A battery pack and an electric cell group

Abstract

This application discloses a cell assembly and a battery pack. The cell assembly includes: an end plate, multiple cells, an insulating base, and an output electrode. The multiple cells are arranged between the end plates along a first direction. The output electrode is located at one end of the end plate along a second direction and is electrically connected to the cells adjacent to the end plate. The insulating base includes a support portion and an insulating portion. One end of the support portion is connected to the end plate, and the other end is connected to the end of the output electrode away from the cell. The insulating portion is located between the cell and the output electrode along the second direction, with one end connected to the support portion and the other end extending towards the cell along the first direction. The projection of the insulating portion along the second direction at least partially falls within the cell. Thus, compared with related technologies, this application eliminates the need for openings on the end plate to reduce its height. Instead, it increases the length of the insulating portion in the first direction to increase the creepage distance. This allows the end plate to have a complete end face that abuts against the cell, thereby ensuring the uniformity of the preload force on the cell and improving the stability of the cell assembly.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a cell assembly and a battery pack. Background Technology

[0002] The battery cell assembly includes multiple battery cells connected in series. An output electrode is provided at the end of the battery cell assembly to lead out the total positive or total negative electrode of the multiple battery cells for electrical connection with adjacent battery cell assemblies or external circuits. An end plate is provided at the end of the battery cell assembly to limit the movement of the multiple battery cells. In order to ensure the insulation performance between the end plate and the output electrode, an output electrode base is also provided between the end plate and the output electrode.

[0003] In related technologies, openings are typically made on the end plate to reduce its height, and the output electrode base is installed inside the opening to ensure the creepage distance between the end plate and the output electrode. However, such a structure creates gaps in the contact surface between the end plate and the battery cell, resulting in uneven stress on the battery cell. Utility Model Content

[0004] This application aims to provide a cell assembly and battery pack that can solve the problem in related technologies where openings are made on the end plate to reduce the height of the end plate and the output electrode base is installed in the opening to ensure the creepage distance between the end plate and the output electrode. However, such a structure will leave gaps in the contact surface between the end plate and the cell, resulting in uneven force on the cell.

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

[0006] In a first aspect, embodiments of this application propose a battery cell assembly, comprising: an end plate, a plurality of battery cells, an insulating base, and an output electrode. The battery cell assembly has a first direction and a second direction that are perpendicular to each other. The plurality of battery cells are arranged between the end plates along the first direction. The output electrode is disposed at one end of the end plate along the second direction and is electrically connected to the battery cells adjacent to the end plate.

[0007] The insulating base includes a support portion and an insulating portion. One end of the support portion is connected to the end plate, and the other end of the support portion is connected to the end of the output electrode away from the cell. The insulating portion is disposed between the cell and the output electrode along the second direction, and one end of the insulating portion is connected to the support portion. The other end of the insulating portion extends toward the cell along the first direction, and the projection of the insulating portion along the second direction at least partially falls within the cell.

[0008] Optionally, the minimum distance between the end plate and the output electrode along the second direction is H, and the length of the insulating part along the first direction is L, satisfying: H+L≥16mm.

[0009] Optionally, the end plate includes an abutment portion and a body portion. The abutment portion abuts against the battery cell along the first direction, the body portion is connected to the side of the abutment portion away from the battery cell, and one end of the support portion is connected to the body portion.

[0010] Optionally, the end face of the abutment portion facing the output electrode is a first end face, and the first end face is flush with the end face of the battery cell facing the output electrode.

[0011] Optionally, the thickness of the battery cell along the first direction is D, and the thickness of the abutment portion along the first direction is W, satisfying: 16mm≤LW<D / 2.

[0012] Optionally, the height of the body portion along the second direction is less than the height of the abutting portion along the second direction.

[0013] Optionally, the body portion is provided with a slot at one end facing the output pole, and the support portion is provided with a buckle, the slot and the buckle engaging in a snap-fit ​​relationship;

[0014] Alternatively, the body portion may have a buckle at one end facing the output pole, and the support portion may have a slot at one end away from the output pole, with the slot engaging with the buckle.

[0015] Optionally, the abutting portion and the body portion are integrally formed.

[0016] Optionally, the insulating portion has a groove on the side facing the output electrode, and the output electrode is at least partially disposed within the groove.

[0017] Optionally, the battery cell assembly further includes a protective element disposed on the side of the support portion away from the end plate, the protective element being connected to the support portion to cover a portion of the output electrode.

[0018] Optionally, the end plate is a die-cast integral part.

[0019] Secondly, embodiments of this application provide a battery pack comprising: a cell assembly as described in any of the preceding claims.

