A battery cell

Abstract

The utility model belongs to battery technical field, concretely relates to a battery monomer, include: shell, pole, set up in the wall portion of shell, electrode assembly, accomodate in the shell, the electrode assembly includes tab, adapter piece is set up in the shell, the adapter piece includes pole connecting portion and tab connecting portion, the pole connecting portion is connected with the pole, the tab connecting portion is connected with the tab, the tab connecting portion is distributed in the both sides of pole connecting portion along the first direction, and is connected with pole connecting portion through transition portion respectively, the flow capacity of transition portion is configured as: the utility model discloses through the accurate matching flow capacity of adapter piece and the actual demand of battery, under the premise of ensuring that the key performance of battery is not affected by process fluctuation, not only reduce the use cost of valuable material such as copper and aluminium, but also improve the energy density of battery significantly through reducing the weight and reducing the volume of adapter piece.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and specifically relates to a battery cell. Background Technology

[0002] In the development of battery technology, the shape and parameters of the internal electrical connectors of a battery cell are key factors affecting battery performance. If the shape and parameters of these connectors are not designed appropriately, the battery's overcurrent performance will fail to meet requirements, or the overcurrent capacity will be excessive, resulting in wasted material costs and reduced battery energy density. Therefore, setting the shape and parameters of the electrical connectors within a reasonable range is a pressing technical problem that needs to be solved in battery technology. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a battery cell that can make the internal structure of the battery more compact and improve the battery energy density while meeting the requirements of tab folding space and overcurrent performance.

[0004] To achieve the above and other related objectives, this utility model provides a battery cell, comprising: shell; The pole is disposed on the wall of the outer casing; An electrode assembly, housed within the housing, the electrode assembly including tabs; An adapter piece is disposed inside the housing, and the adapter piece includes a pole connection part and a pole tab connection part; The pole post connecting part is connected to the pole post, and the pole tab connecting part is connected to the pole tab; The tab connection portions are distributed on both sides of the electrode post connection portion along the first direction and are respectively connected to the electrode post connection portion through transition portions. The transition portions have the smallest flow-through cross-section compared to other areas. The flow-through cross-section is the cross-section of the adapter piece perpendicular to the first direction, where the first direction is the thickness direction of the electrode assembly. The flow capacity of the transition section Configured as: ; Among them, the It is the overcurrent requirement between the tab and the post. With the It is the numerical value corresponding to the unit A.

[0005] In an optional embodiment of this utility model, the length of the transition portion in the second direction is... Compared to other areas, the second direction is the smallest, perpendicular to the first direction and parallel to the surface of the pole connection portion. Configured as:

[0006] in, These are the numerical values ​​in mm. The current coefficient is... The value ranges from 5 to 15. T represents the thickness of the region with the smallest flow cross-section between the tab connection and the pole connection, where T is the value in mm.

[0007] In an optional embodiment of the present invention, the pole connection portion is provided with a first notch on one side in the second direction and a second notch on the other side; the opening of the first notch is provided with rounded corners on both sides, and the contours of the two ends of the second notch in the first direction are asymmetrically arranged.

[0008] In an optional embodiment of this utility model, the minimum length of the pole connecting portion in the second direction is greater than the length of the transition portion in the second direction; The depth of the first notch in the second direction is 2.5mm to 5mm, and the radius of the fillet is 0.8mm to 1.5mm; In an optional embodiment of this utility model, the depth of the second notch in the second direction is ,in This refers to the maximum length of the pole connection portion in the second direction. This is the value corresponding to the unit mm.

[0009] In an optional embodiment of this utility model, the electrode connecting portion includes a first electrode connecting portion and a second electrode connecting portion, which are distributed on both sides of the electrode post connecting portion along a first direction. The first electrode connecting portion forms a first solder mark with the electrode connecting area, and the second electrode connecting portion forms a second solder mark with the electrode connecting area. The distance between the mutually close sides of the first electrode connecting portion and the second electrode connecting portion in the first direction is... The width of a single tab connection in the first direction And the distance between the mutually distant sides of the first solder mark and the second solder mark in the first direction. Configured to satisfy:

[0010] in , , This is the value corresponding to the unit mm. This is the margin at the edge. The value ranges from 6mm to 10mm.

[0011] In an optional embodiment of this utility model, along the thickness direction of the adapter piece, the tab connection portion is farther from the electrode assembly than the post connection portion; The electrode post includes an electrode post body and an electrode post base plate connected to each other. The electrode post base plate is connected to the electrode post connecting part. The distance between the adjacent sides of the first electrode tab connecting part and the second electrode tab connecting part in the first direction is [missing information]. Configured to satisfy:

[0012] in The width of the pole base plate in the first direction is [value]. , This is the value corresponding to the unit mm.

