CN220368096U - Battery cell assembly and battery - Google Patents

Abstract

The utility model relates to the technical field of batteries, and particularly provides a battery cell assembly and a battery. Specifically, the connecting column is used for connecting two electric cores arranged in the thickness direction, a partition plate is arranged between the two electric cores, and an included angle between the connecting column and the partition plate is any value between 70 degrees and 90 degrees. The included angle between the connecting column and the partition plate is limited to be any value between 70 degrees and 90 degrees, so that the lug of the battery cell can be stably welded with the end face of the connecting column without bending, and the connection stability of the two battery cells is ensured.

Description

Cell components and batteries

Technical field

The utility model relates to the field of battery technology, and specifically provides a battery core assembly and a battery.

Background technique

New energy vehicles have received more and more attention due to their low noise, no pollution, and high energy efficiency, which has promoted the accelerated development of new energy vehicles. At present, new energy vehicles usually use batteries as their power source, which provides a broad space for the application and development of lithium-ion batteries.

In order to increase the energy density of the battery, existing batteries generally install two cells in the same casing. However, the connection scheme between two battery cells in the prior art is poor, which may affect the stability and energy density of the battery.

Therefore, a new technical solution is needed in this field to solve the above problems.

Utility model content

The utility model aims to solve the above technical problems, that is, to solve the problem of poor connection scheme of existing batteries for two cells in the same casing.

In a first aspect, the utility model provides a battery core assembly. The battery core assembly includes two battery cores arranged in a thickness direction, a separator disposed between the two battery cores, and a separator connected to the two battery cores. The connecting post for connecting the battery cores, the angle between the connecting post and the separator is any value between 70° and 90°.

The utility model provides a connecting post for connecting two battery cores arranged along the thickness direction of the battery. The angle between the connecting post and the separator is limited to any value between 70° and 90°, thereby The terminal lug of the battery core can be firmly welded to the end face of the connecting post without bending, ensuring the stability of the connection between the two battery cores. If the angle between the connecting post and the separator is too small, a battery is required. Bending the core tabs not only increases the process steps and costs, but also easily contacts the pole pieces when the tabs are bent, causing a short circuit and affecting the stability of the connection between the two cells.

In the preferred technical solution of the above battery core assembly, the angle between the axis of the connecting post and the separator is any value between 70° and 90°.

By limiting the range of the angle between the axis of the connecting post and the separator to between 70° and 90°, it is possible to ensure that the connecting post passes through the separator smoothly, which improves the assembly efficiency of the battery and ensures the connection with the battery core. When welding the tabs, there is no need to bend the tabs to ensure the stability of the connection between the connecting post and the tabs, thereby ensuring the stability of the connection between the two cells and preventing the occurrence of short circuits.

In a preferred technical solution of the above battery core assembly, the battery core assembly includes a first current collector and a second current collector, and the first current collector and the second current collector are respectively located on both sides of the separator. Connected to the two battery cores respectively, the partition is provided with a through hole, and the connecting post is partially received in the through hole and connected to the first current collector and the second current collector respectively.

By electrically connecting the first current collector and the second current collector to the tabs of the two battery cores respectively, the connection reliability is better.

In a preferred technical solution of the above battery core assembly, the battery core assembly further includes a sealing member located between the connecting post and the through hole.

Through such an arrangement, the gap between the connecting column and the partition can be sealed more effectively.

In a preferred technical solution of the above battery core assembly, the sealing member includes a first sealing member and a second sealing member, and the first sealing member and the second sealing member are respectively located on both sides of the separator.

With such an arrangement, the sealing effect can be improved.

In the preferred technical solution of the above battery core assembly, the first sealing member includes a first cylindrical body and a first annular sealing portion, and the first cylindrical body is disposed between the connecting post and the through hole. , the first annular sealing portion is disposed between the first current collector and the separator; and/or the second sealing member includes a second cylindrical body and a second annular sealing portion, the second The cylindrical body is disposed between the connecting column and the through hole, and the second annular sealing portion is disposed between the second current collector and the separator.

Through such an arrangement, the sealing effect can be further improved.

In a preferred technical solution of the above battery core assembly, the battery core assembly further includes a first insulating member located between the first current collector and the separator, and/or the battery The core assembly also includes a second insulating member located between the second current collector and the separator.

Through such an arrangement, short circuits in the cells on both sides of the separator can be better avoided.

In the preferred technical solution of the above-mentioned battery core assembly, the angle between the axis of the connecting post and the separator is any value between 80° and 90°.

