Battery cell assembly and battery monomer

Abstract

The utility model discloses a battery cell assembly and a battery monomer, and belongs to the technical field of batteries. A plurality of pole piece sets are stacked in the first direction, each pole piece set comprises a plurality of pole pieces stacked in the first direction, each pole piece comprises a current collector and a pole lug, each pole lug comprises a first section and a second section, the first end of each first section is connected to the corresponding second section, and the second end of each first section is connected to the corresponding current collector; the first ends of the first sections of the plurality of pole piece groups are folded at the folding point so as to stack the second sections of the plurality of pole piece groups, the length of the pole lug is positively correlated with the distance from the pole piece group where the pole lug is located to the folding point along the first direction, and the lengths of the pole lugs of all pole pieces in the pole piece groups are the same. The lengths of the tabs of the plurality of pole piece groups are set to be different, so that the lengths of the second sections of the plurality of folded pole piece groups tend to be consistent, and the risk of dislocation of the second sections is reduced.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery core assembly and a battery cell. Background Art

[0002] Battery cells usually use stacking technology to stack multiple pole pieces together, and the pole tabs of each layer of pole pieces are the same length. When the pole tabs of the battery cell are folded and welded, the pole tabs of the battery cell will be misaligned. Utility Model Content

[0003] The present application aims to at least solve the technical problem of tab misalignment risk existing in the related art. To this end, the present application proposes a battery cell assembly and a battery cell that can reduce the risk of tab misalignment.

[0004] In a first aspect, the present application provides a battery cell assembly, comprising:

[0005] A plurality of pole piece groups are stacked along a first direction, the pole piece group includes a plurality of pole pieces stacked along the first direction, the pole pieces include a current collector and a pole ear, the pole ear includes a first section and a second section, the first end of the first section is connected to the second section, the second end of the first section is connected to the current collector, the first ends of the first sections of the plurality of pole piece groups are converged at a convergence point so that the second sections of the plurality of pole piece groups are stacked, the length of the pole ear is positively correlated with the distance from the pole piece group where the pole ear is located to the convergence point along the first direction, and the lengths of the pole ears of each pole piece in the pole piece group are the same.

[0006] By setting the lengths of the pole tabs of the multiple pole piece groups to be different, and the farther the distance between the pole piece group and the first pole piece group, the longer the length of the pole tab, the length of the second section of the multiple pole piece groups after folding can be made consistent, reducing the risk of misalignment of the second section, thereby reducing material waste during welding of the second section and assembly interference during installation of the battery cell assembly.

[0007] According to one embodiment of the present application, the first pole piece group is the outermost pole piece group of the plurality of pole piece groups along the first direction, and the first pole piece group has two side surfaces opposite to each other along the first direction;

[0008] The convergence point has an orthographic projection on the current collector of the first electrode group along a second direction, and the orthographic projection is spaced apart from the two side surfaces along the first direction, wherein the second direction is perpendicular to the first direction.

[0009] According to one embodiment of the present application, when n is a positive integer and B<0.5T1, the following is satisfied:

[0010]

[0011] Where B is the distance between the folding point and the current collector of the pole piece on the side of the first pole piece group facing away from other pole piece groups in the first direction, T1 is the thickness of the first pole piece group, C is a coefficient, and H1 is the length of the tab of the first pole piece group. is the sum of the thicknesses of n pole piece groups in the first direction, A is the distance between the folding point and the current collector of the first pole piece group in the second direction, and H n is the length of the tab of the nth pole piece group.

[0012] According to an embodiment of the present application, when n is a positive integer and 0.5T1 ≤ B < T1, the following is satisfied:

[0013]

[0014] Where B is the distance between the folding point and the current collector of the pole piece on the side of the first pole piece group facing away from other pole piece groups in the first direction, T1 is the thickness of the first pole piece group, C is a coefficient, and H1 is the length of the tab of the first pole piece group. is the sum of the thicknesses of n pole piece groups in the first direction, A is the distance between the folding point and the current collector of the first pole piece group in the second direction, and H n is the length of the tab of the nth pole piece group.

