Battery cell structure

Abstract

The utility model belongs to the technical field of secondary battery monomers, and particularly provides a battery cell structure which comprises a first battery cell monomer and a second battery cell monomer which are electrically connected by a plurality of naked battery cells, and the plurality of naked battery cells in the first battery cell monomer are stacked along a first direction of the battery cell structure. The plurality of naked battery cells in the second battery cell monomer are stacked along a second direction of the battery cell structure, and the first direction is not parallel to the second direction; through the improvement on the battery cell structure, after the battery cell monomers are impacted, the battery cells in the battery cell monomers disperse the action of external force in all directions, so that the battery cells cannot be mutually extruded, the heat generated by extrusion is reduced, and the safety performance is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of secondary batteries, and specifically relates to a battery core structure. Background Art

[0002] With the rapid development of the battery monomer industry, the voltage requirements of battery monomers are getting higher and higher (the battery voltage is required to be more than 5V, usually used in new energy vehicles and large energy storage batteries). As a result, battery monomers with multiple cells in series have been developed, that is, multiple single cells are connected in series to achieve the purpose of increasing the battery monomer voltage and mass energy density.

[0003] Considering the way that multiple battery cells are connected in series inside the battery and its overall safety performance (mainly the increase in heat generation inside the battery after being impacted, causing the battery to burn or explode), the solution of connecting multiple battery cells in series is limited.

[0004] Based on this, it is urgent to invent a battery cell structure to solve the above-mentioned technical problems. Utility Model Content

[0005] The utility model aims to provide a battery core structure to address the deficiencies of the prior art. The battery core structure can prevent the battery cell from burning or exploding due to increased internal heat generation after being impacted.

[0006] The technical solution of the utility model to solve the above technical problems is to provide a battery cell structure, including a first battery cell unit and a second battery cell unit electrically connected by multiple bare battery cells, the multiple bare battery cells inside the first battery cell unit are stacked along a first direction of the battery cell structure, and the multiple bare battery cells inside the second battery cell unit are stacked along a second direction of the battery cell structure, and the first direction and the second direction are not parallel.

[0007] The beneficial effects of the utility model are:

[0008] Through the above improvements to the cell structure, when a cell body is impacted, the cells inside the cell body disperse the external force in all directions and thus will not be squeezed against each other, thereby reducing the heat generated by squeezing and improving safety performance.

[0009] As an improvement to the battery cell structure of the utility model, the first battery cell monomer occupies 1 / 10-9 / 10 of the volume of the battery cell structure, and the second battery cell monomer occupies 1 / 10-9 / 10 of the volume of the battery cell structure.

[0010] As an improvement to the battery cell structure of the utility model, the interior of the first battery cell and / or the second battery cell is filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds, and in the axial direction of the battery cell structure, the capacity of the first battery cell is equivalent to the capacity of the second battery cell.

[0011] As an improvement to the cell structure of the utility model, the second cell monomer is provided with at least two bare cell placement areas, an isolation plate is provided between two adjacent bare cell placement areas, and the directions of the bare cells stacked in the two adjacent bare cell placement areas are not parallel.

[0012] As an improvement to the battery cell structure of the utility model, the second battery cell monomer is sequentially provided with five equal-volume first bare cell placement areas, second bare cell placement areas, third bare cell placement areas, fourth bare cell placement areas and fifth bare cell placement areas, any one of the first bare cell placement areas, second bare cell placement areas, third bare cell placement areas, fourth bare cell placement areas and fifth bare cell placement areas is filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds, the directions of the bare cells stacked in the first bare cell placement area, the third bare cell placement area and the fifth bare cell placement area are parallel, and the directions of the bare cells stacked in the second bare cell placement area and the fourth bare cell placement area are parallel.

[0013] As an improvement to the battery cell structure of the utility model, the first battery cell and the second battery cell form a cylindrical main structure, the first direction and the second direction are perpendicular, the first direction is the axial direction of the battery cell structure, and the second direction is the radial direction of the battery cell structure.

