extreme and dangerous conditions during operation, the internal pressure of the battery cells will change significantly. Therefore, real-time monitoring of the evolution of the internal pressure of the cells can identify danger signals earlier and issue early warnings, thereby preventing dangerous situations from occurring. Currently, there are limited methods for detecting the internal pressure of batteries, and most of them require large external devices or may damage the battery's structure. Furthermore, these detection methods rarely address issues such as the corrosion resistance of the sensors themselves or the battery's sealing. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a cover plate assembly in which the circuit board and sensor are fixed inside the housing, improving the corrosion resistance of the sensor assembly; through an electrical connection assembly, the electrical signal of the sensor can be transmitted to the outside, and the cover plate body can also be sealed, thus achieving the purpose of external power supply to the built-in sensor assembly and signal transmission from the built-in sensor assembly to the outside.

[0004] This utility model also proposes a battery having the above-mentioned cover plate assembly.

[0005] A cover plate assembly according to a first aspect of the present invention includes: a cover plate body having a mounting hole; a sensor assembly fixed to the side of the cover plate body facing the electrode core, the sensor assembly including a circuit board, a sensor, and a housing, the sensor being connected to the circuit board, a receiving cavity being formed in the housing, the circuit board and the sensor being fixed in the receiving cavity; and an electrical connection assembly including a sealing block and a first electrical connector, the sealing block being located in the mounting hole and used to seal the mounting hole, one end of the first electrical connector being connected to the circuit board, and the other end passing through the sealing block.

[0006] According to the cover plate assembly of this utility model embodiment, the sensor assembly is fixed in the cover plate body. The sensor assembly has the advantages of small size and high sensitivity. The circuit board and the sensor are fixed in the housing, which can improve the corrosion resistance of the sensor assembly. Through the sealing block, the electrical signal of the sensor can be transmitted to the outside, and the cover plate body can also be sealed, realizing the purpose of powering the built-in sensor assembly from the outside and transmitting signals from the built-in sensor assembly to the outside.

[0007] According to some embodiments of the present invention, the receiving cavity is filled with liquid, and at least a portion of the wall surface of the shell is adapted to deform.

[0008] According to some embodiments of the present invention, the sensor is a pressure sensor, the pressure sensor is provided with a pressure sensing film, and at least a portion of the pressure sensing film is adapted to deformation.

[0009] According to some embodiments of this utility model, the volume of the receiving cavity is A, and the volume of the liquid is B, satisfying: 2 / 5 ≤ B / A ≤ 4 / 5.

[0010] According to some embodiments of the present invention, the sealing block includes a first part and a second part, the first part and the second part are connected along the thickness direction of the cover plate body, a portion of the second part is installed in the mounting hole and a portion extends out of the mounting hole so that the first part is spaced apart from the cover plate body, the first part is located on the outside of the cover plate body, the first electrical connector is led out through the first part and the second part, the first part is an insulating part and the second part is a metal part.

[0011] According to some embodiments of the present invention, the first part has a first through hole, the second part has a clearance channel communicating with the first through hole, the first electrical connector passes through the clearance channel in the first through hole, and the first electrical connector is spaced apart from the second part.

[0012] According to some embodiments of the present invention, the mounting hole has a first stepped surface facing the sealing block, the second portion is located on the first stepped surface, and the clearance channel communicates with the mounting hole.

[0013] According to some embodiments of the present invention, the second part has a second stepped surface disposed toward the cover plate body, and the second stepped surface abuts against the cover plate body.

[0014] According to some embodiments of the present invention, the first electrical connector includes a first connecting line and a first pin. One end of the first connecting line is connected to the circuit board, and the other end is connected to the first pin. The other end of the first pin passes through the sealing block.

[0015] According to some embodiments of the present invention, the first electrical connector further includes a connecting bracket, and the first connecting line and the first pin are connected through the connecting bracket.

[0016] According to some embodiments of the present invention, the cover plate assembly further includes: a spacer ring, the spacer ring being located on the side of the cover plate body facing the pole core, and the connecting bracket being located on the spacer ring.

[0017] According to some embodiments of the present invention, the connecting bracket includes a first bracket and a second bracket connected together, the first bracket and the second bracket being arranged at an angle, the first bracket having a first socket that mates with the first connecting line, and the second bracket having a second socket that mates with the first pin.

[0018] According to some embodiments of this utility model, the circuit board and the sensor are integrally formed.

[0019] According to some embodiments of the present invention, in the direction parallel to the cover plate body, the cross-sectional shape of the circuit board and the sensor is either rectangular or circular.

[0020] According to some embodiments of the present invention, the shell includes a first layer, a second layer and a third layer, which are stacked and connected sequentially from the inside out. The first layer and the third layer are both plastic layers, and the second layer is a metal layer.

[0021] A battery according to a second aspect of the present invention includes: a battery casing; an electrode core located inside the battery casing; and a cover plate assembly according to the first aspect of the present invention, the cover plate assembly covering the opening of the battery casing.

[0022] According to the battery of this utility model embodiment, by setting the above-mentioned cover plate assembly, the purpose of external power supply to the built-in sensor assembly and the purpose of the built-in sensor assembly transmitting signals to the outside can be realized, thereby further improving the safety performance of the battery.

