Battery cell and battery pack

Abstract

The utility model provides a battery cell and a battery pack, the battery cell comprises a shell, a first pole and a second pole, the shell comprises a top plate and a bottom plate which are oppositely arranged, the top plate comprises a first plate body part, a second plate body part and a third plate body part, and the second plate body part and the third plate body part are respectively connected to two ends of the first plate body part; the distance between the second plate body part and the bottom plate and the distance between the third plate body part and the bottom plate are smaller than the distance between the first plate body part and the bottom plate; the first pole and the second pole are respectively arranged on one of the second plate body part and the third plate body part; the first pole is convexly arranged away from the bottom plate, and the second pole is convexly arranged towards the bottom plate; one of the first pole and the second pole is a positive pole, and the other one is a negative pole. According to the battery cell provided by the embodiment of the invention, the connection of a plurality of battery cells can be realized through the structure of the battery cell, the increase of the height of the battery cell caused by the increase of external connecting pieces is avoided, the space utilization rate in the battery pack is improved, and the battery cell is also suitable for the condition of limited installation space and wider in application scene.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to an electric core and a battery pack. Background Art

[0002] With the development of new energy battery technology, various electric cores have been widely used in various fields of production and life. The application scenarios of various electric cores are also more diversified, and different application scenarios have different requirements for the structure of the electric core.

[0003] In related technologies, the positive and negative electrode posts of some electric cores are arranged on the same side. The positive and negative electrode posts of the electric cores need to be connected by electrical connectors between multiple electric cores. This connection method occupies the height space of the electric core, resulting in low space utilization rate in the battery pack. Utility Model Content

[0004] This application aims to provide an electric core and a battery pack to solve the problem that the existing electric core occupies the space of the battery pack.

[0005] To solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, this application discloses an electric core having a first direction, a second direction, and a third direction that intersect pairwise, including a housing, a first electrode post, and a second electrode post; wherein,

[0007] The housing includes a top plate and a bottom plate oppositely arranged along the first direction. The top plate includes a first plate body portion, a second plate body portion, and a third plate body portion; the second plate body portion and the third plate body portion are respectively connected to opposite ends of the first plate body portion along the second direction, and the distances from the second plate body portion and the third plate body portion to the bottom plate are both less than the distance from the first plate body portion to the bottom plate;

[0008] One of the first electrode post and the second electrode post is arranged on the second plate body portion, and the other is arranged on the third plate body portion;

[0009] The first electrode post protrudes along the first direction away from the direction where the bottom plate is located, and the second electrode post protrudes along the first direction toward the direction where the bottom plate is located;

[0010] One of the first electrode post and the second electrode post is a positive electrode post, and the other is a negative electrode post.

[0011] Optionally, along the first direction, the distance from the second plate body portion to the bottom plate is D1; the distance from the third plate body portion to the bottom plate is D2; the distance from the first plate body portion to the bottom plate is D3; satisfying: 0.9D3 ≤ D1 + D2 ≤ D3.

[0012] Optionally, along the second direction, the size of the second plate body part is W1, and the size of the third plate body part is W2, satisfying: 0.9W1 ≤ W2 ≤ 1.1W1.

[0013] Optionally, along the first direction, the first pole passes through the center of the second plate body part, and the second pole passes through the center of the third plate body part.

[0014] Optionally, a first clamping part is provided on the second plate body part, and a second clamping part adapted to the first clamping part is provided on the third plate body part;

[0015] Alternatively, a first clamping part is provided on the first pole, and a second clamping part adapted to the first clamping part is provided on the second pole.

[0016] Optionally, the housing further includes a circumferential plate, which is connected between the top plate and the bottom plate and encloses a receiving cavity with the top plate and the bottom plate;

[0017] The battery cell further includes a pole core assembly, which is disposed in the receiving cavity. First and second pole tabs are respectively provided at both ends of the pole core assembly along the second direction. One of the first pole tab and the second pole tab is electrically connected to the first pole, and the other is electrically connected to the second pole.

[0018] Optionally, the housing has an opening in the third direction, and the opening communicates with the receiving cavity;

[0019] The battery cell further includes a cover plate, which is respectively connected to the top plate, the bottom plate and the circumferential plate to seal the opening.

[0020] Optionally, the pole core assembly includes a first pole core and a second pole core stacked along the first direction;

[0021] First and second sub-pole tabs are respectively provided at opposite ends of the first pole core along the second direction;

[0022] Third and fourth sub-pole tabs are respectively provided at opposite ends of the second pole core along the second direction;

[0023] The first sub-pole tab is electrically connected to the third sub-pole tab to form the first pole tab, and the second sub-pole tab is electrically connected to the fourth sub-pole tab to form the second pole tab.

[0024] Optionally, the first sub-pole tab includes a first pole tab part and a second pole tab part connected in sequence. The first pole tab part is connected to the first pole core, and the second pole tab part extends away from the first pole core;

[0025] Along the first direction, the second pole ear part, the third sub-pole ear and the first pole column are electrically connected in sequence;

[0026] The second sub-pole ear includes a third pole ear part and a fourth pole ear part connected in sequence. The third pole ear part is connected to the first pole core, and the fourth pole ear part extends in a direction away from the first pole core;

[0027] Along the first direction, the fourth pole ear part, the fourth sub-pole ear and the second pole column are electrically connected in sequence.

