Battery pack, power utilization device and energy storage device

Abstract

The utility model provides a battery pack, electricity utilization device and energy storage device, the battery pack of the utility model comprises a first battery cell module and a second battery cell module which are arranged side by side, the first battery cell module and the second battery cell module are connected through a coupling structure, the coupling structure comprises a first coupling plate arranged at the side part of the first battery cell module, and a second coupling plate arranged at the side part of the second battery cell module; the first coupling plate is arranged at the side part of the first battery cell module, the second coupling plate is arranged at the side part of the second battery cell module, one of the first coupling plate and the second coupling plate is provided with a coupling part, the other one of the first coupling plate and the second coupling plate is provided with a coupling matching part matched with the coupling part, and the coupling part is inserted into the coupling matching part to form coupling connection of the first coupling plate and the second coupling plate. According to the battery pack disclosed by the utility model, the problem that the strength of the battery pack can be improved only by increasing the height and the wall thickness of the shell of the battery pack in the prior art is effectively solved, so that the overall strength of the battery pack is effectively improved on the premise of ensuring the same energy density.

Description

Technical Field

[0001] The utility model relates to the technical field of battery modules, and in particular to a battery pack. At the same time, the utility model also relates to an electrical device provided with the battery pack, and an energy storage device provided with the battery pack. Background Art

[0002] With the increasing popularity of new energy vehicles, more and more vehicles are adopting new energy technologies, and higher requirements are also placed on the mechanical properties of battery packs. Battery packs must have a sturdy and reliable structure, while being ultra-light and ensuring extremely high energy density.

[0003] In the existing technology, in order to ensure structural strength, the battery pack structure is often reinforced by increasing the shell height, increasing the shell wall thickness, adding horizontal and longitudinal beams, etc. Although this method can effectively enhance the structural strength of the battery pack, it will also increase the extra weight while greatly sacrificing the energy density of the battery pack, thereby affecting the vehicle's mileage. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery pack, which can enhance the structural strength of the battery pack while increasing the energy density of the battery pack.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] A battery includes a first battery cell module and a second battery cell module arranged side by side, wherein the first battery cell module and the second battery cell module are connected via a coupling structure.

[0007] In which, the coupling structure includes a first coupling plate arranged on the side of the first battery cell module, and a second coupling plate arranged on the side of the second battery cell module, one of the first coupling plate and the second coupling plate is provided with a coupling portion, and the other of the first coupling plate and the second coupling plate is provided with a coupling mating portion adapted to the coupling portion, and the coupling portion is inserted into the coupling mating portion to form a coupling connection between the first coupling plate and the second coupling plate.

[0008] Furthermore, the coupling portion includes a plurality of coupling protrusions provided on the first coupling plate, and the plurality of coupling protrusions are arranged through the first coupling plate along the height direction of the battery pack; the coupling mating portion includes a plurality of coupling grooves provided on the second coupling plate, and each coupling protrusion is respectively inserted into the corresponding coupling groove.

[0009] Furthermore, the projection of each coupling protrusion in the height direction of the battery pack is trapezoidal.

[0010] Furthermore, the projections of each coupling protrusion in the height direction of the battery pack are isosceles trapezoidal; each of the projections has a top edge a, a bottom edge b whose length is smaller than that of the top edge a, and two side edges c arranged between the top edge a and the bottom edge b, and the angle α between each side edge c and the bottom edge b is between 3° and 88°.

[0011] Furthermore, the projection of each coupling protrusion in the height direction of the battery pack includes a straight edge and an arc edge connected at both ends of the straight edge; the protrusion size of each coupling protrusion is between the radius size r and the diameter size d of the arc edge, or the central angle of the arc edge is greater than 180°.

[0012] Furthermore, the first coupling plate is adhesively connected to the first battery cell module and / or the second coupling plate is adhesively connected to the second battery cell module.