[0023] According to some embodiments of the present invention, the battery further includes: a second electrical connector, the electrode core having a reference electrode, the cover plate assembly including a cover plate body and a spacer ring, the spacer ring being located on the side of the cover plate body facing the electrode core, one end of the second electrical connector being connected to the reference electrode, and the other end passing through the spacer ring and the sealing block.

[0024] According to some embodiments of the present invention, the sealing block has a second through hole, the spacer ring has a third through hole communicating with the second through hole, the second electrical connector includes a second connecting line and a second pin, the second pin passes through the second through hole, the second connecting line and the second pin are connected by a first adapter bracket, the first adapter bracket is located in the third through hole, and the second connecting line is connected to the reference electrode by the second adapter bracket.

[0025] According to some embodiments of the present invention, the second adapter bracket has a third socket and a first slot, the third socket mates with the second connecting line, and the first slot mates with the insertion area of ​​the reference electrode.

[0026] According to some embodiments of the present invention, the reference electrode extends along the height direction of the electrode core, and the insertion area is disposed toward the cover plate assembly; or, the reference electrode extends along the width direction of the electrode core, and the insertion area is disposed toward the circumferential direction of the battery casing.

[0027] According to some embodiments of the present invention, a plurality of reference electrodes are provided, and the number of the second electrical connectors is equal to and corresponds one-to-one with the number of the reference electrodes.

[0028] The battery pack according to a third aspect embodiment of the present invention includes: the battery of the second aspect embodiment of the present invention described above.

[0029] According to the battery pack of this utility model embodiment, the sealing block can not only enable the external power supply to the built-in sensor components and the transmission of signals from the built-in sensor components to the outside, but also lead out the second electrical connector to detect the electrical signal of the reference electrode, effectively identify the lithium plating signal of the battery, thereby further improving the safety performance of the battery pack.

[0030] The electrical device according to the fourth aspect of the present invention includes: the battery of the second aspect of the present invention or the battery pack of the third aspect of the present invention.

[0031] The electrical equipment according to the embodiments of this utility model improves the safety performance of the electrical equipment based on the safety performance of the battery pack.

[0032] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0033] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0034] Figure 1 This is a schematic diagram of a battery according to some embodiments of the present invention;

[0035] Figure 2 yes Figure 1 Partial exploded view of the battery;

[0036] Figure 3 This is a schematic diagram showing the cooperation between the cover plate body, the sensor assembly, and the electrical connection assembly according to some embodiments of the present invention;

[0037] Figure 4 This is a schematic diagram showing the cooperation between the cover plate body, the sensor assembly, and the electrical connection assembly according to other embodiments of the present invention;

[0038] Figure 5 This is a schematic diagram showing the cooperation between the cover plate body, the sensor assembly, and the electrical connection assembly according to some embodiments of the present invention;

[0039] Figure 6 yes Figure 1 A schematic diagram of the middle cover plate body;

[0040] Figure 7 yes Figure 1 A schematic diagram showing the mating of the middle sealing block and the first pin;

[0041] Figure 8 yes Figure 1 A schematic diagram of the connecting bracket in the middle;

[0042] Figure 9 This is a schematic diagram of the sensor assembly and the first connecting line in accordance with some embodiments of the present invention;

[0043] Figure 10 yes Figure 9 A cross-sectional view of the sensor assembly in conjunction with the first connecting line;

[0044] Figure 11 yes Figure 9 A schematic diagram showing the interaction between the circuit board, the sensor, and the first connecting line;

[0045] Figure 12 yes Figure 11 A bottom view of the circuit board, sensor, and first connecting line in conjunction;

[0046] Figure 13 This is a schematic diagram of the sensor assembly and the first connecting line in accordance with some embodiments of the present invention;

[0047] Figure 14 yes Figure 13 A cross-sectional view of the sensor assembly in conjunction with the first connecting line;

[0048] Figure 15 yes Figure 13 A schematic diagram showing the interaction between the circuit board, the sensor, and the first connecting line;

[0049] Figure 16 yes Figure 15 A bottom view of the circuit board, sensor, and first connecting line in conjunction;

[0050] Figure 17 This is an exploded view of a battery according to some embodiments of the present invention;

[0051] Figure 18 yes Figure 17 Exploded view of the second electrical connector;

[0052] Figure 19 This is an exploded view of a battery according to other embodiments of the present invention;

[0053] Figure 20 yes Figure 19 Exploded view of the second electrical connector;

[0054] Figure 21 This is a schematic diagram showing the separation of the cover plate body and the partition ring according to some embodiments of the present invention.

