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 an opening; the plurality of battery cell stacking bodies are provided with tab sides, the plurality of battery cell stacking bodies are arranged in the shell in a stacking manner, and the tab sides of the battery cell stacking bodies correspond to the openings; the partition plate is arranged on the shell and is used for separating two adjacent battery cell stacking bodies; and the rubber block is filled at the opening to block the 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. The influence of thermal runaway of the battery cell stacking body on the adjacent battery cell stacking body is reduced through the partition plate, and the risk of heat spreading is reduced; the rubber block has heat-insulating and flame-retardant effects, so that the risk of heat spreading of the battery cell stack is further reduced, the opening is blocked by the rubber block, the structural strength and the product performance are ensured, an end plate does not need to be additionally and independently arranged to block the opening, the safety performance of the battery module and the battery pack is improved, and the cost is reduced.

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] With the development of battery technology, batteries are more and more widely used, and the safety requirements are also getting higher and higher. In order to meet the usage requirements, multiple battery cell stacks are generally arranged inside a battery module. During the use process of the battery cell stack, there is a risk of thermal runaway. If the battery cell stack has a thermal runaway, it is very easy to affect the adjacent battery cell stacks that are operating normally, thereby triggering more serious safety accidents and resulting in poor safety performance. 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 problem that the battery cell stacks in the existing battery module are likely to affect adjacent battery cell stacks during thermal runaway, so as to improve the safety performance of the battery module and the battery pack.

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

[0005] A housing, the housing has an opening;

[0006] Multiple battery cell stacks, the battery cell stack has a tab side, and multiple battery cell stacks are stacked and arranged inside the housing, and the tab side of the battery cell stack corresponds to the opening;

[0007] A partition, the partition is arranged on the housing and separates two adjacent battery cell stacks;

[0008] A rubber block, the rubber block is filled at the opening to block the 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.

[0009] Optionally, the battery module further includes a sampling component, at least a part of the sampling component is positioned and installed on the partition and is electrically connected to the battery cell stack.

[0010] Optionally, the sampling component includes a transmission element and a sampling element, the transmission element includes a flexible flat cable or a wire harness, and is electrically connected to the tab of the battery cell stack through the sampling element.

[0011] Optionally, the partition is provided with a positioning avoidance groove, and at least a part of the transmission element is installed in the positioning avoidance groove.

[0012] Optionally, a side wall of the partition plate is locally thinned to form the positioning avoidance groove provided on the side wall of the partition plate.

[0013] Optionally, a depth of the positioning avoidance groove in a thickness direction of the partition plate is T1, and 0.5 mm ≤ T1 ≤ 2 mm.

[0014] Optionally, a top wall of the partition plate is locally recessed downward to form the positioning avoidance groove provided at a top end of the partition plate.

[0015] Optionally, the positioning avoidance groove penetrates through end walls at two ends of the partition plate distributed along its length direction and penetrates through a top end wall of the partition plate.

[0016] Optionally, a cavity is provided inside the partition plate, and the cavity penetrates through end walls at two ends of the partition plate distributed along its length direction.

[0017] Optionally, a wall thickness of the cavity is T2, and 1 mm ≤ T2 ≤ 3 mm; a width of the cavity in a thickness direction of the partition plate is T3, and 1 mm ≤ T3 ≤ 10 mm.

[0018] Optionally, the housing includes a bottom plate, and a local portion of the bottom plate protrudes and extends along a height direction of the battery cell stack to form the partition plate.

[0019] Optionally, the housing further includes a U-shaped frame body, a part of the U-shaped frame body forms an upper cover of the housing, and another part of the U-shaped frame body forms a side plate of the housing.

[0020] Optionally, the U-shaped frame body is connected to the bottom plate to construct the housing having the openings at two ends.

[0021] Optionally, an exhaust hole is provided on the upper cover.

[0022] Optionally, the rubber block includes foamed rubber.

[0023] To achieve the above object and other related objects, the present application further provides a battery pack including the battery module as described above.

