CN220382282U - Battery module - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a battery module which comprises a plurality of electric cores, polar posts and aluminum bars; the device also comprises a limit bulge and a limit groove; the limiting protrusion is arranged on the outer side wall of the pole or the aluminum bar; the limiting groove is arranged on the outer side wall of the aluminum bar or the polar column; the limiting protrusion can be in snap connection with the limiting groove and prevent the aluminum bar from being far away from the pole. The battery module can solve the problems that the welding is long in time consumption, low in production efficiency and high in labor and hardware consumption cost due to the fact that the aluminum bars and the poles of the existing battery module are connected by welding.

Description

Battery module

Technical Field

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

Background

The battery module generally comprises a plurality of battery cells arranged side by side, wherein each battery cell is provided with positive and negative poles, and the positive and negative poles on each battery cell are connected with each other in sequence by using aluminum bars when the module is formed, so that each battery cell is connected in series to form a whole; the existing connection mode of the aluminum bars and the poles is often designed to be welded, the welding process is complex, the welding time is long, and therefore the forming time of the battery module is long, and the production efficiency of the battery module is low; meanwhile, the aluminum bars and the pole columns are connected by welding, so that operators are required to be correspondingly trained and corresponding equipment is used, and the manpower resource and hardware cost of the production line are increased.

Disclosure of Invention

The utility model aims at: the problems of long welding time, low production efficiency and high labor and hardware consumption cost of the existing battery module are solved by adopting welding connection of the aluminum bars and the pole posts.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

a battery module comprises a plurality of battery cells, a pole and aluminum bars; the device also comprises a limit bulge and a limit groove; the limiting protrusion is arranged on the outer side wall of the pole or the aluminum bar; the limiting groove is arranged on the outer side wall of the aluminum bar or the polar column; the limiting protrusion can be in snap connection with the limiting groove and prevent the aluminum bar from being far away from the pole.

When the limiting bulge is arranged on the outer side wall of the pole, a corresponding limiting groove is arranged on the aluminum bar; when the limiting groove is formed in the outer side wall of the pole, a corresponding limiting protrusion is arranged on the aluminum bar.

For the connection of a single pole and an aluminum bar, one or more limit grooves can be adopted; the limiting groove is required to play a limiting role on the limiting protrusion, for example, when the limiting groove is arranged on the pole, the distance between one end of the limiting groove, which is close to the aluminum bar, and the corresponding end of the pole is greater than zero, so that one end of the second groove, which is close to the aluminum bar, is not opened, and the limiting protrusion is prevented from being separated from the second groove in the direction away from the pole. The design of the limit protrusion can refer to the prior art, such as the design of a cantilever type buckle.

According to the scheme, the limiting groove or the limiting bulge is additionally arranged on the side wall of the pole, and the corresponding limiting bulge or the corresponding limiting groove is arranged on the aluminum bar, so that the connection between the aluminum bar and the pole can be realized through the bayonet connection of the limiting bulge and the limiting groove, the axial displacement of the aluminum bar relative to the pole along the pole is limited, and the aluminum bar is prevented from being separated from the pole in the direction away from the pole; compared with the existing battery module with the aluminum bars and the poles connected by welding, the scheme can avoid welding operation, so that the assembly time of the battery module is shortened, and the assembly speed of the battery module is improved; meanwhile, the scheme can also avoid corresponding welding equipment and welding personnel, so that equipment and manpower resource cost of a battery module assembly line are reduced.

As a preferable scheme of the utility model, the limit groove further comprises a first groove and a second groove; an end of the first groove close to the aluminum bar is opened; the second groove is connected to one side of the first groove along the circumferential direction of the pole; the limit protrusion can enter the second groove through one end of the opening of the first groove.

One or more second grooves may be distributed along the axial direction of the pole; the angle occupied by the second groove along the circumferential direction of the pole is determined according to actual requirements, and if the requirement of limiting along the circumferential direction of the pole is not met, the second groove can be manufactured into a complete circular groove; the spacing protruding one end that can follow the first groove open gets into the second groove, if the width of first groove along utmost point post circumference is greater than spacing protruding width in corresponding direction.

