Battery monomer shell, battery monomer and battery pack

Abstract

The embodiment of the utility model provides a battery monomer shell, a battery monomer and a battery pack, and the battery monomer shell comprises a side enclosure wall and a bottom wall body; an opening is formed in one side, in the first direction, of the side enclosure wall; the bottom wall body is arranged on the side, opposite to the opening, of the side enclosure wall in the first direction so that a containing cavity communicated with the opening can be defined by the bottom wall body and the side enclosure wall together. Wherein the bottom wall body is provided with a first surface and an electrode supporting part, the first surface is located on the side, close to the containing cavity, of the bottom wall body, and the electrode supporting part is located in the containing cavity and protrudes out of the first surface. By adopting the battery monomer shell provided by the embodiment of the invention, the production efficiency can be improved, and the manufacturing cost can be saved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell housing, a battery cell, and a battery pack. Background Technology

[0002] In related technologies, the battery cells of lithium batteries generally have electrode components set inside the casing. Since the bottom wall of the casing is generally planar, an angle is formed between the bottom wall and the side wall of the casing. The electrode components generally have right-angled sides. Therefore, in order to avoid interference between the electrode components and the casing near the end of the angle, which would cause damage to the electrode components, a support such as a pad is usually placed on the bottom wall. The electrode components are placed on the pads, so that the support of the pads and other support components can prevent the electrode components from interfering with the casing.

[0003] However, this method not only requires the manufacturing process of placing support components such as gaskets, but also increases the manufacturing cost of individual battery cells. Utility Model Content

[0004] The embodiments of this application aim to provide a battery cell casing, battery cell, and battery pack that can both improve production efficiency and save manufacturing costs.

[0005] To achieve the above objectives, one embodiment of this application provides a battery cell housing, comprising:

[0006] A side wall, wherein the side wall has an opening on one side along a first direction;

[0007] A bottom wall body is disposed on the side of the side wall opposite to the opening along the first direction, so as to define a receiving cavity communicating with the opening together with the side wall; wherein, the bottom wall body has a first surface and an electrode support portion, the first surface is located on the side of the bottom wall body near the receiving cavity, and the electrode support portion is located in the receiving cavity and protrudes from the first surface.

[0008] In one embodiment, the bottom wall body has a second surface on the side opposite to the first surface, and a portion of the bottom wall body protrudes from the side containing the second surface toward the side containing the first surface to form the electrode support portion.

[0009] In one embodiment, the number of electrode supports is at least two, and the distance between two adjacent electrode supports is at least equal to the wall thickness of the bottom wall; and / or,

[0010] The battery cell housing includes corners that connect to the side wall and the bottom wall respectively, and the height of the electrode support protruding from the first surface along the first direction is less than or equal to the inner radius of the corner.

[0011] In one embodiment, the number of electrode supports is one, and the supporting area of ​​the electrode support accounts for 20% to 80% of the sum of the supporting area of ​​the electrode support and the area of ​​the first surface; or,

[0012] The number of electrode supports is at least two, and the sum of the support areas of each electrode support accounts for 20% to 80% of the sum of the support areas of each electrode support and the area of ​​the first surface.

[0013] In one embodiment, the bottom wall has a valve mounting boss and a pressure relief port. The valve mounting boss is located inside the receiving cavity and protrudes from the first surface. The pressure relief port communicates with the receiving cavity and penetrates the valve mounting boss.

[0014] In one embodiment, the bottom wall has a pressure relief port communicating with the receiving cavity, and the pressure relief port has a plurality of electrode supports on at least one side of the first surface. The plurality of electrode supports are spaced apart so that at least one flow channel is formed at the interval toward the pressure relief port.

[0015] In one embodiment, the pressure relief port is located on opposite sides of the first surface and has a plurality of electrode support portions.

[0016] In one embodiment, multiple electrode supports located on the same side of the pressure relief port are arranged in multiple rows and columns, with a flow channel formed between two adjacent rows of electrode supports, and a connecting channel connected to the flow channel formed between two adjacent electrode supports in the same row.

[0017] In one embodiment, a flow channel is formed between the installation area of ​​a plurality of electrode supports located on the same side of the pressure relief port and the side wall, with one end close to the pressure relief port, and the connecting channel flows through the flow channel.

