Battery pack

Abstract

The utility model relates to the technical field of battery packs, and discloses a battery pack, which comprises a shell, a battery cell, a busbar, a PCM (Pulse Code Modulation) and an elastic conducting piece, the battery cell, the busbar, the PCM and the elastic conducting piece are arranged in the shell, the busbar and the PCM are correspondingly positioned at two ends in a first direction in the shell, and the busbar is connected with one electrode output end of the battery cell. One end of the elastic conduction piece is connected to the PCM in the first direction and right faces one side of the battery cell, and the other end of the elastic conduction piece abuts against the other electrode output end of the battery cell. According to the utility model, one end of the elastic conduction piece is welded on the PCM, and the other end of the elastic conduction piece is propped against the end part of the battery cell, so that the electric connection between the battery cell and the PCM is realized, and compared with the mode that a top end busbar is welded between the battery cell and the PCM to realize connection in the prior art, the welding connection between the battery cell and the PCM does not need to be manually carried out; the assembly process flow of the battery pack can be simplified, so that the production cost is saved, and the productivity can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a battery pack. Background Art

[0002] At present, conventional battery packs mainly include a shell, cylindrical battery cells, a top PCM, a top bus and a bottom bus all located inside the shell, the bottom bus is welded to the bottom of the battery cell, one end of the top bus is welded to the top of the battery cell, and the other end of the top bus is welded to the top PCM.

[0003] Therefore, during the assembly process of a conventional battery pack, the conduction between the battery cell and the top PCM requires welding a top bus bar between the two. The assembly process is too complicated and the cost is relatively high, which is not conducive to improving production capacity. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pack to simplify the process flow during assembly, save production costs, and improve production capacity.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A battery pack comprises a shell, a battery cell, a bus bar, a PCM, and an elastic conductive member all arranged in the shell, wherein the bus bar and the PCM are correspondingly located at two ends of the shell in a first direction, the bus bar is connected to an electrode output end of the battery cell, one end of the elastic conductive member is connected to a side of the PCM in the first direction and facing the battery cell, and the other end of the elastic conductive member is abutted against another electrode output end of the battery cell.

[0007] Preferably, the elastic conductive member includes a first connecting piece, a second connecting piece and a compression spring, the first connecting piece and the second connecting piece are fixed to two ends of the compression spring respectively, the first connecting piece is connected to the PCM, and the second connecting piece abuts against the electrode output end of the battery cell.

[0008] Preferably, a limiting rib is disposed on the inner wall of the shell, and the limiting rib abuts against one end of the battery cell facing the PCM to limit the battery cell from moving toward the PCM.

[0009] Preferably, a first buckle is provided on the inner wall of the shell, a first bayonet is provided on the PCM, and the first buckle is buckled on the first bayonet.

[0010] Preferably, a positioning column is provided on the inner wall of the housing on one side in the first direction and close to the PCM, and a positioning hole for the positioning column to fit into is opened on the PCM along the first direction.

[0011] Preferably, the positioning column is welded to the PCM to fix the PCM and the housing together.

[0012] Preferably, a flexible support member is provided between the inner wall of the housing on one side in the first direction and close to the busbar and the busbar.

[0013] Preferably, the shell includes a bottom shell and a top shell arranged along a first direction, both ends of the bottom shell and the top shell facing each other are opened, the top shell cover is arranged at the opening of the bottom shell, the battery cell and the bus are arranged in the bottom shell, and the PCM and the elastic conductive member are arranged in the top shell.

[0014] Preferably, an embedding groove is circumferentially provided on the side wall of the top shell facing one end of the bottom shell, a second snap-in is provided on the side wall of the embedding groove, an embedding panel is circumferentially provided on the side wall of the bottom shell facing one end of the top shell, a second buckle is provided on the side of the embedding panel, the embedding panel extends into the embedding groove, and the second buckle is buckled on the second snap-in.

[0015] Preferably, the embedding groove is filled with a fixing glue layer.

