Single battery and battery pack

Abstract

The utility model discloses a single battery, which has a first direction, a second direction and a third direction which are intersected pairwise, and comprises a shell, a battery cell and a battery cell, the electrode assembly is arranged in the accommodating cavity and comprises a main body part, a positive tab and a negative tab, and the positive tab and the negative tab are electrically connected with the main body part; the top cover assembly comprises a top cover piece, a positive pole and a negative pole, the top cover piece is connected with the shell and covers the containing cavity, the positive pole and the negative pole penetrate through the top cover piece in the third direction, at least one of the positive pole and the negative pole is insulated from the top cover piece, the positive pole is electrically connected with the positive lug, and the negative pole is electrically connected with the negative lug; the collecting assembly is located in the containing cavity and comprises a protective shell, a collecting plate and a buffer part, the protective shell is arranged on the shell or the main body part, the protective shell is provided with a protective cavity, the collecting plate and the buffer part are both located in the protective cavity, the collecting plate is further electrically connected with the electrode assembly, and the buffer part is arranged between the collecting plate and the protective shell. The acquisition board in the single battery is not easy to damage.

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 data collected from battery cells. This results in cables running between cells and between cells and the control device, placing a heavy load on the vehicle and affecting its driving range. Therefore, wireless BMS has emerged. Wireless BMS transmits 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] In the relevant wireless BMS architecture, data acquisition devices (such as voltage and temperature) are set inside the battery cell to collect battery cell information. However, the acquisition devices are usually exposed. When the battery cell is used, transported or subjected to external impact, the internal acquisition devices are easily damaged by collisions or squeezing, which affects normal operation and may even cause serious safety hazards such as short circuits. Utility Model Content

[0005] The main purpose of this invention is to propose a single-cell battery that aims to solve the technical problem that the acquisition devices in the existing wireless BMS architecture of battery cells are easily damaged when subjected to collisions or pressure.

[0006] To achieve the above objectives, this utility model proposes a single-cell battery having intersecting first, second, and third directions, the single-cell battery comprising:

[0007] A housing having a receiving cavity;

[0008] An electrode assembly is disposed within the receiving cavity. The electrode assembly includes a main body, a positive electrode tab, and a negative electrode tab, both of which are electrically connected to the main body.

[0009] A top cover assembly includes a top cover plate, a positive terminal, and a negative terminal. The top cover plate is connected to the housing and covers the receiving cavity. The positive terminal and the negative terminal are both disposed through the top cover plate in a third direction. At least one of the positive terminal and the negative terminal is insulated from the top cover plate. The positive terminal is electrically connected to the positive tab, and the negative terminal is electrically connected to the negative tab.

[0010] A data acquisition component is located in the receiving cavity. The data acquisition component includes a protective shell, a data acquisition plate, and a buffer. The protective shell is disposed in the housing or the main body and has a protective cavity. The data acquisition plate and the buffer are both located in the protective cavity. The data acquisition plate is also electrically connected to the electrode assembly, and the buffer is disposed between the data acquisition plate and the protective shell.

[0011] In some embodiments, the buffer is made of a phase change material; and / or, the buffer covers the acquisition plate.

[0012] In some embodiments, the main body portion is provided with at least two, each main body portion having a positive electrode tab and a negative electrode tab, and all the main body portions are stacked along the second direction; the acquisition assembly further includes a first wire and a second wire, both electrically connected to the acquisition board, the first wire and the second wire passing through the buffer and the protective shell; the electrode assembly further includes a positive electrode connecting piece and a negative electrode connecting piece, the positive electrode connecting piece being electrically connected to the positive electrode post, the negative electrode connecting piece being electrically connected to the negative electrode post, all the positive electrode tabs being electrically connected to the positive electrode connecting piece, and all the negative electrode tabs being electrically connected to the negative electrode connecting piece;

[0013] One of the positive electrode tab and the negative electrode tab of any of the main body portions is electrically connected to the first wire, and the other is electrically connected to the second wire; or, the first wire is electrically connected to the positive electrode connecting piece, and the second wire is electrically connected to the negative electrode connecting piece.