The second groove is connected to one side of the first groove along the circumferential direction of the pole, for example, when the number of the second grooves is one, the first groove and the second groove can be combined into a limiting groove similar to an L shape; when the number of the second grooves is two, the first grooves and the second grooves can be combined into limiting grooves similar to an inverted F shape; therefore, when the limit protrusion enters the first groove, the limit protrusion can enter the second groove by rotating the pole and the aluminum bar relatively.

According to the scheme, the aluminum bar and the polar column are connected, so that the aluminum bar rotates relative to the polar column, the direction of the rotational freedom degree of the polar column relative to the aluminum bar is selected when the shape of the limiting groove is designed, and the situation that the corresponding direction cannot be rotated due to interference of parts when the aluminum bar is installed is avoided.

The limiting groove specifically comprises a first groove and a second groove, wherein the first groove is close to an opening at one end of the aluminum bar, the limiting protrusion can enter the first groove from the opening of the first groove, and then the limiting protrusion enters the second groove by rotating the aluminum bar; compared with other structures, such as a cantilever type buckle type structure, the scheme does not need the limit protrusion to have elasticity, so that the limit protrusion is beneficial to being designed into a structure with higher strength; simultaneously, the limit groove of this scheme can strengthen the restriction to the rotation degree of freedom of aluminium bar along utmost point post circumference to make the connection of this scheme aluminium bar and utmost point post more firm reliable, can resist abominable vibration environment more.

As a preferred embodiment of the present utility model, a joint between the second groove and the first groove is chamfered.

The specific size of the chamfer is determined according to the specific situation of the limit groove; the chamfer can be a round angle or a bevel angle.

The action that this scheme can get into the second groove for horizontal arch is led to make the installation of aluminium bar more smooth and easy, accelerate the installation rate of aluminium bar.

As a preferable aspect of the present utility model, the second groove has a larger dimension in the circumferential direction of the pole than in the axial direction of the pole.

The scheme can increase the superposition area of the projection of the limit groove and the limit bulge on the plane vertical to the axis of the pole, thereby enhancing the limit effect of the limit groove on the limit bulge along the axis direction of the pole and ensuring that the connection between the aluminum bar and the pole is more reliable; and meanwhile, the distance required by the limit protrusion to exit the second groove is increased, so that the limit protrusion is more difficult to accidentally exit from the second groove due to external influence.

As a preferable scheme of the utility model, the number of the limit grooves or limit protrusions on the single pole is N; n is more than 1; the limit grooves or limit protrusions are symmetrically arranged relative to the center of the axis of the pole.

According to the scheme, the connection effect of the aluminum bars and the poles is further enhanced by increasing the number of the limiting grooves, so that the probability that the aluminum bars are separated from the poles is reduced.

As a preferable mode of the present utility model, the length of each second groove along the circumferential direction of the pole is L; the radius of the pole is R; NL/r=pi.

Because the size of the transverse bulge corresponds to the size of the second groove, and the size of the first groove corresponds to the size of the limit bulge, if the length of a single second groove along the circumferential direction of the pole is L, the corresponding length of the first groove along the circumferential direction of the pole is also L, and the total length of N second grooves and the corresponding first groove along the circumferential direction of the pole is 2NL, namely 2 pi R, so that the whole circumference of the pole is fully utilized in the scheme to arrange the second grooves, and the connecting effect of aluminum bars and the pole is maximized.

As a preferable scheme of the utility model, the number of the limit grooves or limit protrusions on the single pole is two.

The proposal recommends that the number of the limiting grooves is two, and the aluminum bar and the pole are more reliably connected compared with the scheme with one number, and meanwhile, the limiting grooves and the limiting protrusions can be simplified compared with the scheme with higher number, so that the manufacturing cost and the working time of the aluminum bar and the pole are reduced.

As a preferable scheme of the utility model, the battery cells are arranged side by side; and the positive electrode post and the negative electrode post of the adjacent two battery cores are respectively positioned on the same side.

In this scheme, the orientation of two adjacent electric cores is opposite to make among each electric core that sets up side by side, the positive pole post of preceding electric core is located the same side of battery module with the negative pole post of following electric core, and the negative pole post of preceding electric core is located the same side of battery module with the positive pole post of following electric core simultaneously, thereby shortens the distance of the positive pole post of preceding electric core and the negative pole post of following electric core, or shortens the distance of the negative pole post of preceding electric core and the positive pole post of following electric core, thereby can reduce required aluminium bar's length, reduce the material consumption and the cost of manufacturing aluminium bar.

