Battery cell, battery device and electric apparatus

Abstract

A battery cell (100), a battery device (1000) and an electric apparatus. The battery cell (100) comprises a casing (10), wherein at least one side surface of the casing (10) protrudes outwards to form an isolation portion (11); the casing (10) is further provided with a positive terminal (12), a negative terminal (13) and an explosion-proof valve (14), which are located on the same surface as the isolation portion (11); the positive terminal (12) and the negative terminal (13) are arranged on the same side of the isolation portion (11), and the explosion-proof valve (14) is arranged on the other side of the isolation portion (11); and the height of the isolation portion (11) protruding from the surface where the isolation portion is located is greater than the heights of the positive terminal (12), the negative terminal (13) and the explosion-proof valve (14) protruding from the respective surfaces where the positive terminal, the negative terminal and the explosion-proof valve are located.

Description

A battery cell, a battery device, and an electrical appliance. Related applications

[0001] This application claims priority to Chinese patent application filed on December 10, 2024, with application number 202411809476X, entitled "A Battery Cell, Battery Device and Electrical Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and electrical equipment. Background Technology

[0003] In the structure of a single battery cell, an explosion-proof valve is required to release pressure and vent air when the internal pressure of the battery cell becomes too high. However, when the explosion-proof valve releases pressure, a large amount of heat and active material is ejected from it, which can easily splash onto the positive or negative terminals of the battery cell or other electrical connection structures, leading to battery cell failure or the failure of the entire battery management system, thus affecting the battery's performance. Summary of the Invention

[0004] Based on this, this application provides a battery cell, a battery device, and an electrical appliance.

[0005] In a first aspect, this application provides a battery cell, including a housing, at least one side surface of the housing protruding outward to form an isolation portion, and the housing is also provided with a positive terminal, a negative terminal and an explosion-proof valve located on the same surface as the isolation portion, the positive terminal and the negative terminal are disposed on the same side of the isolation portion, and the explosion-proof valve is disposed on the other side of the isolation portion;

[0006] Among them, the height of the isolation part protruding from its surface is greater than the height of the positive terminal, the negative terminal, and the explosion-proof valve protruding from their respective surfaces.

[0007] By incorporating an isolation section, the battery cell serves two purposes: firstly, it acts as a barrier between the positive and negative terminals and the explosion-proof valve, reducing the probability of heat and active material splashing onto the positive and negative terminals during valve operation, thus improving the safety performance of the battery cell; secondly, the isolation section also protects the structure of the positive and negative terminals, enhancing the battery cell's shock resistance and structural stability.

[0008] In some embodiments, the housing includes a housing and a top cover covering an opening in the housing, wherein a positive terminal, a negative terminal, an explosion-proof valve, and an isolation portion are all formed on the top cover.

[0009] Therefore, the positive terminal, negative terminal, explosion-proof valve, and isolation unit are all located on the top cover, which covers the opening of the housing. This facilitates the connection of the positive terminal and negative terminal to the electrode assembly or other structures inside the battery cell, making operation convenient.

[0010] In some embodiments, the height of the isolation section is H1, the height of the positive terminal and the negative terminal are the same, both being H2, and the height of the explosion-proof valve is H3; wherein, H1 > H2 > H3, and the ratio of H1 to H2 ranges from 0.1 to 16.

[0011] In some embodiments, the ratio of H1 to H2 ranges from 0.1 to 7, thereby further improving the space utilization of individual cells in the height direction of the battery device.

[0012] In some embodiments, in a first direction, the length of the isolation portion accounts for 5% to 80% of the length of the battery cell; wherein, the first direction is the direction from the side where the positive and negative terminals are located to the side where the explosion-proof valve is located.

[0013] The above structure allows the separator to provide a larger adhesive area, improving the adhesive stability of the battery cells within the casing.

[0014] In some embodiments, in the first direction, the distance between the center point of the isolation portion and the center point of the battery cell is 0 to 47.5% of the length of the battery cell.

[0015] Therefore, by setting the center point of the isolation section within the aforementioned range, the isolation section can better accommodate the size of the positive terminal, negative terminal, explosion-proof valve, and adapter plate, and the battery cells can be better installed in the housing.