[0014] In some embodiments, the buffer member has a first through hole and a second through hole, the first wire passes through the first through hole, and the second wire passes through the second through hole; a first sealing element is provided between the first wire and the wall of the first through hole, and a second sealing element is provided between the second wire and the wall of the second through hole; and / or

[0015] The protective shell is provided with a third through hole and a fourth through hole. The first wire passes through the third through hole and the second wire passes through the fourth through hole. A third sealing element is provided between the first wire and the wall of the third through hole, and a fourth sealing element is provided between the second wire and the wall of the fourth through hole.

[0016] In some embodiments, the main body has an arcuate surface at one end in the first direction, and the housing has a first wall in the first direction; there is a first gap between the arcuate surfaces of two adjacent main bodies and the first wall, the protective shell is disposed on the first wall, and the acquisition component is located in the first gap.

[0017] In some embodiments, there is a second gap between adjacent main body portions in the second direction, the second gap communicating with the first gap in the first direction; the first wire and the second wire extend into the second gap along the first direction, and the first wire and the second wire located in the second gap also extend towards the top cover sheet in the third direction.

[0018] In some embodiments, the first wall surface is provided with a groove, the protective shell is fixed in the groove, and a portion of the protective shell protrudes from the first wall surface in the first direction.

[0019] In some embodiments, there is a second gap between adjacent main body portions in the second direction, the acquisition component is located in the second gap, and the protective shell is connected to at least one of the adjacent main body portions.

[0020] In some embodiments, the acquisition board is provided with an acquisition module and a wireless transmission module, the acquisition module being electrically connected to the electrode assembly, and the wireless transmission module being electrically connected to the acquisition module.

[0021] This utility model also proposes a battery pack, which includes the single battery cells as described above.

[0022] In this single-cell battery, the data acquisition component includes a protective shell, a data acquisition board, and a buffer. The data acquisition board collects data from the battery cell, providing strong data support for cell status assessment, fault diagnosis, and predictive maintenance. Both the data acquisition board and the buffer are housed within the protective cavity of the protective shell. The protective shell can withstand external physical impacts, providing reliable external protection for the data acquisition board. Simultaneously, the design of the buffer further enhances the protection of the data acquisition board. When the battery is subjected to external forces such as vibration or bumps, the buffer can effectively absorb and disperse the impact force, preventing damage to the data acquisition board due to excessive stress. This not only ensures the normal operation of the data acquisition board but also improves the stability and reliability of the entire data acquisition component. This allows the data acquisition component to continuously and stably collect battery cell data even in complex operating environments, providing a solid guarantee for the stable operation of the battery management system. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a single battery cell in one embodiment of the present invention;

[0024] Figure 2 This is an exploded view of a single battery cell in one embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the data acquisition component of a single battery in one embodiment of the present invention;

[0026] Figure 4 for Figure 3 A cross-sectional view of the acquisition component in the embodiment;

[0027] Figure 5 for Figure 3 Exploded view of the acquisition component in the embodiment;

[0028] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0029] Figure 7 for Figure 5 Enlarged view of point B in the middle;

[0030] Figure 8 This is a cross-sectional view of a single battery cell in one embodiment of the present invention;

[0031] Figure 9 for Figure 8 Enlarged view of point C in the middle;

[0032] Figure 10 This is a partial structural diagram of a single battery cell in one embodiment of the present invention;

[0033] Figure 11 This is a schematic diagram of the casing of a single battery cell in one embodiment of the present invention;

[0034] Figure 12 This is an exploded view of a single cell in another embodiment of the present invention;

[0035] Figure 13 This is a cross-sectional view of a single battery cell in another embodiment of the present invention. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Reference Figure 1 This utility model embodiment proposes a single-cell battery having intersecting first directions X, second directions Y, and third directions Z. The single-cell battery involved in this embodiment is the basic unit constituting a battery pack. It is an independent electrochemical energy storage device capable of converting chemical energy into electrical energy through electrochemical reactions, or converting electrical energy into chemical energy for storage. This single-cell battery can be a prismatic battery and can be applied in fields such as electric vehicles.

[0041] A single cell has a first direction X, a second direction Y, and a third direction Z, and any two directions are intersecting. The first direction X can be the length direction of the single cell, the second direction Y can be the width / thickness direction of the single cell, and the third direction Z can be the height direction of the single cell.