[0015] According to an embodiment of the present application, the first pole piece group is the outermost pole piece group of the plurality of pole piece groups in the first direction, and the first pole piece group has two side surfaces opposite to each other in the first direction;

[0016] The folding point has a positive projection on the current collector of the first pole piece group in the second direction, and the positive projection coincides with the side surface of the first pole piece group facing away from other pole piece groups in the first direction, where the second direction is perpendicular to the first direction.

[0017] According to an embodiment of the present application, when n is a positive integer and B = 0, the following is satisfied:

[0018]

[0019] Where B is the distance between the folding point and the current collector of the pole piece on the side of the first pole piece group facing away from other pole piece groups in the first direction, T1 is the thickness of the first pole piece group, C is a coefficient, and H1 is the length of the tab of the first pole piece group. is the sum of the thicknesses of the n electrode sets along the first direction, A is the distance between the convergence point and the current collector of the first electrode set in the second direction, H n is the length of the pole lug of the nth pole piece group.

[0020] According to one embodiment of the present application, the convergence point has a positive projection on the current collector of one of the pole piece groups along the second direction, and the positive projection is located in the middle of the current collectors of the multiple pole piece groups along the first direction, wherein the second direction is perpendicular to the first direction.

[0021] According to one embodiment of the present application, when n is a positive integer, n≥2, In the case of meeting:

[0022] H n =C×{H m +[A 2 +B 2 ] 0.5 -[A 2 +T m 2 ] 0.5}

[0023] Wherein B is the distance between the convergence point and the current collector of the electrode on the side of the first electrode group away from the other electrode groups in the first direction, T m is the thickness of the electrode group closest to the convergence point, C is the coefficient, H m is the length of the pole lug of the pole piece group closest to the retraction point, is the sum of the thicknesses of the n electrode sets along the first direction, A is the distance between the convergence point and the current collector of the first electrode set in the second direction, H n is the length of the pole lug of the nth pole piece group.

[0024] According to one embodiment of the present application, the coefficient C satisfies: 0.85≤C≤1.15.

[0025] The coefficient C plays a role in adjusting the overall size in the formula for calculating the length of the pole lug of the pole piece group.

[0026] In a second aspect, the present application provides a battery cell, comprising:

[0027] a shell, forming a cavity;

[0028] an end cap, mounted on the housing and having an electrode terminal;

[0029] In the battery cell assembly as described in any one of the above items, the battery cell assembly is installed in the cavity, and the plurality of second sections of the battery cell assembly are electrically connected to the electrode terminals on the cover.

[0030] The battery cell can form a complete and efficient battery system through the organic combination of the shell, the end cover and the battery cell assembly, which can meet the energy storage and release requirements in various application scenarios. At the same time, the battery cell also has high safety and reliability, which can ensure the user's safety and the stable operation of the battery.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 This is one of the structural schematic diagrams of the battery cell provided in the embodiment of the present application;

[0034] Figure 2 This is one of the structural diagrams of the battery cell assembly provided in the embodiment of the present application;

[0035] Figure 3 This is the second structural diagram of the battery cell assembly provided in the embodiment of the present application;

[0036] Figure 4 This is the second structural diagram of the battery cell provided in the embodiment of the present application;

[0037] Figure 5 This is the third structural diagram of the battery cell assembly provided in the embodiment of the present application;

[0038] Figure 6 This is the third structural diagram of the battery cell provided in the embodiment of the present application;

[0039] Figure 7 This is the fourth structural diagram of the battery cell assembly provided in the embodiment of the present application;

[0040] Figure 8 This is one of the structural schematic diagrams of the electrode group of the battery cell assembly provided in the embodiment of the present application;

[0041] Figure 9 This is the second structural schematic diagram of the electrode group of the battery cell assembly provided in the embodiment of the present application.

[0042] Reference numerals:

[0043] Battery cell 1;

[0044] Battery cell assembly 10;

[0045] Pole piece assembly 110, current collector 111, pole tab 112, first section 113, second section 114;

[0046] Housing 20, cavity 210;

[0047] End cap 30, electrode terminal 310;

[0048] The first direction is X, and the second direction is Y. DETAILED DESCRIPTION

[0049] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0050] The present application aims to at least solve the technical problem of tab misalignment risk existing in the related art. To this end, the present application proposes a battery cell assembly and a battery cell that can reduce the risk of tab misalignment.

