Fixing structure of battery cell and liquid cooling plate

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery cell and liquid cooling plate fixing structure which comprises a battery cell body, a liquid cooling plate and a bottom fixing plate, concave grooves are formed in the bottom of the battery cell body and the bottom of the liquid cooling plate, protrusions matched with the concave grooves are arranged on the side, close to the battery cell body, of the bottom fixing plate, and the protrusions are arranged on the bottom fixing plate. And the concave groove and the bulge form a concave-convex matched fixing structure. The bottom of the battery cell is designed into a concave dovetail groove, the contact bottom fixing plate at the bottom of the battery cell is designed into a convex dovetail groove, and the bottom dovetail groove and the battery cell dovetail groove are effectively matched and fixed. The liquid cooling plate is mounted on the bottom fixing plate in a quick-plug mounting manner, the liquid cooling plate is attached to the large surface of the battery cell, and meanwhile, the temperature of the quick-charging battery cell is quickly guided out through the liquid cooling plate. Therefore, the utility model can effectively solve the problems of complex process, low efficiency, high cost, low energy density and the like of the conventional CTP (computer to plate) large-surface liquid cooling gluing mode, and is favorable for heat dissipation at the bottom of the battery core and effective exhaust of waste gas.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a fixing structure of a battery core and a liquid cooling plate. Background Art

[0002] The large-surface liquid cooling of existing CTP (Cell to Pack) batteries is achieved through a large-surface liquid cooling plate. The battery cell and the liquid cooling plate are bonded together by a thermally conductive structural adhesive, and the cooling medium circulates inside the large-surface liquid cooling plate, thereby quickly taking away the heat generated by the fast-charging cell.

[0003] The existing conventional CTP battery large-surface liquid cold plate gluing mode has complex procedures, low efficiency and high cost. The biggest problem is the complexity of subsequent after-sales repairs and the complexity of the subsequent glue recycling process of the battery system.

[0004] In addition, the existing conventional battery cells do not use thermoelectric separation technology, and the battery cells and liquid cooling plates are bonded together by thermally conductive structural adhesive, which is not conducive to heat dissipation at the bottom of the battery cells and effective exhaust gas discharge. Utility Model Content

[0005] The purpose of the utility model is to provide a fixing structure of a battery cell and a liquid cooling plate, which can solve the technical problems of complex installation, low efficiency and high cost of the battery cell and the liquid cooling plate, and is conducive to heat dissipation at the bottom of the battery cell and effective exhaust of exhaust gas.

[0006] In order to achieve the above-mentioned purpose, the utility model is designed to fix a battery cell and a liquid cooling plate, comprising a battery cell body, a liquid cooling plate, and a bottom fixing plate, wherein the battery cell body and the liquid cooling plate are both arranged on the bottom fixing plate and connected to the bottom fixing plate through a fixing structure;

[0007] The bottoms of the battery cell body and the liquid cooling plate are both provided with concave grooves, and the bottom fixing plate is provided with a protrusion matching the concave groove on one side close to the battery cell body, and the concave groove and the protrusion form a concave-convex matching fixing structure.

[0008] As a preferred solution, the concave groove and the protrusion are both arranged along the length direction of the battery cell body.

[0009] Furthermore, the concave groove and the protrusion are both trapezoidal structures, the concave groove is closer to the bottom fixing plate than the concave groove away from the bottom fixing plate, and the protrusion is shorter than the protrusion close to the battery body.

[0010] Furthermore, an explosion-proof valve is provided at the bottom of the concave groove of the battery cell body.

[0011] Furthermore, the protrusion is provided with an air and heat conducting groove.

[0012] Furthermore, the air and heat conducting grooves are arranged along the length direction of the battery core body.

[0013] Furthermore, the air and heat conducting grooves extend from the top of the protrusions to the bottom of the bottom fixing plate.

[0014] As a preferred solution, there are two liquid cooling plates, which are symmetrically arranged at both ends of the bottom fixing plate, and a mounting groove is formed between the two liquid cooling plates and the bottom fixing plate, and the battery cell body is arranged in the mounting groove.

[0015] Furthermore, the liquid cooling plate is provided with liquid cooling flow channel holes along its length direction.

[0016] As a preferred solution, a cell cover is provided on the top of the cell body, and a cell pole is provided on the cell cover.

