Single battery and battery pack
By using a dual-chamber design and connecting components, the problems of structural complexity and low energy density of traditional lithium-ion batteries are solved, achieving higher energy density and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-03-17
AI Technical Summary
Traditional square aluminum-cased lithium-ion batteries have a single-cavity design, which results in more structural components and modules, increasing the battery size, weight and cost. They also suffer from low energy density, uneven wetting and poor thermoelectric separation.
The single cell adopts a dual-chamber design, which divides the inside of the casing into two chambers by a separator, and sets through holes in the separator to connect the two electrode groups. The connection components are used to achieve series connection, reducing structural components and increasing energy density.
It improves the energy density of individual cells, reduces costs, enhances wetting effect and thermoelectric separation, and strengthens battery safety and reliability.
Smart Images
Figure CN224005960U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of battery technology, specifically relating to a single cell battery and a battery pack. Background Technology
[0002] Currently, the market demand for high-power and high-energy-density lithium-ion batteries is increasing, while the demand for low-energy-density batteries is gradually decreasing. Traditional lithium-ion batteries are designed as regular square or cylindrical shapes, and the energy density is mainly improved through materials and voltage platforms. Structurally, the main approach is to optimize the cover plate to increase the internal space of the battery, thereby improving energy density.
[0003] However, traditional square aluminum-cased lithium-ion batteries are typically single-chambered, which results in a greater number of structural components and battery assembly modules (pack, Powertrain Assembly and Control Kit) required for square aluminum-cased batteries. This leads to an increase in battery size and weight, resulting in increased costs and a loss of energy density. Utility Model Content
[0004] The purpose of this utility model is to provide a single battery cell, which aims to overcome the technical problems of high assembly cost and low energy density of single-cavity battery casings; another purpose of this application is to provide a battery pack.
[0005] Technical solution: The single-cell battery disclosed in the embodiments of this application includes:
[0006] A shell assembly having a receiving cavity, the shell assembly including a partition disposed within the receiving cavity and dividing the receiving cavity into a first chamber and a second chamber, the partition having a through hole, the shell assembly also having a first through hole and a second through hole, the first through hole communicating with the first chamber and the second through hole communicating with the second chamber;
[0007] A connecting component is disposed within the through hole;
[0008] The first electrode assembly, housed within the first chamber, includes a first electrode tab and a second electrode tab, wherein the first electrode tab is connected to the connecting assembly;
[0009] The second pole assembly, housed within the second chamber, includes a third pole ear and a fourth pole ear, wherein the third pole ear is connected to the connecting assembly;
[0010] The first electrode post is disposed in the first through hole and electrically connected to the second electrode tab;
[0011] The second electrode post is disposed in the second through hole and electrically connected to the fourth electrode tab.
[0012] In some embodiments, the first electrode and the fourth electrode have the same polarity, and the second electrode and the third electrode have the same polarity.
[0013] In some embodiments, the connection component includes a first connector and a second connector, the first connector and the second connector are connected and pass through the through hole, the first connector is electrically connected to the first tab, and the second connector is electrically connected to the third tab.
[0014] In some embodiments, the connection assembly further includes an insulating seal that passes through the through hole and connects the first connector and the second connector respectively.
[0015] In some embodiments, the shell assembly includes a sidewall, a first cover plate, and a second cover plate; the first cover plate connects the sidewall and the partition respectively, and together they form a first chamber; the second cover plate connects the sidewall and the partition respectively, and together they form a second chamber.
[0016] The first cover plate and the partition plate have an included angle α, which satisfies α ≤ 90°;
[0017] The second cover plate and the partition plate have an included angle b, which satisfies b≤90°.
[0018] In some embodiments, the housing assembly has a width dimension D mm along the width direction of the individual battery cell, satisfying 20≤D≤50;
[0019] Along the height direction of the individual battery, the separator has a first dimension Hmm that is higher than the sidewall, satisfying 10≤H≤20.
[0020] In some embodiments, the single battery cell further includes a first explosion-proof valve and a second explosion-proof valve, wherein the first explosion-proof valve is disposed on the first cover plate and the second explosion-proof valve is disposed on the second cover plate.
[0021] In some embodiments, the first cover plate and the side wall, and the second cover plate and the side wall are all arranged along the height direction of the single battery cell;
[0022] The first cover plate is also provided with a first injection hole, and the second cover plate is also provided with a second injection hole. Along the height direction, the first injection hole is located near the side wall relative to the first explosion-proof valve, and the second injection hole is located near the side wall relative to the second explosion-proof valve.