[0018] In one embodiment, among the plurality of electrode supports located on the same side of the pressure relief port, at least two adjacent electrode supports are inclined relative to each other, so that a flow channel with a flow area that gradually decreases toward the pressure relief port is formed between the two relatively inclined electrode supports.

[0019] Another embodiment of this application provides a single battery cell, comprising:

[0020] The battery cell housing described above;

[0021] An electrode assembly is disposed within the receiving cavity and supported by the electrode support portion;

[0022] A cover plate, the cover plate being disposed over the opening;

[0023] At least two poles are disposed on the cover plate, and each pole is electrically connected to the electrode assembly.

[0024] In one embodiment, the bottom wall has a pressure relief port communicating with the receiving cavity, and the battery cell includes an explosion-proof valve disposed in the receiving cavity and located at the pressure relief port, the explosion-proof valve having a third surface on the side near the electrode assembly;

[0025] The height difference between the third surface and the first surface along the first direction is greater than 0; and / or,

[0026] The electrode support portion has an electrode support surface on the side near the opening, and the height difference between the electrode support surface and the third surface along the first direction is greater than 0.

[0027] Another embodiment of this application provides a battery pack, including the battery cells described above.

[0028] This application provides a battery cell housing, a battery cell, and a battery pack. The battery cell housing supports the electrode assembly of the battery cell by providing an electrode support portion on its bottom wall, which can effectively prevent interference between the electrode assembly and the battery cell housing and thus prevent damage to the electrode assembly. Since the electrode support portion is part of the bottom wall, this arrangement does not require separate support components such as gaskets to support the electrode assembly. Therefore, it can not only improve production efficiency by eliminating the manufacturing process of placing support components such as gaskets, but also save manufacturing costs by eliminating the support components such as gaskets. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0030] Figure 2 for Figure 1 A schematic diagram of the battery cell from another perspective;

[0031] Figure 3 for Figure 1 A cross-sectional view of the battery cell shown;

[0032] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0033] Figure 5 for Figure 3 A magnified view of a section at point B in the middle;

[0034] Figure 6 for Figure 1The cross-sectional view of the battery cell casing shown in the figure indicates the flow direction of free electrolyte and / or high-pressure gas, as indicated by the straight arrows in the flow channels and the bidirectional arrows in the connecting channels.

[0035] Figure 7 This is a cross-sectional view of another battery cell casing according to an embodiment of this application. The straight arrows in the flow channel indicate the flow direction of the free electrolyte and / or high-pressure gas.

[0036] Explanation of reference numerals in the attached figures

[0037] 10. Battery cell housing; 10a. Receiving cavity; 10b. Flow channel; 10c. Connecting channel; 10d. Flow channel; 11. Side wall; 12. Bottom wall; 12a. First surface; 12b. Electrode support; 12ba. Electrode support surface; 12c. Second surface; 12d. Groove; 12e. Pressure relief port; 12f. Valve mounting boss; 20. Electrode assembly; 13. Corner; 30. Cover plate; 40. Terminal post; 50. Explosion-proof valve; 50a. Third surface. Detailed Implementation

[0038] In the description of the embodiments in this application, it should be noted that the term "first direction" refers to the direction based on the attached... Figure 3 The orientations or positional relationships shown are for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element 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 on the embodiments of this application.

[0039] This application provides a battery pack, which includes, but is not limited to, a lithium battery pack. Please refer to... Figures 1 to 3 A battery pack consists of individual battery cells, which can be one or more.

[0040] Please see Figures 1 to 3 The battery cell in this application embodiment includes a battery cell housing 10, an electrode assembly 20, a cover plate 30, and a terminal post 40.

[0041] Please see Figure 3 The battery cell housing 10 includes a side wall 11 and a bottom wall 12. The side wall 11 has an opening (not shown) on one side along a first direction, and the bottom wall 12 is disposed on the side of the side wall 11 opposite to the opening along the first direction, so as to define a receiving cavity 10a communicating with the opening together with the side wall 11.

[0042] In other words, the side wall 11 encloses the receiving space, and the bottom wall 12 and the opening of the side wall 11 are located on opposite sides of the side wall 11 along the first direction. The bottom wall 12 closes the side of the side wall 11 along the first direction opposite to the opening, so that the receiving space forms a receiving cavity 10a that communicates with the opening.

