Battery cell, battery, and electric device

Abstract

A battery cell (20) comprises a casing (21), at least two electrode terminals (22), and an insulating member (23), the casing (21) comprising a first wall (211). The at least two electrode terminals (22) are disposed on the first wall (211), and are spaced apart from each other. The insulating member (23) is used for insulating the at least two electrode terminals (22) from the casing (21), the insulating member (23) is at least partially disposed between the two electrode terminals (22), a groove (2311) is formed in the insulating member (23), and the groove (2311) is at least partially located between two adjacent electrode terminals (22). When relative displacement occurs between the electrode terminals (22), the insulating member (23) connecting the two electrode terminals (22) is prone to being pulled. In this case, the groove (2311) achieves a good buffering effect, which facilitates preventing the insulating member (23) from cracking, thereby prolonging the service life of the insulating member (23), and further improving the safety of the battery cell (20).

Description

Battery cells, batteries and electrical devices Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to battery cells, batteries and power devices. Background Technology

[0002] With the development of modern society and the increasing environmental awareness of people, more and more devices are choosing batteries as their power source, such as mobile phones, laptops, power tools, and electric vehicles. This provides a vast space for the application and development of lithium batteries. At the same time, people are also placing higher and higher demands on battery performance, such as lifespan and safety.

[0003] The battery comprises multiple battery cells, each including a casing. Multiple electrode terminals are disposed on one side wall of the casing, and adjacent electrode terminals are positioned and isolated by an insulating component. However, for traditional battery cells, the insulating component is prone to cracking, affecting the positioning and isolation of the electrode terminals. (Utility Model Content)

[0004] Therefore, it is necessary to provide a battery cell, a battery, and an electrical device to address the problem of easy cracking of insulating components.

[0005] In a first aspect, this application provides a battery cell, the battery cell comprising:

[0006] The outer shell, including the first wall;

[0007] At least two electrode terminals are disposed on the first wall, and the at least two electrode terminals are spaced apart from each other.

[0008] An insulating element for insulating at least two electrode terminals and a housing, the insulating element being at least partially disposed between the two electrode terminals, and the insulating element having a groove at least partially located between adjacent electrode terminals.

[0009] In the technical solution of this application embodiment, at least two electrode terminals and the outer shell are insulated by setting an insulating member. By setting a groove between adjacent electrode terminals, when the insulating member is squeezed or pulled, especially when relative displacement occurs between the electrode terminals, the insulating member connecting the two electrode terminals is easily pulled. At this time, the groove plays a good buffering role, which helps to prevent the insulating member from cracking, improves the service life of the insulating member, and thus improves the safety of the battery cell.

[0010] In one embodiment, the electrode terminal includes a busbar disposed on the outside of the housing, an insulating member is at least partially disposed between adjacent busbars, and a groove is disposed between adjacent busbars.

[0011] In the technical solution of this application embodiment, insulation of adjacent busbars is achieved by providing an insulating member between them. Furthermore, a groove is provided between adjacent busbars to act as a buffer, preventing the insulating member from cracking when relative displacement occurs between two adjacent busbars.

[0012] In one embodiment, the confluence portion includes a main body portion and a connecting portion, the connecting portion being disposed between two adjacent main bodies portions, the two main bodies portions being arranged along a first direction, the two connecting portions being arranged along a second direction, and a groove being at least partially disposed between the two connecting portions, the first direction being perpendicular to the second direction, and both the first direction and the second direction being perpendicular to the thickness direction of the first wall.

[0013] In the technical solution of this application embodiment, the two connecting parts are extended between the two main body parts by the above-described arrangement, which facilitates the subsequent connection with the wires and the arrangement of the wires. The groove is at least partially disposed between the two connecting parts. When the two busbars move relative to each other, the groove between the connecting parts can absorb a certain amount of deformation, preventing the insulating part from deforming too much with the movement of the busbars and causing cracking.

[0014] In one embodiment, a receiving space is provided on the side of the first wall facing the busbar, and an insulating part is provided in the receiving space. The groove at least partially overlaps with the main body in the thickness direction of the first wall.

