Cell structure and battery

Abstract

This application relates to the technical field of battery production and manufacturing, and in particular to a battery cell structure and a battery; the battery cell structure includes a positive electrode sheet, a negative electrode sheet, and a separator; the positive electrode sheet and the negative electrode sheet are arranged alternately along a first direction, and the adjacent positive electrode sheet and negative electrode sheet are separated by the separator; one of the adjacent positive electrode sheet and negative electrode sheet is an inline structure with multiple active regions, and the other has multiple corresponding active regions, that is, each negative electrode sheet has multiple corresponding positive electrode sheets; compared with the prior art, for the entire battery cell structure, the overall number of layers is reduced. Then, when the tabs on multiple positive electrode sheets are welded into a positive electrode tab bundle and the tabs on multiple negative electrode sheets are welded into a negative electrode tab bundle, the number of welding layers of the negative electrode tab bundle is greatly reduced. Therefore, the welding reliability is greatly improved, the welding operation difficulty is reduced. In addition, the equipment investment can also be reduced, and the form of electrical connection output is more diverse.

Description

Technical Field

[0001] The present application relates to the technical field of battery production and manufacturing, and in particular to a cell structure and a battery. Background Art

[0002] Currently, the electrode core of a stacked structure battery on the market is usually formed by sequentially stacking a separator, a negative electrode sheet, a separator, a positive electrode sheet, a separator, a negative electrode sheet, and a separator. A tab is reserved on each electrode sheet, and all the positive tab bundles of the stacked electrode core are connected (welded) into a terminal for output, and all the negative tab bundles are connected (welded) into a terminal for output; however, when manufacturing a large-capacity cell, due to the large number of stacked electrode sheets, the difficulty of welding the tabs into terminals increases.

[0003] Therefore, there is an urgent need for a cell structure and a battery to solve the technical problems existing in the prior art to a certain extent. Summary of the Invention

[0004] The purpose of the present application is to provide a cell structure and a battery to solve, to a certain extent, the technical problem that the welding difficulty of tabs is large when welding tabs into terminals due to the large number of stacked electrode sheets in the prior art.

[0005] The present application provides a cell structure, including a positive electrode sheet, a negative electrode sheet, and a separator; the positive electrode sheet and the negative electrode sheet are arranged alternately along a first direction, and the adjacent positive electrode sheet and negative electrode sheet are separated by the separator; one of the adjacent positive electrode sheet and negative electrode sheet is an inline structure with multiple active regions, and the other is provided with multiple corresponding to the active regions.

[0006] In the above technical solution, further, when the negative electrode sheet is the inline structure, the negative electrode sheet includes a current collector layer and an active material layer;

[0007] Both sides of the current collector layer are provided with multiple active material layers arranged in a tiled manner on the current collector layer so that the negative electrode sheet has multiple active regions.

[0008] In the above technical solution, further, the multiple active material layers on the same side are arranged at intervals so that there is a gap between adjacent active material layers.

[0009] In the above technical solution, further, the negative electrode sheet further includes a first electrolyte release layer, and the first electrolyte release layer is disposed in the gap; the electrolyte released by the first electrolyte release layer can balance the electrolyte of the cell.

[0010] In the above technical solution, further, when the negative electrode sheet is the inline structure, the negative electrode sheet includes a current collector layer and an active material layer;

[0011] The active material layer is disposed on both sides of the current collector layer;

[0012] A groove is formed in the active material layer, and the groove extends along the width direction of the active material layer, so that the negative electrode sheet has a plurality of the active regions.

[0013] In the above technical solution, further, the negative electrode sheet further includes a second electrolyte release layer, and the second electrolyte release layer is disposed in the groove; the electrolyte released by the second electrolyte release layer can balance the electrolyte of the battery cell.

[0014] In the above technical solution, further, the size of the positive electrode sheet is less than or equal to the size of the active region.

[0015] In the above technical solution, further, the properties of the plurality of positive electrode sheets are all the same, all different, or some are the same and some are different.

[0016] In the above technical solution, further, the separator extends in a serpentine shape.

[0017] The present application further provides a battery, including a housing, a positive electrode terminal, a negative electrode terminal disposed on the housing, and the above-described battery cell structure;

[0018] The positive electrode sheet is provided with a positive electrode tab, and a plurality of the positive electrode sheets arranged along the first direction form a positive electrode tab bundle, and a plurality of the positive electrode tab bundles are formed along the length direction of the negative electrode sheet;

[0019] A plurality of the positive electrode terminals are provided, and the plurality of positive electrode terminals are arranged at intervals along the length direction of the housing, and the plurality of positive electrode tab bundles are respectively connected to the plurality of positive electrode terminals, or, one positive electrode terminal is provided, and the plurality of positive electrode tab bundles are connected by a connecting piece to form a positive electrode tab bundle body, and the positive electrode tab bundle body is connected to the positive electrode terminal;

[0020] The negative electrode sheet is provided with a negative electrode tab, and a plurality of the negative electrode sheets arranged along the first direction form a negative electrode tab bundle, and the negative electrode tab bundle is connected to the negative electrode terminal;

[0021] The negative electrode tab bundle and the positive electrode tab bundle are located on the same side or on different sides.