[0024] As described above, the battery module and battery pack of the present utility model have at least the following beneficial effects: By providing a partition on the housing, the partition is convenient to arrange and has a stable structure. The partition helps to separate adjacent battery cell stacks, reducing the impact of a battery cell stack in thermal runaway on adjacent battery cell stacks and reducing the risk of thermal propagation. Based on this, a rubber block is provided to cover the tab side of the battery cell stack, which has the functions of heat insulation and flame retardancy, and is beneficial to further reducing the risk of thermal propagation of the battery cell stack. The rubber block seals the opening and forms a part of the outer wall of the battery module, which not only ensures the structural strength and product performance but also eliminates the need for an additional separate end plate to seal the opening, thus enhancing the safety performance of the battery module and battery pack and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. 1 is an exploded schematic view of the first embodiment of the battery module of the present utility model;

[0026] Figure 2 FIG. Figure 1 2 is the front view of the battery module in FIG. 1;

[0027] Figure 3 FIG. Figure 2 3 is a partially enlarged schematic view of the bottom plate and the partition in FIG. 2;

[0028] Figure 4 FIG. Figure 1 4 is a schematic view of the structure when the sampling component is installed on the partition in FIG. 3;

[0029] Figure 5 FIG.

[0030] Figure 6 FIG. 5 is a partial structural schematic view of the second embodiment of the battery module of the present utility model;

[0031] Figure 7 FIG. Figure 6 6 is a schematic view of the structure when the sampling component is installed on the partition in FIG. 5;

[0032] Figure 8 FIG. Figure 7 7 is the front view of the sampling component and the partition in FIG. 6;

[0033] Figure 9 FIG. Figure 7 8 is a partially enlarged schematic view of part A in FIG. 7;

[0034] Figure 10 FIG. 9 is a structural schematic view of the first embodiment of the battery module of the present utility model.

[0035] DESCRIPTION OF REFERENCE NUMERALS

[0036] Housing 1, upper cover 11, exhaust hole 111, side plate 12, bottom plate 13, battery cell stack 2, tab 21, rubber block 3, sampling assembly 4, transmission element 41, sampling element 42, partition 5, positioning avoidance groove 51, cavity 52. Detailed implementation manners

[0037] 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.

[0038] It should be noted that the structures, ratios, 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 the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present 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 scope for the implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present utility model can be implemented.

[0039] Refer to Figure 1 and Figure 5 , in some alternative embodiments, the present application provides a battery pack, and the battery pack includes a battery module.

[0040] Refer to Figure 1 , Figure 5 and Figure 10 , in some alternative embodiments, the battery module provided by the present application includes a housing 1, a plurality of battery cell stacks 2, a partition 5, and a rubber block 3; in addition to the above components, the battery module may further include a sampling assembly 4. The housing 1 has an opening; the battery cell stack 2 has a tab side, and a plurality of battery cell stacks 2 are stacked and arranged in the housing 1, and the tab side of the battery cell stack 2 corresponds to the opening; the partition 5 is disposed on the housing 1 and separates two adjacent battery cell stacks 2; the rubber block 3 is filled at the opening to block the opening and cover the tab side of the battery cell stack 2, and the outer sidewall of the rubber block 3 forms a part of the outer sidewall 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 the traditional battery module.

[0041] Optionally, the battery cell stack 2 includes a plurality of battery cells arranged in a stack. The battery cells have tabs 21, and the tabs 21 are provided at both ends of the battery cells distributed in the length direction thereof. The tab side of the battery cell stack 2 and the tab side of the battery cells having the tabs 21 are on the same side. In the present application, the arrangement direction of the plurality of battery cell stacks 2, the stacking direction of the plurality of battery cells in the same battery cell stack 2, and the thickness direction of the separator 5 are the same, that is, the Y 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 separator 5 are the same, that is, the X direction in the drawings.

[0042] Optionally, the housing 1 includes a bottom plate 13. A part of the bottom plate 13 protrudes and extends in the height direction of the battery cell stack 2 to form a separator 5. That is to say, the separator 5 and the bottom plate 13 can be an integral structure, which is beneficial to simplifying the assembly process. Further, the separator 5 and the bottom plate 13 can be made of aluminum extrusions, and the separator 5 and the bottom plate 13 can be vertically arranged in an inverted T shape. In the present application, the height direction of the battery cell stack 2 and the height direction of the separator 5 are the same, that is, the Z direction in the drawings.

[0043] Optionally, the housing 1 further includes a U-shaped frame body. A part of the U-shaped frame body forms the upper cover 11 of the housing 1, and another part of the U-shaped frame body forms the side plate 12 of the housing 1. The structure is simple and no further assembly is required, which is beneficial to simplifying the assembly process; wherein, an exhaust hole 111 is provided on the upper cover 11. When thermal runaway occurs in the battery cell stack 2, the high-temperature flue gas can be discharged from the exhaust hole 111 out of the housing 1. Further, the U-shaped frame body is connected to the bottom plate 13 to construct a housing 1 with openings at both ends.