[0051] Reference below Figures 1-9 A battery cell assembly 10 according to an embodiment of the present application is described.

[0052] like Figure 1 、 Figure 2 and Figure 8 As shown, the battery cell assembly 10 includes a plurality of electrode groups 110 stacked along a first direction X, the electrode group 110 includes a plurality of electrode sheets stacked along the first direction X, the electrode sheets include a current collector 111 and a pole ear 112, the pole ear 112 includes a first section 113 and a second section 114, the first end of the first section 113 is connected to the second section 114, the second end of the first section 113 is connected to the current collector 111, the first ends of the first sections 113 of the plurality of electrode groups 110 are converged at a convergence point so that the second sections 114 of the plurality of electrode groups 110 are stacked, the length of the pole ear 112 is positively correlated with the distance from the electrode group 110 where the pole ear 112 is located to the convergence point along the first direction X, and the lengths of the pole ears 112 of each electrode in the electrode group 110 are the same.

[0053] The battery cell assembly 10 is formed by a plurality of electrode groups 110 stacked along a first direction X, where the first direction X is the height direction of the electrode, and each electrode group 110 contains a plurality of electrode groups stacked along the first direction X. By stacking the multiple layers, the total surface area of ​​the electrodes can be significantly increased while minimizing the space occupied by the battery cell assembly 10, thereby improving the energy density and power performance of the battery assembly. The multi-layer structure is also conducive to the rapid transmission of electrons and ions, thereby improving the charge and discharge rate and power output of the battery.

[0054] like Figure 8 As shown, the electrode is the basic unit of the battery cell assembly 10, which consists of a current collector 111 and a tab 112. The current collector 111 is the area coated with active material, which is used to store and release electrical energy. It is usually made by mixing active material, conductive agent and binder and then coating them on the current collector. The active material is the substance that undergoes electrochemical reaction in the battery, the conductive agent is used to improve the electronic conductivity of the active material, and the binder is used to firmly adhere the active material to the current collector.

[0055] The tab 112 is the area on the electrode that is not coated with active material, and usually includes a second section 114 and a first section 113. The second section 114 is the part that connects the electrode to the external circuit, and is usually a metal conductor extending from the current collector 111, which is used to lead the current on the electrode to the outside of the battery or other components inside the battery. The second section 114 is usually made of a metal with good conductivity, such as aluminum, nickel or copper plated with nickel, and is provided with an insulating layer to prevent short circuits. The first section 113 is the transition area between the second section 114 and the electrode body, that is, the first section 113 is located between the second section 114 and the current collector 111. The first end of the first section 113 is connected to the second section 114, and the second end is connected to the current collector 111, which is used to strengthen the reliable connection between the second section 114 and the electrode.

[0056] like Figure 2 As shown, the lengths of the pole ears 112 of different pole piece groups 110 are not the same, but are positively correlated with the distance from the pole piece group 110 where the pole ear 112 is located to the folding point along the first direction X, that is, as a certain pole piece group 110 moves away from the folding point in the first direction X, the length of the pole ear 112 of the pole piece group 110 will gradually increase. At the same time, the first end of the first section 113 of each pole piece in the multiple pole piece groups 110 is folded to the same position, so that the second sections 114 of the multiple pole piece groups 110 can be stacked, which is convenient for welding during the manufacturing process, helps to reduce the volume of the battery cell assembly 10, and improves space utilization. After folding, the lengths of the first sections 113 of the multiple pole piece groups 110 are different, while the lengths of the second sections 114 of the multiple pole piece groups 110 are the same.

[0057] It can be understood that the lengths of the pole ears 112 of different pole piece groups 110 are different, and the lengths of the pole ears 112 of each pole piece in the same pole piece group 110 are the same, which can make the lengths of the second sections 114 of the multiple pole piece groups 110 after folding tend to be consistent, thereby reducing the risk of misalignment of the second sections 114.