[0020] In an embodiment of this application, the battery cell assembly includes: an end plate, a plurality of battery cells, an insulating base, and an output electrode. The battery cell assembly has a first direction and a second direction that are perpendicular to each other. The plurality of battery cells are arranged between the end plates along the first direction. The output electrode is disposed at one end of the end plate along the second direction and is electrically connected to the battery cells adjacent to the end plate. The insulating base includes a support portion and an insulating portion. One end of the support portion is connected to the end plate, and the other end of the support portion is connected to the end of the output electrode away from the battery cell. The insulating portion is disposed between the battery cell and the output electrode along the second direction, and one end of the insulating portion is connected to the support portion. The other end of the insulating portion extends toward the battery cell along the first direction, and the projection of the insulating portion along the second direction at least partially falls within the battery cell. In this way, by extending the insulating portion of the insulating base into the cell (the projection of the insulating portion along the second direction at least partially falls within the cell), the creepage distance between the end plate and the output electrode is increased. Compared with related technologies, this application does not require setting an opening on the end plate to reduce the height of the end plate. Instead, by increasing the length of the insulating portion of the insulating base in the first direction, the creepage distance is increased. This allows the end plate to have a complete end face that abuts against the cell, thereby ensuring the uniformity of the preload force on the cell, reducing the possibility of stress concentration, and improving the stability of the cell assembly.

[0021] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the battery cell assembly according to an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the installation of the insulating base according to an embodiment of this application;

[0025] Figure 3 This is a partial exploded view of the battery cell assembly according to an embodiment of this application;

[0026] Figure 4 This is another partial exploded view of the battery cell assembly according to an embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the structure of the insulating base according to an embodiment of this application;

[0028] Figure 6 This is a structural schematic diagram of the end beam according to an embodiment of this application;

[0029] Figure 7 This is a schematic diagram of the structure of the protective component according to an embodiment of this application.

[0030] Figure label:

[0031] 1: End plate; 11: Abutting part; 111: First end face; 12: Body part; 121: Slot; 2: Battery cell; 3: Insulating base; 31: Support part; 311: Buckle; 32: Insulating part; 321: Groove; 4: Output pole; 5: Protective component; 6: Fastener; 7: Insulating cover; 8: Insulating plate; 9: Electrical connector; X: First direction; Y: Second direction; Z: Third direction. Detailed Implementation

[0032] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0034] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] Before explaining the cell packs and battery packs provided in the embodiments of this application, the application scenarios of the cell packs and battery packs provided in the embodiments of this application will be specifically described:

[0037] With the development of battery technology, high-energy-density cells are being used more and more widely due to their significant advantages such as longer battery life, smaller size, and lighter weight. However, high energy density means that battery packs need better insulation and protection.

[0038] A battery pack consists of end plates and multiple battery cells located between the end plates. Output terminals (positive and negative terminals) are typically located on the battery cells adjacent to the end plates to electrically connect the battery pack to external circuits or other battery packs. To ensure structural strength, the end plates are generally made of metal. Therefore, to ensure the insulation distance between the end plates and the output terminals, an output terminal base is usually placed between the end plates and the output terminals to meet the creepage distance requirements. It should be noted that creepage distance refers to the shortest path length along the surface of an insulating material between two conductive components. The creepage distance between the end plates and the output terminals generally refers to the shortest path length of the output terminal base along the surface between the end plates and the output terminals.

[0039] In related technologies, openings are typically made in the end plate to install the output electrode base inside the opening, thereby reducing the electrical clearance between the end plate and the output electrode. This allows for meeting the creepage distance requirements between the end plate and the output electrode without increasing the overall height of the battery pack. However, this structure creates a "gap" on the end face where the end plate and the battery cell meet. Consequently, when the battery cell expands, the end plate cannot apply preload to the battery cell at the "gap," resulting in an uneven preload on the end face where the battery cell and the end plate meet. This causes excessive local pressure, which can easily damage the battery cell casing and lead to risks such as leakage.

[0040] Therefore, this application provides a cell assembly and a battery pack. The cell assembly and battery pack provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0041] like Figure 1As shown, in some embodiments of this application, a battery cell assembly is proposed, including: an end plate 1, a plurality of battery cells 2, an insulating base 3, and an output electrode 4. The battery cell assembly has a first direction X and a second direction Y that are perpendicular to each other. The plurality of battery cells 2 are arranged between the end plates 1 along the first direction X. The output electrode 4 is disposed at one end of the end plate 1 along the second direction Y and is electrically connected to the battery cells 2 adjacent to the end plate 1. The insulating base 3 includes a support portion 31 and an insulating portion 32. One end of the support portion 31 is connected to the end plate 1, and the other end of the support portion 31 is connected to the end of the output electrode 4 away from the battery cells 2. The insulating portion 32 is disposed between the battery cells 2 and the output electrode 4 along the second direction Y, and one end of the insulating portion 32 is connected to the support portion 31. The other end of the insulating portion 32 extends toward the battery cells 2 along the first direction X. The projection of the insulating portion 32 along the second direction Y at least partially falls within the battery cells 2.

