Single cell and battery pack

Abstract

The utility model relates to a single battery cell and a battery pack, and the single battery cell comprises a single battery cell, the single battery cell is provided with a battery cell positive pole along a first side of a first direction, and the single battery cell is provided with a battery cell negative pole along a second side of the first direction; the battery cell positive pole extends out of the first side edge, the battery cell negative pole extends out of the second side edge, and the extension direction of the battery cell positive pole is opposite to the extension direction of the battery cell negative pole. According to the arrangement of the single cells, the single cells of the subsequent battery pack can be connected without a busbar, and electric connection can be realized through direct contact of positive and negative electrodes of adjacent single cells, so that the use of the busbar is omitted, the occupied space and weight of the busbar are reduced, the energy density is improved, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a single battery cell and a battery pack. Background Art

[0002] With the development of electric vehicles and energy storage devices, the requirements for battery life and charging and discharging efficiency are becoming increasingly higher, which requires the energy density and heat dissipation efficiency of battery packs to be gradually improved.

[0003] In the related art, a battery pack is provided with a battery group, which generally includes single cells and a bus. The electrical connection between the single cells in the battery pack is achieved by connecting the bus to the single cells. The bus occupies a larger space of the battery pack and increases the overall weight of the battery pack. Therefore, the setting of the bus is not conducive to improving the energy density of the battery pack, and further is not conducive to improving the energy density of the battery pack. In addition, the setting of the bus complicates the assembly operation of the battery pack. Summary of the Invention

[0004] The present application provides a single cell and a battery pack, in which the negative electrode column of a single cell can be used to partially overlap with the positive electrode column of another single cell to achieve direct electrical connection, thereby omitting the use of a bus, reducing the space and weight occupied by the bus, improving energy density, reducing costs, and simplifying assembly operations.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, comprising:

[0006] A positive electrode column and a negative electrode column of a battery cell, wherein the first side of the single battery cell along the first direction is provided with a positive electrode column of the battery cell, and the second side of the single battery cell along the first direction is provided with a negative electrode column of the battery cell;

[0007] The positive electrode column of the battery cell extends beyond the first side edge, and the negative electrode column of the battery cell extends beyond the second side edge, and the extending direction of the positive electrode column of the battery cell is opposite to the extending direction of the negative electrode column of the battery cell.

[0008] In combination with the first aspect, in one embodiment, the first direction is the length direction of the single battery cell; the positive electrode column of the battery cell extends to the outside of the edge of the first side along the width direction of the single battery cell.

[0009] In the second aspect, an embodiment of the present application provides a battery pack, which includes a cell assembly, wherein the cell assembly includes a plurality of single cells as described above, and the plurality of single cells are arranged in sequence. In any two adjacent single cells, the negative electrode column of one single cell and the positive electrode column of the other single cell are located on the same side of the battery assembly and are directly electrically connected.

[0010] In combination with the second aspect, in one embodiment, in any two adjacent single battery cells, the negative electrode column of one of the single battery cells is welded or detachably connected to the positive electrode column of the other single battery cell.

[0011] In combination with the second aspect, in one embodiment, the number of the single battery cells in the battery cell assembly is an even number.

[0012] In conjunction with the second aspect, in one embodiment, a frame, wherein the battery cell assembly is assembled within the frame;

[0013] The framework includes:

[0014] Two liquid cooling plates and two end plates are connected end to end to form an assembly cavity, and the two end plates are spaced apart along the arrangement direction of the plurality of single battery cells, and the battery cell assembly is assembled in the assembly cavity.

[0015] In combination with the second aspect, in one embodiment, a reserved groove or a reserved hole is opened at one end of the end plate along the first direction, and the positive electrode column or the negative electrode column of the single battery cell adjacent to the end plate passes through the reserved groove or the reserved hole and extends to the outside of the end plate.

[0016] In combination with the second aspect, in one embodiment, two outer flanges are provided on a side of the end plate facing away from the single battery cell, and the outer flanges are connected to the liquid cooling plate.

[0017] In conjunction with the second aspect, in one embodiment, the battery pack further includes:

[0018] A sampling component is electrically connected to the positive electrode column or the negative electrode column of the battery cell in the battery cell assembly, and the plug connector of the sampling component is fixed to the liquid cooling plate.

[0019] In combination with the second aspect, in one embodiment, the water inlet and outlet of the liquid cooling plate and the sampling assembly are located at the same end of the battery pack along the first direction.