[0022] Compared with the prior art, the beneficial effects of the present application are as follows:

[0023] The present application provides a battery cell structure, including positive electrode sheets, negative electrode sheets and a separator; the positive electrode sheets and the negative electrode sheets are arranged alternately along a first direction, and adjacent positive electrode sheets and the negative electrode sheets are separated by the separator; one of the adjacent positive electrode sheets and the negative electrode sheets is an inline structure with multiple active areas, and the other is provided with multiple corresponding active areas, that is, each negative electrode sheet has multiple positive electrode sheets corresponding to it; compared with the prior art, for the entire battery cell structure, the overall number of layers is reduced, so when the tabs on the multi-layer positive electrode sheets are welded into a positive electrode tab bundle, and the tabs on the multi-layer negative electrode sheets are welded into a negative electrode tab bundle, the number of welding layers of the negative electrode tab bundle is greatly reduced, thereby greatly improving the reliability of welding and reducing the difficulty of welding operation. In addition, it can also reduce equipment investment, and the electrical connection output form is also more diverse.

[0024] The present application also provides a battery, comprising a shell, a positive electrode column, a negative electrode column arranged in the shell, and the above-mentioned battery cell structure;

[0025] The positive electrode sheet is provided with a positive electrode tab, a plurality of the positive electrode sheets arranged along the first direction form a positive electrode tab bundle, and a plurality of the positive electrode tab bundles are formed along the length direction of the negative electrode sheet;

[0026] There are multiple positive electrode posts, and the multiple positive electrode posts are spaced apart along the length direction of the shell, and the multiple positive electrode tab bundles are connected to the multiple positive electrode posts in a one-to-one correspondence, or there is one positive electrode post, and the multiple positive electrode tab bundles are connected by connecting pieces to form a positive electrode tab bundle body, and the positive electrode tab bundle body is connected to the positive electrode post;

[0027] The negative electrode sheet is provided with a negative electrode tab, and a plurality of the negative electrode sheets arranged along the first direction form a negative electrode tab bundle, and the negative electrode tab bundle is connected to the negative electrode column;

[0028] The negative electrode tab bundle and the positive electrode tab bundle are located on the same side or on different sides.

[0029] Specifically, the setting of the positive electrode tab bundle and the negative electrode tab bundle reduces the number of tab layers, reduces welding difficulty, ensures welding reliability and stability, and greatly improves the process capability level. On the other hand, it can effectively reduce equipment investment due to the reduction of equipment welding power. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 It is a schematic structural diagram of the positive electrode sheet of the battery cell structure provided in the first embodiment of the present application;

[0032] Figure 2 It is a schematic structural diagram of the negative electrode sheet of the battery cell structure provided in the first embodiment of the present application;

[0033] Figure 3 is Figure 2 A-A cross-sectional view of;

[0034] Figure 4 It is a schematic structural diagram of the battery cell structure provided in the first embodiment of the present application;

[0035] Figure 5 It is a schematic structural diagram of the negative electrode sheet of the battery cell structure provided in the third embodiment of the present application;

[0036] Figure 6 is Figure 5 B-B cross-sectional view of;

[0037] Figure 7 It is a schematic structural diagram of the battery provided in the fifth embodiment of the present application;

[0038] Figure 8 It is a schematic structural diagram of the battery provided in the sixth embodiment of the present application;

[0039] Figure 9 It is a schematic structural diagram of the battery provided in the seventh embodiment of the present application.

[0040] Reference numerals:

[0041] 1 - Positive electrode sheet; 2 - Negative electrode sheet; 3 - Positive electrode tab; 4 - Negative electrode tab; 5 - Current collector layer; 6 - Active material layer; 7 - Gap; 8 - Groove; 9 - Separator; 10 - Battery; 11 - Positive electrode tab bundle; 12 - Negative electrode tab bundle; 13 - Connecting piece; 14 - Active area. Detailed implementation manners

[0042] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments.

[0043] Generally, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0044] Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0045] In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying 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 construed as a limitation of this application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0046] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0047] Embodiment 1

[0048] In this embodiment, in combination with Figures 1-4 as shown, a battery cell structure is described.