[0058] In the related art, after the pole pieces of the same length are folded and welded, the second section 114 will be misaligned, and the misaligned part of the second section 114 cannot be used. Usually, a longer second section 114 is used to meet the welding width requirement, resulting in material waste. At the same time, as the number of stacked second sections 114 increases, the misaligned length of the second section 114 will also become larger, which can easily cause assembly interference. In the related art, the misalignment of the second section 114 is generally handled by cutting the misaligned area, but the cutting process will introduce metal wire, resulting in an increased risk of battery failure. The present application can make the lengths of the second sections 114 of the multiple pole piece groups 110 after folding tend to be consistent, thereby reducing the risk of misalignment of the second section 114.

[0059] According to the battery cell assembly 10 provided in the embodiment of the present application, by setting the lengths of the pole tabs 112 of multiple pole piece groups 110 to be different, and the farther the distance between the pole piece group 110 and the first pole piece group 110, the longer the length of the pole tab 112 is, the length of the second section 114 of the multiple pole piece groups 110 after being folded can be made consistent, reducing the risk of misalignment of the second section 114, thereby reducing material waste during welding of the second section 114 and assembly interference during installation of the battery cell assembly 10.

[0060] During the manufacturing process, when the pole pieces of different pole piece groups 110 are of the same length, after the pole pieces of the same second section 114 length are gathered and welded, the second sections 114 of different pole piece groups 110 will be misaligned, and the misaligned parts of the second sections 114 cannot be used for welding. Usually, a longer second section 114 is used to meet the welding width requirements, but this will cause waste of material. At the same time, as the number of stacked second sections 114 increases, the misaligned length of the second section 114 will also become larger, which is easy to cause assembly interference. By adjusting the pole piece lengths of different pole piece groups 110 according to the distance from different pole piece groups 110 to the first pole piece group 110, the lengths of the second sections 114 of the multiple pole piece groups 110 after gathering can be made consistent, thereby reducing the risk of misalignment of the second section 114.

[0061] In some embodiments, the first ends of the first sections 113 of the plurality of electrode assemblies 110 are gathered at the same position, which may have various structural forms, including but not limited to:

[0062] In example 1, the first electrode group 110 is the outermost electrode group 110 of the plurality of electrode groups 110 along the first direction X, and the first electrode group 110 has two side surfaces opposite to each other along the first direction X;

[0063] The convergence point has an orthographic projection on the current collector 111 of the first electrode assembly 110 along the second direction Y, and the orthographic projection is spaced apart from the two side surfaces along the first direction X, wherein the second direction Y is perpendicular to the first direction X.

[0064] In this embodiment, if Figure 1 As shown, the projection of the folding point along the second direction Y on the current collector 111 of the first electrode group 110 is a positive projection, and the two side surfaces opposite to the current collector 111 of the first electrode group 110 along the first direction X are spaced apart along the first direction X, that is, the projection of the folding point along the second direction Y on the current collector 111 of the first electrode group 110 does not coincide with the two side surfaces of the current collector 111 of the first electrode group 110 along the first direction X, wherein the second direction Y is the length direction of the battery, and the first electrode group 110 is located at the outermost side of the multiple electrode groups 110 along the first direction X.

[0065] like Figure 2 and Figure 3 As shown, the calculation of the pole piece lengths of different pole piece groups 110 is determined based on the relationship between B and T1.

[0066] As an example, Figure 2 As shown, when n is a positive integer and B<0.5T1, it satisfies:

[0067]

[0068] Wherein B is the distance between the convergence point and the current collector 111 of the electrode of the first electrode group 110 on the side away from the other electrode groups in the first direction X, T1 is the thickness of the first electrode group 110, C is the coefficient, H1 is the length of the electrode ear 112 of the first electrode group 110, is the sum of the thicknesses of the n electrode sets 110 along the first direction X, A is the distance between the convergence point and the current collector 111 of the first electrode set 110 in the second direction Y, and H n is the length of the electrode tab 112 of the n-th electrode piece group 110 along the first direction X.

[0069] The formula is mainly divided into three items. The length of the pole ear 112 of the first pole piece group 110 is subtracted from the length of the first section 113 of the first pole piece group 110 to obtain the length of the second section 114 of the first pole piece group 110, and then the length of the first section 113 of the nth pole piece group 110 is added to obtain the length of the pole ear 112 of the nth pole piece group 110.