[0017] Beneficial effects of the utility model:

[0018] The utility model provides a fixing structure of a battery cell and a liquid cooling plate, which is designed with a concave dovetail groove at the bottom of the battery cell, and a raised dovetail groove at the bottom of the battery cell contacting the bottom fixing plate, so that the bottom dovetail groove and the battery cell dovetail groove are effectively matched and fixed. The liquid cooling plate is installed on the bottom fixing plate by a quick-insert installation method, and the liquid cooling plate is fitted with the large surface of the battery cell, and the temperature of the fast-charging battery cell is quickly exported through the liquid cooling plate.

[0019] Therefore, the utility model can effectively solve the problem that the CTP fast charging cell large-surface liquid cooling PACK package needs to be glued, and can also effectively solve the problems of the conventional CTP large-surface liquid cooling glue-applying mode, such as complex process, low efficiency, high cost, low energy density, etc. The biggest problem is the complexity of subsequent after-sales repair and the complexity of the subsequent glue processing process for battery system recycling. At the same time, it is conducive to the heat dissipation at the bottom of the battery cell and the effective discharge of exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0021] Figure 2 It is a bottom-view explosion schematic diagram of the utility model.

[0022] Figure 3 It is a partial structural schematic diagram of the utility model.

[0023] Description of reference numerals:

[0024] 1-battery cell pole; 2-liquid cooling plate; 3-battery cell cover; 5-liquid cooling channel hole; 6-battery cell body; 7-protrusion; 8-explosion-proof valve; 9-concave groove; 10-gas and heat conduction groove; 11-installation hole; 12-bottom fixing plate; 13-installation groove. DETAILED DESCRIPTION

[0025] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0026] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] This utility model takes the CTP (Cell to Pack) square shell fast charging battery as an example to introduce the fixing structure of the battery cell and the liquid cooling plate. This utility model mainly designs a concave dovetail groove on the bottom of the battery cell, and designs the bottom of the battery cell contacting the bottom fixing plate as a convex dovetail groove design, so that the bottom dovetail groove and the battery cell dovetail groove are effectively matched and fixed.

[0029] like Figures 1 to 3As shown, the utility model provides a fixing structure of a battery cell and a liquid cooling plate, including a battery cell body 6, a liquid cooling plate 2, and a bottom fixing plate 12. The battery cell body 6 and the liquid cooling plate 2 are both arranged on the bottom fixing plate 12, and are connected to the bottom fixing plate 12 by a fast plug installation method through a fixing structure; the bottoms of the battery cell body 6 and the liquid cooling plate 2 are both provided with a concave groove 9, and the bottom fixing plate 12 is provided with a protrusion 7 matching the concave groove 9 on one side close to the battery cell body 6, and the concave groove 9 and the protrusion 7 form a concave-convex matching fixing structure. A battery cell cover plate 3 is provided on the top of the battery cell body 6, and a battery cell pole 1 is provided on the battery cell cover plate 3.

[0030] There are two liquid cooling plates 2, which are symmetrically arranged at both ends of the bottom fixing plate 12. A mounting groove 13 is formed between the two liquid cooling plates 2 and the bottom fixing plate 12, and the battery cell body 6 is arranged in the mounting groove 13. The liquid cooling plate 2 is provided with liquid cooling channel holes 5 along its length direction, and there are multiple liquid cooling channel holes 5, which are respectively arranged in parallel along the height direction of the liquid cooling plate 2. The large surfaces of the liquid cooling plates are respectively in contact with the large surfaces of the battery cell body.

[0031] like Figure 3 As shown, the concave groove 9 and the protrusion 7 are both arranged along the length direction of the battery cell body 6. The concave groove 9 and the protrusion 7 are both trapezoidal structures, and the opening of the concave groove 9 close to the bottom fixing plate 12 is smaller than the opening of the concave groove 9 away from the bottom fixing plate 12, and the length of the protrusion 7 away from the battery cell body 6 is shorter than the length of the protrusion 7 close to the battery cell body 6. An explosion-proof valve 8 is provided at the bottom of the concave groove 9 of the battery cell body 6. An air-conducting and heat-conducting groove 10 is provided on the protrusion 7. The air-conducting and heat-conducting groove 10 is arranged along the length direction of the battery cell body 6. The air-conducting and heat-conducting groove 10 extends from the top of the protrusion 7 to the bottom of the bottom fixing plate 12, and four mounting holes 11 connected to the PACK box are provided at the bottom of the fixing plate 12.

[0032] The key points of the utility model are: CTP large-surface liquid cooling PACK does not require gluing; CTP is quickly integrated and assembled; CTP battery cells and liquid cooling plates are fixed by dovetail groove design; the battery cells are designed with an explosion-proof valve structure at the bottom; the thermoelectric graded dovetail groove is quickly designed and integrated; and an air and heat conduction groove is designed at the bottom of the dovetail groove.

