Battery module and battery pack

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery module and a battery pack. The battery module comprises: a housing having a first opening; the battery cell stacking body is mounted in the shell, and the tab side of the battery cell stacking body corresponds to the first opening; the rubber block is filled at the first opening to block the first opening and cover the tab side of the battery cell stack, and the outer side wall of the rubber block forms a part of the outer side wall of the battery module; and the output electrode busbar assembly is directly positioned and mounted on the shell and is electrically connected with the battery core stacking body, the rubber block covers one part of the output electrode busbar assembly, and the other part of the output electrode busbar assembly is exposed out of the rubber block and the shell so as to form an external electric connection part. According to the battery module and the battery pack, heat spreading can be prevented, the problem that the output electrode busbar assembly is difficult to position and install is solved, the number of parts is reduced, the space utilization rate is improved, and the cost can be reduced and the energy density of the battery module and the battery pack can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power batteries, and particularly relates to a battery module and a battery pack. Background Art

[0002] The battery module of the battery pack outputs external electric energy through an output pole busbar. The installation and fixation of the output pole busbar rely on a separate busbar bracket arranged in the battery module. However, the installation and fixation of the output pole busbar through the busbar bracket increase the number of components, occupy a large space, and are not conducive to reducing costs and improving the energy density of the battery pack. Summary of the Utility Model

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a battery module and a battery pack, which are used to solve the problems of complex structure of the battery module and difficult installation and fixation of the output pole busbar in the prior art, so as to simplify the structures of the battery module and the battery pack, improve the space utilization rate, reduce costs and improve the energy density.

[0004] To achieve the above purpose and other related purposes, the present utility model provides a battery module, including:

[0005] A housing having a first opening;

[0006] A stack of battery cells having a tab side, the stack of battery cells being installed in the housing, and the tab side of the stack of battery cells corresponding to the first opening;

[0007] A rubber block filling the first opening to block the first opening and covering the tab side of the stack of battery cells, and an outer side wall of the rubber block forming a part of an outer side wall of the battery module;

[0008] An output pole busbar assembly directly positioned and installed on the housing and electrically connected to the stack of battery cells, the rubber block covering a part of the output pole busbar assembly, and another part of the output pole busbar assembly being exposed outside the rubber block and the housing to be configured as an external electrical connection portion.

[0009] Optionally, the output pole busbar assembly includes an output pole busbar and an insulating member. The output pole busbar has an internal electrical connection portion electrically connected to the stack of battery cells and the external electrical connection portion, and the insulating member covers a fixing portion of the output pole busbar except for the internal electrical connection portion and the external electrical connection portion.

[0010] Optionally, the housing includes side plates, and the output pole busbar is positioned and installed on the side plates.

[0011] Optionally, an external nut is provided on the external electrical connection portion.

[0012] Optionally, the output terminal busbar is in a flat plate shape, is located inside the side plate, and is parallel and attached to the side plate.

[0013] Optionally, a positioning groove is provided on the inner side wall of the side plate, and at least part of the output terminal busbar is positioned and installed in the positioning groove.

[0014] Optionally, a second opening corresponding to the external electrical connection portion is provided on the side plate, and the external electrical connection portion is exposed from the second opening outside the rubber block and the housing.

[0015] Optionally, a part of the output terminal busbar is bent and extends toward the tab side of the battery cell stack to form the external electrical connection portion. A third opening corresponding to the external electrical connection portion is provided at the top of the rubber block, and the external electrical connection portion is exposed from the third opening outside the rubber block and the housing.

[0016] Optionally, the housing further includes a bottom plate and an upper cover. The bottom plate is connected to the two oppositely arranged side plates and cooperates with the upper cover to construct the housing having the first opening at both ends.

[0017] Optionally, the rubber block wraps a part of the output terminal busbar assembly and at least a part of the tabs of the battery cell stack.

[0018] Optionally, the rubber block includes foamed rubber.

[0019] Optionally, the insulating member includes an insulating film.

[0020] To achieve the above and other related purposes, the present application further provides a battery pack, including the battery module as described above.