[0016] Compared with the prior art, the battery pack of the present utility model has the following beneficial effects:

[0017] In the utility model, one end of the elastic conductive member is welded to the PCM, and the other end thereof is abutted against one electrode output end of the battery cell, thereby realizing electrical connection between the battery cell and the PCM. Compared with the method of welding the top bus between the battery cell and the PCM to realize connection in the prior art, the battery cell and the PCM of the present application do not need to be manually welded to each other, which can simplify the assembly process of the battery pack, thereby saving production costs and improving production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the overall structure of an embodiment of the utility model;

[0019] Figure 2 It is an exploded view of the overall structure of an embodiment of the utility model;

[0020] Figure 3 It is an exploded view of the elastic conductive member of the embodiment of the utility model;

[0021] Figure 4 It is a schematic diagram of the internal structure of the top shell of an embodiment of the utility model;

[0022] Figure 5 It is a structural schematic diagram of the bottom shell of an embodiment of the utility model;

[0023] Figure 6 It is a full cross-sectional view of one embodiment of the utility model;

[0024] Figure 7 It is another full cross-sectional view of an embodiment of the utility model.

[0025] In the figure, 1, shell; 11, bottom shell; 111, embedded enclosure; 112, second buckle; 12, top shell; 121, embedded groove; 122, second bayonet; 123, limiting rib; 124, first buckle; 125, positioning column; 2, battery cell; 3, bus; 4, PCM; 41, avoidance; 42, first bayonet; 43, positioning hole; 5, elastic conductive part; 51, first connecting piece; 52, second connecting piece; 53, compression spring; 6, first foam; 7, second foam. DETAILED DESCRIPTION

[0026] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of the present utility model, it should be understood that the wording "comprising" used in the present utility model specification refers to the presence of the features, integers, steps, operations, parts / components and / or assemblies, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts / components, assemblies and / or their groups. It should be understood that when we say that a part / component is "connected" to another part / component, it can be directly connected to the other part / component, or there can be intermediate parts / components. The wording "and / or" used here includes all or any unit and all combinations of one or more associated listed items.

[0028] like Figures 1 to 7 As shown, the utility model relates to a battery pack, comprising a shell 1, a battery cell 2, a bus 3, a PCM 4 and an elastic conductive member 5, all of which are arranged in the shell 1, the bus 3 and the PCM 4 are correspondingly located at two ends of the inside of the shell 1 in a first direction, the bus 3 is connected to an electrode output end of the battery cell 2, one end of the elastic conductive member 5 is connected to a side of the PCM 4 in the first direction and facing the battery cell 2, and the other end of the elastic conductive member 5 is abutted against the other electrode output end of the battery cell 2.

[0029] In the utility model, one end of the elastic conductive member 5 is welded to the PCM4, and the other end thereof is abutted against one electrode output terminal of the battery cell 2, thereby realizing electrical connection between the battery cell 2 and the PCM4. Compared with the method of welding the top bus between the battery cell 2 and the PCM4 in the prior art to realize connection, the battery cell 2 and the PCM4 of the present application do not need to be manually welded to each other, which can simplify the assembly process of the battery pack, thereby saving production costs and improving production capacity.

[0030] In this embodiment, the shell 1 includes a bottom shell 11 and a top shell 12 arranged along a first direction, and both ends of the bottom shell 11 and the top shell 12 facing each other are opened, and the top shell 12 covers the opening of the bottom shell 11, the battery cell 2 and the bus 3 are both arranged in the bottom shell 11, and the PCM4 and the elastic conductive member 5 are arranged in the top shell 12.

[0031] By dividing the shell 1 into a bottom shell 11 and a top shell 12, and separately installing the battery cell 2, bus bar 3, PCM 4, elastic conductive member 5 and other components in the bottom shell 11 and the top shell 12, it is not necessary for production personnel to assemble the various components in the shell 1 in a specific order when assembling the battery pack, which is convenient for production personnel to assemble the battery pack. At the same time, after the components are assembled in the bottom shell 11 and the top shell 12, the top shell 12 is covered on the opening of the bottom shell 11, so that the battery cell 2 and PCM 4 can be connected through the elastic conductive member 5.

[0032] Preferably, an embedding groove 121 is circumferentially provided on the side wall of the top shell 12 facing the end of the bottom shell 11, and a plurality of second snap-fits 122 are circumferentially provided on the side wall of the embedding groove 121; an embedding panel 111 is circumferentially provided on the end of the side wall of the bottom shell 11 facing the top shell 12, and a plurality of second snap-fits 112 are circumferentially provided on the side of the embedding panel 111; the embedding panel 111 extends into the embedding groove 121, and a plurality of second snap-fits 112 are buckled on the plurality of second snap-fits 122 one by one.