In the preferred technical solution of the above-mentioned battery core assembly, the number of the connecting posts is multiple and they are spaced apart along the length direction of the first current collector.

With such an arrangement, the current transmission speed can be increased.

In a preferred technical solution of the above battery core assembly, one of the first current collector and the second current collector is an aluminum plate and the other is a copper plate.

In a second aspect, the utility model provides a battery. The battery includes a casing and any of the battery core components described above. The interior of the casing is divided into a plurality of mutually independent cells by the partition plate. Chambers, a plurality of the chambers are arranged along the thickness direction of the housing and one of the electric cores is installed in each of the chambers, and two adjacent electric cores in each group are connected through the Column electrical connection.

In the preferred technical solution of the above battery, the housing includes a first housing, and one side of the partition is sealingly connected to the first housing and encloses one of the two chambers. chamber; and/or the housing includes a second housing, and the other side of the partition is sealingly connected to the second housing and encloses the other of the two chambers.

Description of the drawings

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, in which:

Figure 1 is an exploded schematic diagram of the battery of the present invention;

Figure 2 is a partially exploded schematic diagram of the battery core assembly of the present invention;

Figure 3 is a partial assembly diagram of the battery core assembly of the present invention;

FIG. 4 is a cross-sectional view taken along line A-A in FIG. 3 .

List of reference signs:

11. First housing; 12. Second housing; 2. First battery core; 3. Second battery core; 4. Partition plate; 41. Through hole; 51. First current collector; 511. Connecting post; 52. Second current collector; 61. First sealing member; 62. Second sealing member; 611. First cylindrical body; 612. First annular sealing portion; 621. Second cylindrical body; 622. Second annular Sealing part; 71. First insulating member; 72. Second insulating member; 8. Axis.

Detailed ways

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

It should be noted that in the description of the present utility model, the terms "inside", "outside", "upper", "lower", "top", "bottom" and other terms indicating directions or positional relationships are based on the figures. The directions or positional relationships shown are only for convenience of description and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

In addition, it should be noted that in the description of the present utility model, unless otherwise explicitly stipulated and limited, the terms "setting", "connection" and "installation" should be understood in a broad sense. For example, it can be a fixed connection or a fixed connection. It can be a detachable connection or an integral connection. The connection can be mechanical or electrical. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Specifically, as shown in Figure 1, the battery of the present invention includes a casing and a battery core assembly installed in the casing. The battery core assembly includes at least two battery cells and at least one separator 4, wherein the separator 4 connects the casing to the battery core assembly. The interior of the body is divided into a plurality of independent chambers. The plurality of chambers are distributed along the thickness direction of the casing, and each chamber is equipped with an electric core.

Specifically, the thickness direction is the direction perpendicular to the surface with the largest area of the shell, which is the thickness direction of the shell.

By installing multiple battery cells in the same case, the space occupied by the case can be reduced, which is beneficial to improving the energy density of the battery.

Illustratively, as shown in Figure 1, the number of partitions 4 is one, which divides the interior of the housing into two mutually independent chambers, that is, the number of chambers is two, denoted as the first chamber and the first chamber. The second chamber, the first chamber and the second chamber are distributed along the thickness direction of the shell. The shell includes a first shell 11 and a second shell 12 arranged oppositely. One side of the partition 4 is in contact with the first shell. The body 11 is sealed and connected to form a first chamber. The other side of the partition 4 is sealed and connected to the second housing 12 and forms a second chamber. The number of battery cells is also two, which is recorded as the first battery core. 2 and the second battery core 3, the first battery core 2 and the second battery core 3 are installed in the first chamber and the second chamber respectively.

It should be noted that the number of chambers is not limited to the two mentioned above. For example, the number of chambers can also be set to three or five, etc. Correspondingly, the number of partitions 4 can be set to two or Four, etc., such adjustments and changes to the specific number of chambers do not deviate from the principle and scope of the present utility model, and should be limited to the protection scope of the present utility model.

The following takes the number of chambers as two as an example to continue introducing the technical solution of the present invention.

As shown in Figures 1 and 2, the battery cell assembly of the present invention also includes a connecting post 511 for connecting two battery cells arranged along the thickness direction of the battery. The end of the connecting post 511 is provided with a first current collector 51 and second current collector 52.

