Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack, the single battery has a third direction Z. The single battery comprises: a housing having an accommodating cavity; the electrode assembly is arranged in the accommodating cavity; the top cover assembly comprises a top cover and lower plastic, the top cover is arranged on the shell in a covering mode and seals the containing cavity, the lower plastic is connected with the top cover and located between the top cover and the electrode assembly, and the lower plastic is provided with a first side face facing the electrode assembly in the third direction Z; and the acquisition plate is provided with a temperature acquisition part, is arranged on the lower plastic, and is positioned between the first side surface and the electrode assembly in the third direction Z. According to the single battery disclosed by the utility model, when thermal runaway occurs in the electrode assembly, as the acquisition plate is arranged on one side, facing the electrode assembly, of the lower plastic, temperature information can be quickly acquired in a short distance, and accurate monitoring on the temperature of the battery is realized.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a single cell battery and a battery pack. Background Technology

[0002] In recent years, with the booming development of new energy vehicles, higher requirements have been put forward for the monitoring of power batteries.

[0003] Traditional BMS (Battery Management System) uses cables to transmit battery data, resulting in cables between batteries and between the battery and control devices. This leads to a heavy load on the vehicle and affects its driving range. Therefore, wireless BMS has emerged. Wireless BMS transmits battery data wirelessly, eliminating the need for cables weighing tens of kilograms, thus reducing weight and extending the vehicle's driving range. Furthermore, eliminating cables significantly reduces material and installation costs, which is of great significance for promoting the development of new energy vehicles.

[0004] However, in the relevant wireless BMS architecture, the data acquisition components used to collect battery information are usually located on the outer surface of the battery top cover, making it difficult to accurately monitor the battery temperature. Utility Model Content

[0005] The main purpose of this invention is to propose a single-cell battery that aims to solve the technical problem in the existing battery wireless BMS architecture where the acquisition component is located on the outer surface of the battery top cover, making it difficult to accurately monitor the battery temperature and prone to damage.

[0006] To achieve the above objectives, this utility model proposes a single-cell battery with a third orientation, the single-cell battery comprising:

[0007] A housing having a receiving cavity;

[0008] An electrode assembly disposed in the accommodating cavity;

[0009] A top cover assembly, the top cover assembly including a top cover and a lower plastic, the top cover being connected to the housing and sealing the receiving cavity, the lower plastic being connected to the top cover and located on the side of the top cover facing the electrode assembly, the lower plastic having a first side facing the electrode assembly in the third direction;

[0010] A temperature acquisition plate having a temperature acquisition unit is disposed on the lower plastic and is located between the first side and the electrode assembly in the third direction.

[0011] In some embodiments, the first side of the lower plastic is provided with a first reinforcing rib, and the first reinforcing rib surrounds a first mounting groove with the opening facing the electrode assembly, and the acquisition plate is accommodated in the first mounting groove.

[0012] In some embodiments, the first side of the lower plastic is provided with a first boss and a second reinforcing rib. The first boss has a first sidewall, and the second reinforcing rib is connected to the first sidewall so that the second reinforcing rib and the first boss enclose a second mounting groove with the opening facing the electrode assembly, and the acquisition plate is accommodated in the second mounting groove.

[0013] In some embodiments, the top cover assembly further includes a positive electrode post and a negative electrode post spaced apart, both of which pass through the top cover and the lower plastic, and are electrically connected to the electrode assembly.

[0014] The acquisition board is connected to a first acquisition line and a second acquisition line. The first acquisition line is electrically connected to the positive terminal, and the second acquisition line is electrically connected to the negative terminal, for acquiring current and / or voltage.

[0015] In some embodiments, the single cell also has a first direction perpendicular to the third direction, the lower plastic includes a first plastic plate and a second plastic plate, the second plastic plate is connected to the first plastic plate along the first direction, the positive electrode post passes through the first plastic plate, and the negative electrode post passes through the second plastic plate.

[0016] The number of the acquisition board is one, which is disposed on one of the first plastic plate and the second plastic plate, and the acquisition board is electrically connected to both the positive terminal and the negative terminal; or, the number of the acquisition board is two, one of which is disposed on the first plastic plate and electrically connected to the positive terminal, and the other of which is disposed on the second plastic plate and electrically connected to the negative terminal, and the two acquisition boards are electrically connected to each other.

