Battery cell monomer and battery pack

Abstract

The utility model provides a battery cell monomer and a battery pack, and the battery cell monomer comprises a battery cell body, an insertion part is arranged on one large surface of the battery cell body in the thickness direction, and an insertion matching part matched with the insertion part in an insertion manner is arranged on the other large surface of the battery cell body in the thickness direction; and when two adjacent battery cell monomers are stacked, the insertion part on one battery cell monomer is inserted into the insertion matching part of the other battery cell monomer. According to the battery cell monomer disclosed by the utility model, the battery cell monomer can be directly stacked in a battery pack or a vehicle body, so that the stacking efficiency is favorably improved, the cost of a stacking tool and a transfer tool is saved, the cost is reduced, and meanwhile, the temperature acquisition precision of the battery cell monomer is favorably detected better; therefore, the assembly cost and efficiency of the battery pack are improved, and the charge-discharge performance of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a battery cell. Simultaneously, the utility model also relates to a battery pack provided with the battery cell. Background Art

[0002] During the design and development of new energy vehicle power battery packs, cell integration solutions are gradually being integrated with the vehicle. The CTC (Cell to Chassis) battery pack solution is currently a popular solution sought by major OEMs and battery manufacturers. However, the traditional cell structure of the CTC solution requires tooling for stacking and then transporting the cells to the vehicle chassis. This problem is not limited to the CTC solution, and other CTP (Cell to Pack) battery pack solutions also face this problem. This requires tooling for stacking and then transporting the cells. This requires both stacking and transfer tooling during the assembly process, resulting in high stacking costs and low stacking efficiency, which is not conducive to increasing production line capacity. Utility Model Content

[0003] In view of this, the present invention aims to provide a battery cell monomer, which can improve the stacking efficiency of the battery pack and reduce the stacking cost.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0005] A battery cell monomer, comprising a battery cell body;

[0006] A plug-in portion is provided on one large surface of the battery cell body in the thickness direction, and a plug-in mating portion for mating with the plug-in portion is provided on another large surface of the battery cell body in the thickness direction;

[0007] When two adjacent battery cells are stacked, the plug-in portion on one of the battery cells is plugged into the plug-in matching portion of the other battery cell.

[0008] Furthermore, the plug-in portion includes a plug-in protrusion provided on the battery cell body, and the plug-in fitting portion includes a plug-in groove provided on the battery cell body.

[0009] Furthermore, in the thickness direction of the battery cell body, a protruding dimension d of the plugging protrusion is larger than a concave dimension c of the plugging groove.

[0010] Furthermore, in the length direction of the battery cell body, the width dimension b of the plugging protrusion is smaller than the width dimension a of the plugging groove.

[0011] Furthermore, a temperature detection unit for detecting the temperature of the battery cell is provided on the inner wall of the plug-in groove.

[0012] Furthermore, the inner wall of the plug-in groove includes a bottom wall and a side wall, and the temperature detection unit is provided on at least one of the bottom wall and the side wall.

[0013] Furthermore, the temperature detection units are multiple and spaced apart along the height direction of the battery cell body.

[0014] Furthermore, a spacing dimension S is formed between two adjacent temperature detection units, and in the height direction of the battery cell body, at least part of the spacing dimension S is gradually increased or gradually decreased; and / or, in the height direction of the battery cell body, the setting position of each temperature detection unit is located in the area of ​​2% to 98% of the large surface height.

[0015] Furthermore, the temperature detection units are multiple and spaced apart, and in the thickness direction of the battery cell, the connection line of the multiple temperature detection units is fan-shaped or elliptical.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The battery cell described in the present invention, by respectively arranging the plug-in portion and the plug-in fitting portion on the two large surfaces of the battery cell body, can make it possible for the plug-in portion on one battery cell to be directly plugged into the plug-in fitting portion of the other battery cell when two adjacent battery cells are stacked. In this way, the battery cells can be directly stacked inside the battery pack or the vehicle body, which is not only conducive to improving the stacking efficiency, but also helps to save the cost of stacking tooling and transfer tooling, thereby realizing a cost-reducing design.