[0023] In some embodiments, the sidewall forms an assembly opening at one end away from the first cover plate and the second cover plate;
[0024] The shell assembly also includes a third cover plate, which covers the assembly opening, and the third cover plate has the first through hole and the second through hole.
[0025] This application also discloses a battery pack, including the single battery cells as described in the above embodiments.
[0026] Beneficial Effects: The single-cell battery disclosed in this application includes a casing assembly, a connecting assembly, a first electrode group, and a second electrode group. The casing assembly has a receiving cavity and includes a separator disposed within the receiving cavity, dividing the receiving cavity into a first chamber and a second chamber. The separator has a through hole, and the casing assembly also has a first through hole and a second through hole. The first through hole connects to the first chamber, and the second through hole connects to the second chamber. The connecting assembly is disposed within the through hole. The first electrode group is housed within the first chamber and includes a first electrode tab and a second electrode tab. The first electrode tab is connected to the connecting assembly. The second electrode group is housed within the second chamber and includes a third electrode tab and a fourth electrode tab. The third electrode tab is connected to the connecting assembly. A first electrode post is disposed within the first through hole and electrically connected to the second electrode tab. The second electrode post is disposed within the second through hole and electrically connected to the fourth electrode tab. By setting a separator to divide the interior of the casing into a dual-chamber structure and by passing the connecting assembly through the separator, the first electrode group and the second electrode group are connected in series through the connecting assembly, thereby increasing the energy density of the single-cell battery, reducing the structural components required for the single-cell battery and the components required for the pack, and reducing costs.
[0027] The battery pack of this application embodiment includes the single battery cell as described in the above embodiments. Therefore, it can have all the technical features and effects of the single battery cell described above, which will not be repeated here. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0029] Figure 1 This is a schematic diagram of the structure of the casing assembly in a single battery cell according to an embodiment of this application;
[0030] Figure 2 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application. The diagram shows the assembly position relationship between the shell assembly and the connecting assembly.
[0031] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;
[0032] Figure 4 This is a schematic diagram of the structure of the first electrode group in a single cell according to an embodiment of this application;
[0033] Figure 5 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application. The diagram shows the first electrode group and the second electrode group, as well as the first electrode post and the second electrode post.
[0034] Reference numerals: 1. Shell assembly; 10. Receiving cavity; 11. Partition; 101. First chamber; 102. Second chamber; 103. First through hole; 104. Second through hole; 110. Through hole; 2. Connecting assembly; 3. First pole group; 31. First pole lug; 32. Second pole lug; 4. Second pole group; 41. Third pole lug; 42. Fourth pole lug; 5. First pole post; 6. Second pole post; 21. First connector; 22. Second connector; 23. Insulating seal; 12. Side wall; 13. First cover plate; 14. Second cover plate; X, width direction; Y, height direction; 7. First explosion-proof valve; 8. Second explosion-proof valve; 130. First injection hole; 140. Second injection hole; 120. Assembly port; 15. Third cover plate. Detailed Implementation
[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0036] In the description of this application, it should be understood that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, "multiple" means two or more, and "at least one" can refer to one, two, or more, unless otherwise explicitly specified. The terms "first," "second," and "third," etc., are only for the convenience of description and are used to name parts or embodiments by number, and do not imply any order of importance between the parts or embodiments.
[0037] It should also be noted that in the accompanying drawings of this application, the arrow marked X indicates the width direction, and the arrow marked Y indicates the height direction. The width and height directions are introduced in the description of this application to more clearly define the structure and relative positional relationships of the components in the individual battery cell and battery pack. In actual implementation, the width and height directions intersect each other. Optionally, the width and height directions are perpendicular to each other to optimize the layout of the individual battery cell and battery pack. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular; for example, an angle between 80° and 100° is considered perpendicular.
[0038] As a preamble to the embodiments of this application, traditional square aluminum-cased lithium-ion batteries are typically single-cavity, resulting in a greater number of structural components and battery assembly modules required for square aluminum-cased batteries. This leads to increased battery size and weight, resulting in increased cost and energy density loss. Furthermore, connecting multiple electrode groups in parallel indirectly increases the cell thickness. After placing them in a single cavity and injecting electrolyte, the wetting time of the electrode groups is prolonged and the wetting effect is poor, with variations in wetting effects across different areas. Over long-term use, this may lead to lithium plating due to poor wetting, thus shortening the lifespan of the lithium-ion battery. Moreover, with the positive and negative terminals and the explosion-proof valve located on the same side, the thermal separation effect is poor, and the battery safety performance needs improvement.