[0014] As an improvement to the battery cell structure of the utility model, a first insulator is arranged between the first battery cell and the second battery cell.

[0015] As an improvement to the battery cell structure of the utility model, the battery cell structure also includes a third battery cell unit and / or a safety body electrically connected by multiple bare batteries, and the multiple bare batteries inside the third battery cell unit are stacked along a third direction of the battery cell structure, and the third direction intersects with the first direction and the second direction.

[0016] As an improvement to the battery cell structure of the present utility model, the third battery cell and / or the safety body accounts for 1 / 10 of the volume of the battery cell structure, the first battery cell accounts for 3 / 10 of the volume of the battery cell structure, and the second battery cell accounts for 6 / 10 of the volume of the battery cell structure.

[0017] As an improvement to the battery cell structure of the utility model, the safety body is completely filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds; or partially filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds, and the remaining space is stacked with multiple bare battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the implementation modes of the present invention, the following briefly introduces the drawings required for use in the description of the implementation modes. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural schematic diagram of the battery core structure of the utility model;

[0020] Figure 2 It is a schematic structural diagram of the bare cells of the second cell monomer in the utility model being stacked along the second direction of the cell structure;

[0021] Figure 3 It is a schematic structural diagram of the bare cells of the second cell monomer in the utility model being stacked along the first direction of the cell structure;

[0022] Figure 4 It is a structural schematic diagram of the second battery cell in the battery cell structure of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the third battery cell unit in the battery cell structure of the utility model;

[0024] Figure 6 It is a schematic diagram of the structure of the battery cell provided with a safety body in the utility model;

[0025] Figure 7 It is a schematic diagram of the battery structure in which a safety body is arranged at the bottom of the first battery cell and the second battery cell in the utility model;

[0026] Figure 8 It is a schematic diagram of the battery structure in which the third battery cell and the safety body are simultaneously provided in the utility model;

[0027] Fig. 9 It is a structural schematic diagram of the safety body in the utility model;

[0028] Fig.10 This is a schematic diagram of the structure of the utility model in which the battery core structure is an irregular shape;

[0029] Reference numerals:

[0030] 1- the first battery cell;

[0031] 2- the second battery cell;

[0032] 21-bare battery cell placement area;

[0033] a-bare battery

[0034] 211 - first bare cell placement area;

[0035] 212 - second bare cell placement area;

[0036] 213 - third bare cell placement area;

[0037] 214- fourth bare cell placement area;

[0038] 215-fifth bare cell placement area;

[0039] 22- isolation plate;

[0040] 3- the third battery cell;

[0041] 4-Safety body. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0044] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0047] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0049] Embodiment 1:

[0050] like Figure 1 As shown, a cell structure includes a first cell monomer 1 and a second cell monomer 2 electrically connected by multiple bare cells, multiple bare cells inside the first cell monomer 1 are stacked along the first direction of the cell structure, and multiple bare cells inside the second cell monomer 2 are stacked along the second direction of the cell structure, and the first direction and the second direction are not parallel. The design of this cell structure significantly improves the energy density and safety of the cell. First, through the electrical connection of multiple bare cells, the first cell monomer 1 and the second cell monomer 2 can jointly provide a greater energy output. This internal series connection method increases the total capacity of the cell, thereby meeting the application scenario with high energy demand. In addition, the bare cells inside the first cell monomer 1 and the second cell monomer 2 are stacked in different directions respectively. This design method makes the heat distribution inside the cell more uniform. During the charging and discharging process, the cell will generate a certain amount of heat. If the heat is unevenly distributed, it may cause the local temperature of the cell to be too high, thereby causing safety problems. The stacking design in two directions can effectively disperse the heat and reduce the risk of local temperature increase of the cell.

