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 shell and a battery module, wherein the shell is provided with an opening; the battery cell stacking body is provided with a tab side, the battery cell stacking body is arranged in the shell, and the tab side of the battery cell stacking body corresponds to the opening; 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 battery module and the battery pack at least have the following beneficial effects that the rubber block is filled in the opening of the shell, the opening is blocked by the rubber block, and the tab side of the battery cell stacking body is covered by the rubber block, so that thermal protection and heat spreading prevention can be realized through the rubber block, additional parts do not need to be arranged for blocking the opening, the number of the parts is reduced, the weight is reduced, and the cost is reduced. The cost is reduced, and the space utilization rate and the energy density of the battery module and the battery pack are improved.

Description

Technical Field

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

[0002] The outer wall of an existing battery module is generally formed by a shell, which provides a relatively closed installation space for the components installed in the shell. The overall structure of the shell is bulky, occupies a large space, and has a large overall weight, which reduces the overall space utilization of the battery module and is not conducive to improving the energy density of the battery module. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a battery module and a battery pack to solve the problems of large overall weight and low space utilization of the battery module in the prior art, so as to improve the space utilization and energy density of the battery module and the battery pack.

[0004] To achieve the above-mentioned and other related purposes, the present invention provides a battery module, comprising:

[0005] a housing having an opening;

[0006] A cell stack having a tab side, the cell stack being mounted in the housing, and the tab side of the cell stack corresponding to the opening;

[0007] A rubber block is filled in the opening to block the opening and cover the tab side of the battery cell stack, wherein the outer side wall of the rubber block forms a part of the outer side wall of the battery module.

[0008] Optionally, the battery module further includes a sampling assembly, which is located inside the shell, directly positioned and mounted on the shell, and electrically connected to the battery cell stack.

[0009] Optionally, the rubber block wraps at least a portion of the sampling assembly and at least a portion of the tab of the battery cell stack.

[0010] Optionally, the shell includes an upper cover, and the sampling assembly is positioned and installed on the upper cover.

[0011] Optionally, the upper cover has a bending structure, and the sampling component includes a flexible circuit board. The flexible circuit board is positioned and installed on the upper cover and is connected and fixed to the bending structure.

[0012] Optionally, a portion of the upper cover is bent and extends toward the battery cell stack to form the bent structure, and the bent structure is overlapped with at least a portion of the flexible circuit board.

[0013] Optionally, the sampling assembly further includes a sampling element electrically connecting the flexible circuit board and the tab of the battery cell stack, the bending structure includes a bending portion, the flexible circuit board is fixed to the bending portion, and the sampling element includes an elastic clip, the elastic clip is connected to the flexible circuit board, and is clamped and fixed on the tab of the battery cell stack.

[0014] Optionally, the elastic clip has a first clamping portion and a second clamping portion that are arranged opposite to each other, and the first clamping portion and the second clamping portion cooperate to elastically clamp the tab extending between the first clamping portion and the second clamping portion.

[0015] Optionally, a pressing portion is provided on the second clamping portion, and the pressing portion has a pressed state and a released state. The second clamping portion is suitable for moving away from the first clamping portion when the pressing portion is in the pressed state, and the second clamping portion is suitable for moving closer to the second clamping portion when the pressing portion is in the released state.

[0016] Optionally, the bending structure includes a plurality of bending portions spaced apart along an extending direction of the flexible circuit board, and the flexible circuit board is fixed to the plurality of bending portions.

[0017] Optionally, the multiple bending portions include a first bending portion, a second bending portion and a third bending portion spaced apart along the extension direction of the flexible circuit board, the second bending portion is farther away from the flexible circuit board than the first bending portion and the third bending portion, a reinforcing plate is sandwiched between the flexible circuit board and the second bending portion, the reinforcing plate is used to compensate for the distance difference between the second bending portion and the flexible circuit board, and the side of the reinforcing plate facing the flexible circuit board is flush with the side of the first bending portion facing the flexible circuit board and the side of the third bending portion facing the flexible circuit board.

[0018] Optionally, the shell is provided with a first groove and / or a first boss, and the rubber block has a second boss corresponding to the first groove and / or a second groove corresponding to the first boss.

