Battery cell, battery, and electric device

Abstract

The embodiment of the application provides a battery monomer, a battery and a power utilization device, and relates to the technical field of batteries. The battery monomer comprises a shell with a first accommodating cavity; the shell has a first plate body, and a pole column and a liquid injection hole are arranged at the first plate body; a pole piece is accommodated in the first accommodating cavity; the pole piece comprises a main body part, the main body part is provided with a tab part on one side thereof along a first direction and close to the first plate body; the tab part is in electrical conduction with the pole column; the liquid injection hole has a first orthographic projection in the first direction, and at least part of the first orthographic projection is located on the tab part; and the tab part is provided with a buffer part. The tab part of the application can shield the liquid injection hole, the tab part and the buffer part on the tab part can buffer the impact force of electrolyte, direct impact of electrolyte on the battery cell is avoided, the battery cell is protected through the tab part, an additional shielding piece is avoided from being arranged to hinder injection of electrolyte into the shell through the liquid injection hole, and injection efficiency is avoided from being reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery cell, a battery, and an electrical device. Background Technology

[0002] A battery cell generally includes a casing and a cell housed within the casing. The casing has terminals and an electrolyte injection hole, and the cell has tabs extending outwards. The tabs are welded to the terminals. The electrolyte injection hole is directly opposite the cell along the height of the battery cell. When electrolyte is injected into the casing through the electrolyte injection hole, the electrolyte will directly impact the cell, which can easily damage the active material layer coated on the cell.

[0003] In related technologies, a shielding component is provided on the housing. The shielding component blocks the liquid injection hole inside the housing to prevent the electrolyte from directly flowing into the battery cell.

[0004] However, the aforementioned shielding components will affect the injection efficiency of electrolyte into the housing through the injection port. Utility Model Content

[0005] This application provides a battery cell, a battery, and an electrical device. By protecting the battery cell with the tabs, it avoids the need for additional obstructions to prevent the electrolyte from being injected into the casing through the injection hole, thus avoiding a reduction in injection efficiency.

[0006] Firstly, embodiments of this application provide a single battery cell, comprising:

[0007] The housing has a first receiving cavity; the housing has a first plate, and an electrode post and a liquid injection hole are provided at the first plate.

[0008] An electrode sheet is housed within the first receiving cavity; the electrode sheet includes a main body portion, and the main body portion is provided with an electrode tab portion along a first direction and on the side close to the first plate body, the first direction being the height direction of the electrode sheet; the electrode tab portion is electrically connected to the electrode post; the liquid injection hole has a first orthographic projection in the first direction, and at least a portion of the first orthographic projection is located on the electrode tab portion;

[0009] The electrode ear forms a buffer zone; a buffer section is provided within the buffer zone.

[0010] Secondly, embodiments of this application provide a battery, comprising,

[0011] The housing has a second receiving cavity;

[0012] As described above, the battery cell is housed within the first receiving cavity.

[0013] Thirdly, embodiments of this application provide an electrical device, including a battery cell as described above, or a battery as described above.

[0014] This application provides a battery cell, battery, and electrical device. The tab can at least partially block the electrolyte injection hole in a first direction, and the buffer on the tab can better buffer the impact force of the electrolyte. When electrolyte is injected into the first receiving cavity through the injection hole, the tab and the buffer can buffer the electrolyte injected from the injection hole, so that the electrolyte can smoothly fill the first receiving cavity under the buffering effect of the tab, thereby immersing the battery cell. This can prevent the electrolyte from directly impacting the battery cell and causing damage to the active material layer coated on the surface of the battery cell body. Furthermore, by protecting the battery cell with the tab, it is possible to avoid setting additional blocking members to obstruct the injection hole from injecting electrolyte into the casing, thus avoiding a reduction in injection efficiency. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0016] Figure 1 A first schematic diagram showing that the electrode tab is electrically connected to the electrode post on the first plate through an adapter piece, as provided in some embodiments of this application;

[0017] Figure 2 A second schematic diagram showing that the electrode tab is electrically connected to the electrode post on the first plate through an adapter piece in some embodiments of this application;

[0018] Figure 3 A third schematic diagram showing that the electrode tab is electrically connected to the electrode post on the first plate through an adapter piece in some embodiments of this application;

[0019] Figure 4 A fourth schematic diagram showing that the electrode tab is electrically connected to the electrode post on the first plate through an adapter piece in some embodiments of this application;

[0020] Figure 5 for Figure 4 A cross-sectional view of the middle pole ear in the AA direction;

[0021] Figure 6 A fifth schematic diagram showing that the electrode tab is electrically connected to the electrode post on the first plate through an adapter piece in some embodiments of this application;

[0022] Figure 7 A sixth schematic diagram provided for some embodiments of this application, showing that the tab is electrically connected to the electrode post on the first plate via an adapter piece;

[0023] Figure 8A seventh schematic diagram showing that the electrode tab is electrically connected to the electrode post on the first plate through an adapter piece in some embodiments of this application;

[0024] Figure 9 An eighth schematic diagram showing that the electrode tab is electrically connected to the electrode post on the first plate through an adapter piece in some embodiments of this application;

[0025] Figure 10 This is a ninth schematic diagram showing that the tab is electrically connected to the electrode post on the first plate through an adapter piece, as provided in some embodiments of this application.

