Single battery and battery pack

Abstract

The utility model provides a single battery and a battery pack. The single battery comprises a shell; the top cover comprises a cover body, a positive terminal and a negative terminal, the positive terminal and the negative terminal are both connected with the cover body, the cover body is connected with the shell, and a cavity is defined by the cover body and the shell; the battery cell is arranged in the cavity, the battery cell comprises a positive main tab, a negative main tab, a positive auxiliary tab and a negative auxiliary tab, the positive main tab is electrically connected with the positive terminal, and the negative main tab is electrically connected with the negative terminal; the detection device is connected to the cover body, and the positive auxiliary tab and the negative auxiliary tab are electrically connected with the detection device. According to the single battery, the battery structure can be simplified, and the energy density of the battery is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a single cell and a battery pack. Background Art

[0002] In the prior art, in battery devices that power electric vehicles, power tools, etc., a battery management system is usually required to monitor and manage the battery to ensure the safety and stability of the battery. Some of the detection equipment needs to detect parameters such as battery temperature, air pressure, and current, and transmit these data to the chip for analysis, so as to perform failure warning management. In the prior art, the existing power supply and voltage collection method is to weld nickel sheets at both ends of the pole to draw power from the board to power the detection device, resulting in redundant and complex battery cell structure, which is not only not conducive to the installation and assembly of the battery, but also the lead length required to draw power from the poles at both ends through the nickel sheet is relatively long, which not only reduces the accuracy of the detection data, but also occupies more space and reduces the energy density. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a single battery, which can simplify the battery structure and increase the energy density of the battery.

[0004] The utility model also provides a battery pack.

[0005] According to the first aspect of the utility model, the single cell battery comprises: a shell; a top cover, the top cover comprises a cover body, a positive terminal and a negative terminal, the positive terminal and the negative terminal are both connected to the cover body, the cover body is connected to the shell and defines a chamber; a battery cell, the battery cell is arranged in the chamber, the battery cell comprises a positive main pole ear, a negative main pole ear, a positive secondary pole ear and a negative secondary pole ear, the positive main pole ear is electrically connected to the positive terminal, and the negative main pole ear is electrically connected to the negative terminal; a detection device, the detection device is connected to the cover body, and the positive and secondary pole ears and the negative secondary pole ear are both electrically connected to the detection device.

[0006] According to the single cell battery of the first embodiment of the utility model, at least the following beneficial effects are achieved: by setting the positive and negative pole ears and the negative pole ears on the battery cell, when the detection device is electrically connected to the battery cell, it is no longer necessary to connect from the positive main pole ear and the negative main pole ear or the positive terminal and the negative terminal. Since the positions of the positive terminal and the negative terminal on the cover body are fixed, and the positions of the positive main pole ear and the negative main pole ear need to correspond to the positions of the positive terminal and the negative terminal, the positions of the positive main pole ear and the negative main pole ear cannot be flexibly adjusted. The distance between the detection device and the positive main pole ear and the negative main pole ear is far through the wire, so the positive and negative pole ears and the negative pole ears are set. By adjusting the positions of the positive and negative pole ears, the detection device and the battery cell are connected at a closer distance, so that the space occupied by the connection between the detection device and the battery cell is smaller, thereby improving the energy density of the battery. In addition, there is no need to set a longer wire, which simplifies the structure of the battery.

[0007] According to some embodiments of the utility model, the top cover also includes a positive electrode column and a negative electrode column, both of which pass through the cover body, the end of the positive electrode column away from the battery cell is connected to the detection device, the end of the positive electrode column close to the battery cell is connected to the positive and negative electrode ears, the end of the negative electrode column away from the battery cell is connected to the detection device, and the end of the negative electrode column close to the battery cell is connected to the negative and negative electrode ears.

[0008] According to some embodiments of the utility model, the top cover includes two positive poles and two negative poles, the battery cell includes two positive and negative pole tabs and two negative and negative pole tabs, the two positive poles and the two positive and negative pole tabs are connected in a one-to-one correspondence, and the two negative poles and the two negative and negative pole tabs are connected in a one-to-one correspondence.

[0009] According to some embodiments of the present invention, the detection device covers a side of the cover body facing away from the battery cell, and the detection device covers one end of the positive electrode column and the negative electrode column.