[0033] When performing CTP assembly of battery cells, the battery cells are effectively assembled by placing them outside the battery PACK box, and then the assembly consisting of the CTP battery cell bottom fixing parts and the battery cells is assembled into the CTP battery pack box. After that, the convex and concave dovetail groove structural features are designed at the bottom of the large-surface liquid cooling plate in the same way as above, and the liquid cooling plate is installed on the bottom fixing plate in the same quick-insert installation method. The liquid cooling plate is fitted with the large surface of the battery cell, and the temperature of the fast-charging cell is quickly exported through the liquid cooling plate.

[0034] This solution can effectively solve the problem of the need to glue the large-surface liquid-cooled PACK package of CTP fast-charging cells. It can also effectively solve the problems of complex processes, low efficiency, high costs, and low energy density in the conventional CTP large-surface liquid-cooled gluing mode. The biggest problem is the complexity of subsequent after-sales repairs and the complexity of the subsequent glue processing process for recycling the battery system.

[0035] At the same time, by designing and arranging an explosion-proof valve at the concave dovetail groove at the bottom of the battery cell, and designing and arranging a thermoelectric separation gas and heat conduction groove on the concave dovetail groove that cooperates with the bottom fixing plate of the battery cell, when thermal runaway of the battery cell occurs, the explosion-proof valve of the battery cell opens, and the heat and exhaust gas are discharged through the concave gas and heat conduction groove installed on the bottom fixing plate of the battery cell, so as to effectively discharge the heat and exhaust gas of the battery cell when thermal runaway occurs, thereby ensuring the safety of the battery cell pack and avoiding thermal runaway of the battery.

[0036] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A fixing structure of a battery cell and a liquid cooling plate, characterized in that: It comprises a battery cell body (6), a liquid cooling plate (2), and a bottom fixing plate (12), wherein the battery cell body (6) and the liquid cooling plate (2) are both arranged on the bottom fixing plate (12) and connected to the bottom fixing plate (12) via a fixing structure; The bottoms of the battery cell body (6) and the liquid cooling plate (2) are both provided with a concave groove (9), and the bottom fixing plate (12) is provided with a protrusion (7) on one side close to the battery cell body (6), and the concave groove (9) and the protrusion (7) form a concave-convex matching fixing structure.

2. The fixing structure of a battery cell and a liquid cooling plate according to claim 1, characterized in that: The concave groove (9) and the protrusion (7) are both arranged along the length direction of the battery cell body (6).

3. The fixing structure of a battery cell and a liquid cooling plate according to claim 2, characterized in that: The concave groove (9) and the protrusion (7) are both trapezoidal structures; the side of the concave groove (9) close to the bottom fixing plate (12) is smaller than the side of the concave groove (9) away from the bottom fixing plate (12); and the side of the protrusion (7) away from the battery cell body (6) is shorter than the side of the protrusion (7) close to the battery cell body (6).

4. The fixing structure of a battery cell and a liquid cooling plate according to claim 3, characterized in that: An explosion-proof valve (8) is provided at the bottom of the concave groove (9) of the battery cell body (6).

5. The fixing structure of a battery cell and a liquid cooling plate according to claim 4, characterized in that: The protrusion (7) is provided with an air and heat conducting groove (10).

6. The fixing structure of a battery cell and a liquid cooling plate according to claim 5, characterized in that: The air and heat conducting grooves (10) are arranged along the length direction of the battery core body (6).

7. The fixing structure of a battery cell and a liquid cooling plate according to claim 6, characterized in that: The air and heat conducting groove (10) extends from the top of the protrusion (7) to the bottom of the bottom fixing plate (12).

8. A fixing structure of a battery cell and a liquid cooling plate according to any one of claims 1 to 7, characterized in that: The liquid cooling plates (2) are in two pieces, and the two liquid cooling plates (2) are symmetrically arranged at the two ends of the bottom fixing plate (12). A mounting groove (13) is formed between the two liquid cooling plates (2) and the bottom fixing plate (12), and the battery cell body (6) is arranged in the mounting groove (13).

9. The fixing structure of a battery cell and a liquid cooling plate according to claim 8, characterized in that: The liquid cooling plate (2) is provided with liquid cooling flow channel holes (5) along its length direction.

10. The fixing structure of a battery cell and a liquid cooling plate according to claim 1, characterized in that: A cell cover plate (3) is provided on the top of the cell body (6), and a cell pole (1) is provided on the cell cover plate (3).

Images