[0026] Figure label:

[0027] 100. First plate;

[0028] 200, tab; 201, extension; 202, first side; 203, third side; 204, redundancy; 210, buffer zone; 220, opening; 221, second side; 230, first sub-tab; 240, second sub-tab; 250, recess;

[0029] 300. First orthographic projection;

[0030] 400, adapter plate.

[0031] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0032] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0033] First, let me explain the terms used in this application:

[0034] Battery cell: It can store chemical energy and controllably convert chemical energy into electrical energy. In a recyclable battery cell, the active materials can be activated by charging after discharge and continue to be used. The battery cell includes a casing and a cell disposed inside the casing.

[0035] Housing: A housing is a component used to provide a space to house electrode assemblies and other parts and isolate them from the external environment. A housing generally includes a body with an opening at at least one end and a receiving cavity. The opening of the housing can be closed by a cover plate, sealing and isolating the internal environment of the battery cell from the external environment. Housing materials include, but are not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and aluminum-plastic film.

[0036] Terminals: These are the "bridges" between the internal and external circuits of a battery. They are the core conductive components that connect the electrode assembly (positive / negative electrode) to external electrical appliances or charging devices. Their core function is to conduct the current generated by the electrochemical reaction inside the battery, or to introduce external current into the battery during charging. They are the key interface for realizing the input / output of electrical energy.

[0037] A battery cell is the component in a battery where electrochemical reactions occur; it is the smallest unit in a battery capable of performing electrochemical reactions such as charging and discharging. A battery cell is the basic unit of a battery and typically includes a positive electrode, a negative electrode, and a separator. Lithium-ion battery cells primarily function by the movement of lithium ions between the positive and negative electrodes. In cylindrical cells, a three-layer thin-film structure is wound into a cylindrical electrode assembly, while in cuboid cells, the thin-film structure is wound or stacked into an electrode assembly with a roughly cuboid shape.

[0038] Tabs: Tabs are located on one side of the positive / negative current collector and are formed separately from or integrally with the current collector. They are electrically connected to the current collector to conduct current through the corresponding current collector. Tabs are made of a highly conductive metal material (such as copper, aluminum, or nickel).

[0039] Adapter: It is a key connecting component in the battery system to achieve current conduction between different components. It is essentially a "conductive bridge" and is mainly used to solve the connection problems between different conductive units such as "electrode components, terminals, and external circuits" inside the battery or battery pack (such as size mismatch, position misalignment, material difference, etc.), to ensure stable and low-loss current transmission between various components.

[0040] Electrolyte: It is one of the core components of a battery. Its core function is to provide an ion transport channel between the positive and negative electrodes, ensuring that the electrochemical reaction can continue, while isolating electrons (to avoid short circuits). It is the key medium for the battery to realize the conversion of "chemical energy → electrical energy".

[0041] A battery cell generally includes a casing and a cell housed within the casing. The casing has terminals and an electrolyte injection hole, and the cell has tabs extending outwards. The tabs are welded to the terminals. The electrolyte injection hole is directly opposite the cell along the height of the battery cell. When electrolyte is injected into the casing through the electrolyte injection hole, the electrolyte will directly impact the cell, which can easily damage the active material layer coated on the cell.

[0042] In related technologies, a shielding component is provided on the housing. The shielding component blocks the liquid injection hole inside the housing to prevent the electrolyte from directly flowing into the battery cell.

[0043] However, the aforementioned shielding components will affect the injection efficiency of electrolyte into the housing through the injection port.

[0044] This application provides a battery cell, a battery, and an electrical device. The tab at least partially blocks the electrolyte injection hole in a first direction, and the buffer portion on the tab effectively cushions the impact of the electrolyte. When electrolyte is injected into the first receiving cavity through the injection hole, the tab and the buffer portion buffer the electrolyte injected from the injection hole, allowing the electrolyte to smoothly fill the first receiving cavity and immerse the battery cell. This prevents the electrolyte from directly impacting the battery cell and damaging the active material layer coated on the surface of the battery cell's main body. Furthermore, by protecting the battery cell with the tab, additional blocking components are avoided to prevent the injection hole from obstructing the injection of electrolyte into the casing, thus preventing a reduction in injection efficiency.

[0045] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0046] See Figure 1 , Figure 4 and Figure 5 As shown in the embodiment of this application, a battery cell is provided. The battery cell includes a casing and a cell. The casing has a first receiving cavity inside, and the cell is housed in the first receiving cavity. The casing also includes a first plate 100 for enclosing the first receiving cavity. A terminal post and an injection hole are provided on the first plate 100. The cell is formed by stacking multiple electrode sheets. Each electrode sheet includes a main body portion and a tab portion 200 extending from one side of the main body portion. The tab portion 200 is located on the side of the main body portion along a first direction X and close to the first plate 100, where the first direction X is the height direction of the electrode sheet. The tab portion 200 is electrically connected to the terminal post to realize current transmission in the battery cell. In this embodiment of the application, when the cell is housed in the first receiving cavity and the tab portion 200 is electrically connected to the terminal post, electrolyte can be injected into the first receiving cavity through the injection hole on the first plate 100 so that the cell can be immersed in the electrolyte.