[0043] The side wall 11 can be composed of multiple planar walls, for example, Figure 1 The side wall 11 shown has four planar walls. The battery cell is a square battery cell. In other embodiments, the number of planar walls may be three or more.

[0044] In other embodiments, the side wall 11 may also be curved; for example, the battery cell may be a circular battery cell.

[0045] Please continue reading. Figures 3 to 6 The bottom wall 12 has a first surface 12a and an electrode support portion 12b. The first surface 12a is located on the side of the bottom wall 12 near the receiving cavity 10a, and the electrode support portion 12b is located inside the receiving cavity 10a and protrudes from the first surface 12a.

[0046] Please see Figures 3 to 6 The electrode assembly 20 is disposed within the receiving cavity 10a and supported by the electrode support portion 12b. That is, the electrode assembly 20 is placed on the electrode support portion 12b so that the electrode support portion 12b can support the electrode assembly 20.

[0047] The number of electrode supports 12b can be one or at least two.

[0048] Please see Figures 3 to 6 The first surface 12a of the bottom wall 12 is equivalent to a part of the inner wall surface of the receiving cavity 10a (the other part of the inner wall surface of the receiving cavity 10a is the surface of the side wall 11 on the side close to the receiving cavity 10a).

[0049] The electrode support portion 12b is a protruding structure of the bottom wall 12 that protrudes from the first surface 12a. It can be understood that the electrode support portion 12b is a part of the bottom wall 12 and is an inseparable part of the bottom wall 12.

[0050] Please see Figure 3 and Figure 4 The bottom wall 12 has a second surface 12c on the side opposite to the first surface 12a. The second surface 12c of the bottom wall 12 is essentially a portion of the outer wall surface of the receiving cavity 10a (the other portion of the outer wall surface of the receiving cavity 10a is the surface of the side wall 11 facing away from the receiving cavity 10a). For example, please refer to... Figures 2 to 4A portion of the bottom wall 12 can protrude from the side containing the second surface 12c toward the side containing the first surface 12a to form an electrode support portion 12b. In other words, a portion of the bottom wall 12 can protrude entirely toward the side containing the first surface 12a, so that while forming the electrode support portion 12b protruding from the first surface 12a, the bottom wall 12 also forms a groove 12d corresponding to the electrode support portion 12b on the side containing the second surface 12c. For ease of manufacturing, the electrode support portion 12b can be formed by stamping.

[0051] In other embodiments, the electrode support portion 12b may only protrude from the first surface 12a, while the side where the second surface 12c is located will not form a groove 12d corresponding to the electrode support portion 12b. This is equivalent to the bottom wall body 12 being provided with a main body having a first surface 12a and a second surface 12c, with the electrode support portion 12b disposed on the first surface 12a and integrally formed with the main body.

[0052] For a battery cell housing 10 with at least two electrode support portions 12b, in order to facilitate manufacturing, it is preferable that the distance between two adjacent electrode support portions 12b can be at least equal to the wall thickness of the bottom wall 12. That is, the distance between two adjacent electrode support portions 12b can be greater than or equal to the wall thickness of the bottom wall 12.

[0053] Taking the electrode support portion 12b formed by stamping as an example, due to the influence of the stamping process, when the number of electrode support portions 12b is at least two, if the distance between two adjacent electrode support portions 12b is too small, the electrode support portion 12b is more prone to cracking due to large deformation during the stamping process. Therefore, setting the distance between two adjacent electrode support portions 12b to be at least equal to the wall thickness of the bottom wall 12 can better prevent the electrode support portion 12b from cracking due to stamping.

[0054] Please continue reading. Figure 1 and Figure 3 A cover plate 30 is placed over the opening, and an electrode post 40 is disposed on the cover plate 30. There are at least two electrode posts 40, and each electrode post 40 is electrically connected to the electrode assembly 20.