[0013] Furthermore, the projection of each coupling protrusion in the height direction of the battery pack is T-shaped.

[0014] Furthermore, the first coupling plate and the second coupling plate are both metal plates or non-metal plates.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The battery pack described in the present invention connects the two battery modules to each other by adding a coupling structure to the side wall of the existing battery module, effectively connecting the two originally independent battery modules into a whole, so that the two battery modules support and pull each other, thereby improving the overall structural strength of the battery pack. At the same time, the coupling structure effectively utilizes the installation gap between the two existing battery modules without occupying additional space, which is beneficial to the improvement of the energy density of the entire pack, thereby making the entire pack have better product quality and market competitiveness.

[0017] Secondly, multiple coupling protrusions are arranged along the height direction of the battery pack through the first coupling plate, and each coupling protrusion is inserted into the corresponding coupling groove, so that when the staff connects the coupling protrusion with the coupling groove, the positioning and installation of the second battery cell module can be completed at the same time, making the operation more convenient.

[0018] In addition, the projections of the coupling protrusions in the height direction of the battery pack are all trapezoidal. After the coupling protrusions are connected to the coupling grooves, the angle of the trapezoid can limit the two coupling plates, preventing the two coupling plates from moving away from each other in the horizontal direction, making the connection more reliable.

[0019] In addition, the projections of the coupling protrusions in the height direction of the battery pack are all isosceles trapezoids, which makes it easier to ensure the consistency of the processing of the coupling protrusions and improve the processing quality. The angle α between the side c and the bottom b is between 3 and 88 degrees, ensuring the formation of a limit while having good structural strength and facilitating processing.

[0020] Another object of the present invention is to provide an electrical device equipped with the aforementioned battery pack. Furthermore, another object of the present invention is to provide an energy storage device equipped with the aforementioned battery pack. The electrical device, energy storage device, and battery pack described in the present invention have the same beneficial effects as those of the prior art and are not further elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Figure 1 This is a schematic structural diagram of a battery pack according to an embodiment of the present utility model;

[0023] Figure 2 This is a schematic structural diagram of the battery module according to an embodiment of the present utility model;

[0024] Figure 3 This is a schematic structural diagram of the coupling structure according to an embodiment of the present utility model;

[0025] Figure 4 This is a structural diagram of the coupling portion according to an embodiment of the present utility model;

[0026] Figures 5 to 7 Schematic diagram of another structure of the coupling structure according to an embodiment of the present utility model;

[0027] Description of reference numerals:

[0028] 1. Battery module; 101. Battery cell; 102. Module cover; 103. Module end plate; 104. Cable tie; 105. Heating film;

[0029] 2. Coupling structure; 201. First coupling plate; 202. Second coupling plate; 203. Coupling protrusion; 204. Coupling groove;

[0030] 3. Top edge a; 301. Bottom edge b; 302. Side edge c;

[0031] 401. Straight edge; 402. Arc edge. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0037] Example 1

[0038] This embodiment relates to a battery pack, including a first battery cell module 1 and a second battery cell module 1 arranged side by side, and the first battery cell module 1 and the second battery cell module 1 are connected via a coupling structure 2.

[0039] In terms of overall structure, Figures 1 to 5 As shown, the coupling structure 2 in this embodiment includes a first coupling plate 201 provided on the side of the first battery cell module 1, and a second coupling plate 202 provided on the side of the second battery cell module 1. A coupling portion is provided on one of the first coupling plate 201 and the second coupling plate 202, and a coupling mating portion adapted to the coupling portion is provided on the other of the first coupling plate 201 and the second coupling plate 202. The coupling portion is inserted into the coupling mating portion to couple the first coupling plate 201 and the second coupling plate 202.