[0028] In a second aspect, the present application also discloses a battery pack, including: a box body, a plurality of the above-described battery cells, and electrical connection members. The plurality of battery cells are arranged in a multi-row and multi-column array along the second direction and the third direction in the box body; wherein,

[0029] Along the second direction, among two adjacent battery cells, the second plate body part of one battery cell is connected to the third plate body part of the other battery cell in the first direction, and the first pole column of one battery cell is embedded in the second pole column of the other battery cell to realize electrical connection between adjacent battery cells and form a row of battery strings;

[0030] Two adjacent rows of the battery strings along the third direction are electrically connected through the electrical connection members.

[0031] Optionally, the electrical connection member includes a first connection part, a second connection part and a connection line. The connection line is connected between the first connection part and the second connection part, wherein,

[0032] The first connection part is connected to the pole column of the end battery cell in one row of the battery strings, and the second connection part is connected to the pole column of the end battery cell in the adjacent battery strings.

[0033] In the embodiment of the present application, the housing of the battery cell includes a top plate and a bottom plate oppositely arranged along the first direction. The second plate body part and the third plate body part of the top plate are respectively arranged at opposite ends of the first plate body part along the second direction, and the distances from the second plate body part and the third plate body part to the bottom plate are less than the distance from the first plate body part to the bottom plate. The first pole column and the second pole column are respectively arranged on one of the second plate body part and the third plate body part and have opposite protruding directions. According to the above structure, when a plurality of battery cells are arranged along the second direction, the second plate body part of one battery cell can be oppositely arranged and connected to the third plate body part of the adjacent battery cell in the first direction, and the electrical connection between adjacent battery cells is realized through the mutual embedding of the first pole column and the second pole column, avoiding the increase in the height of the battery cell caused by adding external connection members, improving the space utilization rate inside the battery pack, and also being applicable to conditions with limited installation space, and having a wider application scenario.

[0034] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of embodiments in conjunction with the following drawings, in which:

[0036] Figure 1 is a schematic structural diagram of the battery cell described in an embodiment of the present application;

[0037] Figure 2 is a top view of the battery cell described in an embodiment of the present application;

[0038] Figure 3 is a front view of the battery cell described in an embodiment of the present application;

[0039] Figure 4 is a cross-sectional view of the housing described in an embodiment of the present application;

[0040] Figure 5 is Figure 1 an enlarged schematic view of part A in;

[0041] Figure 6 is Figure 1 an enlarged schematic view of part B in;

[0042] Figure 7 is a schematic structural diagram of the cover plate described in an embodiment of the present application;

[0043] Figure 8 is a schematic structural diagram of the housing described in an embodiment of the present application;

[0044] Figure 9 is a cross-sectional view of the electrode core assembly described in an embodiment of the present application;

[0045] Figure 10 is a cross-sectional view of the first electrode core described in an embodiment of the present application;

[0046] Figure 11 is a top view of the first electrode core described in an embodiment of the present application;

[0047] Figure 12 is a cross-sectional view of the second electrode core described in an embodiment of the present application;

[0048] Figure 13 is a top view of the second electrode core described in an embodiment of the present application;

[0049] Figure 14 is a side view schematic diagram of the connection of multiple battery cells described in an embodiment of the present application;

[0050] Figure 15It is a top view schematic diagram of the connection of multiple battery cells described in the embodiments of the present application;

[0051] Figure 16 It is a schematic structural diagram of the connector described in the embodiments of the present application;

[0052] Figure 17 It is a schematic structural diagram of the connector from another angle described in the embodiments of the present application;

[0053] Figure 18 It is a schematic structural diagram of the battery cell module described in the embodiments of the present application;

[0054] Figure 19 is Figure 18 The enlarged schematic diagram of part C in

[0055] Reference numerals: 10 - housing, 101 - first pole, 102 - second pole, 103 - accommodation cavity, 11 - top plate, 111 - first plate part, 112 - second plate part, 113 - third plate part, 1131 - recessed space, 114 - connecting plate, 12 - bottom plate, 13 - circumferential plate, 14 - first clamping part, 15 - second clamping part, 20 - cover plate, 30 - pole core assembly, 301 - first pole tab, 302 - second pole tab, 31 - first pole core, 311 - first sub - pole tab, 3111 - first pole tab part, 3112 - second pole tab part, 312 - second sub - pole tab, 3121 - third pole tab part, 3122 - fourth pole tab part, 32 - second pole core, 321 - third sub - pole tab, 322 - fourth sub - pole tab, 40 - electrical connector, 41 - first connecting part, 42 - second connecting part, 43 - connecting wire, x - first direction, y - second direction, z - third direction. Detailed Description of the Embodiment

[0056] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0057] The terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the associated objects before and after.

[0058] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0059] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0060] The embodiment of the present application provides an electric core. According to the electric core provided by the embodiment of the present application, the external connecting piece during the connection of adjacent electric cores can be omitted, and at the same time, the height space of the electric core module or battery pack can be saved.