[0039] In view of this, embodiments of this application provide a single battery cell and a battery pack, which aim to solve at least one of the above-mentioned technical problems.
[0040] Please see Figures 1 to 5As shown, the single-cell battery provided in this application embodiment includes a casing assembly 1, a connecting assembly 2, a first electrode group 3, and a second electrode group 4. The casing assembly 1 has a receiving cavity 10, and includes a partition 11 disposed within the receiving cavity 10, dividing the receiving cavity 10 into a first chamber 101 and a second chamber 102. The partition 11 has a through hole 110. The casing assembly 1 also has a first through hole 103 and a second through hole 104, with the first through hole 103 communicating with the first chamber 101 and the second through hole 104 communicating with the second chamber. 102; Connecting assembly 2 is disposed within through hole 110; First electrode group 3 is housed within first chamber 101, including first electrode tab 31 and second electrode tab 32, the first electrode tab 31 being connected to connecting assembly 2; Second electrode group 4 is housed within second chamber 102, including third electrode tab 41 and fourth electrode tab 42, the third electrode tab 41 being connected to connecting assembly 2; First terminal 5 is disposed within first through hole 103 and electrically connected to second electrode tab 32; Second terminal 6 is disposed within second through hole 104 and electrically connected to fourth electrode tab 42. It should be understood that the casing assembly 1 provides external protection and isolation for the individual battery cell, and also serves to dissipate heat, prevent leakage, and provide mechanical support. It is an important component ensuring the performance and safety of the individual battery cell. By adding a partition 11 inside the receiving cavity 10, the receiving cavity 10 is divided into a first chamber 101 and a second chamber 102. The partition 11 serves to divide the space and also provides physical isolation, reducing the mutual influence between the first electrode group 3 and the second electrode group 4. By providing a through hole 110 in the partition 11 and installing a connecting component 2 inside the through hole 110, the connecting component 2 connects the first electrode group 3 and the second electrode group 4, realizing the electrical connection between the two electrode groups. The two electrode groups share a single housing component 1, which can reduce the weight of the single battery cell, increase the battery energy density, and reduce costs.
[0041] In some embodiments, the first tab 31 and the fourth tab 42 have the same polarity, and the second tab 32 and the third tab 41 have the same polarity. It should be understood that the first tab 31 and the second tab 32 have opposite polarities, and the third tab 41 and the fourth tab 42 have opposite polarities. By connecting the first tab 31 and the third tab 41 with opposite polarities to the connecting assembly 2, a series connection between the first electrode group 3 and the second electrode group 4 is achieved, thereby improving the energy density of the individual battery and increasing the output power of the individual battery.
[0042] Please see Figure 2 and Figure 3As shown, in some embodiments, the connecting component 2 includes a first connector 21 and a second connector 22. The first connector 21 and the second connector 22 are connected and pass through the through hole 110. The first connector 21 is electrically connected to the first electrode 31, and the second connector 22 is electrically connected to the third electrode 41. It should be understood that the first connector 21 is the positive electrode post, the second connector 22 is the negative electrode post, the first electrode 31 is the positive electrode post, and the third electrode 41 is the negative electrode post. Through the composite electrode post formed by the first connector 21 and the second connector 22, the first electrode group 3 and the second electrode group 4 are connected in series. By using the split structure of the first connector 21 and the second connector 22, on the one hand, the mutual influence between the first electrode group 3 and the second electrode group 4 can be reduced, ensuring the reliability and stability of the connection between a single connector and a single electrode group; on the other hand, if the first connector 21 or the second connector 22 is found to be non-compliant with quality standards during the inspection process, such as insufficient connection strength or poor conductivity, the non-compliant part can be adjusted or replaced individually without affecting the normal assembly of other parts, thus improving production efficiency and product qualification rate.
[0043] Please see Figure 5 As shown, in some embodiments, the connecting assembly 2 further includes an insulating seal 23, which passes through the through hole 110 and connects to the first connecting member 21 and the second connecting member 22 respectively. It should be understood that the insulating seal 23, sleeved on the first connecting member 21 and the second connecting member 22 and connecting them to the separator 11, effectively insulates the connecting assembly 2 from the separator 11, preventing short circuits inside the battery. Simultaneously, the insulating seal 23 seals the connection between the connecting assembly 2 and the separator 11, preventing electrolyte leakage and the intrusion of external substances. Furthermore, the insulating seal 23 also fixes and supports the connecting assembly 2, maintaining the stability of the internal electrical connections of the battery and ultimately extending the battery's lifespan.
