End plate structure with heat insulation effect and battery pack thereof

Abstract

The utility model discloses an end plate structure with a heat insulation effect and a battery pack thereof, the end plate structure comprises a first end plate part and a second end plate part which are connected into a whole, the first end plate part is positioned on one side close to a large surface of a battery cell, and the second end plate part is positioned on one side far away from the large surface of the battery cell; a cavity is formed in the end surface, facing the large surface of the battery cell, of the second end plate part, structural reinforcers for structural reinforcement are arranged in the cavity, and gaps between the structural reinforcers are filled with a heat insulation material for preventing heat loss. The end plate structure composed of the first end plate part and the second end plate part is arranged to be two parts so as to be convenient to manufacture, and in the cavity of the second end plate part, on one hand, the structural strength of the end plate structure is guaranteed by arranging the structural reinforcer, and on the other hand, heat loss is slowed down by arranging the heat insulation material, so that the heat insulation effect is improved. Therefore, the temperature difference between the battery cells in the whole battery pack is always in a permissible range, and the safety of the whole battery pack is improved.

Description

Technical Field

[0001] This utility model relates to the field of power batteries, specifically to an end plate structure with heat insulation effect and its battery pack. Background Technology

[0002] When commercial vehicle battery packs are used in low-temperature conditions, the lack of temperature control measures and insulation on the battery pack's top cover structure leads to rapid heat loss from the metal end plates near the battery pack boundaries. This causes the cell temperatures adjacent to the end plates to drop too quickly, resulting in a larger temperature difference between the cells within the entire battery pack.

[0003] A large temperature difference can trigger an alarm in the BMS (Battery Management System) for excessive temperature difference, causing the battery pack to stop outputting power. Furthermore, an excessive temperature difference between the cells within the battery pack can reduce the activity of the cooler cells, leading to a faster voltage drop in these cells during discharge. This results in an excessive voltage difference across the entire battery pack, which in turn triggers an alarm in the BMS for excessive voltage difference, causing the battery pack to stop outputting power.

[0004] Therefore, it is urgent to propose a new solution to the above problems. Summary of the Invention

[0005] This invention provides an end plate structure with heat insulation effect and its battery pack, which can solve the problem in the prior art that causes the metal end plate near the boundary of the battery pack to lose heat quickly, resulting in a large temperature difference between the cells inside the entire battery pack.

[0006] This utility model provides an end plate structure with heat insulation effect, including a first end plate part and a second end plate part connected as one piece, wherein the first end plate part is located on the side closer to the large surface of the battery cell, and the second end plate part is located on the side away from the large surface of the battery cell.

[0007] The second end plate has a cavity on its end face facing the large surface of the battery cell. The cavity is provided with structural reinforcement members for structural reinforcement, and the gaps between the structural reinforcement members are filled with heat insulation material to prevent heat loss.

[0008] Furthermore, the structural reinforcement includes a plurality of first reinforcing beam structures arranged along the length direction of the end plate, and a plurality of second reinforcing beam structures arranged along the width direction of the end plate.

[0009] Furthermore, the top ends of both the first and second reinforcing beam structures are flush with the top end of the side wall of the second end plate.

[0010] Furthermore, a single first reinforcing beam structure includes multiple spaced and collinear first reinforcing beams, and a single second reinforcing beam structure includes multiple spaced and collinear second reinforcing beams, with an injection hole for placing thermal insulation material at the upper end of the side wall.

[0011] Furthermore, the first end plate portion and the second end plate portion are connected by a plurality of bolt fasteners.

[0012] Furthermore, the thickness of the second end plate is 2 to 3 times the thickness of the first end plate.

[0013] Furthermore, the heat insulation material is polyurethane foam.

[0014] Furthermore, the end face of the second end plate portion away from the first end plate portion is provided with a placement groove for placing a cable tie.

[0015] Furthermore, the first end plate portion 1, the second end plate portion 2, and the structural reinforcement 4 are all made of aluminum.