[0049] Specifically, the battery cell structure includes a positive electrode sheet 1, a negative electrode sheet 2, and a separator 9; the positive electrode sheet 1 and the negative electrode sheet 2 are arranged alternately along a first direction, where the first direction refers to the vertical direction, and the adjacent positive electrode sheet 1 and negative electrode sheet 2 are separated by the separator 9; in combination with Figures 1-4 as shown, in this embodiment, the negative electrode sheet 2 among the adjacent positive electrode sheets 1 and negative electrode sheets 2 is an in-line structure with two active regions 14, and two positive electrode sheets 1 are provided corresponding to the two active regions 14 on the same layer; that is, each negative electrode sheet 2 has two corresponding positive electrode sheets 1; compared with the prior art, for the entire battery cell structure, the overall number of layers is reduced. Then, when the tabs on the multiple positive electrode sheets 1 are welded into a positive electrode tab bundle and the tabs on the multiple negative electrode sheets 2 are welded into a negative electrode tab bundle, the number of welding layers of the negative electrode tab bundle is greatly reduced. Therefore, the welding reliability is greatly improved, the welding operation difficulty is reduced, and in addition, the equipment investment can also be reduced, and the form of electrical connection output is also more diverse.

[0050] For further illustration: Assume that in the prior art, there are a total of 79 layers of electrode sheets (the electrode sheets refer to the positive electrode sheet 1 and the negative electrode sheet 2), among which there are 40 layers of negative electrode sheets and 39 layers of positive electrode sheets. Then, the positive electrode tab bundle needs to weld the tabs corresponding to 39 layers of positive electrode sheets 1 simultaneously, and the negative electrode tab bundle needs to weld the tabs corresponding to 40 layers of negative electrode sheets 2 simultaneously. In this embodiment, since each negative electrode sheet 2 has two corresponding positive electrode sheets 1, it means that under the same conditions, in the cell structure of this embodiment, there are a total of 39 layers of electrode sheets (19 layers of positive electrode sheets and 20 layers of negative electrode sheets). When welding the positive electrode tab bundle, weld the tabs corresponding to 19 layers of positive electrode sheets 1; when welding the negative electrode tab bundle, weld the tabs corresponding to 20 layers of negative electrode sheets 2. Therefore, the welding layer number of the negative electrode tab bundle is greatly reduced, and the welding reliability is improved.

[0051] Further, the positive electrode sheet 1 and the separator 9 are connected together by gluing or crimping. On the one hand, it ensures the reliable fixation of the positive electrode sheet 1 and the negative electrode sheet 2 in the electrode core, and on the other hand, it can ensure the relative stability of the positions between the positive electrode sheet 1 and the negative electrode sheet 2.

[0052] It should be noted that the setting of the active regions 14 on the negative electrode sheet 2 is not limited to two, and there can be more, such as three, four, etc. If there are three active regions 14 on the negative electrode sheet 2, then the three corresponding active regions 14 of the positive electrode sheet 1 adjacent to the negative electrode sheet 2 can be set to three. In this way, the welding layer number of the negative electrode tab bundle can be further reduced.

[0053] In this embodiment, the negative electrode sheet 2 includes a current collector layer 5 and an active material layer 6. The active material layer 6 is filled with an active material, and the active material is formed on the current collector layer 5 in a coating form. Specifically, two active material layers 6 are provided on both sides of the current collector layer 5, and the two active material layers 6 are arranged in a manner of lying flat on the current collector layer 5, so that the negative electrode sheet 2 has two active regions 14.

[0054] More specifically, the two active material layers 6 on the same side are arranged at intervals, so that there is a gap 7 formed between adjacent active material layers 6. This gap 7 can realize the connection, current conduction, and heat conduction between the positive electrode sheet 1 and the negative electrode sheet 2, and output through the tab, improving the heat dissipation performance of the cell.

[0055] It should be noted that according to the required rate temperature rise requirements in the actual application scenario, the two active material layers 6 can also be arranged side by side on the current collector layer 5, that is, there is no gap 7 between the two active material layers 6, so as to further improve the energy density of the cell structure.

[0056] In addition, in combination with Figure 3As shown, the positions of the gaps 7 formed above and below the current collector layer 5 correspond to each other; in actual use, it is not limited to the corresponding setting of the gaps 7. According to the requirements of the actual application scenario, the positions of the gaps 7 above and below the current collector layer 5 can also be non-corresponding.

[0057] In this embodiment, the negative electrode sheet 2 further includes a first electrolyte release layer, and the first electrolyte release layer is disposed in the gap 7; specifically, the first electrolyte release layer is filled with a liquid-absorbing porous sponge; preferably, the material of the liquid-absorbing porous sponge can be PP or PE, which can gradually release the electrolyte at the end of the battery 10 life to make up for the consumption during the process, so that the electrolyte amount distribution is maintained at a certain controllable level, thereby improving the efficiency and service life of the battery 10.

[0058] In this embodiment, the size of the positive electrode sheet 1 is less than or equal to the size of the active area 14. Specifically, Figure 1 and Figure 2 as described, both the active area 14 and the positive electrode sheet 1 are rectangular, so the size here refers to the length and width of the rectangle.