[0015] In the technical solution of this application embodiment, an accommodating space is provided on the first wall to accommodate and limit the insulating component, thereby preventing the insulating component from moving freely relative to the first wall and ensuring that the insulating component stably performs its insulating function. By providing a groove that at least partially overlaps with the main body in the thickness direction of the first wall, the groove between the two connecting parts is extended to the main body, thereby increasing the range of the groove on the insulating component, improving the buffering effect, and thus improving the anti-cracking ability of the insulating component.

[0016] In one embodiment, the groove portion is disposed between the main body portion and the adjacent connecting portion.

[0017] In the technical solution of this application embodiment, by also providing a groove between the main body and the connecting part, a buffering effect is generated between the main body and the connecting part to prevent the insulating part from cracking between the main body and the connecting part.

[0018] In one embodiment, the electrode terminal further includes a pole post, and the first wall further includes a pole post lead-out hole. The pole post is partially disposed on the inner side of the first wall and partially passes through the pole post lead-out hole and is connected to the busbar.

[0019] In the technical solution of this application embodiment, by setting a pole post and having the pole post pass through the pole post lead-out hole on the first wall, the electrical connection between the battery cell and the busbar inside the housing is realized.

[0020] In one embodiment, the distance between the groove and the lead-out hole of the pole is set to 2mm-20mm.

[0021] In the technical solution of this application embodiment, within this spacing range, the pole post can be guaranteed to have good structural strength, while the groove can be guaranteed to have a good buffering effect.

[0022] In one embodiment, the bottom wall of the groove is further away from the first wall than the surface of the confluence portion facing the first wall.

[0023] In the technical solution of this application embodiment, the groove has a large depth by the above arrangement, and the groove overlaps with the confluence part in the length or width direction of the first wall, so that the groove can better play a buffering role.

[0024] In one embodiment, the depth of the groove is 15%-80% of the thickness of the insulation.

[0025] In the technical solution of this application embodiment, the above-mentioned arrangement enables the groove to play a better buffering role, while ensuring that the insulating component maintains good structural strength.

[0026] In one embodiment, the depth of the groove is set to 0mm-5mm.

[0027] In the technical solution of this application embodiment, the depth of the groove is within the above-mentioned numerical range, which can play a good buffering role.

[0028] In one embodiment, the groove is provided on the side of the insulating member facing the first wall.

[0029] In the technical solution of this application embodiment, when a battery cell is impacted by an external force, the deformation mainly occurs on the side of the insulating component facing the first wall. By setting the groove on the side of the insulating component facing the first wall, the deformation of the insulating component can be directly buffered, greatly reducing the problem of cracking on the bottom side of the insulating component.

[0030] In one embodiment, the insulating element includes a plastic body and a protrusion, the busbar is disposed on the plastic body, and the protrusion is disposed on the side of the plastic body away from the first wall, the protrusion extending beyond the surface of the electrode terminal away from the first wall.

[0031] In the technical solution of this application embodiment, by the above-mentioned arrangement, the protrusion is used to block the external conductor, preventing the electrode terminals from being short-circuited by the external conductor, thereby improving the safety of the battery cell.

[0032] In one embodiment, a groove is provided on the side of the insulating member facing away from the first wall.

[0033] In the technical solution of this application embodiment, the above-mentioned arrangement also forms a buffer effect on the side of the insulating member away from the first wall.

[0034] In one embodiment, the grooves on the side of the insulating member facing the first wall are alternately arranged with the grooves on the side facing away from the first wall.

[0035] In the technical solution of this application embodiment, by providing grooves on both sides of the insulating component and alternating the grooves on the two sides, the uniformity of the groove arrangement can be ensured, which is beneficial to improving the structural strength and buffering effect of the insulating component.

[0036] In one embodiment, the bottom of the groove is provided with rounded corners.

[0037] In the technical solution of this application embodiment, by rounding the corners at the connection between the bottom and wall of the groove, the connection between the groove walls is made smoother, which helps to further prevent cracking. Moreover, since insulating parts are generally injection molded, rounded corner design is more conducive to molding and demolding processes than right-angle design.