[0042] Reference Figures 1 to 5 The single-cell battery includes a casing 100, an electrode assembly 200, a top cover assembly 300, and a data acquisition assembly 400. Wherein:

[0043] The housing 100 has a receiving cavity 110.

[0044] Electrode assembly 200 is disposed in receiving cavity 110. Electrode assembly 200 includes main body 210, positive electrode tab 220 and negative electrode tab 230. Both positive electrode tab 220 and negative electrode tab 230 are electrically connected to main body 210.

[0045] The top cover assembly 300 includes a top cover plate 310, a positive terminal 320, and a negative terminal 330. The top cover plate 310 is connected to the housing 100 and covers the receiving cavity 110. The positive terminal 320 and the negative terminal 330 are both disposed in the top cover plate 310 along a third direction Z. At least one of the positive terminal 320 and the negative terminal 330 is insulated from the top cover plate 310. The positive terminal 320 is electrically connected to the positive tab 220, and the negative terminal 330 is electrically connected to the negative tab 230.

[0046] The acquisition component 400 is located in the receiving cavity 110. The acquisition component 400 includes a protective shell 410, an acquisition plate 420, and a buffer 430. The protective shell 410 is disposed in the housing 100 or the main body 210. The protective shell 410 has a protective cavity 411. The acquisition plate 420 and the buffer 430 are both located in the protective cavity 411. The acquisition plate 420 is also electrically connected to the electrode assembly 200, and the buffer 430 is disposed between the acquisition plate 420 and the protective shell 410.

[0047] The casing 100 primarily protects the internal components of the battery and is typically made of metal, such as aluminum. The electrode assembly 200 is housed within the cavity 110 of the casing 100. The main body 210 of the electrode assembly 200 is the core component for realizing the battery's electrochemical reactions and typically consists of positive and negative electrode active materials, a separator, and current collectors. The positive and negative electrode active materials are selected based on the battery type and application. For example, in lithium-ion batteries, the positive electrode active material may be lithium cobalt oxide or lithium iron phosphate, while the negative electrode active material is generally graphite. The separator isolates the positive and negative electrodes, preventing short circuits while allowing lithium ions to pass through. It can be made of polypropylene or polyethylene, which have good chemical stability and mechanical strength. The positive tab 220 and negative tab 230 are generally made of highly conductive metals, such as copper or aluminum. The electrical connection between the positive tab 220 and negative tab 230 and the main body 210 can be achieved using welding processes, such as laser welding. This welding method ensures a strong and conductive connection, reduces contact resistance, and improves the battery's charge and discharge efficiency. The housing 100 also contains an electrolyte in its cavity 110, which serves as a medium for ion transport to ensure the conduction of ions inside the battery.

[0048] As a crucial component of the battery structure, the top cover assembly 300 has a top cover plate 310 positioned on top of the housing 100 to provide a sealed protection, preventing electrolyte leakage from inside the housing 100 and avoiding the entry of external space, moisture, etc., thus ensuring the stability of the internal chemical environment of the battery and maintaining its performance and lifespan. The positive electrode post 320, which passes through the top cover plate 310, is electrically connected to the positive electrode tab 220 of the electrode assembly 200, and the negative electrode post 330 is electrically connected to the negative electrode tab 230 of the electrode assembly 200. During battery use, the positive electrode post 320 and the negative electrode post 330 serve as current input and output terminals. For example, when the battery is connected to an electrical device (such as a car motor), the positive electrode post 320 outputs a positive charge, and the negative electrode post 330 outputs a negative charge, thus forming a current loop, allowing the chemical energy in the battery to be converted into electrical energy to power the electrical device.

[0049] like Figures 2 to 5 As shown, the data acquisition component 400 is located within the receiving cavity 110 and includes a protective shell 410, a data acquisition plate 420, and a buffer 430. The protective shell 410 has flexible installation position; it can be mounted on the housing 100 or the main body 210, and can be fixed using methods such as bonding, injection molding, welding, or snap-fit. The protective shell 410 has a protective cavity 411, the design of which can be precisely customized according to the size and shape of the data acquisition plate 420 and the buffer 430. For example, if the data acquisition plate 420 is rectangular, the protective cavity 411 can also be designed accordingly to fully utilize space and provide better protection. The protective shell 410 can be made of a flexible insulating material resistant to electrolytes, such as PP or PET, to improve the corrosion resistance and impact resistance of the data acquisition component 400. The data acquisition plate 420 can integrate a data acquisition chip and circuit components. The chip and circuit components work in coordination to achieve accurate acquisition of data such as battery voltage and temperature. For example, a voltage-collecting chip can monitor the potential difference between the positive and negative terminals of the battery in real time, convert the analog signal into a digital signal, and transmit it to the subsequent processing circuit; a temperature-collecting chip can sense the temperature changes inside the battery through sensors such as thermistors, and convert the temperature data into electrical signals for processing.

