CN216980737U - Battery module - Google Patents

Abstract

The utility model discloses a battery module. The battery module includes: the single batteries are arranged side by side along the thickness direction of the single batteries, each single battery comprises a body and a pole along the height direction of the single battery, the body is provided with a first end and a second end along the height direction, the first end and the second end are arranged oppositely, and the distance between the first end and the second end is h; one of the plurality of fixing pieces is positioned on one side of the center line of the body in the height direction and is close to the first end, and the other of the plurality of fixing pieces is positioned on the other side of the center line of the body in the height direction and is close to the second end; the width of the fixing piece close to the first end in the height direction is L1, and L1 is more than or equal to 0.15h and less than or equal to 0.35 h; the width of the fixing piece close to the second end in the height direction is L2, and is more than or equal to 0.15h and less than or equal to L2 and less than or equal to 0.35 h. The battery module has the advantages of simple structure, long service life, high safety performance and the like.

Description

Battery module

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery module.

Background

A conventional battery module generally has a plurality of batteries and ties the plurality of batteries together by a tie for the purpose of simple structure. In the prior art, two bands are used for binding the battery, and the expansion of the electric core group is restrained by limiting the distance between the bands and the upper shoulder part and the lower shoulder part of the battery. In order to guarantee the structural strength of the battery core group, the cable tie needs to have certain strength, but the battery core can expand in the using process, so that the battery core is extruded, and the service life and the safety performance of the battery are influenced.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide a new technical solution for a battery module, which can solve the problem in the prior art that the battery life is affected due to the over-extrusion of the battery cell.

According to an object of the present invention, there is provided a battery module including: the single batteries are arranged side by side along the thickness direction of the single batteries, each single battery comprises a body and a pole along the height direction of the single battery, the body is provided with a first end and a second end along the height direction, the first end and the second end are arranged oppositely, and the distance between the first end and the second end is h; the fixing pieces are arranged on one side of the center line of the body in the height direction and close to the first end, and the fixing pieces are arranged on the other side of the center line of the body in the height direction and close to the second end, and each fixing piece is arranged on the peripheries of the single batteries in the thickness direction; the width of the fixing piece close to the first end in the height direction is L1, and L1 is more than or equal to 0.15h and less than or equal to 0.35 h; the width of the fixing piece close to the second end in the height direction is L2, and L2 is more than or equal to 0.15h and less than or equal to 0.35 h.

Optionally, the battery module further includes: a bracket connected with the second end for securing the second end.

Alternatively, L2 < L1.

Optionally, the tensile strength of the anchor proximate the second end is less than the tensile strength of the anchor proximate the first end.

Optionally, the distance between the fixing piece close to the first end and the first end is h1, the distance between the fixing piece close to the second end and the second end is h2, and h1 and h2 are both less than 0.5 h.

Alternatively, 0.1h ≦ h2 ≦ 0.35 h.

Alternatively, 0.15h ≦ h2 ≦ 0.25 h.

Optionally, the battery module further includes: the end plate, the end plate is located the both sides of a plurality of battery cell's thickness direction, the end plate is located the mounting is close to one side of a plurality of battery cell or locate the mounting is kept away from one side of a plurality of battery cell.

Optionally, the fixing member comprises: the fixing band is a ring-shaped member and is sleeved on the peripheries of the single batteries along the thickness direction of the single batteries; an adjusting member connected with the fixing band for adjusting an inner diameter of the ring-shaped member.

Optionally, the fixing band is a strip-shaped member, and the adjusting member includes: the two mounting parts are respectively in one-to-one correspondence with two ends of the fixing belt along the length direction of the fixing belt; the location portion, location portion with two at least one movably connection in the installation department, so that two the installation department can be close to or keep away from.

The single battery protection device has the advantages that the multiple fixing pieces are adopted, the position relation between the multiple fixing pieces and the center line of the single battery is limited, the area with small expansion of the single battery can be restrained, the area with large expansion of the single battery can be avoided, and the problem that the expansion of the single battery is excessively extruded in the using process to influence the service life is avoided. According to the battery module, excessive fixing parts are not needed, and the expansion force of each region of each single battery in the battery module can be ensured to be in a proper interval through the reasonable arrangement of the positions of the fixing parts, so that the overall service life of the battery module is prolonged. In addition, after the battery module recycles for a long time, the pole piece inside that the part that is fixed by the mounting corresponds on the battery cell can not cause the inside lithium of analyzing of electric core because excessively extrudeing, can promote the security performance.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model.