[0016] In some embodiments, in the second direction, the width of the isolation portion accounts for 50% to 100% of the width of the battery cell; wherein the second direction intersects with the first direction and the height direction of the isolation portion, respectively.

[0017] Therefore, the width of the isolation section needs to be sufficient to accommodate the adapter plate, so that the adapter plate can be smoothly connected between the positive terminal, the negative terminal, and the electrode assembly.

[0018] In some embodiments, in the second direction, the distance between the center point of the isolation portion and the center point of the battery cell is 0 to 25% of the width of the battery cell.

[0019] Therefore, by setting the center point of the isolation section within the aforementioned range, the isolation section can better adapt to the size of the adapter piece, and the battery cells can be better installed in the housing.

[0020] In some embodiments, the insulating portion is recessed on the side facing the interior of the housing to form a receiving groove.

[0021] Therefore, the containment tank can increase the internal space of the battery cell, providing more space for the electrolyte, which is beneficial to improving the performance of the battery cell and improving its cycle life.

[0022] In some embodiments, the battery cell further includes an electrode assembly disposed inside the housing, the electrode assembly including a main body and a tab disposed on the main body, the tab being electrically connected to the positive terminal and the negative terminal;

[0023] The electrode assembly includes stacked electrode assembly and wound electrode assembly.

[0024] The above structure can be adapted to electrode assemblies with different structures, and the accommodating groove formed by the isolation part can provide more space for the electrolyte, so that the electrode assembly can be fully immersed in the electrolyte, thereby improving the performance of the battery cell and the cycle life of the battery cell.

[0025] In some embodiments, the main body includes a first part and a second part, with the tab located in the first part, and the outline of the second part matching the shape of the receiving groove so that the second part can be received in the receiving groove.

[0026] This allows for full utilization of the space in the accommodating slot, further increasing the volume of the electrode assembly inside the battery cell and improving the overall energy density of the battery cell.

[0027] Secondly, this application also provides a battery device, including the battery cell as described above.

[0028] In some embodiments, the battery device further includes a housing, and the battery cells include a plurality of cells, all of which are disposed within the housing; wherein the surface of the housing protrudes outward to form protrusions that match the respective isolation portions.

[0029] In some embodiments, in a first direction, the length of the isolation portion accounts for 80% to 99% of the length of the protrusion; wherein, the first direction is the direction from the side where the positive and negative terminals are located to the side where the explosion-proof valve is located.

[0030] Thirdly, this application also provides an electrical device, including the battery device described above.

[0031] The aforementioned battery cell, battery device, and electrical equipment have an isolation section protruding from the outer casing of the battery cell. The positive and negative terminals are located on the same side of the isolation section, while the explosion-proof valve is located on the opposite side of the isolation section, opposite to the positive and negative terminals. That is, the positive and negative terminals and the explosion-proof valve are respectively located on opposite sides of the isolation section, and the height of the isolation section is greater than the height of the positive and negative terminals and the explosion-proof valve. In this way, when the explosion-proof valve releases pressure, the isolation section in the middle can block the heat and active material emitted by the explosion-proof valve, reducing the probability of damage to the electrical connection structure of the positive and negative terminals, achieving thermoelectric separation of the battery cell, and improving the safety performance of the battery cell. Attached Figure Description

[0032] 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.

[0033] Figure 1 is a schematic diagram of the structure of a battery cell according to one or more embodiments.

[0034] Figure 2 is a cross-sectional view of a battery cell according to one or more embodiments.

[0035] Figure 3 is a top view of a battery cell according to one or more embodiments.

[0036] Figure 4 is a schematic diagram of the structure of a battery cell according to one or more embodiments.

[0037] Figure 5 is a schematic diagram of the structure of a battery cell according to one or more embodiments.

[0038] Figure 6 is a schematic diagram of the structure of a battery cell according to one or more embodiments.

[0039] Figure 7 is a cross-sectional view of a battery cell according to one or more embodiments.

[0040] Figure 8 is a schematic diagram of the overall structure of a battery device according to one or more embodiments.