[0020] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0021] The positive electrode column and the negative electrode column of the battery cell are distributed on opposite sides of the single battery cell, and the positive electrode column and the negative electrode column of the battery cell extend outside the single battery cell in opposite directions, that is, the positive electrode column and the negative electrode column of the battery cell are arranged in parallel. The negative electrode column of the single battery cell can be used to partially overlap with the positive electrode column of another single battery cell to achieve direct electrical connection, thereby omitting the use of the bus bar, reducing the space and weight occupied by the bus bar, improving energy density, reducing costs, and simplifying assembly operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 Schematic diagram of the three-dimensional structure of a single battery cell;

[0024] Figure 2 for Figure 1 Schematic diagram of the top view structure;

[0025] Figure 3 Schematic diagram of the main structure of the battery pack;

[0026] Figure 4 for Figure 3 Schematic diagram of the rear view structure;

[0027] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of A in the middle;

[0028] Figure 6 for Figure 3 A schematic diagram of the front structure of FIG.

[0029] Figure 7 for Figure 3 Explosion diagram.

[0030] In the figure: 1. Single cell; 11. Positive column of battery cell; 12. Negative column of battery cell; 13. Explosion-proof valve; 2. Frame; 21. Liquid cooling plate; 211. Water inlet; 212. Water outlet; 22. End plate; 221. Outer flange; 222. Reserved groove; 3. Thermal insulation pad; 4. Sampling assembly; 41. Plug connector. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] An embodiment of the present application provides a single cell and a battery pack, in which the negative electrode column of a single cell can be used to partially overlap with the positive electrode column of another single cell to achieve direct electrical connection, thereby omitting the use of a bus, reducing the space and weight occupied by the bus, improving energy density, reducing costs, and simplifying assembly operations.

[0033] First, as Figure 1 and Figure 2 As shown, an embodiment of the present application provides a single battery cell, which includes: a battery cell positive electrode column 11 and a battery cell negative electrode column 12. The single battery cell 1 is provided with a battery cell positive electrode column 11 on a first side along a first direction, and the single battery cell 1 is provided with a battery cell negative electrode column 12 on a second side along the first direction. The first side and the second side are opposite sides of the single battery cell 1; the battery cell positive electrode column 11 extends beyond the first side edge, and the battery cell negative electrode column 12 extends beyond the second side edge, and the extension direction of the battery cell positive electrode column 11 is opposite to the extension direction of the battery cell negative electrode column 12.

[0034] For example, specific reference Figure 2 A positive electrode column 11 is installed on the left side of the single battery cell 1, and a negative electrode column 12 is installed on the right side thereof. The lower end of the positive electrode column 11 extends downward to the outside of the lower edge of the single battery cell 1, and the upper end of the negative electrode column 12 extends upward to the outside of the upper edge of the single battery cell 1. The positive electrode column 11 and the negative electrode column 12 are arranged in parallel, so that the negative electrode columns 12 and the positive electrode columns 11 of the two single battery cells 1 can partially overlap to achieve direct electrical connection.

[0035] Specifically, the positive electrode column 11 and the negative electrode column 12 are distributed on opposite sides of the single cell 1, and the positive electrode column 11 and the negative electrode column 12 extend to the outside of the single cell 1 in opposite directions, that is, the positive electrode column 11 and the negative electrode column 12 are arranged in parallel, and the negative electrode column 12 of the single cell 1 can be used to partially overlap with the positive electrode column 11 of another single cell 1 to achieve direct electrical connection, thereby omitting the use of the bus, reducing the space and weight occupied by the bus, improving energy density, reducing costs, and simplifying assembly operations.

[0036] In combination with the first aspect, in one embodiment, Figure 1 As shown, explosion-proof valves 13 are provided on the first and second sides of the single cell 1. For example, the explosion-proof valves 13 can be provided on the first side and the middle area of ​​the first side of the single cell 1. The explosion-proof valves 13 are configured to rupture and release gas from the single cell 1 when the internal pressure of the single cell 1 exceeds a set pressure, thereby ensuring that the pressure inside the single cell 1 does not become too high and thus avoiding the risk of battery explosion.

[0037] In combination with the first aspect, in one embodiment, the first direction is the length direction of the single cell 1 (ie Figure 2 The positive electrode column 11 extends to the first side along the width direction of the single cell 1 (ie Figure 2 With the above arrangement, the individual battery cells 1 can be arranged along the width direction to form a battery pack. That is, the large surfaces (i.e., the surfaces with the largest area) of the individual battery cells 1 in the battery pack can be used for thermal contact with the liquid cooling plate, thereby increasing the heat dissipation area and thus improving the heat dissipation efficiency.

[0038] In other embodiments, the first direction may also be the width direction of the single battery cell, and / or the battery cell positive electrode column 11 may also extend along the thickness direction of the single battery cell 1 , which are not listed here one by one.

[0039] Second, as Figure 3 、 Figure 4 、 Figure 6 and Figure 7 As shown, an embodiment of the present application provides a battery pack, including a cell assembly; wherein the cell assembly includes a plurality of single cells 1 as mentioned above, and the plurality of single cells 1 are arranged in sequence, and in any two adjacent single cells 1, the negative electrode column 12 of one single cell 1 and the positive electrode column 11 of the other single cell 1 are located on the same side of the cell assembly and are directly electrically connected.