[0018] Furthermore, the plug-in portion utilizes a protrusion, while the mating portion utilizes a recess. This results in a simple structure, facilitates the design and manufacture of battery cells, and offers low production costs. In the thickness direction of the battery cell, the protrusion (d) is larger than the recess (c) of the recess. In the length direction of the battery cell, the protrusion's width (b) is smaller than the recess's width (a). This ensures a sufficient gap between adjacent battery cells, achieving isolation and insulation between the cells and optimizing heat dissipation, ensuring the safety of each cell.

[0019] In addition, the temperature detection unit is arranged in the plug-in groove, that is, arranged on the large surface of the battery cell body, so that the collected temperature information can be closer to the internal temperature of the battery cell, which is conducive to fully utilizing the charge and discharge performance of each battery cell. The temperature detection unit is arranged on at least one of the bottom wall and the side wall, and the structure of the plug-in groove can be fully utilized to arrange the temperature detection unit. A spacing dimension S is formed between two adjacent temperature detection units, and in the height direction of the battery cell body, at least part of the spacing dimension S is gradually increased or gradually decreased, which can make the battery cell spacing similar to a step-like distribution, which is more in line with the battery cell temperature collection requirements.

[0020] Furthermore, the temperature detection units are positioned within 2% to 98% of the height of the main surface of the battery cell, which helps improve temperature acquisition accuracy. Multiple temperature detection units are arranged at intervals, and the connecting lines of the multiple temperature detection units form a fan or elliptical shape in the thickness direction of the battery cell, which also helps improve the temperature acquisition accuracy of each battery cell.

[0021] Another object of the present invention is to provide a battery pack, in which the battery cell as described above is provided.

[0022] The battery pack described in the present invention and the above-mentioned battery cell monomer have the same beneficial effects as the traditional technology, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 This is a schematic structural diagram of a battery cell according to an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the structure of stacked battery cells according to an embodiment of the present invention;

[0026] Figure 3 A top view of a battery cell according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the first structure of the temperature detection unit and the battery cell according to an embodiment of the present utility model when assembled;

[0028] Figure 5 This is a second structural diagram of the temperature detection unit and the battery cell according to an embodiment of the present utility model when assembled;

[0029] Figure 6 This is a third structural diagram of the temperature detection unit and the battery cell according to an embodiment of the present utility model when assembled;

[0030] Description of reference numerals:

[0031] 10. Battery cell body;

[0032] 11. Large surface; 111. Insertion protrusion; 112. Insertion groove; 1121. Bottom wall; 1122. Side wall;

[0033] 12. Top surface; 13. Temperature detection unit. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0035] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0036] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0037] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connection," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] Example 1

[0040] This embodiment relates to a battery cell, which has an overall structure such as Figures 1 to 6 As shown, the battery cell of this embodiment includes a battery body 10. A plug-in portion is provided on one large surface 11 of the battery body 10 in the thickness direction, and a mating portion for mating with the plug-in portion is provided on another large surface 11 of the battery body 10 in the thickness direction. When two adjacent battery cells are stacked, the plug-in portion of one battery cell is mated to the mating portion of the other battery cell.

[0041] At this time, as set above, by respectively setting the plug-in portion and the plug-in fitting portion on the two large surfaces 11 of the battery cell body 10, it is possible to make it possible for the plug-in portion on one battery cell to be directly plugged into the plug-in fitting portion of the other battery cell when two adjacent battery cells are stacked. In this way, the battery cells can be directly stacked inside the battery pack or the vehicle body, which is not only beneficial to improving the stacking efficiency, but also beneficial to saving the cost of stacking tooling and transfer tooling, thereby realizing cost reduction design.

[0042] Based on the overall introduction above, in detail, in this embodiment, during specific implementation, the battery cell body 10 includes a top surface 12 and a bottom surface, and four side surfaces arranged between the top surface 12 and the bottom surface. Among the four side surfaces, there is a group of large surfaces 11 with a larger side area, and the area of ​​the other group of two relatively arranged side surfaces is smaller than that of the large surfaces 11. The large surface 11 of the battery cell body 10 in this embodiment refers to the side surface with a larger area mentioned here.