[0041] Figure 9 is a side view of a battery device according to one or more embodiments.

[0042] Explanation of reference numerals in the attached drawings: 1000, battery device; 100, battery cell; 200, housing; 201, protrusion; 10, outer casing; 20, electrode assembly; 11, isolation section; 12, positive terminal; 13, negative terminal; 14, explosion-proof valve; 15, housing; 16, top cover; 17, receiving groove; 21, main body; 22, electrode tab; 23, first part; 24, second part; a, first direction; b, second direction. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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 used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0050] A battery cell is the smallest unit that makes up a battery. A battery cell typically includes a casing and an electrode assembly disposed inside the casing. The casing includes a housing and a top cover. The housing has an opening, and the top cover is a sealing cover disposed at the opening of the housing. The top cover and the housing together enclose a cavity in which the electrode assembly is placed.

[0051] During the cycle of a battery cell, electrochemical reactions occur in its internal electrode components, generating heat. When the internal pressure of the battery cell becomes too high, pressure relief and venting can be achieved through the explosion-proof valve structure on the battery cell.

[0052] When the explosion-proof valve releases pressure, a large amount of heat and active material inside the battery cell will be rapidly ejected outward. During this process, it is easy for the heat to splash onto the positive terminal, negative terminal, or other electrical connection structures on the battery cell, which can easily lead to the failure of the battery cell or the failure of the entire battery management system.

[0053] Based on the above considerations, to address the problem that heat and active materials ejected during explosion-proof valve depressurization can easily splash onto the electrical connection structure of the battery cell, leading to battery cell failure or the failure of the entire battery management system, one or more embodiments of this application provide a battery cell with an isolation section protruding from its casing. The positive and negative terminals are positioned on the same side of the isolation section, while the explosion-proof valve is positioned on the opposite side of the isolation section. That is, the positive and negative terminals and the explosion-proof valve are respectively positioned on opposite sides of the isolation section, and the height of the isolation section is greater than the height of the positive and negative terminals and the explosion-proof valve. In this way, when the explosion-proof valve depressurizes and ejects, the isolation section in the middle can block the heat and active materials ejected by the explosion-proof valve, reducing the probability of damage to the electrical connection structure of the positive and negative terminals, achieving thermoelectric separation of the battery cell, and improving the safety performance of the battery cell.

[0054] It should be noted that the battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0055] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0056] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0057] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0058] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0059] Referring to Figure 1, one embodiment of this application provides a battery cell 100, including a housing 10. At least one surface of the housing 10 protrudes outward to form an isolation portion 11. The housing 10 is also provided with a positive terminal 12, a negative terminal 13, and an explosion-proof valve 14 located on the same surface as the isolation portion 11. The positive terminal 12 and the negative terminal 13 are disposed on the same side of the isolation portion 11, and the explosion-proof valve 14 is disposed on the other side of the isolation portion 11. The height of the isolation portion 11 protruding from its surface is greater than the height of the positive terminal 12, the negative terminal 13, and the explosion-proof valve 14 protruding from their respective surfaces.

[0060] It should be noted that the outer casing 10 refers to a structure that can provide housing space for the electrode assembly 20 and other structures in the battery cell 100 and play a certain protective role. The outer casing 10 is usually rectangular in shape. Therefore, the outer casing 10 has multiple surfaces. The isolation portion 11 can be provided protruding on one surface of the outer casing 10, or the isolation portion 11 can be provided protruding on two or more surfaces of the outer casing 10 at the same time.

[0061] For ease of understanding, the example given is an isolation portion 11 protruding from one surface of the outer casing 10. On the surface where the isolation portion 11 protrudes, a positive terminal 12, a negative terminal 13, and an explosion-proof valve 14 are also provided. The positive terminal 12 and negative terminal 13 are components that can be electrically connected to the electrode assembly 20 in the battery cell 100 to realize the power output and input of the battery cell 100. To facilitate electrical connection between the battery cell 100 and external structures, the positive terminal 12 and negative terminal 13 are typically protruding, forming a positive terminal and a negative terminal.