[0042] In this embodiment, one end of the support portion 31 of the insulating base 3 is connected to the end plate 1 and extends along the second direction Y toward the direction away from the end plate 1, and is connected to the end of the output electrode 4 away from the cell 2; one end of the insulating portion 32 of the insulating base 3 is connected to the support portion 31, and the other end extends along the first direction X toward the cell 2, thereby forming a "7-shaped structure" between the support portion 31 and the insulating portion 32. While ensuring connection stability, the insulating portion 32 is disposed between the cell 2 and the output electrode 4, thereby forming insulation protection between the output electrode 4 and the end plate 1, and the insulating portion 32 extends along the second direction Y. The projection of Y at least partially falls inside the cell 2, that is, the insulating part 32 extends into the inside of the cell 2 in the first direction X, thereby increasing the creepage distance between the end plate 1 and the output electrode 4 in the first direction X. Compared with related technologies, it is not necessary to open an opening on the end plate 1 to increase the creepage distance between the end plate 1 and the output electrode 4 in the second direction Y, so as to ensure the total creepage distance between the end plate 1 and the output electrode 4, thereby ensuring the integrity of the end face of the end plate 1 and the cell 2, making the preload force of the end plate 1 on the cell 2 more balanced, reducing the possibility of stress concentration, and improving the stability of the cell assembly.

[0043] It should be noted that the battery cell assembly has a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other. In practical applications, the first direction X refers to the length direction of the battery cell assembly, the second direction Y refers to the height direction of the battery cell assembly, and the third direction Z refers to the width direction of the battery cell assembly; the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0044] Specifically, it can be "perpendicular" in the strict sense, meaning that the angle between any two of the first direction X, the second direction Y, and the third direction Z is 90°; or it can be "approximately perpendicular," specifically meaning that the angle between any two of the first direction X, the second direction Y, and the third direction Z includes a certain error. Considering the measurement and the error associated with the measurement of a specific quantity (i.e., the limitations of the measurement system), this error is within the acceptable deviation range for a specific value as determined by a person skilled in the art. For example, the angle between any two of the first direction X, the second direction Y, and the third direction Z is 90° ± 10°, and will not be elaborated further hereafter.

[0045] In specific applications, multiple battery cells 2 are arranged between end plates 1 along a first direction X. Specifically, two end plates 1 are provided, spaced apart along the first direction X, so that the two end plates can clamp the multiple battery cells 2. The arrangement of the multiple battery cells 2 along the first direction X can be such that the multiple battery cells 2 form a row in a third direction Z, thus being arranged between the two end plates 1; or the multiple battery cells 2 can be arranged in multiple rows in a third direction Z, with multiple rows of battery cells 2 arranged side by side between the two end plates 1. For example, as shown in the example... Figure 1 As shown, multiple battery cells 2 are arranged in two rows in the third direction Z, and the two rows of battery cells 2 are arranged side by side between two end plates 1; of course, other arrangements are also possible, as long as the multiple battery cells 2 are electrically connected normally and are clamped by the two end plates 1 in the first direction X. Those skilled in the art can make the settings according to actual needs, and this application does not limit them.

[0046] Preferably, multiple battery cells 2 are arranged between the end plates 1 along the first direction X, which is the thickness direction of the battery cells 2. That is, the large surface (wide surface) of two adjacent battery cells 2 are attached, so that more battery cells 2 can be accommodated between the two end plates 1. The large surface specifically refers to the end face of the battery cell 2 with the largest surface area. The distance between two opposite large surfaces is the thickness of the battery cell 2.

[0047] Understandably, the battery cell 2 adjacent to end plate 1 is also electrically connected to an output terminal 4, thereby facilitating the electrical connection of multiple battery cells 2 to an external circuit. Specifically, the output terminal 4 refers to the terminal that leads out the total positive and total negative terminals of multiple battery cells 2, which can be an aluminum busbar, copper busbar, etc. Figure 1 As shown, there are two output poles 4, which are arranged at intervals along the third direction Z. One output pole 4 is the overall positive pole, and the other output pole 4 is the overall negative pole. An insulating base 3 is provided between each output pole 4 and the end plate 1.

[0048] It should be noted that one end of the support portion 31 of the insulating base 3 is connected to the end plate 1, and the other end extends toward the output electrode 4 to connect with the end of the output electrode 4 away from the cell 2. This ensures the stability of the output electrode 4 while providing a fulcrum for connecting the output electrode 4 to the external circuit. One end of the insulating portion 32 of the insulating base 3 is connected to the support portion 31, and the other end extends toward the cell 2 along the first direction X. The insulating portion 32 extends between the cell 2 and the output electrode 4, thereby providing insulation protection for the output electrode 4 and increasing the creepage distance between the end plate 1 and the output electrode 4 in the first direction X. This means that the creepage distance between the end plate 1 and the output electrode 4 in the second direction Y can be reduced, thus eliminating the need to open an additional opening on the end plate 1 to increase the distance between the end plate 1 and the output electrode 4 in the second direction Y.

