Terminal posts, cell covers, batteries, and electrical equipment

Abstract

This application relates to an electrode post, a cell cover, a battery, and an electrical device, belonging to the technical field of batteries. The electrode post includes a plate portion and a post portion. The central axis of the post portion is parallel to the central axis of the plate portion and constrains the positional proportion of the plate portion on the cover, ensuring that the current is evenly distributed on both sides of the plate portion and avoiding localized temperature rise. This application solves the problems of unbalanced battery current distribution and localized temperature rise, ultimately improving battery safety and lifespan.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to terminals, cell covers, batteries, and electrical devices. Background Technology

[0002] With the development of lithium-ion battery technology, lithium-ion batteries have achieved technological breakthroughs in high energy density and long cycle life in electric vehicles and energy storage, and the requirements for performance and safety have also increased accordingly.

[0003] As a key component, the cell cover plate serves to form a sealed cavity by welding with the shell, lead out the positive and negative electrodes of the electrode group, and act as an assembly carrier. Traditional riveted structure cover plates use cylindrical electrode posts combined with riveting blocks, plastic parts, and aluminum sheets. To meet the requirements of lightweighting and high current carrying capacity, the industry has optimized the electrode post structure into a racetrack-shaped design to improve current carrying capacity.

[0004] However, the above-mentioned improvement plan still has the following problems:

[0005] Due to the limitations of the battery pack busbar welding layout, there is an offset between the center of the cell cover plate pole and the center line of the cell. The pole base plate adopts a centrally symmetrical design, which leads to a serious imbalance in the current passing through the base plates on both sides of the pole center line. That is, the left pole group needs to bear a larger current density, causing abnormal local temperature rise and affecting battery safety. Summary of the Invention

[0006] Therefore, it is necessary to provide a terminal post, cell cover plate, battery, and electrical equipment to address the above-mentioned problems and solve the risk of reduced cell safety performance caused by high local temperature of the terminal post base plate during battery charging and discharging.

[0007] An electrode post, comprising:

[0008] The plate portion has a flat structure and is defined by the length direction, width direction, thickness direction and a second central axis in the thickness direction. The plate portion has a first end face and a second end face opposite each other in the thickness direction, wherein the plate portion is centrally symmetrical about the second central axis.

[0009] The columnar portion has a columnar structure and extends along the thickness direction in a local area of ​​the first end face. The columnar portion has a first central axis parallel to the second central axis and is centrally symmetrical about the first central axis.

[0010] In one embodiment, the cross-section of the column portion perpendicular to the first central axis has a racetrack-shaped structure or a circular structure.

[0011] In one embodiment, a first plane is defined based on a first central axis and a second central axis; both the plate portion and the column portion are arranged symmetrically with respect to the first plane.

[0012] On the other hand, this application also provides a cell cover plate, comprising:

[0013] The cover plate body has mounting holes;

[0014] As described above, the pole has a column portion that penetrates the mounting hole, and the plate portion and the cover plate body have the same length direction, width direction and thickness direction, and the plate portion is located on one side of the cover plate body in the thickness direction.

[0015] The rivet block is riveted to the column part on the other side of the thickness direction of the cover plate body;

[0016] The second plastic part extends around the column portion and on the surface of the cover plate body near the plate portion, and the second plastic part is at least partially located between the cover plate body and the plate portion;

[0017] A first plastic part is arranged around the column portion and extending on the surface of the cover plate body near the rivet block, and the first plastic part is at least partially located between the cover plate body and the rivet block.

[0018] A sealing ring is arranged around the column portion and at least partially between the cover plate body and the column portion in annular gap.

[0019] In one embodiment, a groove is arranged on the side of the second plastic near the plate body, and the plate body is embedded in the groove.

[0020] In one embodiment, the distance from the first central axis to the end face on one side of the plate portion along its length is h1 mm;

[0021] The distance from the first central axis to the end face on the other side of the length direction of the plate body is h2 mm, and h1>h2;

[0022] The distance A mm between the first central axis and one end face of the cover plate body along its length direction;

[0023] The distance B mm between the first central axis and the end face on the other side of the length direction of the cover plate body, where A>B;

[0024] in,

[0025] 0.9≤(A / (A+B)) / (h1 / (h1+h2))≤1.1.