Fig. 1 shows a battery of the prior art;

fig. 2 is a schematic view illustrating an angle structure of a battery module according to an embodiment of the present invention;

fig. 3 is a structural view illustrating yet another angle of a battery module according to an embodiment of the present invention;

fig. 4 is a structural view illustrating yet another angle of a battery module according to an embodiment of the present invention;

fig. 5 is a structural view illustrating yet another angle of a battery module according to an embodiment of the present invention;

fig. 6 is a schematic swelling diagram of the unit cells of the battery module according to the embodiment of the present invention.

Reference numerals

A battery module 100;

a single battery 10; a first end 11; a second end 12; a middle portion 13; an upper portion 14; a lower portion 15;

a fixing member 20; a first fixing portion 21; a second fixed portion 22; a fixing band 23; an adjusting member 24; a mounting portion 25; a positioning portion 26;

end plate 30

A centre line a.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The present invention was invented by the inventors based on the following facts.

Fig. 1 shows a battery of the prior art.

The battery comprises a battery core, an end plate and a binding belt, wherein the battery core is provided with an upper shoulder part and a lower shoulder part, the binding belt tightly binds the battery core and the end plate, the distance between the top end of a pole group and the upper shoulder part is Xmm, the distance between the bottom end of the pole group and the lower shoulder part is Ymm, the distance between the binding belt and the upper shoulder part is Xmm +/-5 mm and/or the distance between the binding belt and the lower shoulder part is Ymm +/-5 mm.

The above battery has the following drawbacks: firstly, the battery core expands in the using process, particularly the expansion force of the middle area of the battery is large, so that after the battery core expands, the place bound by the binding belt is excessively extruded, lithium is separated from the interior of the battery core, and the service life and the safety performance of the battery are influenced; secondly, the middle part of the battery core is subjected to large extrusion force, the upper part and the lower part are subjected to small extrusion force, the stress is unbalanced, and the performance and the service life of the battery are influenced; thirdly, the battery can be divided into large batteries and small batteries according to the size, the height of some small batteries can be smaller than 5mm, the ribbon cannot be arranged under the condition, the height of some large batteries can be larger, and the ribbon is overlarge in size and wastes resources due to the fact that +/-5 mm is limited.

Based on this, the inventors of the present invention have conducted long-term studies and experiments to creatively develop the following inventions.

The battery module 100 according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 2 to 5, a battery module 100 according to an embodiment of the present invention includes a plurality of unit batteries 10 and a plurality of fixing members 20.

Specifically, a plurality of single batteries 10 are arranged side by side along the thickness direction of the single batteries 10, each single battery 10 includes a body and a pole in the height direction along the single battery 10, the body has a first end 11 and a second end 12 in the height direction, the first end 11 is arranged opposite to the second end 12, and the distance between the first end 11 and the second end 12 is h. One of the plurality of fasteners 20 is located on one side of the center line of the body in the height direction and is close to the first end 11, another one of the plurality of fasteners 20 is located on the other side of the center line of the body in the height direction and is close to the second end 12, each fastener 20 is arranged on the outer periphery of the plurality of single batteries 10 in the thickness direction, the width of the fastener 20 close to the first end 11 in the height direction is L1, and L1 is more than or equal to 0.15h and less than or equal to 0.35 h. The width of the fixing piece close to the second end 12 in the height direction is L2, and L2 is more than or equal to 0.15h and less than or equal to 0.35 h.