[0044] Optionally, the rubber block 3 includes foamed rubber, which is simple, convenient, fast to fill, and has good insulation and heat insulation effects. When specifically setting, a tooling can be used to block the opening first, and then foamed rubber is poured into the housing 1. When the foamed rubber is foamed and forms a stable rubber block structure and blocks the opening, the tooling is removed, thereby completing the setting of the rubber block 3.

[0045] In the battery module of the above embodiment, adjacent battery cell stacks 2 are separated by the separator 5 provided on the housing 1, which can realize the protection against thermal runaway between the battery cell stacks 2, is beneficial to reducing the influence of the battery cell stack 2 with thermal runaway on adjacent normal battery cell stacks 2, and reducing the risk of further spread of thermal runaway; by covering the tab side of the battery cell stack 2 with the rubber block 3, it can play a role in flame retardancy and heat insulation, further reducing the risk of heat spread and improving the safety performance; in addition, when the rubber block 3 covers the tab side of the battery cell stack 2, it can also block the opening of the housing 1 and form a part of the outer wall of the battery module, so that the rubber block 3 can replace the end plate, and there is no need to separately provide an additional end plate, which is beneficial to reducing the weight and cost.

[0046] See Figure 4 and Figure 6, in some alternative embodiments, at least a part of the sampling component 4 is positioned and installed on the partition 5. The sampling component 4 is electrically connected to the battery cell stack 2, and information such as the temperature and voltage of the battery cell stack 2 can be collected through the sampling component 4.

[0047] Optionally, the sampling component 4 includes a transmission element 41 and a sampling element 42. The transmission element 41 includes a flexible flat cable or a wire harness. The transmission element 41 is electrically connected to the tab 21 of the battery cell stack 2 through the sampling element 42. Among them, the sampling element 42 includes a nickel sheet, and the nickel sheet is electrically connected to the tab 21 of the battery cell. Using a flexible flat cable or a wire harness for the transmission element 41 is beneficial to reducing costs and has a flexible and convenient wire routing layout.

[0048] Optionally, the partition 5 is provided with a positioning avoidance groove 51. At least a part of the transmission element 41 is installed in the positioning avoidance groove 51. The installation is convenient, the layout is compact, and it is beneficial to improve the space utilization rate. Among them, both ends of the transmission element 41 extend out of the positioning avoidance groove 51 and are each connected to a plurality of sampling elements 42. The plurality of sampling elements 42 can be distributed along the stacking direction of the battery cells. The sampling elements 42 can be correspondingly arranged with the tabs 21 of the battery cells so as to collect information of each battery cell.

[0049] In the battery module of the above embodiment, the sampling component 4 is positioned and installed on the partition 5. The installation is simple and convenient. The partition 5 provides installation support for the sampling component 4, and a separate support component can be omitted, which is beneficial to simplifying the structure and reducing costs.

[0050] See Figure 3 and Figure 8 , in some alternative embodiments, the positioning avoidance groove 51 penetrates through both end walls of the partition 5 distributed along its length direction and through the top end wall of the partition 5. This structural design facilitates the installation and wire routing of the transmission element 41, and the assembly is simple and convenient. Among them, the longitudinal section of the positioning avoidance groove 51 can be in an L shape, a U shape or other shapes, with a simple structure and low forming and manufacturing difficulty.

[0051] See Figures 1 to 4 , in some alternative embodiments, a part of the side wall of the partition 5 is thinned to form a positioning avoidance groove 51 provided on the side wall of the partition 5. Among them, the partition 5 has a first side wall and a second side wall distributed along its thickness direction, and the positioning avoidance groove 51 is provided on the first side wall and / or the second side wall of the partition 5.

[0052] Optionally, the longitudinal section of the positioning avoidance groove 51 is in an L shape.

[0053] Optionally, the depth of the positioning avoidance groove 51 in the thickness direction of the partition 5 is T1, and 0.5 mm ≤ T1 ≤ 2 mm. Further, T1 can be any value among numerical values such as 0.5 mm, 0.7 mm, 1 mm, 1.5 mm or 2 mm.

[0054] For the battery module of the above embodiment, the positioning and avoiding groove 51 can be arranged on the first side wall and the second side wall of the partition 5 facing away from each other, and the adjacent sampling components 4 can be separated by the partition 5, which is beneficial to reducing the influence of the sampling component 4 corresponding to the battery cell stack 2 with thermal runaway on other normal sampling components 4, and is beneficial to improving safety.

[0055] See Figures 5 to 9 , in some alternative embodiments, a part of the top wall of the partition 5 is recessed downward to form a positioning and avoiding groove 51 provided at the top end of the partition 5.

[0056] Optionally, the longitudinal section of the positioning and avoiding groove 51 is U-shaped.