[0059] In this embodiment, the two positive electrode sheets 1 have the same properties. Here, having the same properties can mean that the two positive electrode sheets 1 have the same areal density, or the same energy, or the same rate, etc.

[0060] In this embodiment, the separator 9 extends in a serpentine shape.

[0061] Embodiment 2

[0062] Another battery cell structure is described in this embodiment.

[0063] Specifically, the battery cell structure includes a positive electrode sheet, a negative electrode sheet, and a separator; the positive electrode sheet and the negative electrode sheet are arranged alternately along the first direction, where the first direction refers to the vertical direction, and the adjacent positive electrode sheet and negative electrode sheet are separated by the separator; in this embodiment, the negative electrode sheet among the adjacent positive electrode sheet and negative electrode sheet is an in-line structure with two active areas, and there are two positive electrode sheets corresponding to the two active areas in the same layer; that is, each negative electrode sheet has two corresponding positive electrode sheets; compared with the prior art, for the entire battery cell structure, the overall number of layers is reduced. Then, when the tabs on the multiple positive electrode sheets are welded into a positive electrode tab bundle and the tabs on the multiple negative electrode sheets are welded into a negative electrode tab bundle, the number of welding layers of the negative electrode tab bundle is greatly reduced. Therefore, the welding reliability is greatly improved, the welding operation difficulty is reduced, and in addition, the equipment investment can also be reduced, and at the same time, the form of electrical connection output is more diverse.

[0064] For further illustration: Assume that in the prior art, there are a total of 79 layers of electrode sheets (the electrode sheets refer to the positive electrode sheet 1 and the negative electrode sheet 2), among which there are 40 layers of negative electrode sheets and 39 layers of positive electrode sheets. Then, the positive electrode tab bundle needs to weld the tabs corresponding to 39 layers of positive electrode sheets simultaneously, and the negative electrode tab bundle needs to weld the tabs corresponding to 40 layers of negative electrode sheets simultaneously. In this embodiment, since each negative electrode sheet 2 has two corresponding positive electrode sheets 1, it means that under the same conditions, in the electrode core structure of this embodiment, there are a total of 39 layers of electrode sheets (among which there are 19 layers of positive electrode sheets and 20 layers of negative electrode sheets). Then, when welding the positive electrode tab bundle, weld the tabs corresponding to 19 layers of positive electrode sheets 1; when welding the negative electrode tab bundle, weld the tabs corresponding to 20 layers of negative electrode sheets 2. Therefore, the number of welding layers of the negative electrode tab bundle is greatly reduced, and the welding reliability is improved.

[0065] Furthermore, the positive electrode sheet and the separator are connected together by gluing or crimping. On the one hand, it ensures the reliable fixation of the positive electrode sheet and the negative electrode sheet in the electrode core, and on the other hand, it can ensure the relative stability of the positions between the positive electrode sheet and the negative electrode sheet.

[0066] It should be noted that the setting of the active regions on the negative electrode sheet is not limited to two, and there can be more, such as three, four, etc. If there are three active regions on the negative electrode sheet, then the three active regions corresponding to the positive electrode sheet adjacent to the negative electrode sheet can be set to three; in this way, the number of welding layers of the negative electrode tab bundle can be further reduced.

[0067] In this embodiment, the negative electrode sheet includes a current collector layer and an active material layer; the active material layer is filled with active material, and the active material is formed on the current collector layer in a coating form; specifically, two active material layers are provided on both sides of the current collector layer, and the two active material layers are arranged in a way that they are laid flat on the current collector layer, so that the negative electrode sheet has two active regions.

[0068] More specifically, the two active material layers on the same side are arranged at intervals, so that there is a gap between adjacent active material layers. This gap can realize the connection, current conduction, and heat conduction between the positive electrode sheet and the negative electrode sheet, and output through the tab, improving the heat dissipation performance of the battery cell.

[0069] It should be noted that according to the required rate temperature rise in the actual application scenario, the two active material layers can also be arranged side by side on the current collector layer, that is, there is no gap between the two active material layers, so as to further improve the energy density of the battery cell structure.

[0070] In addition, the positions of the gaps formed above and below the current collector layer are corresponding; in the actual use process, it is not limited to the corresponding setting of the gaps. According to the requirements of the actual application scenario, the gap positions above and below the current collector layer can also be in a non-corresponding relationship.

[0071] In this embodiment, the negative electrode sheet further includes a first electrolyte release layer, which is disposed in the gap; specifically, the first electrolyte release layer is filled with a liquid-absorbing porous foam; preferably, the material of the liquid-absorbing porous foam can be PP or PE, and it can release the electrolyte gradually at the end of the life of the battery 10 to make up for the consumption during the process, so that the electrolyte amount distribution is maintained at a certain controllable level, thereby improving the efficiency and service life of the battery.

[0072] In this embodiment, the size of the positive electrode sheet is less than or equal to the size of the active area. Specifically, Figure 1 and Figure 2 as described above, both the active area and the positive electrode sheet are rectangular, so the size here refers to the length and width of the rectangle.