[0070] The coefficient C plays a role in adjusting the overall size in the formula for calculating the length of the pole lug 112 of the pole piece group 110. The value range of C is between 0.85 and 1.15. When C = 0.85, the length of the pole lug 112 of the nth pole piece group 110 along the first direction X is the minimum value that can be achieved under given other parameters. When C = 1.15, the length of the pole lug 112 of the nth pole piece group 110 along the first direction X is the maximum value that can be achieved under given other parameters.

[0071] B < 0.5T1, that is, the distance between the folding point and the current collector 111 of the electrode on the side of the first electrode group 110 facing away from the other electrode groups is less than half of the thickness of the first electrode group 110. A and B are position parameters, and the positional relationship between the folding point and the electrode group 110 is mainly represented by A and B. The coefficient C can be used to adjust H n The overall size of, and the relative positions between different electrode groups 110 are mainly represented by n and T. H1 is a base length, representing the length of the tab 112 without the influence of A and B.

[0072] As an example, as Figure 3 shown, when n is a positive integer and 0.5T1 ≤ B < T1, the following is satisfied:

[0073]

[0074] where B is the distance between the folding point and the current collector 111 of the electrode on the side of the first electrode group 110 facing away from the other electrode groups in the first direction X, T1 is the thickness of the first electrode group 110, C is the coefficient, H1 is the length of the tab 112 of the first electrode group 110, is the sum of the thicknesses of n electrode groups 110 along the first direction X, A is the distance between the folding point and the current collector 111 of the first electrode group 110 in the second direction Y, and H n is the length of the tab 112 of the nth electrode group 110 along the first direction X.

[0075] The formula is mainly divided into three terms. Subtracting the length of the first segment 113 of the first electrode group 110 from the length of the tab 112 of the first electrode group 110 gives the length of the second segment 114 of the first electrode group 110, and then adding the length of the first segment 113 of the nth electrode group 110 gives the length of the tab 112 of the nth electrode group 110.

[0076] The coefficient C plays a role in adjusting the overall size in the formula for calculating the length of the tab 112 of the electrode group 110. The value range of C is between 0.85 and 1.15. When C = 0.85, the length of the tab 112 of the nth electrode group 110 along the first direction X is the minimum value it can reach given other parameters. When C = 1.15, the length of the tab 112 of the nth electrode group 110 along the first direction X is the maximum value it can reach given other parameters.

[0077] 0.5T1 ≤ B < T1, that is, the distance between the folding point and the current collector 111 of the pole piece on the side of the first pole piece group 110 facing away from the other pole piece groups is greater than or equal to half of the thickness of the first pole piece group 110 and less than the thickness of the first pole piece group 110. A and B are position parameters, and the positional relationship between the folding point and the pole piece group 110 is mainly represented by A and B. The coefficient C can be used to adjust the overall size of H. n The relative positions between different pole piece groups 110 are mainly represented by n and T. H1 is a basic length, representing the length of the tab 112 without the influence of A and B.

[0078] It can be understood that the relative relationship between B and T, that is, the relative relationship between the distance between the folding point and the pole piece on the side of the first pole piece group 110 facing away from the other pole piece groups and the thickness of the pole piece group 110, mainly affects the calculation method of the length of the first segment 113 of the first pole piece group 110 in the formula.

[0079] Example 2: The first pole piece group 110 is the outermost pole piece group 110 of multiple pole piece groups 110 along the first direction X, and the first pole piece group 110 has two opposite side surfaces along the first direction X.

[0080] The folding point has a positive projection on the current collector 111 of the first pole piece group 110 along the second direction Y, and the positive projection coincides with the side surface of the first pole piece group 110 facing away from the other pole piece groups 110 along the first direction X, where the second direction Y is perpendicular to the first direction X.

[0081] In this embodiment, as shown in Figure 4 and Figure 5 When n is a positive integer and B = 0, it satisfies:

[0082]

[0083] where B is the distance between the folding point and the current collector 111 of the pole piece on the side of the first pole piece group 110 facing away from the other pole piece groups in the first direction X, T1 is the thickness of the first pole piece group 110, C is the coefficient, H1 is the length of the tab 112 of the first pole piece group 110, is the sum of the thicknesses of n pole piece groups 110 along the first direction X, A is the distance between the folding point and the current collector 111 of the first pole piece group 110 in the second direction Y, and H n is the length of the tab 112 of the nth pole piece group 110 along the first direction X.