[0062] The explosion-proof valve 14 is a component that can be actuated to relieve pressure when the internal pressure of the battery cell 100 reaches a certain threshold. The explosion-proof valve 14 can be protruding from the surface of the housing 10, flush with the surface of the housing 10, or recessed from the surface of the housing 10. The specific structure can be adjusted according to the actual situation.

[0063] Specifically, the positive terminal 12 and the negative terminal 13 are arranged as a whole, and are respectively disposed on opposite sides of the isolation section 11 with the explosion-proof valve 14. Thus, the isolation section 11 can play a role in isolating the positive terminal 12, the negative terminal 13 and the explosion-proof valve 14.

[0064] Furthermore, the height of the isolation section 11 protruding from its surface is greater than the height of the positive terminal 12, the negative terminal 13, and the explosion-proof valve 14. Due to the greater height of the isolation section 11, it acts as a barrier between the positive terminal 12, the negative terminal 13, and the explosion-proof valve 14. When the explosion-proof valve 14 releases pressure and exhausts gas, the isolation section 11 can effectively prevent heat and active materials from splashing onto the positive terminal 12 or the negative terminal 13, thus protecting the structure of the positive terminal 12 and the negative terminal 13, achieving thermoelectric separation of the battery cell 100, and improving the safety performance of the battery cell 100.

[0065] In addition, due to the height of the isolation section 11, when the battery cell 100 is subjected to external impact or vibration, the external force acts on the isolation section 11 first. In this way, it can play a certain protective role for the positive terminal 12 and the negative terminal 13, reduce the probability of external impact and vibration causing damage to the positive terminal 12 and the negative terminal 13, and improve the shock resistance and structural stability of the battery cell 100.

[0066] Therefore, by providing the isolation section 11, on the one hand, it can act as a barrier between the positive terminal 12, the negative terminal 13, and the explosion-proof valve 14, reducing the probability of heat and active material splashing onto the positive terminal 12 and the negative terminal 13 during the valve spraying process, thereby improving the safety performance of the battery cell 100. On the other hand, the isolation section 11 can also protect the structure of the positive terminal 12 and the negative terminal 13, improving the shock resistance and structural stability of the battery cell 100.

[0067] Furthermore, compared with the current battery cell structure with tabs at both ends, since the isolation part 11, the positive terminal 12, the negative terminal 13 and the explosion-proof valve 14 are all located on the same surface of the housing 10, the protruding upper surface of the isolation part 11 can provide a certain adhesive area and water cooling area for the battery cell 100, which is more conducive to the heat dissipation of the battery cell 100 and improves the stability of the battery cell 100 in the housing.

[0068] In some embodiments, the housing 10 includes a housing 15 and a top cover 16 covering an opening in the housing 15, wherein the positive terminal 12, the negative terminal 13, the explosion-proof valve 14, and the isolation portion 11 are all formed on the top cover 16.

[0069] Specifically, one end of the housing 15 is open, and the top cover 16 is sealed on the opening. The housing 15 and the top cover 16 together enclose a receiving cavity, in which the electrode assembly 20 or other functional components can be placed.

[0070] The positive terminal 12, the negative terminal 13, the explosion-proof valve 14, and the isolation section 11 are all disposed on the top cover 16, and the isolation section 11 is located between the positive terminal 12, the negative terminal 13, and the explosion-proof valve 14.

[0071] The isolation section 11 can be formed by bending, stamping, or other molding methods on the top cover 16. The positive terminal 12, negative terminal 13, explosion-proof valve 14, and isolation section 11 are all disposed on the top cover 16, which covers the opening of the housing 15, facilitating the connection of the positive terminal 12 and negative terminal 13 to the electrode assembly 20 or other structures inside the battery cell 100, thus facilitating operation.

[0072] As shown in Figure 2, in some embodiments, the height of the isolation section 11 is H1, the heights of the positive terminal 12 and the negative terminal 13 are the same, both being H2, and the height of the explosion-proof valve 14 is H3 (not shown in the figure). Wherein, H1 > H2 > H3, and the ratio of H1 to H2 ranges from 0.1 to 16.