The angle between the connecting column 511 and the partition 4 is any value between 70° and 90°. By limiting the angle between the connecting post 511 and the separator 4 to any value between 70° and 90°, the terminal tabs of the battery core can be connected to the end surface of the connecting post 511 without bending. Stable welding ensures the stability of the connection between the two battery cells. If the angle between the connecting post 511 and the partition 4 is too small, the battery tabs need to be bent, which not only increases the process steps and costs, but also increases the cost. When the pole lug is bent, it is easy to contact the pole piece and cause a short circuit, which affects the stability of the connection between the two cells.

Among them, the first current collector 51, the second current collector 52 and the connecting column 511 are all located in the housing, and the first current collector 51 and the second current collector 52 are respectively located on both sides of the partition 4 and are respectively located on the partition. 4 The tabs of the cells on both sides (i.e., the first cell 2 and the second cell 3) are electrically connected. The connecting post 511 is located between the first current collector 51 and the second current collector 52. The separator 4 is connected to A through hole 41 is provided at a corresponding position of the column 511 , and the connecting column 511 passes through the through hole 41 on the partition 4 to be electrically connected to the first current collector 51 and the second current collector 52 .

The first battery core 2 and the second battery core 3 are electrically connected through the first current collector 51 and the second current collector 52 located inside the housing, which is safer and has better connection reliability.

For example, as shown in FIG. 2 , the first current collector 51 is located below the separator 4 , the bottom surface of the first current collector 51 is electrically connected to the negative electrode ear of the first battery core 2 , and the connecting post 511 is disposed on the first current collector 51 . 51, the top of the connecting post 511 passes through the through hole 41 on the separator 4 and is electrically connected to the second current collector 52 above the separator 4, and the top surface of the second current collector 52 is connected to the positive electrode of the second battery core 3 Ear electrical connection.

Among them, the first current collector 51, the second current collector 52 and the connecting post 511 are all made of metal materials, such as aluminum, copper or nickel. Those skilled in the art can flexibly select the first current collector according to design requirements in practical applications. Specific materials of the current collector 51, the second current collector 52 and the connecting post 511.

It should be noted that when there are three or more chambers inside the casing and the number of battery cores is at least three, the number of connecting posts 511 is also increased accordingly to ensure that each group of two adjacent The cells are all electrically connected through a set of connecting posts 511.

In addition, it should be noted that in practical applications, those skilled in the art can arrange both the first current collector 51 and the second current collector 52 into plate-like structures, or alternatively, the first current collector 51 and the second current collector 52 can also be arranged in a plate-like structure. The current collectors 52 are both configured as a block structure, or one of the first current collector 51 and the second current collector 52 can be configured as a block structure, the other as a plate structure, and so on. This pairing Adjustments and changes in the specific shapes of the first current collector 51 and the second current collector 52 do not deviate from the principle and scope of the present invention, and should be limited to the protection scope of the present invention.

In addition, it should be noted that in practical applications, those skilled in the art can set the connecting column 511 into a cylindrical structure, or the connecting column 511 can also be set into a square column structure, or the connecting column 511 can also be configured into a cylindrical structure. It can be set into a triangular prism structure, etc. Such flexible adjustments and changes do not deviate from the principle and scope of the present utility model, and should be limited to the protection scope of the present utility model.

Of course, in the present invention, it is preferred that the connecting column 511 is provided with a cylindrical structure, and accordingly, the through hole 41 on the partition 4 is provided with a circular hole.

Preferably, as shown in Figures 3 and 4, the angle B between the axis 8 of the connecting column 511 and the partition 4 is any value between 70° and 90°.

By limiting the angle B between the axis 8 of the connecting column 511 and the partition plate 4 to between 70° and 90°, the utility model can ensure that the connecting column 511 can pass through the through hole 41 on the partition plate 4 smoothly. It is beneficial to improve the assembly efficiency of the battery.

For example, as shown in FIG. 4 , the partition 4 is arranged horizontally, the connecting column 511 is arranged vertically, and the angle B between the axis 8 of the connecting column 511 and the partition 4 is exactly 90°.

Of course, in actual applications, the connecting column 511 may not be completely vertical and may have a certain inclination, resulting in the angle B between the axis 8 of the connecting column 511 and the partition 4 being less than 90°. However, the connecting column 511 The minimum angle B between the axis 8 of the connecting column 511 and the partition 4 cannot be less than 70°. For example, the angle B between the axis 8 of the connecting column 511 and the partition 4 can be set to 70°, 72°, 75°, Any value between 78°, 80°, 82°, 85°, 88° or 90°.

