An electric cell
By combining the dual-electrode assembly with the cover plate assembly and using a spacer positioning design, the problems of high-capacity cell manufacturing difficulty and poor safety have been solved, achieving increased cell capacity, reduced cost, and improved safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNGROW POWER SUPPLY CO LTD
- Filing Date
- 2025-04-18
- Publication Date
- 2026-06-09
Smart Images
Figure CN224342362U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of battery technology, and specifically relates to a battery cell. Background Technology
[0002] For high-capacity battery cells, especially those that are quite long, the core length is also correspondingly long. Taking blade batteries as an example, the core length has certain limitations and cannot be increased indefinitely. Furthermore, as the thickness and length of the battery cells gradually increase, the following main problems arise:
[0003] 1. The longer and thicker the core, the more difficult the manufacturing process and the lower the yield.
[0004] 2. When the length is long, on the one hand, it is more difficult to manufacture, and on the other hand, the longer the core, the greater its own resistance, the higher the self-heating, and the worse the safety of the battery cell. Utility Model Content
[0005] To address the above problems, this utility model provides a battery cell, employing the following technical solution:
[0006] A battery cell includes: a housing having a hollow interior and open at both ends; a first electrode assembly disposed within the housing's cavity; a second electrode assembly disposed within the housing's cavity; a first cover plate assembly disposed at a first opening of the housing; the first cover plate assembly includes a first cover plate body and a first positive terminal and a first negative terminal disposed on the first cover plate body; the first electrode assembly is connected to the first positive terminal and the first negative terminal; a second cover plate assembly is disposed at a second opening of the housing; the second cover plate assembly includes a second cover plate body and a second positive terminal and a second negative terminal disposed on the second cover plate body; the second electrode assembly is connected to the second positive terminal and the second negative terminal.
[0007] Furthermore, the battery cell also includes a spacer, which is disposed within the receiving cavity of the housing and is located between the first electrode assembly and the second electrode assembly.
[0008] Furthermore, the number of the first electrode assemblies is at least two, and the at least two first electrode assemblies are stacked along the width direction of the housing.
[0009] Furthermore, the number of the second electrode assembly is at least two, and the at least two second electrode assemblies are stacked along the width direction of the housing.
[0010] Furthermore, the first electrode assembly includes a first electrode core body, and a first positive electrode tab and a first negative electrode tab connected to the first electrode core body, wherein the first positive electrode tab and the first negative electrode tab are disposed on the side of the first electrode core body facing the first cover plate assembly.
[0011] The second electrode assembly includes a second electrode core body, and a second positive electrode tab and a second negative electrode tab connected to the second electrode core body. The second positive electrode tab and the second negative electrode tab are disposed on the side of the second electrode core body facing the second cover plate assembly.
[0012] The first positive tab is connected to the first positive terminal, the first negative tab is connected to the first negative terminal, the second positive tab is connected to the second positive terminal, and the second negative tab is connected to the second negative terminal.
[0013] Furthermore, the first cover plate body or the first cover plate body is provided with a liquid injection hole.
[0014] Furthermore, the first electrode assembly and the second electrode assembly are arranged along the length direction of the housing.
[0015] Furthermore, the spacer ring has a cavity, and a plurality of reinforcing ribs are provided in the cavity. The plurality of reinforcing ribs are spaced apart, and the plurality of reinforcing ribs divide the cavity into a plurality of heat insulation cavities.
[0016] Furthermore, the reinforcing rib is plate-shaped, and multiple reinforcing ribs are parallel to each other. Each reinforcing rib is perpendicular to the two positioning sides of the spacer, wherein one positioning side contacts the first electrode assembly, and the other positioning side contacts the second electrode assembly.
[0017] Furthermore, it also includes an explosion relief valve, which is disposed on the housing, the first cover plate body or the second cover plate body.
[0018] The beneficial effects of this utility model are:
[0019] 1. In this embodiment of the utility model, two electrode assemblies are configured inside the housing. The two electrode assemblies are used in conjunction with different cover plate assemblies, resulting in a longer cell size and thus increasing the cell capacity.
[0020] 2. In this embodiment of the utility model, the two electrode components share a single housing, and the two electrode components are isolated and positioned by a spacer ring. The structure is simple, which reduces the difficulty and cost of the manufacturing process and improves the yield and assembly efficiency.
[0021] 3. In this embodiment of the invention, the tabs of the two electrode assemblies are respectively connected to the terminals on a cover plate assembly, which can reduce heat generation compared to existing battery cells and make the battery cell safer.