[0044] Please see Figure 2 and Figure 3As shown, in some embodiments, the shell assembly 1 includes a sidewall 12, a first cover plate 13, and a second cover plate 14; the first cover plate 13 connects the sidewall 12 and the partition plate 11 respectively, and together they form a first chamber 101; the second cover plate 14 connects the sidewall 12 and the partition plate 11 respectively, and together they form a second chamber 102; the first cover plate 13 and the partition plate 11 have an included angle α, which satisfies α≤90°; the second cover plate 14 and the partition plate 11 have an included angle b, which satisfies b≤90°. It's important to understand that the angled design between the first cover plate 13 and the separator 11, and between the second cover plate 14 and the separator 11, serves two purposes. First, it enhances the stability of the separator 11. Second, it allows for sufficient space within the cavity to prevent damage caused by the electrode assembly squeezing the outer casing. Third, it increases the effective area within the cavity, allowing for more active material to be filled inside the casing assembly 1, thereby increasing the battery capacity. Furthermore, due to the reduced space at the top of the cavity, the electrolyte is more easily concentrated around the electrode assembly under gravity, reducing electrolyte accumulation in the empty top area. This improves electrolyte utilization, distribution, and wetting effect. The aforementioned structure also increases the heat dissipation area, creating more heat dissipation paths at the top and sides of the cavity.
[0045] Please see Figure 2 As shown, in some embodiments, along the width direction X of the individual battery cell, the housing assembly 1 has a width dimension D mm, satisfying 20 ≤ D ≤ 50; along the height direction Y of the individual battery cell, the separator 11 has a first dimension H mm protruding above the sidewall 12, satisfying 10 ≤ H ≤ 20. It should be understood that the height of the separator 11 above the sidewall 12 ensures the stability of the battery's internal structure. When the battery is subjected to vibration, impact, or tilting, the 10 mm to 20 mm protrusion prevents the electrode groups and electrolyte in the two chambers from mixing, avoiding safety accidents such as battery overheating and fire caused by electrode group short circuits. Simultaneously, this height design also ensures effective isolation between the two electrode groups under different usage environments and orientations, improving battery reliability.
[0046] Please see Figure 5 As shown, in some embodiments, the single battery cell further includes a first explosion-proof valve 7 and a second explosion-proof valve 8. The first explosion-proof valve 7 is disposed on the first cover plate 13, and the second explosion-proof valve 8 is disposed on the second cover plate 14. It should be understood that by placing the explosion-proof valves on the cover plates, the connecting assembly 2 and the explosion-proof valves are distributed on both sides of the electrode group, thereby achieving thermoelectric separation and improving the safety performance of the single battery cell.
[0047] Please see Figure 5As shown, in some embodiments, the first cover plate 13 and the side wall 12, and the second cover plate 14 and the side wall 12 are all arranged along the height direction Y of the single cell. The first cover plate 13 is also provided with a first injection hole 130, and the second cover plate 14 is also provided with a second injection hole 140. Along the height direction Y, the first injection hole 130 is located near the side wall 12 relative to the first explosion-proof valve 7, and the second injection hole 140 is located near the side wall 12 relative to the second explosion-proof valve 8. It should be understood that by opening the injection holes on the cover plate and positioning them near the side wall 12 relative to the explosion-proof valve, electrode liquid contamination of the explosion-proof valve can be avoided, achieving thermoelectric separation and improving the safety of the single cell. At the same time, the dual injection hole design further improves the uniformity of liquid injection and enhances the wetting effect of the cell.
[0048] Please see Figure 2 and Figure 5 As shown, in some embodiments, the sidewall 12 forms an assembly opening 120 at the end away from the first cover plate 13 and the second cover plate 14; the shell assembly 1 also includes a third cover plate 15, which covers the assembly opening 120, and has a first through hole 103 and a second through hole 104. It should be understood that the third cover plate 15 covers the assembly opening 120 and has the first through hole 103 and the second through hole 104 thereon, so that the battery can maintain good sealing while ensuring the assembly and maintenance of internal components. The fit between the third cover plate 15 and the assembly opening 120 can be achieved using sealing materials such as sealant or rubber gaskets to prevent electrolyte leakage and the entry of harmful substances such as external air and moisture into the battery.