[0055] Figure label:

[0056] 100. Battery;

[0057] 10. Battery casing;

[0058] 20. Electrode core; 201. Reference electrode; 211. Dressing area; 212. Connecting area;

[0059] 30. Cover plate assembly;

[0060] 1. Cover plate body; 11. Mounting hole; 111. First step surface; 2. Spacer ring; 21. Third through hole;

[0061] 3. Sensor assembly; 31. Circuit board; 311. Connection point; 32. Sensor; 321. Pressure sensing membrane; 33. Housing; 331. Receiving cavity;

[0062] 4. Electrical connection assembly; 41. Sealing block; 411. First part; 412. Second part; 42. First electrical connector; 421. First connecting wire; 422. First pin; 423. Connecting bracket; 4231. First bracket; 4232. First socket; 4233. Second bracket; 4234. Second socket;

[0063] 5. Second electrical connector; 51. Second connecting wire; 52. Second pin; 53. First adapter bracket; 531. Fourth socket; 54. Second adapter bracket; 541. Third socket; 542. First slot. Detailed Implementation

[0064] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0065] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0067] The following is for reference. Figures 1-21 Description of cover plate assembly 30 according to an embodiment of the present utility model.

[0068] According to a first aspect embodiment of the present invention, a cover plate assembly 30 is used for a battery 100. The battery 100 includes a battery housing 10, which forms a receiving space with an opening at one end. An electrode core 20 is located in the receiving space. The cover plate assembly 30 is placed over the opening of the receiving space to close the opening of the receiving space and enclose the electrode core 20 in the receiving space.

[0069] The cover plate assembly 30 includes a cover plate body 1, a sensor assembly 3, and an electrical connection assembly 4. The cover plate body 1 has a mounting hole 11 that extends through the cover plate body 1 along its thickness direction, thus connecting the receiving space with the external space. The sensor assembly 3 is fixed to the side of the cover plate body 1 facing the electrode core 20, meaning the sensor assembly 3 is located within the receiving space of the battery casing 10. The sensor assembly 3 is used to detect pressure changes within the receiving space.

[0070] The electrical connection assembly 4 includes a sealing block 41 and a first electrical connector 42. The sealing block 41 is located inside the mounting hole 11 and is used to seal the mounting hole 11. For example, the sealing block 41 can be welded to the cover plate body 1 to seal the mounting hole 11, thereby increasing the sealing performance. One end of the first electrical connector 42 is connected to the sensor assembly 3, and the other end passes through the sealing block 41 and extends out to the outside of the battery 100 to transmit the pressure change of the containment space detected by the sensor assembly 3 to the outside.

[0071] The sensor assembly 3 includes a circuit board 31, a sensor 32, and a housing 33. The sensor 32 is connected to the circuit board 31, and a receiving cavity 331 is formed inside the housing 33. The circuit board 31 and the sensor are both fixed inside the receiving cavity 331.

[0072] Specifically, one end of the first electrical connector 42 is connected to the circuit board 31. When the internal air pressure of the battery 100 changes, the air pressure acts on the housing 33, and the sensor 32 receives an electrical signal, causing a change in the resistance or capacitance of the sensor 32. The chip on the circuit board 31 converts the resistance or capacitance signal into an electrical signal and transmits it to the outside of the battery 100. The outside can obtain the actual air pressure value by analyzing the electrical signal. The other end of the first electrical connector 42 can be connected to the battery's BMS test management system to monitor the evolution of the internal air pressure of the battery 100, thereby achieving the purpose of early warning of dangerous situations.

[0073] For example, the sealing block 41 can be an elastic plastic block. The elastic plastic block is installed in the mounting hole 11 with an interference fit. The other end of the first electrical connector 42 passes through the elastic plastic block. The elastic plastic block can not only seal the mounting hole 11, but also lead the other end of the first electrical connector 42 to the outside of the battery 100, and can also insulate the electrical connector and the cover plate body 1.

[0074] For example, sensor 32 can be soldered onto circuit board 31.

[0075] The sensor assembly 3 has advantages such as small size and high sensitivity. The circuit board 31 and the sensor 32 are fixed inside the housing 33. The housing 33 can prevent the electrolyte inside the battery 100 from impacting the circuit board 31 and the sensor 32, thus avoiding corrosion of the circuit board 31 and the sensor 32 by the electrolyte and improving the corrosion resistance of the sensor assembly 3. The sealing block 41 can lead the electrical signal of the sensor 32 to the outside and can also seal the cover body 1, realizing the purpose of external power supply to the built-in sensor assembly 3 and internal signal transmission from the built-in sensor assembly 3 to the outside.

[0076] Sensor 32 is a MEMS barometric pressure sensor. The dimensions of sensor 32 are controlled within 1.2cm in length, 1.2cm in width, and 6mm in height. The detection range of sensor 32 is -80kPa to 1200kPa, with a detection accuracy error of less than 4%. The operating temperature of sensor 32 is between -40℃ and 350℃. Circuit board 31 has a length controlled within 1.6cm, a width controlled within 1.6cm, and a thickness controlled within 3mm.

[0077] According to the cover plate assembly 30 of this utility model embodiment, the sensor assembly 3 is fixed inside the cover plate body 1. The sensor assembly 3 has advantages such as small size and high sensitivity. The circuit board 31 and the sensor 32 are fixed inside the housing 33, which can improve the corrosion resistance of the sensor assembly 3. Through the sealing block 41, the electrical signal of the sensor 32 can be transmitted to the outside, and the cover plate body 1 can also be sealed, realizing the purpose of powering the built-in sensor assembly 3 from the outside and transmitting signals from the built-in sensor assembly 3 to the outside.