[0051] Preferably, the first battery cell 1 accounts for 1 / 10-9 / 10 of the volume of the main body, and the second battery cell 2 accounts for 1 / 10-9 / 10 of the volume of the main body. In a specific embodiment, the volume distribution of the first battery cell 1 and the second battery cell 2 in the main body can be adjusted according to the actual application requirements. When a higher energy density is required, the volume proportion of the first battery cell 1 can be increased to provide more energy storage capacity. On the contrary, when a longer service life or better heat dissipation performance is required, the volume proportion of the second battery cell 2 can be appropriately increased. Specifically, if the application scenario requires high energy density, for example, electric vehicles need to travel long distances, we can increase the volume ratio of the first battery cell 1, that is, design the volume of the first battery cell 1 to be 6 / 10 of the volume of the battery structure, and design the volume of the second battery cell 2 to be 4 / 10 of the battery structure, so that the battery provides more energy storage capacity to meet the needs of high energy density; if the application scenario pays more attention to the service life or heat dissipation performance of the battery, such as smart phones or laptops, we can increase the volume ratio of the second battery cell 2, that is, set the volume of the first battery cell 1 to 4 / 10 of the volume of the battery structure, and design the volume of the second battery cell 2 to be 6 / 10 of the volume of the battery structure, so that the second battery cell 2 provides better heat dissipation performance and longer service life.

[0052] Preferably, the first battery cell monomer 1 and / or the second battery cell monomer 2 are filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds, and in the axial direction of the battery structure, the capacity of the first battery cell monomer 1 is equivalent to the capacity of the second battery cell monomer 2. In this embodiment, any one of bicarbonate compounds, carbonate compounds and oxalate compounds can be selected as a filler, and each substance can produce carbon dioxide gas through decomposition reaction under appropriate conditions, isolating oxygen to a certain extent. Among them, taking sodium bicarbonate in bicarbonate compounds as an example, when the internal temperature of the battery reaches a certain level, the internal sodium bicarbonate begins to decompose and produce carbon dioxide. Carbon dioxide can effectively wrap a single battery and isolate oxygen, thereby reducing the risk of battery fire failure and improving the safety performance of the battery.

[0053] During the implementation process, there are three effective design schemes. First, when the first battery cell monomer 1 is filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds, taking bicarbonate compounds as an example, its excellent hygroscopicity can absorb the water vapor generated inside the battery cell, thereby preventing short circuit and corrosion inside the battery cell. The high stability of bicarbonate compounds makes it difficult for them to react chemically with other substances, which provides a guarantee for the safe and stable operation of the battery cell. In addition, the battery cell will produce acidic substances during use, which will accelerate the aging of the battery cell. However, bicarbonate compounds, as alkaline substances, can effectively neutralize these acidic substances, thereby slowing down the aging speed of the battery cell and extending its service life. Secondly, when the second battery cell monomer 2 is filled with bicarbonate compounds, it can still stably play its protective role in extreme cases such as high temperature or short circuit, reducing the occurrence of safety accidents. This design not only improves the safety of a single battery cell, but also improves the safety of the entire battery system. When a cell fails, bicarbonate compounds can absorb the heat generated in time and reduce the temperature inside the cell, thus preventing thermal runaway. Finally, when both cell monomers are filled with bicarbonate compounds, we will get a double protection effect. This not only absorbs water vapor and neutralizes acidic substances, but also provides protection in extreme conditions such as high temperature or short circuit, comprehensively improving the safety and stability of the cell. In addition, the dual protection effect further slows down the aging of the cell, thereby extending the service life of the battery. This is especially important for equipment that needs to run for a long time, because it ensures the continuous and stable operation of the equipment and reduces equipment failures and downtime caused by battery problems.

[0054] In the design of the cell capacity, the capacity of the first cell 1 is set to be equivalent to the capacity of each second cell 2. This design ensures that the power of each cell is balanced during the charge and discharge process of the cell group, avoiding performance degradation or damage caused by overcharge or overdischarge of a single cell. At the same time, the equal capacity design also simplifies the maintenance of the cell group, and only the cells of the same specification need to be replaced.