As a preferable scheme of the utility model, when the limit groove further comprises the first groove and the second groove, the pole posts of two adjacent electric cores are in mirror image structures.

The polar posts of two adjacent electric cores are in mirror image structures, and the rotation freedom degree direction of the positive polar post of the previous electric core relative to the aluminum bar is clockwise, and the rotation freedom degree of the negative polar post of the next electric core relative to the aluminum bar is anticlockwise; correspondingly, the two corresponding limit protrusions on the aluminum bar are also in mirror image structures.

The limiting groove comprises a first groove and a second groove, so that when the pole and the aluminum bar are connected, the battery cell and the aluminum bar need to be rotated relatively; in actual production, when the next cell is connected in series with the previous cell, a mounting mode of rotating the cell is generally adopted; meanwhile, in the battery module, because the two adjacent electric cores face opposite directions, the serial loop of each electric core is in a snake shape, so that the direction of the rotation freedom degree of the electric core relative to the aluminum bar is required to be changed continuously and alternately in order to avoid interference with the last electric core when the next electric core rotates; therefore, the scheme recommends that the pole posts of two adjacent electric cores are made into the shapes of mirror images, so that the directions of the rotation degrees of freedom of the electric cores relative to the aluminum bars are alternately changed, and the installation difficulty caused by mutual interference between the electric cores when the electric cores are rotated relative to the aluminum bars is avoided.

As a preferred embodiment of the present utility model, the dimension of the second groove in the axial direction of the pole is at least two millimeters.

The second groove and the transverse bulge are recommended to the scheme along the axial dimension of the pole, so that the transverse bulge can be ensured to be along the axial strength of the pole, and the connection between the aluminum bar and the pole is ensured to be reliable.

As a preferred embodiment of the present utility model, the second groove has an end portion near the aluminum bar, which end portion corresponds to the pole, at least two millimeters.

According to the scheme, the distance between the end, close to the aluminum bar, of the second groove and the end corresponding to the pole is recommended, the enough strength of one side, corresponding to the second groove, can be ensured, so that the second groove is prevented from being broken through by the transverse bulge under the external load and is separated from the second groove, and the connection reliability of the aluminum bar and the pole is ensured.

As a preferred embodiment of the present utility model, the dimensions of the second groove and the lateral protrusion in the radial direction of the pole are at least two millimeters.

The radial size of second groove and horizontal protruding along the utmost point post has been recommended to this scheme, can reduce the probability that horizontal protruding breaks away from in the second groove to ensure that horizontal protruding has sufficient intensity, thereby ensure that aluminium bar and the connection of utmost point post are reliable.

In summary, due to the adoption of the technical scheme, the beneficial effects of the utility model are as follows:

1. according to the scheme, the limiting groove or the limiting bulge is additionally arranged on the side wall of the pole, and the corresponding limiting bulge or the corresponding limiting groove is arranged on the aluminum bar, so that the connection between the aluminum bar and the pole can be realized through the bayonet connection of the limiting bulge and the limiting groove, the axial displacement of the aluminum bar relative to the pole along the pole is limited, and the aluminum bar is prevented from being separated from the pole in the direction away from the pole; compared with the existing battery module with the aluminum bars and the poles connected by welding, the scheme can avoid welding operation, so that the assembly time of the battery module is shortened, and the assembly speed of the battery module is improved; meanwhile, the scheme can also avoid corresponding welding equipment and welding personnel, so that equipment and manpower resource cost of a battery module assembly line are reduced.

Drawings

Fig. 1 is a schematic perspective view of a battery module according to the present utility model;

fig. 2 is a schematic perspective view of a battery module according to the present utility model;

FIG. 3 is a schematic perspective view of an aluminum bar;

FIG. 4 is a schematic front view of an aluminum bar;

FIG. 5 is a schematic perspective view of a pole;

FIG. 6 is a partial side view schematic of a monolithic cell;

FIG. 7 is a schematic partial front view of two adjacent cells;

icon: 1-an electric core; 2-pole; 3-aluminum bar; 21-a limit groove; 211-a second groove; 212-a first groove; 31-limit protrusions; 32-a lateral protrusion; 33-longitudinal protrusions; 4-conductive blocks.

Detailed Description

The present utility model will be described in detail with reference to the accompanying drawings.