[0021] As described above, the battery module and the battery pack of the present utility model have at least the following beneficial effects: The rubber block is filled at the opening of the housing. By blocking the opening with the rubber block and covering the tab side of the battery cell stack, it is possible to avoid setting additional components to block the opening, which is beneficial to cost reduction. Moreover, heat protection can be achieved through the rubber block to prevent heat spread. Based on this, the output terminal busbar assembly is directly positioned and installed on the housing and has an external electrical connection portion exposed outside the rubber block and the housing, which is convenient for external output, solves the problem of difficult positioning and installation of the output terminal busbar assembly, and there is no need to additionally set other components to provide positioning and installation support for the output terminal busbar, reducing the number of components, improving space utilization rate, and being beneficial to cost reduction and improving the energy density of the battery module and the battery pack. Description of the Drawings

[0022] Figure 1 Structural schematic diagram of the first embodiment of the battery module of the present utility model;

[0023] Figure 2 is Figure 1 partial explosion schematic diagram of the battery module in

[0024] Figure 3 is Figure 1 partial structural schematic diagram of the connection between the output pole busbar assembly and the side plate in

[0025] Figure 4 is Figure 1 partial explosion schematic diagram of the connection between the output pole busbar assembly and the side plate in

[0026] Figure 5 Structural schematic diagram of the second embodiment of the battery module of the present utility model;

[0027] Figure 6 is Figure 5 partial structural schematic diagram of the connection between the output pole busbar assembly and the side plate in

[0028] Figure 7 is Figure 5 partial explosion schematic diagram of the connection between the output pole busbar assembly and the side plate in

[0029] Part number description

[0030] Housing 1, upper cover 11, side plate 12, positioning groove 121, second opening 122, bottom plate 13, battery cell stack 2, rubber block 3, third opening 31, sampling assembly 4, output pole busbar assembly 5, output pole busbar 51, internal electrical connection part 511, external electrical connection part 512, insulating part 52, external nut 53, fastening bolt 61, fastening nut 62. Specific implementation mode

[0031] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0032] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the implementation conditions of this utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that this utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in this utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the implementation scope of this utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the implementable scope of this utility model.

[0033] See Figure 1 、 Figure 2 and Figure 5 , in some alternative embodiments, the present application provides a battery pack, and the battery pack includes a battery module.

[0034] See Figure 1 、 Figure 2 and Figure 5 , in some alternative embodiments, the battery module provided by the present application includes a housing 1, a battery cell stack 2, a rubber block 3, and an output pole busbar assembly 5; in addition to the above components, the battery module may further include a sampling component 4. The housing 1 has a first opening; the battery cell stack 2 has a tab side, the battery cell stack 2 is installed in the housing 1, and the tab side of the battery cell stack 2 corresponds to the first opening; the rubber block 3 is filled at the first opening to block the first opening and cover the tab side of the battery cell stack 2, and the outer side wall of the rubber block 3 forms a part of the outer side wall of the battery module; that is to say, there is no other structure outside the rubber block 3 to shield the rubber block 3, so that the rubber block 3 can act as the function and role of the end plate of a traditional battery module.

[0035] Furthermore, the output pole busbar assembly 5 is directly positioned and installed on the housing 1 and is electrically connected to the battery cell stack 2. The rubber block 3 covers a part of the output pole busbar assembly 5, and the other part of the output pole busbar assembly 5 is exposed outside the rubber block 3 and the housing 1 to be constructed as an external electrical connection part 512, and the external electrical connection part 512 is used for the external electrical connection of the battery cell stack 2 to realize the external output of the power of the battery cell stack 2 through the output pole busbar assembly 5.

[0036] Optionally, the rubber block 3 wraps a part of the output pole busbar assembly 5 and at least a part of the tabs of the battery cell stack 2. The rubber block 3 includes foamed rubber, which is simple, convenient, fast to fill, and has good insulation and heat insulation effects.