[0038] Secondly, this application also provides a battery comprising a plurality of battery cells as described above.

[0039] Thirdly, this application also provides an electrical device, including the battery described above.

[0040] The aforementioned battery cell, battery, and electrical device insulate at least two electrode terminals and the outer casing by providing an insulating component. By providing a groove between adjacent electrode terminals, when the insulating component is squeezed or pulled, especially when relative displacement occurs between the electrode terminals, the insulating component connecting the two electrode terminals can be easily pulled. At this time, the groove plays a good buffering role, which helps to prevent the insulating component from cracking, improves the service life of the insulating component, thereby improving the safety of the battery cell, and further improving the safety and service life of the battery and electrical device. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0042] Figure 1 is a structural schematic diagram of the vehicle provided in Embodiment 1 of this application.

[0043] Figure 2 is an exploded structural diagram of the battery provided in Embodiment 1 of this application.

[0044] Figure 3 is a three-dimensional structural diagram of a battery cell provided in Embodiment 1 of this application.

[0045] Figure 4 is a three-dimensional structural diagram of the battery terminal and insulating component provided in Embodiment 1 of this application.

[0046] Figure 5 is a bottom side structure diagram of the insulating component provided in Embodiment 1 of this application.

[0047] Figure 6 is a top view of the battery cell provided in Embodiment 1 of this application.

[0048] Figure 7 is a cross-sectional view AA of Figure 6 in Embodiment 1 of this application.

[0049] Figure 8 is a cross-sectional view of Figure 7 in Embodiment 1 of this application.

[0050] Figure 9 is an enlarged structural diagram of point C in Figure 8 of Embodiment 1 of this application.

[0051] Figure 10 is a three-dimensional structural diagram of a battery cell provided in Embodiment 2 of this application.

[0052] Figure 11 is a three-dimensional structural diagram of the battery terminal and insulating component provided in Embodiment 2 of this application.

[0053] Figure 12 is a top view of the battery cell provided in Embodiment 2 of this application.

[0054] Figure 13 is a cross-sectional view AA of Figure 12 in Embodiment 2 of this application.

[0055] Figure 14 is a BB cross-sectional view of Figure 13 in Embodiment 2 of this application.

[0056] Figure 15 is an enlarged structural diagram of point C in Figure 14 of Embodiment 2 of this application.

[0057] Explanation of reference numerals in the attached drawings: 1000, vehicle; 100, battery; 10, housing; 11, first part; 12, second part; 20, battery cell; 21, outer casing; 211, first wall; 22, electrode terminal; 221, busbar; 2210, gap; 2211, main body; 2212, connecting part; 222, terminal post; 23, insulating component; 231, plastic main body; 2311, groove; 2312, limiting groove; 2313, terminal post lead-out hole; 232, protrusion; 2321, reinforcing rib; 200, controller; 300, motor. Detailed Implementation

[0058] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0059] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0060] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0062] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0064] Example 1:

[0065] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0066] A battery typically consists of multiple battery cells. Each battery cell includes a casing and a cell housed within the casing. Multiple electrode terminals are located on one side wall of the casing. These electrode terminals extend into the casing and are electrically connected to the cell, enabling the battery cell to input and output electrical power.

[0067] Batteries generally also include insulating components. On the one hand, the insulating components provide fixation and sealing for the electrode terminals; on the other hand, the insulating components provide insulation and isolation between the electrode terminals and the casing to prevent short circuits between the electrode terminals or between the electrode terminals and the casing.

[0068] The inventors of this application have noted that batteries may be subjected to compression during transportation or use in the working environment. When compressed, the insulating components deform, and when the electrode terminals are subjected to force and undergo relative displacement, the insulating components are also stretched. Under these circumstances, traditional insulating components are highly prone to cracking, severely affecting their service life and shortening the battery's safety.

[0069] The inventors of this application discovered through research that, based on the structure of a traditional battery cell, grooves can be set in the positions of the insulating parts that are easily squeezed or stretched. These grooves absorb a certain amount of deformation, thus buffering the deformation of the insulating parts and preventing cracking during deformation.