[0078] According to some embodiments of this utility model, refer to Figures 3-4 , Figures 13-14 The cavity 331 is filled with liquid, but the liquid does not completely fill the cavity 331 so that the liquid can flow within the cavity 331. At least part of the wall of the housing 33 is adapted to deform. The sensor assembly 3 is fixed to the cover body 1 on the side facing the electrode core 20 via the housing 33.

[0079] When the air pressure inside the battery 100 changes, the air pressure acts on the housing 33, causing the housing 33 to deform. This causes the liquid inside the housing 33 to be squeezed and flowed, resulting in the sensor 32 receiving a pressure signal.

[0080] For example, the liquid is an inert liquid, such as silicone oil.

[0081] According to some embodiments of this utility model, refer to Figure 12 , Figure 15 Sensor 32 is a pressure sensor with a pressure sensing film 321 facing the receiving cavity 331. When the air pressure inside the battery 100 changes, the air pressure acts on the housing 33, causing the liquid inside the housing 33 to be squeezed and flowed, which causes the pressure sensing film 321 to deform, resulting in a change in the resistance or capacitance of the sensor 32. The chip on the circuit board 31 converts the resistance or capacitance signal into an electrical signal and transmits it to the outside of the battery 100. The outside can obtain the real air pressure value by analyzing the electrical signal.

[0082] According to some embodiments of this utility model, refer to Figure 10 , Figure 14The volume of the receiving cavity 331 is A, and the volume of the liquid is B, satisfying: 2 / 5 ≤ B / A ≤ 4 / 5. The liquid has flow space within the receiving cavity 331, facilitating its flow. The volume of the liquid can occupy 2 / 5, 3 / 5, or 4 / 5 of the volume of the receiving cavity 331.

[0083] According to some embodiments of this utility model, refer to Figures 6-7 The sealing block 41 includes a first part 411 and a second part 412. The first part 411 and the second part 412 are connected along the thickness direction of the cover plate body 1. Part of the second part 412 is installed in the mounting hole 11, and the remaining part extends out of the mounting hole 11 so that the first part 411 is spaced apart from the cover plate body 1. The first part 411 is located on the outside of the cover plate body 1.

[0084] The first part 411 is an insulating part, the second part 412 is a metal part, and the first electrical connector 42 is led out through the first part 411 and the second part 412. The first electrical connector 42 can be spaced apart from the second part 412 and is fixed and led out through the first part 411.

[0085] The second part 412 is a metal part, which facilitates the connection between the second part 412 and the cover plate body 1; the first part 411 is an insulating part, which can prevent short circuits when the first electrical connector 42 is led out through the first part 411.

[0086] The first part 411 and the second part 412 of the sealing block 41 are integral parts. For example, the connection between the second part 412 and the cover plate body 1 is welding, preferably brazing.

[0087] For example, the first part 411 is made of a non-metallic material such as ceramic, serving an insulating function, and is designed in an elliptical shape, but it can also be designed in a rectangular, square, or polygonal shape. The second part 412 has the same shape as the first part 411, also designed as an ellipse, and is made of a metallic material, consistent with the material of the cover plate body 1, preferably aluminum, to facilitate subsequent welding. The first part 411 and the second part 412 together form an elliptical sealing block 41, with the longest diameter of the ellipse within the range of 16mm and the shortest diameter within the range of 12mm.

[0088] According to some embodiments of this utility model, refer to Figures 6-7The first part 411 has a first through hole, and the second part 412 has a clearance channel communicating with the first through hole. The first electrical connector 42 passes through the clearance channel and is installed in the first through hole. The first electrical connector 42 is spaced apart from the second part 412 to avoid short circuit between the first electrical connector 42 and the second part 412. The first electrical connector 42 and the first through hole can be interference fit, so that the first electrical connector 42 can be fixed in the first through hole to fix the first electrical connector 42 to the cover plate body 1.

[0089] According to some embodiments of this utility model, refer to Figures 6-7 The mounting hole 11 has a first stepped surface 111 facing the sealing block 41, and a second portion 412 is located on the first stepped surface 111, with a clearance channel communicating with the mounting hole 11. The first stepped surface 111 can support and limit the sealing block 41, and the sealing block 41 can be welded and fixed to the first stepped surface 111. For example, the mounting hole 11 can be an elliptical hole, and the depth of the first stepped surface 111 is between 0.5mm and 1.5mm.

[0090] According to some embodiments of this utility model, refer to Figures 6-7 The second part 412 has a second stepped surface facing the cover body 1. The second stepped surface abuts against the cover body 1, so that the cover body 1 supports and limits the sealing block 41. The second part 412 can better isolate the cover body 1 from the sealing block 41.

[0091] For example, the combined action of the first step surface 111 and the second step surface can simultaneously limit both sides of the second part 412, improving the positional accuracy of the second part 412 fixed in the mounting hole 11.

[0092] According to some embodiments of this utility model, refer to Figures 2-5 , Figure 11 , Figure 15 The first electrical connector 42 includes a first connecting line 421 and a first pin 422. One end of the first connecting line 421 is connected to the circuit board 31, and the other end is connected to the first pin 422. The other end of the first pin 422 passes through the sealing block 41. By designing the first electrical connector 42 as a first connecting line 421 and a first pin 422, the first connecting line 421 can be pre-fixed to the circuit board 31, and the first pin 422 can be supplied as a whole with the sealing block 41 during material delivery, which facilitates the connection between the first connecting line 421 and the first pin 422.