[0033] By extending the embedded enclosure 111 into the embedded groove 121 and then buckling the second buckle 112 with the second snap-in 122, the stability of the connection between the bottom shell 11 and the top shell 12 can be strengthened, so that when the battery pack falls, the bottom shell 11 and the top shell 12 are not easy to separate, and the practicality is better.

[0034] Furthermore, the embedding groove 121 is filled with a fixed glue layer, that is, before the bottom shell 11 and the top shell 12 are buckled together, glue is applied in the embedding groove 121 of the top shell 12, and then the embedding panel 111 of the bottom shell 11 is allowed to enter the embedding groove 121, thereby further strengthening the stability of the connection between the top shell 12 and the bottom shell 11.

[0035] In this embodiment, the elastic conductive member 5 includes a first connecting piece 51, a second connecting piece 52 and a compression spring 53. The first connecting piece 51 and the second connecting piece 52 are fixed to the two ends of the compression spring 53 respectively. The first connecting piece 51 is welded to the PCM4, and the second connecting piece 52 is abutted against the electrode output end of the battery cell 2.

[0036] By setting the first connecting piece 51, it is ensured that there is a sufficient contact area with the PCM4, so that the production personnel can weld the first connecting piece 51 on the PCM4 conveniently, and the stability between the first connecting piece 51 and the PCM4 can be enhanced; by setting the second connecting piece 52, the contact area with the electrode output end of the battery cell 2 can be increased, so that it can stably abut against the electrode output end of the battery cell 2; by fixing the compression spring 53 between the first connecting piece 51 and the second connecting piece 52, the elastic thrust can be continuously applied to the first connecting piece 51 and the second connecting piece 52, so as to ensure the stability of the electrical connection between the battery cell 2 and the PCM4.

[0037] In this embodiment, the inner wall of the top shell 12 is provided with a plurality of limiting ribs 123 along the circumferential direction, and the plurality of limiting ribs 123 are located between the PCM4 and the battery cell 2, and the limiting ribs 123 abut against one end of the battery cell 2 toward the PCM4 to limit the movement of the battery cell 2 toward the PCM4, thereby preventing the battery cell 2 from colliding with the PCM4 and causing damage to the PCM4 and a short circuit; at the same time, through the provision of the limiting ribs 123, compared with the prior art, the present application does not need to provide foam between the battery cell 2 and the PCM4 for protection, thereby reducing the assembly process and also reducing the material cost.

[0038] Specifically, the PCM 4 is provided with an escape opening 41 in a region corresponding to the limiting rib 123 , so that the PCM 4 can pass through the limiting rib 123 and be installed in the top shell 12 .

[0039] Preferably, a first buckle 124 is provided on the inner wall of the top shell 12 on one side in the first direction and close to the PCM4, and a first bayonet 42 is opened on the PCM4 in an area corresponding to the first buckle 124, and the first buckle 124 is buckled on the first bayonet 42, so that the PCM4 can be installed in the top shell 12.

[0040] Furthermore, a positioning column 125 is provided on the inner wall of the top shell 12 on one side in the first direction and close to the PCM 4 , and a positioning hole 43 for the positioning column 125 to fit into is opened on the PCM 4 along the first direction.

[0041] By providing the positioning column 125 and the positioning hole 43 , the PCM 4 can be positioned and installed in the top shell 12 , thereby facilitating the installation of the PCM 4 and facilitating the improvement of production capacity.

[0042] Furthermore, the positioning column 125 is welded to the PCM 4 to fix the PCM 4 and the housing 1 together.

[0043] That is, after the positioning column 125 passes through the positioning hole 43 of the PCM4, the positioning column 125 is melted by a melting process to allow the positioning column 125 to be welded to the PCM4, and the PCM4 is fixed again after solidification, so that the stability between the PCM4 and the top shell 12 is better. Moreover, compared with the method of fixing the PCM4 by screwing in the prior art, the design of the battery pack of the present application does not need to consider the space for the screwdriver to enter, which reduces the difficulty of the battery pack design. At the same time, it also avoids the risk of the screws easily falling into the battery pack and causing the product to short-circuit during the screwing process, and also avoids the problem of the screws falling into the battery pack and being difficult to remove.