[0073] In this embodiment, the properties of the two positive electrode sheets are different. The difference in properties here can refer to the difference in the areal density of the two positive electrode sheets, or the difference in energy, or the difference in rate of the two positive electrode sheets, etc.

[0074] Specifically, the separator extends in a serpentine shape. More specifically, the separator extending in a serpentine shape can also be understood as a Z-type stacking method for multiple layers of positive electrode sheets and multiple layers of negative electrode sheets. According to the stacking thickness, the temperature rise during charge and discharge, and the utilization rates of the active materials of the positive electrode sheet and the negative electrode sheet, the placement order of the positive electrode sheets with different properties is changed, and the current density distribution and heat generation effect of the electrode sheets (positive electrode sheet and negative electrode sheet) are changed by changing the distance between the positive electrode tabs and the negative electrode tabs between layers, reducing the thermal difference and the difference in active material utilization between the positive electrode sheet and the negative electrode sheet, and improving the service life of the battery.

[0075] Furthermore, in the Z-type stacking method, by selecting different properties for the positive electrode sheets (such as energy-type A sheets and rate-type B sheets) and combining their respective advantages, the low-temperature rate performance of the battery can be guaranteed and the application range of the battery can be broadened.

[0076] It should be noted that: in the first embodiment, a case of two positive electrode sheets with the same properties is described, and in this embodiment, a case of two positive electrode sheets with different properties is described; in addition, if one negative electrode sheet corresponds to three positive electrode sheets, then the properties of two of the positive electrode sheets can be the same or different.

[0077] Embodiment Three

[0078] Combined with Figure 5 and Figure 6 as described above, another cell structure is described.

[0079] Specifically, the battery cell structure includes a positive electrode sheet 1, a negative electrode sheet 2, and a separator 9; the positive electrode sheet 1 and the negative electrode sheet 2 are arranged in an interleaved manner along a first direction, where the first direction refers to the vertical direction, and the adjacent positive electrode sheet 1 and negative electrode sheet 2 are separated by the separator 9; combined with Figure 5 and Figure 6 As shown, in this embodiment, the negative electrode sheet 2 among the adjacent positive electrode sheet 1 and negative electrode sheet 2 is an inline structure with two active regions 14, and two are provided corresponding to the two active regions 14 on the same layer of the positive electrode sheet 1; that is to say, each negative electrode sheet 2 has two corresponding positive electrode sheets 1; compared with the prior art, for the entire battery cell structure, the overall number of layers is reduced. Then, when the tabs on the multiple layers of positive electrode sheets 1 are welded into a positive electrode tab bundle, and the tabs on the multiple layers of negative electrode sheets 2 are welded into a negative electrode tab bundle, the number of welding layers of the negative electrode tab bundle is greatly reduced. Therefore, the welding reliability is greatly improved, the welding operation difficulty is reduced, and in addition, the equipment investment can be reduced, and the form of electrical connection output is also more diverse.

[0080] For further illustration: Assume that in the prior art, the total number of electrode sheets (the electrode sheets refer to the positive electrode sheet 1 and the negative electrode sheet 2) is 79 layers (where there are 40 layers of negative electrode sheets and 39 layers of positive electrode sheets). Then, the positive electrode tab bundle needs to weld the tabs corresponding to 39 layers of positive electrode sheets 1 at the same time, and the negative electrode tab bundle needs to weld the tabs corresponding to 40 layers of negative electrode sheets 2 at the same time; in this embodiment, since each negative electrode sheet 2 has two corresponding positive electrode sheets 1, that is to say, under the same conditions, in the battery cell structure of this embodiment, the total number of electrode sheets is 39 layers (where there are 19 layers of positive electrode sheets and 20 layers of negative electrode sheets). Then, when welding the positive electrode tab bundle, weld the tabs corresponding to 19 layers of positive electrode sheets 1; when welding the negative electrode tab bundle, weld the tabs corresponding to 20 layers of negative electrode sheets 2. Therefore, the number of welding layers of the negative electrode tab bundle is greatly reduced, and the welding reliability is improved.

[0081] Furthermore, the positive electrode sheet 1 and the separator 9 are connected together by gluing or crimping. On the one hand, it ensures the reliable fixation of the positive electrode sheet 1 and the negative electrode sheet 2 in the electrode core, and on the other hand, it can ensure the relative stability of the positions between the positive electrode sheet 1 and the negative electrode sheet 2.

[0082] It should be noted that the setting of the active regions 14 on the negative electrode sheet 2 is not limited to two, and there can be more, such as three, four, etc.; if there are three active regions 14 on the negative electrode sheet 2, then the positive electrode sheet 1 adjacent to the negative electrode sheet 2 can be set to three corresponding to the three active regions 14; in this way, the number of welding layers of the negative electrode tab bundle can be further reduced.

