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 box body, wherein the box body comprises a surrounding plate; the side plate assembly comprises a first side plate and a second side plate; the battery cell stacking body is clamped between the two first side plates, and the battery cell stacking body and the first side plates are mounted in the box body together; a gap is formed between the first side plate and the surrounding plate, at least part of the second side plate extends into the gap, and the second side plate abuts against the first side plate and the surrounding plate. The first side plate and the second side plate of the side plate assembly are separately arranged, the first side plate and the second side plate can be sequentially installed in the box body, enough installation space is provided when the first side plate and the battery cell stacking body are firstly installed in the box body, when the battery cell stacking body is installed in the box body, the initial compression force provided by the tool is reduced, the battery cell stacking body does not need to be overpressed, and the installation efficiency is improved. And in-box keeping of the theoretical width is facilitated, pressure does not need to be released after in-box, and scratching between the battery cell stacking body and the structural adhesive is avoided, so that the product quality of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power battery technical field, especially a kind of battery pack. BACKGROUND

[0002] At present, for the assembly technology that some soft package battery cell is directly integrated in battery pack, generally, the cell stack with multiple soft package battery cells is directly loaded into the box of battery pack, and is filled with structural glue for fixing, the cell stack needs to be completed in the overpressure state of tooling during the process of loading into the box, after the cell stack is loaded into the box, the tooling is removed, the cell stack is no longer clamped, and the pressure is released, the cell stack is prone to scratch the structural glue located at the bottom of the cell stack during the process of releasing pressure and rebounding, so that the structural glue is uneven, and the product quality of battery pack is affected. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a battery pack for solving the problems of inconvenient loading of cell stack into the box and easy scratching of structural glue in the prior art, so as to improve the product quality of battery pack.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a battery pack, which comprises:

[0005] A box body comprising a baffle;

[0006] A side plate assembly comprising a first side plate and a second side plate;

[0007] A cell stack clamped between two first side plates and installed in the box body together with the first side plates;

[0008] Wherein, the first side plate and the baffle have a gap, at least part of the second side plate extends into the gap, and the second side plate abuts against the first side plate and the baffle respectively.

[0009] Optionally, the first side plate has a first inclined structure on the side facing the second side plate, the distance between the first inclined structure and the baffle gradually decreases from top to bottom, and the second side plate has a second inclined structure matched with and abutting against the first inclined structure.

[0010] Optionally, the first side plate is provided with a first pressing position and a second pressing position, the second side plate is connected with the first side plate and covers the second pressing position, and the second side plate is staggered with the first pressing position.

[0011] Optionally, the first pressing position is arranged at both ends of the first side plate, and the second pressing position is arranged between the two ends of the first side plate.

[0012] Optionally, the first side plate is partially recessed towards one side of the second side plate to form the first pressing position and the second pressing position.

[0013] Optionally, the second pressing position is a first groove with a width decreasing from top to bottom, and a part of the second side plate is partially raised to form a first protrusion matching the first groove.

[0014] Optionally, the first side plate and the second side plate are connected and fixed by a locking member.

[0015] Optionally, the locking member comprises a first locking member, a first locking structure is arranged at a lower part of the second pressing position, and the first locking member is connected and locked with the first locking structure through the second side plate.

[0016] Optionally, the locking member comprises a second locking member, a second locking structure is arranged at a top part of the first side plate, and a top end of the second side plate is bent to form a bent part pressing down on the top end of the first side plate, and the second locking member is connected and locked with the second locking structure through the bent part.

[0017] Optionally, a part of the top part of the first side plate is recessed to form a second groove, the second locking structure is arranged in the second groove, a part of the bent part is raised to form a second protrusion matching the second groove, and the second locking member is connected and locked with the second locking structure through the second protrusion.