[0040] Exemplarily, the battery pack includes a plurality of cells as mentioned above, where the plurality includes two or more cells, specifically Figure 6 As shown, from left to right, four single battery cells 1 are arranged in a row, the negative battery cell post 12 on the back of the first single battery cell 1 is electrically connected to the positive battery cell post 11 on the back of the second single battery cell 1, the negative battery cell post 12 on the front of the second single battery cell 1 is electrically connected to the positive battery cell post 11 on the front of the third single battery cell 1, and the negative battery cell post 12 on the back of the third single battery cell 1 is electrically connected to the positive battery cell post 11 on the back of the fourth single battery cell 1.

[0041] Specifically, the positive electrode column 11 and the negative electrode column 12 of adjacent single cells 1 in the battery pack can partially overlap to achieve direct electrical connection, thereby omitting the use of the bus, reducing the space and weight occupied by the bus, improving energy density, reducing costs, and simplifying assembly operations.

[0042] In conjunction with the second aspect, in one embodiment, the number of single cells 1 in the battery cell assembly is an even number. In the battery cell assembly, along the arrangement direction of the multiple single cells 1, in the two single cells 1 located at both ends, the negative electrode column of one single cell 1 can serve as the negative output electrode of the battery cell assembly, and the positive electrode column of the other single cell 1 can serve as the positive output electrode of the battery cell assembly; by providing an even number of single cells 1, the positive output electrode and the negative output electrode of the battery cell assembly can be located on the same side of the battery cell assembly, which facilitates the layout of related circuits, is conducive to improving space utilization, and further helps to improve energy density.

[0043] In conjunction with the second aspect, in one embodiment, in any two adjacent single battery cells 1, the negative electrode post 12 of the first single battery cell 1 is welded or detachably connected to the positive electrode post 11 of the second single battery cell 1. The welding or detachable connection of the negative electrode post 12 of the first single battery cell 1 and the positive electrode post 11 of the second single battery cell 1 can both achieve electrical connection between the adjacent single battery cells 1. The detachable connection can be a simple overlap or a connection using fasteners such as bolts.

[0044] In conjunction with the second aspect, in one embodiment, Figure 6 As shown, between any two adjacent single cells 1, a thermal insulation pad 3 is provided between the first single cell 1 and the second single cell 1. Providing the thermal insulation pad 3 between adjacent single cells 1 can achieve gap control between the single cells 1, ensure consistent welding distances between the single cells 1, and achieve thermal insulation between the single cells 1.

[0045] In conjunction with the second aspect, in one embodiment, Figure 6 As shown, it includes a frame 2, and the battery cell assembly is assembled in the frame 2; the frame 2 may include: two liquid cooling plates 21 and two end plates 22, the two liquid cooling plates 21 and the two end plates 22 are connected end to end in sequence to form an assembly cavity, and the two liquid cooling plates 21 are distributed at intervals, and the battery cell assembly is assembled in the assembly cavity.

[0046] For example, specific reference Figure 6 Two liquid cooling plates 21 are spaced apart and arranged parallel to each other in the vertical direction. A first end plate 22 is fixed between the right ends of the two liquid cooling plates 21, and a second end plate 22 is fixed between the left ends of the two liquid cooling plates 21, thereby forming an assembly cavity for assembling the battery cell assembly. By using the liquid cooling plates 21 as the frame for fixing the battery pack, both surfaces of the individual battery cells 1 can be cooled, which not only improves the cooling efficiency of the individual battery cells 1 but also saves the side plates used to fix the individual battery cells 1.

[0047] In conjunction with the second aspect, in one embodiment, a thermally conductive structural adhesive is disposed between the liquid cooling plate 21 and the individual battery cells 1. This adhesive is an adhesive that combines both structural and thermal conductivity. Its primary functions are fixing, connecting, and conducting heat. It ensures structural stability and reliability under harsh operating conditions such as high temperature, vibration, and humidity.

[0048] In conjunction with the second aspect, in one embodiment, Figure 6 and Figure 7 As shown, a reserved slot 222 is provided at one end of the end plate 22 along the first direction. The positive electrode column 11 or the negative electrode column 12 of the single battery cell 1 adjacent to the end plate extends through the reserved slot 222 to the outside of the end plate 22, thereby facilitating the connection of the positive electrode column 11 or the negative electrode column 12 of the battery cell serving as the output electrode with the outside, while also achieving the limited fixation of the output electrode. The outside of the end plate 22 is the side away from the battery cell assembly. In other embodiments, the reserved slot 222 can also be set as a reserved hole (not shown).