[0047] See Figure 1 and Figure 2As shown, in the battery cell of this embodiment, the injection hole has a first orthographic projection 300 in the first direction X, and at least a portion of the first orthographic projection 300 falls on the tab 200, so that the tab 200 can at least partially block the injection hole in the first direction X. When electrolyte is injected into the first receiving cavity through the injection hole, under the blocking effect of the tab 200, at least a portion of the electrolyte will impact the tab 200. The tab 200 can buffer the electrolyte injected from the injection hole, so that the electrolyte can smoothly fill the first receiving cavity under the buffering effect of the tab 200, thereby immersing the battery cell. This can prevent the electrolyte from directly impacting the battery cell, which would damage the active material layer coated on the surface of the main body of the battery cell.

[0048] When the first orthographic projection 300 falls on the tab 200, see Figure 2 As shown, the tab 200 partially blocks the injection hole in the first direction X. When electrolyte is injected into the first receiving cavity through the injection hole, some electrolyte directly impacts the tab 200. While bearing the impact force of the electrolyte, the tab 200 can change the flow direction of the electrolyte impacting the tab 200. This allows the electrolyte impacting the tab 200 to obstruct and disturb the electrolyte not impacting the tab 200, thus enabling the electrolyte injected from the injection hole to fill the first receiving cavity more smoothly and contact the battery cell more gently.

[0049] When the first orthographic projection 300 falls entirely on the tab 200, see Figure 1 As shown, the tab 200 blocks the entire injection hole in the first direction X. When electrolyte is injected into the first receiving cavity through the injection hole, all the electrolyte directly impacts the tab 200, thereby enabling the tab 200 to buffer all the electrolyte, allowing the electrolyte to fill the first receiving cavity more smoothly and contact the battery cell more gently.

[0050] For the battery cell in this application embodiment, see [link to application]. Figure 2 , Figure 4 , Figure 6 and Figure 10 As shown, the tab 200 forms a buffer zone, and at least a portion of the first orthographic projection 300 falls within the tab 200. When electrolyte is injected into the first receiving cavity through electrolyte, at least a portion of the electrolyte will directly impact the tab 200, so that the tab 200 can buffer the impact force of at least a portion of the electrolyte, thereby slowing down the flow rate of the electrolyte, so that the electrolyte can fill the first receiving cavity more smoothly and contact the battery cell more gently.

[0051] Similarly, when the first orthographic projection 300 partially falls on the tab 200, see [reference needed]. Figure 2 and Figure 4 As shown, when electrolyte is injected into the first receiving cavity through the injection hole, some electrolyte directly impacts the tab 200. While bearing the impact force of the electrolyte, the tab 200 can change the flow direction of the electrolyte impacting the tab 200, thereby enabling the electrolyte impacting the tab 200 to obstruct and disturb the electrolyte not impacting the tab 200.

[0052] When the first orthographic projection 300 falls entirely on the tab 200, see Figure 6 and Figure 10 As shown, when electrolyte is injected into the first receiving cavity through the injection hole, all the electrolyte directly impacts the tab 200, thereby enabling the tab 200 to buffer all the electrolyte.

[0053] Furthermore, in this embodiment of the application, a buffer portion 210 is also provided on the tab portion 200. When at least a portion of the first orthographic projection 300 falls on the tab portion 200 and the buffer portion 210, the buffer portion 210 can impede and disturb the electrolyte, thereby improving the buffering effect of the tab portion 200 on the electrolyte.

[0054] In some implementations, see Figure 1 As shown, the battery cell includes an adapter piece 400 located within a first receiving cavity. The adapter piece 400 is welded to both the tab portion 200 and the terminal post to achieve electrical conductivity between the tab portion 200 and the terminal post. When the battery cell in this embodiment does not include the adapter piece 400, the tab portion 200 is directly welded to the terminal post to achieve electrical conductivity between the tab portion 200 and the terminal post.

[0055] In some implementations, see Figure 3 As shown, the tab portion 200 has an extension portion 201 along the second direction Y, where the second direction Y is perpendicular to the first direction X and the second direction Y is the length direction of the electrode sheet, wherein multiple stacked electrode sheets are wound along the second direction Y to form a battery cell.

[0056] Furthermore, after the adapter plate 400 is welded to the tab portion 200, there is a region in the tab portion 200 that is misaligned with the adapter plate 400 along the second direction Y. This region is the extension portion 201 of the tab portion 200, wherein the first orthographic projection 300 falls on the extension portion 201.