[0010] According to some embodiments of the present invention, a groove is provided on a side of the cover body facing away from the battery core, and the detection device is arranged in the groove.

[0011] According to some embodiments of the present invention, a through hole is opened at the bottom of the groove, and the two positive poles and the two negative poles are respectively arranged in different through holes.

[0012] According to some embodiments of the utility model, the positive electrode column and the negative electrode column both include a conductor and an insulating sleeve, the insulating sleeve is arranged on the outer circumference of the conductor to insulate the conductor from the cover body, the end of the conductor exposed in the groove is connected to the detection device, and the end of the conductor close to the battery cell is electrically connected to the battery cell.

[0013] According to some embodiments of the present invention, a metal foil is further provided at one end of the conductor close to the battery cell, the metal foil on the positive electrode column is connected to the positive and negative electrode tabs, and the metal foil on the negative electrode column is connected to the negative and negative electrode tabs.

[0014] According to some embodiments of the present invention, the foil on the positive electrode column is an aluminum foil, and the foil on the negative electrode column is a copper foil.

[0015] According to some embodiments of the utility model, a detection hole that penetrates the cover body is further opened on the cover body, and the detection device includes an air pressure sensor and a temperature sensor, and the air pressure sensor and the temperature sensor are arranged in the detection hole, the air pressure sensor is used to measure the air pressure in the chamber, and the temperature sensor is used to measure the temperature in the chamber, the detection device covers one end of the detection hole away from the battery cell, and a sealing ring is arranged on the detection hole to seal the detection hole and the cover body.

[0016] According to some embodiments of the present utility model, the detection device includes a circuit board and a chip, the circuit board is covered on the cover, and the chip is arranged on a side of the circuit board away from the battery cell.

[0017] The battery pack according to the second embodiment of the present invention comprises the single cell described in any one of the above embodiments.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1 This is a schematic diagram of the structure of a single cell in one embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of an explosion of a single cell in one embodiment of the utility model;

[0022] Figure 3 for Figure 2 An enlarged schematic diagram of the detection device area;

[0023] Figure 4 It is a schematic diagram of the structure of the pole in some embodiments of the utility model.

[0024] Reference numerals:

[0025] 1. Battery cell; 11. Body; 12. Positive main pole ear; 13. Negative main pole ear; 14. First positive secondary pole ear; 15. Second positive secondary pole ear; 16. First negative secondary pole ear; 17. Second negative secondary pole ear; 2. Top cover; 21. Cover body; 211. Groove; 212. Through hole; 213. Detection hole; 22. Positive terminal; 23. Negative terminal; 24. First positive secondary pole post; 241. Conductor; 242. Insulating sleeve; 243. Metal foil; 25. Second positive secondary pole post; 26. First negative secondary pole post; 27. Second negative secondary pole post; 28. Detection device; 281. Circuit board; 282. Chip; 3. Shell; 4. Sealing ring. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] Reference Figure 1 , Figure 2 and Figure 3The single cell battery of the first embodiment of the utility model comprises: a battery cell 1 and a top cover 2, the battery cell 1 comprises a main body, and the main body is connected with a positive main pole ear 12, a negative main pole ear 13, a first positive pole secondary pole ear 14, a second positive pole secondary pole ear 15, a first negative pole secondary pole ear 16 and a second negative pole secondary pole ear 17; the top cover 2 comprises a cover body 21 and a positive terminal 22, a negative terminal 23, a first positive pole secondary pole column 24, a second positive pole secondary pole column 25, a first negative pole secondary pole column 26, a second negative pole secondary pole column 27 and a detection The device 28, the first positive secondary pole 24, the second positive secondary pole 25, the first negative secondary pole 26 and the second negative secondary pole 27 are all connected to the detection device 28; the positive main pole ear 12 is connected to the positive terminal 22; the negative main pole ear 13 is connected to the negative terminal 23; the first positive secondary pole ear 14 is connected to the first positive secondary pole 24; the second positive secondary pole ear 15 is connected to the second positive secondary pole 25; the first negative secondary pole ear 16 is connected to the first negative secondary pole 26; the second negative secondary pole ear 17 is connected to the second negative secondary pole 27. The positive main pole ear 12 is connected to the positive terminal 22, the negative main pole ear 13 is connected to the negative terminal 23, the positive terminal 22 and the negative terminal 23 are exposed on the side of the cover 21 facing away from the battery cell 1, and form the positive and negative poles of the battery.