[0040] At this time, as set above, by adding a coupling structure 2 on the side wall of the existing battery module 1, the two battery modules 1 can be connected to each other, and the two originally independent battery modules 1 can be effectively connected into a whole, so that the two battery modules 1 support and pull each other, thereby improving the overall structural strength of the battery pack. At the same time, the coupling structure 2 effectively utilizes the installation gap between the two existing battery modules 1 without occupying additional space, which can be beneficial to the improvement of the energy density of the whole package, thereby making the whole package have better product quality and market competitiveness.

[0041] Based on the above overall introduction, in detail, in this embodiment, in the specific implementation, each battery module 1 includes multiple battery cells 101, a module cover 102, and two module end plates 103. The multiple battery cells 101 are arranged along the length direction of the battery cell module 1. The two module end plates 103 are respectively arranged on both sides of the length direction of the battery cell module 1 and are connected by two cable ties 104. The module cover 102 is arranged on the top of the multiple battery cells 101 and is connected to the multiple battery cells 101, so that the battery cell module 1 becomes a structurally stable whole.

[0042] In addition, since the performance of the battery cell 101 is greatly affected by temperature, the internal resistance of the battery will increase at low temperatures, affecting the discharge capacity of the battery. Therefore, a heating film 105 is also provided on the battery cell 101 on both sides of the width direction of the battery cell module 1. The battery cell 101 is heated to a suitable operating temperature by the heating film 105, which can improve the discharge capacity and energy density of the battery.

[0043] Furthermore, the first and second cell modules 1 and 1 of the battery pack in this application are split-type designs. Compared with the integrated cell module 1 design, the integrated design is too heavy and difficult to carry and install. The split-type cell module 1 design can also infinitely expand the number of connected cell modules 1 by using the coupling structure 2, making it easier to carry and install. At the same time, the relevant structural parts not mentioned in the battery pack of this embodiment can refer to the various structures of battery packs well known to those skilled in the art and will not be described in detail here.

[0044] In this embodiment, as a preferred implementation form, see Figure 2 and Figure 3 As shown, the coupling portion includes multiple coupling protrusions 203 provided on the first coupling plate 201. These protrusions 203 are arranged along the height of the battery pack and extend through the first coupling plate 201. Simultaneously, the coupling mating portion includes multiple coupling grooves 204 provided on the second coupling plate 202. Each coupling protrusion 203 is inserted into a corresponding coupling groove 204. Furthermore, the coupling protrusions 203 are spaced apart along the length of the first coupling plate 201, while the coupling grooves 204 are spaced apart along the length of the second coupling plate 202.

[0045] When installing the first battery cell module 1, first adjust the position of the first battery cell module 1, and then lower the first battery cell module 1 along its height direction onto the mounting base. The mounting base is provided with an adhesive so that the battery cell module 1 and the mounting base are bonded to ensure that the battery cell module 1 and the mounting base will not separate when the electrical equipment is moved.

[0046] Then, when installing the second battery cell module 1, align the coupling groove 204 on the second battery cell module 1 with the coupling protrusion 203 on the first battery cell module 1, and then lower the second battery cell module 1 along its height direction onto the mounting base. At this time, while completing the installation of the second battery cell module 1, each coupling protrusion 203 is respectively inserted into the corresponding coupling groove 204, which not only improves the overall structural strength of the battery pack, but also maintains the original assembly convenience of the battery cell module 1. There is no need to change the original assembly relationship and production line configuration, and it is fully compatible with existing processes and production methods.

[0047] It is worth noting that the coupling plate is arranged on the side of the battery cell 101, biased towards the upper end of the battery cell 101, and the length of the coupling plate is adapted to the length of the battery cell module 1. Combined with the adhesive on the mounting base, it can better improve the overall strength of the battery pack, avoiding collision with the upper end of the battery cell module 1 when the electrical device is moved, affecting the normal use of the battery pack, and enabling the battery pack to adapt to more severe usage environments.