[0070] Based on this concept, the inventors of this application have designed a battery cell, which includes a casing, at least two electrode terminals and an insulating member. The casing includes a first wall; at least two electrode terminals are disposed on the first wall and are spaced apart from each other; the insulating member is used to insulate the at least two electrode terminals and the casing, and the insulating member is at least partially disposed between the two electrode terminals. The insulating member has a groove, and the groove is at least partially located between adjacent electrode terminals.

[0071] This application also provides a battery including the aforementioned battery cells. The battery can be used, but is not limited to, in energy storage devices or electrical appliances. Energy storage devices include energy storage containers, energy storage cabinets, etc. Electrical appliances can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0072] In some embodiments, the electrical device can be a vehicle. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle; a new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device is installed inside the vehicle, and the battery device can be located at the bottom, front, or rear of the vehicle. The battery device can be used to power the vehicle; for example, the battery device can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor, and the controller can be used to control the battery device to power the motor. For example, the battery device can be used to meet the vehicle's power needs during starting, navigation, and driving.

[0073] The structure of the battery cell, battery, and power device provided in the embodiments of this application will be described below with reference to the accompanying drawings.

[0074] Please refer to Figure 1, which shows a schematic diagram of the structure of a vehicle 1000 provided in Embodiment 1 of this application. Taking the vehicle 1000 as an example, the vehicle 1000 can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is installed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0075] In some embodiments, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0076] Please refer to Figure 2, which shows an exploded structural diagram of the battery 100 provided in Embodiment 1 of this application. In some embodiments, the battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10.

[0077] The housing 10 provides a space for housing individual battery cells, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, and together define a space for housing individual battery cells. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, with the first portion 11 covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 together define the space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0078] Referring to Figure 4, in battery 100, there can be multiple battery cells 20. These multiple battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form a battery module, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0079] Please refer to Figures 3-5. Figure 3 shows a three-dimensional structural diagram of the battery cell provided in Embodiment 1 of this application; Figure 4 shows a three-dimensional structural diagram of the battery terminal and insulating component provided in Embodiment 1 of this application; Figure 5 shows a bottom side structural diagram of the insulating component provided in Embodiment 1 of this application.

[0080] The battery cell proposed in this application includes a casing 21, at least two electrode terminals 22, and an insulating member 23. The casing 21 includes a first wall 211. At least two electrode terminals 22 are disposed on the first wall 211 and are spaced apart from each other. The insulating member 23 is used to insulate the at least two electrode terminals 22 and the casing 21. The insulating member 23 is at least partially disposed between two electrode terminals 22, and a groove 2311 is provided on the insulating member 23. The groove 2311 is at least partially located between adjacent electrode terminals 22. Wherein, the insulating member 23 is used to insulate the at least two electrode terminals 22 and the casing 21, meaning that the insulating member 23 insulates any two electrode terminals 22 and also insulates any one electrode terminal 22 and the casing 21, forming insulation between all electrode terminals 22 and between all electrode terminals 22 and the casing 21.

[0081] By providing an insulating element 23 to insulate at least two electrode terminals 22 and the housing 21, and by providing a groove 2311 between adjacent electrode terminals 22, when the insulating element 23 is squeezed or pulled, especially when there is relative displacement between the electrode terminals 22, the insulating element 23 connecting the two electrode terminals 22 is easily pulled and deformed. At this time, the groove 2311 plays a good buffering role, which helps to prevent the insulating element 23 from cracking, improves the service life of the insulating element 23, and thus improves the safety of the battery cell 20.

[0082] In this embodiment, two electrode terminals 22 are provided, arranged along the length direction (first direction) of the battery cell 20, serving as the positive and negative terminals of the battery cell 20, respectively. The length direction of the battery cell 20 is specifically the X direction as shown in Figure 3. In some other embodiments, more than two electrode terminals 22 may be provided; the specific number of electrode terminals 22 is not limited here.