[0017] In some embodiments, the lower plastic is provided with a plurality of first through holes, which are opened through the third direction. On a plane perpendicular to the third direction, the orthographic projection of the acquisition plate covers at least a portion of the plurality of first through holes.

[0018] In some embodiments, the first side of the lower plastic is provided with a second protrusion, the second protrusion is provided with a third mounting groove, and the collecting plate is accommodated in the third mounting groove.

[0019] In some embodiments, the second boss is provided with a plurality of second through holes communicating with the third mounting groove, and on a plane perpendicular to the third direction, the orthographic projection of the acquisition board covers at least a portion of the plurality of second through holes;

[0020] The second boss is provided with a groove cover, which seals the third mounting groove.

[0021] In some embodiments, the single cell further has a first direction, the second boss has a first platform and a second platform, the first platform faces the electrode assembly in the third direction, the second platform is the surface of the second boss in the first direction, and the second platform is connected to the first platform; a plurality of second through holes are located on the first platform, and the slot of the third mounting groove is located on the second platform;

[0022] The top cover assembly further includes a positive electrode post and a negative electrode post spaced apart. The positive electrode post and the negative electrode post are both inserted through the top cover and the lower plastic. The positive electrode post and the negative electrode post are both electrically connected to the electrode assembly. The acquisition board is connected to a third acquisition line and a fourth acquisition line. The slot cover is provided with a first wire through hole and a second wire through hole. The third acquisition line is inserted through the first wire through hole and electrically connected to the positive electrode post. The fourth acquisition line is inserted through the second wire through hole and electrically connected to the negative electrode post.

[0023] This utility model also proposes a battery pack, which includes:

[0024] Box;

[0025] The data acquisition component is located inside the enclosure;

[0026] Multiple individual batteries as described above are disposed within the housing, and the acquisition boards of all individual batteries are communicatively connected to the acquisition component.

[0027] In this single-cell battery, the lower plastic has a first side facing the winding core in a third-party upward direction. The acquisition plate is disposed on the lower plastic and located between the first side and the winding core in a third-party upward direction. When thermal runaway occurs in the electrode assembly, since the acquisition plate is disposed on the side of the lower plastic facing the electrode assembly, it can quickly acquire temperature information at close range, thereby achieving accurate monitoring of the battery temperature. Furthermore, since the acquisition plate is located inside the battery, it can also prevent the acquisition plate from being damaged by external impacts, reducing the probability of damage and failure of the acquisition plate, thus ensuring the normal operation of the wireless BMS. Attached Figure Description

[0028] Figure 1 This is a schematic diagram showing the disassembly of a single battery cell in one embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal structure of a single battery cell in one embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the lower plastic structure of the top cover assembly of a single battery cell in one embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the lower plastic structure of the top cover assembly of a single battery cell according to another embodiment of the present invention;

[0032] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0033] Figure 6 This is a schematic diagram of the lower plastic structure of the top cover assembly of a single battery cell in another embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the lower plastic structure of the top cover assembly of a single battery cell in another embodiment of the present invention. Detailed Implementation

[0035] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0036] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0037] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0038] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0039] Reference Figures 1 to 3 , Figure 1 This is a schematic diagram showing the disassembly of a single battery cell in one embodiment of the present invention. Figure 2 This is a schematic diagram of the internal structure of a single battery cell in one embodiment of the present invention. Figure 3 This is a schematic diagram of the lower plastic structure of the top cover assembly of a single battery cell in one embodiment of the present invention:

[0040] This utility model embodiment proposes a single-cell battery, the single-cell battery having a third orientation Z, as shown in the figure. Figure 1 The single cell includes:

[0041] Housing 100, housing 100 having accommodating cavity 101;

[0042] Electrode assembly 200 is disposed in receiving cavity 101;

[0043] Top cover assembly 300 includes top cover 310 and lower plastic 320. Top cover 310 is connected to housing 100 and covers accommodating cavity 101. Lower plastic 320 is connected to top cover 310 and is located on the side of top cover 310 facing electrode assembly 200. Lower plastic 320 has a first side 3201 facing electrode assembly 200 in the third direction Z.