[0061] The following further describes in detail the electric core provided by the embodiment of the present application in conjunction with the drawings and specific embodiments:

[0062] It should be noted that the electric core in the embodiment of the present application has a first direction x, a second direction y, and a third direction z that intersect pairwise. Preferably, the first direction x, the second direction y, and the third direction z are pairwise perpendicular, where the perpendicularity includes a reasonable angular range with a certain floating with respect to 90°, and can achieve the technical effects required by the present application, such as 90° ± 10°.

[0063] As Figures 1 to 6 shown, the electric core disclosed in the present application specifically may include: a housing 10, a first pole 101, a second pole 102, and a cover plate 20.

[0064] Specifically, the housing 10 includes a top plate 11, a bottom plate 12 oppositely arranged along the first direction x, and a circumferential plate 13 disposed between the top plate 11 and the bottom plate 12. Among them, the top plate 11 includes a first plate portion 111, a second plate portion 112, and a third plate portion 113. The second plate portion 112 and the third plate portion 113 are respectively connected to opposite ends of the first plate portion 111 along the second direction y, and the distances from the second plate portion 112 and the third plate portion 113 to the bottom plate 12 are both smaller than the distance from the first plate portion 111 to the bottom plate 12. It should be noted that in the embodiments of the present application, the top plate 11 and the bottom plate 12 are only used as an example of a component name, and they do not limit the placement direction of the housing 10. For example Figure 14 in the case of connecting multiple battery cells as shown, the top plate of the leftmost battery cell faces upward, the placement direction of the second battery cell is opposite to that of the first battery cell, and at this time the bottom plate 12 faces upward. In addition, the present application does not specifically limit the dimensions of the first plate portion 111, the second plate portion 112, and the third plate portion 113 along the second direction y and the third direction z. Preferably, along the second direction y, the dimension of the first plate portion 111 is greater than the dimensions of the second plate portion 112 and the third plate portion 113, and along the third direction z, the dimensions of the first plate portion 111, the second plate portion 112, and the third plate portion 113 are equal.

[0065] One of the first pole 101 and the second pole 102 is disposed on the second plate portion 112, and the other is disposed on the third plate portion 113. The first pole 101 protrudes along the first direction x in a direction away from the bottom plate 12, and the second pole 102 protrudes along the first direction x in a direction towards the bottom plate 12; one of the first pole 101 and the second pole 102 is a positive pole, and the other is a negative pole.

[0066] Specifically, in the embodiment of the present application, the first pole 101 is a negative pole arranged on the second plate body 112, and protrudes from the second plate body 112 in a direction away from the bottom plate 12, and the second pole 102 is a positive pole arranged on the third plate body 113, and protrudes in a direction close to the bottom plate 12. It should be noted that the third plate body 113 includes a first surface and a second surface that are opposite to each other along the first direction x, wherein the first surface is opposite to the bottom plate 12. When the thickness of the third plate body 113 is relatively large, the distance from the surface of the second pole 102 facing away from the bottom plate 12 to the second surface is smaller than the distance between the first surface and the second surface, so as to form a recessed portion for the first pole 101 of another battery cell to be plugged in; when the thickness of the third plate body 113 is relatively small, a recessed portion is formed at the end of the second pole 102 facing away from the bottom plate 12, so as to allow the first pole 101 of another battery cell to be plugged in, and the second pole 102 also protrudes from the first surface toward the bottom plate 12. The present application does not make specific limitations on this, but it can be understood that, regardless of any of the above situations, from the outside of the shell 10, the second pole 102 is recessed on the third plate body 113 and forms a recessed space 1131.

[0067] According to the battery cell provided in the embodiment of the present application, when multiple battery cells are arranged along the second direction y, among two adjacent battery cells, the second plate body 112 of one battery cell and the third plate body 113 of the other battery cell can be interlocked through the first pole 101 protruding from the second plate body 112 and the second pole 102 recessed in the third plate body 113 to achieve mechanical and electrical connection between the two battery cells.

[0068] It can be understood that when multiple battery cells are connected by interlocking, adjacent battery cells are interlocked through the second plate body 112 and the third plate body 113, which not only eliminates the connector structure between adjacent battery cells and helps to simplify the structure of the battery module, but also helps to reduce the height of the battery module by eliminating the height of the connector, thereby providing convenience for the layout of the battery pack.

[0069] In addition, under the structure of this battery cell, the protruding direction of the pole intersects with the line connecting the two poles, and the protruding pole part can serve as an additional support point between the two battery cells arranged along the second direction y; and the second plate body 112 and the third plate body 113 of two adjacent battery cells are in a stacked state along the first direction x, and the battery cell on the upper layer can exert a certain compression effect on the battery cell on the lower layer under the action of gravity, thereby enhancing the tightness of the connection between the two battery cells, reducing the risk of looseness between the battery cells caused by shaking of the battery pack, and ensuring the stability and reliability of the connection between multiple battery cells.

[0070] In the embodiment of the present application, the distance from the second plate body part 112 to the bottom plate 12 is D1, the distance from the third plate body part 113 to the bottom plate 12 is D2, and the distance from the first plate body part 111 to the bottom plate 12 is D3. It can be understood that when multiple battery cells provided in the embodiment of the present application are connected in sequence along the second direction y, since the second plate body parts 112 and the third plate body parts 113 of two adjacent battery cells are in a stacked state along the first direction x, therefore, by reasonably setting the relationship between D1, D2, and D3, it can be ensured that when the first pole column 101 and the second pole column 102 of multiple battery cells connected in sequence along the second direction y cooperate, they can be well connected, meeting the purpose of electrically connecting the positive and negative electrodes of the battery cells; at the same time, the heights of multiple battery cells in the first direction x after connection are more uniform, and there will be no large fluctuations in height, the overall surface is flatter, reducing the waste of the internal space of the battery pack due to uneven dimensions, and making more uniform contact with the battery pack box body, reducing the movement of the battery module in the battery pack box due to uneven shape.