In other words, the battery module 100 according to the embodiment of the utility model is mainly composed of a plurality of single batteries 10 and a plurality of fixing members 20, and the plurality of single batteries 10 can constitute a single battery pack. Each single battery 10 has a height direction and a thickness direction, the single battery 10 includes a body and a pole along the height direction of the single battery 10, the body has a first end 11 and a second end 12 which are oppositely arranged in the height direction, and the first end 11 and the second end 12 can be respectively located at two sides of the center line a by taking the center line a of the height direction of the body as a reference line, namely, the first end 11 is located at one side of the center line a, and the second end 12 is located at the other side of the center line a. For example, the first end 11 is located above the centerline a and the second end 12 is located below the centerline a. After the fixing member 20 is sleeved on the periphery of the single battery pack along the thickness direction of the single battery 10, the width of the fixing member 20 is the size along the height direction of the single battery 10, and the length of the fixing member 20 is the size around the single battery pack along the thickness direction of the single battery 10. For convenience of description, the height of the unit cell 10 is defined as h, the width of the fixing member 20 is defined as L, and L and h satisfy the relation: l is more than or equal to 0.15h and less than or equal to 0.35h, and when L and h meet the relational expression, a certain area is reserved in the height direction of the single battery 10 to be used by an area with a larger expansion degree on the single battery pack, for example, the middle part 13 of the single battery 10.

For example, the height direction of the unit cells 10 is the up-down direction, the thickness direction is the left-right direction, and when a plurality of unit cells 10 are arranged side by side in the left-right direction, the region of the body above the height direction center line a thereof may be referred to as an upper portion 14, the region below may be referred to as a lower portion 15, and the lower portion 15 and the upper portion 14 have a middle portion 13 therebetween, i.e., the first end 11 may be the upper end, and the second end 12 may be the lower end. The height of the unit cell 10 in the up-down direction is h, i.e., the distance from the second end 12 to the first end 11 is h.

In order to improve the fixing effect for different positions on the unit cell 10, the number of the fixing members 20 may be plural, and the plural fixing members 20 may be divided into a first fixing portion 21 and a second fixing portion 22 according to a positional relationship with the center line a in the height direction, wherein the first fixing portion 21 may be located above the center line a, and the second fixing portion 22 may be located below the center line a. The number of the first fixing portions 21 may be one or more, and the number of the second fixing portions 22 may also be one or more.

The first fixing portions 21 and the second fixing portions 22 are spaced apart in the height direction, that is, are offset in the height direction, and a region (the middle portion 13) near the height direction center line a can be a blank region, that is, the middle portion 13 is not provided with the corresponding fixing member 20. As shown in fig. 6, since the expansion degree of the single battery 10 is generally the middle position of the body, i.e. the position close to the center line a in the height direction, when the single battery is expanded, i.e. the battery is expanded during the use of the battery, especially the expansion force of the middle part 13 area of the battery is large, in this embodiment, by respectively arranging the first fixing part 21 and the second fixing part 22 at the two sides of the center line a in the height direction, not only the middle part 13 of the body 0 can be prevented from being excessively pressed by the fixing part 20, but also the situation that the upper part 14 and the lower part 15 of the body are unevenly stressed can be prevented to a large extent.

In addition, both the width L1 of the first fastening portion 21 and the width L2 of the second fastening portion 22 are in the range of 0.15h L0.35 h. By adopting the width within this range, it can be ensured that the first fixing portion 21 and the second fixing portion 22 are both in the proper positions of the single battery 10, and it can be ensured that the middle portion 13 of the single battery 10 having a large degree of expansion is not excessively pressed.

Therefore, according to the battery module 100 of the embodiment of the utility model, the plurality of fixing pieces 20 are adopted, and the position relationship between the plurality of fixing pieces 20 and the center lines of the single batteries is limited, so that not only can the region with small expansion of the single batteries be restrained, but also the region with large expansion of the single batteries can be avoided, and the influence on the service life of the single batteries due to the fact that the expansion of the single batteries is excessively extruded in the using process is avoided. The battery module 100 of the utility model does not need excessive fixing parts, and can ensure that the expansion force of each region of each single battery 10 in the battery module 100 is in a proper interval through the reasonable arrangement of the position of the fixing piece 20, thereby prolonging the whole service life of the battery module 100. In addition, after the battery module 100 is recycled for a long time, the lithium precipitation inside the single battery 10 due to the excessive extrusion of the internal pole piece corresponding to the part fixed by the fixing member 20 on the single battery 10 is avoided, and the safety performance can be improved.