[0083] In this embodiment, the negative electrode sheet 2 includes a current collector layer 5 and an active material layer 6; the active material layer 6 is filled with an active material, and the active material is formed on the current collector layer 5 in a coating form; specifically, a groove 8 is formed in the active material layer 6, and the groove 8 extends along the width direction of the active material layer 6, so that the negative electrode sheet 2 has two active regions 14. This groove 8 can achieve the connection and current conduction and heat conduction between the positive electrode sheet 1 and the negative electrode sheet 2, and output through the tab, thereby improving the heat dissipation performance of the battery cell.

[0084] It should be noted that the positions of the grooves 8 formed above and below the current collector layer 5 are corresponding; in the actual use process, it is not limited to the corresponding setting of the grooves 8. According to the requirements of the actual application scenario, the positions of the grooves 8 above and below the current collector layer 5 can also be non-corresponding.

[0085] In this embodiment, the negative electrode sheet 2 further includes a second electrolyte release layer, and the second electrolyte release layer is disposed in the groove 8; specifically, the second electrolyte release layer is filled with a liquid-absorbing porous foam; preferably, the material of the liquid-absorbing porous foam can be PP or PE, and the electrolyte that can be gradually released at the end of the battery life is used to make up for the consumption during the process, so that the electrolyte amount distribution is maintained at a certain controllable level, thereby improving the efficiency and service life of the battery.

[0086] In this embodiment, the size of the positive electrode sheet 1 is less than or equal to the size of the active region 14. Specifically, both the active region 14 and the positive electrode sheet 1 are rectangular, and the size here refers to the length and width of the rectangle.

[0087] In this embodiment, the properties of the positive electrode sheet 1 are as follows: (1) The properties of the two positive electrode sheets 1 are the same (the same properties here can refer to the same surface density of the two positive electrode sheets 1, or the same energy of the two positive electrode sheets 1, or the same rate of the two positive electrode sheets 1, etc.); (2) The properties of the two positive electrode sheets 1 are different (the different properties here can refer to the different surface densities of the two positive electrode sheets 1, or the different energies of the two positive electrode sheets 1, or the different rates of the two positive electrode sheets 1, etc.); (3) If one negative electrode sheet 2 corresponds to three positive electrode sheets 1, then the properties of two of the positive electrode sheets 1 can be the same or different.

[0088] In this embodiment, the separator 9 extends in a serpentine shape.

[0089] Specifically, the diaphragm 9 extending in a serpentine shape can also be understood as a Z-shaped stacking method for the multi-layer positive electrode sheets 1 and the multi-layer negative electrode sheets 2. According to the stacking thickness, the temperature rise during charge and discharge, and the utilization rates of the active materials of the positive electrode sheet 1 and the negative electrode sheet 2, the placement order of the positive electrode sheets 1 with different properties is changed. By changing the distance between the positive electrode tabs and the negative electrode tabs between the layers, the current density distribution and heat generation effect of the electrode sheets (positive electrode sheet 1 and negative electrode sheet 2) are changed, the thermal difference and the difference in the utilization of the active materials between the positive electrode sheet 1 and the negative electrode sheet 2 are reduced, and the service life of the battery is improved.

[0090] Furthermore, in the Z-shaped stacking method, by selecting different properties for the positive electrode sheet 1 (such as energy type A sheet and rate type B sheet) and combining their respective advantages, the low-temperature rate performance of the battery can be ensured, and the application range of the battery can be broadened.

[0091] Embodiment 4

[0092] In the above embodiment, an example is given where each negative electrode sheet has two corresponding positive electrode sheets, but it is not limited to the structure in which an active area is formed on the negative electrode sheet. In this embodiment, multiple active areas can also be formed on the positive electrode sheet. Then, the cell structure is: each positive electrode sheet has multiple corresponding negative electrode sheets; this structure can also reduce the number of welding layers for the negative electrode tab bundle.

[0093] Embodiment 5

[0094] Combined with Figure 7 as shown, a battery is described.

[0095] Specifically, a battery includes a housing, a positive electrode post, a negative electrode post disposed on the housing, and the cell structure described in the above embodiment;

[0096] More specifically, the positive electrode sheet 1 is provided with a positive electrode tab 3, and a plurality of positive electrode sheets 1 arranged in the vertical direction form a positive electrode tab bundle 11. Based on the description in the above embodiment, two positive electrode tab bundles 11 can be formed at intervals along the length direction of the negative electrode sheet 2; two positive electrode posts are provided on the housing, and the two positive electrode tab bundles 11 are respectively connected to the two positive electrode posts;

[0097] More specifically, the negative electrode sheet 2 is provided with a negative electrode tab 4, and a plurality of negative electrode sheets 2 in the vertical direction can form a negative electrode tab bundle 12, and the negative electrode tab bundle 12 is connected to the negative electrode post;

[0098] It should be noted that in this embodiment, the negative electrode tab bundle 12 and the positive electrode tab bundle 11 are on the same side. Further, the negative electrode tab bundle 12 is in the middle of the two positive electrode tab bundles 11.