[0016] This utility model also provides a battery pack, including the aforementioned end plate structure with heat insulation effect.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. This utility model provides an end plate structure consisting of a first end plate and a second end plate, which is made into two parts for easy manufacturing. In the cavity of the second end plate, structural reinforcement is provided to ensure the structural strength of the end plate structure, and heat insulation material is provided to slow down heat loss. This ensures that the temperature difference between the cells inside the battery pack is always within the permissible range, thereby improving the safety of the entire battery pack.

[0019] 2. The tops of the first and second reinforcing beam structures of this utility model are flush with the top of the side wall of the second end plate. This is beneficial to ensure that the entire end plate structure is subjected to consistent extrusion pressure from the cell expansion during later use, thereby ensuring that the entire end plate structure does not deform.

[0020] 3. The thickness of the second end plate of this utility model is 2 to 3 times the thickness of the first end plate. This arrangement ensures that the heat of the battery cell on the side close to the first end plate is dissipated too quickly. In addition, it also ensures the structural strength of the second end plate and prevents deformation under the action of the binding strap. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the end plate structure with heat insulation effect of this utility model;

[0022] Figure 2This is a schematic diagram of the overall structure of the second end plate of this utility model;

[0023] Figure 3 This is a schematic diagram of the overall structure of the second end plate of this utility model without heat insulation material;

[0024] Reference numerals: 1. First end plate; 2. Second end plate; 21. Side wall; 22. Injection hole; 23. Placement groove; 3. Cavity; 4. Structural reinforcement; 41. First reinforcing beam structure; 411. First reinforcing beam; 42. Second reinforcing beam structure; 421. Second reinforcing beam; 5. Bolt fastener; 6. Thermal insulation material. Detailed Implementation

[0025] To further understand the utility model's content, features, and effects, the following embodiments are provided, along with accompanying drawings. Figures 1-3 The details are as follows.

[0026] The end plate structure of this utility model is mainly used in commercial vehicles, and can also be used in battery packs without insulation or liquid cooling control measures. Figures 1-3 As shown, the end plate structure of this embodiment includes a first end plate portion 1 and a second end plate portion 2 connected as one piece, wherein the first end plate portion 1 is located on the side closer to the large surface of the battery cell, and the second end plate portion 2 is located on the side away from the large surface of the battery cell.

[0027] The second end plate 2 has a cavity 3 on the end face facing the large surface of the battery cell. The cavity 3 is provided with a structural reinforcement 4 for structural reinforcement. The gaps between the structural reinforcement 4 are filled with heat insulation material 6 to prevent heat loss. This can effectively reduce the heat loss of the part of the battery cell near the end plate and achieve the effect of heat insulation.

[0028] This utility model provides a two-part end plate structure consisting of a first end plate and a second end plate for easy manufacturing. In the cavity of the second end plate, structural reinforcement is provided to ensure the structural strength of the end plate structure, while heat insulation material is provided to slow down heat loss. This ensures that the temperature difference between the cells inside the battery pack is always within the permissible range, thereby improving the safety of the entire battery pack.

[0029] In this embodiment, as Figure 2 As shown, the structural reinforcement 4 includes three first reinforcing beam structures 41 arranged along the length direction of the end plate and five second reinforcing beam structures 42 arranged along the width direction of the end plate. The specific number can be adjusted according to actual needs. By setting the first and second reinforcing beam structures, it can be ensured that the first end plate will not deform due to the squeezing force of the battery cell expansion during later use.

[0030] In this embodiment, as Figure 3 As shown, the top ends of the first reinforcing beam structure 41 and the second reinforcing beam structure 421 are flush with the top end of the side wall 21 of the second end plate 2. This is beneficial to ensure that the entire end plate structure is subjected to consistent extrusion pressure from the cell expansion during later use, thereby ensuring that the entire end plate structure does not deform.

[0031] In this embodiment, as Figure 3 As shown, a single first reinforcing beam structure 41 includes multiple spaced and collinear first reinforcing beams 411, and a single second reinforcing beam structure 42 includes multiple spaced and collinear second reinforcing beams 421. The upper end of the side wall 21 is provided with an injection hole 22 for placing the heat insulation material 6. The spaced arrangement facilitates the filling of the entire cavity by the heat insulation material 6.

