CN219979780U

CN219979780U - Battery module and battery pack

Info

Publication number: CN219979780U
Application number: CN202321697149.0U
Authority: CN
Inventors: 李芝岳; 陆云; 曹伦; 刘晨南
Original assignee: Ningxia Baofeng Yuneng Technology Co Ltd
Current assignee: Ningxia Baofeng Yuneng Technology Co Ltd
Priority date: 2023-06-30
Filing date: 2023-06-30
Publication date: 2023-11-07
Anticipated expiration: 2033-06-30

Abstract

The utility model discloses a battery module and a battery pack. The battery module comprises a module body and a bus bar assembly, wherein the module body comprises a module fixing bolt; the busbar assembly comprises a busbar body, an electric busbar and an electrode busbar, wherein the opposite ends of the busbar body are respectively provided with a leading-out terminal, and one side of the leading-out terminal, which is close to the module fixing bolt, is provided with a flange part; the electrode busbar is provided with an electrode lead-out part arranged on the lead-out terminal; the electric bus is connected to the electrode leading-out part in a bonding way, and the flange part is used for increasing the electric gap distance between the bonding connection part of the electric bus and the electrode leading-out part and the module fixing bolt, so that the electric gap can reach a required distance value, and the flashover phenomenon is eliminated. After the battery pack is formed by installing the battery module in the battery pack box, the possibility of arc discharge in an electric gap can be reduced, and risks such as faults of the battery pack are reduced, so that the use safety and the service life of the battery pack are improved.

Description

Battery module and battery pack

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a battery module and a battery pack.

Background

When the battery module is assembled in the battery box and the positive (negative) electrode aluminum bar is connected with the positive (negative) electrode bus bar of the battery module, the situation that the electric gap between the connecting position of the positive (negative) electrode aluminum bar and the positive (negative) electrode bus bar of the battery module and the module fixing bolt is close but does not meet the distance condition can be met, and the flashover phenomenon can occur when the situation occurs, so that the safety problem can be caused for the battery module.

At present, in the prior art, taking the positive aluminum bar as an example, the technical scheme adopted for solving the flashover phenomenon is to wrap the connection part of the positive aluminum bar and the positive bus bar of the battery module by using an insulating adhesive tape, or to additionally install insulating protection pieces such as an insulating shield on a non-insulating part, and the flashover phenomenon is avoided by improving the insulating property and blocking the path of arc discharge. However, the problem with the above technical solution is that if the insulating tape or the insulating protection member is omitted during the assembly process, or the situation such as falling occurs during the subsequent use process of the battery module, the "flashover" will occur again, so there is a great potential safety hazard.

Based on the foregoing, there is a need for a battery module and a battery pack to solve the technical problems in the prior art.

Disclosure of Invention

The first object of the utility model is to provide a battery module, which aims to solve the problem that the electric gap between the connection parts of the positive and negative electrode aluminum bars and the positive and negative electrode bus bars of the battery module and the module fixing bolts does not meet the distance condition requirement, and eliminate the occurrence of the flashover phenomenon.

To achieve the purpose, the utility model adopts the following technical scheme:

a battery module, comprising: module body and busbar subassembly, the module body includes module fixing bolt, the busbar subassembly lay in the module body has one side of electric core utmost point post, the busbar subassembly includes busbar body, wire harness and electrode busbar, wherein:

the bus bar comprises a bus bar body, wherein the opposite ends of the bus bar body are respectively provided with a leading-out terminal, and one side, close to the module fixing bolt, of the leading-out terminal is provided with a flange part;

the electrode bus is provided with an electrode lead-out part which is arranged on the lead-out terminal;

the wire bus is connected to the electrode lead-out portion in a bonding mode, and the flange portion is used for increasing the electric gap distance between the bonding connection position of the wire bus and the electrode lead-out portion and the module fixing bolt.

Alternatively, the flange portion is provided to extend in a direction away from the module fixing bolt, and an extending direction of the flange portion is parallel to an axial direction of the module fixing bolt.

Optionally, the flange portion is extended in a direction approaching the module fixing bolt, and an extending direction of the flange portion is perpendicular to an axial direction of the module fixing bolt.

Optionally, the electrode busbar is further provided with a fixed mounting part integrally formed with the electrode lead-out part, a riveting column is fixedly arranged on one of the fixed mounting part and the busbar body, a riveting hole is formed in the other of the fixed mounting part and the busbar body, and the riveting column is limited and inserted into the riveting hole, so that the fixed mounting part is in riveting connection with the busbar body.