Further preferably, as shown in FIG. 4 , the angle B between the axis 8 of the connecting column 511 and the partition 4 is any value between 80° and 90°. Of course, the angle B between the axis 8 of the connecting column 511 and the partition 4 is optimally 90°, that is, the connecting column 511 and the partition 4 are arranged perpendicularly.

Preferably, as shown in FIG. 2 , one of the first current collector 51 and the second current collector 52 is an aluminum plate, and the other of the first current collector 51 and the second current collector 52 is a copper plate.

Among them, the aluminum plate is connected to the negative electrode lug of the first battery core 2 , and the copper plate is electrically connected to the positive electrode lug of the second battery core 3 .

Preferably, as shown in Figure 2, the battery core assembly of the present invention also includes a sealing member, which is sleeved on the connecting post 511 and seals the gap between the connecting post 511 and the through hole 41 on the partition 4. .

By providing a sealing member to seal the gap between the connecting post 511 on the first current collector 51 and the through hole 41 on the partition plate 4, it is possible to ensure that the chambers on both sides of the partition plate 4 (i.e., the first chamber and the second chamber chamber) has a better sealing effect.

Among them, the sealing member is preferably made of rubber material.

It should be noted that in practical applications, those skilled in the art can set the sealing member as a sealing ring or a sealing sleeve, as long as the gap between the connecting column 511 and the through hole 41 on the partition plate 4 can be closed by the sealing member. Just seal it.

Preferably, as shown in FIG. 2 , the sealing member of the present invention includes a first sealing member 61 and a second sealing member 62 , wherein the first sealing member 61 and the second sealing member 62 are respectively located on both sides of the partition 4 .

By providing the first sealing member 61 and the second sealing member 62 on both sides of the partition plate 4, the sealing effect can be improved.

Wherein, the first sealing member 61 and the second sealing member 62 are both sleeved on the connecting column 511, and the ends of the first sealing member 61 and the second sealing member 62 that are close to each other are preferably in sealing fit.

Preferably, as shown in Figures 3 and 4, the first sealing member 61 includes a first cylindrical body 611 and a first annular sealing portion 612 provided on the outer wall of the first cylindrical body 611. The first cylindrical body 611 Set on the connecting column 511 , the first annular sealing portion 612 is in sealing contact with one side of the partition plate 4 .

Preferably, as shown in Figures 3 and 4, the second sealing member 62 includes a second cylindrical body 621 and a second annular sealing portion 622 provided on the outer wall of the second cylindrical body 621. The second cylindrical body 621 Set on the connecting column 511 , the second annular sealing portion 622 is in sealing contact with the other side of the partition plate 4 .

By arranging the first annular sealing part 612 and the second annular sealing part 622 to seal and fit on both sides of the separator 4 respectively, the sealing effect can be further improved.

For example, as shown in FIG. 4 , the first sealing member 61 and the second sealing member 62 are distributed in the vertical direction, the first sealing member 61 is located above the second sealing member 62 , and the first cylindrical body 611 and the second sealing member 61 are disposed vertically. The cylindrical bodies 621 are sleeved on the connecting posts 511. The bottom end of the first cylindrical body 611 is in sealing contact with the top end of the second cylindrical body 621. The first annular sealing portion 612 is in sealing contact with the upper surface of the partition 4. The second annular sealing portion 622 is in sealing contact with the lower surface of the separator 4 .

Preferably, as shown in FIG. 2 , the battery core assembly of the present invention further includes a first insulating member 71 located between the first current collector 51 and the separator 4 .

Preferably, as shown in FIG. 2 , the battery core assembly of the present invention further includes a second insulating member 72 located between the second current collector 52 and the separator 4 .

By disposing the first insulating member 71 and the second insulating member 72 respectively between the first current collector 51 and the separator 4 and between the second current collector 52 and the separator 4 , the first battery core 2 and the separator 4 can be better avoided. The second battery cell 3 is short-circuited.

When the installation is completed, the connecting posts 511 on the first current collector 51 pass through the first insulating member 71 , the separator 4 and the second insulating member 72 and are electrically connected to the second current collector 52 in sequence. The first insulating member 71 and the second insulating member 72 are preferably made of insulating materials such as plastic or rubber.

Preferably, as shown in FIG. 2 , the first current collector 51 is in a long strip shape, and the number of connecting posts 511 is multiple and distributed at intervals along the length direction of the first current collector 51 .

By arranging a plurality of connecting posts 511 to be electrically connected to the second current collector 52, the current transmission speed can be increased.