[0050] The buffer element 430 can be supported by materials with good cushioning properties such as rubber and silicone, but is not limited to these. For example, the buffer element 430 can also be made of elastic materials such as foam. The shape and size of the buffer element 430 can be designed according to the structure of the acquisition plate 420 and the protective shell 410. It can generally be made into a sheet or block shape and evenly distributed between the acquisition plate 420 and the protective shell 410. For example, buffer blocks can be set at the corners and / or edges of the acquisition plate 420 to achieve a uniform distribution of the buffer element 430 along the acquisition plate 420, forming a comprehensive buffer layer and effectively achieving buffer protection for the acquisition plate 420.

[0051] In this embodiment, in the single cell, the acquisition plate 420 and the buffer 430 of the acquisition component 400 are both located in the protective cavity 411 of the protective shell 410. The protective shell 410 can resist external physical impacts and provide reliable external protection for the acquisition plate 420. At the same time, the design of the buffer 430 further enhances the protection capability of the acquisition plate 420. When the battery is subjected to external forces such as vibration and bumps, the buffer 430 can effectively absorb and disperse the impact force, preventing the acquisition plate 420 from being damaged due to excessive stress. This not only ensures the normal operation of the acquisition plate 420, but also improves the stability and reliability of the entire acquisition component 400, enabling the acquisition component 400 to continuously and stably acquire cell data even in complex operating environments, providing a solid guarantee for the stable operation of the battery management system.

[0052] In some embodiments, the buffer 430 is made of a phase change material.

[0053] The buffer 430 is made of a phase change material (PCM), which is a substance that changes its state of matter while remaining at a constant temperature and can provide latent heat. The process of changing physical properties is called a phase change process, during which the PCM absorbs or releases a large amount of latent heat. In other words, PCM has unique physical properties; when a phase change occurs within a specific temperature range, it absorbs or releases a large amount of heat, accompanied by a slight change in volume. This characteristic allows the PCM, when used as the buffer 430, to not only provide physical cushioning like materials such as rubber and silicone, but also to perform thermal management functions due to temperature changes during battery operation.

[0054] For example, when the battery generates heat during high-load charging and discharging, causing the internal temperature to rise, the buffer 430 made of phase change material begins to undergo a phase change, absorbing heat and effectively reducing the rate of temperature rise inside the battery, thus preventing damage to the acquisition board 420 and other components due to overheating. Simultaneously, the change in the physical state of the phase change material during heat absorption further absorbs and disperses external impacts, enhancing the protection of the acquisition board 420. After the temperature decreases, the phase change material returns to its original state, continuing to provide reliable buffering and thermal management support for the acquisition board 420.

[0055] In some embodiments, the buffer 430 covers the acquisition plate 420. The buffer 430 is configured to cover the acquisition plate 420. Specifically, the buffer 430 completely encloses the surface of the acquisition plate 420, forming a comprehensive protective barrier. This design minimizes the direct impact of external forces on the acquisition plate 420. When the battery is subjected to impact or pressure, the buffer 430 can evenly disperse the impact force, significantly reducing the external force borne by various parts of the acquisition plate 420. Simultaneously, because the buffer 430 is tightly fitted to the acquisition plate 420, it effectively prevents the acquisition plate 420 from shifting or shaking within the protective cavity 411, avoiding damage caused by friction or collision between internal components.

[0056] Optionally, in some embodiments, the two designs described above are combined, that is, the buffer 430 is made of phase change material and also covers the acquisition plate 420. This design combines the thermal management and buffering functions of phase change material with the all-round protection advantages of the covering structure.