[0055] Preferably, a first insulator is provided between the first battery cell 1 and the second battery cell 2; the first insulator is made of a material resistant to high temperature and electrolyte corrosion, and is provided with positive and negative electrode welding routes. The first insulator not only effectively isolates the first battery cell 1 and the second battery cell 2, preventing the risk of short circuit and explosion between them, but also provides a stable channel for the connection of the battery cells through its positive and negative electrode welding routes. This design not only ensures the safety of the battery pack, but also improves its working efficiency and stability.

[0056] Embodiment 2:

[0057] like Figure 1-3 As shown, the difference from the present embodiment 1 is that the second cell unit 2 is provided with at least two bare cell placement areas 21, a separation plate 22 is provided between two adjacent bare cell placement areas 21, and the directions of the bare cells stacked in the two adjacent bare cell placement areas 21 are not parallel. Figure 1 As shown, since the bare battery cells will generate a certain amount of heat during operation, if the heat dissipation is poor, it may cause the battery cell performance to deteriorate or even be damaged. Therefore, by changing the stacking direction of the bare battery cells in two adjacent bare battery cell placement areas 21 in a non-parallel manner, the heat dissipation effect of the battery cells can be improved to a certain extent, and the durability and stability of the battery cells can be improved. In addition, since an isolation plate 22 is provided between the bare battery cell placement areas 21 in this embodiment, when a bare battery cell needs to be added, it is only necessary to add a new bare battery cell between two adjacent bare battery cell placement areas 21 without making large-scale changes to the entire battery cell structure. This design makes the expansion of the battery cells simpler and more convenient.

[0058] Specifically, Figure 2-3 The stacking method of two adjacent bare cells a placement area 21 is shown, such as Figure 2 As shown, it can be clearly observed that the bare cell a is stacked in an orderly manner in the width direction of the cell structure; Figure 3 In the embodiment, the bare cell a is stacked in an orderly manner in the height direction of the cell structure. Both stacking methods reflect the principle of efficient use of space in the cell structure. The cell design of this embodiment is not limited to the case of two bare cell a placement areas 21. In addition, although Figure 2-3 Two different bare cell stacking methods are shown, but this does not mean that they are limited to these two. In fact, the bare cell stacking method can be optimized according to specific application requirements to achieve higher energy density and better battery performance.

[0059] The other structures are the same as those in Example 1 and will not be described in detail here.

[0060] Embodiment 3:

[0061] like Figure 2-4As shown, the difference from the present embodiment 2 is that the second cell monomer 2 is sequentially provided with five equal-volume first bare cell placement areas 211, second bare cell placement areas 212, third bare cell placement areas 213, fourth bare cell placement areas 214 and fifth bare cell placement areas 215, any one of the first bare cell placement areas 211, second bare cell placement areas 212, third bare cell placement areas 213, fourth bare cell placement areas 214 and fifth bare cell placement areas 215 is filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds, the directions of the bare cells stacked in the first bare cell placement areas 211, third bare cell placement areas 213 and fifth bare cell placement areas 215 are parallel, and the directions of the bare cells stacked in the second bare cell placement areas 212 and fourth bare cell placement areas 214 are parallel. In the present embodiment, bicarbonate compounds, carbonate compounds and oxalate compounds can show significant effects. For example, solid sodium bicarbonate in bicarbonate compounds has acid neutralization and adsorption capabilities. It can effectively absorb and neutralize possible acidic substances, thereby providing anti-corrosion protection for the battery cell. In addition, the substance also has hygroscopic properties, which can absorb moisture in the air and maintain the dryness of the internal environment of the battery cell, thereby significantly enhancing the working stability of the battery cell and extending its service life.

[0062] In addition, the stacking directions of the bare cells in the first bare cell placement area 211, the third bare cell placement area 213, and the fifth bare cell placement area 215 are parallel. This parallel stacking design can make the heat transfer between the cells more uniform and prevent the cell from locally overheating during operation. At the same time, parallel stacking also makes the space utilization between the cells more reasonable and improves the overall energy density of the cell. The stacking directions of the bare cells in the second bare cell placement area 212 and the fourth bare cell placement area 214 are also parallel, but intersect with the directions of the first three placement areas. This arrangement design helps to enhance the overall stability of the cell and prevent the cell from shifting or tilting during operation. At the same time, this stacking method also makes the connection between the cells tighter and improves the overall seismic resistance of the cell.