[0084] The formula is mainly divided into three items. The length of the pole ear 112 of the first pole piece group 110 is subtracted from the length of the first section 113 of the first pole piece group 110 to obtain the length of the second section 114 of the first pole piece group 110, and then the length of the first section 113 of the nth pole piece group 110 is added to obtain the length of the pole ear 112 of the nth pole piece group 110.

[0085] The coefficient C plays a role in adjusting the overall size in the formula for calculating the length of the pole lug 112 of the pole piece group 110. The value range of C is between 0.85 and 1.15. When C = 0.85, the length of the pole lug 112 of the nth pole piece group 110 along the first direction X is the minimum value that can be achieved under given other parameters. When C = 1.15, the length of the pole lug 112 of the nth pole piece group 110 along the first direction X is the maximum value that can be achieved under given other parameters.

[0086] B=0, that is, the distance between the gathering point and the current collector 111 of the electrode on the side of the first electrode group 110 away from the other electrode groups is zero. A and B are position parameters. The position relationship between the gathering point and the electrode group 110 is mainly represented by A and B. The coefficient C can be used to adjust H n The overall size of the pole piece group 110 is mainly represented by n and T. H1 is a basic length, representing the length of the tab 112 without the influence of A and B.

[0087] Example 3: The convergence point has an orthographic projection on the current collector 111 of one of the electrode sets 110 along the second direction Y, and the orthographic projection is located in the middle of the current collectors 111 of multiple electrode sets 110 along the first direction X, wherein the second direction Y is perpendicular to the first direction X.

[0088] In this embodiment, if Figure 6 and Figure 7 As shown, when n is a positive integer, n≥2, In the case of meeting:

[0089] H n =C×{H m +[A 2 +B 2 ] 0.5 -[A 2 +T m 2 ] 0.5}

[0090] Wherein B is the distance between the convergence point and the current collector 111 of the electrode of the first electrode group 110 on the side away from the other electrode groups 110 in the first direction X, T m is the thickness of the pole piece group 110 closest to the convergence point, C is the coefficient, Hm is the length of the tab 112 of the electrode assembly 110 closest to the folding point, is the sum of the thicknesses of the n electrode sets 110 along the first direction X, A is the distance between the convergence point and the current collector 111 of the first electrode set 110 in the second direction Y, and H n is the length of the electrode tab 112 of the n-th electrode group 110 .

[0091] The formula is mainly divided into three items: the length of the pole ear 112 of the pole piece group 110 closest to the gathering point minus the length of the first section 113 of the pole piece group 110 closest to the gathering point, the length of the second section 114 of the pole piece group 110 closest to the gathering point, and then adding the length of the first section 113 of the nth pole piece group 110 to obtain the length of the pole ear 112 of the nth pole piece group 110.

[0092] The coefficient C plays a role in adjusting the overall size in the formula for calculating the length of the pole lug 112 of the pole piece group 110. The value range of C is between 0.85 and 1.15. When C = 0.85, the length of the pole lug 112 of the nth pole piece group 110 along the first direction X is the minimum value that can be achieved under given other parameters. When C = 1.15, the length of the pole lug 112 of the nth pole piece group 110 along the first direction X is the maximum value that can be achieved under given other parameters.

[0093] n≥2, That is, the distance between the gathering point and the current collector 111 of the electrode on the side of the first electrode group 110 away from the other electrode groups is the sum of the thicknesses from the first electrode group 110 to the electrode group 110 closest to the gathering point. A and B are position parameters. The positional relationship between the gathering point and the electrode group 110 is mainly represented by A and B. The coefficient C can be used to adjust the overall size. The relative positions between different electrode groups 110 are mainly represented by n and T. H1 is a basic length, representing the length of the tab 112 without the influence of A and B.

[0094] The present application also provides a battery cell 1, such as Figure 1 As shown, the battery cell 1 includes: a shell 20 , an end cover 30 and a battery cell assembly 10 .