[0044] The acquisition plate 400 has a temperature acquisition part 401. The acquisition plate 400 is disposed on the lower plastic 320 and is located between the first side 3201 and the electrode assembly 200 in the third direction Z.

[0045] The single battery cell involved in this embodiment is the basic unit that constitutes the battery pack. It is an independent electrochemical energy storage device that can convert chemical energy into electrical energy through electrochemical reactions, or convert electrical energy into chemical energy for storage. The single battery cell can be a square battery and is used in electric vehicles and other fields.

[0046] like Figure 1 and Figure 2As shown, a single battery cell has a third direction Z, which can be the height direction of the single battery cell. In addition, the single battery cell also has a first direction X and a second direction Y, and the first direction X, the second direction Y, and the third direction Z are all perpendicular to each other. Specifically, the first direction X can be the length direction of the single battery cell, the second direction Y can be the width / thickness direction of the single battery cell, and the third direction Z can be the height direction of the single battery cell.

[0047] The casing 100 primarily serves to protect the internal components of the battery and is typically made of metal, such as aluminum. The electrode assembly 200 is housed within the receiving cavity 101 of the casing 100. The electrode assembly 200 can be a wound structure formed by stacking and winding positive electrode plates, a separator, and a negative electrode plate, or it can be a stacked structure. The separator is located between the positive and negative electrode plates, and its main function is to prevent direct contact between the positive and negative electrodes, thus preventing a short circuit, while allowing ions to pass freely between the positive and negative electrodes. The receiving cavity 101 of the casing 100 also contains an electrolyte, which serves as a medium for ion transport to ensure the conduction of ions inside the battery.

[0048] The top cover assembly 300, as a crucial component of the battery structure, is primarily located on the top of the housing 100 to provide a sealed protection, preventing electrolyte leakage and the entry of external elements such as water into the housing 100. This ensures the stability of the internal chemical environment of the battery, maintaining its performance and lifespan. In the top cover assembly 300, the top cover 310 and the lower plastic 320 are stacked along the third direction Z. The top cover 310 can be made of a metallic material, such as aluminum alloy, possessing sufficient strength and corrosion resistance to withstand internal battery pressure and external impacts. The lower plastic 320 isolates the top cover 310 from the electrode assembly 200, preventing short circuits and ensuring battery safety and reliability. Along the third direction Z of the individual battery cell, the first side 3201 of the lower plastic 320 faces the electrode assembly 200. In addition, the lower plastic 320 has a second side opposite to the first side 3201, which faces the top cover 310 and is fixed thereto.

[0049] The acquisition board 400 can be a circuit board with corresponding circuitry for transmitting and processing the acquired signal data. The temperature acquisition unit 401 of the acquisition board 400 can include a temperature sensor for acquiring temperature information of the electrode assembly 200. The temperature sensor can be a thermistor. Optionally, the acquisition board 400 can also have other acquisition devices, such as pressure sensors or voltage acquisition components, to acquire pressure, voltage, and other status information of the electrode assembly 200.

[0050] The data acquisition plate 400 is disposed on the lower plastic 320 and can be fixed to the lower plastic 320 by means such as adhesive bonding or hot-melt connection. Furthermore, on the third direction Z of the single cell, the data acquisition plate 400 is located between the first side 3201 and the electrode assembly 200. There can be one or more data acquisition plates 400; this embodiment does not limit the number of data acquisition plates 400 provided.

[0051] When the electrode assembly 200 experiences thermal runaway, the acquisition board 400, positioned on the side of the lower plastic 320 facing the electrode assembly 200, can rapidly acquire temperature information at close range, enabling precise monitoring of the battery temperature. Furthermore, because the acquisition board 400 is located inside the battery, it is protected from external impacts, reducing the likelihood of damage and failure, thus ensuring the normal operation of the wireless BMS.