[0018] As described above, the battery pack has at least the following beneficial effects: the first side plate and the second side plate of the side plate assembly are arranged separately, so that the first side plate and the second side plate can be loaded into the box body in sequence, the first side plate has sufficient installation space when being installed in the box body together with the cell stack, the initial compression force provided by the tooling is reduced when the cell stack is loaded into the box body, the cell stack does not need to be over-pressed, which is beneficial to maintaining the theoretical width into the box, and the pressure does not need to be released after being loaded into the box, which is beneficial to avoiding the cell stack from being scratched with the structural adhesive, thereby being beneficial to improving the product quality of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is an exploded schematic view of an embodiment of the battery pack of the utility model;

[0020] Figure 2 It is a partial sectional view of an embodiment of the battery pack of the utility model; Figure 1 It is a partial structure schematic view of the cell stack and the first side plate;

[0021] Figure 3 It is a partial sectional view of an embodiment of the battery pack of the utility model;

[0022] Figure 4 It isFigure 1 Structure diagram of the middle side plate assembly;

[0023] Figure 5 For Figure 4 Side view of the middle side plate assembly;

[0024] Figure 6 For Figure 4 Sectional view of the middle side plate assembly.

[0025] Explanation of part numbers

[0026] Box 1, enclosure 11, side plate assembly 2, first side plate 21, first inclined structure 211, first pressing position 212, second pressing position 213, first locking structure 214, second locking structure 215, second recess 216, second side plate 22, second inclined structure 221, first protrusion 222, bending part 223, second protrusion 224, and cell stack 3. DETAILED DESCRIPTION

[0027] The following specific embodiments illustrate the implementation of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0028] It should be understood that the structures, proportions, sizes, etc. shown in the drawings attached to the specification are only used to understand and read the content disclosed in the specification by those skilled in the art, and are not used to limit the implementation conditions of the present application, so they do not have technical substantive significance. Any modification of the structure, change of the proportion relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the specification are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship without substantial change of the technical content is also considered as the scope of the present application.

[0029] Reference Figures 1 to 3In some optional embodiments, the application provides a battery pack, which comprises a box 1, a side plate assembly 2 and a cell stack 3. The box 1 comprises a surrounding plate 11, the side plate assembly 2 comprises a first side plate 21 and a second side plate 22, and the cell stack 3 is sandwiched between two first side plates 21 and is installed in the box 1 together with the first side plate 21; the same cell stack 3 corresponds to two groups of side plate assemblies 2, and the two groups of side plate assemblies 2 are distributed on the opposite sides of the cell stack 3, that is, the same cell stack 3 is sandwiched between the two first side plates 21 of the two groups of side plate assemblies 2. There is a gap between the first side plate 21 and the surrounding plate 11, at least part of the second side plate 22 extends into the gap, and the second side plate 22 is in abutment with the first side plate 21 and the surrounding plate 11, respectively, to prevent the cell stack 3 and the side plate assembly 2 from shaking in the box 1.

[0030] Optionally, the first side plate 21 and the second side plate 22 are detachably connected, so that the first side plate 21 and the second side plate 22 can be loaded into the box 1 in sequence, and are convenient to connect together. Further, the first side plate 21 and the second side plate 22 are connected and fixed by a locking member; specifically, the locking member comprises a screw, and the connection is simple, convenient and firm.

[0031] Optionally, the bottom of the cell stack 2 and the bottom of the box 1 are fixed by structural adhesive, the cell stack 3 comprises a plurality of stacked cells, and the two groups of side plate assemblies 2 are distributed on the two sides of the cell stack 3 in the stacking direction of the plurality of cells; specifically, the side plate assembly 2 is in abutment with the large face side of the cell, and the large face side of the cell is the side with the largest surface area of the cell. Further, the cell comprises a soft-pack cell.

[0032] The battery pack of the above embodiment, the first side plate 21 and the second side plate 22 are separately arranged, so that the first side plate 21 can be loaded into the box 1 before the second side plate 22, the installation space is sufficient, and there can be a gap between the first side plate 21 and the surrounding plate 11, so that the tool can be smoothly loaded into the box 1 without excessive extrusion when the tool clamps and compresses the cell stack 3 into the box, the initial compression force provided by the tool is reduced, which is beneficial to the cell to maintain the theoretical width and be loaded into the box 1, and after being loaded into the box, the pressure does not need to be released, which reduces the risk of scratching between the bottom of the cell stack 3 and the structural adhesive, and improves the product quality of the battery pack.