[0031] The first positive sub-pole column 24 and the second positive sub-pole column 25 are both positive poles, and the first negative sub-pole column 26 and the second negative sub-pole column 27 are both negative poles. When the detection device 28 detects the voltage and current of the battery cell 1, a pair of pins are required. Only one positive pole column and one negative pole column can be set, and one positive and negative pole lug and one negative pole lug are set accordingly. When detecting the impedance of the battery cell 1, four pins are required, that is, two positive poles and two negative poles are set, that is, the first positive sub-pole column 24, the second positive sub-pole column 25, the first negative sub-pole column 26, the second negative sub-pole column 27 and the detection device 28, and two positive and negative pole lugs and two negative pole lugs are set accordingly, that is, the first positive sub-pole lug 14, the second positive sub-pole lug 15, the first negative sub-pole lug 16 and the second negative sub-pole lug 17.

[0032] When the top cover is provided, the positive pole and the negative pole may not be provided, and the positive and negative pole tabs and the negative and negative pole tabs on the battery cell 1 may be directly connected to the detection device 28. When the positive and negative pole tabs and the negative and negative pole tabs are directly connected to the detection device 28, the structure is not reasonable and the operation is difficult. Therefore, the positive pole and the negative pole are provided on the cover body 21, so as to more conveniently connect the detection device 28 to the battery cell 1.

[0033] In the prior art, the detection device 28 on the cover 21 is connected to the positive terminal 22 and the negative terminal 23 through a lead wire. In the process of setting the wire, not only the structure of the entire battery is redundant and complicated, but also a large amount of space in the battery is occupied, which reduces the energy density of the battery. In the prior art, the positive terminal 22 and the negative terminal 23 are ports for the battery to supply power to the outside. When the positive terminal 22 and the negative terminal 23 are set, the distance between the positive terminal 22 and the negative terminal 23 is usually set farther. The position of the positive and negative electrodes of the battery is set farther, mainly for safety and performance considerations. First of all, from a safety perspective, setting the positive and negative electrodes of the battery farther can prevent short circuits inside the battery. If the positive and negative electrodes are too close, then during the use of the battery, especially under high load or high temperature environment, the materials inside the battery may contact each other due to thermal expansion or chemical reaction, resulting in short circuits and thermal runaway of the battery, which may cause fire or explosion. Secondly, from a performance perspective, setting the positive and negative electrodes of the battery farther apart can improve the energy density and power density of the battery. The energy density and power density of the battery determine the amount of energy that the battery can store and release and the speed of energy release. If the positive and negative electrodes are too close, the volume and weight of the battery will be limited, thereby limiting the energy density and power density of the battery. Setting the positive and negative electrodes farther apart can increase the volume and weight of the battery while ensuring battery safety, thereby improving the energy density and power density of the battery. Finally, setting the positive and negative electrodes of the battery farther apart can also help improve the life of the battery. If the positive and negative electrodes are too close, the chemical reaction inside the battery may be too intense, resulting in a shortened battery life. Setting the positive and negative electrodes farther apart can slow down the chemical reaction rate inside the battery, thereby extending the life of the battery. In summary, setting the positive and negative electrodes of the battery farther apart is to ensure battery safety, improve battery performance, and extend battery life.

[0034] In this solution, two positive and negative pole ears and two negative pole ears are re-leaded out from the body 11 of the battery cell 1, namely, the first positive pole ear 14, the second positive pole ear 15, the first negative pole ear 16 and the second negative pole ear 17. The positions of the re-set first positive pole ear 14, the second positive pole ear 15, the first negative pole ear 16 and the second negative pole ear 17 have great flexibility, and their positions on the battery cell 1 can correspond to the positions of the pins of the electrical connection of the detection device 28, so that there is no need to set leads, and only new poles need to be set that pass through both sides of the cover body 21, namely, the first positive pole ear 24, the second positive pole ear 25, the first negative pole ear 26 and the second negative pole ear 27. The positions of the first positive secondary pole 24, the second positive secondary pole 25, the first negative secondary pole 26 and the second negative secondary pole 27 on the cover 21 correspond to the positions of the pins on the detection device 28, thereby greatly shortening the connection distance with the detection device 28, and the positions of the first positive secondary pole ear 14, the second positive secondary pole ear 15, the first negative secondary pole ear 16 and the second negative secondary pole ear 17 on the battery cell 1 are also arranged according to the first positive secondary pole 24, the second positive secondary pole 25, the first negative secondary pole 26 and the second negative secondary pole 27, so that one end of the newly arranged four poles can be directly connected to the pole ear on the battery cell 1, and the other end can be directly connected to the detection device 28. Thus, not only the wire structure that makes the battery structure redundant is eliminated, but also the space occupied by the connection between the detection device 28 and the battery cell 1 is reduced, thereby improving the energy density of the battery.