[0057] For the battery module of the above embodiment, at least part of the transmission elements 41 of the adjacent sampling components 4 are located in the positioning and avoiding groove 51, and the positioning and avoiding groove 51 encloses at least part of the transmission elements 41, which has a certain protective effect on the transmission elements 41 and is not easily interfered by other components.

[0058] See Figure 3 , in some alternative embodiments, a cavity 52 is provided inside the partition 5, and the cavity 52 penetrates through the end walls at both ends of the partition 5 distributed along its length direction.

[0059] Optionally, the wall thickness of the cavity 52 is T2, and 1 mm ≤ T2 ≤ 3 mm. Further, T2 can be any value among values such as 1 mm, 1.5 mm, 1.7 mm, 2 mm, 2.5 mm or 3 mm.

[0060] Optionally, the width of the cavity 52 in the thickness direction of the partition 5 is T3, and 1 mm ≤ T3 ≤ 10 mm. Further, T3 can be any value among values such as 1 mm, 2 mm, 4 mm, 8 mm, 8.5 mm or 10 mm.

[0061] For the battery module of the above embodiment, the cavity 52 is provided inside the partition 5, which is beneficial to reducing the weight of the partition 5, thereby being beneficial to reducing the overall weight of the battery module and lowering the cost; in addition, the provision of a cavity inside the partition 5 is also beneficial to improving the heat insulation effect of the partition 5, thereby being beneficial to improving the safety performance of the battery module.

[0062] For the battery module and battery pack of the present utility model, the partition 5 separates the battery cell stack 2, and the rubber block 3 covers the tab side of the battery cell stack 2, which is beneficial to reducing the spread risk of the battery cell stack 2 during thermal runaway, and the rubber block 3 can replace the traditional end plate, which is beneficial to simplifying the structure and lowering the cost while ensuring the product performance of the battery module and battery pack.

[0063] 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.

[0064] The above embodiments are only illustrative of the principles and effects of the present utility model and are not intended 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 an opening; A plurality of battery cell stacks, each having a tab side, wherein the plurality of battery cell stacks are stacked and arranged in the housing, and the tab side of the battery cell stack corresponds to the opening; A partition, which is arranged on the housing and separates two adjacent battery cell stacks; A rubber block is filled at the opening to block the 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.

2. The battery module according to claim 1, characterized in that: The battery module further includes a sampling assembly, at least a portion of which is positioned and mounted on the partition and electrically connected to the battery cell stack.

3. The battery module according to claim 2, characterized in that: The sampling assembly includes a transmission element and a sampling element. The transmission element includes a flexible flat cable or a wiring harness and is electrically connected to the tabs of the battery cell stack through the sampling element.

4. The battery module according to claim 3, characterized in that: The partition plate is provided with a positioning avoidance groove, and at least a part of the transmission element is installed in the positioning avoidance groove.

5. The battery module according to claim 4, characterized in that: The side wall of the partition is partially thinned to form the positioning avoidance groove arranged on the side wall of the partition.

6. The battery module according to claim 5, characterized in that: The depth of the positioning avoidance groove in the thickness direction of the partition is T1, 0.5mm≤T1≤2mm.

7. The battery module according to claim 4, characterized in that: The top wall of the partition is partially recessed downward to form the positioning avoidance groove arranged at the top end of the partition.

8. The battery module according to any one of claims 4 to 7, characterized in that: The positioning avoidance groove passes through the end walls of both ends of the partition along the length direction thereof and passes through the top end wall of the partition.

9. The battery module according to claim 1, characterized in that: A cavity is provided inside the partition, and the cavity penetrates the end walls of both ends of the partition distributed along the length direction thereof.

10. The battery module according to claim 9, characterized in that: The wall thickness of the cavity is T2, 1mm≤T2≤3mm; the width of the cavity in the thickness direction of the partition is T3, 1mm≤T3≤10mm.

11. The battery module according to claim 1, characterized in that: The housing includes a bottom plate, and a portion of the bottom plate is protrudingly arranged and extends along a height direction of the battery cell stack to form the partition.

12. The battery module according to claim 11, characterized in that: The shell further comprises a U-shaped frame, a part of which is formed as an upper cover of the shell, and another part of which is formed as a side plate of the shell.

13. The battery module according to claim 12, characterized in that: The U-shaped frame is connected to the bottom plate to form the shell with the openings at both ends.

14. The battery module according to claim 12, characterized in that: The upper cover is provided with an exhaust hole.

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

16. A battery pack, characterized in that: Comprising a battery module as claimed in any one of claims 1 to 15.

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