[0099] It should be noted that in this embodiment, since two positive electrode posts are provided, during actual use, the two positive electrode posts need to be electrically connected to form a positive electrode, thereby realizing self-balancing of the battery and improving the service life of the battery. Further, by regularly calibrating the remaining capacity of the independently used battery, a reference basis is provided for attenuation analysis.

[0100] In summary, the single stacked electrode core structure forms three ear groups (two positive electrode ear bundles 11 and one negative electrode ear bundle 12) after lamination. Since the lamination process is adopted, the alignment accuracy of the single negative electrode ear bundle 12 or the single positive electrode ear bundle 11 is high, which can increase the effective welding area of the welding zone and ensure the effective current-carrying capacity of the single negative electrode ear bundle 12 or the single positive electrode ear bundle 11.

[0101] Furthermore, the arrangement of the positive electrode ear bundle 11 and the negative electrode ear bundle 12 can, on the one hand, reduce the number of ear layers of the ear bundle, lower the welding difficulty, ensure the welding reliability and stability, and greatly improve the process ability level. On the other hand, since the welding power of the equipment is reduced, the equipment investment can be effectively reduced. At the same time, due to the arrangement of multiple positive electrode ear bundles 3, the number of welding layers is reduced, the process ability level is improved, the welding is stable, the situation of false welding in multi-layer welding can be avoided, the overall current-carrying capacity is increased, the current difference between the layers of the electrode sheets caused by welding is reduced, the consistency is better, the overall connection impedance is reduced, and a lower over-current temperature rise during normal charge and discharge processes is ensured.

[0102] Embodiment Six

[0103] Combined with Figure 8 as described above, a battery is described.

[0104] Specifically, a battery includes a housing, a positive electrode post, a negative electrode post disposed on the housing, and the electrode core structure described in the above embodiments;

[0105] More specifically, the positive electrode sheet 1 is provided with positive electrode ears 3, and a plurality of positive electrode sheets 1 arranged in the vertical direction form a positive electrode ear bundle 11. Based on the description in the above embodiments, two positive electrode ear bundles 11 can be formed at intervals along the length direction of the negative electrode sheet 2; two positive electrode posts are provided on the housing, and the two positive electrode ear bundles 11 are respectively connected to the two positive electrode posts;

[0106] More specifically, the negative electrode sheet 2 is provided with negative electrode ears 4, and a plurality of negative electrode sheets 2 in the vertical direction can form a negative electrode ear bundle 12, and the negative electrode ear bundle 12 is connected to the negative electrode post;

[0107] It should be noted that in this embodiment, the negative electrode ear bundle 12 and the positive electrode ear bundle 11 are on opposite sides.

[0108] It should be noted that in this embodiment, since two positive electrode posts are provided, during actual use, the two positive electrode posts need to be electrically connected to form a positive electrode, thereby realizing self - balancing of the battery and improving the service life of the battery. Further, by regularly calibrating the remaining capacity of independent use, a reference basis is provided for attenuation analysis.

[0109] In summary, the single - core structure after lamination forms three ear groups (two positive - ear bundles 11 and one negative - ear bundle 12). Since the lamination process is adopted, the alignment accuracy of the single negative - ear bundle 12 or the single positive - ear bundle 11 is high, which can increase the effective welding area of the welding zone and ensure the effective current - carrying capacity of the single negative - ear bundle 12 or the single positive - ear bundle 11.

[0110] Furthermore, the setting of the positive - ear bundle 11 and the negative - ear bundle 12 reduces the number of ear layers in the ear bundle on the one hand, reduces the welding difficulty, ensures the welding reliability and stability, and greatly improves the process ability level. On the other hand, since the welding power of the equipment is reduced, the equipment investment can be effectively reduced. At the same time, due to the setting of multiple positive - ear bundles 3, the welding layers are reduced, the process ability level is improved, the welding is stable, the situation of virtual welding in multi - layer welding is avoided, the overall current - carrying capacity is increased, and the current difference between the layers of the pole pieces caused by welding is reduced, the consistency is better, the overall connection impedance is reduced, and a lower over - current temperature rise during normal charge and discharge processes is ensured.

[0111] Embodiment Seven

[0112] Combined with Figure 9 as described above, a battery is described.

[0113] Specifically, a battery includes a housing, a positive electrode post, a negative electrode post arranged on the housing, and the core structure described in the above - mentioned embodiment;

[0114] More specifically, the positive electrode plate 1 is provided with positive ears 3, and multiple positive electrode plates 1 arranged along the vertical direction form a positive - ear bundle 11. Based on the description in the above - mentioned embodiment, two positive - ear bundles 11 can be formed at intervals along the length direction of the negative electrode plate 2; further, the two positive - ear bundles 11 are connected by a connecting piece 13 to form a positive - ear bundle 11 body; one positive electrode post is arranged on the housing; and one positive - ear bundle 11 body is exactly connected to one positive electrode post.