[0048] In addition, in this embodiment, a coupling portion and a coupling matching portion may be arranged at intervals on the first coupling plate 201, and a coupling matching portion adapted to the coupling portion and a coupling portion matching the coupling matching portion may be arranged at intervals on the second coupling plate 202, which can also effectively connect the two originally independent battery cell modules 1 into a whole, thereby improving the overall structural strength of the battery pack.

[0049] Furthermore, in this embodiment, as a preferred implementation form, see Figure 3 As shown, the projection of each coupling protrusion 203 in the height direction of the battery pack is trapezoidal. After the coupling protrusion 203 is connected to the coupling groove 204, the angle of the trapezoid can limit the two coupling plates, preventing the two coupling plates from moving away from each other in the horizontal direction, making the connection more reliable. In addition, the trapezoidal shape has a certain guiding effect during insertion, facilitating the smooth insertion of the coupling protrusion 203 into the coupling groove 204. The trapezoidal design of the coupling protrusion 203 also provides stronger shear resistance when the coupling protrusion 203 is inserted into the coupling groove 204. Because the bottom side of the trapezoid is larger than the top side, the contact area between the coupling protrusion 203 and the coupling groove 204 is increased, enhancing the stability of the connection.

[0050] Specifically, in this embodiment, as a preferred implementation form, see Figure 4 As shown, the projection of each coupling protrusion 203 in the height direction of the battery pack is an isosceles trapezoid. Each projection has a top edge a3, a bottom edge b301 that is shorter than the top edge a3, and two side edges c302 disposed between the top edge a3 and the bottom edge b301. The angle α between each side edge c302 and the bottom edge b301 is between 3° and 88°.

[0051] The side of the coupling protrusion 203 corresponding to the top edge a3 is connected to the first coupling plate 201, and the isosceles trapezoidal design makes the coupling protrusion 203 and the coupling groove 204 fit more tightly, reduces the gap between the coupling protrusion 203 and the coupling groove 204, and enhances the tightness of the connection. Figure 4 and Figure 6 The dotted line segment in FIG. 2 is the connection portion between the coupling protrusion 203 and the first coupling plate 201 .

[0052] In addition, in this embodiment, as a preferred implementation form, see Figure 5 and Figure 6 As shown, the projection of each coupling protrusion 203 in the height direction of the battery pack includes a straight edge 401 and an arc edge 402 connecting the two ends of the straight edge 401. The protrusion size of each coupling protrusion 203 is between the radius r and the diameter R of the arc edge 402, or the central angle of the arc edge 402 is greater than 180°.

[0053] It should be noted that the side of the coupling protrusion 203 corresponding to the straight edge 401 is connected to the first coupling plate 201, and the design of the arc edge 402 reduces burrs generated during processing, improving the surface finish of the coupling structure 2. It also better disperses stress between the coupling protrusion 203 and the coupling groove 204, reducing stress concentration, improving connection reliability, and further extending the service life of the coupling structure 2. Furthermore, by setting the protrusion size of each coupling protrusion 203 between the radius r and diameter d of the arc edge 402, or by setting the central angle of the arc edge 402 to be greater than 180°, a position limit is formed between the coupling protrusion 203 when inserted into the coupling groove 204, preventing the first coupling plate 201 and the second coupling plate 202 from separating in the direction of arrangement of the two battery cell modules (i.e., the horizontal direction).

[0054] Secondly, in this embodiment, as a preferred implementation form, see Figure 6 As shown, the projections of each coupling protrusion 203 in the height direction of the battery pack are T-shaped. The T-shaped coupling protrusion 203 can provide a larger contact area, thereby enhancing the connection strength between adjacent battery modules and improving the stability of the overall structure.

[0055] In addition, in this embodiment, as a preferred implementation form, the first coupling plate 201 is adhesively connected to the first battery module 1, and the second coupling plate 202 is adhesively connected to the second battery module 1. Adhesive connection can simplify the assembly process, eliminating the need for additional mechanical fasteners and reducing assembly time. Moreover, the adhesive connection provides a more secure connection between the coupling plate and the battery module 1, enhancing the structural stability of the entire battery pack.