[0022] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 An isometric view of a battery cell according to an embodiment of the present invention is shown;
[0025] Figure 2 A side view of a battery cell according to an embodiment of the present invention is shown;
[0026] Figure 3 An exploded view of a battery cell according to an embodiment of the present invention is shown;
[0027] Figure 4 An isometric view of a cover plate assembly according to an embodiment of the present invention is shown;
[0028] Figure 5 A side view of a cover plate assembly according to an embodiment of the present invention is shown;
[0029] Figure 6 It shows Figure 5 A magnified view of a section at point A in the middle;
[0030] Figure 7 A schematic diagram of the spacer structure according to an embodiment of the present invention is shown.
[0031] In the diagram: 1. Shell; 2. First cover plate assembly; 3. Second cover plate assembly; 4. First electrode assembly; 5. Second electrode assembly; 6. Spacer; 7. Injection hole; 11. Receiving cavity; 21. First cover plate body; 22. First positive electrode post; 23. First negative electrode post; 31. Second cover plate body; 32. Second positive electrode post; 33. Second negative electrode post; 41. First electrode core body; 42. First positive electrode tab; 43. First negative electrode tab; 51. Second electrode core body; 211. Top cover plate; 222. Lower plastic; 223. Boss; 224. Groove; 61. Reinforcing rib; 62. Heat insulation cavity. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0033] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings.
[0034] This invention provides a battery cell that is longer and has a larger capacity, while reducing manufacturing difficulty and cost, improving yield and assembly efficiency, and also reducing battery cell heat generation, making the battery cell safer.
[0035] like Figure 1 The battery cell shown includes a housing 1, a first cover plate assembly 2, and a second cover plate assembly 3. The housing 1 has a hollow cavity 11 with openings at both ends. The first cover plate assembly 2 is disposed at the first opening of the housing 1, and the second cover plate assembly 3 is disposed at the second opening of the housing 1.
[0036] like Figure 2 As shown, the battery cell also includes a first electrode assembly 4 and a second electrode assembly 5. The first electrode assembly 4 and the second electrode assembly 5 are both disposed in the receiving cavity 11 of the housing 1. The first electrode assembly 4 and the second electrode assembly 5 share a housing 1, which allows the battery cell to be made longer, reduces costs, improves assembly efficiency, and also reduces the heat generation of the battery cell, making the battery cell safer.
[0037] like Figure 3 As shown, the first cover plate assembly 2 includes a first cover plate body 21 and a first positive electrode post 22 and a first negative electrode post 23 disposed on the first cover plate body 21. The first electrode group 4 is connected to the first positive electrode post 22 and the first negative electrode post 23.
[0038] like Figure 3As shown, the second cover plate assembly 3 includes a second cover plate body 31 and a second positive electrode post 32 and a second negative electrode post 33 disposed on the second cover plate body 31. The second electrode group 5 is connected to the second positive electrode post 32 and the second negative electrode post 33.
[0039] In this embodiment of the novel, the two electrode assemblies are used in conjunction with different cover plate assemblies, resulting in a longer cell size and thus an increased cell capacity.
[0040] For example, the shapes of the housing 1, the first cover plate assembly 2, and the second cover plate assembly 3 can be set as needed, and this utility model does not make specific limitations. For example, the housing 1, the first cover plate assembly 2, and the second cover plate assembly 3 can all be set as square.
[0041] like Figure 3 As shown, for example, the battery cell also includes a spacer 6, which is disposed in the receiving cavity 11 of the housing 1. The spacer 6 is located between the first electrode assembly 4 and the second electrode assembly 5. The main function of the spacer 6 is to provide insulation and prevent short circuits between the first electrode assembly 4 and the second electrode assembly 5, and it also has a positioning function.
[0042] The first electrode assembly 4 and the second electrode assembly 5 are isolated and positioned by a spacer ring 6. The structure is simple, the manufacturing process is easy, the cost is reduced, and the yield and assembly efficiency are improved.
[0043] The shapes of the first electrode assembly 4, the second electrode assembly 5, and the spacer 6 can be set as needed. For example, the first electrode assembly 4, the second electrode assembly 5, and the spacer 6 can all be set as square.
[0044] like Figure 3 As shown, for example, the number of first electrode components 4 is at least two, and at least two first electrode components 4 are stacked. For example, at least two first electrolysis components are stacked along the width direction of the housing 1.