[0093] For example, the first connecting line 421 can be soldered to the first pin 422.

[0094] In a specific example, connection points 311 are provided on the side of circuit board 31 facing away from sensor 32. At least three connection points 311 are designed. The number of first connecting lines 421 is the same as the number of connection points 311. One end of each first connecting line 421 is connected to a connection point 311, and the other end is connected to a first pin 422. The other end of the first pin 422 passes through a sealing block 41. The connection between the first connecting line 421 and the first pin 422 serves to provide power and transmit signals. The internal material of the first connecting line 421 is a metal, such as copper, silver, or aluminum, and the outside is covered with an insulating material, such as some polymer materials. The first connecting line 421 can be designed as a circular line or a rectangular sheet. The width of the rectangular sheet is consistent with the width of the connection point 311 on circuit board 31. The length of the first connecting line 421 is controlled between 0.5cm and 3cm. The first connecting line 421 is soldered to circuit board 31 by brazing or laser welding.

[0095] According to some embodiments of this utility model, refer to Figure 2 , Figure 5 , Figure 8 The first electrical connector 42 also includes a connecting bracket 423, through which the first connecting line 421 and the first pin 422 are connected, which facilitates the connection between the first connecting line 421 and the first pin 422.

[0096] For example, the connecting bracket 423 can be a metal part, and the first connecting line 421 and the first pin 422 are connected to the connecting bracket 423 respectively. The connecting bracket 423 can transmit the electrical signal of the first connecting line 421 to the first pin 422.

[0097] According to some embodiments of this utility model, refer to Figure 2 , Figure 5 , Figure 8 The cover plate assembly 30 also includes: a partition ring 2, which is located on the side of the cover plate body 1 facing the pole core 20, and a connecting bracket 423 located on the partition ring 2. The partition ring 2 provides installation space for the connecting bracket 423, which facilitates the fixing and support of the connecting bracket 423.

[0098] According to some embodiments of this utility model, refer to Figure 8The connecting bracket 423 includes a first bracket 4231 and a second bracket 4233 connected together, with the first bracket 4231 and the second bracket 4233 arranged at an angle. The first bracket 4231 has a first socket 4232 that mates with the first connecting wire 421. The first connecting wire 421 can be inserted into the first socket 4232, and the first connecting wire 421 can be press-fitted with the first socket 4232 to prevent the first connecting wire 421 from falling out of the first socket 4232. The number of first sockets 4232 is equal to the number of first connecting wires 421 and they correspond one-to-one. The second bracket 4233 has a first pin 422 that mates with the first pin. The second socket 4234 has a first pin 422 that can be inserted into it, and the first pin 422 can be interference-fitted with the second socket 4234 to prevent the first pin 422 from falling out of the second socket 4234. The number of first sockets 4232 is equal to the number of first pins 422 and they correspond one-to-one. The first connection line 421 cooperates with the first socket 4232 and the first pin 422 cooperates with the second socket 4234, which facilitates the cooperation between the first connection line 421 and the first pin 422 and the connecting bracket 423.

[0099] For example, the included angle between the first bracket 4231 and the second bracket 4233 can be between 75° and 125°, preferably a right angle.

[0100] For example, the first socket 4232 can be a circular or rectangular hole adapted to the first connecting line 421, and the second socket 4234 can be a circular or rectangular hole adapted to the first pin 422.

[0101] According to some embodiments of this utility model, refer to Figure 11 , Figure 15 The circuit board 31 and the sensor 32 are integrally molded, which makes the design of the circuit board 31 and the sensor 32 more stable, avoids the connection point between the circuit board 31 and the sensor 32, and makes the connection between the circuit board 31 and the sensor 32 more stable.

[0102] According to some embodiments of this utility model, refer to Figures 9-16 In the direction parallel to the cover plate body 1, the cross-sectional shape of the circuit board 31 and the sensor 32 is either rectangular or circular. The rectangular cross-sectional shape of the circuit board 31 and the sensor can reduce the processing cost of the circuit board 31 and the sensor 32; the circular cross-sectional shape of the circuit board 31 and the sensor 32 can make the design of the circuit board 31 and the sensor 32 more stable.

[0103] For example, the cross-sectional shape of the circuit board 31 and the sensor 32 is circular, and the diameter of the circle is within the range of 1.5cm.

[0104] For example, the cross-sectional shape of the circuit board 31 and the sensor 32 is rectangular, with the length and width of the rectangle controlled within the range of 1.6cm.

[0105] According to some embodiments of this utility model, refer to Figure 9 , Figure 13 The housing 33 includes a first layer, a second layer, and a third layer. The first layer, the second layer, and the third layer are stacked and connected in sequence from the inside out. The first layer and the third layer are both plastic layers, and the second layer is a metal layer. The first layer and the third layer can serve as insulation, and the second layer can serve as support for the first layer and the third layer.