[0083] For example, as shown in Figure 3, the first wall 211 is a detachable top cover. By removing the first wall 211, the battery cell 20 can be placed inside the housing 21, and the electrode terminals 22 extend into the housing 21 and are electrically connected to the battery cell to realize the power input and output of the battery cell. Of course, the first wall 211 can also be other side walls of the housing 21, which is not limited here.

[0084] In some embodiments, the insulating element 23 is an integral structure that positions and insulates at least two electrode terminals 22. Compared to the traditional structure where each electrode terminal 22 has its own insulating element 23, the insulating element 23 connects at least two electrode terminals 22 into one unit, resulting in better structural strength and faster processing.

[0085] Specifically, the insulating component 23 can be made of plastic, and the electrode terminal 22 and the insulating component 23 can be integrally formed by injection molding, which is quick to process and has good structural strength.

[0086] In one embodiment, please continue to refer to Figures 3 and 4. The insulating member 23 is disposed on the outer side of the first wall 211. The insulating member 23 can be connected to the outer side of the first wall 211 by means of bonding or bolting.

[0087] As shown in Figure 3, the Y direction is the width direction of the battery (second direction). During operation, the battery is mainly subjected to compressive force in the Y direction, causing relative displacement between the electrode terminals 22 in the Y direction. This leads to tension and cracking of the insulating component 23. Research has shown that the cracks in the insulating component 23 are mainly concentrated on the bottom side. Therefore, as shown in Figures 4 and 5, a groove 2311 is provided on the side of the insulating component 23 facing the first wall 211. By providing a groove 2311 on the side of the insulating component 23 facing the first wall 211, direct buffering of the deformation of the insulating component 23 can be provided, greatly reducing the problem of cracking on the bottom side of the insulating component 23.

[0088] In one embodiment, as shown in FIG4, the electrode terminal 22 includes a busbar 221 disposed on the outside of the housing 21, an insulating member 23 is at least partially disposed between adjacent busbars 221, and a groove 2311 is disposed between adjacent busbars 221.

[0089] Insulation of adjacent busbars 221 is achieved by providing an insulating member 23 between them. Furthermore, a groove 2311 is provided between adjacent busbars 221 to act as a buffer and prevent the insulating member 23 from cracking when the two adjacent busbars 221 are relatively displaced.

[0090] Specifically, the busbar 221 is used to electrically connect with the battery cells inside the housing 21, serving as a current collector. Connecting an external wire to the busbar 221 enables electrical connection with the battery cells.

[0091] A gap 2210 is provided between adjacent busbars 221, and the insulating member 23 fills the gap 2210 to achieve insulation of the adjacent busbars 221.

[0092] In one embodiment, at least two limiting grooves 2312 are provided at intervals on the top side of the insulating member 23, and the current-collecting part 221 is disposed in the corresponding limiting groove 2312. By providing the limiting grooves 2312, the current-collecting part 221 is positioned to prevent relative movement between the current-collecting part 221 and the insulating member 23, which would cause the two current-collecting parts 221 to overlap, thereby improving the insulation effect of the insulating member 23 on the current-collecting part 221.

[0093] In one embodiment, the confluence portion 221 includes a main body portion 2211 and a connecting portion 2212. The connecting portion 2212 is disposed between two adjacent main bodies 2211. The two main bodies 2211 are arranged along a first direction, and the two connecting portions 2212 are arranged along a second direction. The groove 2311 is at least partially disposed between the two connecting portions 2212. The first direction is perpendicular to the second direction, and both the first direction and the second direction are perpendicular to the thickness direction of the first wall 211.

[0094] With the above arrangement, the two connecting portions 2212 extend between the two main body portions 2211, facilitating subsequent connection with and arrangement of wires. The groove 2311 is at least partially disposed between the two connecting portions 2212. When the two busbar portions 221 move relative to each other, the groove 2311 between the connecting portions 2212 can absorb a certain amount of deformation, preventing the insulating component 23 from cracking due to excessive deformation as the busbar portion 221 moves.