[0063] Specifically, the direction of the bare cells a in the first bare cell placement area 211, the third bare cell placement area 213, and the fifth bare cell placement area 215 can be as follows: Figure 2 As shown, the cells are stacked in sequence along the first direction of the cell structure. Figure 2 As shown, the cells are stacked in sequence along the second direction of the cell structure. However, the direction of the bare cells a in the second bare cell placement area 212 and the fourth bare cell placement area 214 is not parallel to the stacking direction of the bare cells a in the first bare cell placement area 211, the third bare cell placement area 213 and the fifth bare cell placement area 215.

[0064] In a specific embodiment, there may be only the first bare cell placement area 211, the second bare cell placement area 212, the third bare cell placement area 213, and the fourth bare cell placement area 214, wherein the first bare cell placement area 211, the third bare cell placement area 213 and the second bare cell placement area 212, the fourth bare cell placement area 214 are stacked along non-parallel directions with the bare cells; there may also be only the first bare cell placement area 211, the second bare cell placement area 212, and the third bare cell placement area 213, wherein the first bare cell placement area 211, the third bare cell placement area 213 and the second bare cell placement area 212 are stacked along non-parallel directions.

[0065] The other structures are the same as those of Example 2 and will not be described in detail here.

[0066] Embodiment 4:

[0067] As shown in Figure 1, the difference from the present embodiment 1 is that the first battery cell 1 and the second battery cell 2 are formed into a cylindrical main structure, the first direction and the second direction are perpendicular, the first direction is the axial direction of the main structure, and the second direction is the radial direction of the main structure. In this embodiment, the first direction is defined as the axial direction of the cylindrical main structure, that is, the main extension direction of the battery cell, and the second direction corresponds to the radial direction of the cylindrical main structure, which is perpendicular to the axial direction. This design makes the battery cell more compact in terms of occupied space, which is conducive to arranging more battery cells in a limited space and improving energy density.

[0068] The other structures are the same as those in Example 1 and will not be described in detail here.

[0069] Embodiment 5:

[0070] like Figure 5-8 As shown, the difference from Example 4 is that it also includes a third battery cell 3 and / or a safety body 4 electrically connected by multiple bare cells, and the multiple bare cells inside the third battery cell 3 are stacked along the third direction of the battery structure, and the third direction intersects with the first direction and the second direction. The specific implementation includes three implementation methods. First, when the battery structure includes the third battery cell 3, the addition of the third battery cell 3 can expand the overall capacity of the battery structure, thereby improving the battery life of the device, and by reasonably designing the capacity and connection method of the third battery cell 3 (such as Figure 5As shown, the third battery cell 3 and the first battery cell 1 and the second battery cell 2 together form a stable triangular structure), which not only realizes load balancing between the battery cells and prolongs the service life of the entire battery cell, but also enhances the mechanical strength of the battery cell structure, making it less likely to deform or be damaged when subjected to external force. In this embodiment, the safety body 4 is designed as an annular structure surrounding the battery body to ensure that a protective barrier is formed between the first battery cell 1 and the second battery cell 2. In addition, the insulator is evenly distributed on the contact surface between the first battery cell 1, the second battery cell 2 and the safety body 4 to ensure that when abnormally high temperature occurs inside the battery cell, the insulator can melt quickly, allowing the protective gas to be smoothly discharged from the safety body 4 into the first battery cell 1 and the second battery cell 2.