[0043] At the same time, it should be noted that the expressions related to directions in this embodiment are merely illustrative descriptions of this embodiment. In specific implementation, the directions in this embodiment vary depending on the orientation of the battery cells. That is, the directions in this embodiment refer to a relative coordinate system based on the battery cells.

[0044] In this embodiment, as a preferred implementation form, Figure 1 and Figure 2 As shown, the plug-in portion includes a plug-in protrusion 111 provided on the battery cell body 10, and the plug-in mating portion includes a plug-in groove 112 provided on the battery cell body 10. The plug-in portion uses the plug-in protrusion 111 and the plug-in mating portion uses the plug-in groove 112, which simplifies the structure, facilitates the design and manufacture of the battery cell, and reduces the manufacturing cost.

[0045] In a specific implementation, the insertion protrusion 111 and the insertion groove 112 of this embodiment are aligned in the thickness direction of the battery cell body 10 , and the insertion protrusion 111 and the insertion groove 112 are both located in the middle of the large surface 11 in the length direction of the battery cell body 10 .

[0046] Secondly, in this embodiment, as a preferred implementation form, see Figure 3 As shown, in the thickness direction of the cell body 10, the protruding dimension d of the insertion protrusion 111 is greater than the recessed dimension c of the insertion groove 112. At the same time, and also as a preferred embodiment, in the length direction of the cell body 10, the width dimension b of the insertion protrusion 111 is less than the width dimension a of the insertion groove 112.

[0047] It can be understood that in the thickness direction of the battery cell body 10, the protruding dimension d of the plug-in protrusion 111 is larger than the concave dimension c of the plug-in groove 112, and in the length direction of the battery cell body 10, the width dimension b of the plug-in protrusion 111 is smaller than the width dimension a of the plug-in groove 112, which can ensure the battery cell gap between two adjacent battery cell units, realize the isolation and insulation performance between each battery cell unit and optimize the heat dissipation performance, which is conducive to ensuring the safety of use of each battery cell unit.

[0048] Furthermore, since the width dimension b of the insertion protrusion 111 is smaller than the width dimension a of the insertion groove 112 , the battery cells can form a certain floating amount in the length direction of the battery cell body 10 when stacked, which is beneficial for the battery cell boxing operation.

[0049] In addition, in this embodiment, as a preferred implementation form, see Figures 4 to 6 As shown, a temperature detection unit 13 for detecting the temperature of the battery cells is provided on the inner wall of the insertion groove 112. The placement of the temperature detection unit 13 in the insertion groove 112, i.e., on the large surface 11 of the battery cell body 10, enables the collected temperature information to be closer to the internal temperature of the battery cells, thereby facilitating full utilization of the charge and discharge performance of each battery cell.

[0050] At this time, in this embodiment, as a preferred implementation form, the inner wall of the plug-in groove 112 includes a bottom wall 1121 and a side wall 1122, and the temperature detection unit 13 is arranged on at least one of the bottom wall 1121 and the side wall 1122, that is, the temperature detection unit 13 can be arranged alone on the bottom wall 1121, or alone on the side wall 1122. Of course, the temperature detection unit 13 can also be arranged on both the bottom wall 1121 and the side wall 1122. The advantage of such an arrangement is that the structure of the plug-in groove 112 can be fully utilized to arrange the temperature detection unit 13.

[0051] It is worth mentioning that the temperature detection unit 13 here can adopt a temperature sensor for collecting battery cell temperature that is well known to those skilled in the art, such as a thin film sensor, and when it is set on the side wall 1122 of the plug-in groove 112, it can avoid being squeezed and damaged by two adjacent battery cell units.

[0052] Based on the consideration of the temperature detection accuracy of the battery cell, in this embodiment, Figure 4 As shown, as a preferred embodiment, the temperature detection units 13 are multiple and spaced apart along the height direction of the battery cell body 10 . Specifically, for example, the temperature detection units 13 are four, five or six and spaced apart along the height direction of the battery cell body 10 .