[0019] Optionally, the shell further includes a bottom plate and two side plates arranged opposite to each other, and the bottom plate and the side plates are connected and cooperate with the upper cover to construct the shell with openings at both ends.

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

[0021] As described above, the battery module and battery pack of the present invention have at least the following beneficial effects: the rubber block is filled in the opening of the shell, and the opening is sealed by the rubber block and the ear side of the battery cell stack is covered. Thermal protection can be achieved by the rubber block to prevent heat spread, and there is no need to set additional components to seal the opening, which reduces the number of components and reduces the weight, which is conducive to reducing costs, improving space utilization and improving the energy density of the battery module and battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a battery module embodiment 1 of the present utility model;

[0023] Figure 2 for Figure 1 Explosion diagram of the battery module;

[0024] Figure 3 for Figure 1 Exploded view of the local structure of the battery module;

[0025] Figure 4 for Figure 1 Schematic diagram of the partial connection between the sampling component and the shell of the battery module;

[0026] Figure 5 for Figure 4 Schematic diagram of the partial connection between the elastic clip and the battery cell stack;

[0027] Figure 6 for Figure 5 Schematic diagram of the structure of the elastic clip;

[0028] Figure 7 for Figure 5 A partial cross-sectional view of the middle elastic clip and the battery cell stack;

[0029] Figure 8 for Figure 7 A magnified schematic diagram of part A in the middle;

[0030] Figure 9 This is a schematic diagram of the partial connection between the sampling component and the shell of the second embodiment of the battery module of the utility model.

[0031] Part Number Description

[0032] Shell 1, upper cover 11, bending portion 111, first bending portion 112, second bending portion 113, third bending portion 114, side panel 12, bottom panel 13, first groove 14, first boss 15, battery cell stack 2, tab 21, rubber block 3, second groove 31, second boss 32, sampling assembly 4, flexible circuit board 41, sampling element 42, first clamping portion 421, second clamping portion 422, pressing portion 423, reinforcing plate 5, rivet 6. DETAILED DESCRIPTION

[0033] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0034] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the present invention without substantially changing the technical content.

[0035] See also Figure 1 and Figure 2 In some optional embodiments, the present application provides a battery pack, which includes a battery module.

[0036] See also Figures 1 to 3 In some optional embodiments, the battery module provided by the present application includes a housing 1, a battery cell stack 2, and a rubber block 3; in addition to the above-mentioned components, the battery module may also include a sampling assembly 4. The housing 1 has an 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 opening; the rubber block 3 fills the opening to seal the opening and covers the tab side of the battery cell stack 2, wherein the outer side wall of the rubber block 3 forms part of the outer side wall of the battery module. In other words, the outer side of the rubber block 3 does not have other structures to shield the rubber block 3, so that the rubber block 3 can serve the function and role of the end plate of a traditional battery module.

[0037] Optionally, the sampling assembly 4 is located within the housing 1, is directly positioned and mounted on the housing 1, and is electrically connected to the battery cell stack 2. The sampling assembly 4 is electrically connected to the battery cell stack 2 to collect information such as the temperature and voltage of the battery cell stack 2. The battery cell stack 2 includes a plurality of stacked battery cells, each having a tab 21. The tab side of the battery cell stack 2 is located on the same side as the tab 21 of the battery cell, and the sampling assembly 4 is electrically connected to the tab 21 of the battery cell.

[0038] Optionally, the housing 1 is provided with a first groove 14 and / or a first boss 15, and the rubber block 3 has a second boss 32 corresponding to the first groove 14 and / or a second groove 31 corresponding to the first boss 15. This structural design is conducive to increasing the contact area between the rubber block 3 and the housing 1, thereby increasing friction to enhance the reliability of the connection between the rubber block 3 and the housing 1. In particular, it can also reduce the risk of failure of the connection between the rubber block 3 and the housing 1 due to aging after long-term use.

[0039] Optionally, the rubber block 3 comprises foamed rubber, which is easy, convenient, quick to fill, and has good insulation and heat-insulating effects. The second boss 32 and the second groove 31 can be formed during the filling process of the foamed rubber.