[0035] When the detection device 28 tests the impedance of the battery cell 1, four pins are required, namely, the first positive sub-pole 24, the second positive sub-pole 25, the first negative sub-pole 26 and the second negative sub-pole 27. In the prior art, when connecting the four pins, connectors such as nickel sheets are used, which reduces the detection accuracy of the detection device 28 for the battery cell 1. In this solution, the pole is directly connected to the pole ear on the battery cell 1, which reduces the structure of the intermediate connector and improves the detection accuracy of the impedance of the battery cell 1.

[0036] Furthermore, the detection device 28 covers the side of the cover 21 facing away from the battery cell 1, and covers one end of the first positive sub-pole 24, the second positive sub-pole 25, the first negative sub-pole 26, and the second negative sub-pole 27. By directly covering the detection device 28 on the first positive sub-pole 24, the second positive sub-pole 25, the first negative sub-pole 26, and the second negative sub-pole 27, the first positive sub-pole 24, the second positive sub-pole 25, the first negative sub-pole 26, and the second negative sub-pole 27 can be directly connected to the corresponding pins on the detection device 28 after extending from the cover 21, without the need for connection through leads. At the same time, the detection device 28 presses and covers one end of the first positive sub-pole 24, the second positive sub-pole 25, the first negative sub-pole 26, and the second negative sub-pole 27, so that one end of the first positive sub-pole 24, the second positive sub-pole 25, the first negative sub-pole 26, and the second negative sub-pole 27 can be abutted against the corresponding pins without the need for welding or other fixed connections, which simplifies the processing process and the structure of the top cover 2. This makes the detection device 28 more convenient to install and disassemble, and also improves the energy density of the battery.

[0037] Furthermore, when arranging the positive electrode column and the negative electrode column, the positive electrode column and the negative electrode column are arranged at intervals along the length direction of the current collector on the battery cell 1, so as to avoid the contact between the pole ears when the pole ears of the battery cell 1 are bent and connected to the poles, thereby preventing the occurrence of short circuits, etc. By arranging them at intervals along the length direction of the current collector, the arrangement direction of the positive electrode column and the negative electrode column is perpendicular to the bending direction of the pole ears, thereby avoiding interference between the pole ears.

[0038] A groove 211 is provided on the side of the cover 21 facing away from the battery cell 1, and the detection device 28 is provided in the groove 211. By providing the groove 211, the detection device 28 can be better positioned, so that the connection of the detection device 28 on the cover 21 is more firmly established. The detection device 28 can be fixedly connected in the groove 211 by a snap-on method, and the detection device 28 can also be more firmly connected in the groove 211 by applying glue or other means. After the groove 211 is provided, the protruding height of the detection device 28 is reduced, and the distance between the detection device 28 and the battery cell 1 is also made closer, shortening the connection length between the battery cell 1 and the detection device 28, further improving the energy density of the battery. Furthermore, the side of the detection device 28 facing away from the battery cell 1 is flush with the side of the cover 21 facing away from the battery cell 1, that is, the thickness of the detection device 28 is equal to the depth of the groove 211. The side of the top cover 2 facing away from the battery cell 1 is made flatter.

[0039] At least four through holes 212 are provided at the bottom of the groove 211, and the first positive sub-pole column 24, the second positive sub-pole column 25, the first negative sub-pole column 26 and the second negative sub-pole column 27 are respectively arranged in the through holes 212. The first positive sub-pole column 24, the second positive sub-pole column 25, the first negative sub-pole column 26 and the second negative sub-pole column 27 are arranged at the position of the groove 211. Since the position of the groove 211 is the thinnest position on the cover 21, the lengths of the first positive sub-pole column 24, the second positive sub-pole column 25, the first negative sub-pole column 26 and the second negative sub-pole column 27 can be shortened, further improving the energy density of the battery.