According to an embodiment of the present invention, the battery module 100 further includes a bracket coupled to the second end 12 for fixing the second end 12. That is, the second end 12 may be secured by a bracket. For example, the bracket is a tray, and when the battery module 100 is assembled, the second end 12 may be mounted on the tray by using an adhesive or other structures, and at this time, the second ends 12 of the plurality of single batteries 10 have a certain clamping force.

In some embodiments of the present invention, the width L2 of the second fastening portion 22 is smaller than the width L1 of the first fastening portion 21, L2 < L1. While the second end 12 of the single battery 10 has a certain clamping force, the number of relevant parts of the first end 11 of the single battery 10 is small, and the wider first fixing portion 21 is more beneficial to fastening the battery module.

In some embodiments of the present invention, the tensile strength of the fixing member 20 near the second end 12 is less than that of the fixing member 20 near the first end 11, i.e., the tensile strength of the second fixing portion 22 is less than that of the first fixing portion 21. That is, since the second ends 12 of the single batteries 10 have a certain clamping force, the first ends 11 of the single batteries 10 are usually not fixed or fixed loosely, and the first fixing parts 21 with a higher tensile strength are used, so that the deformation of the whole battery module 100 can be effectively prevented.

In some embodiments of the present invention, as shown in fig. 5, the distance between the fastening member 20 near the first end 11 and the first end 11 is h1, the distance between the fastening member 20 near the second end 12 and the second end 12 is h2, and h1 and h2 are both less than 0.5h, i.e. the distance between the first fastening portion 21 and the first end 11 is h1, the distance between the second fastening portion 22 and the second end 12 is h2, and the distances between h1 and h2 are both less than 0.5 h. That is, by defining the positional relationship between the first fixing part 20 and the first end 11 and the positional relationship between the second fixing part 22 and the second end 12, the middle part 13 with a large degree of expansion of the single battery 10 can be ensured not to be subjected to an excessive restraining force of the fixing part 20, the excessive compression of the pole piece inside the single battery 10 can be reduced, and the service life of the battery module 100 can be prolonged.

According to one embodiment of the utility model, 0.1h ≦ h2 ≦ 0.35 h. When h2 is greater than 0.35h, the degree of expansion of the position of the unit battery 10 corresponding to the second fixing portion 22 is large, the pressing force applied to the unit battery 10 is also increased, and the lithium deposition phenomenon at the position of the unit battery 10 fixed by the second fixing portion 22 is significantly increased, resulting in a shortened life of the battery module 100. When h2 is less than 0.1h, although the degree of deformation of the unit cell 10 at the position corresponding to the second fixing portion 22 is small, a superior fixing effect is not achieved.

Alternatively, 0.15h ≦ h2 ≦ 0.25 h. The expansion deformation degree of the region corresponding to the second fixing portion 22 on the battery module is not large, the second fixing portion 22 does not have too large extrusion of acting force to the battery, and meanwhile, the second fixing portion 22 at the position avoids the region with relatively large expansion degree corresponding to the middle and upper portions of the single battery 10.

In some embodiments of the present invention, as shown in fig. 2, the battery module 100 further includes end plates 30, and the end plates 30 are disposed at both sides of the plurality of unit batteries 10 in the thickness direction, for example, at both left and right sides of the unit battery pack. The end plate 30 is disposed on one side of the fixing member 20 close to the plurality of unit batteries 10 or on one side of the fixing member 20 away from the plurality of unit batteries 10, that is, the end plate 30 is disposed on one side of the fixing member 20 close to the unit battery pack or on one side of the fixing member 20 away from the unit battery pack. The end plate 30 may further clamp the unit cell stack in the thickness direction.

According to one embodiment of the present invention, as shown in fig. 2 and 3, the fixing member 20 includes a fixing band 23 and an adjusting member 24, wherein the fixing band 23 is a ring-shaped member and is disposed around the plurality of unit batteries 10 in a thickness direction of the plurality of unit batteries 10, that is, around the unit battery pack. The adjusting member 24 is connected with the fixing band 23 for adjusting the inner diameter of the ring-shaped member.