[0057] It is understandable that since both the electrode post and the injection hole are located on the first plate 100, the positions of the electrode post and the injection hole do not correspond in the first direction X. However, the tab 200 is electrically connected to the electrode post, causing the tab 200 to be closer to the electrode post in the second direction Y, resulting in a misalignment between the tab 200 and the injection hole in the second direction Y. In this embodiment, by extending the tab 200 in the second direction Y, the tab 200 can have a larger area, allowing it to correspond to the position of the injection hole in the first direction X. This ensures that the first orthographic projection 300 of the injection hole falls on the tab 200, enabling the tab 200 to shield the injection hole in the first direction X, thereby buffering the impact force of the electrolyte injected from the injection hole.

[0058] It is worth mentioning that, since the extension portion 201 is misaligned with the adapter piece 400 in the second direction Y, the extension portion 201 is not supported by the adapter piece 400 in the first direction X. In this state, when the electrolyte impacts the extension portion 201, the extension portion 201 can swing slightly in the first direction X. This allows the extension portion 201 to avoid the electrolyte directly impacting the battery cell, and the swinging of the extension portion 201 can better buffer the impact force of the electrolyte and prevent the extension portion 201 from being damaged by the impact of the electrolyte.

[0059] In some implementations, see Figure 3 As shown, when the first orthographic projection 300 falls on the extension 201, the first orthographic projection 300 has a first distance D1mm between it and the adapter piece 400 along the second direction Y, where 0mm≤D1mm≤100mm. For example, D1mm can be selected as 0mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, or 100mm.

[0060] It should be noted that since the adapter plate 400 can support the tab 200 in the first direction X, when the electrolyte impacts the tab 200, the adapter plate 400 can improve the structural stability and impact resistance of the tab 200. Therefore, the closer the first orthographic projection 300 is to the adapter plate 400 in the second direction Y, the better the impact resistance of the extension 201 and the better the structural stability of the extension 201 when impacted by the electrolyte.

[0061] As can be understood from the above, when D1mm > 100mm, the first orthographic projection 300 is far from the adapter piece 400 in the second direction Y. When the electrolyte impacts the extension 201, the structural stability of the extension 201 is poor, resulting in a poor ability to withstand impact forces. The electrolyte is prone to breaking through the extension 201 and directly impacting the battery cell. This embodiment of the application limits 0mm ≤ D1mm ≤ 100mm, so that the first orthographic projection 300 falling on the extension 201 can be closer to the adapter piece 400 in the second direction Y, thereby improving the structural stability of the extension 201 when impacted by the electrolyte and improving the ability of the extension 201 to withstand impact forces.

[0062] In some implementations, see Figures 1-3 and Figure 10 As shown, the buffer portion 210 includes an opening 220 disposed on the tab portion 200. The opening 220 penetrates the tab portion 200 along a first direction X, and divides the tab portion 200 into a first sub-tab portion 230 and a second sub-tab portion 240 along a second direction Y. In this embodiment, the first orthographic projection 300 falls on the first sub-tab portion 230 or the second sub-tab portion 240.

[0063] See Figures 1-3 and Figure 10 As shown, exemplarily, the first orthographic projection 300 is located on the first sub-electrode portion 230. That is, the electrode portion 200 blocks the injection hole in the first direction X through the first sub-electrode portion 230. When electrolyte is injected into the first receiving cavity through the injection hole, the electrolyte impacts the first sub-electrode portion 230, thereby enabling the electrode portion 200 to buffer at least part of the impact force of the electrolyte, thus slowing down the flow rate of the electrolyte, allowing the electrolyte to fill the first receiving cavity more smoothly and contact the battery cell more gently.

[0064] When the first orthographic projection 300 partially falls on the buffer portion 210, that is, when the first orthographic projection 300 partially falls on the opening 220, see [reference needed]. Figure 2 As shown, when electrolyte is injected into the first receiving cavity through the injection hole, a portion of the electrolyte flows directly into the first sub-electrode tab 230, and another portion flows directly into the opening 220. During this process, while the first sub-electrode tab 230 bears the impact force of the electrolyte, the first sub-electrode tab 230 can change the flow direction of the electrolyte impacting the first sub-electrode tab 230. This allows the electrolyte impacting the first sub-electrode tab 230 to obstruct and disturb the electrolyte flowing directly into the opening 220, thereby enabling the electrolyte injected from the injection hole to fill the first receiving cavity more smoothly and to contact the battery cell more gently.

[0065] When the first orthographic projection 300 falls entirely on the buffer portion 210, that is, when the first orthographic projection 300 falls entirely on the first sub-pole ear portion 230, see [reference needed]. Figure 1 , Figure 3 and Figure 10 As shown, the first sub-electrode tab 230 blocks the entire injection hole in the first direction X. When electrolyte is injected into the first receiving cavity through the injection hole, all the electrolyte directly impacts the first sub-electrode tab 230, thereby enabling the first sub-electrode tab 230 to buffer all the electrolyte, allowing the electrolyte to fill the first receiving cavity more smoothly and contact the battery cell more gently.