For example, the number of connecting posts 511 is two. The two connecting posts 511 are spaced apart along the length direction of the first current collector 51 . The partition 4 is each provided with a through hole 41 at a position corresponding to the two connecting posts 511 . .

It should be noted that the number of connecting columns 511 is not limited to the two mentioned above. For example, the number of connecting columns 511 can also be set to three or four, etc. This adjustment of the specific number of connecting columns 511 and Changes do not deviate from the principle and scope of the present utility model, and should be limited to the protection scope of the present utility model.

Preferably, the thickness of the first insulating member 71 is not less than 0.3 mm.

For example, in practical applications, those skilled in the art can set the thickness of the first insulating member 71 to 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1.0mm according to design requirements. any value among others.

Preferably, the thickness of the second insulating member 72 is not less than 0.3 mm.

For example, in practical applications, those skilled in the art can set the thickness of the second insulating member 72 to 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1.0mm according to design requirements. any value in .

Preferably, the partition 4 is an aluminum plate.

By arranging the separator 4 to be an aluminum plate, the weight of the battery can be reduced to meet the lightweight requirements, and in addition, the cost can be reduced.

Preferably, the thickness of the separator 4 is any value from 0.1 mm to 5 mm.

By limiting the thickness of the separator 4, this application can not only ensure that the strength of the separator 4 meets the design requirements, make the separator 4 less likely to deform or be damaged, but also prevent the separator 4 from occupying a large space and affecting the energy of the battery. density.

For example, in practical applications, those skilled in the art can set the thickness of the partition 4 to 0.1mm, 0.3mm, 0.5mm, 0.8mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0 according to design requirements. Any value from mm, 3.5mm, 4.0mm, 4.5mm or 5.0mm.

Those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not others, combinations of features of different embodiments are meant to be within the scope of the present application. and form different embodiments. For example, in the claims of this application, any of the claimed embodiments may be used in any combination.

So far, the technical solution of the present invention has been described with reference to the preferred embodiments shown in the drawings. However, those skilled in the art can easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or replacements to the relevant technical features, and the technical solutions after these changes or replacements will fall within the protection scope of the present invention.

Claims (10)

1. A battery core assembly, characterized in that the battery core assembly includes two battery cores arranged in the thickness direction, a partition disposed between the two battery cores, and a partition plate connected to the two battery cores. The angle between the connecting column and the partition plate is any value between 70° and 90°. 2. The battery core assembly according to claim 1, wherein the angle between the axis of the connecting post and the separator is any value between 70° and 90°. 3. The battery core assembly according to claim 2, wherein the battery core assembly includes a first current collector and a second current collector, and the first current collector and the second current collector are respectively located on the Both sides of the partition are respectively connected to the two battery cores. The partition is provided with a through hole. The connecting post is partially received in the through hole and connected to the first current collector and the second current collector respectively. Fluid connection. 4. The battery core assembly according to claim 3, wherein the battery core assembly further includes a sealing member located between the connecting post and the through hole. 5. The battery core assembly according to claim 4, wherein the sealing member includes a first sealing member and a second sealing member, and the first sealing member and the second sealing member are respectively located in the partition. both sides of the board. 6. The battery core assembly according to claim 5, wherein the first sealing member includes a first cylindrical body and a first annular sealing portion, and the first cylindrical body is disposed between the connecting post and the first annular sealing portion. Between the through holes, the first annular sealing portion is provided between the first current collector and the separator; and/or The second sealing member includes a second cylindrical body and a second annular sealing portion. The second cylindrical body is disposed between the connecting column and the through hole. The second annular sealing portion is disposed between the connecting post and the through hole. between the second current collector and the separator. 7. The battery core assembly according to claim 3, wherein the battery core assembly further includes a first insulating member located between the first current collector and the separator; And/or, the battery core assembly further includes a second insulating member located between the second current collector and the separator. 8. The battery core assembly according to claim 2, wherein the angle between the axis of the connecting post and the separator is any value between 80° and 90°. 9. The battery core assembly according to claim 3, wherein the number of the connecting posts is multiple and they are spaced apart along the length direction of the first current collector. 10. A battery, characterized in that, the battery includes a casing and the battery core assembly according to any one of claims 1 to 9, and the interior of the casing is divided into a plurality of mutually independent chambers, a plurality of the chambers are arranged along the thickness direction of the casing and one of the electric cores is installed in each of the chambers, and each group of two adjacent electric cores pass through the The connecting posts are electrically connected.