[0037] Optionally, the sampling component 4 is located inside the housing 1. The sampling component 4 can be directly positioned and installed on the housing 1 and is electrically connected to the battery cell stack 2. The electrical connection between the sampling component 4 and the battery cell stack 2 enables the acquisition of information such as the temperature and voltage of the battery cell stack 2. Among them, the battery cell stack 2 includes a plurality of stacked battery cells. The battery cells have tabs, and the tab side of the battery cell stack 2 and the tabs of the battery cells are on the same side. The sampling component 4 is electrically connected to the tabs of the battery cells. Further, the sampling component 4 includes a flexible circuit board and sampling elements. The flexible circuit board is electrically connected to the tabs of the battery cell stack 2 through the sampling elements, and the sampling elements are electrically connected to the tabs of the battery cells to acquire information of the battery cells; among them, the sampling elements include nickel sheets.

[0038] Optionally, the output terminal busbar assembly 5 includes an output terminal busbar 51 and an insulating member 52. The output terminal busbar 51 has an internal electrical connection portion 511 and an external electrical connection portion 512 that are electrically connected to the battery cell stack 2. The insulating member 52 covers the fixing portion of the output terminal busbar 51 except for the internal electrical connection portion 511 and the external electrical connection portion 512. The output terminal busbar 51 includes a copper bar or an aluminum bar. An external connection nut 53 is provided on the external electrical connection portion 512 for external electrical connection. The external connection nut 53 and the external electrical connection portion 512 can be fixedly installed by embedding, riveting or other fixing methods. Among them, the internal electrical connection portion 511 includes a tab welding area and a nickel sheet welding area. The tab welding area is welded and fixed to the tab of the battery cell, and the nickel sheet welding area is welded and fixed to the nickel sheet. Further, the insulating member 52 includes an insulating film. The insulating member 52 is made of an insulating material and has insulating properties. The insulating film can be thermally pressed and wrapped on the output terminal busbar 51.

[0039] Optionally, the housing 1 includes side plates 12, and the output terminal busbar 51 is positioned and installed on the side plates 12. The output terminal busbar 51 is adhesively fixed to the side plates 12 or connected and fixed through a fastening component. Among them, the fastening component includes screws, or the fastening component includes a fastening bolt 61 and a fastening nut 62. The fastening nut 62 is fixed on the side plate 12, and the bolt passes through the output terminal busbar 51 and is connected to the fastening nut 62 to fasten and connect the output terminal busbar assembly 5 to the side plate 12, with simple, convenient, and reliable connection. Further, the number of side plates 12 is two, and the two side plates 12 are arranged oppositely. The housing 1 further includes a bottom plate 13 and an upper cover 11. The bottom plate 13 is connected to the two oppositely arranged side plates 12 and cooperates with the upper cover 11 to construct a housing 1 with a first opening at both ends. Specifically, the bottom plate 13 is located between the two side plates 12, and both ends of the bottom plate 13 are respectively connected to the two side plates 12 to form a U-shaped structure with an opening facing the upper cover 11. This structural design eliminates the end plate for sealing the first opening, which is beneficial to simplifying the structure and reducing the weight. In this application, the distribution direction of the upper cover 11 and the bottom plate 13, the height direction of the side plates 12, the height direction of the rubber block 3, and the height direction of the battery module are the same, that is, the Z direction in the drawings; the length direction of the battery cell stack 2, the length direction of the battery cells, and the length direction of the side plates 12 are the same, that is, the X direction in the drawings. The output terminal busbar 51 is directly positioned and installed on the side plates 12, enabling the output terminal busbar assembly 5 to be integrated on the side plates 12, so that the output terminal busbar 51 and the side plates 12 can be installed together as a whole, with simple and convenient installation. It can be understood that the output terminal busbar 51 is not limited to being positioned and installed on the side plates 12, and can also be installed on other parts of the housing 1, such as the upper cover 11.