[0055] Please see Figure 3 and Figure 4 Since an angle is formed between the bottom wall 12 and the side wall 11, by providing the electrode support portion 12b to support the electrode assembly 20, the electrode assembly 20 can avoid the position of the battery cell housing 10 near the end of the angle (i.e., Figure 4The electrode assembly 20 is positioned at point D and its vicinity, thus effectively preventing interference between the electrode assembly 20 and the battery cell housing 10, which could cause damage to the electrode assembly 20. Since the electrode support 12b is part of the bottom wall 12, this arrangement eliminates the need for separate support components such as gaskets to support the electrode assembly 20. This not only improves production efficiency by eliminating the manufacturing process for placing support components like gaskets but also saves manufacturing costs.

[0056] Please see Figure 4 Some battery cell casings 10 will form corners 13 between the side wall 11 and the bottom wall 12, respectively connecting to the side wall 11 and the bottom wall 12. The end of the bottom wall 12 forming the angle with the side wall 11 is actually located at the corner 13. Please refer to Figure 4 In order to maximize the size of the electrode assembly 20 along the first direction and improve the utilization rate of the electrode assembly 20 along the first direction, preferably, the height H of the electrode support portion 12b protruding from the first surface 12a along the first direction can be less than the inner radius R of the corner 13, or it can be equal to the inner radius R of the corner 13.

[0057] For example, when the inner radius R of the corner 13 is 1mm, the height H of the electrode support 12b protruding from the first surface 12a in the first direction can be 0.2mm to 1.0mm (including the endpoint value). For example, the height H of the electrode support 12b protruding from the first surface 12a in the first direction can be 0.2mm, 0.5mm, 0.8mm, 1.0mm, etc.

[0058] The inner radius R of the corner 13 is actually the height dimension of the corner 13 relative to the first surface 12a along the first direction, or the height dimension of the boundary line between the corner 13 and the side wall 11 relative to the first surface 12a along the first direction. Therefore, when the height dimension H of the electrode support portion 12b protruding from the first surface 12a along the first direction is less than or equal to the inner radius R of the corner 13, it can better prevent the electrode assembly 20 from interfering with the battery cell housing 10, while minimizing the distance between the electrode assembly 20 and the first surface 12a, thereby maximizing the dimension of the electrode assembly 20 along the first direction.

[0059] In addition, generally speaking, the electrode support portion 12b supports the electrode assembly 20 by contacting the electrode assembly 20. When the area of ​​the electrode support portion 12b is too small, the contact area between the electrode assembly 20 and the electrode support portion 12b is insufficient, which may cause the side of the electrode assembly 20 closest to the electrode support portion 12b to be crushed by the electrode support portion 12b, resulting in a decrease in electrical performance and local metal ion deposition (for example, lithium deposition in the battery cells of a lithium battery pack). Therefore, in order to better prevent the electrode support portion 12b from crushing the electrode assembly 20, the support area of ​​the electrode support portion 12b (the support area is equivalent to the area in contact with the electrode assembly 20) should not be too small. For example, when the number of electrode support portions 12b is at least two, it is more preferable that the sum of the support areas of each electrode support portion 12b can account for 20% to 80% (including the endpoint value) of the sum of the support areas of each electrode support portion 12b and the area of ​​the first surface 12a, such as 20%, 50%, 80%, etc.

[0060] Please see Figure 4 and Figure 5 The electrode support portion 12b has an electrode support surface 12ba on the side near the opening. The electrode support surface 12ba supports the electrode assembly 20 by contacting the electrode assembly 20. The area of ​​the electrode support surface 12ba is the support area of ​​the electrode support portion 12b. When the number of electrode support portions 12b is at least two, the support area of ​​each electrode support portion 12b and the area of ​​the first surface 12a can satisfy the following relationship: (n×S1) / (n×S1+S0)=20%~80%, where S1 represents the area of ​​the electrode support surface 12ba, S0 represents the area of ​​the first surface 12a, and n represents the number of electrode support portions 12b.

[0061] by Figure 6 Taking the battery cell housing 10 shown as an example, the battery cell housing 10 in the figure has 24 electrode support portions 12b, then the above relationship is (24×S1) / (24×S1+S0)=20%~80%.

[0062] It is understood that when there is only one electrode support 12b, preferably, the supporting area of ​​the electrode support 12b can also account for 20% to 80% (including endpoint values) of the sum of the supporting area of ​​the electrode support 12b and the area of ​​the first surface 12a, for example, 20%, 50%, 80%, etc. That is to say, the supporting area of ​​the electrode support 12b and the area of ​​the first surface 12a can satisfy the following relationship: S1 / (S1+S0)=20%~80%.