[0026] On the other hand, this application also provides a battery, comprising:

[0027] The battery casing has a receiving cavity and an open opening;

[0028] The cell electrode assembly is placed within the receiving cavity; and

[0029] As described above, a cell cover is arranged at the opening to close the battery casing; wherein the terminals are electrically connected to the cell electrode assembly.

[0030] In one embodiment, the plate portion of the electrode post is electrically connected to the tab of the battery cell electrode assembly.

[0031] In one embodiment, the battery housing has two openings located at opposite ends of the battery housing.

[0032] On the other hand, this application also provides an electrical device including the battery described above.

[0033] The aforementioned terminals, cell covers, batteries, and electrical equipment have their first central axis parallel to the second central axis of the plate. The offset design of the terminals is determined by the constraint relationship 0.9 ≤ (A / (A+B)) / (h1 / (h1+h2)) ≤1.1, which ensures uniform current distribution, avoids local overcurrent and temperature rise, and significantly improves the thermal safety performance of the battery. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of the pole in one embodiment of the present application.

[0035] Figure 2 for Figure 1 A top view of the pole in the diagram.

[0036] Figure 3 for Figure 2 Sectional view along direction AA.

[0037] Figure 4 This is an exploded view of the battery cell cover assembly in one embodiment of this application.

[0038] Figure 5 This is a top view of the battery cell cover in one embodiment of the present application in its assembled state.

[0039] Figure 6 for Figure 5 BB-direction sectional view.

[0040] Figure 7 This is a schematic diagram of the internal connection structure of the battery pack in one embodiment of this application.

[0041] Figure 8 This is a top view of the pole structure in another embodiment of this application.

[0042] Figure 9 for Figure 8 CC-direction sectional view.

[0043] Among them: 100, pole post; 200, cover plate body; 300, first plastic part; 400, second plastic part; 500, riveting block; 600, sealing ring; 700, battery cell electrode assembly; 800, electrode tab;

[0044] 110. Columnar section; 120. Plate section;

[0045] X1, First central axis; X2, Second central axis;

[0046] S1, First end face; S2, Second end face;

[0047] Y1, the first plane. Detailed Implementation

[0048] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0049] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms 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 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 of this application.

[0050] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0052] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0054] Please see Figures 1 to 3 The diagram shows a schematic representation of the pole structure in this application.

[0055] In some embodiments, the pole post 100 includes an integrally formed plate portion 120 and a post portion 110;

[0056] The plate portion 120 is flat, and the length direction, width direction, thickness direction and second central axis X2 in the thickness direction are defined based on the structure of the plate portion 120 itself.

[0057] Please continue to refer to the following: Figure 3 The plate portion 120 has a first end face S1 and a second end face S2 that are opposite each other in the thickness direction and are centrally symmetrical about a second central axis X2; the column portion 110 is columnar and extends from a local area of ​​the first end face S1 along the thickness direction T. The column portion 110 has a first central axis X1 that is parallel to the second central axis X2.

[0058] Furthermore, based on the first central axis X1 and the second central axis X2, a first plane Y1 is defined, and both the plate portion 120 and the column portion 110 are arranged symmetrically with respect to the first plane Y1.

[0059] See Figures 2-3 In one specific embodiment, the cross section of the column portion 110 perpendicular to the first central axis X1 is a racetrack-shaped structure.

[0060] See Figures 8-9 In another specific embodiment, the cross-section of the column portion 110 perpendicular to the first central axis X1 is a circular structure.

[0061] See Figures 4-6 This application also provides a cell cover plate, comprising:

[0062] The cover plate body 200 has mounting holes, and the length, width, and thickness directions of the cover plate body 200 are consistent with those of the plate body 120.

[0063] The pole post 100 has a column body 110 that passes through the mounting hole, and the plate body 120 is located on one side of the cover plate body 200 in the thickness direction.

[0064] The rivet block 500 is riveted and fixed to the column part 110 on the other side of the thickness direction of the cover plate body 200.