[0073] Specifically, the isolation section 11, the positive terminal 12, and the negative terminal 13 all protrude from the top cover 16, with the protrusion height of the isolation section 11 being H1, and the protrusion heights of the positive terminal 12 and the negative terminal 13 both being H2. The explosion-proof valve 14 can protrude from the top cover 16, be flush with the upper surface of the top cover 16, or be lower than the upper surface of the top cover 16, and the height of the explosion-proof valve 14 is H3, meaning that H3 can be greater than zero, equal to zero, or less than zero.

[0074] Furthermore, H1 > H2 > H3, meaning that the height of the isolation section 11 protruding from the top cover 16 is greater than the height of the positive terminal 12 and the negative terminal 13, and also greater than the height of the explosion-proof valve 14. In this way, the isolation section 11 can better play a blocking role, reducing the heat and active material splashed from the explosion-proof valve 14 onto the positive terminal 12 and the negative terminal 13.

[0075] Based on this, the ratio of H1 to H2 is set to a range of 0.1 to 16, enabling the isolation portion 11 to better isolate and protect the positive terminal 12 and the negative terminal 13. This effectively prevents heat and active materials from splashing onto the positive terminal 12 or the negative terminal 13, achieving thermoelectric separation of the battery cell 100. In some embodiments, the ratio of H1 to H2 is set to a range of 0.1 to 7. Furthermore, setting the ratio of H1 to H2 within the above range further reduces the space occupied by the isolation portion 11 in the height direction of the battery cell 100, thereby further improving the space utilization rate of the battery cell 100 in the height direction within the battery device 1000.

[0076] As shown in Figure 3, in some embodiments, in the first direction a, the length L1 of the isolation portion 11 accounts for 5% to 80% of the length L2 of the battery cell 100. Here, the first direction a is the direction from the side where the positive terminal 12 and the negative terminal 13 are located to the side where the explosion-proof valve 14 is located.

[0077] Specifically, the positive terminal 12 and the negative terminal 13 are located on the first side of the isolation section 11, and the explosion-proof valve 14 is located on the second side opposite to the first side. The first direction a is the direction from the first side to the second side. When the isolation section 11, the positive terminal 12, the negative terminal 13, and the explosion-proof valve 14 are all provided on the top cover 16, the first direction a is the length direction of the battery cell 100.

[0078] It should be noted that for a traditional battery cell 100, the top cover 16 is provided with a positive terminal 12, a negative terminal 13 and an explosion-proof valve 14. When the battery cell 100 is placed in the box to assemble a battery device, the top cover 16 cannot be glued. It can only be glued on the bottom or side of the battery cell 100 to fix the battery cell 100 in the box.

[0079] After the isolation part 11 is provided on the top cover 16, the isolation part 11 can not only act as a barrier between the positive terminal 12, the negative terminal 13 and the explosion-proof valve 14, but the top surface of the isolation part 11 can also provide a flat adhesive position. The top cover 16 can be glued through the isolation part 11, increasing the adhesive area and allowing the battery cell 100 to be placed more stably in the box.

[0080] Furthermore, the length of the separator 11 accounts for 5% to 80% of the length of the battery cell 100, ensuring that the length of the separator 11 provides sufficient adhesive area, thereby improving the adhesive stability of the battery cell 100.

[0081] Furthermore, when the battery cells 100 are installed in the housing, different battery cells 100 need to be electrically connected to each other via connectors, such as tabs. Therefore, the length of the isolation section 11 needs to be set within a suitable range so that the connectors between the battery cells 100 and the positive terminal 12 and the negative terminal 13 can be smoothly electrically connected.

[0082] With the above structure, the isolation section 11 can provide a larger adhesive area and improve the adhesive stability of the battery cell 100 in the casing.

[0083] In some embodiments, in the first direction a, the distance between the center point of the isolation portion 11 and the center point of the battery cell 100 is 0 to 47.5% of the length of the battery cell 100.

[0084] It should be noted that, due to the size of the positive terminal 12, the negative terminal 13 and the explosion-proof valve 14, the size of the adapter piece inside the battery cell 100 used to connect the electrode assembly 20 and the positive terminal 12 and the negative terminal 13, and the influence of the arrangement position of the battery cell 100 when it is placed in the box, in the first direction a, the isolation part 11 is often not centrally located on the top cover 16, but has some positional offset.