[0063] In one embodiment, please refer to Figure 3 , Figure 5 and Figure 6The bottom wall 12 may be provided with a pressure relief port 12e communicating with the receiving cavity 10a. An explosion-proof valve 50 is installed at the pressure relief port 12e. When a battery cell experiences thermal runaway, if the pressure inside the receiving cavity 10a reaches the opening pressure of the explosion-proof valve 50, the explosion-proof valve 50 can open, allowing the free electrolyte and / or high-pressure gas inside the receiving cavity 10a to be discharged from the pressure relief port 12e. This reduces the pressure inside the receiving cavity 10a and prevents the battery cell from exploding due to excessive pressure.

[0064] The explosion-proof valve 50 can be connected to the bottom wall 12 by welding (such as laser welding).

[0065] Please see Figure 3 and Figure 6 The explosion-proof valve 50 in the figure is disposed in the receiving cavity 10a, and the explosion-proof valve 50 has a third surface 50a on the side near the electrode assembly 20. More preferably, the height difference between the electrode support surface 12ba of the electrode support portion 12b and the third surface 50a along the first direction can be greater than 0.

[0066] Specifically, under normal circumstances, a single battery cell is... Figure 1 and Figure 3 The cover plate 30 is placed with the bottom wall 12 facing down (this placement method can be called forward placement). The height difference between the electrode support surface 12ba and the third surface 50a along the first direction of the electrode support part 12b is greater than 0. This means that when the battery cell is placed forward, the height dimension of the electrode support surface 12ba relative to the first surface 12a is greater than the height dimension of the third surface 50a relative to the first surface 12a.

[0067] Since the electrode support portion 12b supports the electrode assembly 20 through the electrode support surface 12ba, the height difference between the electrode support surface 12ba of the electrode support portion 12b and the third surface 50a of the explosion-proof valve 50 along the first direction is greater than 0. This allows the third surface 50a of the explosion-proof valve 50 to form a gap with the electrode assembly 20, thereby effectively preventing the electrode assembly 20 from contacting the explosion-proof valve 50 and affecting the valve opening function of the explosion-proof valve 50.

[0068] Please continue reading. Figure 5 In order to avoid prolonged immersion of the explosion-proof valve 50 by the free electrolyte at the bottom of the receiving cavity 10a, which could corrode the third surface 50a of the explosion-proof valve 50 and lead to a shortened lifespan and damage to the valve opening function, it is preferable that the height difference between the third surface 50a and the first surface 12a along the first direction can be greater than 0. That is, when the battery cell is placed upright, the setting height of the third surface 50a is higher than that of the first surface 12a.

[0069] For example, please refer to Figure 3 and Figure 5 The bottom wall 12 can be provided with a valve mounting boss 12f. The valve mounting boss 12f is located in the receiving cavity 10a and protrudes from the first surface 12a. The pressure relief port 12e passes through the valve mounting boss 12f. The explosion-proof valve 50 can be installed on the valve mounting boss 12f.

[0070] In other words, the explosion-proof valve 50 can be supported by setting the valve mounting boss 12f so that when the battery cell is placed upright, the position of the third surface 50a can be higher than the first surface 12a.

[0071] In addition, by setting the valve mounting boss 12f, the distance between the explosion-proof valve 50 and the second surface 12c of the bottom wall 12 along the first direction can be increased, thereby better preventing the explosion-proof valve 50 from being impacted or contaminated by external foreign objects when the battery cell is placed upright or transported.

[0072] It should be noted that the bottom wall 12 is not limited to making the height difference between the third surface 50a and the first surface 12a in the first direction greater than 0 by setting the valve mounting boss 12f. In other embodiments, the height difference between the third surface 50a and the first surface 12a in the first direction can also be made greater than 0 by changing the structure of the explosion-proof valve 50.

[0073] In addition, the explosion-proof valve 50 is not limited to being installed in the receiving cavity 10a. In other embodiments, the explosion-proof valve 50 may also be installed on the side of the bottom wall 12 opposite to the receiving cavity 10a.