[0052] Optionally, such as Figure 3 As shown, the acquisition board 400 is connected to an antenna 45. The main function of the antenna 45 is to transmit the data acquired by the acquisition board 400 to external devices (such as the acquisition components of the battery pack) to achieve wireless BMS communication. For example, Figure 1 As shown, a signal hole 102 may be provided on the housing 100 or the top cover assembly 300. The antenna 45 passes through the signal hole 102 or is provided adjacent to the signal hole 102. The signal hole 102 allows the signal emitted by the antenna 45 to be transmitted out with low loss.

[0053] In some embodiments, such as Figure 3 As shown, the first side 3201 of the lower plastic 320 is provided with a first reinforcing rib 11, and the first reinforcing rib 11 surrounds and forms a first mounting groove 21 with the groove facing the electrode assembly 200, and the acquisition plate 400 is housed in the first mounting groove 21.

[0054] The first reinforcing rib 11 is an auxiliary structure used to increase the structural strength and rigidity of the lower plastic 320. On the first side 3201 of the lower plastic 320, the first reinforcing rib 11 can be a slender part that protrudes towards the electrode assembly 200. Without significantly increasing the structural weight and material cost of the lower plastic 320, it can effectively improve the load-bearing capacity and deformation resistance of the lower plastic 320, and prevent the lower plastic 320 from being damaged such as dents when subjected to collisions or vibrations.

[0055] The first reinforcing rib 11 encloses a first mounting groove 21 adapted to the acquisition plate 400. The shape of the first mounting groove 21 is the same as the shape of the acquisition plate 400, and the opening of the first mounting groove 21 faces the electrode assembly 200. The acquisition plate 400 can be accommodated in the first mounting groove 21 through the opening of the first mounting groove 21. The number of first mounting grooves 21 enclosed by the first reinforcing rib 11 can be one or more, and the number of acquisition plates 400 can also be one or more, with each acquisition plate 400 correspondingly accommodated in one first mounting groove 21. The acquisition plate 400, located in the first mounting groove 21 enclosed by the first reinforcing rib 11, can be positioned and installed on the lower plastic 320. Furthermore, the first reinforcing rib 11, surrounding the periphery of the acquisition plate 400, also provides mechanical protection for the acquisition plate 400. Optionally, when the acquisition board 400 is connected to acquisition lines (such as acquisition lines for acquiring current and / or voltage information), a first wiring hole may be provided on the first reinforcing rib 11, and the acquisition lines pass through the first wiring hole for wiring configuration. The number and position of the first wiring holes can be set according to actual needs, and this embodiment does not limit this.

[0056] The acquisition plate 400 can be square or round, and the first mounting slot 21 matches the shape of the acquisition plate 400 for better assembly.

[0057] Reference Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the lower plastic structure of the top cover assembly of a single battery cell according to another embodiment of the present invention. Figure 5 for Figure 4 Enlarged view of point A in the middle:

[0058] In some embodiments, such as Figure 4 and Figure 5 As shown, the first side 3201 of the lower plastic 320 is provided with a first boss 31 and a second reinforcing rib 12. The first boss 31 has a first side wall, and the second reinforcing rib 12 is connected to the first side wall so that the second reinforcing rib 12 and the first boss 31 enclose to form a second mounting groove 22 with the groove opening facing the electrode assembly 200. The acquisition plate 400 is housed in the second mounting groove 22.

[0059] The first boss 31 may be located at the end of the lower plastic 320, forming a thick protrusion to abut against the electrode assembly 200 to prevent the electrode assembly 200 from shaking. The second reinforcing rib 12 is an auxiliary structure used to increase the structural strength and rigidity of the lower plastic 320. On the first side 3201 of the lower plastic 320, the second reinforcing rib 12 may be a slender protrusion. Without significantly increasing the structural weight and material cost of the lower plastic 320, it effectively improves the load-bearing capacity and deformation resistance of the lower plastic 320, and can prevent the lower plastic 320 from being damaged such as dents when subjected to impact or vibration. The protrusion thickness of the second reinforcing rib 12 is less than the protrusion thickness of the first boss 31.

