Battery pack

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery pack. The battery pack comprises a lower box body, an upper box body and a lower box body, wherein the lower box body is provided with a box opening and an accommodating cavity; the battery cell stacking body comprises a plurality of battery cells which are arranged in the accommodating cavity in a stacking manner; and the upper cover is provided with a pressing part, and the pressing part extends along the stacking direction of the plurality of battery cells and is suitable for pressing the plurality of battery cells when the upper cover and the lower box body are connected to seal and cover the box opening. The battery pack at least has the following beneficial effects that the plurality of battery cells are stacked in the accommodating cavity of the lower box body, the upper cover with the pressing part can apply pressure to the battery cells to prevent the battery cells from shaking while being assembled and connected with the lower box body, and the battery pack is simple and convenient to assemble, stable in structure and not easy to vibrate and lose efficacy; and the stability and the product quality of the overall structure of the battery pack are improved.

Description

Technical Field

[0001] This utility model belongs to the field of power battery technology, and in particular relates to a battery pack. Background Technology

[0002] With the development of battery technology, the application of batteries is becoming more and more widespread, and the requirements for battery energy are also getting higher and higher. Multiple cells need to be assembled into groups to meet the needs of use. However, there is a problem of unreliable assembly after multiple cells are assembled into groups. The cells are prone to shaking during use, especially when they encounter vibration, which makes them more prone to failure. The quality and stability of the product are difficult to guarantee. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a battery pack to solve the problems of poor assembly stability and easy shaking failure of multiple battery cells in the prior art, so as to improve the overall stability and quality of the battery pack structure.

[0004] To achieve the above and other related objectives, this utility model provides a battery pack, comprising:

[0005] The lower housing has an opening and a receiving cavity;

[0006] A battery cell stack comprising a plurality of battery cells stacked and arranged within the receiving cavity;

[0007] The upper cover has a pressing portion that extends along the stacking direction of the plurality of battery cells and is adapted to press the plurality of battery cells together when the upper cover is connected to the lower housing to seal the housing opening.

[0008] Optionally, the top cover includes a cover body, a portion of which protrudes and extends toward the battery cell to form the pressing portion.

[0009] Optionally, there are multiple cell stacks, and the pressing portion corresponds to at least two adjacent cell stacks and presses them together.

[0010] Optionally, the pressing part is connected and fixed to the top wall and / or side wall of the battery cell.

[0011] Optionally, the battery cell has a housing, a top wall insulator is provided on the top wall of the housing, a side wall insulator is provided on the side wall of the housing, and the pressing part is bonded and fixed to the top wall insulator and / or the side wall insulator.

[0012] Optionally, the pressing part includes a first connecting part pressed onto the top of two adjacent cell stacks, the first connecting part being bonded and fixed to the top wall insulator by adhesive blocks.

[0013] Optionally, the pressing part includes a second connecting part extending between two adjacent cell stacks, the second connecting part being bonded and fixed to the sidewall insulator by adhesive blocks.

[0014] Optionally, the pressing part includes a first connecting part and a second connecting part. The first connecting part is pressed onto the top of two adjacent cell stacks and is bonded to the top wall insulator with adhesive. The second connecting part extends between two adjacent cell stacks and is bonded to the side wall insulator with adhesive.

[0015] Optionally, the cross-section of the pressing part is T-shaped.

[0016] Optionally, the top wall insulator includes at least one of a top patch or an insulating coating; the side wall insulator includes at least one of an insulating film or an insulating coating.

[0017] As described above, the battery pack of this utility model has at least the following beneficial effects: multiple battery cells are stacked and arranged in the receiving cavity of the lower box, and the upper cover with the pressing part can apply pressure to the battery cells to prevent them from shaking while being assembled and connected with the lower box. The assembly is simple and convenient, the structure is stable, and it is not easy to fail due to vibration, which helps to improve the overall stability of the battery pack structure and the product quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the battery pack of this utility model;

[0019] Figure 2 for Figure 1 A schematic diagram of the explosion of the battery pack;

[0020] Figure 3 for Figure 1 Top view of the battery pack;

[0021] Figure 4 for Figure 3 A partial structural cross-sectional view at point AA;

[0022] Figure 5 for Figure 4 A magnified schematic diagram of part B in the middle;

[0023] Figure 6 for Figure 1 A bottom view of the upper middle cover;

[0024] Figure 7 for Figure 6 Sectional view at point CC.