[0106] For example, the first and second layers are bonded together with adhesive, and the second and third layers are bonded together with adhesive. The first layer can be a polyimide film, the second layer can be a calendered aluminum foil, and the third layer can be a polypropylene film.

[0107] In a specific example, after the circuit board 31 and the sensor 32 are fixed, the outer surface of the circuit board 31 and the sensor 32 is covered with a housing 33. After the covering is completed, the surrounding area is heat-sealed, leaving the liquid injection port unsealed. After the sealing is completed, the liquid injection port is injected with liquid. After the liquid injection is completed, the liquid injection port is also heat-sealed to prevent liquid leakage.

[0108] According to a second aspect embodiment of the present invention, the battery 100 includes a battery housing 10, an electrode core 20, and a cover plate assembly 30 as described in the first aspect embodiment of the present invention. The electrode core 20 is located inside the battery housing 10, and the cover plate assembly 30 covers the opening of the battery housing 10.

[0109] For example, battery 100 can be a square battery, a long blade battery, a short blade battery, a square blade battery, or a cylindrical battery, etc.

[0110] According to the embodiment of the present utility model, the battery 100, by providing the above-mentioned cover plate assembly 30, can realize the purpose of externally supplying power to the built-in sensor assembly 3 and the built-in sensor assembly 3 transmitting signals to the outside, thereby further improving the safety performance of the battery 100.

[0111] According to some embodiments of this utility model, refer to Figure 17 , Figure 19The battery 100 also includes: a second electrical connector 5; the electrode core 20 is provided with a reference electrode 201; the cover plate assembly 30 includes a cover plate body 1 and a spacer ring 2; the spacer ring 2 is located on the side of the cover plate body 1 facing the electrode core 20; one end of the second electrical connector 5 is connected to the reference electrode 201; the other end passes through the spacer ring 2 and the sealing block 41; the sealing block 41 is used to lead out the second electrical connector 5; the potential of the reference electrode 201 can be monitored through the second electrical connector 5; by comparing the difference between the reference electrode 201 and the negative electrode potential of the battery 100, the lithium plating signal of the battery 100 can be effectively identified, thereby further improving the safety performance of the battery 100.

[0112] For example, the sealing block 41 can be an elastic plastic part. The elastic plastic block is installed in the mounting hole 11 with an interference fit. The elastic plastic block can serve to insulate the second electrical connector 5 and the cover plate body 1.

[0113] According to some embodiments of this utility model, refer to Figure 17 , Figure 19 The sealing block 41 has a second through hole, and the spacer ring 2 has a third through hole 21. The third through hole 21 communicates with the second through hole, and the number of third through holes 21 and second through holes are equal and correspond one-to-one. The second electrical connector 5 includes a second connecting wire 51 and a second pin 52. The second pin 52 passes through the second through hole. When the material is received, the second pin 52 is received as part of the sealing block 41. The second connecting wire 51 and the second pin 52 are connected through a first adapter bracket 53. The first adapter bracket 53 is located inside the third through hole 21 to facilitate the connection of the second connecting wire 51 and the second pin 52. The second connecting wire 51 is connected to the reference electrode 201 through a second adapter bracket 54 to facilitate the connection of the second connecting wire 51 and the reference electrode 201.

[0114] Specifically, during material arrival, the second pin 52 and the first pin 422 are integrated with the sealing block 41.

[0115] For example, the diameter of the third via 21 is between 0.5mm and 3mm, and the first adapter bracket 53 can be interference-fitted into the third via 21.

[0116] For example, the second connecting line 51 is generally designed to be circular, containing conductive materials such as copper and aluminum, and covered with insulating polymer materials such as polyvinylidene fluoride, polyethylene, and polypropylene.

[0117] In one specific example, the sealing block 41 includes a first portion 411 and a second portion 412, which are connected along the thickness direction of the cover plate body 1. A portion of the second portion 412 is installed within the mounting hole 11, and the remaining portion extends out of the mounting hole 11, thus spaced the first portion 411 from the cover plate body 1. The first portion 411 is located outside the cover plate body 1. The first portion 411 has a second through hole spaced from the first through hole. The second portion 412 has a clearance channel communicating with the second through hole. A second electrical connector 5 passes through the clearance channel into the second through hole, and is spaced from the second portion 412. The first portion 411 is an insulating component, and the second portion 412 is a metal component.

[0118] The first part 411 and the second part 412 of the sealing block 41 are integral parts, with the second part 412 being a metal part. This facilitates the connection between the second part 412 and the cover plate body 1, for example, by welding, preferably brazing. The second electrical connector 5 is spaced apart from the second part 412 to prevent short circuits between them. The second electrical connector 5 and the second through hole can be an interference fit, allowing the second electrical connector 5 to be fixed within the second through hole, thereby securing the second electrical connector 5 to the cover plate body 1.

[0119] For example, the first adapter bracket 53 has a fourth socket 531 and a fifth socket at its two ends, respectively. The second pin 52 mates with the fourth socket 531, and the fourth socket 531 can be a rectangular hole adapted to the second pin 52. The fifth socket mates with the second connecting line 51, and the fifth socket can be a circular hole adapted to the second connecting line 51.