[0074] In one embodiment, please refer to Figure 6 and Figure 7 The pressure relief port 12e, located on at least one side of the first surface 12a, may have multiple electrode supports 12b. The number of electrode supports 12b may be two or more. The multiple electrode supports 12b are spaced apart so that at least one flow channel 10b is formed at the interval towards the pressure relief port 12e.

[0075] The flow channel 10b is used to guide the free electrolyte and / or high-pressure gas in the containment cavity 10a to the pressure relief port 12e when thermal runaway occurs in a single battery cell. This can increase the speed at which the free electrolyte and / or high-pressure gas are discharged from the pressure relief port 12e after the explosion-proof valve 50 is opened, thereby reducing the pressure in the containment cavity 10a more quickly.

[0076] Figure 6 and Figure 7The battery cell housing 10 shown has multiple electrode support portions 12b on opposite sides of the pressure relief port 12e located on the first surface 12a. In other words, flow channels 10b are formed on opposite sides of the pressure relief port 12e. This arrangement can not only further improve the speed at which free electrolyte and / or high-pressure gas are discharged from the pressure relief port 12e, but also improve the stability of the electrode support portion 12b supporting the electrode assembly 20.

[0077] In other embodiments, the pressure relief port 12e may have multiple electrode support portions 12b on each of its adjacent sides, or the pressure relief port 12e may have multiple electrode support portions 12b on each of its at least three sides.

[0078] In other embodiments, the pressure relief port 12e may have multiple electrode supports 12b on one side.

[0079] The manner in which multiple electrode supports 12b located on the same side of the pressure relief port 12e form the flow channel 10b is not limited. For example, in one embodiment, please refer to... Figure 6 Multiple electrode supports 12b located on the same side of the pressure relief port 12e can be arranged in multiple rows and columns. A flow channel 10b is formed between two adjacent rows of electrode supports 12b, and a connecting channel 10c connected to the flow channel 10b is formed between two adjacent columns of electrode supports 12b.

[0080] The multiple electrode supports 12b are arranged in multiple rows and columns, with at least two rows and two columns. That is, the multiple electrode supports 12b can form at least one flow channel 10b and at least two connecting channels 10c.

[0081] The connecting channel 10c can improve the flowability of free electrolyte and / or high-pressure gas. In particular, when the number of guiding channels 10b is greater than one, free electrolyte and / or high-pressure gas can flow from one guiding channel 10b to another guiding channel 10b through the connecting channel 10c. This can further increase the speed at which free electrolyte and / or high-pressure gas flow to the pressure relief port 12e by diverting the free electrolyte and / or high-pressure gas.

[0082] Additionally, please see Figure 6The area where multiple electrode support portions 12b are located on the same side of the pressure relief port 12e can also form a flow channel 10d with one end close to the pressure relief port 12e. Some free electrolyte and / or high-pressure gas can also flow along the flow channel 10d to eventually flow to the pressure relief port 12e. The connecting channel 10c can communicate with the flow channel 10d to allow some free electrolyte and / or high-pressure gas in the guiding channel 10b to flow to the flow channel 10d, or to allow some free electrolyte and / or high-pressure gas in the flow channel 10d to flow to the guiding channel 10b, thereby also playing a good role in diverting free electrolyte and / or high-pressure gas.

[0083] In another embodiment, please refer to Figure 7 Among the multiple electrode supports 12b located on the same side of the pressure relief port 12e, at least two partially adjacent electrode supports 12b can be inclined relative to each other, so that a flow channel 10b is formed between the two relatively inclined electrode supports 12b, with the flow area gradually decreasing towards the pressure relief port 12e. That is, only two partially adjacent electrode supports 12b can be inclined relative to each other, or any two adjacent electrode supports 12b can be inclined relative to each other. For the flow channel 10b formed between the two relatively inclined electrode supports 12b, the farther away from the pressure relief port 12e, the larger the flow area of ​​the flow channel 10b; the closer to the pressure relief port 12e, the smaller the flow area of ​​the flow channel 10b. This configuration not only facilitates the entry of free electrolyte and / or high-pressure gas from the end of the guide channel 10b away from the pressure relief port 12e, but also utilizes the change in flow area to increase the flow velocity of free electrolyte and / or high-pressure gas within the guide channel 10b (i.e., satisfying Bernoulli's law), thereby also helping to increase the speed at which free electrolyte and / or high-pressure gas flows toward the pressure relief port 12e.