[0095] It is understood that in some other embodiments, the busbar 221 may be configured to include only the main body 2211 arranged along the X direction, and the groove 2311 described above may be provided between the two main body 2211.

[0096] Optionally, as shown in Figure 5, the width of the groove 2311 is not less than 0.5 mm to ensure a larger buffer space, thereby ensuring the anti-cracking effect.

[0097] For example, the two ends of the groove 2311 extend to the vicinity of the main body 2211 to provide a large-scale buffering effect. A safe distance is maintained between the groove 2311 and the main body 2211 to ensure the isolation and insulation effect of the insulating member 23 on the electrode terminal 22. This safe distance can be set to 0.5-1.0 mm.

[0098] Understandably, in order to achieve a better cushioning effect, the groove 2311 can be extended to the bottom of the main body 2211.

[0099] Optionally, the first wall 211 has a receiving space on the side facing the junction 221, the insulating member 23 is partially disposed in the receiving space, and the groove 2311 at least partially overlaps with the main body 2211 in the thickness direction of the first wall 211.

[0100] By providing a receiving space on the first wall 211 to accommodate and limit the insulating member 23, the insulating member 23 is prevented from moving freely relative to the first wall 211, thus ensuring that the insulating member 23 stably performs its insulating function. By providing a groove 2311 that at least partially overlaps with the main body 2211 in the thickness direction of the first wall 211, and extending the groove 2311 between the two connecting parts 2212 to the main body 2211, the setting range of the groove 2311 on the insulating member 23 is increased, thereby improving the buffering effect and thus improving the crack resistance of the insulating member 23.

[0101] In one embodiment, a groove 2311 is partially provided between the main body portion 2211 and the adjacent connecting portion 2212. By also providing a groove 2311 between the main body portion 2211 and the connecting portion 2212, a buffering effect is generated between the main body portion 2211 and the connecting portion 2212 to prevent the insulating member 23 from cracking between the main body portion 2211 and the connecting portion 2212.

[0102] Specifically, a Z-shaped gap 2210 is formed between two adjacent confluence portions 221. A straight groove 2311 may be provided only between two adjacent connecting portions 2212, or a Z-shaped groove 2311 may be provided within the gap 2210.

[0103] In one embodiment, please refer back to FIG3. The electrode terminal 22 further includes a pole post 222, and the first wall 211 and the insulating member 23 further include a pole post lead-out hole 2313. The pole post 222 is partially disposed inside the first wall 211 and partially passes through the pole post lead-out hole 2313 and is connected to the busbar 221.

[0104] By setting the pole post 222 and having the pole post 222 pass through the pole post lead-out hole 2313 on the first wall 211 and the insulating member 23, the electrical connection between the battery cell and the busbar 221 inside the housing 21 is realized.

[0105] As shown in Figure 5, in order to ensure the connection strength between the pole post 222 and the insulating component 23 and to ensure the buffering effect of the groove 2311, the distance L between the groove 2311 and the pole post lead-out hole 2313 is set to 2mm-20mm. Within this distance range, the pole post 222 can be guaranteed to have good structural strength, while the groove 2311 can play a good buffering role.

[0106] Specifically, the distance L between the groove 2311 and the electrode lead-out hole 2313 is set to 3mm-10mm, with a preferred range of 4mm-8mm. For example, the distance L can be set to 6mm.

[0107] In one embodiment, as shown in Figures 6-9, the groove 2311 is configured as a U-shaped groove, and the bottom of the groove 2311 is rounded to form a smooth groove wall surface. By rounding the corners at the connection between the bottom and the groove wall of the groove 2311, the connection between the groove walls is smoother, which helps to further prevent cracking. Moreover, the insulating part 23 is generally injection molded, and the rounded corner design is more conducive to molding and demolding processes than the right-angle design.

[0108] In one embodiment, as shown in FIG9, the bottom wall of the groove 2311 is further away from the first wall 211 than the surface of the confluence portion 221 facing the first wall 211. With the above arrangement, the groove 2311 has a greater depth, and the groove 2311 overlaps with the confluence portion in the length or width direction of the first wall 211, so that the groove 2311 can better perform the buffering function.