[0057] In some embodiments, refer to Figure 2 The main body 210 has at least two parts, each with a positive electrode tab 220 and a negative electrode tab 230. All main body parts 210 are stacked along the second direction Y. The acquisition assembly 400 also includes a first wire 441 and a second wire 442, both electrically connected to the acquisition plate 420. The first wire 441 and the second wire 442 pass through the buffer 430 and the protective shell 410. The electrode assembly 200 also includes a positive electrode connecting piece 240 and a negative electrode connecting piece 250. The positive electrode connecting piece 240 is electrically connected to the positive electrode post 320, and the negative electrode connecting piece 250 is electrically connected to the negative electrode post 330. All positive electrode tabs 220 are electrically connected to the positive electrode connecting piece 240, and all negative electrode tabs 230 are electrically connected to the negative electrode connecting piece 250.

[0058] One of the positive electrode tab 220 and the negative electrode tab 230 of any main body part 210 is electrically connected to the first wire 441 and the other is electrically connected to the second wire 442; or, the first wire 441 is electrically connected to the positive electrode connecting piece 240 and the second wire 442 is electrically connected to the negative electrode connecting piece 250.

[0059] The main body 210 can be configured in two or more layers, stacked along the second direction Y of the battery. This stacking arrangement effectively increases the battery's capacity and power density, meeting the performance requirements of different application scenarios. Furthermore, the acquisition component 400 can be effectively electrically connected to the electrode assembly 200 via the first wire 441 and the second wire 442, enabling accurate acquisition of various battery parameters. The electrode assembly 200 has been optimized by adding a positive electrode connecting piece 240 and a negative electrode connecting piece 250. The positive electrode connecting piece 240 is electrically connected to the positive electrode post 320, and the negative electrode connecting piece 250 is electrically connected to the negative electrode post 330. All positive electrode tabs 220 are electrically connected to the positive electrode connecting piece 240, and all negative electrode tabs 230 are electrically connected to the negative electrode connecting piece 250, thus constructing a stable and efficient current transmission path.

[0060] Regarding specific electrical connection methods, there are two situations:

[0061] Firstly, one of the positive tab 220 and the negative tab 230 of any main body portion 210 is electrically connected to the first wire 441, and the other is electrically connected to the second wire 442. For example, the positive tab 220 of any main body portion 210 is electrically connected to the first wire 441, and the negative tab 230 of the same main body portion 210 is electrically connected to the second wire 442; or, the negative tab 230 of any main body portion 210 is electrically connected to the first wire 441, and the positive tab 220 of the same main body portion 210 is electrically connected to the second wire 442. In this way, the main body portion can supply power to the acquisition board 420, enabling the acquisition board 420 to operate. Of course, the acquisition board 420 can also acquire parameters such as current and voltage of the main body portion 210.

[0062] Secondly, the first wire 441 is electrically connected to the positive electrode connector 240, and the second wire 442 is electrically connected to the negative electrode connector 250. This connection method allows for the acquisition of parameters of the positive and negative electrodes of the battery as a whole, which is suitable for application scenarios where overall battery parameters (such as current and voltage) are of great concern. At the same time, the acquisition component 400 also obtains electrical energy through its connection with the positive electrode connector 240 and the negative electrode connector 250.

[0063] As an example, when the wires of the acquisition component 400 are connected to the positive and negative tabs of a certain main body 210, power can be supplied to the acquisition component 400; when the wires of the acquisition component 400 are connected to the positive and negative connecting pieces, the acquisition component 400 can monitor data such as battery temperature, pressure, current and voltage.

[0064] In some embodiments, refer to Figures 5 to 7The buffer 430 is provided with a first through hole 431 and a second through hole 432. A first wire 441 passes through the first through hole 431 and a second wire 442 passes through the second through hole 432. A first sealing element is provided between the first wire 441 and the hole wall of the first through hole 431, and a second sealing element is provided between the second wire 442 and the hole wall of the second through hole 432.

[0065] The protective shell 410 is provided with a third through hole 413 and a fourth through hole 414. The first wire 441 passes through the third through hole 413 and the second wire 442 passes through the fourth through hole 414. A third sealing element is provided between the first wire 441 and the hole wall of the third through hole 413, and a fourth sealing element is provided between the second wire 442 and the hole wall of the fourth through hole 414.