[0066] It is worth mentioning that, see Figures 1-3 and Figure 10 As shown, when the impact force of the electrolyte injected through the self-injection hole is too great, causing the first sub-electrode tab 230 to be torn, the opening 220 ensures that the tearing of the first sub-electrode tab 230 will not affect the second sub-electrode tab 240. The second sub-electrode tab 240 can still be stably connected to the adapter piece 400, ensuring electrical conductivity between the tab 200 and the terminal post, thereby improving the stability and safety of the battery cell in this embodiment.

[0067] In some implementations, see Figure 1 As shown, the opening 220 has a first width D2mm in the second direction Y, wherein 0.5mm ≤ D2mm ≤ 65mm. Exemplarily, D2mm can be selected from 0.5mm, 1mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, or 65mm.

[0068] Understandably, when D2mm > 65mm, the dimensions of the first sub-electrode lug 230 and the second sub-electrode lug 240 in the second direction Y are relatively small. This affects the conductivity between the lug 200 and the electrode post, and also reduces the structural strength of the first sub-electrode lug 230 and the second sub-electrode lug 240, making them more susceptible to tearing under the impact of electrolyte. This embodiment of the application, by limiting D2mm to 65mm (0.5mm ≤ D2mm ≤ 65mm), ensures that the dimensions of the first sub-electrode lug 230 and the second sub-electrode lug 240 in the second direction Y are relatively large. While maintaining the conductivity between the lug 200 and the electrode post, it also ensures better structural strength of the first sub-electrode lug 230 and the second sub-electrode lug 240, effectively buffering the electrolyte injected through the self-injection port.

[0069] In some implementations, see Figure 1As shown, the tab portion 200 has a first side 202 in the third direction Z, away from the main body portion. Here, the third direction Z is perpendicular to the first direction X and the second direction Y, and the third direction Z is the thickness direction of the electrode sheet. The opening 220 has a second side 221 in the third direction Z, close to the main body portion. A second distance D3mm exists between the first side 202 and the second side 221, where 0mm < D3mm ≤ 30mm. Exemplarily, D3mm can be selected from 0.1mm, 0.5mm, 1mm, 2mm, 5mm, 8mm, 10mm, 15mm, 20mm, 23mm, 27mm, or 30mm.

[0070] Understandably, when D3mm > 30mm, the opening 220 is too large, resulting in poor structural stability of the first sub-electrode tab 230 and the second sub-electrode tab 240. The first sub-electrode tab 230 and the second sub-electrode tab 240 are more easily torn under the impact of the electrolyte.

[0071] In this embodiment, by limiting 0mm < D3mm ≤ 30mm, the size of the opening 220 is moderate. On the one hand, this improves the buffering effect of the opening 220 as a buffer part 210 on the electrolyte. On the other hand, it ensures that the first sub-electrode tab 230 and the second sub-electrode tab 240 have good structural stability, and prevents the first sub-electrode tab 230 and the second sub-electrode tab 240 from being torn under the impact of the electrolyte.

[0072] In some implementations, see Figure 2 As shown, the tab portion 200 has a third side 203 in the second direction Y, close to the opening 220. The opening 220 and the third side 203 have a third distance D4mm along the second direction Y, wherein 5mm≤D4mm≤35mm. For example, D4mm can be selected as 5mm, 10mm, 15mm, 20mm, 25mm, 30mm or 35mm.

[0073] Understandably, when D4mm < 5mm, the size of the first sub-tab 230 is too large and the size of the second sub-tab 240 is too small in the second direction Y. Although the first sub-tab 230 has a good buffering effect on the electrolyte, when the first sub-tab 230 is torn, the structural strength of the second sub-tab 240 is also poor and it is easily torn, resulting in the inability to conduct electricity between the tabs 200 and the terminals. When D4mm > 35mm, the size of the first sub-tab 230 is too small and the size of the second sub-tab 240 is too large in the second direction Y. Although the second sub-tab 240 can stably connect to the adapter 400 and realize the electrical conduction between the tabs 200 and the terminals, the structural stability of the first sub-tab 230 is poor and it cannot buffer the electrolyte well, causing the electrolyte to easily flow directly into the cell.

[0074] In this embodiment, by limiting 5mm≤D4mm≤35mm, the opening 220 is centered on the tab 200 along the second direction Y, thereby making the dimensions of the first sub-tab 230 and the second sub-tab 240 similar in the second direction Y. This allows the first sub-tab 230 to provide a better buffering effect for the electrolyte while also improving the stability of electrical conduction between the tab 200 and the electrode post.

[0075] In some implementations, see Figure 1 As shown, a fourth distance D5mm exists between the first orthographic projection 300 on the first sub-pole ear 230 and the opening 220, where 0mm ≤ D5mm ≤ 135mm. Exemplarily, D5mm can be selected from 0mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 100mm, 110mm, 120mm, 130mm, or 135mm.

[0076] Since the opening 220 acts as a buffer portion 210 to buffer the electrolyte, the closer the first orthographic projection 300 is to the opening 220, the better the buffering effect of the tab portion 200 on the electrolyte.