[0071] In addition, in a specific embodiment, Figure 6 As shown, the direction of the safety body 4 can be along the second direction of the cylindrical body, or as shown in FIG. Figure 7 As shown, the unit of the first battery cell and the bottom of the second battery cell unit are arranged along the first direction, or other suitable angles are formed to facilitate the layout of the battery cell monomer and the safety body 4 inside the main body. In this embodiment, the first battery cell monomer 1 and the second battery cell monomer 2 are respectively located on both sides of the battery cell structure, and the safety body 4 can be located in the center or one side of the battery cell structure to protect the battery cell structure. In terms of the volume ratio of the battery cell structure, it can be adjusted according to actual needs. If the volume of the battery cell monomer is too large, it will occupy too much space inside the battery cell structure, resulting in too small a volume ratio of the safety body 4, which may affect the safety of the battery. If the volume of the battery cell monomer is too small, it may affect the capacity and performance of the battery. Therefore, in terms of the volume ratio of the battery cell structure, comprehensive consideration needs to be made to ensure that the safety and performance of the battery are optimally balanced.

[0072] Finally, in a specific embodiment, the design of the battery cell structure is as follows Figure 8 As shown, it includes a third battery cell 3 and a safety body 4. The third battery cell 3, the first battery cell 1, and the second battery cell 2 together form a stable triangular structure to ensure the stability of the structure. At the same time, the safety body 4 is arranged at the bottom of the first battery cell and the second battery cell and extends along the first direction, further enhancing the overall safety.

[0073] Preferably, the third battery cell 3 and / or safety body 4 occupy 1 / 10 of the volume of the battery cell structure, the first battery cell 1 occupies 3 / 10 of the volume of the battery cell structure, and the second battery cell 2 occupies 6 / 10 of the volume of the battery cell structure. The third battery cell 3 and the safety body 4 together occupy 1 / 10 of the volume of the battery cell structure, while the first battery cell 1 occupies 3 / 10 of the volume of the battery cell structure, and the second battery cell 2 occupies 6 / 10 of the volume of the battery cell structure. Such a design not only optimizes the spatial layout of the battery cell structure, but also improves the stability and safety of the entire battery cell structure. At the same time, this design comprehensively considers the needs of the third battery cell 3 and the safety body 4 to ensure their structural compatibility and functional complementarity.

[0074] In actual applications, the volume ratio of the cell structure and each cell can be adjusted according to specific needs and conditions to achieve the best balance between performance and cost. At the same time, factors such as the stability and safety of the cell structure in actual use need to be considered to ensure the normal operation of the equipment and the safe use of the user.

[0075] Preferably, Fig. 9 As shown, the safety body 4 is completely filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds; or partially filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds, and the remaining space is stacked with multiple bare cells. Among them, taking bicarbonate compounds as an example, this design plays a dual role here: on the one hand, as an inorganic salt, it has excellent hygroscopic properties, which can effectively reduce the humidity in the cell structure and prevent the bare cell from short circuiting due to moisture; on the other hand, under certain conditions, bicarbonate compounds, carbonate compounds and oxalate compounds can all be rapidly decomposed at high temperatures to produce carbon dioxide gas, forming a protective film to further protect the bare cell from the external environment. Therefore, when the safety body 4 is completely filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds, it can play a comprehensive protective role, thereby forming a protective barrier inside the cell, effectively preventing thermal runaway and explosion of the cell.

[0076] In another design, the safety body 4 is partially filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds, and the remaining space is stacked with multiple bare cells. This design not only retains the protective layer, but also makes full use of the space and improves the energy density of the battery.

[0077] The other structures are the same as those of the fourth embodiment and will not be described in detail here.

[0078] Embodiment 6:

[0079] like Fig.10As shown, what is different from the present embodiment 5 is that the safety body 4 is a structure with a regular shape or an irregular shape together with the first battery cell 1 and the second battery cell 2. In the present embodiment, the shape design of the safety body 4 and the first battery cell 1 and the second battery cell 2 is no longer limited to a regular shape. In order to optimize the efficiency and performance of the entire battery system, as shown in the figure, the safety body 4 and the first battery cell 1 and the second battery cell 2 are all irregularly shaped, aiming to achieve the best match in performance.