[0066] The design of the first through hole 431 and the second through hole 432 on the buffer 430 provides a precise channel for the arrangement of the first wire 441 and the second wire 442, ensuring the orderly installation of the wires. Simultaneously, to prevent the seepage of electrolyte and other substances from inside the battery, which could cause corrosion or damage to the acquisition board 420, a first sealing element is provided between the first wire 441 and the wall of the first through hole 431, and a second sealing element is provided between the second wire 442 and the wall of the second through hole 432. The first and second sealing elements can be made of materials with good sealing performance, such as rubber sealing rings. This sealing arrangement prevents electrolyte and other substances from inside the battery from seeping into the acquisition board 420 and causing corrosion or damage, thereby effectively maintaining a stable internal environment of the battery, ensuring the normal operation of the acquisition board 420, extending the service life of the acquisition board 420, and ultimately improving the overall reliability of the battery.

[0067] Additionally, the protective shell 410 may have a third through hole 413 and a fourth through hole 414. The first wire 441 can pass through the third through hole 413, and the second wire 442 can pass through the fourth through hole 414. Furthermore, a third sealing element is provided between the first wire 441 and the wall of the third through hole 413, and a fourth sealing element is provided between the second wire 442 and the wall of the fourth through hole 414. The positions of the through holes on the protective shell 410 can be planned to ensure that the wires do not affect the structural strength of the protective shell 410 when they pass through it, while also enabling smooth connection between the wires and the external circuit. The materials of the third and fourth sealing elements are similar to those of the first and second sealing elements, both possessing good sealing performance. They can initially prevent substances such as electrolyte inside the battery from seeping into the interior of the protective shell 410, avoiding corrosion or short circuits to the acquisition board 420.

[0068] In this embodiment, the perforated structure designed on the buffer 430 and the protective shell 410 ensures the orderly arrangement of the first wire 441 and the second wire 442, reducing the possibility of damage to the wires inside the battery due to shaking, friction, etc., improving the stability of the electrical connection of the acquisition component 400, and ensuring that the acquisition board 420 can continuously and accurately acquire various parameters of the battery. Furthermore, the sealing element set between the wires and the perforation wall effectively prevents the infiltration of electrolyte and other substances inside the battery, maintaining a stable internal environment, preventing electrical faults caused by sealing problems, and improving the overall performance and safety of the battery. Good sealing and a stable working environment reduce the probability of damage to the acquisition board 420 and wires due to corrosion, short circuits, etc., extending the battery's maintenance cycle and service life.

[0069] In some embodiments, refer to Figure 2 , Figures 8 to 10 The main body 210 has an arc-shaped surface 211 at one end in the first direction X, and the housing 100 has a first wall surface 101 in the first direction X; there is a first gap W1 between the arc-shaped surface 211 of two adjacent main bodies 210 and the first wall surface 101, the protective shell 410 is disposed on the first wall surface 101, and the acquisition component 400 is located in the first gap W1.

[0070] The arc-shaped surface 211 of the main body 210 can be naturally formed after the positive and negative electrode sheets and the separator are wound into a core. When multiple main bodies 210 are stacked along the second direction Y, the arc-shaped surface 211 of two adjacent main bodies 210 and the first wall surface 101 of the housing 100 form a first gap W1. This first gap W1 provides specific space for the installation of the acquisition component 400. The protective shell 410 can be fixed to the first wall surface 101 by means such as adhesive or snap-fit, and at the same time, the acquisition component 400 is located in the first gap W1. In this way, the space inside the battery that might otherwise be wasted is fully utilized, eliminating the need for additional installation space, making the internal structure of the battery more compact, achieving a reasonable layout of more functional components within a limited volume, and making the installation and maintenance of the acquisition component 400 more convenient. When the acquisition component 400 needs to be inspected or replaced, there is no need to disassemble other components inside the battery on a large scale, reducing maintenance difficulty and cost, and improving the maintainability of the battery.

[0071] In some embodiments, refer to Figure 2 and Figure 10 There is a second gap W2 between adjacent main body parts 210 in the second direction Y, and the second gap W2 is connected to the first gap W1 in the first direction X; the first wire 441 and the second wire 442 extend into the second gap W2 along the first direction X, and the first wire 441 and the second wire 442 located in the second gap W2 also extend along the third direction Z toward the side of the top cover 310.