[0077] Understandably, when D5mm > 135mm, the first orthographic projection 300 is far from the opening 220 in the second direction Y, resulting in a poor buffering effect of the opening 220. Furthermore, the first orthographic projection 300 is close to the side of the tab 200, making the first sub-tab 230 more prone to tearing under the impact of the electrolyte. This embodiment of the application, by limiting 0mm ≤ D5mm ≤ 135mm, allows the opening 220 to better buffer the electrolyte, while simultaneously ensuring that the first orthographic projection 300 is far from the side of the tab 200 in the second direction Y, thus preventing the first sub-tab 230 from tearing under the impact of the electrolyte.

[0078] In some implementations, see Figure 2 As shown, the portion of the first orthographic projection 300 coincides with the opening 220, that is, D5mm=0mm. In this embodiment of the application, when electrolyte is injected into the first receiving cavity through the injection hole, the opening 220, as a buffer part 210, can better buffer the electrolyte to slow down the flow rate of the electrolyte.

[0079] In some embodiments, the tab portion 200 has a first area S1mm in the first direction X. 2 The opening 220 has a second area S2mm in the first direction X.2 Where 10≤S1 / S2≤4000.

[0080] Understandably, when S1 / S2 < 10, the opening 220 on the tab 200 is too large, resulting in the first sub-tab 230 and the second sub-tab 240 being too small. This affects the structural stability of the first sub-tab 230 and the second sub-tab 240, making them less able to withstand the impact of the electrolyte, and more prone to tearing. When S1 / S2 > 4000, the opening 220 on the tab 200 is too small, resulting in a poor buffering effect of the opening 220 as a buffer part 210 on the electrolyte.

[0081] In this embodiment, by limiting 10≤S1 / S2≤4000, the opening 220 on the tab 200 is of a suitable size, which in turn makes the first sub-tab 230 and the second sub-tab 240 of suitable size. On the one hand, this can better buffer the electrolyte, and on the other hand, it can improve the structural stability of the first sub-tab 230 and the second sub-tab 240, making the first sub-tab 230 and the second sub-tab 240 less prone to tearing.

[0082] Furthermore, 250mm 2 ≤S1mm 2 ≤2450mm 2 ; and / or, 0.5mm 2 ≤S2mm 2 ≤2100mm 2 For example, S1mm 2 250mm can be selected 2 300mm 2 400mm 2 500mm 2 600mm 2 700mm 2 800mm 2 900mm 2 1000mm 2 1200mm 2 1400mm 2 1600mm 2 1800mm 2 2000mm 2 2200mm 2 2400mm 2 Or 2450mm 2 S2mm 2 0.5mm can be selected. 2 1mm2 100mm 2 400mm 2 600mm 2 800mm 2 1000mm 2 1200mm 2 1400mm 2 1600mm 2 1800mm 2 2000mm 2 Or 2100mm 2 .

[0083] In some implementations, see Figure 1 As shown, the first orthographic projection 300 has a fifth distance D6mm between it and the first side 202 along the third direction Z, where 0mm≤D6mm≤10mm. For example, D6mm can be selected as 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0084] It is understandable that when D6mm>10mm, the first orthographic projection 300 is located at the end of the tab 200 close to the main body, making the first orthographic projection 300 relatively close to the main body. When electrolyte is injected into the first receiving cavity through the injection hole, the electrolyte will sputter while impacting the first sub-tab 230. The sputtered electrolyte still has a large flow rate and a certain impact force, which may cause the sputtered electrolyte to impact the main body, resulting in the destruction of the active material layer on the main body.

[0085] By limiting 0mm≤D6mm≤10mm in this embodiment, the first orthographic projection 300 is located far from the main body on the tab 200, thereby avoiding the situation where electrolyte impacts the main body.

[0086] In some implementations, see Figure 2 As shown, the first orthographic projection 300 has a sixth distance D7mm between it and the edge of the tab 200 along the second direction Y, where 0mm≤D7mm≤35mm. For example, D7mm can be selected as 0mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm or 35mm.

[0087] In some implementations, see Figures 4-10 As shown, the buffer portion 210 includes a redundant portion 204 formed on the tab portion 200. The redundant portion 204 protrudes from the tab portion 200 in the direction of the first direction X toward the first plate 100, and a recess 250 is formed on the side of the tab portion 200 away from the first plate 100.

[0088] In this embodiment of the application, the first orthographic projection 300 is at least partially located in the buffer portion 210, that is, the first orthographic projection 300 is at least partially located on the redundant portion 204.

[0089] For example, see Figure 4 and Figure 8 As shown, a portion of the first orthographic projection 300 is located on the redundant portion 204, that is, a portion of the first orthographic projection 300 coincides with the redundant portion 204. When electrolyte is injected into the first receiving cavity through the injection hole, a portion of the electrolyte impacts the redundant portion 204, while another portion does not impact the redundant portion 204. In this state, the redundant portion 204 will undergo irregular deformation under the impact of the electrolyte. During the deformation process of the redundant portion 204, the redundant portion 204 can dissipate the impact force of the electrolyte impacting the redundant portion 204, and at the same time, the flow direction of the portion of electrolyte impacting the redundant portion 204 will change, so that the portion of electrolyte impacting the redundant portion 204 can obstruct and disturb the portion of electrolyte not impacting the redundant portion 204, thereby allowing the electrolyte injected from the injection hole to fill the first receiving cavity more smoothly and to contact the battery cell more gently.