[0071] In some embodiments, the distance D1 from the second plate body part 112 to the bottom plate 12, the distance D2 from the third plate body part 113 to the bottom plate 12, and the distance D3 from the first plate body part 111 to the bottom plate 12 may satisfy the following conditions: 0.9D3 ≤ D1 + D2 ≤ D3. Preferably, D1 + D2 = D3.

[0072] As shown in the following table, a batch of battery cells are produced, with W1 = 15 mm and W2 = 15 mm for each battery cell. The D1, D2, and D3 of each battery cell are controlled at different design values, and the defective rate of the vibration test measured after the qualified battery cells are assembled into a module and finally passed the vibration test is detected.

[0073]

[0074]

[0075] As shown in the vibration test failure rate results in the above table, in Examples 1 to 7, the distance D1 from the second plate body portion 112 to the bottom plate 12, the distance D2 from the third plate body portion 113 to the bottom plate 12, and the distance D3 from the first plate body portion 111 to the bottom plate 12 satisfy 0.9D3 ≤ D1 + D2 ≤ D3. At this time, the vibration test failure rate of the battery pack varies between 0.1% and 2%, and the failure rate is relatively low. And when D1 + D2 = D3, the vibration test failure rate is the lowest, which is 0.1%. In Comparative Examples 1 to 4, the distance D1 from the second plate body portion 112 to the bottom plate 12, the distance D2 from the third plate body portion 113 to the bottom plate 12, and the distance D3 from the first plate body portion 111 to the bottom plate 12 do not satisfy the relationship of 0.9D3 ≤ D1 + D2 ≤ D3. At this time, after the battery cells are assembled into modules and undergo vibration tests, a large proportion of failures occur, which does not meet the excellent rate requirements for the design of the battery cells. Among them, the above vibration test is carried out according to the test method in "Lithium-ion Batteries for Electric Energy Storage" (GB / T 36276 - 2023).

[0076] Further, in the embodiments of the present application, along the second direction y, the size of the second plate body portion 112 is W1, and the size of the third plate body portion 113 is W2, satisfying: 0.9W1 ≤ W2 ≤ 1.1W1. Preferably, W1 = W2.

[0077] It should be noted that according to the above design, when the battery cells are combined in series, when the first pole column 101 of one battery cell cooperates with the second pole column 102 of another battery cell, within a reasonable tolerance range, the distance between the battery cells after series connection maintains reasonable strength, improving the strength of the module in the second direction y, and the module assembly success rate is high. If not designed according to this size, the module assembly is difficult or impossible to complete. In addition, with such a setting, the specifications between the second plate body portion 112 and the third plate body portion 113 are similar, which is also convenient for production and processing, and is beneficial to improving production efficiency. Preferably, the sizes of the second plate body portion 112 and the third plate body portion 113 along the second direction y are equal.

[0078] As shown in the following table, a batch of battery cells are produced, with D1 = 20mm, D2 = 20mm, and D3 = 40mm for each battery cell. The W1 and W2 of each battery cell are controlled at different design values, and the qualified battery cells are assembled into module assemblies, and the module assembly failure rate during the assembly process is observed. It should be noted that in the embodiments of the present application, the assembly failure rate means that when the positive electrode of one battery cell is docked and installed with the negative electrode of another battery cell, if interference occurs and it cannot be installed, it is defined as a failure.

[0079] W1 / mm W2 / mm Relationship between W2 and W1 Module assembly failure rate Example 1 15 15 W2 = W1 0.1％ Example 2 15 16 W2 = 1.067W1 1％ Example 3 16 15 W2 = 0.9375W1 1％ Example 4 19 20 W2 = 1.05W1 0.8％ Example 5 20 19 W2 = 0.95W 0.8％ Example 6 30 29 W2 = 0.967W1 0.5％ Example 7 29 30 W2 = 1.034W1 0.5％ Example 8 29.5 30 W2 = 1.017W1 0.3％ Comparative Example 1 12 15 W2 = 1.25W1 30％ Comparative Example 2 15 12 W2 = 0.8W1 30％ Comparative Example 3 20 25 W2 = 1.25W1 30％ Comparative Example 4 25 20 W2 = 0.8W1 30％

[0080] As shown in the results of the module assembly failure rate in the above table, in Examples 1 to 8, the size W1 of the second plate portion 112 and the size W2 of the third plate portion 113 satisfy 0.9W1 ≤ W2 ≤ 1.1W1. At this time, the module assembly failure rate is less than 1%, and the module assembly failure rate is relatively low. When W1 = W2, the module assembly failure rate is the lowest, which is 0.1%. In Comparative Examples 1 to 4, the relationship between the size W1 of the second plate portion 112 and the size W2 of the third plate portion 113 does not satisfy 0.9W1 ≤ W2 ≤ 1.1W1. At this time, a large proportion of assembly failures occur during the module assembly process of the battery cells, which does not meet the requirements of the excellent module assembly rate for the design of the battery cells.