[0072] In this embodiment, in addition to the first gap W1, a second gap W2 is also provided between adjacent main body portions 210 in the second direction Y of the battery. The arrangement of this second gap W2 further optimizes the space utilization inside the battery. Specifically, in the first direction X of the battery, the second gap W2 communicates with the first gap W1, forming a unique internal space channel for wiring of wires.

[0073] Along the first direction X of the battery, the first wire 441 and the second wire 442 extend into the second gap W2. Furthermore, along the third direction Z of the battery, the first wire 441 and the second wire 442, located within the second gap W2, extend towards one side of the top cover plate 310. This arrangement of the wires cleverly utilizes the space formed by the connection between the second gap W2 and the first gap W1, allowing the wires to extend orderly within the battery and connect to the corresponding components. In other words, the connection between the second gap W2 and the first gap W1, and the arrangement of the wires within them, fully utilizes the space inside the battery, achieving reasonable wire routing and electrical connection between the acquisition component 400 and other components.

[0074] In some embodiments, refer to Figures 8 to 11 The first wall surface 101 is provided with a groove 1011, the protective shell 410 is fixed in the groove 1011, and a part of the protective shell 410 protrudes from the first wall surface 101 in the first direction X.

[0075] In this embodiment, the groove 1011 of the first wall surface 101 is adapted to the protective shell 410, and the protective shell 410 is fixed in the groove 1011, which can be achieved by means such as adhesive bonding or snap-fit ​​connection. The groove 1011 of the first wall surface 101 provides a precise installation position for the protective shell 410, allowing it to be firmly fixed to the shell 100. The protective shell 410 being fixed in the groove 1011 enhances its installation stability on the first wall surface 101, reducing the possibility of displacement or shaking of the entire acquisition component 400 when the battery is subjected to external forces such as vibration or impact, thereby better protecting the acquisition board 420 and ensuring that the acquisition component 400 can operate stably and reliably.

[0076] In the first direction X of the battery, a portion of the protective shell 410 protrudes from the first wall surface 101 and can be limited from one end of the main body 210 to reduce the shaking of the electrode assembly 200 along the first direction X of the battery, thereby improving the battery's shock resistance.

[0077] In some embodiments, refer to Figure 12 and Figure 13There is a second gap W2 between adjacent main body parts 210 in the second direction Y, the acquisition component 400 is located in the second gap W2, and the protective shell 410 is connected to at least one of the adjacent main body parts 210.

[0078] In the second direction Y of the battery, there is a second gap W2 between adjacent main body portions 210, which provides a new spatial option for the placement of the acquisition component 400. Placing the acquisition component 400 in the second gap W2 between adjacent main body portions 210 fully utilizes the previously underutilized space inside the battery, avoiding additional occupation of effective space and achieving a compact structural layout. The protective shell 410 is connected to at least one of the adjacent main body portions 210, that is, the protective shell 410 can be connected to one of the adjacent main body portions 210, or the protective shell 410 can be connected to all of the adjacent main body portions 210, thus fixing the acquisition component 400 inside the battery and forming a stable connection with the main body portions 210. When the battery is subjected to external forces such as vibration or impact, the acquisition component 400 can maintain a relatively stable positional relationship with the main body portions 210, reducing the possibility of displacement or shaking of the acquisition component 400, thereby ensuring that the acquisition board 420 can stably acquire data information from the battery.

[0079] In some embodiments, the acquisition board 420 includes an acquisition module and a wireless transmission module. The acquisition module is electrically connected to the electrode assembly 200, and the wireless transmission module is electrically connected to the acquisition module. The acquisition module can acquire various key data of the motor assembly in real time, such as voltage, current, and temperature, which is crucial for accurately assessing the battery's operating status and performance. The main function of the wireless transmission module is to wirelessly transmit the data acquired by the acquisition module. After the acquisition module completes data acquisition, it transmits the data to the wireless transmission module, which then sends the data to an external battery management system (BMS) or other relevant devices according to a preset wireless communication protocol.

[0080] This utility model also proposes a battery pack, which includes the single battery cells described in the foregoing embodiments. The specific structure of the single battery cell is the same as described in the foregoing embodiments. Since this battery pack adopts all the technical solutions of all the foregoing embodiments, it has at least all the technical effects brought about by the technical solutions of the foregoing embodiments, and will not be described in detail here.