[0090] Another example is seen in [reference 1]. Figure 6 , Figure 7 , Figure 9 and Figure 10 As shown, the first orthographic projection 300 is entirely located on the redundant part 204. That is, the entire first orthographic projection 300 coincides with the redundant part 204. When electrolyte is injected into the first receiving cavity through the injection hole, all the electrolyte directly impacts the redundant part 204, thereby enabling the redundant part 204 to buffer all the electrolyte, allowing the electrolyte to fill the first receiving cavity more smoothly and contact the battery cell more gently.

[0091] In some implementations, see Figure 4 As shown, the redundant part 204 has a first size M1mm along the second direction Y, wherein 1mm ≤ M1mm ≤ 6mm. For example, M1mm can be selected as 1mm, 2mm, 3mm, 4mm, 5mm or 6mm.

[0092] In some implementations, see Figure 4 As shown, the redundant part 204 has a second size M2mm along the third direction Z, wherein 10mm≤M2mm≤35mm. For example, M2mm can be selected as 10mm, 15mm, 20mm, 25mm, 30mm or 35mm.

[0093] In some implementations, see Figure 7As shown, there is a seventh distance D8mm between the edge of the redundant part 204 and the tab part 200, where 0mm≤D8mm≤8mm. For example, D8mm can be selected as 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm or 8mm.

[0094] It is understandable that when D8mm>8mm, the redundant part 204 is too close to the main body. When electrolyte is injected into the first receiving cavity through the injection hole, the electrolyte will splash while impacting the redundant part 204. The splashed electrolyte still has a large flow rate and a certain impact force, which may cause the splashed electrolyte to impact the main body, resulting in the destruction of the active material layer on the main body.

[0095] This application embodiment limits 0mm≤D8mm≤8mm so that the redundant part 204 is far away from the main body in the third direction Z, thereby avoiding the situation where the electrolyte impacts the main body.

[0096] In some implementations, see Figure 4 and Figure 8 As shown, when a portion of the first orthographic projection 300 coincides with the redundant portion 204, see [reference needed]. Figure 4 As shown, the edge of the first orthographic projection 300 that does not fall into the redundant part 204 has an eighth distance D9mm between it and the redundant part 204, where 0mm≤D9mm≤10mm. For example, D9mm can be selected as 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0097] In some implementations, see Figure 4 and Figure 6 As shown, the redundant part 204 is provided on the tab part 200, and the redundant part 204 can extend along the third direction Z, wherein the size of the redundant part 204 along the third direction Z is equal to the size of the tab part 200 along the third direction Z.

[0098] See Figure 8 and Figure 9 As shown, the redundant part 204 is disposed on the tab part 200, and the redundant part 204 can extend along the second direction Y, wherein the dimension of the redundant part 204 along the second direction Y is equal to the dimension of the tab part 200 along the second direction Y.

[0099] See Figure 7 As shown, the redundant portion 204 is disposed on the tab portion 200, and the dimension of the redundant portion 204 along the third direction Z is smaller than the dimension of the tab portion 200 along the third direction Z, and the dimension of the redundant portion 204 along the second direction Y is smaller than the dimension of the tab portion 200 along the second direction Y. Furthermore, the redundant portion 204 may be located at the middle position of the tab portion 200.

[0100] See Figure 10 As shown, an opening 220 and a redundant portion 204 are simultaneously provided on the tab portion 200. The opening 200 divides the tab portion 200 into a first sub-tab portion 230 and a second sub-tab portion 240 along the second direction Y. The redundant portion 204 may be provided on the first sub-tab portion 230 and / or the second sub-tab portion 240.

[0101] Secondly, this application provides a battery comprising the aforementioned battery cell, thus possessing the corresponding technical effects and advantages described above.

[0102] The battery in this embodiment of the application also includes a housing, the interior of which forms a second receiving cavity; the battery cells are housed in the second receiving cavity.

[0103] Furthermore, the number of battery cells can be set to multiple, with multiple battery cells simultaneously housed in the second receiving cavity, and the multiple battery cells interconnected by series or parallel connection.

[0104] Thirdly, the embodiments of this application provide an electrical device that includes the aforementioned battery cell or battery, and thus possesses the corresponding technical effects and advantages described above.