[0040] Optionally, the shell 1 includes an upper cover 11, a bottom plate 13 and two side plates 12, the two side plates 12 are arranged opposite to each other, and the bottom plate 13 and the side plates 12 are connected and cooperate with the upper cover 11 to construct a shell 1 with openings at both ends. Specifically, the bottom plate 13 is located between the two side plates 12, and the two ends of the bottom plate 13 are respectively connected to the two side plates 12 to form a U-shaped structure with the opening facing the upper cover 11. This structural design eliminates the end plates that cover the openings, which is conducive to simplifying the structure and reducing weight. In the present application, the distribution direction of the upper cover 11 and the bottom plate 13 is the same as the height direction of the side plates 12, that is, the Z direction in the accompanying 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 accompanying drawings.

[0041] Optionally, the upper cover 11 is provided with a glue injection hole, through which foam glue can be injected into the housing 1 to form a glue block 3 to seal the opening of the housing 1 and cover the tab side of the battery cell stack 2. Furthermore, the glue block 3 wraps at least a portion of the sampling assembly 4 and at least a portion of the tab 21 of the battery cell stack 2. During the specific setting, a tool can be used to first seal the opening, and then foam glue can be injected into the housing 1. After the foam glue has foamed and formed into a stable glue block structure and sealed the opening, the tool can be removed to complete the setting of the glue block 3.

[0042] In the battery module of the above embodiment, the shell 1 has an opening, and the opening is sealed by the rubber block 3 and the ear side of the battery cell stack 2 is covered. The rubber block 3 forms a part of the outer wall of the battery module. Not only does it not need to set an additional end plate to seal the opening, which is beneficial to simplifying the structure and reducing weight, but the rubber block 3 has the function of heat insulation and flame retardancy, which is beneficial to play a protective role when thermal runaway occurs in the battery module and reduce the risk of heat spread. In addition, the sampling component 4 is directly positioned and installed on the shell 1, and the shell 1 provides positioning support for the sampling component 4. There is no need to set an additional plastic bracket to achieve the positioning and installation of the sampling component 4, which reduces the number of components and the overall weight, and is beneficial to reducing costs, improving space utilization and the energy density of the battery module.

[0043] See also Figure 1 、 Figure 2 、 Figure 4 and Figure 9 In some optional embodiments, the sampling assembly 4 includes a flexible circuit board 41 and a sampling element 42. The flexible circuit board 41 is positioned and mounted on the upper cover 11 and electrically connected to the tab 21 of the battery cell stack 2 via the sampling element 42. In other words, the sampling element 42 electrically connects the flexible circuit board 41 to the tab 21 of the battery cell stack 2, and the flexible circuit board 41 is electrically connected to the tab 21 of the battery cell via the sampling element 42 to collect battery cell information. It should be understood that the flexible circuit board 41 is not limited to being positioned and mounted on the upper cover 11; it can also be positioned and mounted on the side panel 12.

[0044] Optionally, the flexible circuit board 41 extends along the stacking direction of the multiple battery cells, and the number of sampling elements 42 is multiple, and the multiple sampling elements 42 are distributed along the extension direction of the flexible circuit board 41. In this application, the extension direction of the flexible circuit board 41, the distribution direction of the multiple sampling elements 42, and the stacking direction of the multiple battery cells are the same, that is, the Y direction in the drawings.

[0045] Optionally, the upper cover 11 has a bending structure, and the flexible circuit board 41 is connected and fixed to the bending structure. The flexible circuit board 41 can be adhesively fixed to the bending structure or riveted by rivets 6. Furthermore, a portion (e.g., an end) of the upper cover 11 is bent and extends toward the battery cell stack 2 to form a bending structure, and the bending structure overlaps at least a portion of the flexible circuit board 41. The rubber block 3 wraps around at least a portion of the sampling assembly 4 to further enhance the stability of the sampling assembly 4.

[0046] Optionally, the sampling element 42 includes a nickel sheet, and the sampling element 42 can be welded and fixed to the tab 21 of the battery cell.

[0047] In the battery module of the above embodiment, the upper cover 11 has a bending structure for positioning and connecting with the flexible circuit board 41 . The positioning and connection operation of the bending structure and the flexible circuit board 41 is simple and convenient, which helps to reduce the difficulty of positioning and installing the flexible circuit board 41 .

[0048] See also Figures 1 to 8 In some optional embodiments, the bending structure includes a bending portion 111, and the flexible circuit board 41 is riveted to the bending portion 111. The sampling element 42 includes an elastic clip, which is connected to the flexible circuit board 41 and clamped to the tab 21 of the battery cell stack 2. The elastic clip can be made of nickel sheet.