[0081] It should be noted that in some embodiments, along the first direction x, the second direction y, and the third direction z, the dimensions of the battery cells are in millimeters (mm). Correspondingly, the distance D1 from the second plate portion 112 to the bottom plate 12, the distance D2 from the third plate portion 113 to the bottom plate 12, the distance D3 from the first plate portion 111 to the bottom plate 12, and along the second direction y, the size W1 of the second plate portion 112 and the size W2 of the third plate portion 113, the units of the above parameters are also millimeters (mm). In some other embodiments, the size units of the above parameters can also be centimeters (cm), meters (m), etc., and the present application does not make specific limitations on this.

[0082] Optionally, the first pole 101 passes through the center of the second plate portion 112 along the first direction x, and the second pole 102 passes through the center of the third plate portion 113 along the first direction x.

[0083] Specifically, in the embodiments of the present application, both the second plate portion 112 and the third plate portion 113 are rectangular, and their dimensions along the second direction y and the third direction z are the same. The projections of the first pole 101 and the second pole 102 on the second plate portion 112 and the third plate portion 113 are both circular, and the centers of the first pole 101 and the second pole 102 are respectively set at the geometric center positions of the second plate portion 112 and the third plate portion 113. It can be understood that in this case, since the first pole 101 and the second pole 102 are mutually embedded, the connection strength around the first pole 101 and the second pole 102 is more uniform, and the positioning is more convenient and accurate when adjacent battery cells are assembled.

[0084] In some embodiments, the surface of the first pole 101 facing away from the bottom plate 12 has a first center point, and the surface of the second pole 102 facing away from the bottom plate 12 has a second center point. The connection line between the first center point and the second center point is symmetrically arranged with respect to the midpoint of the connection line. In this way, the first pole 101 does not need to pass through the center of the second plate portion 112, and the second pole 102 does not need to pass through the center of the third plate portion 113 either, and the assembly connection between two adjacent battery cells can also be realized.

[0085] Optionally, the battery cell further includes a first clamping portion 14 and a second clamping portion 15 adapted to the first clamping portion 14. Two adjacent battery cells along the first direction x can be clamped and connected through the first clamping portion 14 and the second clamping portion 15 of the adjacent battery cell.

[0086] It should be noted that the first clamping portion 14 and the second clamping portion 15 being adapted means that the first clamping portion 14 and the second clamping portion 15 can be clamped and connected to each other. When two battery cells are connected, the first clamping portion 14 of one battery cell can be clamped and connected to the second clamping portion 15 of the other battery cell to realize the connection between the two battery cells.

[0087] In one embodiment, the first clamping portion 14 is provided on the second plate body portion 112, and the second clamping portion 15 is provided on the third plate body portion 113. Exemplarily, the first clamping portion 14 is provided on the second plate body portion 112, and the second clamping portion 15 is provided on the third plate body portion 113. In practical applications, when the above battery cells are grouped, the second plate body portion 112 and the third plate body portion 113 of adjacent battery cells are arranged opposite to each other along the first direction x. When adjacent battery cells are assembled, the first clamping portion 14 on the second plate body portion 112 and the second clamping portion 15 on the third plate body portion 113 can be clamped and connected. In the case where the first pole column 101 and the second pole column 102 are fitted and connected, the connection strength between adjacent battery cells is further improved, and the reliability of the battery cell module is ensured.

[0088] In another embodiment, the first clamping portion 14 is provided on the first pole column 101, and the second clamping portion 15 is provided on the third plate body portion 113. Among them, the first clamping portion 14 is a buckle, and the second clamping portion 15 is a slot. The buckle is connected to the first pole column 101, and the slot is provided on the third plate body portion 113. As Figure 6 shown, the first pole column 101 protrudes from the second plate body portion 112. The buckle is connected to the side of the first pole column 101 away from the second plate body portion 112 and is arranged parallel to the second plate body portion 112. There is a certain interval between the buckle and the second plate body portion 112 in the first direction x. As Figure 5 shown, the second pole column 102 protrudes toward the bottom plate 12 along the first direction x and forms a recessed space 1131 in the third plate body portion 113. The slot is provided on the side of the third plate body portion 113 facing away from the bottom plate 12 and is communicated with the recessed space 1131. Therefore, when connecting adjacent battery cells, the buckle connected to the first pole column 101 can be clamped in the slot to ensure the connection effect between the second plate body portion 112 and the third plate body portion 113.

[0089] It should be noted that when a plurality of the above-mentioned battery cells provided by the embodiments of the present application are connected to form a battery module, two adjacent battery cells along the first direction x need to be electrically connected by the mutual embedding of the first pole column 101 and the second pole column 102. When the first clamping portion 14 is provided on the first pole column 101, the second clamping portion 15 on the third plate body portion 113 is also located near the second pole column 102. In this way, during the process of the first pole column 101 being embedded into the second pole column 102, the clamping connection between the first clamping portion 14 and the second clamping portion 15 is completed simultaneously, and the connection between the first pole column 101 and the second pole column 102 is tighter, improving the connection effect between the first pole column 101 and the second pole column 102.