For example, the fixing band 23 is surrounded at both ends in its length direction by a channel which can be used to accommodate the unit battery pack, and an adjusting member 24 is connected to both ends of the fixing band 23 for adjusting the radial dimension of the channel. That is, by the adjustment of the adjustment member 24, not only the tightening degree for the unit battery pack can be controlled, but also it is applicable to different numbers of the unit batteries 10, and the installation and the removal of the fixing member 20 and the unit batteries 10 are facilitated.

In some embodiments of the present invention, as shown in fig. 2 and 3, the fixing strap is an elongated member, the adjusting member 24 includes two mounting portions 25 and two positioning portions 26, the two mounting portions 25 correspond to two ends of the fixing strap 23 along the length direction thereof, respectively, and the positioning portion 26 is movably connected to at least one of the two mounting portions 25, so that the two mounting portions 25 can move closer to or farther away from each other.

For example, each mounting portion 25 has a mounting hole, and the positioning portion 26 passes through two mounting holes in sequence, and is screwed with the inner wall surface of the mounting hole. The positioning part 26 may be a screw, and the space between the two mounting parts 25 can be controlled by the screw, so as to control the size of the radial dimension of the channel.

In summary, according to the battery module 100 of the embodiment of the present invention, the fixing member 20 is disposed, so that the unit battery pack formed by the plurality of unit batteries 10 can be fastened and fixed, and the battery module 100 has the advantages of simple structure, no need of adding additional components, good fixing effect, prolonging the service life of the battery module 100, preventing lithium deposition inside the unit batteries, and the like. The battery module 100 of the embodiment of the utility model can be used in the technical field of vehicles and the like requiring power supplies, and is not described herein again.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications can be made to the above embodiments without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.

Claims (10)

1. A battery module, comprising:

the single batteries are arranged side by side along the thickness direction of the single batteries, each single battery comprises a body and a pole along the height direction of the single battery, the body is provided with a first end and a second end along the height direction, the first end and the second end are arranged oppositely, and the distance between the first end and the second end is h; and

a plurality of fixing members, one of which is located on one side of a center line of the body in a height direction and is close to the first end, and another of which is located on the other side of the center line of the body in the height direction and is close to the second end, each of the fixing members being provided on outer peripheries of the plurality of unit batteries in the thickness direction;

the width of the fixing piece close to the first end in the height direction is L1, and L1 is more than or equal to 0.15h and less than or equal to 0.35 h;

the width of the fixing piece close to the second end in the height direction is L2, and L2 is more than or equal to 0.15h and less than or equal to 0.35 h.

2. The battery module according to claim 1, further comprising:

a bracket connected with the second end for securing the second end.

3. The battery module according to claim 2, wherein L2 < L1.

4. The battery module according to claim 2, wherein the tensile strength of the fixing member near the second end is less than the tensile strength of the fixing member near the first end.

5. The battery module as set forth in claim 1, wherein the securing member near the first end is spaced apart from the first end by h1, the securing member near the second end is spaced apart from the second end by h2, and h1 and h2 are each less than 0.5 h.

6. The battery module as recited in claim 5, wherein 0.1h 2 h 0.35 h.

7. The battery module as recited in claim 6, wherein 0.15h 2 h 0.25 h.

8. The battery module according to claim 1, further comprising:

the end plate, the end plate is located the both sides of a plurality of battery cells's thickness direction, the end plate is located the mounting is close to one side of a plurality of battery cells or locate the mounting is kept away from one side of a plurality of battery cells.

9. The battery module according to claim 1, wherein the fixing member comprises:

the fixing band is a ring-shaped member and is sleeved on the peripheries of the single batteries along the thickness direction of the single batteries;

an adjusting member connected with the fixing band for adjusting an inner diameter of the ring-shaped member.

10. The battery module according to claim 9, wherein the fixing band is an elongated member, and the adjuster comprises:

the two mounting parts are respectively in one-to-one correspondence with two ends of the fixing belt along the length direction of the fixing belt;

the location portion, location portion with two at least one movably connection in the installation department, so that two the installation department can be close to or keep away from.

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