[0120] According to some embodiments of this utility model, refer to Figure 18 , Figure 20 The second adapter bracket 54 has a third socket 541 and a first slot 542. The third socket 541 mates with the second connecting line 51, and the first slot 542 mates with the insertion area 212 of the reference electrode 201.

[0121] For example, the third socket 541 can be a circular hole adapted to the second connecting line 51, and the first slot 542 can be a rectangular slot adapted to the reference electrode 201.

[0122] In a specific example, refer to Figures 17-20The reference electrode 201 includes a coating area 211 and a mating area 212, which are integrated structures. The coating area 211 is disposed on the electrode core 20, and the material of the coating area 211 can be lithium iron phosphate or pure lithium metal. The size and shape of the coating area 211 of the reference electrode 201 can be designed according to requirements, generally designed as a long strip with a length between 1cm and 30cm, a width between 0.2cm and 1cm, and a coating thickness between 1µm and 300µm.

[0123] According to some embodiments of this utility model, refer to Figures 17-20 The reference electrode 201 extends along the height direction of the electrode core 20, the insertion area 212 is arranged in the direction of the cover plate assembly 30, the second adapter bracket 54 extends along the height direction of the electrode core 20, one end of the second adapter bracket 54 has a third insertion hole 541, and the other end of the second adapter bracket 54 has a first slot 542.

[0124] Alternatively, the reference electrode 201 extends along the width direction of the electrode core 20, and the insertion area 212 is arranged in the circumferential direction of the battery casing 10. When the reference electrode 201 is arranged in the middle position of the electrode core 20, the second adapter bracket 54 needs to be modified. The second adapter bracket 54 extends along the width direction of the electrode core 20. The end of the second adapter bracket 54 facing the second connecting line 51 has a third insertion hole 541, and the end of the second adapter bracket 54 facing the reference electrode 201 has a first slot 542.

[0125] According to some embodiments of this utility model, refer to Figures 17-20 The reference electrode 201 is provided in multiple ways. The number of second electrical connectors 5 is equal to the number of reference electrodes 201 and corresponds one-to-one. Each second electrical connector 5 can transmit the electrical signal of the corresponding reference electrode 201.

[0126] The connection method between the second electrical connector 5 and the reference electrode 201 is as follows:

[0127] The first step is to arrange a reference electrode 201 in the electrode core 20. The reference electrode 201 can be arranged at both ends and the middle of the electrode core 20.

[0128] The second step is to assemble one end of the second adapter bracket 54 with the insertion area 212 of the reference electrode 201;

[0129] The third step is to assemble and connect the other end of the second adapter bracket 54 to the bottom end of the second connecting line 51.

[0130] Fourth step, assemble and connect the upper end of the second connecting line 51 to one end of the first adapter bracket 53;

[0131] Fifth step, assemble and connect the other end of the first adapter bracket 53 to one end of the second pin 52.

[0132] During the charging and discharging process of battery 100, by monitoring the difference between the potential of the second pin 52 connected to the reference electrode 201 and the negative electrode potential of battery 100, the lithium plating signal of battery 100 can be effectively identified, thereby further improving the safety performance of battery 100.

[0133] The battery pack according to a third aspect embodiment of the present invention includes: the battery 100 of the second aspect embodiment of the present invention described above.

[0134] According to the battery pack of this utility model embodiment, the sealing block 41 can not only enable the external power supply to the built-in sensor component 3 and the transmission of signals from the built-in sensor component 3 to the outside, but also lead out the second electrical connector 5 to detect the electrical signal of the reference electrode 201, effectively identify the lithium plating signal of the battery 100, thereby further improving the safety performance of the battery pack.

[0135] The electrical device according to the fourth aspect of the present invention includes: the battery 100 of the second aspect of the present invention or the battery pack of the third aspect of the present invention.

[0136] The electrical equipment according to the embodiments of this utility model improves the safety performance of the electrical equipment based on the safety performance of the battery pack.

[0137] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0138] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover plate assembly (30), characterized in that, include: The cover plate body (1) has mounting holes (11); A sensor assembly (3) is fixed to the side of the cover plate body (1) facing the pole core (20). The sensor assembly (3) includes a circuit board (31), a sensor (32) and a housing (33). The sensor (32) is connected to the circuit board (31). A receiving cavity (331) is formed in the housing (33). The circuit board (31) and the sensor are both fixed in the receiving cavity (331). An electrical connection assembly (4) includes a sealing block (41) and a first electrical connector (42). The sealing block (41) is located inside the mounting hole (11) and is used to seal the mounting hole (11). One end of the first electrical connector (42) is connected to the circuit board (31), and the other end passes through the sealing block (41).

2. The cover plate assembly (30) according to claim 1, characterized in that, The cavity (331) is filled with liquid, and at least a portion of the wall of the shell (33) is adapted to deform.

3. The cover plate assembly (30) according to claim 2, characterized in that, The sensor (32) is a pressure sensor, and the pressure sensor is provided with a pressure sensing membrane (321), at least a portion of which is adapted to deform.

4. The cover plate assembly (30) according to claim 2, characterized in that, The volume of the receiving cavity is A, and the volume of the liquid is B, satisfying: 2 / 5 ≤ B / A ≤ 4 / 5.