[0049] It needs to be explained that an insulating base 3 is provided between the end plate 1 and the output electrode 4. The supporting part 31 and the insulating part 32 of the insulating base 3 specifically form a "7-shaped structure". According to the definition of creepage distance, the creepage distance between the end plate 1 and the output electrode 4 is the sum of the vertical height of the supporting part 31 and the horizontal length of the insulating part 32. Specifically, it should be: the distance between the plane of the supporting part 31 in contact with the end plate 1 and the output electrode 4 in the second direction Y (that is, the creepage distance between the end plate 1 and the output electrode 4 in the vertical direction), and the length of the insulating part 32 in the first direction X (that is, the creepage distance between the end plate 1 and the output electrode 4 in the horizontal direction). The sum of the two is the final creepage distance between the end plate 1 and the output electrode 4. Therefore, when the length of the insulating part 32 in the first direction X is increased, the creepage distance between the end plate 1 and the output electrode 4 in the vertical direction can be relatively reduced if relevant regulations are met, so that it is not necessary to open an opening on the end plate 1 to ensure the distance between the end plate 1 and the output electrode 4 in the vertical direction.

[0050] Understandably, the other end of the insulating portion 32 extends toward the cell 2 along the first direction X, and the projection of the insulating portion 32 along the second direction Y at least partially falls within the cell 2. Specifically, the projection of the insulating portion 32 along the second direction Y may partially fall within the cell 2, or the projection of the insulating portion 32 along the second direction Y may fall entirely within the cell 2. In other words, the insulating portion 32 extends into the area of ​​the cell 2 in the first direction X. Compared with related technologies, the length of the insulating portion 32 in the first direction X of this application is longer to ensure the creepage distance between the end plate 1 and the output electrode 4. The insulating portion 32 is located between the end plate 1 and the output electrode 4 in the second direction Y to provide insulation isolation.

[0051] like Figure 1As shown, in some embodiments of this application, multiple electrical connectors 9 are also included. The battery cell 2 is provided with a positive terminal and a negative terminal (not shown in the figure). One electrical connector 9 connects the positive terminals of two adjacent battery cells 2 together, and another electrical connector 9 connects the negative terminals of two adjacent battery cells 2 together, thereby connecting multiple battery cells 2 in parallel and outputting to the outside through the output terminal 4. When multiple battery cells 2 are arranged in multiple rows in the third direction Z, one of the electrical connectors 9 connects the positive and negative terminals of two adjacent battery cells 2 at the end of two rows of battery cells 2 together, so that the two rows of battery cells 2 are connected in series, and finally form a total positive terminal (positive output terminal) and a total negative terminal (negative output terminal) to facilitate electrical connection with external circuits.

[0052] Understandably, the electrical connector 9 can be an aluminum busbar, a copper busbar, etc., and those skilled in the art can choose according to actual needs. This application does not impose any restrictions on this.

[0053] like Figure 2 As shown, in some embodiments of this application, the minimum distance between the end plate 1 and the output electrode 4 along the second direction Y is H, and the length of the insulating part 32 along the first direction X is L, satisfying: H+L≥16mm.

[0054] In this embodiment of the application, by setting the minimum distance H between the end plate 1 and the output electrode 4 along the second direction Y and the length L of the insulation part 32 along the first direction X within a reasonable range, it is possible to ensure that the creepage distance between the end plate 1 and the output electrode 4 meets the requirements, thereby ensuring that no leakage or breakdown occurs between the end plate 1 and the output electrode 4 during the use of the battery pack.

[0055] It should be explained that when the sum of the minimum distance H between the end plate 1 and the output electrode 4 along the second direction Y and the length L of the insulation part 32 along the first direction X, H+L < 16mm, that is, when the creepage distance between the end plate 1 and the output electrode 4 does not meet the requirements, leakage and breakdown are likely to occur between the end plate 1 and the output electrode 4 during the use of the battery pack, which will cause insulation failure and easily lead to electric shock or short circuit of the equipment.

[0056] In specific applications, the sum of the minimum distance H between the end plate 1 and the output electrode 4 along the second direction Y and the length L of the insulation part 32 along the first direction X, H+L, can be set to any value such as 16mm, 17mm, 18mm, 19mm, or a range between two arbitrary values, as long as it does not make the overall size of the battery pack too large.