[0033] Referring to Figure 1 , Figure 3 , Figure 5 and Figure 6In some optional embodiments, the first side plate 21 has a first inclined structure 211 on the side facing the second side plate 22, the spacing between the first inclined structure 211 and the surrounding plate 11 gradually decreases from top to bottom, and the second side plate 22 has a second inclined structure 221 matched with the first inclined structure 211, that is, the thickness of the first side plate 21 in the stacking direction of the plurality of battery cells gradually increases from top to bottom, and the thickness of the second side plate 22 in the stacking direction of the plurality of battery cells gradually decreases from top to bottom, so as to have an assembly guide effect, and the assembly is simple, convenient, and beneficial to generate a pre-tightening force in the assembly process, so that the second side plate 22 is tightly pressed against the first side plate 21 and the surrounding plate 11, avoiding the battery cell stack 3 from shaking in the box 1, and improving the structural stability of the battery pack.

[0034] Referring to Figures 1 to 6 In some optional embodiments, the first side plate 21 is provided with a first pressing position 212 and a second pressing position 213, the second side plate 22 is connected with the first side plate 21 and covers the second pressing position 213, and the second side plate 22 is staggered with the first pressing position 212.

[0035] Optionally, the first pressing position 212 is arranged at both ends of the first side plate 21, and the second pressing position 213 is arranged between the two ends of the first side plate 21. Further, the number of the second pressing position 213 is multiple, and the multiple second pressing positions 213 are distributed along the length direction of the first side plate 21, so that the force is uniform when the tooling clamps the first side plate 21, and the battery cell stack 3 and the first side plate 21 are more stable in the process of clamping into the box.

[0036] Optionally, the side of the first side plate 21 facing the second side plate 22 is locally concave to form the first pressing position 212 and the second pressing position 213, which is beneficial to the pressing positioning of the tooling clamping the first side plate 21, and the spacing between the first pressing position 212 and the second pressing position 213 and the surrounding plate 11 is larger than the spacing between other parts of the first side plate 21 and the surrounding plate 11, which is beneficial to providing sufficient clamping space for the tooling. Further, the second pressing position 213 is a first groove which is wide at the top and narrow at the bottom, and a part of the second side plate 22 is locally raised to form a first protrusion 222 matched with the first groove, and in the process of the second side plate 22 extending into the gap, the first protrusion 222 slides into the first groove from top to bottom, which facilitates the positioning and assembly between the second side plate 22 and the first side plate 21, and is beneficial to reduce the assembly positioning difficulty.

[0037] Optionally, the locking member comprises a first locking member, and the lower portion of the second pressing position 213 is provided with a first locking structure 214, and the first locking member is connected and locked with the first locking structure 214 through the second side plate 22. The first locking structure 214 is arranged at the second pressing position 213, and the layout is compact, the first locking member does not need to occupy other installation space, which is beneficial to improve the space utilization rate, thereby being beneficial to reduce the overall volume of the battery pack.

[0038] Optionally, the locking member comprises a second locking member, the top of the first side plate 21 is provided with a second locking structure 215, the top end of the second side plate 22 is bent to form a bent portion 223 which is pressed downward on the top end of the first side plate 21, and the second locking member is connected and locked with the second locking structure 215 through the bent portion 223. The bent portion 223 is beneficial to limit the depth of the second side plate 22 extending into the gap, has a limiting effect, avoids excessive extrusion on the first side plate 21, and the bent portion 223 is located outside the gap, which is also convenient for taking and placing the second side plate 22, and the assembly is more simple and convenient. Further, the top of the first side plate 21 is partially recessed to form a second groove 216, the second locking structure 215 is arranged in the second groove 216, the bent portion 223 is partially raised to form a second protrusion 224 matched with the second groove 216, and the second locking member is connected and locked with the second locking structure 215 through the second protrusion 224. This structure design not only facilitates the assembly and positioning of the first side plate 21 and the second side plate 22, but also enables the second locking member to be installed in the space defined by the second protrusion 224 without protruding from the top end of the second side plate 22, without occupying other installation space, with compact layout, which is beneficial to improve the space utilization rate, thereby being beneficial to reduce the overall volume of the battery pack.