Optionally, the rivet is made of ABS material.

Optionally, the busbar assembly further includes a plurality of intermediate busbars, and the plurality of intermediate busbars are riveted with the busbar body.

Optionally, the cross sections of the fixed installation part and the middle bus bar are square, the opposite angles of the fixed installation part and the middle bus bar are respectively provided with one riveting hole, and the bus bar body is provided with the riveting column corresponding to the riveting hole.

Optionally, the battery module includes two module bodies arranged in parallel, and each module body includes a plurality of stacked battery cell bodies;

the electric bus comprises a first conductive bus, a second conductive bus and a third conductive bus, wherein the first conductive bus is arranged on one of the module body and is electrically connected with the other one of the module body and the other one of the module body, and the third conductive bus is arranged on the other one of the module body and the other one of the module body.

Optionally, one of the first conductive bus bar and the third conductive bus bar is in an L-shaped structure and comprises a vertical portion and a horizontal portion, one end, far away from the horizontal portion, of the vertical portion is attached to the electrode lead-out portion, along the direction in which the battery cells are stacked, and the projection, on the plane, of one end, far away from the vertical portion, of the horizontal portion is covered on the adjacent partial projection, on the plane, of the module body.

The second purpose of the utility model is to provide a battery pack, which aims to solve the problem that the electric gap between the connection parts of the positive and negative electrode aluminum bars and the positive and negative electrode bus bars of the battery module and the module fixing bolts does not meet the distance condition requirement, eliminate the occurrence of the flashover phenomenon, improve the use safety of the battery pack and prolong the service life of the battery pack.

the battery pack comprises a battery pack box and the battery module, wherein the battery module is positioned in the battery pack box.

Compared with the prior art, the utility model has the beneficial effects that:

according to the battery module provided by the utility model, the flange part is arranged on the leading-out terminal of the busbar body and close to one side of the module fixing bolt, so that after the electric busbar is connected to the electrode leading-out part in a bonding mode, the electric gap between the bonding connection part between the electric busbar and the electrode leading-out part and the module fixing bolt can be effectively increased, the electric gap can reach a required distance value, and the flashover phenomenon is eliminated. After the battery pack is formed by installing the battery module in the battery pack box, the possibility of arc discharge in an electric gap can be reduced, and risks such as faults of the battery pack are reduced, so that the use safety and the service life of the battery pack are improved.

Drawings

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

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a top view of a battery module provided by the present utility model;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;

FIG. 5 is an enlarged view of a portion of FIG. 4 at C;

fig. 6 is a front view of the battery module provided by the present utility model.

In the figure:

1. a module body; 11. a battery cell; 12. an end plate; 13. a steel strip; 14. a module fixing bolt;

2. a busbar assembly; 20. riveting a column; 21. a busbar body; 211. a lead-out terminal; 2111. a flange portion; 22. an electrical bus; 221. a first conductive bus bar; 222. a second conductive bus bar; 223. a third conductive bus bar; 2231. a horizontal portion; 2301. an electrode lead-out portion; 2302. a fixed mounting part; 231. a positive bus bar; 24. an intermediate bus.

Detailed Description

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to be within the scope of the present utility model.

As shown in fig. 1 to 6, the present embodiment provides a battery module including a module body 1 and a bus bar assembly 2. The module body 1 comprises a plurality of stacked battery cells 11, the battery cells 11 at the front end and the rear end are respectively provided with an end plate 12, the battery cells 11 are clamped and shaped through the end plates 12, then the end plates 12 and the battery cells 11 are bound and fixed through steel belts 13, and finally a plurality of module fixing bolts 14 vertically penetrate through each end plate 12, so that the module body 1 can be fixedly arranged through the module fixing bolts 14, and shaking of the module body 1 is prevented. The busbar assembly 2 is paved on one side of the module body 1 with the battery cell electrode column, and comprises a busbar body 21, an electric busbar 22 and an electrode busbar 23, wherein the opposite ends of the busbar body 21 are respectively provided with an outgoing terminal 211, and one side of the outgoing terminal 211, which is close to the module fixing bolt 14, is provided with a flange portion 2111; the electrode bus bar 23 has an electrode lead-out portion 2301, the electrode lead-out portion 2301 being provided on the lead-out terminal 211; the electrical bus 22 is bonded to the electrode lead 2301.