[0013] In an optional embodiment of this utility model, the offset distance of the tab connection portion relative to the pole post connection portion in the thickness direction of the adapter piece is... Configured to satisfy:

[0014] in The thickness of the pole post base plate is given. , This is the value corresponding to the unit mm.

[0015] In an optional embodiment of this utility model, the width of the electrode connecting portion in the first direction is... The width of the electrode solder mark on the electrode connection portion in the first direction Configured to satisfy:

[0016] in and This is the value corresponding to the unit mm.

[0017] In an optional embodiment of this utility model, the center distance between the electrode tabs soldered on the two adapter pieces in the second direction is... Configured to satisfy:

[0018] in The center-to-center distance between the first electrode ear of the positive electrode and the first electrode ear of the negative electrode in the second direction. , This is the value corresponding to the unit mm, and the second direction is perpendicular to the first direction and parallel to the surface of the pole post connection.

[0019] The technical advantages of this invention are as follows: By precisely matching the overcurrent capacity of the adapter plate with the actual needs of the battery, this invention ensures that the key performance of the battery cell is not affected by process fluctuations, and constrains the various dimensional parameters of the adapter plate within a reasonable range. This avoids performance degradation caused by insufficient overcurrent capacity and effectively solves the problems of material waste and bulky structure caused by excessive redundancy in traditional designs. It not only reduces the cost of using expensive materials such as copper and aluminum, but also frees up more space for active materials inside the battery by reducing the weight and size of the adapter plate, thereby significantly improving the energy density of the battery. Attached Figure Description

[0020] Figure 1 This is a front view of the adapter plate provided in an embodiment of this utility model; Figure 2 This is a labeled view of the adapter plate provided in an embodiment of this utility model; Figure 3 This is a schematic diagram of the assembly structure of the adapter plate and the pole provided in an embodiment of this utility model; Figure 4 This is a labeled view of the assembly structure of the adapter plate and the pole provided in an embodiment of this utility model; Figure 5 This is a schematic diagram of the electrode assembly and adapter plate mating state at the electrode welding station provided in an embodiment of this utility model. Figure 6 This is a diagram illustrating the mating state of the electrode assembly and adapter plate at the electrode tab welding station provided in an embodiment of this utility model. Detailed Implementation

[0021] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0022] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0023] Existing adapter designs, due to an overemphasis on performance redundancy to ensure battery overcurrent capacity, often employ excessively large sizes and thick materials. This conservative design not only results in a significant waste of precious materials such as copper and aluminum, increasing production costs, but also causes the adapter's size and weight to exceed actual needs. This occupies internal battery space that could be used to add active materials and further increases the overall battery weight, thus limiting energy density improvements. Therefore, this invention constrains the adapter's specifications based on multiple battery performance parameters, achieving a more compact internal battery structure and improved energy density while ensuring sufficient tab folding space and overcurrent performance.

[0024] Please see Figure 1-6 As shown, the technical solution of this utility model will be described in detail below with reference to specific embodiments: Please see Figure 1 , 2 As shown, an embodiment of this utility model provides an adapter 10 for connecting the tabs and terminals 20 of a battery cell, wherein the battery cell specifically refers to a prismatic battery. The adapter 10 includes a terminal connection portion 11, a tab connection portion 12 (including a first tab connection portion and a second tab connection portion), and a transition portion 13 (including a first transition portion corresponding to the first tab connection portion and a second transition portion corresponding to the second tab connection portion). The tab connection portions 12 are distributed on both sides of the terminal connection portion 11 along a first direction. The tab connection portion 12 and the terminal connection portion 11 are connected by the transition portion 13. The length of the transition portion 13 in a second direction is less than or equal to the minimum length of the terminal connection portion 11 and the tab connection portion 12 in the second direction. The second direction is perpendicular to the first direction and parallel to the surface of the terminal connection portion 11. In a specific embodiment, the first direction may be, for example, the thickness direction of the prismatic battery, i.e., the thickness direction of the electrode assembly 30 inside the battery cell, and the second direction is the length direction of the cover plate of the prismatic battery.