[0057] It should be noted that, in practical applications, when the end face of end plate 1 facing output electrode 4 is a completely flush end face, the minimum distance H between end plate 1 and output electrode 4 along the second direction Y is H. Figure 2As indicated by the markings, this means that the vertical distance between the end face of the end plate 1 that is in contact with the support part 31 and the end face of the output electrode 4 facing the end plate 1 can be measured; and when the end of the end plate 1 facing the output electrode 4 is "trapezoidal", as shown in the figure... Figure 4 As shown, when the contact portion 11 of the end plate 1 and the body portion 12 are in a "trapezoidal" shape, H is the vertical distance between the first end face 111 and the output electrode 4. Specifically, it is the thickness of the insulating portion 32 in the second direction Y. Since it is small, it can be ignored in actual calculations.

[0058] It should be noted that the length L of the insulating part 32 in the first direction X specifically refers to the distance between the end of the insulating part 32 connected to the support part 31 and the other end away from the support part 31. In actual measurement, it can also be measured by measuring the vertical distance in the first direction X between the end face of the support part 31 facing the cell 2 and the other end of the insulating part 32 away from the support part 31.

[0059] like Figure 2 As shown, in some embodiments of this application, the end plate 1 includes an abutment portion 11 and a body portion 12. The abutment portion 11 abuts against the battery cell 2 along the first direction X, and the body portion 12 is connected to the side of the abutment portion 11 away from the battery cell 2. One end of the support portion 31 is connected to the body portion 12.

[0060] In this embodiment, the body portion 12 of the end plate 1 is connected to the side of the end plate 1 that is away from the battery cell 2, and one end of the support portion 31 of the insulating base 3 is connected to the body portion 12. This prevents the connection structure between the support portion 31 and the body portion 12 from affecting the integrity of the abutment portion 11, thereby ensuring that the abutment portion 11 has a complete end face that abuts against the battery cell 2. This ensures the consistency and uniformity of the pre-tightening force of the end plate 1 on the battery cell 2, reduces the possibility of stress concentration, and improves the reliability of the battery cell assembly.

[0061] In specific applications, multiple battery cells 2 are arranged between two end plates 1. During the use of battery cells 2, the battery cells 2 will expand. The abutment portion 11 of the end plate 1 abuts against the battery cells 2. Thus, when the battery cells 2 expand, the abutment portion 11 of the end plate 1 can provide a pre-tightening force to the battery cells 2, thereby reducing the possibility of excessive expansion of the battery cells 2. The body portion 12 is arranged on the side of the abutment portion 11 away from the battery cells 2. The body portion 12 is provided with a structure that connects to the support portion 31, thereby ensuring the connection stability of the insulating base 3. Specifically, it can be a mounting groove, mounting post, etc. At the same time, the body portion 12 can also be reserved with connection holes, so that the battery cell group can be connected to the battery pack housing by bolts, etc., to ensure the stability of the battery cell group in the battery pack.

[0062] like Figure 3As shown, in some embodiments of this application, the side face of the contact portion 11 facing the output electrode 4 is the first end face 111, and the first end face 111 is flush with the side face of the cell 2 facing the output electrode 4.

[0063] In this embodiment, by setting the first end face 111 of the abutment portion 11 to be flush with the end face of the cell 2 facing the output electrode 4, the end face of the abutment portion 11 facing the cell 2 can be adapted to the large surface of the cell 2, so that the abutment portion 11 can apply pre-tightening force to every part of the large surface of the cell 2, thereby ensuring the balance of the pre-tightening force on the cell 2, reducing the possibility of local stress concentration, reducing the risk of local short circuit of the cell 2, and improving the reliability of the cell assembly.

[0064] In practical applications, the first end face 111 of the contact portion 11 facing the output electrode 4 is flush with the side end face of the cell 2 facing the output electrode 4. This also allows the output electrode 4 extending from the cell 2 to be connected to the support portion 31 of the insulating base 3 without excessive bending, thus improving the structural stability of the output electrode 4.

[0065] Understandably, in actual processing, the end face of the contact portion 11 facing away from the output electrode 4 is flush with the end face of the battery cell 2 facing away from the output electrode 4, thereby ensuring that the area of ​​the contact portion 11 in the vertical plane is equal to the large surface of the battery cell 2.

[0066] It should be noted that end plate 1 can be die-cast aluminum plate, extruded aluminum plate, welded aluminum plate, spliced ​​aluminum plate, steel plate, etc.

[0067] like Figure 3 As shown, in some embodiments of this application, the projected area of ​​the abutment portion 11 in the first direction X is equal to the sum of the large surface areas of all adjacent battery cells 2, thereby enabling the abutment portion 11 to apply equal preload to each large surface of the adjacent battery cells 2, thus ensuring the balance of preload on all battery cells 2 and reducing the possibility of local stress concentration.