Further, as shown in fig. 5, in the present embodiment, the flange portion 2111 is extended in a direction away from the module fixing bolt 14, and the extending direction of the flange portion 2111 is parallel to the axial direction of the module fixing bolt 14, so that the distance between the fitting connection between the busbar 22 and the electrode lead-out portion 2301 and the module fixing bolt 14 is the sum of the length values of the line a and the line b in fig. 5. When the flange portion 2111 is not provided, the distance between the fitting connection between the busbar 22 and the electrode lead-out portion 2301 and the module fixing bolt 14 is the sum of the length values of the line h and the line g in fig. 5. In this way, by providing the flange portion 2111 on the lead-out terminal 211 of the busbar body 21 and on the side close to the module fixing bolt 14, after the electrical busbar 22 is attached to the electrode lead-out portion 2301, the electrical gap between the attaching connection portion between the electrical busbar 22 and the electrode lead-out portion 2301 and the module fixing bolt 14 can be effectively increased, so that the electrical gap can reach a desired distance value, and the occurrence of the "flashover" phenomenon can be eliminated.

It should be noted that, in some other embodiments, the flange portion 2111 may also be extended along the direction approaching to the module fixing bolt 14, and the extending direction of the flange portion 2111 is perpendicular to the axial direction of the module fixing bolt 14, so that the distance between the fitting connection between the bus bar 22 and the electrode lead-out portion 2301 and the module fixing bolt 14 may be increased, thereby providing more choices for designing and manufacturing the bus bar body 21. Therefore, the extending direction of the flange portion 2111 is not limited, and it is within the scope of the present utility model as long as the distance between the bonding connection between the electric bus 22 and the electrode lead portion 2301 and the module fixing bolt 14 can be increased.

Specifically, in the present embodiment, the lead-out terminal 211 includes a positive lead-out terminal and a negative lead-out terminal, and the above-described flange portions 2111 are provided on both sides of the positive lead-out terminal and the negative lead-out terminal near the module fixing bolt 14; the electrode buss bar 23 includes a positive electrode buss bar 231 and a negative electrode buss bar, and the positive electrode buss bar 231 and the negative electrode buss bar are provided on the positive electrode lead-out terminal and the negative electrode lead-out terminal, respectively, through one electrode lead-out portion 2301; the electric bus 22 includes a positive electrode aluminum bar and a negative electrode aluminum bar, the positive electrode aluminum bar is attached to the electrode lead-out portion 2301 of the positive electrode bus 231, and the negative electrode aluminum bar is attached to the electrode lead-out portion 2301 of the negative electrode bus. Through the above arrangement, the distances between the attaching connection parts between the bus bars 22 at the opposite ends of the bus bar body 21 and the electrode lead-out parts 2301 and the module fixing bolts 14 are increased, so that the safety and reliability of the battery module in use are further improved.

Specifically, referring to fig. 2, the electrode buss 23 has a fixed mounting portion 2302 integrally formed with an electrode lead-out portion 2301, one of the fixed mounting portion 2302 and the buss body 21 is fixedly provided with a rivet 20, and the other of the fixed mounting portion 2302 and the buss body 21 is provided with a rivet hole so that the fixed mounting portion 2302 is rivet-connected with the buss body 21. In this embodiment, the rivet 20 is disposed on the busbar body 21, the rivet 20 may be fixedly disposed on the busbar body 21 by riveting, that is, a position suitable for mounting the rivet 20 may be reserved on the busbar body 21, then a drill is used to drill a hole in the busbar body 21, then the rivet 20 is inserted into the hole, and finally the rivet 20 is fixed on the busbar body 21 by a riveting tool. In addition, taking the positive electrode busbar 231 as an example, the above-mentioned fixing portion 2302 is provided on the positive electrode busbar 231, and a caulking hole (not shown) corresponding to the rivet 20 is provided on the fixing portion 2302, and the positive electrode busbar 231 is caulking-connected to the busbar body 21 by fitting the rivet 20 with the caulking hole.

Since the current main flow mode of connecting the battery core pole with the busbar body 21 is realized by laser welding, the positive electrode busbar 231 and the busbar body 21 are mostly fixed by a buckle connection mode, but when a robot manipulator of an automatic production line grabs the busbar assembly 2, the positive electrode busbar 231 is easy to fall off from the busbar body 21, so that the working efficiency is influenced; in addition, the positive electrode bus bar 231 and the bus bar body 21 are fixed by means of snap connection, and only the mounting operation can be performed manually, so that mass production cannot be performed. In this embodiment, the positive electrode busbar 231 and the busbar body 21 are connected and fixed by riveting, so that automatic mass production can be performed, and the connection stability between the positive electrode busbar 231 and the busbar body can be improved, thereby improving the yield and being beneficial to saving the cost.