[0049] Optionally, the elastic clip has a first clamping portion 421 and a second clamping portion 422 arranged opposite each other. The first clamping portion 421 and the second clamping portion 422 cooperate to elastically clamp the tab 21 extending between the first clamping portion 421 and the second clamping portion 422. The elastic clip clamps the tab 21 of the battery cell to fix the elastic clip in the welding position, thereby achieving the installation and fixation of the sampling element 42 and the flexible circuit board 41. To improve the fixing stability of the sampling element 42, the elastic clip can also be welded to the tab 21 after the elastic clip is clamped and positioned. Furthermore, a pressing portion 423 is provided on the second clamping portion 422. The pressing portion 423 has a compressed state and a released state. The second clamping portion 422 is adapted to move away from the first clamping portion 421 when the pressing portion 423 is in the compressed state, and to move closer to the second clamping portion 422 when the pressing portion 423 is in the released state. Specifically, the first clamping portion 421 is flat-plate-shaped, and one end of the first clamping portion 421 is partially extended and bent to form a second clamping portion 422 arranged opposite to the first clamping portion 421. The movable end of the second clamping portion 422 is tilted in a direction away from the first clamping portion 421 to cooperate with the second clamping portion 422 to define a guide opening. The guide opening has a guiding function so that the tab 21 extends from the guide opening into between the first clamping portion 421 and the second clamping portion 422.

[0050] Optionally, a reinforcing plate 5 is sandwiched between the flexible circuit board 41 and the bent portion 111 , and the reinforcing plate 5 is helpful in improving the connection strength between the flexible circuit board 41 and the bent portion 111 .

[0051] In the battery module of the above embodiment, the upper cover 11 is provided with only a single bent portion 111, which is conducive to simplifying the structure of the upper cover 11. The sampling element 42 of the sampling assembly 4 adopts an elastic clip with elastic clamping performance, so that the sampling assembly 4 can be connected and fixed to the tab 21 of the battery cell stack 2, which is conducive to improving the stability and firmness of the positioning and installation of the sampling assembly 4.

[0052] See also Figure 9 In some optional embodiments, the bending structure includes a plurality of bending portions spaced apart along the extending direction of the flexible circuit board 41 , and the flexible circuit board 41 and the plurality of bending portions are fixed by riveting with rivets 6 .

[0053] Optionally, the plurality of bending portions include a first bending portion 112, a second bending portion 113, and a third bending portion 114 spaced apart along the extending direction of the flexible circuit board 41, the second bending portion 113 is farther away from the flexible circuit board 41 than the first bending portion 112 and the third bending portion 114, a reinforcing plate 5 is sandwiched between the flexible circuit board 41 and the second bending portion 113, the reinforcing plate 5 is used to compensate for the distance difference between the second bending portion 113 and the flexible circuit board 41, and the side of the reinforcing plate 5 facing the flexible circuit board 41 is flush with the side of the first bending portion 112 facing the flexible circuit board 41 and the side of the third bending portion 114 facing the flexible circuit board 41; in other words, the first bending portion 112 is flush with the side of the first bending portion 112 facing the flexible circuit board 41 and the side of the third bending portion 114 facing the flexible circuit board 41; The side of the second bent portion 113 facing the flexible circuit board 41 is flush with the side of the third bent portion 114 facing the flexible circuit board 41. When the flexible circuit board 41 is in contact with the first bent portion 112 and the third bent portion 114, a gap exists between the side of the second bent portion 113 facing the flexible circuit board 41 and the flexible circuit board 41. The thickness of the reinforcing plate 5 is equal to the gap. By providing the reinforcing plate 5, on the one hand, the connection strength can be improved. On the other hand, the surfaces of the first bent portion 112, the reinforcing plate 5 and the third bent portion 114 that are in contact with the flexible circuit board 41 are all located on the same plane, which is beneficial to ensure that the flexible circuit board 41 is fixed in the same plane and is beneficial to the positioning of the sampling element 42.

[0054] In the battery module of the above embodiment, the upper cover 11 has a plurality of bending portions, and the flexible circuit board 41 is connected to the plurality of bending portions to realize the positioning and installation of the sampling component 4, and the installation and positioning of the sampling component 4 is simple and convenient.