[0040] Optionally, the upper cover 11 is provided with a potting hole, and the foaming rubber can be poured into the housing 1 through the potting hole to form a rubber block 3 to seal the opening of the housing 1 and cover at least a part of the tab side of the battery cell stack 2. Further, the rubber block 3 wraps at least a part of the sampling assembly 4 and at least a part of the tabs 21 of the battery cell stack 2. When specifically setting, a tooling can be used to first seal the opening, and then pour the foaming rubber into the housing 1. After the foaming rubber foams and forms a stable rubber block structure and seals the opening, the tooling is removed, thereby completing the setting of the rubber block 3.

[0041] For the battery module of the above embodiments, the housing 1 has a first opening, and the opening is sealed and the tab side of the battery cell stack 2 is covered by the rubber block 3. The rubber block 3 is formed as a part of the outer wall of the battery module. Not only can an additional end plate be omitted to seal the first opening, which is beneficial to simplifying the structure and reducing the weight, but also the rubber block 3 has the functions of heat insulation and flame retardancy, which is beneficial to playing a protective role when the battery module undergoes thermal runaway and reducing the risk of thermal propagation. In addition, the output pole busbar assembly 5 is directly positioned and installed on the housing 1, and the housing 1 provides positioning support for the output pole busbar assembly 5. An additional busbar bracket can be omitted to realize the positioning and installation of the output pole busbar assembly 5, reducing the number of components and the overall weight, which is beneficial to reducing costs, improving space utilization rate and the energy density of the battery module. The output pole busbar assembly 5 has an external electrical connection portion 512 exposed outside the rubber block 3 and the housing 1 for the external electrical connection of the battery cell stack 2, so as to realize the external output of the power of the battery cell stack 2 and further realize the external output of the electric energy of the battery module.

[0042] See Figures 1 to 4 , in some alternative embodiments, the output pole busbar 51 is in a flat plate shape. The output pole busbar 51 is located inside the side plate 12 and is parallel and attached to the side plate 12. The structural layout is compact, which is beneficial to saving space and improving space utilization rate. Or rather, the extending direction of the output pole busbar 51 is the same as that of the side plate 12. Specifically, the height direction of the output pole busbar 51, the height direction of the side plate 12 and the height direction of the battery module are the same, that is, the Z direction in the drawings, and the length direction of the output pole busbar 51, the length direction of the side plate 12 and the length direction of the battery module are the same, that is, the X direction in the drawings.

[0043] Optionally, a positioning groove 121 is provided on the inner side wall of the side plate 12, and at least part of the output pole busbar 51 is positioned and installed in the positioning groove 121. The side plate 12 is thinned to provide space for the positioning and installation of the output pole busbar 51, which is beneficial to improving space utilization rate, and the positioning and installation operation of the output pole busbar 51 is simple and convenient.

[0044] Optionally, a second opening 122 corresponding to the external electrical connection portion 512 is provided on the side plate 12, and the external electrical connection portion 512 is exposed outside the rubber block 3 and the housing 1 from the second opening 122. Among them, the second opening 122 is provided in the positioning groove 121 and penetrates through the side plate 12 along the thickness direction of the side plate 12, and one end of the second opening 122 penetrates through one end face of the side plate 12 along the length direction of the side plate 12. In this application, the thickness direction of the side plate 12 is the same as the thickness direction of the output pole busbar 51, that is, the Y direction in the drawings.

[0045] Optionally, the external nut 53 can be at least partially embedded in the external electrical connection part 512 or protrude inside the external electrical connection part 512, and the inside of the external electrical connection part 512 is the side facing the battery cell stack 2.

[0046] For the battery module of the above embodiment, the structure of the output pole busbar 51 is simple, the layout is compact, and the occupied space is small, thereby reducing the overall space occupied by the output pole busbar assembly 5, and further improving the space utilization rate of the battery module, which is beneficial to improving the energy density of the battery module.

[0047] See Figures 5 to 7 , in some alternative embodiments, a part of the output pole busbar 51 is bent and extends toward the tab side of the battery cell stack 2 to form an external electrical connection part 512. A third opening 31 corresponding to the external electrical connection part 512 is provided at the top of the rubber block 3, and the external electrical connection part 512 is exposed from the third opening 31 outside the rubber block 3 and the housing 1.