Preferably, in this embodiment, the rivet 20 is made of ABS, which has good rigidity and strength, and strong plasticity. After the rivet 20 on the busbar body 21 is fitted with the rivet hole on the corresponding positive electrode busbar 231, the positive electrode busbar 231 is fixed to the busbar body 21 by using the thermoplastic property of the rivet 20. Of course, in other embodiments, the rivet 20 may be made of aluminum alloy, or heat-resistant plastic such as PEEK (polyetheretherketone), which is not limited in the present utility model.

It can be understood that, in this embodiment, the fixing portion 2302 is also provided on the negative bus bar, and the negative bus bar is also riveted to the bus bar body 21 through the fixing portion 2302 in the same manner as the positive bus bar 231, which is not described here in detail.

More specifically, as shown in fig. 3, the busbar assembly 2 provided in this embodiment further includes a plurality of intermediate busbars 24, and riveting holes are also formed in the intermediate busbars 24, and rivet posts 20 are correspondingly provided on the busbar body 21, so that the intermediate busbars 24 are also connected with the busbar body 21 by riveting, and thus the connection stability of the intermediate busbars 24, the positive electrode busbars 231 and the negative electrode busbars on the busbar body 21 can be greatly enhanced, not only the production efficiency is improved, but also the yield of the produced busbar assembly 2 can be further enhanced.

Further, as shown in fig. 2 and 3, the cross sections of the fixed mounting portion 2302 and the middle bus bar 24 are square, and a riveting hole is formed at the diagonal positions of the fixed mounting portion 2302 and the middle bus bar 24, respectively, and the rivet posts 20 corresponding to the riveting hole are formed on the bus bar body 21.

Optionally, in this embodiment, the battery module includes two module bodies 1 disposed in parallel, and each module body 1 includes a plurality of stacked battery cells 11; in addition, the electrical busbar 22 includes a first conductive busbar 221, a second conductive busbar 222 and a third conductive busbar 223, the first conductive busbar 221 is disposed on one of the outgoing terminals 211 on one of the module bodies 1, the second conductive busbar 222 is electrically connected to the other outgoing terminal 211 on the one of the module bodies 1 and the one outgoing terminal 211 on the other module body 1, and the third conductive busbar 223 is disposed on the other outgoing terminal 211 on the other module body 1. That is, when the first conductive bus bar 221 provided in the present embodiment is used as the positive aluminum bar on one of the module bodies 1, the second conductive bus bar 222 is used as an aggregate of the negative aluminum bar on one of the module bodies 1 and the positive aluminum bar on the other module body 1, so that the two module bodies 1 are connected in series, and the third conductive bus bar 223 is used as the negative aluminum bar on the other module body 1, the series connection of the two module bodies 1 can be realized by the combination of the three conductive bus bars 22, so as to form a larger circuit system, so that electric energy can be continuously transferred and transferred between the two modules, and higher electric power efficiency can be exerted.

Further, in this embodiment, as shown in fig. 1 and 6, the third conductive busbar 223 is in an L-shaped structure, and includes a vertical portion 2201 and a horizontal portion 2202, where one end of the vertical portion 2201, which is far away from the horizontal portion 2202, is attached to the electrode lead-out portion 2301, and along the direction in which the battery cells 11 are stacked, the projection of the one end of the horizontal portion 2202, which is far away from the vertical portion 2201, on the plane covers the partial projection of the adjacent module body 1 on the plane, so that the horizontal portion 2202 of the third conductive busbar 223 extends in the direction close to the first conductive busbar 221, and the design can make the setting position of the panel pole more flexible and free. Specifically, in this embodiment, the panel post is located at one side of one of the module bodies 1, and the horizontal portion 2202 of the third conductive bus bar 223 is extended toward the side, so that connection with the panel post is facilitated. Of course, the panel post may be located on one side of the other module body 1, and the first conductive bus bar 221 may be designed into an L-shaped structure, which includes the vertical portion 2201 and the horizontal portion 2202, and then the horizontal portion 2202 of the first conductive bus bar 221 is extended toward the direction of approaching the third conductive bus bar 223, so as to implement the panel post on one side of the other module body 1. Through the arrangement, different layout requirements of the panel polar posts can be met, so that the design flexibility of the circuit is improved.