[0095] The shell 20 serves as the main structure of the battery cell 1 and is responsible for forming a cavity 210 for accommodating and protecting other components inside the battery cell 1. The cavity 210 has good sealing and a certain strength so that the battery cell 1 can work stably in various usage environments while reducing the leakage of internal substances and the intrusion of external impurities.

[0096] The end cover 30 can be installed at the opening of the shell 20 to serve as a closed cavity 210. It also has an electrode terminal 310, which is the key point for connecting the battery cell 1 with the external circuit. The battery cell 1 can output electrical energy to the outside or receive charging energy through the electrode terminal 310.

[0097] The battery cell assembly 10 is the core part of the battery cell 1, responsible for performing electrochemical reactions during the charging and discharging process, thereby generating or storing electrical energy. The battery cell assembly 10 is usually composed of a positive electrode sheet, a negative electrode sheet, and a separator between the positive and negative electrode sheets. It is installed in the cavity 210 of the shell 20. The multiple second sections 114 of the battery cell assembly 10, that is, the lead-out parts of the positive electrode sheet and the negative electrode sheet, are electrically connected to the electrode terminal 310 on the end cover 30 to achieve electrical connection with the external circuit.

[0098] It can be understood that the battery cell 1 can form a complete and efficient battery system through the organic combination of the shell 20, the end cover 30 and the battery cell assembly 10, which can meet the energy storage and release requirements in various application scenarios. At the same time, the battery cell 1 also has high safety and reliability, which can ensure the user's safety and the stable operation of the battery.

[0099] An embodiment of the present application also provides a battery.

[0100] The battery may include a plurality of battery cells 1 , and the plurality of battery cells 1 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of battery cells 1 are connected in both series and in parallel.

[0101] Multiple battery cells 1 can be directly connected in series, parallel or mixed together to form a whole. Multiple battery cells 1 can also be connected in series, parallel or mixed together to form a battery module, and then multiple battery modules can be connected in series, parallel or mixed together to form a whole.

[0102] It is understandable that arranging multiple battery cells 1 side by side can improve the space utilization of the battery and help achieve uniform distribution and rapid heat dissipation.

[0103] An embodiment of the present application also provides an electrical device.

[0104] The electrical device includes a battery, which is used to provide electrical energy to the electrical device.

[0105] Electrical devices use integrated batteries as energy sources. Electrical devices are a broad concept and can include but are not limited to mobile phones, tablets, laptops, electric vehicles and ships, ranging from simple portable electronic devices to complex household appliances and industrial equipment.

[0106] Batteries are one of the core components of electrical devices. They are responsible for converting chemical energy into electrical energy, providing a continuous and stable power supply for the devices. Compared with fixed power sources, batteries are more portable, allowing electrical devices to work independently without an external power supply.

[0107] It is understandable that the electrical device uses an integrated battery as an energy source to drive its internal working mechanism or perform specific functions.

[0108] An embodiment of the present application also provides an energy storage device.

[0109] The energy storage device includes a battery, which is used to provide electrical energy to the energy storage device.

[0110] Energy storage equipment is a device that can store electrical energy and release it when needed. It is usually used to balance grid loads, provide backup power, optimize energy utilization, and support the integration of renewable energy. Battery systems composed of multiple battery cells1 are one of the most common energy storage devices. For example, energy storage equipment in power systems can store excess electrical energy and release it when power demand peaks, thereby helping to stabilize grid operation, reduce dependence on traditional power plants, and improve the overall efficiency and reliability of the energy system.

[0111] Understandably, energy storage devices have a wide range of applications, from home energy storage systems to large-scale grid-scale energy storage power stations.

[0112] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0113] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0114] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0115] In the description of this application, “plurality” means two or more.

[0116] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0117] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0118] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0119] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell assembly, characterized in that: Comprising: A plurality of pole piece groups are stacked along a first direction. Each pole piece group includes a plurality of pole pieces stacked along the first direction. Each pole piece includes a current collector and a tab. The tab includes a first segment and a second segment. The first end of the first segment is connected to the second segment, and the second end of the first segment is connected to the current collector. The first ends of the first segments of the plurality of pole piece groups are收拢 at a收拢 point so that the second segments of the plurality of pole piece groups are stacked. The length of the tab is positively correlated with the distance from the pole piece group where the tab is located to the收拢 point along the first direction. The lengths of the tabs of the pole pieces in each pole piece group are the same.