[0065] The second plastic part 400 extends around the column portion 110 and extends on the surface of the cover body 200 near the plate portion 120, and the second plastic part 400 is at least partially located between the cover body 200 and the plate portion 120.

[0066] A first plastic part 300 extends around the column portion 110 and extends on the surface of the cover body 200 near the rivet block 500, and the first plastic part 300 is at least partially located between the cover body 200 and the rivet block 500.

[0067] A sealing ring 600 is arranged around the column portion 110 and at least partially between the cover plate body 200 and the column portion 110 in the annular gap.

[0068] Further, please refer to Figure 6 The second plastic part 400 has a groove on the side near the plate part 120, and the plate part 120 is embedded in the groove to enhance structural stability.

[0069] In some embodiments, the following parameters are defined:

[0070] The distance from the first central axis X1 to one end face of the plate part 120 along the length direction is h1 (mm), and the distance to the other end face is h2 (mm), and h1 > h2;

[0071] The distance from the first central axis X1 to one end face of the cover plate body 200 along its length is A (mm), and the distance from the first central axis X1 to the other end face of the cover plate body 200 along its length is B (mm), and A > B; the above distances h1, h2, A, and B together satisfy the following relationship: 0.9 ≤ (A / (A+B)) / (h1 / (h1+h2)) ≤ 1.1

[0072] The above constraint relationship ensures that the current is evenly distributed on both sides of the plate 120, avoiding local overcurrent.

[0073] Example 1:

[0074] In this embodiment, the total length (A+B) of the cover plate body 200 is defined as 120mm, and the total length (h1+h2) of the plate portion 120 is defined as 32mm;

[0075] The distance A from the first central axis X1 to one end face of the cover plate body 200 along the length direction is 70mm.

[0076] The distance B from the first central axis X1 to the other end face of the cover plate body 200 along the length direction is 50mm;

[0077] In this embodiment, by adjusting the value of the distance h1 from the first central axis X1 to one end face of the plate part 120 in the length direction, the highest temperature of the electrode post is measured under the same charging conditions (the highest temperature of the electrode post shall not exceed 55°C).

[0078] The experimental data are shown in Table 1, where the value θ = (A / (A+B)) / (h1 / (h1+h2)).

[0079] Table 1

[0080]

[0081] Example 2:

[0082] In this embodiment, the total length (A+B) of the cover plate body 200 is defined as 110mm, and the total length (h1+h2) of the plate body 120 is defined as 30mm;

[0083] The distance A from the first central axis X1 to one end face of the cover plate body 200 along its length is 65mm.

[0084] The distance B from the first central axis X1 to the other end face of the cover plate body 200 along the length direction is 45mm;

[0085] In this embodiment, by adjusting the value of the distance h1 from the first central axis X1 to one end face of the plate part 120 in the length direction, the highest temperature of the electrode post is measured under the same charging conditions (the highest temperature of the electrode post shall not exceed 55°C).

[0086] The experimental data are shown in Table 2, where the value θ = (A / (A+B)) / (h1 / (h1+h2)).

[0087] Table 2

[0088]

[0089] Example 3:

[0090] In this embodiment, the total length (A+B) of the cover plate body 200 is defined as 105mm, and the total length (h1+h2) of the plate body 120 is defined as 30mm;

[0091] The distance A from the first central axis X1 to one end face of the cover plate body 200 along the length direction is 60mm.

[0092] The distance B from the first central axis X1 to the other end face of the cover plate body 200 along the length direction is 45mm;

[0093] In this embodiment, by adjusting the value of the distance h1 from the first central axis X1 to one end face of the plate part 120 in the length direction, the highest temperature of the electrode post is measured under the same charging conditions (the highest temperature of the electrode post shall not exceed 55°C).

[0094] The experimental data are shown in Table 3, where the value θ = (A / (A+B)) / (h1 / (h1+h2)).

[0095] Table 3

[0096]

[0097] In summary, the experimental data from each embodiment show that when the relationship 0.9≤(A / (A+B)) / (h1 / (h1+h2))≤1.1 is satisfied, the maximum temperature of the pole 100 can meet the usage requirements.