The embodiment also provides a battery pack, which comprises a battery pack box and the battery module, wherein the battery module is positioned in the battery pack box so as to assemble and install the battery module. The battery module is provided with the flange portion 2111 on the leading-out terminal 211 of the busbar body 21 and near one side of the module fixing bolt 14, so that the electric gap between the attaching connection part between the busbar 22 and the electrode leading-out portion 2301 and the module fixing bolt 14 can be effectively increased, the electric gap can reach a required distance value, the generation of a flashover phenomenon is eliminated, the possibility of arc discharge in the electric gap can be reduced when the battery pack is in actual use, the risks of faults and the like of the battery pack are reduced, and the use safety and the service life of the battery pack are improved.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. The battery module, its characterized in that includes: module body (1) and busbar subassembly (2), module body (1) include module fixing bolt (14), busbar subassembly (2) shop in module body (1) have one side of electric core utmost point post, busbar subassembly (2) include busbar body (21), wire busbar (22) and electrode busbar (23), wherein:

the bus bar comprises a bus bar body (21), wherein two opposite ends of the bus bar body are respectively provided with a leading-out terminal (211), and one side, close to the module fixing bolt (14), of the leading-out terminal (211) is provided with a flange part (2111);

the electrode busbar (23) has an electrode lead-out portion (2301), and the electrode lead-out portion (2301) is provided on the lead-out terminal (211);

the wire busbar (22) is in fit connection with the electrode lead-out portion (2301), and the flange portion (2111) is used for increasing the electric gap distance between the fit connection position of the wire busbar (22) and the electrode lead-out portion (2301) and the module fixing bolt (14).

2. The battery module according to claim 1, wherein the flange portion (2111) is provided extending in a direction away from the module fixing bolt (14), and the extending direction of the flange portion (2111) is parallel to the axial direction of the module fixing bolt (14).

3. The battery module according to claim 1, wherein the flange portion (2111) is provided extending in a direction approaching the module fixing bolt (14), and the extending direction of the flange portion (2111) is perpendicular to the axial direction of the module fixing bolt (14).

4. A battery module according to any one of claims 1 to 3, wherein the electrode buss bar (23) further has a fixed mounting portion (2302) integrally formed with the electrode lead-out portion (2301), one of the fixed mounting portion (2302) and the buss bar body (21) is fixedly provided with a rivet (20), the other of the fixed mounting portion (2302) and the buss bar body (21) is provided with a rivet hole, and the rivet (20) is inserted into the rivet hole at a limit so that the fixed mounting portion (2302) is rivet-connected with the buss bar body (21).

5. The battery module according to claim 4, wherein the rivet (20) is made of ABS material.

6. The battery module according to claim 4, wherein the busbar assembly (2) further comprises a plurality of intermediate busbars (24), the plurality of intermediate busbars (24) being riveted with the busbar body (21).

7. The battery module according to claim 6, wherein the cross sections of the fixing portion (2302) and the intermediate bus bar (24) are square, the diagonal positions of the fixing portion (2302) and the intermediate bus bar (24) are respectively provided with one riveting hole, and the bus bar body (21) is provided with the riveting column (20) corresponding to the riveting hole.

8. The battery module according to claim 1, wherein the battery module comprises,

the battery module comprises two module bodies (1) which are arranged in parallel, wherein each module body (1) comprises a plurality of stacked battery cells (11);

the electric bus bar (22) comprises a first conductive bus bar (221), a second conductive bus bar (222) and a third conductive bus bar (223), wherein the first conductive bus bar (221) is arranged on one of the module bodies (1) and is electrically connected with the other one of the module bodies (1) and the other one of the module bodies (1), the second conductive bus bar (222) is electrically connected with the other one of the module bodies (211) and the other one of the module bodies (1), and the third conductive bus bar (223) is arranged on the other one of the module bodies (1) and is electrically connected with the other one of the module bodies (211).

9. The battery module according to claim 8, wherein one of the first conductive bus bar (221) and the third conductive bus bar (223) has an L-shaped structure, and includes a vertical portion (2201) and a horizontal portion (2202), wherein one end of the vertical portion (2201) away from the horizontal portion (2202) is attached to the electrode lead-out portion (2301), and along the stacking direction of the battery cells (11), the projection of the one end of the horizontal portion (2202) away from the vertical portion (2201) on a plane covers the partial projection of the adjacent module body (1) on the plane.

10. A battery pack comprising a battery pack case and the battery module according to any one of claims 1 to 9, the battery module being located in the battery pack case.