[0025] Part Number Explanation

[0026] The battery cell stack 1, battery cell 11, housing 111, end plate 12, lower housing 2, upper cover 3, pressing part 31, first connecting part 311, second connecting part 312, top wall insulator 41, side wall insulator 42, rubber block 5, gap area 6. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0028] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0029] See Figure 1 , Figure 2 , Figure 6 and Figure 7 In some optional embodiments, this application provides a battery pack including a lower housing 2, a cell stack 1, and an upper cover 3. The lower housing 2 has a housing opening and a receiving cavity, and the cell stack 1 is adapted to be inserted into the receiving cavity from the housing opening; the cell stack 1 includes a plurality of cells 11 stacked in the receiving cavity; the upper cover 3 is located above the lower housing 2, and the upper cover 3 has a pressing part 31, which is disposed on the side of the upper cover 3 facing the lower housing 2. The pressing part 31 extends along the stacking direction of the plurality of cells 11 and is adapted to press the plurality of cells 11 tightly when the upper cover 3 is connected to the lower housing 2 to seal the housing opening, which helps to prevent the cells 11 from shaking.

[0030] Optionally, the top cover 3 includes a cover body, a portion of which protrudes and extends toward the battery cell 11 to form a pressing part 31. In other words, the pressing part 31 and the cover body are an integral structure, and the pressing part 31 and the cover body are not easy to separate, making the molding simple and convenient.

[0031] Optionally, the pressing part 31 is connected and fixed to multiple battery cells 11 of the same battery cell stack 1, so that the multiple battery cells 11 are connected into a whole through the pressing part 31, which helps to improve the rigidity and stability of the overall structure of the battery cell stack 1. Furthermore, the pressing part 31 is connected and fixed to the top wall and / or side wall of the battery cell 11. Specifically, the battery cell 11 has a main body and a housing 111. The main body is housed inside the housing 111. The housing 111 includes an aluminum shell or a steel shell. The aluminum shell has good stability and a stable structure that is not easily deformed. A top wall insulator 41 is provided on the top wall of the housing 111, and a side wall insulator 42 is provided on the side wall of the housing 111. The pressing part 31 is bonded and fixed to the top wall insulator 41 and / or the side wall insulator 42. The top wall insulator 41 includes at least one of a top patch or an insulating coating. The side wall insulator 42 includes at least one of an insulating film or an insulating coating. The top patch and the insulating film have good insulation performance and good insulation effect. The insulating coating has a stable structure and is not easy to detach from the housing 111 over a large area. The pressing part 31 has better connection stability with it.

[0032] In the battery pack of the above embodiment, the upper cover 3 has a pressing part 31 corresponding to the battery cell 11. When the upper cover 3 is connected to the lower housing 2, it can press down the battery cell 11, which can effectively prevent the battery cell 11 from shaking. Especially when subjected to vibration, it can also maintain the stability of the structure and is not easy to fail, thus improving the structural stability of the battery pack. The pressing part 31 is connected to multiple battery cells 11, so that multiple battery cells 11 can be assembled into a whole, which is beneficial to improving the rigidity of the battery pack and further improving the overall structural stability and product quality of the battery pack.

[0033] See Figures 1 to 5 In some optional embodiments, there are multiple cell stacks 1, and the pressing part 31 corresponds to at least two adjacent cell stacks 1 and presses them together. This helps to keep the cell stacks 1 relatively fixed and form a whole, thereby improving the rigidity and strength of the battery pack and thus improving the structural stability and product quality of the battery pack.

[0034] In some alternative embodiments, the pressing part 31 includes a first connecting part 311 pressed onto the top of two adjacent cell stacks 1, and the first connecting part 311 is bonded and fixed to the top wall insulator 41 by adhesive block 5. The pressing part 31 has a simple structure, and the pressing part 31 and the top wall insulator 41 can be bonded and fixed when the upper cover 3 and the lower box 2 are connected in place, which is convenient to operate and has high assembly efficiency.

[0035] In some optional embodiments, a gap region 6 is provided between two adjacent cell stacks 1. The pressing part 31 includes a second connecting part 312 extending into the gap region 6 between the two adjacent cell stacks 1. The second connecting part 312 is bonded and fixed to the sidewall insulator 42 by adhesive block 5. The pressing part 31 has a simple structure and the connection is simple, convenient and reliable. In addition, the second connecting part 312 extends between the two cell stacks 1 to connect the two adjacent cell stacks 1, which makes full use of the gap region 6 between the two cell stacks 1 and improves the space utilization rate. The second connecting part 312 filling the gap region 6 also helps to reduce the shaking of the cell stacks 1, which is beneficial to improving the product quality and safety of the battery pack.

[0036] See Figures 1 to 5 In some optional embodiments, there is a gap region 6 between two adjacent cell stacks 1. The pressing part 31 includes a first connecting part 311 and a second connecting part 312. The first connecting part 311 spans the gap region 6 and is pressed on the top of the two adjacent cell stacks 1, and is bonded and fixed to the top wall insulator 41 by adhesive block 5. That is, the two ends of the first connecting part 311 along its width direction press against the top of the two adjacent cell stacks 1 and are connected. The second connecting part 312 extends into the gap region 6 and is bonded and fixed to the side wall insulator 42 by adhesive block 5. In other words, the opposite sides of the second connecting part 312 are connected and fixed to the cell 11 of the two adjacent cell stacks 1.