[0048] Optionally, a fourth opening corresponding to the third opening 31 is provided on the upper cover 11, so that the output pole busbar 51 can be externally output from the top of the battery module, which is beneficial to reducing the space occupied by the battery module in its length direction.

[0049] Optionally, the external nut 53 is fixed on the external electrical connection part 512 and is located on the side of the external electrical connection part 512 facing away from the upper cover 11.

[0050] For the battery module of the above embodiment, the output pole busbar 51 is exposed from the third opening 31 on the rubber block 3, which is convenient for external connection and convenient for the external output of the battery cell stack 2, thus facilitating the external output of the battery module; and the third opening 31 is provided at the top of the rubber block 3, which is convenient for the output pole busbar 51 to be externally output from the top of the rubber block 3, that is to say, it is convenient for the output pole busbar 51 to be externally output along the height direction of the battery module, which is beneficial to reducing the space occupied by the battery module in the length direction.

[0051] For the battery module and battery pack of the present invention, the output pole busbar assembly 5 is fixed on the housing 1, and there is no need to additionally provide a busbar bracket to provide installation support for the output pole busbar assembly 5, which is beneficial to reducing the number of parts, reducing the weight, improving the space utilization rate, and improving the energy density of the battery module and battery pack.

[0052] In the description of this specification, the descriptions referring to terms such as "this embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0053] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not used to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A battery module, characterized in that: include: a housing having a first opening; A battery cell stack having a tab side, the battery cell stack being installed in the housing, and the tab side of the battery cell stack corresponding to the first opening; A rubber block, the rubber block is filled at the first opening to block the first opening and cover the pole ear side of the battery cell stack, and the outer side wall of the rubber block forms a part of the outer side wall of the battery module; An output pole bus bar assembly is directly positioned and mounted on the shell and electrically connected to the battery cell stack, the rubber block covers a portion of the output pole bus bar assembly, and another portion of the output pole bus bar assembly is exposed outside the rubber block and the shell to form an external electrical connection portion.

2. The battery module according to claim 1, characterized in that: The output pole busbar assembly includes an output pole busbar and an insulating member, wherein the output pole busbar has an internal electrical connection portion and an external electrical connection portion electrically connected to the battery cell stack, and the insulating member covers the fixed portion on the output pole busbar except the internal electrical connection portion and the external electrical connection portion.

3. The battery module according to claim 2, characterized in that: The shell includes a side plate, and the output pole busbar is positioned and installed on the side plate.

4. The battery module according to claim 2, characterized in that: The external electrical connection portion is provided with an external nut.

5. The battery module according to claim 3, characterized in that: The output pole busbar is in a flat plate shape, is located on the inner side of the side plate, and is parallel to and in contact with the side plate.

6. The battery module according to claim 5, characterized in that: The inner side wall of the side plate is provided with a positioning groove, and at least a part of the output pole busbar is positioned and installed in the positioning groove.

7. The battery module according to claim 5 or 6, characterized in that: The side plate is provided with a second opening corresponding to the external electrical connection portion, and the external electrical connection portion is exposed to the rubber block and the housing through the second opening.

8. The battery module according to claim 2, characterized in that: The output pole bus is partially bent and extends toward the pole ear side of the battery cell stack to form the external electrical connection part. The top of the rubber block is provided with a third opening corresponding to the external electrical connection part. The external electrical connection part is exposed to the rubber block and the shell from the third opening.

9. The battery module according to claim 3, characterized in that: The shell further includes a bottom plate and an upper cover. The bottom plate is connected to the two oppositely arranged side plates and cooperates with the upper cover to form the shell having the first openings at both ends.

10. The battery module according to claim 1, characterized in that: The rubber block wraps a portion of the output busbar assembly and at least a portion of the tab of the battery cell stack.

11. The battery module according to claim 1, characterized in that: The adhesive block comprises foamed adhesive.

12. The battery module according to claim 2, characterized in that: The insulating member includes an insulating film.

13. A battery pack, characterized in that: Comprising a battery module as claimed in any one of claims 1 to 12.

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