[0039] Specifically, in the assembly process, the two first side plates 21 are fixed on both sides of the cell stack 3, the tool clamps the first pressing position 212 and the second pressing position 213 on the two first side plates 21 to place the first side plate 21 and the cell stack 3 into the box body 1 together, the tool for pressing the first pressing position 212 is retained, the first pressing position 212 is continuously pressed, the clamping jaw of the tool for pressing the second pressing position 213 is withdrawn, and the second side plate 22 gradually abuts against the first side plate 21 and the surrounding plate 11 from top to bottom and extends into the gap. After the second side plate 22 is assembled in place, the first side plate 21 and the second side plate 22 are locked, the tool for pressing the first pressing position 212 is withdrawn, and the assembly is simple and convenient, which is beneficial to reduce the compression force on the cell stack 3 and facilitate the cell stack 3 into the box.

[0040] The battery pack of the above embodiment is provided with the first pressing position 212 and the second pressing position 213 on the first side plate 21, the stress points of clamping are increased, the stability of the first side plate 21 and the cell stack 3 in clamping, transferring and entering the box body 1 is improved, the first pressing position 212 is staggered with the second side plate 22, the second side plate 22 will not interfere with the first pressing position 212 and the corresponding tool when being loaded into the box body 1, so that the tool can continue to press the first pressing position 212, a stable installation environment is provided for loading of the second side plate 22, and the assembly efficiency and quality are improved.

[0041] The battery pack of the utility model discloses, through independently setting first side plate 21 and second side plate 22 make first side plate 21 and second side plate 22 can be loaded into box body 1 before and after, be favorable to provide enough installation space for the cell stack 3 into box, make the cell stack 3 can not need transition extrusion when loading into box body 1, the cell stack 3 does not need to release pressure after loading into box body 1, reduce the risk of the cell stack 3 and structural glue scratch, improve the product quality of battery pack.

[0042] In the description of the present specification, the description of the terms "the embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0043] The above embodiment is only illustrative of the principle and effect of the utility model, and is not used to limit the utility model. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A battery pack, characterized by, The utility model relates to a battery box, including: a box body including a surrounding board; a side plate assembly including a first side plate and a second side plate; an electric core stack sandwiched between two first side plates and installed in the box body together with the first side plates; wherein the first side plates have a gap with the surrounding board, at least part of the second side plate extends into the gap, and the second side plate abuts against the first side plate and the surrounding board respectively.

2. The battery pack of claim 1, wherein, The first side plate has a first inclined structure on the side facing the second side plate, the distance between the first inclined structure and the surrounding board gradually decreases from top to bottom, and the second side plate has a second inclined structure matched and attached to the first inclined structure.

3. The battery pack of claim 1, wherein, The first side plate is provided with a first pressing position and a second pressing position, the second side plate is connected with the first side plate and covers the second pressing position, and the second side plate is staggered with the first pressing position.

4. The battery pack of claim 3, wherein, The first pressing position is arranged at both ends of the first side plate, and the second pressing position is arranged between the two ends of the first side plate.

5. The battery pack of claim 3, wherein, The first side plate is locally concave on the side facing the second side plate to form the first pressing position and the second pressing position.

6. The battery pack of claim 5, wherein, The second pressing position is a first groove which is wide at the top and narrow at the bottom, and part of the second side plate is locally raised to form a first protrusion matched with the first groove.

7. The battery pack of any one of claims 3 to 6, wherein, The first side plate and the second side plate are connected and fixed by a locking member.

8. The battery pack of claim 7, wherein, The locking member includes a first locking member, the lower part of the second pressing position is provided with a first locking structure, and the first locking member is connected and locked with the first locking structure through the second side plate.

9. The battery pack of claim 7, wherein, The locking member includes a second locking member, the top of the first side plate is provided with a second locking structure, the top end of the second side plate is bent to form a bent part which is pressed down on the top end of the first side plate, and the second locking member is connected and locked with the second locking structure through the bent part.

10. The battery pack of claim 9, wherein, The top of the first side plate is locally recessed to form a second groove, the second locking structure is arranged in the second groove, part of the bent part is locally raised to form a second protrusion matched with the second groove, and the second locking member is connected and locked with the second locking structure through the second protrusion.

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