[0085] Therefore, by setting the center point of the isolation section 11 within the aforementioned range, the isolation section 11 can better adapt to the size of the positive terminal 12, the negative terminal 13, the explosion-proof valve 14, and the adapter plate, and the battery cell 100 can be better installed in the housing.

[0086] In some embodiments, in the second direction b, the width W1 of the isolation portion 11 accounts for 50% to 100% of the width W2 of the battery cell 100. The second direction b intersects with both the first direction a and the height direction of the isolation portion 11.

[0087] Specifically, the first direction a, the second direction b, and the height direction of the protrusion of the isolation part 11 are arranged perpendicular to each other. When the isolation part 11 is disposed on the top cover 16, the first direction a is the length direction of the battery cell 100, the second direction b is the width direction of the battery cell 100, and the height direction of the isolation part 11 is the height direction of the battery cell 100.

[0088] In the second direction b, the width of the isolation portion 11 will affect the setting of the adapter piece inside the battery cell 100. Therefore, the width of the isolation portion 11 needs to be able to accommodate the adapter piece smoothly so that the adapter piece can be smoothly connected between the positive terminal 12, the negative terminal 13 and the electrode assembly 20.

[0089] In some embodiments, in the second direction b, the distance between the center point of the isolation portion 11 and the center point of the battery cell 100 is 0 to 25% of the width of the battery cell 100.

[0090] Similarly, due to the size of the adapter piece and the arrangement of the battery cells 100 in the housing, in the second direction b, the isolation part 11 is often not centered on the top cover 16, but is offset to some extent.

[0091] Therefore, by setting the center point of the isolation section 11 within the aforementioned range, the isolation section 11 can better adapt to the size of the adapter piece, and the battery cell 100 can be better installed in the housing.

[0092] Please refer to Figures 1, 2 and 4 together. In some embodiments, the isolation portion 11 is recessed on the side facing the inside of the housing 10 to form a receiving groove 17.

[0093] Specifically, the isolation part 11 can be formed by bending or stamping the top cover 16. That is, the isolation part 11 is recessed on one side facing the inside of the housing 15 to form a receiving groove 17, and the isolation part 11 is protruding on one side facing the outside of the housing 15 to block between the positive terminal 12, the negative terminal 13 and the explosion-proof valve 14.

[0094] Therefore, the accommodating tank 17 can increase the internal space of the battery cell 100, providing more space for the electrolyte, which is beneficial to improving the performance of the battery cell 100 and improving the cycle life of the battery cell 100.

[0095] As shown in Figures 4 and 5, in some embodiments, the battery cell 100 further includes an electrode assembly 20 disposed inside the housing 10. The electrode assembly 20 includes a main body 21 and a tab 22 disposed on the main body 21. The tab 22 is electrically connected to the positive terminal 12 and the negative terminal 13. The electrode assembly 20 includes a stacked electrode assembly and a wound electrode assembly.

[0096] Specifically, the electrode assembly 20 refers to the component in the battery cell 100 where the actual electrochemical reaction occurs. The electrode assembly 20 is disposed within the receiving cavity formed by the housing 15 and the top cover 16. The electrode assembly 20 is formed by stacking or winding a positive electrode, an insulating portion 11, and a negative electrode. The areas on the positive and negative electrodes coated with active material are the main body 21, while the areas on the positive and negative electrodes not coated with active material are the tabs 22. Thus, the tabs 22 extend from the main body 21 and can be electrically connected to the positive terminal 12 and the negative terminal 13 via adapter tabs, realizing the output and input of the battery cell 100's electrical charge.

[0097] A laminated electrode assembly 20 refers to an electrode assembly 20 formed by sequentially stacking a positive electrode, an insulating portion 11, and a negative electrode. Therefore, a laminated electrode assembly 20 is typically rectangular. A wound electrode assembly 20 refers to an electrode assembly 20 formed by sequentially stacking a positive electrode, an insulating portion 11, and a negative electrode and then winding them around a spool. Therefore, a wound electrode assembly 20 typically has curved corners.