[0090] In practical applications, the buckle and the first pole column 101 can be of an integrally formed structure, and the slot and the second pole column 102 can be of an integrally formed structure. It can be understood that when the buckle and the first pole column 101 and the slot and the second pole column 102 are respectively of an integrally formed structure, compared with connection methods such as welding connection or bonding, the interfaces in the structure can be reduced, the structural integrity can be improved, and the clamping strength can be ensured.

[0091] Optionally, as Figure 8 shown, the circumferential plate 13 is connected between the top plate 11 and the bottom plate 12, and encloses a receiving cavity 103 with the top plate 11 and the bottom plate 12.

[0092] Specifically, the top plate 11 includes a first plate body portion 111, a second plate body portion 112, a third plate body portion 113, a connecting plate 114 connected between the first plate body portion 111 and the second plate body portion 112, and a connecting plate 114 connected between the first plate body portion 111 and the third plate body portion 113; the circumferential plate 13 includes side plates connected to both sides of the bottom plate 12 along the second direction y, and a back plate connecting the top plate 11, the bottom plate 12 and the two side plates. The above top plate 11, circumferential plate 13 and bottom plate 12 enclose a receiving cavity 103 with an opening. The opening is opened in the third direction z to communicate with the receiving cavity 103, as Figure 7 shown, the cover plate 20 is respectively connected to the top plate 11, the bottom plate 12 and the circumferential plate 13 to block the receiving cavity 103 and seal the opening.

[0093] In addition, the battery cell further includes a core component 30. The core component 30 is disposed in the receiving cavity 103. First pole tabs 301 and second pole tabs 302 are respectively disposed at both ends of the core component 30 along the second direction y. One of the first pole tab 301 and the second pole tab 302 is electrically connected to the first pole column 101, and the other is electrically connected to the second pole column 102.

[0094] It should be noted that, compared with traditional square battery cells, the housing 10 provided in the embodiments of the present application has an irregular shape. Since the electrode core assembly 30 is disposed in the accommodation cavity 103, the opening of the housing 10 is arranged on the side, which facilitates the assembly of the electrode core assembly 30 and the housing 10. In practical applications, the first electrode tab 301 and the second electrode tab 302 of the electrode core assembly 30 are respectively welded to one of the first electrode post 101 and the second electrode post 102, and the cover plate 20 is welded to the housing 10.

[0095] Optionally, as Figures 9 to 13 shown, the electrode core assembly 30 includes a first electrode core 31 and a second electrode core 32 stacked along the first direction x; the opposite ends of the first electrode core 31 along the second direction y are respectively provided with a first sub-electrode tab 311 and a second sub-electrode tab 312; the opposite ends of the second electrode core 32 along the second direction y are respectively provided with a third sub-electrode tab 321 and a fourth sub-electrode tab 322; the first sub-electrode tab 311 is electrically connected to the third sub-electrode tab 321 to form the first electrode tab 301, and the second sub-electrode tab 312 is electrically connected to the fourth sub-electrode tab 322 to form the second electrode tab 302.

[0096] Further, the first sub-electrode tab 311 is welded to the third sub-electrode tab 321 to form the first electrode tab 301, the second sub-electrode tab 312 is welded to the fourth sub-electrode tab 322 to form the second electrode tab 302, the first electrode tab 301 is electrically connected to the first electrode post 101, and the second electrode tab 302 is electrically connected to the second electrode post 102 to achieve the conduction of the circuit. In practical applications, the connection method by welding between the first sub-electrode tab 311 and the third sub-electrode tab 321, and between the second sub-electrode tab 312 and the fourth sub-electrode tab 322 can ensure the connection strength between the first battery cell and the second battery cell, thereby ensuring the reliability of the battery cell.

[0097] It should be noted that, in order to adapt to the structure of the housing 10 and not waste the space in the accommodation cavity 103 of the housing 10, the electrode core assembly 30 should be designed as an irregular structure adapted to the housing 10. According to the above structure form of the electrode core assembly 30, the first electrode core 31 and the second electrode core 32 can be processed separately, so that the production difficulty of such an irregular-shaped electrode core assembly 30 is reduced. Then, the first electrode core 31 is stacked on top of the second electrode core 32, and the first sub-electrode tab 311 and the second sub-electrode tab 312 on the first electrode core 31 are respectively connected to the third sub-electrode tab 321 and the fourth sub-electrode tab 322 on the second electrode core 32 to realize the transmission of electric energy between the first electrode core 31 and the second electrode core 32, and the battery cell capacity is superimposed.

[0098] In practical applications, both the first electrode core 31 and the second electrode core 32 can be processed by winding or laminating processes, and the present application does not make specific limitations in this regard. Among them, the first sub-tab 311 and the second sub-tab 312 of the first electrode core 31 can be components independent of the first electrode core 31 and then connected to the current collector. The second electrode core 32 can be a full-tab electrode core. The third sub-tab 321 and the fourth sub-tab 322 of the second electrode core 32 can be formed in the following two ways. One is formed by leaving blanks on both sides of the current collector of the second electrode core 32 along the first direction x when coating the active layer, and the other is formed by removing the active layer at the positions of the tabs on both sides after the current collector of the second electrode core 32 is coated with the active layer as a whole. The first sub-tab 311 and the second sub-tab 312 can be welded to the third sub-tab 321 and the fourth sub-tab 322 respectively.