[0055] The battery module and battery pack of the present invention not only simplify the structure of the battery module, but also solve the positioning and installation of the sampling component 4. In particular, compared with the traditional battery module, the end plate and the plastic bracket are eliminated, the structure is simpler, and it is conducive to reducing weight; the sampling component 4 is directly positioned and connected to the shell 1, and the sampling component 4 does not need to be fixed to the plastic bracket by gluing or hot riveting. The connection of the flexible circuit board 41 is more reliable, especially compared with the bonding method, and is not easy to fail after long-term use. It also does not need to be fixed to the plastic bracket by hot riveting, which simplifies the process and reduces costs.

[0056] Throughout this specification, references to terms such as "this embodiment," "example," and "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0057] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A battery module, characterized in that: include: a housing having an opening; A cell stack having a tab side, the cell stack being mounted in the housing, and the tab side of the cell stack corresponding to the opening; A rubber block is filled in the opening to block the opening and cover the tab side of the battery cell stack, wherein 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, wherein: The battery module further includes a sampling assembly, which is located in the shell, directly positioned and mounted on the shell, and electrically connected to the battery cell stack.

3. The battery module according to claim 2, characterized in that: The rubber block wraps at least a portion of the sampling assembly and at least a portion of the tab of the battery cell stack.

4. The battery module according to claim 2, wherein: The shell includes an upper cover, and the sampling component is positioned and installed on the upper cover.

5. The battery module according to claim 4, characterized in that: The upper cover has a bending structure, and the sampling component includes a flexible circuit board. The flexible circuit board is positioned and installed on the upper cover and is connected and fixed to the bending structure.

6. The battery module according to claim 5, characterized in that: A portion of the upper cover is bent and extends toward the battery cell stack to form the bent structure, and the bent structure is overlapped with at least a portion of the flexible circuit board.

7. The battery module according to claim 5 or 6, characterized in that: The sampling assembly also includes a sampling element electrically connecting the flexible circuit board and the tab of the battery cell stack. The bending structure includes a bending portion, and the flexible circuit board is fixed to the bending portion. The sampling element includes an elastic clip, which is connected to the flexible circuit board and clamped and fixed on the tab of the battery cell stack.

8. The battery module according to claim 7, characterized in that: The elastic clip has a first clamping portion and a second clamping portion that are arranged opposite to each other. The first clamping portion and the second clamping portion cooperate to elastically clamp the tab extending between the first clamping portion and the second clamping portion.

9. The battery module according to claim 8, characterized in that: The second clamping portion is provided with a pressing portion, which has a pressed state and a released state. The second clamping portion is suitable for being away from the first clamping portion when the pressing portion is in the pressed state, and is suitable for being close to the second clamping portion when the pressing portion is in the released state.

10. The battery module according to claim 5 or 6, characterized in that: The bending structure includes a plurality of bending portions spaced apart along an extending direction of the flexible circuit board, and the flexible circuit board is fixed to the plurality of bending portions.

11. The battery module according to claim 10, characterized in that: The multiple bending portions include a first bending portion, a second bending portion and a third bending portion spaced apart along the extension direction of the flexible circuit board. The second bending portion is farther away from the flexible circuit board than the first bending portion and the third bending portion. A reinforcing plate is sandwiched between the flexible circuit board and the second bending portion. The reinforcing plate is used to compensate for the distance difference between the second bending portion and the flexible circuit board, and a side of the reinforcing plate facing the flexible circuit board is flush with a side of the first bending portion facing the flexible circuit board and a side of the third bending portion facing the flexible circuit board.

12. The battery module according to claim 1, wherein: The shell is provided with a first groove and / or a first boss, and the rubber block has a second boss corresponding to the first groove and / or a second groove corresponding to the first boss.

13. The battery module according to claim 4, characterized in that: The shell further includes a bottom plate and two side plates arranged opposite to each other. The bottom plate and the side plates are connected and cooperate with the upper cover to form the shell with openings at both ends.

14. The battery module according to claim 1, wherein: The rubber block comprises foamed rubber.

15. A battery pack, characterized in that: Comprising the battery module according to any one of claims 1 to 14.

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