[0049] For details, see Figure 6 The reserved groove 222 of the end plate 22 at the left end is used to assemble the positive electrode column 11 of the adjacent single battery cell 1, and the reserved groove 222 of the end plate 22 at the right end is used to assemble the negative electrode column 12 of the adjacent single battery cell 1, thereby realizing the limited fixation of the output poles at both ends of the battery pack.

[0050] In conjunction with the second aspect, in one embodiment, Figure 6 and Figure 7 As shown, two outer flanges 221 are provided on the side of the end plate 22 facing away from the single battery cell 1 , and the outer flanges 221 are connected to the liquid cooling plate 21 , specifically, they can be threaded connections.

[0051] In conjunction with the second aspect, in one embodiment, Figure 6 and Figure 7 As shown, the battery pack may further include: a sampling assembly 4, the sampling assembly 4 is electrically connected to the positive electrode column 11 or the negative electrode column 12 of the battery cell assembly, and the plug connector 41 of the sampling assembly 4 is fixed to the liquid cooling plate 21. For example, as Figure 6 As shown, a sampling component 4 is arranged on the front of the battery pack to sample and monitor the voltage and temperature of the single cells in the cell assembly. The plug connector 41 of the sampling component 4 can be fixed to the liquid cooling plate 21 through a bayonet. The sampling component is a wiring harness, FPC or FFC, etc.

[0052] In conjunction with the second aspect, in one embodiment, Figure 6 and Figure 7 As shown, the water inlet 211 and the water outlet 212 of the liquid cooling plate 21 and the sampling assembly 4 are located at the same end of the battery pack along the first direction.

[0053] Illustratively, the water inlet 211 and the water outlet 212 of the liquid cooling plate 21 , the sampling harness and the plug connector 41 of the sampling assembly 4 are located at the front end surface of the battery pack, which can improve the space utilization of the battery pack.

[0054] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0055] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0056] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A single battery cell, characterized in that: It includes: A battery cell positive electrode column (11) and a battery cell negative electrode column (12), wherein the battery cell (1) is provided with the battery cell positive electrode column (11) on a first side along a first direction, and the battery cell (1) is provided with the battery cell negative electrode column (12) on a second side along the first direction; The battery cell positive electrode column (11) extends beyond the first side edge, the battery cell negative electrode column (12) extends beyond the second side edge, and the extending direction of the battery cell positive electrode column (11) is opposite to the extending direction of the battery cell negative electrode column (12).

2. The single cell according to claim 1, wherein: The first direction is the length direction of the single battery cell (1); the battery cell positive electrode column (11) extends to the outside of the edge of the first side along the width direction of the single battery cell (1).

3. A battery pack, characterized in that: It includes: A battery cell assembly, wherein the battery cell assembly comprises a plurality of single battery cells (1) as described in any one of claims 1 to 2, wherein the plurality of single battery cells (1) are arranged in sequence, and in any two adjacent single battery cells (1), the negative electrode column (12) of one of the single battery cells (1) and the positive electrode column (11) of the other of the single battery cells (1) are located on the same side of the battery cell assembly and are directly electrically connected.

4. The battery pack according to claim 3, wherein: In any two adjacent single battery cells (1), the negative electrode column (12) of one of the single battery cells (1) is welded or detachably connected to the positive electrode column (11) of the other of the single battery cells (1).

5. The battery pack according to claim 3, wherein: The number of the single battery cells (1) in the battery cell assembly is an even number.

6. The battery pack according to claim 3, wherein: Also includes: A frame (2), wherein the battery cell assembly is assembled in the frame (2); The framework (2) comprises: Two liquid cooling plates (21) and two end plates (22), the two liquid cooling plates (21) and the two end plates (22) are sequentially connected end to end to form an assembly cavity, and the two end plates (22) are spaced apart along the arrangement direction of the plurality of single battery cells (1), and the battery cell assembly is assembled in the assembly cavity.

7. The battery pack according to claim 6, wherein: A reserved groove (222) or a reserved hole is provided at one end of the end plate (22) along the first direction, and a positive electrode column (11) or a negative electrode column (12) of the single battery cell (1) adjacent to the end plate (22) passes through the reserved groove (222) or the reserved hole and extends to the outside of the end plate (22).

8. The battery pack according to claim 6, wherein: Two outer flanges (221) are provided on a side of the end plate (22) facing away from the single battery cell (1), and the outer flanges (221) are connected to the liquid cooling plate (21).

9. The battery pack according to claim 6, wherein: Also includes: A sampling assembly (4) is electrically connected to a positive electrode column (11) or a negative electrode column (12) in the battery assembly, and a plug connector (41) of the sampling assembly (4) is fixed to the liquid cooling plate (21).

10. The battery pack according to claim 9, wherein: The water inlet (211) and the water outlet (212) of the liquid cooling plate (21) and the sampling assembly (4) are located at the same end of the battery pack along the first direction.

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