[0025] Specifically, the overcurrent requirement of a single battery cell is defined as follows: The unit is amperes (A). For a single battery cell of the same capacity, The current is a fixed value; the transition section 13 is the area with the smallest current-carrying cross-section in the adapter piece 10 of this utility model. Therefore, the sum of the current-carrying capacities of each transition section 13 is the current-carrying capacity of the adapter piece 10. This utility model uses... Therefore, if the length of the transition section 13 in the second direction is defined as... The unit is mm; the thickness of transition section 13 is The unit is mm; the overcurrent coefficient is When there are two electrode connecting parts 12 and two transition parts 13, the current carrying capacity of the adapter piece 10 is the sum of the current carrying capacities of the two transition parts 13, that is, the current carrying capacity of the adapter piece 10 is... The unit is A; In order to provide an appropriate performance margin while meeting overcurrent requirements, and to avoid excessive performance redundancy, this utility model limits... and satisfy Therefore, the length of the transition section 13 in the second direction Configured as:

[0026] In a specific embodiment, The possible values ​​are, for example, .

[0027] This invention precisely matches the overcurrent capacity of the adapter piece 10 with the actual needs of the battery. While ensuring that the key performance of the cell is not affected by process fluctuations, the length of the transition section 13 is constrained within a reasonable range of 0.6I1 / KT to 0.75I1 / KT. This avoids performance degradation due to insufficient overcurrent capacity and effectively solves the problems of material waste and bulky structure caused by excessive redundancy in traditional designs. This optimized design not only reduces the cost of using expensive materials such as copper and aluminum, but also frees up more space for active materials inside the battery by reducing the weight and size of the adapter piece 10, thereby significantly improving the battery's energy density.

[0028] The internal resistance (DCR) of battery cells with different adapter plates was tested below. The test results are shown in Table 1. Table 1. Test results of internal resistance variation when different adapter plates are installed on the same specification battery cell.

[0029] The battery cell specifications in the embodiments and comparative examples in Table 1 are the same, that is, the overcurrent requirements of each battery cell are the same. Since the battery specifications are identical, the influence of internal resistance is eliminated, and only the overcurrent capability of adapter 10 is verified. The impact on internal resistance; furthermore, to more intuitively distinguish the differences in the minimum current-carrying cross-section of each adapter piece 10, the thickness of the adapter pieces 10 in the above embodiments and comparative examples is... and current coefficient Similarly, only the length of transition section 13 is used. To distinguish the differences in the minimum flow cross section of each adapter piece 10.

[0030] Using the internal resistance measured in Example 1 as the reference internal resistance R0, a comparison between Example 1 and Example 2 shows that when I2 decreases from 1.3I1 to 1.2I1, the increase in internal resistance is not significant, and an increase in internal resistance of less than 3% has an acceptable impact on battery performance. Therefore, reducing the current cross-section within this range has a relatively small impact on battery performance. A comparison between Example 2 and Comparative Examples 1 and 2 shows that when I2 gradually decreases from 1.2I1, the internal resistance of the battery cell increases significantly, and the rate of increase in internal resistance also gradually increases. That is, the performance degradation caused by each unit reduction in the length of the transition section 13 becomes increasingly larger. A comparison between Example 1, Example 3, and Comparative Example 3 shows that when I2 gradually increases from 1.3I1, especially to above 1.5I1, the decrease in internal resistance of the battery cell is not significant, and the rate of decrease in internal resistance also gradually decreases. That is, the performance improvement brought by each unit increase in the length of the transition section 13 becomes increasingly smaller. Therefore, this invention limits I2 to between 1.2I1 and 1.5I1, achieving a greater performance improvement with lower material and space costs.

[0031] Please see Figure 1 , 2 As shown, in an optional embodiment of this utility model, the tab connection portion 12 is provided with a tab solder mark 121, and the width of a single tab connection portion 12 in the first direction and the width of the tab solder mark 121 on the tab connection portion 12 in the first direction are configured to satisfy:

[0032] in The width of the tab connection portion 12 in the first direction is... The width of the electrode tab solder mark 121 in the first direction, and This refers to the value when the unit is mm. In a specific embodiment, the electrode connection portion 12 includes a first electrode connection portion and a second electrode connection portion, which are distributed on both sides of the electrode post connection portion 11 along a first direction. The first electrode connection portion forms a first solder mark with the electrode connection area, and the second electrode connection portion forms a second solder mark with the electrode connection area. When When describing the first electrode connection, This describes the first solder mark, when When describing the second electrode connector, This describes the second solder mark. The present invention improves upon this by increasing the width of the tab connection portion 12. Constrained on the 121 width of the electrode tab solder mark mm to Within a reasonable range of mm, interference between the welding head and the bent part of the adapter piece 10 during ultrasonic welding is avoided, ensuring the reliability of the welding process. At the same time, it prevents material waste and weight increase caused by excessive size. While ensuring welding quality, it also takes into account production cost control and battery energy density improvement, so that the adapter piece 10 achieves a balance between structural compactness and process feasibility.