[0099] Optionally, the first sub-tab 311 includes a first tab part 3111 and a second tab part 3112 connected in sequence. The first tab part 3111 is connected to the first electrode core 31, and the second tab part 3112 extends in a direction away from the first electrode core 31. Along the first direction x, the second tab part 3112, the third sub-tab 321, and the first pole 101 are electrically connected in sequence. The second sub-tab 312 includes a third tab part 3121 and a fourth tab part 3122 connected in sequence. The third tab part 3121 is connected to the first electrode core 31, and the fourth tab part 3122 extends in a direction away from the first electrode core 31. Along the first direction x, the fourth tab part 3122, the fourth sub-tab 322, and the second pole 102 are electrically connected in sequence.

[0100] It can be understood that since the electrode core assembly 30 in the embodiment of the present application is an irregular shape, the first tab part 3111 and the second tab part 3112 can have different extension directions. For example, the first tab part 3111 can be attached to the side surface of the first electrode core 31, and the second tab part 3112 can be attached to the top surface of the second electrode core 32 and extend to be connected to the third sub-tab 321 of the second electrode core 32. The included angle between the first tab part 3111 and the second tab part 3112 is close to a right angle, thereby improving the flatness of the tabs on the surface of the electrode core. The structure and connection method of the second sub-tab 312 and the fourth sub-tab 322 are similar to those of the first sub-tab 311 and the third sub-tab 321, and will not be elaborated here. In practical applications, the included angle between the first tab part 3111 and the second tab part 3112 can also form a shape similar to an obtuse angle, and the present application does not make specific limitations in this regard.

[0101] In a second aspect, the present application also discloses a battery pack, which includes: a box body, a plurality of the above-mentioned battery cells, and an electrical connector 40, such as Figure 14 、 Figure 15 、 Figure 18 、 Figure 19As shown in the figure, multiple battery cells are arranged in a multi-row and multi-column array in the housing along the second direction y and the third direction z, and form a battery cell module. Among them, along the second direction y, in two adjacent battery cells, the second plate portion 112 of one battery cell is connected to the third plate portion 113 of the other battery cell in the first direction x, and the first pole column 101 of one battery cell is embedded in the second pole column 102 of the other battery cell to achieve electrical connection between adjacent battery cells and form a row of battery strings. Two adjacent rows of battery strings along the third direction z are electrically connected through an electrical connector 40.

[0102] In this way, multiple battery cells arranged in sequence along the second direction y can be connected through the structures of the second plate portion 112 and the third plate portion 113 of the battery cell itself, and the end portions of the outermost battery cells in two adjacent rows of battery strings are connected through the electrical connector 40. In practical applications, two adjacent rows of battery strings along the third direction z can be connected in series or in parallel through the electrical connector 40, and the placement method and connection method of the battery cells can be selected according to the power consumption requirements of the electrical equipment.

[0103] As Figure 16 , Figure 17 shown in the figure, the electrical connector 40 includes a first connection portion 41, a second connection portion 42, and a connection line 43. The connection line 43 is connected between the first connection portion 41 and the second connection portion 42. Among them, the first connection portion 41 is connected to the pole column of the end battery cell in one row of battery strings, and the second connection portion 42 is connected to the pole column of the end battery cell in the adjacent row of battery strings.

[0104] It should be noted that the first connection portion 41 and the second connection portion 42 are respectively connected to the battery cells on the same side along the second direction y at the ends of two adjacent rows of battery strings. Therefore, the structures of the first connection portion 41 and the second connection portion 42 are structures respectively adapted to the first pole column 101 or the second pole column 102 at the ends of the two rows of battery strings.

[0105] The battery pack provided by the embodiment of the present application has the same or similar advantages as the battery cells described above, which will not be elaborated here.

[0106] In summary, the battery cells disclosed in the embodiment of the present application have at least the following advantages:

[0107] In the embodiment of the present application, the housing of the battery cell includes a top plate and a bottom plate that are oppositely arranged in the first direction. The second plate portion and the third plate portion of the top plate are respectively arranged at opposite ends of the first plate portion in the second direction, and the distances from the second plate portion and the third plate portion to the bottom plate are less than the distance from the first plate portion to the bottom plate. The first pole column and the second pole column are respectively arranged on one of the second plate portion and the third plate portion and have opposite protruding directions. According to the above structure, when multiple battery cells are arranged in the second direction, the second plate portion of one battery cell can be arranged opposite to the third plate portion of the adjacent battery cell, and the electrical connection between adjacent battery cells is realized by the mutual embedding of the first pole column and the second pole column, avoiding the increase in the height of the battery cell caused by adding external connectors, improving the space utilization rate inside the battery pack, and being applicable to the condition of limited installation space, with a wider application scenario.