[0060] The second reinforcing rib 12 and the first sidewall of the first protrusion 31 form a second mounting groove 22 adapted to the acquisition plate 400. The groove shape of the second mounting groove 22 is the same as the plate shape of the acquisition plate 400. The opening of the second mounting groove 22 faces the electrode assembly 200, and the acquisition plate 400 can be accommodated in the second mounting groove 22 through the opening of the second mounting groove 22. The number of second mounting grooves 22 formed by the second reinforcing rib 12 and the first protrusion 31 can be one or more, and the number of acquisition plates 400 can be one or more, with each acquisition plate 400 correspondingly accommodated in one second mounting groove 22. The acquisition plate 400, located in the second mounting groove 22 formed by the second reinforcing rib 12 and the first protrusion 31, can be positioned and installed on the lower plastic 320. Furthermore, the second reinforcing rib 12 and the first protrusion 31 surrounding the periphery of the acquisition plate 400 also provide mechanical protection for the acquisition plate 400. Optionally, when the acquisition board 400 is connected to acquisition lines (such as acquisition lines for acquiring current and / or voltage information), a second wiring hole can be provided on the second reinforcing rib 12, and the acquisition lines pass through the corresponding second wiring hole for wiring configuration. The number and position of the second wiring holes can be set according to actual needs, and this embodiment does not limit this.

[0061] Optionally, in the third direction Z, the height of the first boss 31 is greater than the height of the second reinforcing rib 12.

[0062] In some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the top cover assembly 300 also includes a positive electrode post 330 and a negative electrode post 340 spaced apart. The positive electrode post 330 and the negative electrode post 340 are both inserted through the top cover 310 and the lower plastic 320. The positive electrode post 330 and the negative electrode post 340 are both electrically connected to the electrode assembly 200.

[0063] The acquisition board 400 is connected to a first acquisition line 41 and a second acquisition line 42. The first acquisition line 41 is electrically connected to the positive terminal 330, and the second acquisition line 42 is electrically connected to the negative terminal 340, for acquiring current and / or voltage.

[0064] During battery use, the positive terminal 330 and negative terminal 340, which are installed on the top cover 310 and the lower plastic 320, serve as current input and output channels. For example, when the battery is connected to an electrical device (such as a car motor), the positive terminal 330 outputs positive charge, and the negative terminal 340 outputs negative charge, thus forming a current loop. This allows the chemical energy in the electrode assembly 200 to be converted into electrical energy to power the electrical device.

[0065] The acquisition board 400 is connected to the positive terminal 330 via the first acquisition line 41, enabling it to acquire current and / or voltage information at the positive terminal. It is also connected to the negative terminal 340 via the second acquisition line 42, enabling it to acquire current and / or voltage information at the negative terminal, thus achieving precise monitoring of the battery's current and / or voltage status. If the voltage of the electrode assembly 200 is too high or too low, the battery management system can take measures such as cutting off the charging or discharging circuit to prevent overcharging or over-discharging of the electrode assembly 200, thereby avoiding safety accidents such as thermal runaway, combustion, and explosion of the battery.

[0066] Reference Figure 6 , Figure 6 This is a schematic diagram of the lower plastic structure of the top cover assembly of a single battery cell in another embodiment of the present invention:

[0067] In some embodiments, such as Figure 6 As shown, the single cell also has a first direction X perpendicular to the third direction Z. The lower plastic 320 includes a first plastic plate 321 and a second plastic plate 322. The second plastic plate 322 is connected to the first plastic plate 321 along the first direction X. The positive electrode post 330 passes through the first plastic plate 321, and the negative electrode post 340 passes through the second plastic plate 322.

[0068] In this case, it can be that there is one acquisition board 400, which is disposed on one of the first plastic plate 321 and the second plastic plate 322, and the acquisition board 400 is electrically connected to both the positive terminal 330 and the negative terminal 340. Alternatively, there can be two acquisition boards 400, one of which is disposed on the first plastic plate 321 and electrically connected to the positive terminal 330, and the other of which is disposed on the second plastic plate 322 and electrically connected to the negative terminal 340, and the two acquisition boards 400 are electrically connected to each other.

[0069] The lower plastic 320 uses two plastic plates, namely a first plastic plate 321 and a second plastic plate 322. The shape and structure of the first plastic plate 321 and the second plastic plate 322 can be the same or different, and this embodiment does not limit this. In the first direction X of the single cell, the first plastic plate 321 and the second plastic plate 322 are connected. The connection method can include snap-fit, plug-in, fusion connection, etc., which are selected according to actual needs.