[0033] Please see Figure 1 , 2 As shown, in an optional embodiment of this utility model, the pole connecting portion 11 has a first notch 111 on one side in the second direction and a second notch 112 on the other side; the opening of the first notch 111 has rounded corners on both sides, and the contours of the two ends of the second notch 112 in the first direction are asymmetrically arranged. This utility model optimizes the positioning and installation convenience of the clamp by providing a first notch 111 with rounded corners in the pole connecting portion 11. Simultaneously, the asymmetrically designed second notch 112 reduces the weight of the adapter piece 10 to lower costs, and utilizes a beveled structure to form a foolproof design, effectively preventing assembly errors. While improving production efficiency and assembly reliability, it also addresses the needs of lightweighting and cost control, thus improving the manufacturability and functionality of the adapter piece 10.

[0034] Please see Figure 1 , 2 As shown, the minimum length of the pole connecting portion 11 in the second direction is greater than the length of the transition portion 13 in the second direction; the depth of the first notch portion 111 in the second direction is 2.5mm~5mm, and the radius of the rounded corner is 0.8mm~1.5mm; the depth of the second notch portion 112 in the second direction is... ,in This is the maximum length of the pole post connecting part 11 in the second direction. This invention ensures stable positioning of the clamp and facilitates operation by precisely controlling the depth and radius of the first notch 111; simultaneously, by limiting the depth of the second notch 112 to 15%-20% of the length of the pole post connecting part 11, effective weight reduction is achieved while maintaining structural strength. This ensures that the distance between the bottom edge of the first notch 111 and the bottom edge of the second notch 112 is always greater than the minimum width of the adapter piece 10, i.e., the length of the transition part 13. This allows the current-carrying capacity of the adapter plate 10 to be determined solely by the transition section 13, facilitating precise control of the current-carrying capacity.

[0035] Please see Figure 1 , 2As shown, in an optional embodiment of this utility model, the distance between the mutually close sides of the first electrode connecting portion and the second electrode connecting portion in the first direction, the width of a single electrode connecting portion 12 in the first direction, and the distance between the mutually distant sides of the electrode solder marks 121 (first solder mark, second solder mark) in the first direction are configured to satisfy:

[0036] in The distance between the mutually approaching sides of the tab connection 12 in the first direction is [missing information]. The width of a single electrode connector 12 in the first direction, The distance between the mutually distant sides of the electrode tab solder mark 121 in the first direction. This is the margin at the edge. The value ranges from 6mm to 10mm. , , This refers to the value in mm. This invention establishes a constraint relationship between the total width of the adapter piece 10 and the outer spacing of the solder mark, providing necessary process tolerance space for solder mark positioning while ensuring edge allowance, thus guaranteeing welding accuracy; secondly, it controls... The size is effectively adjusted to adjust the height of the tab from the diaphragm, which avoids the decrease in winding yield and poor bending morphology caused by excessively long tabs, and also prevents... The risk of vibration tearing caused by insufficient redundancy of the inner tab when the size is too large is balanced with the welding processability, tab shape control and structural reliability, so that the adapter piece 10 can meet the requirements of manufacturing yield and long-term use stability at the same time.

[0037] Please see Figure 1 , 2 As shown in Figures 3 and 4, in an optional embodiment of this utility model, the electrode post connection 11, the electrode tab connection 12, and the transition portion 13 are integrally formed by a stamping process. This utility model, by using a stamping process to integrally form the electrode post connection 11, the electrode tab connection 12, and the transition portion 13, significantly improves the stability and reliability of current conduction. Simultaneously, the integral structure has higher mechanical strength and dimensional consistency. While ensuring the overall structural precision of the adapter piece 10, it simplifies the production process, reducing manufacturing costs and improving product yield.

[0038] Please see Figure 3 , 4As shown in Figures 5 and 6, this utility model also provides a battery cell, including a housing, an electrode assembly 30, a terminal post 20, and an adapter plate 10; the electrode assembly 30 is housed in the housing, and at least one end of the electrode assembly 30 is provided with a tab; the terminal post 20 is disposed on the wall of the housing; the adapter plate 10 is housed in the housing, the tab connecting part 12 is connected to the tab, and the terminal post connecting part 11 is connected to the terminal post 20.