[0053] In specific implementation, in this embodiment, as a preferred implementation form, a spacing dimension S is formed between two adjacent temperature detection units 13, and in the height direction of the battery cell body 10, at least part of the spacing dimension S is gradually increased or gradually decreased, so that the battery cell spacing is distributed in a step-like manner, which is more in line with the battery cell temperature collection requirements.

[0054] At the same time, in this embodiment, as a preferred implementation form, in the height direction of the battery cell body 10, the setting position of each temperature detection unit 13 is located in the area of ​​2% to 98% of the height of the large surface 11. This setting is conducive to each temperature detection unit 13 covering most areas of the large surface 11 of the battery cell unit, which is conducive to improving the temperature collection accuracy.

[0055] In addition, in this embodiment, as a preferred implementation form, Figure 5 and Figure 6 As shown in the figure, the temperature detection units 13 are arranged in a plurality of intervals, and the connection line of the plurality of temperature detection units 13 is fan-shaped or elliptical in the thickness direction of the battery cell. Similarly, the majority of the large surface 11 of each battery cell can be covered, which is conducive to improving the temperature acquisition accuracy of each battery cell.

[0056] The battery cells of this embodiment can not only realize direct stacking of battery cells inside the battery pack or vehicle body, thereby improving stacking efficiency, and saving costs of stacking tooling and transfer tooling, thereby achieving cost-reduction design, but also help improve the temperature collection accuracy of the battery cells, thereby improving the assembly cost and efficiency of the battery pack, as well as improving the charge and discharge performance of the battery pack.

[0057] Example 2

[0058] This embodiment relates to a battery pack, in which the battery cell unit in the first embodiment is provided.

[0059] The battery pack of this embodiment is provided with the battery cell unit in the first embodiment, which has the same beneficial effects as the conventional technology and will not be described in detail here.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery cell, characterized in that: Including the battery cell body; A plug-in portion is provided on one large surface of the battery cell body in the thickness direction, and a plug-in mating portion for mating with the plug-in portion is provided on another large surface of the battery cell body in the thickness direction; When two adjacent battery cells are stacked, the plug-in portion on one of the battery cells is plugged into the plug-in matching portion of the other battery cell.

2. The battery cell according to claim 1, characterized in that: The plug-in portion includes a plug-in protrusion provided on the battery cell body, and the plug-in fitting portion includes a plug-in groove provided on the battery cell body.

3. The battery cell according to claim 2, characterized in that: In the thickness direction of the battery cell body, a protruding dimension d of the plugging protrusion is greater than a concave dimension c of the plugging groove.

4. The battery cell according to claim 2, wherein: In the length direction of the battery cell body, the width dimension b of the plugging protrusion is smaller than the width dimension a of the plugging groove.

5. The battery cell according to any one of claims 2 to 4, characterized in that: A temperature detection unit for detecting the temperature of the battery cell is provided on the inner wall of the plug-in groove.

6. The battery cell according to claim 5, characterized in that: The inner wall of the inserting groove includes a bottom wall and a side wall, and the temperature detection unit is arranged on at least one of the bottom wall and the side wall.

7. The battery cell according to claim 5, characterized in that: The temperature detection units are multiple and spaced apart along the height direction of the battery cell body.

8. The battery cell according to claim 7, characterized in that: A spacing dimension S is formed between two adjacent temperature detection units, and in the height direction of the battery cell body, at least part of the spacing dimension S is gradually increased or gradually decreased; and / or, In the height direction of the battery core body, the setting position of each temperature detection unit is located in the area of ​​2% to 98% of the height of the large surface.

9. The battery cell according to claim 6, characterized in that: The temperature detection units are arranged in a plurality at intervals, and in the thickness direction of the battery cell, the connection line of the plurality of temperature detection units is fan-shaped or elliptical.

10. A battery pack, characterized in that: The battery pack is provided with the battery cell according to any one of claims 1 to 9.

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