[0080] This irregular shape design allows the battery cells and the safety body 4 to better fit into the internal space of the battery system, reducing ineffective space occupation, thereby increasing the energy density of the entire system. At the same time, the irregular shape design can also optimize the heat transfer effect between the battery cells, reducing the risk of battery performance degradation due to heat accumulation. In addition, the irregular shape of the battery cells can also increase the contact area between them and the safety body 4, enhancing the connection strength and stability between the two, and improving the safety and reliability of the entire battery system.

[0081] The other structures are the same as those of the fifth embodiment and will not be described in detail here.

[0082] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0083] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell structure, characterized in that: The invention comprises a first battery cell monomer (1) and a second battery cell monomer (2) which are electrically connected by a plurality of bare battery cells, wherein the plurality of bare battery cells inside the first battery cell monomer (1) are stacked along a first direction of the battery cell structure, and the plurality of bare battery cells inside the second battery cell monomer (2) are stacked along a second direction of the battery cell structure, and the first direction and the second direction are not parallel.

2. The battery cell structure according to claim 1, characterized in that: The first battery cell (1) accounts for 1 / 10-9 / 10 of the volume of the battery cell structure, and the second battery cell (2) accounts for 1 / 10-9 / 10 of the volume of the battery cell structure.

3. The battery cell structure according to claim 1, characterized in that: The first battery cell monomer (1) and / or the second battery cell monomer (2) is filled with at least one of a bicarbonate compound, a carbonate compound and an oxalate compound, and in the axial direction of the battery cell structure, the capacity of the first battery cell monomer (1) is equivalent to the capacity of the second battery cell monomer (2).

4. The battery cell structure according to claim 1, characterized in that: The second battery cell unit (2) is provided with at least two bare battery cell placement areas (21), an isolation plate (22) is provided between two adjacent bare battery cell placement areas (21), and the directions of the bare battery cells stacked in the two adjacent bare battery cell placement areas (21) are not parallel.

5. The battery cell structure according to claim 4, characterized in that: The second cell monomer (2) is provided with five equal-volume first bare cell placement areas (211), second bare cell placement areas (212), third bare cell placement areas (213), fourth bare cell placement areas (214) and fifth bare cell placement areas (215) in sequence; any one of the first bare cell placement areas (211), the second bare cell placement areas (212), the third bare cell placement areas (213), the fourth bare cell placement areas (214) and the fifth bare cell placement areas (215) is filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds; the directions of the bare cells stacked in the first bare cell placement areas (211), the third bare cell placement areas (213) and the fifth bare cell placement areas (215) are parallel; and the directions of the bare cells stacked in the second bare cell placement areas (212) and the fourth bare cell placement areas (214) are parallel.

6. The battery cell structure according to claim 1, characterized in that: The first battery cell (1) and the second battery cell (2) form a cylindrical main body structure, the first direction and the second direction are perpendicular, the first direction is the axial direction of the battery cell structure, and the second direction is the radial direction of the battery cell structure.

7. The battery cell structure according to claim 1, characterized in that: A first insulator is provided between the first battery cell (1) and the second battery cell (2).

8. The battery cell structure according to any one of claims 1 to 7, characterized in that: It also includes a third battery cell unit (3) and / or a safety body (4) electrically connected by multiple bare battery cells, wherein the multiple bare battery cells inside the third battery cell unit (3) are stacked along a third direction of the battery cell structure, and the third direction intersects with the first direction and the second direction.

9. The battery cell structure according to claim 8, characterized in that: The third battery cell (3) and / or the safety body (4) account for 1 / 10 of the volume of the battery cell structure, the first battery cell (1) accounts for 3 / 10 of the volume of the battery cell structure, and the second battery cell (2) accounts for 6 / 10 of the volume of the battery cell structure.

10. The battery cell structure according to claim 8, characterized in that: The safety body (4) is completely filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds; or partially filled with at least one of bicarbonate compounds, carbonate compounds and oxalate compounds, and the remaining space is stacked with multiple bare cells.

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