[0070] Based on the double plastic plate structure design used in the lower plastic 320, the acquisition plate 400 can be set with one or two.

[0071] When one acquisition board 400 is provided, it can be mounted on either the first plastic plate 321 or the second plastic plate 322. The acquisition board 400 is directly connected to the first acquisition line 41 and the second acquisition line 42, and is electrically connected to the positive terminal 330 and the negative terminal 340 respectively via the first and second acquisition lines 41 and 42. That is, by acquiring the potential difference between the positive and negative terminals using one acquisition board 400, the voltage value of the electrode assembly 200 is calculated, achieving precise monitoring of the battery voltage state.

[0072] When two acquisition boards 400 are provided, one acquisition board 400 is located on the first plastic plate 321 and electrically connected to the positive terminal 330 via the first acquisition line 41, while the other acquisition board 400 is located on the second plastic plate 322 and electrically connected to the negative terminal 340 via the second acquisition line 42. The two acquisition boards 400 are electrically connected to each other via a wire. That is, by acquiring the potential difference between the positive and negative terminals corresponding to the two acquisition boards 400, the voltage value of the electrode assembly 200 is calculated, achieving accurate monitoring of the battery voltage state. In addition, through the temperature acquisition unit 401 of the two acquisition boards 400, the battery temperature information can be acquired at different locations of the electrode assembly 200 to obtain more comprehensive battery temperature state information. This provides strong data support for battery state assessment, fault diagnosis, and predictive maintenance, and improves the reliability of the electrode assembly 200's operating status monitoring and early warning.

[0073] In some embodiments, the lower plastic 320 is provided with a plurality of first through holes 51, which are opened through the third direction Z. On a plane perpendicular to the third direction Z, the orthographic projection of the acquisition plate 400 covers at least a portion of the plurality of first through holes 51.

[0074] The multiple first through holes 51 can be arranged in an array to form a grid, with the grid corresponding to the mounting position of the acquisition plate 400. When the acquisition plate 400 is placed on the lower plastic 320, it covers at least a portion of the multiple first through holes 51, that is, it can cover only a portion of the first through holes 51 or cover all of the first through holes 51. Due to the design of the first through holes 51 on the lower plastic 320, heat can flow through the first through holes 51 from between the first side 3201 of the lower plastic 320 and the electrode assembly 200 to between the second side of the lower plastic 320 and the top cover, thereby allowing the heat to be evenly distributed and preventing heat from accumulating at the first acquisition plate 400, which can improve the accuracy of temperature detection. Furthermore, the design of multiple first through holes 51 on the lower plastic 320 can, to a certain extent, reduce the structural weight of the lower plastic 320, which helps to achieve a lightweight battery design.

[0075] Reference Figure 7 , Figure 7 This is a schematic diagram of the lower plastic structure of the top cover assembly of a single battery cell in another embodiment of the present invention:

[0076] In some embodiments, such as Figure 7 As shown, the first side 3201 of the lower plastic 320 is provided with a second boss 32, and the second boss 32 is provided with a third mounting groove 23, in which the collection plate 400 is housed.

[0077] The second protrusion 32 may be located at the end of the lower plastic 320, forming a wide and thick protrusion to abut against the electrode assembly 200 to prevent the electrode assembly 200 from shaking, while also providing insulation between the electrode assembly 200 and the top cover 310. The second protrusion 32 has a third mounting groove 23 adapted to the acquisition plate 400. The shape of the groove 23 is the same as the shape of the acquisition plate 400, and the acquisition plate 400 can be accommodated in the third mounting groove 23 through its opening. The second protrusion 32 may have one or more third mounting grooves 23, and the acquisition plate 400 may also have one or more, with each acquisition plate 400 corresponding to one third mounting groove 23. Providing a third mounting groove 23 within the second protrusion 32 of the lower plastic 320 to accommodate the acquisition plate 400 saves space and also achieves a battery weight reduction effect.

[0078] In some embodiments, such as Figure 7 As shown, the second boss 32 is provided with a plurality of second through holes 52 that communicate with the third mounting groove 23. On a plane perpendicular to the third direction Z, the orthographic projection of the acquisition board 400 covers at least a portion of the plurality of second through holes 52.