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Example 1

As shown in fig. 1 to 7, a battery module adopted in the present embodiment includes a plurality of battery cells 1, and the poles 2 of two adjacent battery cells 1 are connected by an aluminum bar 3; the outer side wall of the pole 2 is provided with a limit groove 21; the limit groove 21 comprises a second groove 211 arranged along the circumferential direction of the pole 2; the distance between the end of the second groove 211, which is close to the aluminum bar 3 and the end corresponding to the pole 2 is greater than zero; the aluminum bar 3 is provided with a limiting protrusion 31; the limit projection 31 includes a lateral projection 32 corresponding to the second groove 211; the transverse protrusion 32 is connected in the limit groove 21.

Specifically, each cell 1 is arranged side by side, and the positive electrode post 2 of the previous cell 1 and the negative electrode post 2 of the next cell 1 are positioned on the same side; the negative electrode post 2 of the previous cell 1 and the positive electrode post 2 of the next cell 1 are positioned on the same side; for the present embodiment, as shown in fig. 1 to 2, the number of the battery cells 1 is four, and each battery cell 1 is provided with one electrode post 2 at the positive electrode and the negative electrode thereof, wherein the electrode posts of the positive electrode are the positions i, iii, v, vii in fig. 2, respectively; the poles of the negative electrode are respectively at II, IV, VI and VIII in figure 2; the left side of the leftmost cell 1 and the right side of the rightmost cell 1 in fig. 2 are respectively provided with a conductive block 4 for fixing the connection part of the aluminum row; each cell 1 is connected in series with each other through an aluminum bar 3 connected to a pole 2 thereof; the specific connection mode is shown in fig. 2, wherein I is connected with a left conductive block 4 through an aluminum bar 3, II is connected with III through the aluminum bar 3, IV is connected with V through the aluminum bar 3, VI is connected with VII through the aluminum bar 3, and VIII is connected with a right conductive block 4 through the aluminum bar 3.

As shown in fig. 5 to 7, the limit groove 21 further includes a first groove 212 disposed along the axial direction of the pole 2; the first groove 212 communicates with the second groove 211; the first slot 212 is open at one end near the aluminium bar 3; the limit projection 31 can enter the limit groove 21 from one end of the first groove 212 which is open; rotation of the aluminium bar 3 after the stop projection 31 enters the stop slot 21 enables the transverse projection 32 to enter the second slot 211. For the present embodiment, the first groove 212 and the second groove 211 are combined in an L shape; correspondingly, as shown in fig. 3 to 4, the limiting protrusion 31 further includes a longitudinal protrusion 33, the longitudinal protrusion 33 and the transverse protrusion 32 are combined into an L shape, and the dimension of the longitudinal protrusion 33 along the axial direction of the pole 2 corresponds to the dimension of the first groove 212, so that after the limiting groove 21 is inserted, the transverse protrusion 32 can be aligned with the second groove 211, and thus the transverse protrusion 32 can be inserted into the second groove 211 by rotating the aluminum bar 3 or the battery cell 1.

The number of limit grooves 21 on the single pole 2 is more than one; the limiting grooves 21 are arranged symmetrically relative to the center of the axis of the pole 2; and the number of limit grooves 21 on the single pole 2 is N; the length of the single second groove 211 along the circumferential direction of the pole 2 is L; the radius of the pole 2 is R; NL/r=pi; specifically, the number of the limiting grooves 21 on the single pole 2 in the present embodiment is two, and the length of the single second groove 211 on each pole 2 along the circumferential direction of the pole 2 is 1/2 pi R; correspondingly, the length of the first groove 212 along the circumferential direction of the pole 2 and the length of the limiting protrusion 31 along the circumferential direction of the pole 2 are 1/2 pi R.

As shown in fig. 5 to 7, the communication between the first groove 212 and the second groove 211 is chamfered; the end of the first groove 212 near the aluminium bar 3 is also chamfered, so that the limit projection 31 enters the first groove 212 and the transverse projection 32 enters the second groove 211.