[0098] Please continue reading. Figure 7 In other embodiments, this application also provides a battery, comprising:

[0099] The battery casing has a receiving cavity and two open openings at opposite ends;

[0100] The cell electrode assembly 700 is placed in the receiving cavity and is electrically connected to the plate body 120 by welding the electrode tabs 800.

[0101] The cell cover plate closes one end opening of the battery casing through the cover plate body 200, and leads the electrode outward through the column part 110 of the electrode post 100.

[0102] In other embodiments, this application also provides an electrical device including the above-mentioned battery, which significantly reduces the risk of local temperature rise and improves device safety through the eccentric structure of the terminal post 100.

[0103] This application defines the first central axis X1 of the column portion 110 as parallel to the second central axis X2 of the plate portion 120, and constrains the layout position of the plate portion 120 in the battery by combining the common relationship of distances h1, h2, A and B, so that the current on both sides of the plate portion 120 is uniform and abnormal temperature rise caused by local overcurrent can be avoided.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A pole, characterized in that Comprising: a plate body portion in a flat structure, defining a length direction, a width direction, a thickness direction and a second central axis in the thickness direction based on the plate body portion, the plate body portion having a first end face and a second end face opposite in the thickness direction, the plate body portion being centrosymmetric about the second central axis; a column body portion in a columnar structure, the column body portion extending in the thickness direction at a local area of the first end face; wherein the column body portion has a first central axis parallel to the second central axis, the column body portion being centrosymmetric about the first central axis; and when the pole column is arranged on the cell cover plate, a distance from the first central axis to an end face of one side of the plate body portion in the length direction is h1; a distance from the first central axis to an end face of the other side of the plate body portion in the length direction is h2, and h1>h2; a distance from the first central axis to an end face of one side of the cover plate body in the length direction is A; a distance from the first central axis to an end face of the other side of the cover plate body in the length direction is B, and A>B; wherein 0.9≤(A / (A+B)) / (h1 / (h1+h2))≤1.1, by matching the global eccentricity of the column body portion on the cover plate body with the local eccentricity on the plate body portion, the current is ensured to be uniformly distributed on both sides of the plate body portion.

2. The pole according to claim 1, characterized in that A cross section of the column body portion perpendicular to the first central axis is in a runway type structure or a circular structure.

3. The pole according to claim 1 or 2, characterized in that A first plane is defined based on the first central axis and the second central axis; the plate body portion and the column body portion are symmetrically arranged relative to the first plane.

4. An electrode cover plate, characterized by, Comprising: a cover plate body having a mounting hole; the pole column of any one of claims 1-3, wherein the column body portion penetrates through the mounting hole, the plate body portion and the cover plate body have consistent length direction, width direction and thickness direction, and the plate body portion is located on one side of the cover plate body in the thickness direction; a riveting block riveted with the column body portion on the other side of the cover plate body in the thickness direction; a second plastic member arranged around the column body portion and extending on a surface of the cover plate body close to the plate body portion, and the second plastic member is at least partially interposed between the cover plate body and the plate body portion; a first plastic member arranged around the column body portion and extending on a surface of the cover plate body close to the riveting block, and the first plastic member is at least partially interposed between the cover plate body and the riveting block; a sealing ring arranged around the column body portion and at least partially arranged between the cover plate body and the annular gap of the column body portion.

5. The cell cover plate of claim 4, wherein, A sink groove is arranged on one side of the second plastic member close to the plate body portion, and the plate body portion is embedded in the sink groove.

6. A battery, characterized by Comprising: a battery shell having a receiving cavity and an open opening; a cell pole group arranged in the receiving cavity; and the cell cover plate of any one of claims 4-5 is arranged in the opening to close the battery shell; wherein the pole column is electrically connected with the cell pole group. The plate body portion of the pole column is electrically connected with the tab of the cell pole group.

7. The battery of claim 6, wherein, The battery shell has two openings at opposite ends of the battery shell.

8. The battery of claim 6, wherein, The battery comprises any one of claims 6-8.

9. An electric device, characterized by ​

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