[0039] The pole post 20 includes a pole post body 21 and a pole post base plate 22 connected to each other. The pole post base plate 22 is connected to the pole post connecting part 11. The distance between the mutually proximal sides of the pole tab connecting parts 12 in the first direction is configured to satisfy the following:

[0040] in The distance between the mutually approaching sides of the tab connection 12 in the first direction is [missing information]. The width of the pole base plate 22 in the first direction is... , This refers to the value in mm. This invention effectively avoids structural interference that may occur between the bent portion of the adapter piece 10 and the base plate 22 during assembly by limiting the inner spacing of the tab connection 12 to be at least 2 mm greater than the width of the terminal base plate 22. This ensures a reliable connection between the terminal 20 and the adapter piece 10 while guaranteeing a smooth assembly process. It eliminates the risk of poor assembly due to insufficient space and maintains a compact layout of the battery's internal structure.

[0041] In an optional embodiment of this utility model, the tab connection portion 12 is offset relative to the electrode post connection portion 11 in a direction away from the electrode assembly 30, and the offset distance of the tab connection portion 12 relative to the electrode post connection portion 11 in the thickness direction of the electrode post connection portion 11 is configured to satisfy:

[0042] Please see Figure 3 , 4 As shown, where The offset distance of the tab connector 12 relative to the pole post connector 11 in the thickness direction of the pole post connector 11. The thickness of the pole post base plate 22, , This refers to the value in mm. This invention precisely controls the offset distance between the tab connection 12 and the post connection 11. On one hand, it provides a 0.1mm safety gap for manufacturing tolerances, effectively preventing interference between the adapter piece 10 and the plastic under the top cover after bending, thus ensuring assembly yield. On the other hand, by maintaining necessary airflow space, it promotes heat dissipation in the high-temperature area of ​​ultrasonic welding, preventing the risk of short circuits caused by heat accumulation leading to melting of plastic parts. This design considers both the tolerance requirements of the production process and the thermal management safety of the battery cell during long-term use.

[0043] Please see Figure 5 , 6 As shown, in an optional embodiment of this utility model, the electrode tabs include a positive electrode tab 31 and a negative electrode tab 32. The electrode post 20 includes a positive electrode post connected to the positive electrode tab 31 and a negative electrode post connected to the negative electrode tab 32. Two adapter pieces 10 are provided, one adapter piece 10 connecting the positive electrode tab 31 and the positive electrode post, and the other adapter piece 10 connecting the negative electrode tab 32 and the negative electrode post. The positive electrode tab 31 and the negative electrode tab 32 are disposed at the same end of the electrode assembly 30. The electrode assembly 30 is a wound core. The positive electrode tab 31 and the negative electrode tab 32 are respectively disposed close to the two sides of the electrode assembly 30 in the second direction and avoid the bending areas on both sides of the electrode assembly 30. By disposing the positive electrode tab 31 and the negative electrode tab 32 at the same end of the electrode assembly 30 and close to the two edges of the wound core, and by using two independent adapter pieces 10 to connect the positive and negative electrode posts respectively, this utility model achieves the maximum spacing between the positive and negative electrode posts in the battery width direction, creating the optimal electrical safety distance within a limited space and effectively reducing the risk of short circuit between the positive and negative electrodes.

[0044] Please see Figure 5 , 6 As shown, in an optional embodiment of this utility model, the center distance between the first solder mark and the second solder mark in the second direction is configured to satisfy:

[0045] in The center distance in the second direction is the distance between the electrode tab solder marks 121 (first solder mark, second solder mark) on the two adapter pieces 10. The center distance between the first electrode ear of the positive electrode ear 31 and the first electrode ear of the negative electrode ear 32 in the second direction. , This refers to the value in mm. This invention achieves precise matching of the electrode welding positions by controlling the center distance of the electrode tab welding marks 121 of the two adapter pieces 10 within 95%-105% of the center distance of the positive and negative electrode tabs. This avoids the risk of electrode layer misalignment welding caused by the winding process, prevents abnormal wear caused by the ultrasonic welding head operating in areas with uneven thickness, and ensures that the welding surface is always in the ideal area with consistent electrode tab thickness. Therefore, while ensuring the stability of welding quality, it effectively controls the fluctuation of the cell's internal resistance, providing a reliable guarantee for the consistency of cell performance.