[0044] In this embodiment, a flexible support member is provided between the inner wall of the housing 1 on one side in the first direction and close to the bus bar 3 and the bus bar 3 .

[0045] The flexible support member is a first foam 6, which plays a role of buffer protection between the bottom shell 11 and the battery cell 2, thereby preventing rigid impact and damage between the bottom shell 11 and the battery cell 2. The flexible support member can also be a sponge pad, a rubber pad or a silicone pad.

[0046] In this embodiment, two battery cells 2 are provided, and the two battery cells 2 are arranged side by side in the bottom shell 11. The bus 3 is provided between the two ends of the battery cells 2 in the first direction and away from the PCM 4. Two elastic conductive members 5 are provided on the PCM 4, and the two elastic conductive members 5 are in one-to-one contact with the two battery cells 2. A second foam 7 is provided between the two battery cells 2, thereby playing a buffering and protective role between the two battery cells 2.

[0047] In summary, compared with the prior art, the battery pack of the present application has the following technical effects:

[0048] 1. The battery cell and PCM are connected by elastic conductive parts to reduce the assembly process, thereby reducing production costs and increasing production capacity;

[0049] 2. The limiting ribs are used to limit the movement of the battery cells toward the PCM to prevent the battery cells from hitting the PCM, thus protecting the PCM.

[0050] 3. The PCM and the top shell are connected by a first buckle and a first bayonet, and a positioning column is arranged on the inner wall of the top shell to pass through the positioning hole of the PCM and is welded to the PCM, so as to fix the PCM in a double fixing manner to ensure the stability of the PCM in the top shell. At the same time, this fixing method is simpler and more convenient, so as to make the battery pack assembly process operation simpler and safer.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A battery pack, It is characterized in that The invention comprises a shell, a battery cell, a bus bar, a PCM and an elastic conductive member all arranged in the shell, wherein the bus bar and the PCM are correspondingly located at two ends of the shell in a first direction, the bus bar is connected to an electrode output end of the battery cell, one end of the elastic conductive member is connected to a side of the PCM in the first direction and facing the battery cell, and the other end of the elastic conductive member is abutted against another electrode output end of the battery cell.

2. The battery pack according to claim 1, It is characterized in that The elastic conductive member includes a first connecting piece, a second connecting piece and a compression spring, the first connecting piece and the second connecting piece are fixed to two ends of the compression spring respectively, the first connecting piece is connected to the PCM, and the second connecting piece abuts against the electrode output end of the battery cell.

3. The battery pack according to claim 1, It is characterized in that The inner wall of the shell is provided with a limiting rib, and the limiting rib abuts against one end of the battery core facing the PCM to limit the battery core from moving toward the PCM.

4. The battery pack according to claim 1, It is characterized in that The inner wall of the shell is provided with a first buckle, the PCM is provided with a first bayonet, and the first buckle is buckled on the first bayonet.

5. The battery pack according to claim 1, It is characterized in that A positioning column is provided on the inner wall of the housing on one side in the first direction and close to the PCM, and a positioning hole for the positioning column to fit into is opened on the PCM along the first direction.

6. The battery pack according to claim 5, It is characterized in that The positioning column is fused to the PCM to fix the PCM and the shell together.

7. The battery pack according to claim 1, It is characterized in that A flexible support member is provided between the inner wall of the housing on one side in the first direction and close to the bus bar and the bus bar.

8. The battery pack according to claim 1, It is characterized in that The shell includes a bottom shell and a top shell arranged along a first direction, both ends of the bottom shell and the top shell facing each other are opened, the top shell cover is arranged at the opening of the bottom shell, the battery cell and the bus bar are arranged in the bottom shell, and the PCM and the elastic conductive member are arranged in the top shell.

9. The battery pack according to claim 8, It is characterized in that An embedding groove is circumferentially provided on the side wall of the top shell facing one end of the bottom shell, a second snap-in is provided on the side wall of the embedding groove, an embedding panel is circumferentially provided on the side wall of the bottom shell facing one end of the top shell, a second buckle is provided on the side of the embedding panel, the embedding panel extends into the embedding groove, and the second buckle is buckled on the second snap-in.

10. The battery pack according to claim 9, It is characterized in that The embedding groove is filled with a fixing glue layer.

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