[0068] In specific applications, such as Figure 3 As shown, the battery cells 2 can be arranged in two rows along the third direction Z, then the projected area of ​​the contact portion 11 in the first direction X is equal to the sum of the large surface areas of the two battery cells 2; of course, the battery cells 2 can also be arranged in one row, three rows, etc., and the projected area of ​​the contact portion 11 in the first direction X can be set accordingly depending on the arrangement of the battery cells 2.

[0069] like Figure 3As shown, in some embodiments of this application, the battery cell assembly further includes an insulating cover 7, which is disposed on the side of the plurality of battery cells 2 facing the output electrode 4, thereby forming an insulating protection for the battery cells 2 in the second direction Y; the battery cell assembly also includes an insulating plate 8, which is disposed between the contact portion 11 and the battery cell 2, thereby forming an insulating isolation between the contact portion 11 and the large surface of the battery cell 2.

[0070] Specifically, the insulating cover 7 and the insulating board 8 can be made of insulating materials such as plastic and rubber.

[0071] like Figure 2 As shown, in some embodiments of this application, the thickness of the battery cell 2 along the first direction X is D, and the thickness of the abutment portion 11 along the first direction X is W, satisfying: 16mm≤LW<D / 2.

[0072] In the application embodiment, when the first end face 111 of the abutment portion 11 is flush with the end face of the cell 2 facing the output electrode 4, the creepage distance between the end plate 1 and the output electrode 4 is specifically the straight-line distance between the end face of the abutment portion 11 facing the cell 2 and the output electrode 4 in the first direction X (the end plate 1 and the output electrode 4 are metal parts, and the shortest distance along the surface of the insulating base 3 between them). In actual calculation, it is the difference between the length L of the insulating portion 32 in the first direction X and the thickness W of the abutment portion 11 in the first direction X. That is, LW needs to meet the relevant insulation requirements. Thus, by setting the difference between the length L of the insulating portion 32 in the first direction X and the thickness W of the abutment portion 11 in the first direction X within a reasonable range, the creepage distance between the end plate 1 and the output electrode 4 can be guaranteed, thereby improving the insulation performance of the cell assembly.

[0073] It should be noted that in practical applications, an insulating film is also provided between the contact part 11 and the battery cell 2 in the first direction X. Since the thickness of the insulating film is relatively thin, it can be ignored in the calculation here.

[0074] It should be explained that when the difference between the length of the insulating part 32 in the first direction X and the thickness of the abutment part 11 in the first direction X, LW < 16mm, the creepage distance between the end plate 1 and the output electrode 4 cannot meet the requirements, which can easily lead to leakage or breakdown between the end plate 1 and the output electrode 4. When the difference between the length of the insulating part 32 in the first direction X and the thickness of the abutment part 11 in the first direction X, LW > D / 2, interference will occur between the insulating part 32 and the welding point between the output electrode 4 and the terminal post of the battery cell 2, affecting the installation of the insulating part 32.

[0075] In specific applications, the difference between the length of the insulating part 32 along the first direction X and the thickness of the abutting part 11 along the first direction X, LW, can be set to any value such as 16mm, 17mm, 18mm, or a range between two arbitrary values.

[0076] It should be noted that in practical applications, the top of the battery cell 2 is provided with a positive terminal and a negative terminal. The positive terminal and the negative terminal are usually located on the center line in the thickness direction of the battery cell 2. The output electrode 4 is electrically connected to the positive terminal and the negative terminal by welding. During welding, a certain range of welding area is formed. If the insulation part 32 is too long, it will interfere with the welding area, making it impossible to install.

[0077] like Figure 4 As shown, in some embodiments of this application, the height of the body portion 12 along the second direction Y is less than the height of the abutment portion 11 along the second direction Y.

[0078] In this embodiment, by setting the height of the body portion 12 along the second direction Y to be less than the height of the abutment portion 11 along the second direction Y, that is, forming a "stepped structure" at at least one end of the end plate 1 along the second direction Y, it is possible to ensure that the abutment portion 11 and the large surface of the cell 2 are completely abutted together, while on the one hand, it is convenient to set a structure on the body portion 12 that connects to the insulating base 3, such as a mounting groove or a mounting protrusion; on the other hand, it is possible to reduce the overall weight of the end plate 1; and on the other hand, it is convenient to set a connection hole on the body portion 12, so as to fix the cell group to the battery pack housing by bolts.

[0079] like Figure 4 As shown, the main body 12 is provided with a slot 121 at one end facing the output pole 4, and the support part 31 is provided with a buckle 311. The slot 121 and the buckle 311 are engaged in a locking fit.

[0080] Alternatively, the end of the main body 12 facing the output pole 4 is provided with a buckle (not shown in the figure), and the end of the support part 31 away from the output pole 4 is provided with a slot (not shown in the figure), and the slot and buckle are engaged.