[0115] More specifically, the negative electrode plate 2 is provided with negative ears 4, and multiple negative electrode plates 2 along the vertical direction can form a negative - ear bundle 12, and the negative - ear bundle 12 is connected to the negative electrode post;

[0116] It should be noted that in this embodiment, the negative - ear bundle 12 and the positive - ear bundle 11 are on opposite sides.

[0117] In summary, the single pole core structure after lamination forms three pole ear groups (two positive pole ear bundles 11 and one negative pole ear bundle 12). Since the lamination process is adopted, the alignment accuracy of the single negative pole ear bundle 12 or the single positive pole ear bundle 11 is high, which can increase the effective welding area of the welding zone and ensure the effective current-carrying capacity of the single negative pole ear bundle 12 or the single positive pole ear bundle 11.

[0118] Furthermore, the arrangement of the positive pole ear bundle 11 and the negative pole ear bundle 12 reduces the number of pole ear layers in the pole ear bundle on the one hand, reduces the welding difficulty, ensures the welding reliability and stability, and greatly improves the process ability level. On the other hand, since the welding power of the equipment is reduced, the equipment investment can be effectively reduced. At the same time, due to the arrangement of multiple positive ear 3 bundles, the number of welding layers is reduced, the process ability level is improved, the welding is stable, the situation of virtual welding in multi-layer welding is avoided, the overall current-carrying capacity is improved, the current difference between the pole pieces of each layer caused by welding is reduced, the consistency is better, the overall connection impedance is reduced, and the overcurrent temperature rise during normal charging and discharging is ensured to be low.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell structure includes a positive electrode sheet, a negative electrode sheet, and a separator; the positive electrode sheet and the negative electrode sheet are arranged in an interleaved manner along a first direction, and the adjacent positive electrode sheet and negative electrode sheet are separated by the separator; characterized in that, One of the adjacent positive electrode sheet and the negative electrode sheet is an inline structure having a plurality of active regions, and the other is provided with a plurality of corresponding to the active regions; When the negative electrode sheet is the inline structure, the negative electrode sheet includes a current collector layer and an active material layer; a plurality of the active material layers are arranged on both sides of the current collector layer in a manner of being tiled on the current collector layer so that the negative electrode sheet has a plurality of the active regions; The plurality of the active material layers on the same side are arranged at intervals so that a gap is formed between adjacent active material layers; The negative electrode sheet further includes a first electrolyte release layer, and the first electrolyte release layer is disposed in the gap; the first electrolyte release layer is filled with an absorbent porous foam surface, and the electrolyte released by the first electrolyte release layer can balance the electrolyte of the battery cell; When the negative electrode sheet is the inline structure, the negative electrode sheet includes a current collector layer and an active material layer; the active material layer is disposed on both sides of the current collector layer; a groove is formed in the active material layer, and the groove extends along the width direction of the active material layer so that the negative electrode sheet has a plurality of the active regions; The negative electrode sheet further includes a second electrolyte release layer, and the second electrolyte release layer is disposed in the groove; the electrolyte released by the second electrolyte release layer can balance the electrolyte of the battery cell.

2. The cell structure according to claim 1, characterized in that The size of the positive electrode sheet is less than or equal to the size of the active region.

3. The cell structure according to claim 1, characterized in that, The properties of the plurality of positive electrode sheets are all the same or all different or some of them are the same and some of them are different; The property refers to the areal density or energy or rate.

4. The cell structure according to claim 1, characterized in that, The separator extends in a serpentine shape.

5. A battery, characterized in that, It includes a housing, a positive electrode terminal, a negative electrode terminal disposed on the housing, and the battery cell structure according to any one of claims 1-4; The positive electrode sheet is provided with a positive electrode tab, and a plurality of the positive electrode sheets arranged along the first direction form a positive electrode tab bundle, and a plurality of negative electrode tab bundles are formed along the length direction of the negative electrode sheet; A plurality of the positive electrode terminals are provided, and the plurality of positive electrode terminals are arranged at intervals along the length direction of the housing, and the plurality of positive electrode tab bundles are connected to the plurality of positive electrode terminals one by one, or one positive electrode terminal is provided, and the plurality of positive electrode tab bundles are connected by a connecting piece to form a positive electrode tab bundle body, and the positive electrode tab bundle body is connected to the positive electrode terminal; The negative electrode sheet is provided with a negative electrode tab, and a plurality of the negative electrode sheets arranged along the first direction form a negative electrode tab bundle, and the negative electrode tab bundle is connected to the negative electrode terminal; The negative electrode tab bundle and the positive electrode tab bundle are located on the same side or different sides.

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