[0046] In summary, this invention precisely matches the overcurrent capacity of the adapter piece 10 with the actual needs of the battery. While ensuring that the key performance of the battery cell is not affected by process fluctuations, it constrains the various dimensional parameters of the adapter piece 10 within a reasonable range. This not only avoids performance degradation caused by insufficient overcurrent capacity, but also effectively solves the problems of material waste and bulky structure caused by excessive redundancy in traditional designs. It not only reduces the cost of using expensive materials such as copper and aluminum, but also frees up more space for active materials inside the battery by reducing the weight and size of the adapter piece 10, thereby significantly improving the energy density of the battery.

[0047] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0048] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Claims

1. A battery cell, characterized in that, include: shell; The pole is disposed on the wall of the outer casing; An electrode assembly, housed within the housing, the electrode assembly including tabs; An adapter piece is disposed inside the housing, and the adapter piece includes a pole connection part and a pole tab connection part; The pole post connecting part is connected to the pole post, and the pole tab connecting part is connected to the pole tab; The tab connection portions are distributed on both sides of the electrode post connection portion along the first direction and are respectively connected to the electrode post connection portion through transition portions. The transition portions have the smallest flow-through cross-section compared to other areas. The flow-through cross-section is the cross-section of the adapter piece perpendicular to the first direction, where the first direction is the thickness direction of the electrode assembly. The flow capacity of the transition section Configured as: ； Among them, the It is the overcurrent requirement between the tab and the post. With the It is the numerical value corresponding to the unit A.

2. The battery cell according to claim 1, characterized in that: The transition portion has the smallest length in the second direction compared to other regions. The second direction is perpendicular to the first direction and parallel to the surface of the pole post connection portion, and is configured as follows: in, These are the numerical values ​​in mm. The current coefficient is... The value ranges from 5 to 15. T represents the thickness of the region with the smallest flow cross-section between the tab connection and the pole connection, where T is the value in mm.

3. The battery cell according to claim 2, characterized in that: The pole connection portion has a first notch on one side in the second direction and a second notch on the other side; the opening of the first notch has rounded corners on both sides, and the outlines of the two ends of the second notch in the first direction are asymmetrically arranged.

4. The battery cell according to claim 3, characterized in that: The minimum length of the pole connection portion in the second direction is greater than the length of the transition portion in the second direction; The depth of the first notch in the second direction is 2.5mm to 5mm, and the radius of the rounded corner is 0.8mm to 1.5mm.

5. The battery cell according to claim 3, characterized in that: The depth of the second notch in the second direction is , where is the maximum length of the pole connection in the second direction, which is the value in mm.

6. The battery cell according to claim 1, characterized in that: The electrode tab connection includes a first electrode tab connection and a second electrode tab connection, which are distributed on both sides of the electrode post connection along a first direction. The first electrode tab connection forms a first solder mark with the electrode tab connection area, and the second electrode tab connection forms a second solder mark with the electrode tab connection area. The distance between the adjacent sides of the first electrode tab connection and the second electrode tab connection in the first direction, the width of a single electrode tab connection in the first direction, and the distance between the mutually distant sides of the first solder mark and the second solder mark in the first direction are configured to satisfy: in , , This is the value corresponding to the unit mm. This is the margin at the edge. The value ranges from 6mm to 10mm.

7. The battery cell according to claim 6, characterized in that, Along the thickness direction of the adapter piece, the tab connection portion is farther from the electrode assembly than the post connection portion; The electrode post includes an electrode post body and an electrode post base plate connected to each other. The electrode post base plate is connected to the electrode post connecting part. The distance between the adjacent sides of the first electrode tab connecting part and the second electrode tab connecting part in the first direction is [missing information]. Configured to satisfy: in The width of the pole base plate in the first direction is [value]. , This is the value corresponding to the unit mm.

8. The battery cell according to claim 7, characterized in that, The offset distance of the tab connection relative to the pole connection in the thickness direction of the adapter piece is configured to satisfy: in The thickness of the pole post base plate is given. , This is the value corresponding to the unit mm.

9. The battery cell according to claim 1, characterized in that, The width of a single tab connection in the first direction and the width of the tab solder mark provided on the single tab connection in the first direction are configured to satisfy: in and This is the value corresponding to the unit mm.

10. The battery cell according to claim 6, characterized in that, The center distance between the first solder mark and the second solder mark in the second direction Configured to satisfy: in The center-to-center distance between the first electrode ear of the positive electrode and the first electrode ear of the negative electrode in the second direction. , This is the value corresponding to the unit mm, and the second direction is perpendicular to the first direction and parallel to the surface of the pole post connection.

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