[0040] Reference Figure 4 The first positive sub-pole 24, the second positive sub-pole 25, the first negative sub-pole 26 and the second negative sub-pole 27 all include a conductor 241 and an insulating sleeve 242. The insulating sleeve 242 is sleeved on the conductor 241 so that the conductor 241 passes through the cover 21 and is insulated from the cover 21. The end of the conductor 241 exposed in the groove 211 is connected to the detection device 28, and the end of the conductor 241 close to the battery cell 1 is connected to the battery cell 1. The insulating sleeve 242 is first sleeved on the conductor 241 and then the two are set together in the through hole 212, so that there is better insulation between the conductor 241 and the cover 21.

[0041] A metal foil 243 is also provided at one end of the conductor 241 close to the battery cell 1. By providing the metal foil 243 at one end of the conductor 241 close to the battery cell 1, it can be better connected to the pole ear on the battery cell 1. When the top cover 2 is not welded to the battery cell 1, the conductor 241 can be more conveniently and firmly connected to the metal foil 243, and it is more difficult to weld the conductor 241 to the pole ear on the battery cell 1 after the top cover 2 is covered on the battery cell 1. Therefore, when the metal foil 243 is first welded on the conductor 241, and then the top cover 2 is covered on the battery cell 1 for welding, the metal foil 243 and the pole ear of the battery cell 1 have a larger contact area, which can be more convenient to fix and connect. The metal foil 243 can even be directly abutted against the first positive electrode secondary pole ear 14, the second positive electrode secondary pole ear 15, the first negative electrode secondary pole ear 16 or the second negative electrode secondary pole ear 17.

[0042] The foil on the first positive electrode sub-pole 24 and the second positive electrode sub-pole 25 is an aluminum foil, and the foil on the first negative electrode sub-pole 26 and the second negative electrode sub-pole 27 is a copper foil. In the battery cell 1, in order to reduce the internal resistance of the battery cell 1, the current collector of the positive electrode of the battery cell 1 is usually made of aluminum foil, and the current collector of the negative electrode of the battery cell 1 is made of copper foil. In the battery cell 1, the resistance of the negative electrode has a greater impact on the internal resistance of the battery cell 1, so the negative electrode uses a copper foil with better conductivity. In order to improve the welding effect, that is, the welding effect between copper foils is better, and the welding effect between aluminum foils is better, the foil on the first negative electrode sub-pole 26 and the second negative electrode sub-pole 27 is set to copper foil, and the foil on the first positive electrode sub-pole 24 and the second positive electrode sub-pole 25 is set to aluminum foil.

[0043] The single cell also includes a shell 3, a cover 21 fixedly connected to the shell 3 and defining a sealed cavity, and the battery cell 1 is disposed in the sealed cavity. During the manufacturing process of the battery, the battery cell 1 needs to be installed in the shell 3 first, and then the poles on the top cover 2 are welded to the pole ears on the battery cell 1. After the welding is completed, the cover 21 of the top cover 2 is sealed and welded to the shell 3 to provide a sealed environment for the battery cell 1.

[0044] The cover 21 is also provided with a detection hole 213 that penetrates the cover 21. The detection device 28 covers the end of the detection device 28 away from the battery cell 1 and is used to measure the air pressure and temperature in the sealed cavity. A sealing ring 4 is provided between the cover 21 and the detection device 28. The end of the detection hole 213 away from the battery cell 1 is provided in the sealing ring 4. By providing the detection hole 213 on the cover 21, the sensor for measuring air pressure and temperature in the detection device 28 is provided in the detection hole 213 to measure the air pressure and temperature of the battery. In the prior art, the sensor for detecting air pressure and temperature can only be provided inside the housing 3, which not only occupies a large space, but also requires a threading hole to transmit the information measured by the sensor, which not only occupies more space and reduces the energy density of the battery, but also requires a lead wire to make the structure of the top cover 2 more complicated. In order to avoid affecting the sealing of the battery due to the opening of the detection hole 213, a sealing ring 4 is provided on the detection hole 213, and the sealing ring 4 is pressed by the detection device 28 to ensure the sealing of the battery. Specifically, the detection device 28 includes a circuit board 281 and a chip 282. The circuit board 281 covers the cover 21, and the chip 282 is arranged on a side of the circuit board 281 away from the cover 21. The circuit board 281 presses the sealing ring 4 to ensure the sealing effect of the detection hole 213.