[0079] In some embodiments, the second boss 32 is provided with a groove cover 350, which covers the third mounting groove 23.

[0080] The third mounting slot 23 is equipped with a slot cover 350, which is adapted to the opening of the third mounting slot 23. After the acquisition plate 400 is housed in the third mounting slot 23, it is sealed in the third mounting slot 23 by the slot cover 350, so that the acquisition plate 400 is stably set in the third mounting slot 23. Multiple second through holes 52 can be arranged in an array to form a grid of holes, the positions of which correspond to the positions of the third mounting slot 23. When the acquisition plate 400 is housed in the third mounting slot 23, it covers at least a portion of the multiple second through holes 52; that is, the acquisition plate 400 can cover only a portion of the second through holes 52 or cover all of them. Due to the design of the second through holes 52 on the second protrusion 32, heat can enter the third mounting slot 23 of the second protrusion 32 through the second through holes 52, thereby enabling the acquisition plate 400 to quickly and accurately acquire temperature information and achieve precise monitoring of battery temperature. Furthermore, the design of multiple second through holes 52 on the second protrusion 32 can reduce the structural weight of the lower plastic 320 to a certain extent, which helps to achieve a lightweight battery design.

[0081] In some embodiments, such as Figure 7 As shown, the single cell also has a first direction X, the second protrusion 32 has a first platform and a second platform, the first platform faces the electrode assembly 200 in the third direction Z, the second platform is the surface of the second protrusion 32 in the first direction X, and the second platform is connected to the first platform; a plurality of second through holes 52 are located on the first platform, and the slot of the third mounting groove 23 is located on the second platform.

[0082] The top cover assembly 300 also includes a positive electrode post 330 and a negative electrode post 340 spaced apart. The positive electrode post 330 and the negative electrode post 340 are both inserted through the top cover 310 and the lower plastic 320. The positive electrode post 330 and the negative electrode post 340 are both electrically connected to the electrode assembly 200. The acquisition board 400 is connected with a third acquisition line 43 and a fourth acquisition line 44. The slot cover 350 is provided with a first wire hole and a second wire hole. The third acquisition line 43 is inserted through the first wire hole and electrically connected to the positive electrode post 330. The fourth acquisition line 44 is inserted through the second wire hole and electrically connected to the negative electrode post 340.

[0083] The data acquisition board 400 is connected to the positive terminal via a third acquisition line 43 and to the negative terminal via a fourth acquisition line 44. Specifically, one end of the third acquisition line 43 is connected to the data acquisition board 400 and passes through the first wire hole of the slot cover 350, while the other end is connected to the positive terminal, allowing for the acquisition of current and / or voltage information at the positive terminal and its transmission to the data acquisition board 400. Similarly, one end of the fourth acquisition line 44 is connected to the data acquisition board 400 and passes through the second wire hole of the slot cover 350, while the other end is connected to the negative terminal, allowing for the acquisition of current and / or voltage information at the negative terminal and its transmission to the data acquisition board 400. The data acquisition board 400 acquires current and / or voltage information from both the positive and negative terminals via the third acquisition line 43 and the fourth acquisition line 44, thereby achieving precise monitoring of the battery's current and / or voltage status. If the voltage of the electrode assembly 200 is too high or too low, the battery management system can take measures such as cutting off the charging or discharging circuit to prevent the electrode assembly 200 from being overcharged or over-discharged, thereby avoiding safety accidents such as thermal runaway, combustion, and explosion of the battery.

[0084] This utility model embodiment also proposes a battery pack, which includes:

[0085] Box;

[0086] The data acquisition component is located within the enclosure;

[0087] Multiple individual cells, as described above, are housed inside the casing, and the acquisition boards 400 of all individual cells are communicatively connected to the acquisition components.