[0098] The electrode assembly 20 can be a stacked electrode assembly or a wound electrode assembly. Preferably, the electrode assembly 20 can be configured as a stacked electrode assembly, and the rectangular electrode assembly 20 can better fill the receiving cavity, improving the space utilization rate inside the battery cell 100.

[0099] The above structure can be adapted to electrode assemblies 20 with different structures, and the accommodating groove 17 formed by the isolation part 11 can provide more space for the electrolyte, so that the electrode assembly 20 can be fully immersed in the electrolyte, thereby improving the performance of the battery cell 100 and improving the cycle life of the battery cell 100.

[0100] As shown in Figures 6 and 7, in some embodiments, the main body 21 includes a first part 23 and a second part 24, the tab 22 is located in the first part 23, and the outline of the second part 24 matches the shape of the receiving groove 17 so that the second part 24 can be housed in the receiving groove 17.

[0101] Specifically, the electrode assembly 20 can also be configured as an irregularly shaped electrode assembly, that is, the main body 21 of the electrode assembly 20 includes a first part 23 and a second part 24 connected to each other. The first part 23 can be configured as a rectangular structure, and the tab 22 is formed in the first part 23 and electrically connected to the positive terminal 12 and the negative terminal 13.

[0102] Meanwhile, the second part 24 is disposed on one side of the first part 23, and the outline of the second part 24 matches the shape of the receiving groove 17. When the electrode assembly 20 is placed in the receiving cavity, the second part 24 can be housed in the receiving groove 17. Thus, the space of the receiving groove 17 can be fully utilized, further increasing the volume of the electrode assembly 20 inside the battery cell 100 and improving the overall energy density of the battery cell 100.

[0103] Based on the same concept as the battery cell 100 described above, this application also provides a battery device 1000, including the battery cell 100 as described above.

[0104] As shown in Figure 8, in some embodiments, the battery device 1000 further includes a housing 200, and the battery cells 100 include multiple cells, all of which are disposed within the housing 200; wherein, the surface of the housing 200 protrudes outward to form protrusions 201 that match each isolation portion 11.

[0105] Specifically, the isolation portion 11 on each battery cell 100 is located at the same position on the corresponding battery cell 100. When the battery cells 100 are installed in the housing 200, the multiple battery cells 100 are arranged into at least one group along their own thickness direction, and the isolation portions 11 on them are also arranged into at least one group. The protrusions 201 on the housing 200 are provided in a one-to-one correspondence with each group of isolation portions 11.

[0106] As shown in Figure 9, further, in the first direction a, the length L1 of the isolation part 11 accounts for 80% to 99% of the length L3 of the protrusion 201; wherein, the first direction a is the direction from the side where the positive end 12 and the negative end 13 are located to the side where the explosion-proof valve 14 is located.

[0107] With the above structure, when the battery device 100 is installed on an electrical device, such as when the battery device 100 is installed on a vehicle, the protrusion 201 and the isolation portion 11 can be adapted to the vehicle structure. As a result, not only can the space utilization rate of the battery device 1000 in the height direction be improved, but the structural strength of the battery device 1000 and the battery cell 100 can also be enhanced.

[0108] Based on the same concept as the battery device described above, this application also provides an electrical device including the battery device 1000 as described above.

[0109] According to one or more embodiments, in use, the top cover 16 can be bent or stamped to form the isolation portion 11. The isolation portion 11 protrudes outward toward the housing 15, and the side surface of the isolation portion 11 facing inward toward the housing 15 is recessed to form a receiving groove 17.

[0110] The electrode assembly 20 is placed in the housing 15, and the top cover 16 is sealed over the opening of the housing 15. The positive electrode tab of the electrode assembly 20 is electrically connected to the positive terminal 12 on the top cover 16, and the negative electrode tab is electrically connected to the negative terminal 13.

[0111] When the battery cell 100 is in normal operation, the accommodating tank 17 provides more space for the electrolyte, allowing the electrode assembly 20 to be better immersed in the electrolyte, thereby improving the performance of the battery cell 100 and extending its service life.