[0045] The battery pack according to the second embodiment of the utility model includes the single cell battery described in any of the above embodiments, wherein the single cells are electrically connected to each other. Specifically, the adjacent positive terminals or negative terminals on the single cells are connected by conductive connectors. Some detection devices on the battery pack draw power from the detection devices and the connectors that connect the single cells to each other through wires, making the overall structure of the battery pack more complicated, especially the longer wires make the battery pack more messy and difficult to assemble. By setting the single cell battery in any embodiment of the utility model, the detection device can draw power directly from the battery cell, making the structure of the battery pack more concise and the energy density higher.

[0046] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A single cell, characterized in that: include: case; A top cover, the top cover comprising a cover body, a positive terminal and a negative terminal, the positive terminal and the negative terminal are both connected to the cover body, and the cover body is connected to the shell and defines a chamber; A battery cell, wherein the battery cell is disposed in the chamber, the battery cell comprises a positive main pole ear, a negative main pole ear, a positive secondary pole ear and a negative secondary pole ear, the positive main pole ear is electrically connected to the positive terminal, and the negative main pole ear is electrically connected to the negative terminal; A detection device is connected to the cover body, and the positive and negative pole tabs and the negative and negative pole tabs are both electrically connected to the detection device.

2. The single cell according to claim 1, characterized in that: The top cover also includes a positive electrode column and a negative electrode column, both of which pass through the cover body, the end of the positive electrode column away from the battery cell is connected to the detection device, the end of the positive electrode column close to the battery cell is connected to the positive and negative electrode ears, the end of the negative electrode column away from the battery cell is connected to the detection device, and the end of the negative electrode column close to the battery cell is connected to the negative and negative electrode ears.

3. The single cell according to claim 2, characterized in that: The top cover includes two positive poles and two negative poles, the battery cell includes two positive and negative pole tabs and two negative and negative pole tabs, the two positive poles and the two positive and negative pole tabs are connected in one-to-one correspondence, and the two negative poles and the two negative and negative pole tabs are connected in one-to-one correspondence.

4. The single cell according to claim 2, characterized in that: The detection device covers a side of the cover body facing away from the battery core, and the detection device covers one end of the positive electrode column and the negative electrode column.

5. The single cell according to claim 2, characterized in that: A groove is arranged on a side of the cover body facing away from the battery core, and the detection device is arranged in the groove.

6. The single cell according to claim 5, characterized in that: A through hole is formed at the bottom of the groove, and the two positive poles and the two negative poles are respectively arranged in different through holes.

7. The single cell according to claim 5, characterized in that: The positive electrode column and the negative electrode column both include a conductor and an insulating sleeve, wherein the insulating sleeve is sleeved on the outer circumference of the conductor to insulate the conductor from the cover body, the end of the conductor exposed in the groove is connected to the detection device, and the end of the conductor close to the battery cell is electrically connected to the battery cell.

8. The single cell according to claim 7, characterized in that: A metal foil is also provided at one end of the conductor close to the battery cell. The metal foil on the positive electrode column is connected to the positive and negative electrode tabs, and the metal foil on the negative electrode column is connected to the negative and negative electrode tabs.

9. The single cell according to claim 8, characterized in that: The foil on the positive electrode column is an aluminum foil, and the foil on the negative electrode column is a copper foil.

10. The single cell according to claim 1, characterized in that: The cover body is also provided with a detection hole that passes through the cover body, and the detection device includes an air pressure sensor and a temperature sensor, which are arranged in the detection hole. The air pressure sensor is used to measure the air pressure in the chamber, and the temperature sensor is used to measure the temperature in the chamber. The detection device covers an end of the detection hole away from the battery cell, and a sealing ring is provided on the detection hole to seal the detection hole and the cover body.

11. The single cell according to claim 1, characterized in that: The detection device comprises a circuit board and a chip. The circuit board is covered on the cover body, and the chip is arranged on a side of the circuit board away from the battery cell.

12. A battery pack, characterized in that: A single cell comprising any one of claims 1 to 11.

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