[0088] The specific structure of the single battery cell is as described in the above embodiments. Since this battery pack adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0089] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A single-cell battery, characterized in that, The single cell, having a third-party orientation, comprises: A housing having a receiving cavity; An electrode assembly disposed in the accommodating cavity; A top cover assembly, the top cover assembly including a top cover and a lower plastic, the top cover being connected to the housing and sealing the receiving cavity, the lower plastic being connected to the top cover and located on the side of the top cover facing the electrode assembly, the lower plastic having a first side facing the electrode assembly in the third direction; A temperature acquisition plate having a temperature acquisition unit is disposed on the lower plastic and is located between the first side and the electrode assembly in the third direction.

2. The single-cell battery according to claim 1, characterized in that, The first side of the lower plastic is provided with a first reinforcing rib, and the first reinforcing rib surrounds and forms a first mounting groove with the opening facing the electrode assembly, and the acquisition plate is accommodated in the first mounting groove.

3. The single-cell battery according to claim 1, characterized in that, The first side of the lower plastic is provided with a first boss and a second reinforcing rib. The first boss has a first sidewall, and the second reinforcing rib is connected to the first sidewall so that the second reinforcing rib and the first boss enclose a second mounting groove with the opening facing the electrode assembly. The acquisition plate is accommodated in the second mounting groove.

4. The single-cell battery according to claim 1, characterized in that, The top cover assembly further includes a positive electrode post and a negative electrode post arranged at intervals. The positive electrode post and the negative electrode post are both inserted through the top cover and the lower plastic, and the positive electrode post and the negative electrode post are both electrically connected to the electrode assembly. The acquisition board is connected to a first acquisition line and a second acquisition line. The first acquisition line is electrically connected to the positive terminal, and the second acquisition line is electrically connected to the negative terminal, for acquiring current and / or voltage.

5. The single-cell battery according to claim 4, characterized in that, The single battery cell also has a first direction perpendicular to the third direction. The lower plastic includes a first plastic plate and a second plastic plate. The second plastic plate is connected to the first plastic plate along the first direction. The positive electrode post passes through the first plastic plate, and the negative electrode post passes through the second plastic plate. The number of the acquisition board is one, which is disposed on one of the first plastic plate and the second plastic plate, and the acquisition board is electrically connected to both the positive terminal and the negative terminal; or, the number of the acquisition board is two, one of which is disposed on the first plastic plate and electrically connected to the positive terminal, and the other of which is disposed on the second plastic plate and electrically connected to the negative terminal, and the two acquisition boards are electrically connected to each other.

6. The single-cell battery according to any one of claims 1 to 5, characterized in that, The lower plastic is provided with a plurality of first through holes, which are opened through the third direction. On a plane perpendicular to the third direction, the orthographic projection of the acquisition plate covers at least a portion of the plurality of first through holes.

7. The single-cell battery according to claim 1, characterized in that, The first side of the lower plastic is provided with a second protrusion, and the second protrusion is provided with a third mounting groove, in which the collection plate is accommodated.

8. The single-cell battery according to claim 7, characterized in that, The second protrusion is provided with a plurality of second through holes communicating with the third mounting groove. On a plane perpendicular to the third direction, the orthographic projection of the acquisition board covers at least a portion of the plurality of second through holes. The second boss is provided with a groove cover, which covers the third mounting groove.

9. The single-cell battery according to claim 8, characterized in that, The single cell also has a first direction, the second protrusion has a first platform and a second platform, the first platform faces the electrode assembly in the third direction, the second platform is the surface of the second protrusion in the first direction, and the second platform is connected to the first platform; a plurality of second through holes are located on the first platform, and the slot of the third mounting groove is located on the second platform; The top cover assembly further includes a positive electrode post and a negative electrode post spaced apart. The positive electrode post and the negative electrode post are both inserted through the top cover and the lower plastic. The positive electrode post and the negative electrode post are both electrically connected to the electrode assembly. The acquisition board is connected to a third acquisition line and a fourth acquisition line. The slot cover is provided with a first wire through hole and a second wire through hole. The third acquisition line is inserted through the first wire through hole and electrically connected to the positive electrode post. The fourth acquisition line is inserted through the second wire through hole and electrically connected to the negative electrode post.

10. A battery pack, characterized in that, include: Box; The data acquisition component is located inside the enclosure; Multiple individual batteries as described in any one of claims 1 to 9 are disposed within the housing, and the acquisition boards of all the individual batteries are communicatively connected to the acquisition component.

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