[0049] This application also discloses a battery pack, including the single battery cells as described in the above embodiments. Therefore, it can possess all the technical features and effects of the aforementioned single battery cells, which will not be repeated here.
[0050] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.
[0051] The single-cell battery and battery pack provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A single cell, characterized by, The application relates to a battery cell, which comprises the following components: a shell assembly (1) having a containing cavity (10), the shell assembly (1) comprising a partition plate (11) arranged in the containing cavity (10) and dividing the containing cavity (10) into a first cavity (101) and a second cavity (102), the partition plate (11) being provided with a through hole (110), the shell assembly (1) further comprising a first through hole (103) and a second through hole (104), the first through hole (103) being communicated with the first cavity (101), and the second through hole (104) being communicated with the second cavity (102); a connecting assembly (2) arranged in the through hole (110); a first pole group (3) accommodated in the first cavity (101) and comprising a first pole lug (31) and a second pole lug (32), the first pole lug (31) being connected with the connecting assembly (2); a second pole group (4) accommodated in the second cavity (102) and comprising a third pole lug (41) and a fourth pole lug (42), the third pole lug (41) being connected with the connecting assembly (2); a first pole column (5) arranged in the first through hole (103) and electrically connected with the second pole lug (32); a second pole column (6) arranged in the second through hole (104) and electrically connected with the fourth pole lug (42).
2. The cell according to claim 1, wherein The first pole lug (31) and the fourth pole lug (42) have the same polarity, and the second pole lug (32) and the third pole lug (41) have the same polarity.
3. The cell according to claim 1, wherein The connecting assembly (2) comprises a first connecting piece (21) and a second connecting piece (22), the first connecting piece (21) and the second connecting piece (22) are connected and arranged in the through hole (110), the first connecting piece (21) is electrically connected with the first pole lug (31), and the second connecting piece (22) is electrically connected with the third pole lug (41).
4. The cell according to claim 3, wherein The connecting assembly (2) further comprises an insulating sealing piece (23), the insulating sealing piece (23) is arranged in the through hole (110) and connected with the first connecting piece (21) and the second connecting piece (22) respectively.
5. The cell according to claim 1, wherein The shell assembly (1) comprises a side wall (12), a first cover plate (13) and a second cover plate (14), the first cover plate (13) is connected with the side wall (12) and the partition plate (11) respectively and jointly forms the first cavity (101), and the second cover plate (14) is connected with the side wall (12) and the partition plate (11) respectively and jointly forms the second cavity (102); an included angle a between the first cover plate (13) and the partition plate (11) satisfies a<=90°; an included angle b between the second cover plate (14) and the partition plate (11) satisfies b<=90°.
6. The cell according to claim 5, wherein The shell assembly (1) has a width dimension D mm along a width direction (X) of the single battery cell, and 20<=D<=50 is satisfied; the partition plate (11) has a first dimension H mm higher than the side wall (12) along a height direction (Y) of the single battery cell, and 10<=H<=20 is satisfied.
7. The cell according to claim 5, wherein The monomer battery further comprises a first explosion-proof valve (7) and a second explosion-proof valve (8), the first explosion-proof valve (7) is arranged on the first cover plate (13), and the second explosion-proof valve (8) is arranged on the second cover plate (14).
8. The cell according to claim 7, wherein The first cover plate (13) and the side wall (12) and the second cover plate (14) and the side wall (12) are arranged along the height direction (Y) of the monomer battery. The first cover plate (13) is further provided with a first liquid injection hole (130), and the second cover plate (14) is further provided with a second liquid injection hole (140); along the height direction (Y), the first liquid injection hole (130) is arranged close to the side wall (12) relative to the first explosion-proof valve (7), and the second liquid injection hole (140) is arranged close to the side wall (12) relative to the second explosion-proof valve (8).
9. The cell according to claim 5, wherein The side wall (12) surrounds an assembly opening (120) at an end away from the first cover plate (13) and the second cover plate (14); The shell assembly (1) further comprises a third cover plate (15), the third cover plate (15) covers and seals the assembly opening (120), and the third cover plate (15) is provided with the first through hole (103) and the second through hole (104).
10. A battery pack, characterized by, The monomer battery as claimed in any one of claims 1 to 9. The monomer battery as claimed in any one of claims 1 to 9.