[0081] 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 unit cell having a first direction, a second direction, and a third direction that intersect two by two, characterized in that, The application relates to a battery, which comprises: a shell having a containing cavity; an electrode assembly arranged in the containing cavity, the electrode assembly comprising a main body, a positive electrode lug and a negative electrode lug, the positive electrode lug and the negative electrode lug being electrically connected with the main body; a top cover assembly comprising a top cover sheet, a positive electrode post and a negative electrode post, the top cover sheet being connected with the shell and covering the containing cavity, the positive electrode post and the negative electrode post being arranged in the top cover sheet along a third direction, at least one of the positive electrode post and the negative electrode post being insulated from the top cover sheet, the positive electrode post being electrically connected with the positive electrode lug, and the negative electrode post being electrically connected with the negative electrode lug; a collecting assembly located in the containing cavity, the collecting assembly comprising a protective shell, a collecting plate and a buffer, the protective shell being arranged in the shell or the main body, the protective shell being provided with a protective cavity, the collecting plate and the buffer being arranged in the protective cavity, the collecting plate being further electrically connected with the electrode assembly, and the buffer being arranged between the collecting plate and the protective shell.

2. The cell according to claim 1, wherein The buffer is made of a phase change material; and / or the buffer covers the collecting plate.

3. The cell according to claim 1, wherein The main body is provided with at least two main bodies, each of which is provided with the positive electrode lug and the negative electrode lug, and all the main bodies are arranged in a stacking mode along a second direction; the collecting assembly further comprises a first lead wire and a second lead wire which are both electrically connected with the collecting plate, the first lead wire and the second lead wire being arranged in the buffer and the protective shell; the electrode assembly further comprises a positive electrode connecting sheet and a negative electrode connecting sheet, the positive electrode connecting sheet being electrically connected with the positive electrode post, and the negative electrode connecting sheet being electrically connected with the negative electrode post, all the positive electrode lugs being electrically connected with the positive electrode connecting sheet, and all the negative electrode lugs being electrically connected with the negative electrode connecting sheet; one of the positive electrode lug and the negative electrode lug of any one of the main bodies is electrically connected with the first lead wire, and the other one is electrically connected with the second lead wire; or the first lead wire is electrically connected with the positive electrode connecting sheet, and the second lead wire is electrically connected with the negative electrode connecting sheet.

4. The cell according to claim 3, wherein The buffer is provided with a first through hole and a second through hole, the first lead wire is arranged in the first through hole, and the second lead wire is arranged in the second through hole; a first sealing member is arranged between the first lead wire and the hole wall of the first through hole, and a second sealing member is arranged between the second lead wire and the hole wall of the second through hole; and / or the protective shell is provided with a third through hole and a fourth through hole, the first lead wire is arranged in the third through hole, and the second lead wire is arranged in the fourth through hole; a third sealing member is arranged between the first lead wire and the hole wall of the third through hole, and a fourth sealing member is arranged between the second lead wire and the hole wall of the fourth through hole.

5. The cell according to claim 3, wherein One end of the main body in the first direction has an arc-shaped surface, and the shell has a first wall surface in the first direction; the arc-shaped surfaces of two adjacent main bodies and the first wall surface have a first gap, the protective shell is arranged on the first wall surface, and the collecting assembly is located in the first gap.

6. The cell according to claim 5, wherein Second gaps are formed between the body portions in the second direction, the second gaps being communicated with the first gaps in the first direction; the first conductive lines and the second conductive lines extend into the second gaps in the first direction, and the first conductive lines and the second conductive lines in the second gaps further extend towards one side of the top cover in the third direction.

7. The cell according to claim 5, wherein The first wall surface is provided with a recess, the protective shell is fixed in the recess, and a portion of the protective shell protrudes from the first wall surface in the first direction.

8. The cell according to claim 3, wherein Second gaps are formed between the body portions in the second direction, the collection assembly is located in the second gaps, and the protective shell is connected with at least one of the adjacent body portions.

9. The monobloc cell according to any one of claims 1 to 8, characterized in that, The collection plate is provided with a collection module and a wireless transmission module, the collection module is electrically connected with the electrode assembly, and the wireless transmission module is electrically connected with the collection module.

10. A battery pack, characterized by, A single battery as claimed in any one of claims 1 to 9.

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