[0084] In other embodiments, any two adjacent electrode supports 12b can also be arranged in parallel, that is, the flow area of ​​the flow channel 10b formed between two adjacent electrode supports 12b remains unchanged.

[0085] Additionally, it should be noted that the pressure relief port 12e is not limited to being provided on the bottom wall 12. In other embodiments, the pressure relief port 12e may also be provided on the side wall 11 or the cover plate 30.

[0086] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0087] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A battery cell housing, characterized by, Comprising: a side wall having an opening on one side in a first direction; a bottom wall body disposed on the side of the side wall opposite to the opening in the first direction to define a containing cavity in communication with the opening together with the side wall; wherein the bottom wall body has a first surface on the side of the bottom wall body close to the containing cavity and an electrode support part in the containing cavity and protruding from the first surface.

2. The battery cell housing of claim 1, wherein, The side of the bottom wall body opposite to the first surface has a second surface, and a part of the bottom wall body protrudes from the side where the second surface is located to the side where the first surface is located to form the electrode support part.

3. The battery cell housing according to claim 1 or 2, characterized in that The number of the electrode support parts is at least two, and the distance between two adjacent electrode support parts is at least equal to the wall thickness of the bottom wall body; and / or, The battery monomer shell comprises corners respectively connected with the side wall and the bottom wall body, and the height dimension of the electrode support part protruding from the first surface in the first direction is less than or equal to the inner radius of the corner.

4. The battery cell housing according to claim 1 or 2, characterized in that The number of the electrode support part is one, and the support area of the electrode support part accounts for 20% to 80% of the sum of the support area of the electrode support part and the area of the first surface; or, The number of the electrode support part is at least two, and the sum of the support areas of the electrode support parts accounts for 20% to 80% of the sum of the support areas of the electrode support parts and the area of the first surface.

5. The battery cell housing according to claim 1 or 2, characterized in that, The bottom wall body has a valve mounting boss in the containing cavity and protruding from the first surface and a pressure relief port in communication with the containing cavity and penetrating the valve mounting boss.

6. The battery cell housing of claim 1 or 2, wherein, The bottom wall body has a pressure relief port in communication with the containing cavity, and the pressure relief port has a plurality of electrode support parts on at least one side of the first surface, and the plurality of electrode support parts are arranged at intervals to form at least a flow guide channel towards the pressure relief port at the intervals.

7. The battery cell housing of claim 6, wherein, The pressure relief port has a plurality of electrode support parts on opposite sides of the first surface.

8. The battery cell housing of claim 6, wherein, The plurality of electrode support parts on the same side of the pressure relief port are arranged in multiple rows and multiple columns, the flow guide channel is formed between two adjacent rows of the electrode support parts, and a communication channel in communication with the flow guide channel is formed between two adjacent electrode support parts in the same row.

9. The battery cell housing of claim 8, wherein, The arrangement area of the plurality of electrode support parts on the same side of the pressure relief port and the side wall form a flow channel with one end close to the pressure relief port, and the communication channel and the flow channel flow.

10. The battery cell housing of claim 6, wherein, In the plurality of electrode support parts on the same side of the pressure relief port, at least part of two adjacent electrode support parts are oppositely inclined to form the flow guide channel with the flow area gradually decreasing towards the pressure relief port between the oppositely inclined two electrode support parts.

11. A battery cell, characterized by Comprising: The battery monomer shell of any one of claims 1-10; An electrode assembly disposed in the containing cavity and supported by the electrode support part; A cover plate covering the opening; At least two pole posts are arranged on the cover plate, and each of the pole posts is electrically connected with the electrode assembly.

12. The battery cell of claim 11, wherein, The bottom wall body has a pressure relief port in communication with the accommodating cavity, and the battery cell includes an explosion-proof valve arranged in the accommodating cavity and located at the pressure relief port, and a third surface is arranged on a side of the explosion-proof valve close to the electrode assembly; A height difference between the third surface and the first surface along the first direction is greater than 0. And / or, An electrode support surface is arranged on a side of the electrode support part close to the opening, and a height difference between the electrode support surface and the third surface along the first direction is greater than 0.

13. A battery pack, characterized by Comprise: The battery cell of claim 11 or 12.

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