[0081] In this embodiment, by providing slots or buckles on one end of the main body 12 facing the output pole 4 and on the support 31 respectively, the insulating base 3 can be installed by engaging the buckle with the slot, which facilitates installation and disassembly and maintenance.

[0082] In specific applications, such as Figure 6 As shown, a slot 121 can be provided at the end of the main body 12 facing the output pole 4, and a buckle 311 can be provided at the support part 31. In this way, during installation, the buckle 311 can be directly snapped into the slot 121 to complete the installation of the insulating base 3. Alternatively, a buckle can be provided at the end of the main body 12 facing the output pole 4, and a slot can be provided at the end of the support part 31 away from the output pole 4. Of course, other detachable connection forms, such as interference fit, can also be used, as long as they can facilitate the installation of the insulating base 3 while ensuring the stability of the connection. Those skilled in the art can make settings according to actual needs, and this application does not limit them.

[0083] like Figure 4 As shown, in some embodiments of this application, the abutment portion 11 and the body portion 12 are integrally formed.

[0084] In this embodiment of the application, by setting the abutment portion 11 and the body portion 12 as an integrally formed part, the structural strength of the end plate 1 is guaranteed, and it is also easy to process.

[0085] In specific applications, the abutment part 11 and the body part 12 can be manufactured by die casting, thereby ensuring the structural strength of the end plate 1.

[0086] like Figure 5 As shown, in some embodiments of the application, the insulating portion 32 is provided with a groove 321 on the side facing the output electrode 4, and the output electrode 4 is at least partially disposed in the groove 321.

[0087] In this embodiment, by at least partially disposing the output electrode 4 within the groove 321 of the insulating portion 32, insulation protection can be formed on the output electrode 4 in the third direction Z, thereby further improving the insulation performance of the battery pack.

[0088] like Figure 5 As shown, in some embodiments of this application, the support portion 31 has a threaded hole at one end facing the output electrode 4, and the battery cell assembly also includes a fastener 6. The end of the output electrode 4 away from the battery cell 2 is connected to the threaded hole on the support portion 31 through the fastener 6. While ensuring connection stability, this provides an external circuit with a fulcrum for connecting to the output electrode 4.

[0089] Understandably, such as Figure 5 As shown, in specific applications, the support part 31 has an opening on the side away from the battery cell 2, which facilitates external circuitry. For example, the busbar extends into and is electrically connected to the output terminal 4.

[0090] like Figure 7 As shown, in some embodiments of this application, the battery pack further includes a protective element 5, which is disposed on the side of the support portion 31 away from the end plate 1. The protective element 5 is connected to the support portion 31 to cover part of the output electrode 4.

[0091] In this embodiment, the protective member 5 is connected to the support portion 31, thereby covering part of the output electrode 4. That is, the protective member 5 can form insulation protection for the output electrode 4 on the side away from the support portion 31, thereby improving the insulation performance of the battery pack.

[0092] In specific applications, the protective component 5 forms a "cover" on the top of the support part 31, thereby providing insulation protection for the output pole 4. In practical applications, the protective component 5 can be detachably connected to the support part 31 through snap-fit, threaded connection, or other means, thus facilitating disassembly and assembly.

[0093] Understandably, in practical applications, the insulating base 3 and the protective component 5 can be made of insulating materials such as plastic; for example, plastic can be processed into the insulating base 3 and the protective component 5 through injection molding, which ensures insulation performance while facilitating processing.

[0094] In some embodiments of this application, the end plate 1 is a die-cast integral part.

[0095] In this embodiment of the application, by setting the end plate 1 as a die-cast integral molded part, it is easy to process while ensuring the structural strength of the end plate 1, so that the end plate 1 can provide reliable protection for the internal battery cell 2.

[0096] In specific applications, for example, the end plate 1 is die-cast from lightweight, high-strength materials such as aluminum alloy, which not only reduces the overall weight of the battery pack, but also allows for the manufacture of complex geometries. Compared to welded or spliced ​​end plates, the die-cast end plate 1 has better bending, compressive, and shock resistance, and is suitable for mass production, reducing the cost of a single end plate 1.

[0097] In some embodiments of this application, a battery pack is also proposed, comprising the cell assembly as described in any of the above embodiments.