[0112] When the internal pressure of the battery cell 100 is too high, the explosion-proof valve 14 opens to release pressure and vent air. At this time, the gas or active material ejected from the explosion-proof valve 14 is blocked by the isolation part 11, reducing the probability of it splashing onto the positive terminal 12 and the negative terminal 13. This protects the positive terminal 12, the negative terminal 13, and other electrical connection structures of the battery cell 100, achieving thermal and electrical separation of the battery cell 100 and improving the safety performance of the battery cell 100.

[0113] In addition, when the battery cell 100 is subjected to external impact or vibration, the protruding isolation part 11 can also block the external force on the positive terminal 12 and the negative terminal 13, thereby protecting the structure of the positive terminal 12 and the negative terminal 13 from damage and further improving the structural stability of the battery cell 100.

[0114] 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.

[0115] 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 battery cell, comprising a housing, wherein at least one surface of the housing protrudes outward to form an isolation portion, and the housing is further provided with a positive terminal, a negative terminal and an explosion-proof valve located on the same surface as the isolation portion, wherein the positive terminal and the negative terminal are disposed on the same side of the isolation portion and the explosion-proof valve is disposed on the other side of the isolation portion; in, The height of the isolation part protruding from its surface is greater than the height of the positive terminal, the negative terminal, and the explosion-proof valve protruding from their respective surfaces.

2. The battery cell according to claim 1, wherein, The outer casing includes a housing and a top cover with an opening on the housing. The positive terminal, the negative terminal, the explosion-proof valve, and the isolation section are all formed on the top cover.

3. The battery cell according to claim 1 or 2, wherein, The height of the isolation section is H1, the height of the positive terminal and the height of the negative terminal are the same, both being H2, and the height of the explosion-proof valve is H3; Among them, H1 > H2 > H3, and the ratio of H1 to H2 ranges from 0.1 to 16.

4. The battery cell according to claim 3, wherein, The ratio of H1 to H2 ranges from 0.1 to 7.

5. The battery cell according to any one of claims 1-4, wherein, In a first direction, the length of the isolation portion accounts for 5% to 80% of the length of the battery cell; wherein, the first direction is the direction from the side where the positive terminal and the negative terminal are located to the side where the explosion-proof valve is located.

6. The battery cell according to claim 5, wherein, In the first direction, the distance between the center point of the isolation portion and the center point of the battery cell is 0 to 47.5% of the length of the battery cell.

7. The battery cell according to claim 5 or 6, wherein, In the second direction, the width of the isolation portion accounts for 50% to 100% of the width of the battery cell; wherein the second direction intersects with the first direction and the height direction of the isolation portion.

8. The battery cell according to claim 7, wherein, In the second direction, the distance between the center point of the isolation portion and the center point of the battery cell is 0 to 25% of the width of the battery cell.

9. The battery cell according to any one of claims 1-8, wherein, The insulating part is recessed on the side facing the inside of the outer casing to form a receiving groove.

10. The battery cell according to claim 9, wherein, The battery cell also includes an electrode assembly disposed inside the housing. The electrode assembly includes a main body and a tab disposed on the main body. The tab is electrically connected to the positive terminal and the negative terminal. The electrode assembly includes a stacked electrode assembly and a wound electrode assembly.

11. The battery cell according to claim 10, wherein, The main body includes a first part and a second part, the tab is located in the first part, and the outline of the second part matches the shape of the receiving groove so that the second part can be housed in the receiving groove.

12. A battery device comprising a battery cell as described in any one of claims 1-11.

13. The battery device according to claim 12, wherein, The battery device further includes a housing, and the battery cells include multiple cells, all of which are disposed within the housing; wherein, the surface of the housing protrudes outward to form protrusions that match each of the isolation portions.

14. The battery device according to claim 13, wherein, In a first direction, the length of the isolation portion accounts for 80% to 99% of the length of the protrusion; wherein, the first direction is the direction from the side where the positive terminal and the negative terminal are located to the side where the explosion-proof valve is located.

15. An electrical appliance comprising a battery device as described in any one of claims 12-14.

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