[0108] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell having a first direction (x), a second direction (y) and a third direction (z) intersecting each other, characterized in that: It comprises a housing (10), a first pole (101) and a second pole (102); wherein: The housing (10) comprises a top plate (11) and a bottom plate (12) which are arranged opposite to each other along the first direction (x); the top plate (11) comprises a first plate body portion (111), a second plate body portion (112) and a third plate body portion (113); the second plate body portion (112) and the third plate body portion (113) are respectively connected to opposite ends of the first plate body portion (111) along the second direction (y), and the distances from the second plate body portion (112) and the third plate body portion (113) to the bottom plate (12) are both smaller than the distance from the first plate body portion (111) to the bottom plate (12); One of the first pole (101) and the second pole (102) is arranged on the second plate body (112), and the other is arranged on the third plate body (113); The first pole (101) is protruded along the first direction (x) in a direction away from the bottom plate (12), and the second pole (102) is protruded along the first direction (x) in a direction close to the bottom plate (12); One of the first pole (101) and the second pole (102) is a positive pole, and the other is a negative pole.

2. The battery cell according to claim 1, characterized in that: Along the first direction (x), the distance between the second plate body (112) and the bottom plate (12) is D1; ​​the distance between the third plate body (113) and the bottom plate (12) is D2; the distance between the first plate body (111) and the bottom plate (12) is D3 ； Satisfies: 0.9D3≤D1+D2≤D3.

3. The battery cell according to claim 1, characterized in that: Along the second direction (y), the size of the second plate portion (112) is W1, and the size of the third plate portion (113) is W2, satisfying: 0.9W1≤W2≤1.1W1.

4. The battery cell according to claim 3, characterized in that: Along the first direction (x), the first pole (101) passes through the center of the second plate portion (112), and the second pole (102) passes through the center of the third plate portion (113).

5. The battery cell according to claim 1, characterized in that: The battery core further comprises a first clamping portion (14) and a second clamping portion (15) adapted to the first clamping portion (14); the first clamping portion (14) is arranged on the second plate portion (112), and the second clamping portion (15) is arranged on the third plate portion (113); Alternatively, the first clamping portion (14) is arranged on the first pole (101), and the second clamping portion (15) is arranged on the third plate portion (113).

6. The battery cell according to claim 1, characterized in that: The housing (10) further comprises a circumferential plate (13), wherein the circumferential plate (13) is connected between the top plate (11) and the bottom plate (12), and encloses the top plate (11) and the bottom plate (12) to form a receiving cavity (103); The battery cell further comprises a pole core assembly (30), wherein the pole core assembly (30) is arranged in the accommodating cavity (103); the pole core assembly (30) is respectively provided with a first pole ear (301) and a second pole ear (302) at two ends along the second direction (y); one of the first pole ear (301) and the second pole ear (302) is electrically connected to the first pole column (101), and the other is electrically connected to the second pole column (102).

7. The battery cell according to claim 6, characterized in that: The housing (10) is provided with an opening in the third direction (z), and the opening is in communication with the accommodating cavity (103); The battery cell further comprises a cover plate (20), wherein the cover plate (20) is respectively connected to the top plate (11), the bottom plate (12) and the circumferential plate (13) to cover the opening.

8. The battery cell according to claim 6, characterized in that: The pole core assembly (30) comprises a first pole core (31) and a second pole core (32) stacked along the first direction (x); The first pole core (31) is provided with a first sub-pole lug (311) and a second sub-pole lug (312) at two opposite ends along the second direction (y) respectively; The second pole core (32) is provided with a third sub-pole lug (321) and a fourth sub-pole lug (322) at two opposite ends along the second direction (y) respectively; The first sub-pole tab (311) is electrically connected to the third sub-pole tab (321) to form the first pole tab (301), and the second sub-pole tab (312) is electrically connected to the fourth sub-pole tab (322) to form the second pole tab (302).

9. The battery cell according to claim 8, characterized in that: The first sub-pole lug (311) comprises a first pole lug portion (3111) and a second pole lug portion (3112) which are connected in sequence, the first pole lug portion (3111) being connected to the first pole core (31), and the second pole lug portion (3112) extending in a direction away from the first pole core (31); Along the first direction (x), the second pole lug portion (3112), the third sub-pole lug (321) and the first pole column (101) are electrically connected in sequence; The second sub-pole lug (312) comprises a third pole lug portion (3121) and a fourth pole lug portion (3122) connected in sequence, the third pole lug portion (3121) is connected to the first pole core (31), and the fourth pole lug portion (3122) extends in a direction away from the first pole core (31); Along the first direction (x), the fourth pole lug portion (3122), the fourth sub-pole lug (322) and the second pole column (102) are electrically connected in sequence.

10. A battery pack, characterized in that: include: A box, a plurality of battery cells according to any one of claims 1 to 9, and an electrical connector (40), wherein the plurality of battery cells are arranged in the box in a plurality of rows and columns along the second direction (y) and the third direction (z); wherein: Along the second direction (y), of two adjacent battery cells, the second plate body (112) of one of the battery cells is connected to the third plate body (113) of the other battery cell in the first direction (x), and the first pole (101) of one of the battery cells is embedded in the second pole (102) of the other battery cell, so as to achieve electrical connection between adjacent battery cells and form a row of battery strings; Two adjacent rows of battery strings along the third direction (z) are electrically connected via the electrical connector (40).

11. The battery pack according to claim 10, characterized in that: The electrical connector (40) comprises a first connecting portion (41), a second connecting portion (42) and a connecting wire, wherein the connecting wire is connected between the first connecting portion (41) and the second connecting portion (42), wherein: The first connection portion (41) is connected to the pole of the end cell of one row of the battery string, and the second connection portion (42) is connected to the pole of the end cell of the adjacent battery string.

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