[0045] For example, the number of second electrode components 5 is at least two, and at least two second electrode components 5 are stacked. For example, at least two second electrolysis components are stacked along the width direction of the housing 1.
[0046] like Figure 3 As shown, for example, the first electrode assembly 4 includes a first electrode core body 41, and a first positive electrode tab 42 and a first negative electrode tab 43 connected to the first electrode core body 41. For example, the first positive electrode tab 42 and the first negative electrode tab 43 are spaced apart on the side of the first electrode core body 41 facing the first cover plate assembly 2.
[0047] like Figure 3As shown, the second electrode assembly 5 includes a second electrode core body 51, and a second positive electrode tab and a second negative electrode tab connected to the second electrode core body 51. For example, the second positive electrode tab and the second negative electrode tab are spaced apart on the side of the second electrode core body 51 facing the second cover plate assembly 3.
[0048] The first positive electrode tab 42 is connected to the first positive electrode post 22, the first negative electrode tab 43 is connected to the first negative electrode post 23, the second positive electrode tab is connected to the second positive electrode post 32, and the second negative electrode tab is connected to the second negative electrode post 33.
[0049] In this embodiment of the invention, the tabs of the two electrode assemblies are respectively connected to the terminals on a cover plate assembly, which can reduce heat generation compared to existing battery cells and make the battery cell safer.
[0050] For example, both the first electrode core body 41 and the second electrode core body 51 include alternating positive electrode plates, separators, negative electrode plates, and separators.
[0051] like Figure 4 As shown, for example, the first cover plate body 21 or the first cover plate body 21 is provided with a liquid injection hole 7. For example, the liquid injection hole 7 is provided between the first positive electrode post 22 and the first negative electrode post 23, or between the second positive electrode post 32 and the second negative electrode post 33, to facilitate operation.
[0052] The first positive terminal 22 and the first negative terminal 23 are disposed alternately on the first cover plate body 21, and the second positive terminal 32 and the second negative terminal 33 are disposed alternately on the second cover plate body 31.
[0053] For example, the first electrode assembly 4 and the second electrode assembly 5 are arranged along the length of the housing 1, so that the battery cell can be made longer; the first electrode assembly 4 and the second electrode assembly 5 are mirror images of each other, so that the structure of the battery cell is more neat and beautiful; the side of the first electrode assembly 4 facing away from the first cover plate assembly 2 contacts the spacer 6, and the side of the second electrode assembly 5 facing away from the second cover plate assembly 3 contacts the spacer 6.
[0054] like Figure 5 and Figure 6 As shown, for example, the first cover plate body 21 and the second cover plate body 31 both include a top cover plate 211 and a lower plastic 222. The top cover plate 211 has a boss 223 on the side facing the housing 1. The boss 223 is inserted into the opening of the housing 1 for easy installation. For example, the outer periphery of the top cover plate 211 is flush with the outer periphery of the housing 1, making the battery cell more aesthetically pleasing.
[0055] The lower plastic 222 is provided on the side of the boss 223 facing the housing 1. The side of the lower plastic 222 facing the housing 1 is provided with two grooves 224. Each groove 224 is used to avoid a tab (positive tab or negative tab), thereby saving space.
[0056] For example, the first positive terminal 22 and the first negative terminal 23 are riveted to the first cover plate body 21, and the second positive terminal 32 and the second negative terminal 33 are riveted to the second cover plate body 31. The riveting process can be achieved by press riveting or spin riveting.
[0057] like Figure 7 As shown, for example, the spacer ring 6 has a cavity, and multiple reinforcing ribs 61 are provided in the cavity. The multiple reinforcing ribs 61 are spaced apart, and the multiple reinforcing ribs 61 divide the cavity into multiple heat insulation cavities 62. The reinforcing ribs 61 make the structure of the spacer ring 6 more stable, and the multiple heat insulation cavities 62 enable thermal isolation between the first electrode assembly 4 and the second electrode assembly 5.
[0058] For example, the reinforcing rib 61 is plate-shaped, and multiple reinforcing ribs 61 are parallel to each other. Each reinforcing rib 61 is perpendicular to the two positioning sides of the spacer ring 6. One positioning side is in contact with the first electrode assembly 4, and the other positioning side is in contact with the second electrode assembly 5. This makes the two ends of each reinforcing rib 61 supported on the two positioning sides of the electrode assembly in contact with the spacer ring 6, so that the spacer ring 6 is not easily deformed when squeezed.