As shown in fig. 6 and 7, the poles 2 of two adjacent cells 1 are mirror images; specifically, as shown in fig. 2, when looking at the pole 2 from the aluminum bar 3, the rotational freedom direction of the aluminum bar 3 at ii is clockwise, and the rotational freedom direction of the aluminum bar 3 at iii is counterclockwise; so that the rotation freedom degree direction of the battery cell 1 at the position II relative to the aluminum bar 3 is anticlockwise, and the rotation freedom degree of the battery cell 1 at the position III relative to the aluminum bar 3 is clockwise, and when the battery cell 1 needs to be rotated so that the transverse protrusions 32 enter the second grooves 211, the rotation directions of the battery cells 1 respectively positioned at the two sides of the aluminum bar 3 can be ensured to face between the two battery cells 1, and interference between the two adjacent battery cells 1 is avoided; when the battery cell 1 connected to the position III is installed, the rotation direction of the battery cell 1 is clockwise, so that the battery cell 1 connected to the position II cannot interfere; the limit grooves 21 of the pole 2 at other positions are arranged in the same way.

In the embodiment, when the aluminum bar 3 and the pole 2 are installed in the module forming stage, the limiting protrusions 31 are inserted into the first grooves 212 of the corresponding limiting grooves 21, and then the aluminum bar 3 or the battery cell 1 is selectively rotated according to specific conditions so as to insert the transverse protrusions 32 into the second grooves 211; if the aluminum bar 3 is required to be mounted on the pole 2 of the fixed battery cell 1, the aluminum bar 3 can be selected; when a new cell 1 needs to be connected in series to the fixed aluminium bar 3, the cell 1 can be selected to be rotated.

Example 2

On the basis of embodiment 1, the dimensions of the second groove 211 and the lateral protrusion 32 in the axial direction of the pole 2 are at least two millimeters, the end of the second groove 211, which is close to the end of the aluminum bar 3 and corresponds to the pole 2, is at least two millimeters, and the dimensions of the second groove 211 and the lateral protrusion 32 in the radial direction of the pole 2 are at least two millimeters.

The present embodiment can ensure that the limit projection 31 and the limit groove 21 have sufficient strength and sufficient limit capability, respectively, so that the connection of the aluminum bar 3 and the pole 2 is reliable.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. A battery module comprises a plurality of battery cells (1), a pole (2) and an aluminum bar (3); the device is characterized by further comprising a limiting protrusion (31) and a limiting groove (21); the limiting protrusion (31) is arranged on the outer side wall of the pole (2) or the aluminum bar (3); the limiting groove (21) is arranged on the outer side wall of the aluminum bar (3) or the polar column (2); the limiting protrusion (31) can be in snap connection with the limiting groove (21) and prevent the aluminum bar (3) from being far away from the pole (2).

2. The battery module according to claim 1, wherein the limiting groove (21) further comprises a first groove (212) and a second groove (211); -an end of the first slot (212) close to the aluminium bar (3) is open; the second groove (211) is connected to one side of the first groove (212) along the circumferential direction of the pole (2); the limit projection (31) can enter the second groove (211) through one end of the opening of the first groove (212).

3. A battery module according to claim 2, wherein the second groove (211) has a larger dimension in the circumferential direction of the pole (2) than in the axial direction of the pole (2).

4. A battery module according to claim 2, wherein the number of the limit grooves (21) or limit protrusions (31) on the individual poles (2) is N; n is more than 1; the limiting grooves (21) or the limiting protrusions (31) are arranged symmetrically relative to the center of the axis of the pole (2).

5. A battery module according to claim 4, wherein the length of each of the second grooves (211) in the circumferential direction of the pole (2) is L; the radius of the pole (2) is R; the circumference ratio is pi;

NL/R＝Π。

6. a battery module according to claim 5, wherein the number of the limit grooves (21) or limit protrusions (31) on the single pole (2) is two.

7. A battery module according to any one of claims 2 to 6, wherein the cells (1) are arranged side by side; the positive electrode pole (2) and the negative electrode pole (2) of the adjacent two battery cores (1) are respectively positioned on the same side.

8. The battery module according to claim 7, wherein when the limiting groove (21) further comprises the first groove (212) and the second groove (211), the poles (2) of two adjacent electric cores (1) are in mirror image structures.

9. A battery module according to any one of claims 2 to 5, wherein the dimension of the second groove (211) in the axial direction of the pole (2) is at least two millimeters.

10. A battery module according to any one of claims 2 to 5, wherein the end of the second groove (211) adjacent to the aluminium bar (3) is at least two mm from the end corresponding to the pole (2).