[0032] In this embodiment, as Figure 1 As shown, the first end plate 1 and the second end plate 2 are connected by four bolts 5. The four corners of the first end plate 1 have through holes for the bolts 5 to pass through.

[0033] In this embodiment, the thickness of the second end plate 2 is 2.5 times the thickness of the first end plate 1, or other values ​​between 2 and 3 times can be used. This setting ensures that the heat of the battery cell on the side close to the first end plate is dissipated too quickly, and also ensures the structural strength of the second end plate to prevent deformation under the action of the binding strap.

[0034] In this embodiment, the heat insulation material 6 is a polyurethane foam material, which has a simple structure and can save costs.

[0035] In this embodiment, as Figure 3 As shown, the end face of the second end plate 2 away from the first end plate 1 is provided with a placement groove 23 for placing the cable tie, which facilitates the arrangement of the cable tie.

[0036] In this embodiment, the first end plate 1, the second end plate 2, and the structural reinforcement 4 are all made of aluminum, which is lightweight and facilitates heat transfer.

[0037] This utility model also provides a battery pack, including the aforementioned end plate structure with heat insulation effect.

[0038] The above-described utility model only illustrates the implementation methods of the present utility model and should not be construed as limiting the scope of the utility model patent, nor is it a limitation on the structure of the present utility model embodiments in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present utility model embodiments, and these all fall within the protection scope of the present utility model embodiments.

Claims

1. An end plate structure with heat insulation effect, characterized in that: It includes a first end plate portion (1) and a second end plate portion (2) connected as one piece, wherein the first end plate portion (1) is located on the side closer to the large surface of the battery cell, and the second end plate portion (2) is located on the side away from the large surface of the battery cell; The second end plate (2) has a cavity (3) on the end face facing the large surface of the cell. A structural reinforcement member (4) for structural reinforcement is provided in the cavity (3). The gap between the structural reinforcement members (4) is filled with heat insulation material (6) for preventing heat loss.

2. The end plate structure with heat insulation effect according to claim 1, characterized in that: The structural reinforcement (4) includes a plurality of first reinforcing beam structures (41) arranged along the length direction of the end plate, and a plurality of second reinforcing beam structures (42) arranged along the width direction of the end plate.

3. The end plate structure with heat insulation effect according to claim 2, characterized in that: The top ends of the first reinforcing beam structure (41) and the second reinforcing beam structure (421) are flush with the top end of the side wall (21) of the second end plate (2).

4. The end plate structure with heat insulation effect according to claim 3, characterized in that: Each first reinforcing beam structure (41) includes multiple spaced and collinear first reinforcing beams (411), and each second reinforcing beam structure (42) includes multiple spaced and collinear second reinforcing beams (421). The upper end of the sidewall (21) is provided with an injection hole (22) for placing the heat insulation material (6).

5. The end plate structure with heat insulation effect according to any one of claims 1 to 4, characterized in that: The first end plate (1) and the second end plate (2) are connected by a plurality of bolt fasteners (5).

6. The end plate structure with heat insulation effect according to any one of claims 1 to 4, characterized in that: The thickness of the second end plate portion (2) is 2 to 3 times the thickness of the first end plate portion (1).

7. The end plate structure with heat insulation effect according to any one of claims 1 to 4, characterized in that: The heat insulation material (6) is polyurethane foam.

8. The end plate structure with heat insulation effect according to any one of claims 1 to 4, characterized in that: The second end plate (2) has a placement groove (23) for placing a cable tie on its end face away from the first end plate (1).

9. The end plate structure with heat insulation effect according to any one of claims 1 to 4, characterized in that: The first end plate (1), the second end plate (2), and the structural reinforcement (4) are all made of aluminum.

10. A battery pack, characterized in that: Includes the end plate structure with heat insulation effect as described in any one of claims 1 to 9.

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