[0059] For example, the battery cell also includes a pressure relief valve (not shown in the figure). The pressure relief valve can be installed on the housing 1, or on the first cover plate body 21 or the second cover plate body 31. The pressure relief valve is used for pressure release, safety protection and directional venting.
[0060] When the battery cell experiences rapid accumulation of internal gas (such as gas generated by electrolyte decomposition) due to overcharging, short circuit, high temperature, or uncontrolled internal chemical reaction (such as thermal runaway), the explosion relief valve will automatically open at a preset pressure threshold to quickly release the internal pressure and prevent the casing 1 from bursting.
[0061] The pressure relief valve reduces the risk of explosion and may also cut off internal circuitry (in part of the design) to prevent further energy release and thermal runaway, thus protecting the battery system and the surrounding environment.
[0062] The gas and ejected material are guided to exit in a specific direction by the explosion relief valve, avoiding direct impact on the battery module or surrounding equipment.
[0063] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A battery cell, characterized in that, include: The shell (1) has a cavity (11) that is hollow inside and open at both ends; The first electrode assembly (4) is disposed within the receiving cavity (11) of the housing (1); The second electrode assembly (5) is disposed within the receiving cavity (11) of the housing (1); The first cover plate assembly (2) is disposed at the first opening of the housing (1); the first cover plate assembly (2) includes a first cover plate body (21) and a first positive electrode post (22) and a first negative electrode post (23) disposed on the first cover plate body (21); the first electrode assembly (4) is connected to the first positive electrode post (22) and the first negative electrode post (23); The second cover plate assembly (3) is disposed at the second opening of the housing (1); the second cover plate assembly (3) includes a second cover plate body (31) and a second positive electrode post (32) and a second negative electrode post (33) disposed on the second cover plate body (31); the second electrode assembly (5) is connected to the second positive electrode post (32) and the second negative electrode post (33).
2. The battery cell according to claim 1, characterized in that, The battery cell also includes a spacer (6), which is disposed in the receiving cavity (11) of the housing (1) and is located between the first electrode assembly (4) and the second electrode assembly (5).
3. The battery cell according to claim 1, characterized in that, The number of the first electrode assembly (4) is at least two, and at least two first electrode assemblies (4) are stacked along the width direction of the housing (1).
4. The battery cell according to claim 1, characterized in that, The number of the second electrode assembly (5) is at least two, and at least two second electrode assemblies (5) are stacked along the width direction of the housing (1).
5. The battery cell according to claim 1, characterized in that, The first electrode assembly (4) includes a first electrode core body (41), and a first positive electrode tab (42) and a first negative electrode tab (43) connected to the first electrode core body (41). The first positive electrode tab (42) and the first negative electrode tab (43) are disposed on the side of the first electrode core body (41) facing the first cover plate assembly (2). The second electrode assembly (5) includes a second electrode core body (51), and a second positive electrode tab and a second negative electrode tab connected to the second electrode core body (51). The second positive electrode tab and the second negative electrode tab are disposed on the side of the second electrode core body (51) facing the second cover plate assembly (3). The first positive electrode tab (42) is connected to the first positive electrode post (22), the first negative electrode tab (43) is connected to the first negative electrode post (23), the second positive electrode tab is connected to the second positive electrode post (32), and the second negative electrode tab is connected to the second negative electrode post (33).
6. The battery cell according to claim 1, characterized in that, The first cover plate body (21) or the first cover plate body (21) is provided with a liquid injection hole (7).
7. The battery cell according to claim 1, characterized in that, The first electrode assembly (4) and the second electrode assembly (5) are arranged along the length of the housing (1).
8. The battery cell according to claim 2, characterized in that, The spacer ring (6) has a cavity, and a plurality of reinforcing ribs (61) are provided in the cavity. The plurality of reinforcing ribs (61) are spaced apart and divide the cavity into a plurality of heat insulation cavities (62).
9. The battery cell according to claim 8, characterized in that, The reinforcing rib (61) is plate-shaped, and the multiple reinforcing ribs (61) are parallel to each other. Each reinforcing rib (61) is perpendicular to the two positioning sides of the spacer (6). One positioning side is in contact with the first electrode assembly (4), and the other positioning side is in contact with the second electrode assembly (5).
10. The battery cell according to any one of claims 1-9, characterized in that, It also includes an explosion relief valve, which is disposed on the housing (1), the first cover plate body (21) or the second cover plate body (31).