2. The battery core assembly according to claim 1, characterized in that The first pole piece group is the outermost pole piece group of the plurality of pole piece groups along the first direction. The first pole piece group has two side surfaces opposite to each other along the first direction. The收拢 point has a positive projection on the current collector of the first pole piece group along a second direction. The positive projection is spaced apart from the two side surfaces along the first direction. The second direction is perpendicular to the first direction.

3. The battery cell assembly according to claim 2, characterized in that: When n is a positive integer and B < 0.5T1, the following is satisfied: Wherein B is the distance between the convergence point and the current collector of the electrode on the side of the first electrode group away from the other electrode groups in the first direction, T1 is the thickness of the first electrode group, C is the coefficient, H1 is the length of the electrode ear of the first electrode group, is the sum of the thicknesses of the n electrode sets along the first direction, A is the distance between the convergence point and the current collector of the first electrode set in the second direction, H n is the length of the pole lug of the nth pole piece group.

4. The battery core assembly according to claim 2, characterized in that When n is a positive integer and 0.5T1 ≤ B < T1, the following is satisfied: Wherein B is the distance between the convergence point and the pole piece on the side of the first pole piece group away from the other pole piece groups in the first direction, T1 is the thickness of the first pole piece group, C is the coefficient, H1 is the length of the pole ear of the first pole piece group, is the sum of the thicknesses of the n electrode groups along the first direction, A is the distance between the convergence point and the first electrode group in the second direction, H n is the length of the pole lug of the nth pole piece group.

5. The battery core assembly according to claim 1, characterized in that: The first pole piece group is the outermost pole piece group of the plurality of pole piece groups along the first direction. The first pole piece group has two side surfaces opposite to each other along the first direction. The收拢 point has a positive projection on the current collector of the first pole piece group along a second direction. The positive projection coincides with the side surface of the first pole piece group facing away from the other pole piece groups along the first direction. The second direction is perpendicular to the first direction.

6. The battery core assembly according to claim 5, characterized in that: When n is a positive integer and B = 0, the following is satisfied: Wherein B is the distance between the convergence point and the pole piece on the side of the first pole piece group away from the other pole piece groups in the first direction, T1 is the thickness of the first pole piece group, C is the coefficient, H1 is the length of the pole ear of the first pole piece group, is the sum of the thicknesses of the n electrode groups along the first direction, A is the distance between the convergence point and the first electrode group in the second direction, H n is the length of the pole lug of the nth pole piece group.

7. The battery cell assembly according to claim 1, characterized in that The收拢 point has a positive projection on the current collector of one of the pole piece groups along a second direction. The positive projection is located in the middle of the current collectors of the plurality of pole piece groups along the first direction. The second direction is perpendicular to the first direction.

8. The battery core assembly according to claim 7, characterized in that: When n≥2, In the case of meeting: H n =C×{H m +[A 2 +B 2 ] 0.5 -[A 2 +T m 2 ] 0.5 } Wherein B is the distance between the folding point and the pole piece on the side of the first pole piece group away from the other pole piece groups in the first direction, T m is the thickness of the electrode group closest to the convergence point, C is the coefficient, H m is the length of the tab of the electrode group closest to the retraction point, is the sum of the thicknesses of the n electrode groups along the first direction, A is the distance between the convergence point and the first electrode group in the second direction, H n is the length of the pole lug of the nth pole piece group.

9. The battery cell assembly according to any one of claims 3, 4, 6 and 8, characterized in that: The coefficient C satisfies: 0.85 ≤ C ≤ 1.

15.

10. A battery cell, characterized in that: Comprising: A housing forming a cavity; An end cap mounted on the housing and having electrode terminals; The battery cell assembly according to any one of claims 1-9, the battery cell assembly is mounted in the cavity, and the plurality of second segments of the battery cell assembly are electrically connected to the electrode terminals on the cover body.

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