[0109] For example, the depth of the groove 2311 is 15%-80% of the thickness of the insulating member 23. In this way, the groove 2311 can play a better buffering role, while ensuring that the insulating member 23 maintains good structural strength.

[0110] Specifically, the depth of the groove 2311 is 20%-60% of the thickness of the insulating member 23, preferably 25%-50%. For example, the ratio of the depth of the groove 2311 to the thickness of the insulating member 23 can be set to 40%. When the depth of the groove 2311 is within the above-mentioned range, it can provide a good buffering effect.

[0111] In one embodiment, the depth of the groove 2311 is set to 0mm-5mm. For example, the depth of the groove 2311 can be set to 3mm, 4mm or 5mm. The depth of the groove 2311 should be determined according to the thickness of the insulating member 23. In principle, the greater the depth of the groove 2311, the better the buffering effect, but it generally does not exceed 5mm.

[0112] In one embodiment, the wall thickness B of the groove 2311 is set to 0.5mm-1mm. For example, the wall thickness B of the groove 2311 can be set to 0.5mm, 0.75mm or 1mm.

[0113] To further improve the insulation effect of the insulating member 23 on the busbar 221, the height of the insulating member 23 between the two busbars 221 is increased. Specifically, as shown in Figure 4, the insulating member 23 includes a plastic body 231 and a protrusion 232. The busbar 221 is disposed on the plastic body 231, and the protrusion 232 is provided on the side of the plastic body 231 away from the first wall 211. The protrusion 232 extends beyond the surface of the electrode terminal 22 away from the first wall 211. In this way, the protrusion 232 blocks external conductors, preventing the electrode terminal 22 from being short-circuited by external conductors, thereby improving the safety of the battery cell 20.

[0114] Specifically, the protrusion 232 is disposed between adjacent confluence portions 221 in a Z-shaped structure, with both ends of the protrusion 232 extending to the edge of the plastic body 231 to form a good isolation effect between adjacent body portions 2211 and connecting portions 2212.

[0115] Optionally, the plastic body 231 and the protrusion 232 are configured as a single integrated structure, which can be integrally processed by injection molding.

[0116] Furthermore, the protrusion 232 is relatively long in the X direction, which may pose a risk of skewing. To address this, a reinforcing rib 2321 is provided on a section of the protrusion 232 extending in the X direction to improve the structural strength of the protrusion 232.

[0117] In some other embodiments, the protrusion 232 may not be provided. Instead, the depth of the limiting groove 2312 may be set to be greater than the thickness of the confluence portion 221, so that the upper surface of the confluence portion 221 sinks below the plastic body 231, which can also achieve a good isolation effect.

[0118] This application embodiment also provides a battery 100, including a plurality of battery cells 20 as described above.

[0119] This application also provides an electrical device, including the battery 100 as described above.

[0120] Example 2:

[0121] As shown in Figures 10-15, Figure 10 shows a three-dimensional structural diagram of the battery cell 20 provided in Embodiment 2 of this application; Figure 11 shows a three-dimensional structural diagram of the battery terminal and insulating component provided in Embodiment 2 of this application; Figure 12 shows a top view of the battery cell provided in Embodiment 2 of this application; Figure 13 shows a cross-sectional view AA of Figure 12 of Embodiment 2 of this application; Figure 14 shows a cross-sectional view BB of Figure 13 of Embodiment 2 of this application; Figure 15 shows an enlarged structural diagram of point C in Figure 14 of Embodiment 2 of this application.

[0122] This application provides a battery cell 20 and a battery 100 including the battery cell 20, which are basically the same as those in Embodiment 1, except that:

[0123] In this embodiment of the application, as shown in Figures 10 and 11, the insulating member 23 does not include the protrusion 232. It should be noted that the insulating member 23 may also be configured to include the protrusion 232.

[0124] Referring to Figures 12-15, a groove 2311 is provided on the side of the insulating member 23 facing away from the first wall 211. When the insulating member 23 is configured to include a protrusion 232, the protrusion 232 avoids the groove 2311 on the top side surface.