[0098] In this embodiment, the battery cell assembly includes: an end plate 1, a plurality of battery cells 2, an insulating base 3, and an output electrode 4. The battery cell assembly has a first direction X and a second direction Y that are perpendicular to each other. The plurality of battery cells 2 are arranged between the end plates 1 along the first direction X. The output electrode 4 is disposed at one end of the end plate 1 along the second direction Y and is electrically connected to the battery cells 2 adjacent to the end plate 1. The insulating base 3 includes a support portion 31 and an insulating portion 32. One end of the support portion 31 is connected to the end plate 1, and the other end of the support portion 31 is connected to the end of the output electrode 4 away from the battery cells 2. The insulating portion 32 is disposed between the battery cells 2 and the output electrode 4 along the second direction Y, and one end of the insulating portion 32 is connected to the support portion 31. The other end of the insulating portion 32 extends toward the battery cells 2 along the first direction X. The projection of the insulating portion 32 along the second direction Y at least partially falls within the battery cells 2. Thus, the support part 31 and the insulation part 32 form a "7-shaped structure". While ensuring connection stability, the insulation part 32 is located between the battery cell 2 and the output electrode 4, thereby forming insulation protection between the output electrode 4 and the end plate 1. The projection of the insulation part 32 along the second direction Y falls inside the battery cell 2, that is, the insulation part 32 extends into the interior of the battery cell 2 in the first direction X, thereby increasing the creepage distance between the end plate 1 and the output electrode 4 in the first direction X. Compared with related technologies, it is not necessary to open an opening on the end plate 1 to increase the creepage distance between the end plate 1 and the output electrode 4 in the second direction Y, so as to ensure the total creepage distance between the end plate 1 and the output electrode 4, thereby ensuring the integrity of the end face of the end plate 1 and the battery cell 2, making the preload force of the end plate 1 on the battery cell 2 more balanced, reducing the possibility of stress concentration, and improving the stability of the battery cell assembly.

[0099] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0100] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell assembly, characterized in that, include: The battery pack comprises an end plate (1), multiple battery cells (2), an insulating base (3), and an output electrode (4). The battery cell group has a first direction (X) and a second direction (Y) that are perpendicular to each other. The multiple battery cells (2) are arranged between the end plates (1) along the first direction (X). The output electrode (4) is located at one end of the end plate (1) along the second direction (Y) and is electrically connected to the battery cells (2) adjacent to the end plate (1). The insulating base (3) includes a support portion (31) and an insulating portion (32). One end of the support portion (31) is connected to the end plate (1), and the other end of the support portion (31) is connected to the end of the output electrode (4) away from the cell (2). The insulating portion (32) is disposed between the cell (2) and the output electrode (4) along the second direction (Y), and one end of the insulating portion (32) is connected to the support portion (31). The other end of the insulating portion (32) extends toward the cell (2) along the first direction (X). The projection of the insulating portion (32) along the second direction (Y) at least partially falls within the cell (2).

2. The battery cell assembly according to claim 1, characterized in that, The minimum distance between the end plate (1) and the output electrode (4) along the second direction (Y) is H, and the length of the insulating part (32) along the first direction (X) is L, satisfying: H+L≥16mm.

3. The cell assembly according to claim 2, characterized in that, The end plate (1) includes an abutment portion (11) and a body portion (12). The abutment portion (11) abuts against the battery cell (2) along the first direction (X). The body portion (12) is connected to the side of the abutment portion (11) away from the battery cell (2). One end of the support portion (31) is connected to the body portion (12).

4. The battery cell assembly according to claim 3, characterized in that, The end face of the contact portion (11) facing the output electrode (4) is the first end face (111), and the first end face (111) is flush with the end face of the cell (2) facing the output electrode (4).

5. The cell assembly according to claim 4, characterized in that, The thickness of the battery cell (2) along the first direction (X) is D, and the thickness of the abutting part (11) along the first direction (X) is W, satisfying: 16mm≤LW<D / 2.

6. The battery cell assembly according to claim 4, characterized in that, The height of the body part (12) along the second direction (Y) is less than the height of the abutting part (11) along the second direction (Y).

7. The battery cell assembly according to claim 3, characterized in that, The main body (12) has a slot (121) at one end facing the output pole (4), and the support part (31) has a buckle (311). The slot (121) and the buckle (311) engage with each other. Alternatively, the body part (12) is provided with a buckle at one end facing the output pole (4), and the support part (31) is provided with a slot at one end away from the output pole (4), and the slot engages with the buckle.

8. The battery cell assembly according to claim 3, characterized in that, The abutting part (11) and the main body part (12) are integrally formed.

9. The battery cell assembly according to any one of claims 1-5, characterized in that, The insulating part (32) has a groove (321) on the side facing the output electrode (4), and the output electrode (4) is at least partially disposed in the groove (321).

10. The battery cell assembly according to any one of claims 1-5, characterized in that, The battery cell assembly also includes a protective element (5), which is located on the side of the support portion (31) away from the end plate (1). The protective element (5) is connected to the support portion (31) to cover part of the output electrode (4).

11. The battery cell assembly according to any one of claims 1-8, characterized in that, The end plate (1) is a die-cast integral part.

12. A battery pack, characterized in that, include: The battery pack as described in any one of claims 1-11.

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