[0105] Finally, it should be noted that other embodiments of this utility model will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A single battery cell, characterized in that: include, The housing has a first receiving cavity; the housing has a first plate (100), and an electrode and a liquid injection hole are provided at the first plate (100); An electrode sheet is housed within the first receiving cavity; the electrode sheet includes a main body portion, and an electrode tab portion (200) is provided on the side of the main body portion along a first direction and close to the first plate (100), the first direction being the height direction of the electrode sheet; the electrode tab portion (200) is electrically connected to the electrode post; the injection hole has a first orthographic projection (300) in the first direction, and at least a portion of the first orthographic projection (300) is located on the electrode tab portion (200); The tab (200) forms a buffer zone; a buffer section (210) is provided in the buffer zone.

2. The battery cell according to claim 1, characterized in that: It also includes an adapter piece (400) located in the first receiving cavity, and the adapter piece (400) is welded to the tab (200) and the pole respectively.

3. The battery cell according to claim 2, characterized in that: The electrode tab (200) has an extension (201) in a second direction, which is perpendicular to the first direction and is the length direction of the electrode sheet; The extension (201) is misaligned with the adapter (400) in the second direction; the first orthographic projection (300) is located on the extension (201).

4. The battery cell according to claim 3, characterized in that: The first orthographic projection (300) has a first distance D1mm between itself and the adapter piece (400) along the second direction, wherein 0mm≤D1mm≤100mm.

5. The battery cell according to claim 3, characterized in that: The buffer portion (210) includes an opening (220) disposed on the tab portion (200); the opening (220) divides the tab portion (200) into a first sub-tab portion (230) and a second sub-tab portion (240) along the second direction; the first orthographic projection (300) portion is located on the first sub-tab portion (230) or the second sub-tab portion (240).

6. The battery cell according to claim 5, characterized in that: The opening (220) has a first width D2mm in the second direction, wherein 0.5mm≤D2mm≤65mm.

7. The battery cell according to claim 6, characterized in that: The tab portion (200) has a first side (202) away from the main body portion along a third direction, the third direction being perpendicular to the first direction and the second direction, and the third direction being the thickness direction of the electrode sheet; The opening (220) has a second side (221) close to the main body in the third direction; there is a second distance D3mm between the first side (202) and the second side (221), wherein 0mm < D3mm ≤ 30mm.

8. The battery cell according to claim 7, characterized in that: The tab portion (200) has a third side (203) close to the opening (220) along the second direction, and the opening (220) and the third side (203) have a third distance D4mm along the second direction, wherein 5mm≤D4mm≤35mm.

9. The battery cell according to any one of claims 5-8, characterized in that: There is a fourth distance D5mm between the first orthographic projection (300) and the opening (220), wherein 0mm≤D5mm≤135mm.

10. The battery cell according to any one of claims 5-8, characterized in that: A portion of the first orthographic projection (300) coincides with the opening (220).

11. The battery cell according to any one of claims 5-8, characterized in that: The tab portion (200) has a first area S1mm in the first direction. 2 The opening (220) has a second area S2mm in the first direction. 2 Where 10≤S1 / S2≤4000.

12. The battery cell according to claim 11, characterized in that: 250mm 2 ≤S1mm 2 ≤2450mm 2 ; and / or, 0.5mm 2 ≤S2mm 2 ≤2100mm 2 .

13. The battery cell according to claim 7, characterized in that: The first orthographic projection (300) has a fifth distance D6mm between the third-direction projection and the first side (202), wherein 0mm≤D6mm≤10mm.

14. The battery cell according to claim 13, characterized in that: The first orthographic projection (300) has a sixth distance D7mm between itself and the edge of the tab (200) in the second direction, wherein 0mm≤D7mm≤35mm.

15. The battery cell according to any one of claims 7-8, 13 and 14, characterized in that: The buffer portion (210) includes a redundant portion (204) formed on the tab portion (200), at least a portion of the redundant portion (204) protruding toward the first plate body (100) along the first direction, and a recess (250) is formed on the side of the tab portion (200) opposite to the first plate body (100).

16. The battery cell according to claim 15, characterized in that: At least a portion of the first orthographic projection (300) coincides with the redundant portion (204).

17. The battery cell according to claim 16, characterized in that: The first orthographic projection (300) is completely aligned with the redundant part (204).

18. The battery cell according to claim 16 or 17, characterized in that: The redundant part (204) has a first dimension M1mm along the second direction, wherein 1mm≤M1mm≤6mm; And / or, the redundant part (204) has a second size M2mm along the third direction, wherein 10mm≤M2mm≤35mm.

19. The battery cell according to claim 15, characterized in that: There is a seventh distance D8mm between the edge of the redundant part (204) and the edge of the tab part (200), wherein 0mm≤D8mm≤8mm.

20. The battery cell according to claim 16, characterized in that: When the first orthographic projection (300) coincides with the redundant part (204), there is an eighth distance D9mm between the edge of the first orthographic projection (300) that does not fall into the redundant part (204) and the redundant part (204), where 0mm≤D9mm≤10mm.

21. A battery, characterized in that: include, The housing has a second receiving cavity; The battery cell as described in any one of claims 1-20, wherein the battery cell is housed within the first receiving cavity.

22. An electrical appliance, characterized in that: It includes the battery cell as described in any one of claims 1-20, or the battery as described in claim 21.

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