5. The cover plate assembly (30) according to claim 1, characterized in that, The sealing block (41) includes a first part (411) and a second part (412). The first part (411) and the second part (412) are connected along the thickness direction of the cover plate body (1). Part of the second part (412) is installed in the mounting hole (11), and part of it extends out of the mounting hole (11) so that the first part (411) is spaced apart from the cover plate body (1). The first part (411) is located on the outside of the cover plate body (1). The first electrical connector (42) is led out through the first part (411) and the second part (412). The first part (411) is an insulating part, and the second part (412) is a metal part.

6. The cover plate assembly (30) according to claim 5, characterized in that, The first part (411) has a first through hole, and the second part (412) has a clearance channel communicating with the first through hole. The first electrical connector (42) passes through the clearance channel in the first through hole, and the first electrical connector (42) is spaced apart from the second part (412).

7. The cover plate assembly (30) according to claim 6, characterized in that, The mounting hole (11) has a first stepped surface (111) facing the sealing block (41), the second portion (412) is located on the first stepped surface (111), and the clearance channel communicates with the mounting hole (11).

8. The cover plate assembly (30) according to claim 5, characterized in that, The second part (412) has a second stepped surface disposed toward the cover body (1), the second stepped surface abutting against the cover body (1).

9. The cover plate assembly (30) according to claim 1, characterized in that, The first electrical connector (42) includes a first connecting line (421) and a first pin (422). One end of the first connecting line (421) is connected to the circuit board (31), and the other end is connected to the first pin (422). The other end of the first pin (422) passes through the sealing block (41).

10. The cover plate assembly (30) according to claim 9, characterized in that, The first electrical connector (42) further includes a connecting bracket (423), through which the first connecting line (421) and the first pin (422) are connected.

11. The cover plate assembly (30) according to claim 10, characterized in that, The cover plate assembly (30) further includes: a baffle ring (2), the baffle ring (2) being located on the side of the cover plate body (1) facing the pole core (20), and the connecting bracket (423) being located on the baffle ring (2).

12. The cover plate assembly (30) according to claim 10, characterized in that, The connecting bracket (423) includes a first bracket (4231) and a second bracket (4233) connected together. The first bracket (4231) and the second bracket (4233) are arranged at an angle. The first bracket (4231) has a first socket (4232) that mates with the first connecting line (421), and the second bracket (4233) has a second socket (4234) that mates with the first pin (422).

13. The cover plate assembly (30) according to claim 1, characterized in that, The circuit board (31) and the sensor (32) are integrally formed.

14. The cover plate assembly (30) according to claim 1, characterized in that, In the direction parallel to the cover plate body (1), the cross-sectional shape of the circuit board (31) and the sensor (32) is either rectangular or circular.

15. The cover plate assembly (30) according to claim 1, characterized in that, The housing (33) includes a first layer, a second layer and a third layer. The first layer, the second layer and the third layer are stacked and connected in sequence from the inside to the outside. The first layer and the third layer are both plastic layers and the second layer is a metal layer.

16. A battery (100), characterized in that, include: Battery casing (10); The electrode core (20) is located inside the battery casing (10); The cover assembly (30) according to any one of claims 1-15, the cover assembly (30) covering the opening of the battery housing (10).

17. The battery (100) according to claim 16, characterized in that, The battery (100) further includes: a second electrical connector (5), the electrode core (20) is provided with a reference electrode (201), the cover plate assembly (30) includes a cover plate body (1) and a spacer ring (2), the spacer ring (2) is located on the side of the cover plate body (1) facing the electrode core (20), one end of the second electrical connector (5) is connected to the reference electrode (201), and the other end passes through the spacer ring (2) and the sealing block (41).

18. The battery (100) according to claim 17, characterized in that, The sealing block (41) has a second through hole, the partition ring (2) has a third through hole (21) communicating with the second through hole, the second electrical connector (5) includes a second connecting line (51) and a second pin (52), the second pin (52) passes through the second through hole, the second connecting line (51) and the second pin (52) are connected by a first adapter bracket (53), the first adapter bracket (53) is located in the third through hole (21), and the second connecting line (51) is connected to the reference electrode (201) by a second adapter bracket (54).

19. The battery (100) according to claim 18, characterized in that, The second adapter bracket (54) has a third socket (541) and a first slot (542), the third socket (541) engaging with the second connecting line (51), and the first slot (542) engaging with the insertion area (212) of the reference electrode (201).

20. The battery (100) according to claim 19, characterized in that, The reference electrode (201) extends along the height direction of the electrode core (20), and the insertion area (212) is disposed toward the cover plate assembly (30); or, the reference electrode (201) extends along the width direction of the electrode core (20), and the insertion area (212) is disposed toward the circumferential direction of the battery casing (10).

21. The battery (100) according to claim 17, characterized in that, The reference electrode (201) is provided in multiple forms, and the number of the second electrical connectors (5) is equal to the number of the reference electrodes (201) and corresponds one-to-one.

22. A battery pack, characterized in that, include: The battery according to any one of claims 16-21.

23. An electrical appliance, characterized in that, include: The battery according to any one of claims 16-21 or the battery pack according to claim 22.

Images