[0037] Optionally, the cross-section of the pressing part 31 is T-shaped.

[0038] Optionally, the cell stack 1 further includes two end plates 12 arranged along the stacking direction of the multiple cells 11. The multiple cells 11 are sandwiched between the two end plates 12, and the end plates 12 can provide constraints for the cells 11. The pressing part 31 is bonded and fixed to the two end plates 12 at both ends in the stacking direction of the multiple cells 11. That is, the pressing part 31 can connect and fix the cells 11 to the end plates 12, making the cells 11 more stable relative to the end plates 12 and less prone to shaking, thereby improving the stability and rigidity of the overall structure of the cell stack 1. Furthermore, the first connecting part 311 is bonded and fixed to the two end plates 12 at both ends in the stacking direction of the multiple cells 11 by adhesive blocks. In this application, the stacking direction of multiple cells 11 in the same cell stack 1 is the same as the extension direction of the pressing part 31, that is, the Y direction in the figure; the arrangement direction of the two cell stacks 1 connected by the same pressing part 31 is the same as the width direction of the first connecting part 311, that is, the X direction in the figure; the distribution direction of the upper cover 3 and the lower box 2, the height direction of the cell stack 1 and the height direction of the cell 11 are the same, that is, the Z direction in the figure.

[0039] In the battery pack of the above embodiment, the first connecting part 311 and the second connecting part 312 cooperate to connect and fix the pressing part 31 to different parts of the housing 111, which increases the contact area and helps to improve the connection strength between the pressing part 31 and the housing 111. At the same time, the pressing part 31 also realizes the connection and fixation between the pressing part 31 and the adjacent cell stack 1, which makes the structure stable and helps to improve the rigidity and stability of the overall structure of the battery pack, thereby improving the product quality and safety of the battery pack.

[0040] The battery pack of this utility model has a pressing part 31 on the upper cover 3 that can press the battery cell 11 tightly, which is beneficial to improving the stability of the battery cell 11 after assembly and making it less prone to vibration failure. The pressing part 31 on the upper cover 3 is connected to the battery cell 11, so that multiple battery cells 11 assembled together can be connected together, and the battery cell stack 1 is relatively fixed to form a whole, which improves the overall mode of the battery cell stack 1, which is beneficial to improving the structural strength and rigidity of the battery pack, thereby improving the overall structural stability and product quality.

[0041] In the description of this specification, the references to terms such as "this embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above 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 one or more embodiments or examples.

[0042] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A battery pack, characterized in that, include: The lower housing has an opening and a receiving cavity; A battery cell stack comprising a plurality of battery cells stacked and arranged within the receiving cavity; The upper cover has a pressing portion that extends along the stacking direction of the plurality of battery cells and is adapted to press the plurality of battery cells together when the upper cover is connected to the lower housing to seal the housing opening.

2. The battery pack according to claim 1, characterized in that, The top cover includes a cover body, a portion of which protrudes and extends toward the battery cell to form the pressing portion.

3. The battery pack according to claim 1, characterized in that, The number of battery cell stacks is multiple, and the pressing part corresponds to at least two adjacent battery cell stacks and presses them together.

4. The battery pack according to any one of claims 1 to 3, characterized in that, The pressing part is connected and fixed to the top wall and / or side wall of the battery cell.

5. The battery pack according to claim 4, characterized in that, The battery cell has a housing, a top wall insulator is provided on the top wall of the housing, and a side wall insulator is provided on the side wall of the housing. The pressing part is bonded and fixed to the top wall insulator and / or the side wall insulator.

6. The battery pack according to claim 5, characterized in that, The pressing part includes a first connecting part pressed on the top of two adjacent cell stacks, and the first connecting part is bonded and fixed to the top wall insulator by adhesive blocks.

7. The battery pack according to claim 5, characterized in that, The pressing part includes a second connecting part that extends between two adjacent cell stacks, and the second connecting part is bonded and fixed to the sidewall insulator by adhesive blocks.

8. The battery pack according to claim 5, characterized in that, The pressing part includes a first connecting part and a second connecting part. The first connecting part is pressed onto the top of two adjacent cell stacks and is bonded to the top wall insulator with adhesive. The second connecting part extends between two adjacent cell stacks and is bonded to the side wall insulator with adhesive.

9. The battery pack according to claim 8, characterized in that, The cross-section of the pressing part is T-shaped.

10. The battery pack according to claim 5, characterized in that, The top wall insulator includes at least one of a top patch or an insulating coating; the side wall insulator includes at least one of an insulating film or an insulating coating.

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