[0125] By providing a groove 2311 on the side of the insulating member 23 away from the first wall 211, that is, on the upper side of the insulating member 23, which cooperates with the groove 2311 on the bottom side, the buffering effect is improved, thereby further improving the crack resistance of the insulating member 23.

[0126] Optionally, the grooves 2311 on the side of the insulating member 23 facing the first wall 211 and the grooves 2311 on the side away from the first wall 211 are alternately arranged to ensure the uniformity of the groove arrangement, which is beneficial to ensuring the structural strength and buffering effect of the insulating member 23.

[0127] In one embodiment, as shown in FIG15, a groove 2311 is provided on the side of the insulating member 23 facing away from the first wall 211, and two grooves 2311 are provided on the side of the insulating member 23 facing the first wall 211. The groove 2311 on the side of the insulating member 23 facing away from the first wall 211 is located between the two grooves 2311 on the side facing the first wall 211. Of course, the number and arrangement of the grooves 2311 are not limited to three. The number and arrangement of the grooves 2311 can be specifically designed according to the structural strength and buffering effect requirements of the insulating member 23.

[0128] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0129] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A single battery cell, comprising: The outer shell, including the first wall; At least two electrode terminals are disposed on the first wall, and the at least two electrode terminals are spaced apart from each other. An insulating element for insulating the at least two electrode terminals and the housing, the insulating element being at least partially disposed between the two electrode terminals, and the insulating element having a groove at least partially located between adjacent electrode terminals.

2. The battery cell according to claim 1, wherein, The electrode terminal includes a busbar, which is disposed on the outside of the housing. The insulating member is at least partially disposed between adjacent busbars, and the groove is disposed between adjacent busbars.

3. The battery cell according to claim 2, wherein, The confluence portion includes a main body and a connecting portion. The connecting portion is disposed between two adjacent main bodies. The two main bodies are arranged along a first direction, and the two connecting portions are arranged along a second direction. The groove is at least partially disposed between the two connecting portions. The first direction is perpendicular to the second direction, and both the first direction and the second direction are perpendicular to the thickness direction of the first wall.

4. The battery cell according to claim 3, wherein, The first wall has a receiving space on the side facing the junction, the insulating part is disposed in the receiving space, and the groove at least partially overlaps with the main body in the thickness direction of the first wall.

5. The battery cell according to claim 3, wherein, The groove portion is disposed between the main body portion and the adjacent connecting portion.

6. The battery cell according to claim 2, wherein, The electrode terminal further includes a pole post, and the first wall further includes a pole post lead-out hole. The pole post is partially disposed on the inner side of the first wall and partially passes through the pole post lead-out hole and is connected to the busbar.

7. The battery cell according to claim 6, wherein, The distance between the groove and the lead-out hole of the pole post is set to 2mm-20mm.

8. The battery cell according to any one of claims 2-7, wherein, The bottom wall of the groove is further away from the first wall than the surface of the confluence portion facing the first wall.

9. The battery cell according to claim 2, wherein, The depth of the groove is 15%-80% of the thickness of the insulating component.

10. The battery cell according to claim 9, wherein, The depth of the groove is set to 0mm-5mm.

11. The battery cell according to any one of claims 2-7, wherein, The groove is provided on the side of the insulating member facing the first wall.

12. The battery cell according to claim 11, wherein, The insulating component includes a plastic body and a protrusion. The busbar is disposed on the plastic body. The protrusion is disposed on the side of the plastic body away from the first wall. The protrusion extends beyond the surface of the electrode terminal away from the first wall.

13. The battery cell according to claim 11, wherein, The groove is provided on the side of the insulating component opposite to the first wall.

14. The battery cell according to claim 11, wherein, The grooves on the side of the insulating member facing the first wall and the grooves on the side facing away from the first wall are alternately arranged.

15. The battery cell according to claim 1, wherein, The bottom of the groove is rounded.

16. A battery comprising a plurality of battery cells as described in any one of claims 1-15.

17. An electrical device comprising the battery as claimed in claim 16.

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