[0056] Furthermore, in this embodiment, as a preferred implementation form, both the first coupling plate 201 and the second coupling plate 202 are metal plates or non-metal plates. Both the first coupling plate 201 and the second coupling plate 202 are metal plates, which provide the first coupling plate 201 and the second coupling plate 202 with high mechanical strength and hardness. Furthermore, metal materials generally have good thermal conductivity, effectively conducting away heat generated by the battery cells 101, thereby facilitating thermal management of the battery pack.

[0057] Similarly, the first coupling plate 201 and the second coupling plate 202 may also be made of other non-metallic plates with high strength and hardness and certain thermal stability, so that the coupling connection between the two coupling plates is reliable and will not be deformed due to the heat of the battery cell 101, affecting the overall strength of the battery pack.

[0058] Example 2

[0059] This embodiment relates to an electric device, which is equipped with the battery pack of embodiment 1. In a specific implementation, the electric device can be an electric vehicle or a hybrid vehicle.

[0060] The electric device of this embodiment, by assembling the battery pack of the first embodiment, can have a better endurance and better practicality.

[0061] In addition, this embodiment also relates to an energy storage device, which is equipped with the battery pack of embodiment 1. By assembling the battery pack of embodiment 1, the energy storage device can have higher structural strength without reducing energy density, thereby having better practicality.

[0062] 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 pack, characterized in that: The battery module comprises a first battery cell module and a second battery cell module arranged side by side, wherein the first battery cell module and the second battery cell module are connected via a coupling structure; The coupling structure includes a first coupling plate arranged on the side of the first battery cell module, and a second coupling plate arranged on the side of the second battery cell module. One of the first coupling plate and the second coupling plate is provided with a coupling portion, and the other of the first coupling plate and the second coupling plate is provided with a coupling mating portion adapted to the coupling portion. The coupling portion is inserted into the coupling mating portion to form a coupling connection between the first coupling plate and the second coupling plate.

2. The battery pack according to claim 1, wherein: The coupling portion includes a plurality of coupling protrusions provided on the first coupling plate, and the plurality of coupling protrusions are arranged through the first coupling plate along the height direction of the battery pack; The coupling fitting portion includes a plurality of coupling grooves provided on the second coupling plate, and each coupling protrusion is inserted into the corresponding coupling groove.

3. The battery pack according to claim 2, wherein: The projection of each coupling protrusion in the height direction of the battery pack is trapezoidal.

4. The battery pack according to claim 3, wherein: The projection of each coupling protrusion in the height direction of the battery pack is an isosceles trapezoid; Each of the projected portions has a top edge a, a bottom edge b whose length is smaller than that of the top edge a, and two side edges c arranged between the top edge a and the bottom edge b, and the angle α between each side edge c and the bottom edge b is between 3° and 88°.

5. The battery pack according to claim 2, wherein: The projection of each coupling protrusion in the height direction of the battery pack includes a straight edge and arc edges connecting the two ends of the straight edge; The protrusion size of each coupling protrusion is between the radius size r and the diameter size d of the arc edge, or the central angle of the arc edge is greater than 180°.

6. The battery pack according to claim 2, wherein: The projection of each coupling protrusion in the height direction of the battery pack is T-shaped.

7. The battery pack according to claim 1, wherein: The first coupling plate is adhesively connected to the first battery core module; and / or, The second coupling plate is adhesively connected to the second battery cell module.

8. The battery pack according to any one of claims 1 to 7, characterized in that: The first coupling plate and the second coupling plate are both metal plates or non-metal plates.

9. An electrical device, characterized in that: The electrical device is provided with the battery pack according to any one of claims 1 to 8.

10. An energy storage device, characterized in that: The energy storage device is provided with a battery pack according to any one of claims 1 to 8.

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