Battery pack

Abstract

This utility model relates to a battery pack, including a housing, a liquid cooling plate, and a battery module. A receiving cavity is formed within the housing, and both the liquid cooling plate and the battery module are disposed within the receiving cavity. A first mounting groove is provided on one side of the liquid cooling plate, and a first insulating sheet is provided at the bottom of the first mounting groove. Second insulating sheets are provided on at least one of the remaining sides of the liquid cooling plate at positions contacting the housing. One end of the battery module is inserted into the first mounting groove, and the side of the liquid cooling plate facing away from the battery module is mounted on the cavity wall of the receiving cavity. This structure provides double insulation protection for the battery module. When the battery module bulges, leaks, or fails due to high-temperature testing, causing the first insulating sheet to fail, the second insulating sheet can provide insulation and isolation, ensuring the safety performance of the entire battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] With increasingly severe energy and environmental problems, and the growing maturity of key technologies for power batteries, power batteries have been widely used in products such as electric vehicles, electric bicycles, and mobile communication terminals. In practical applications, power batteries primarily store energy for various electrical products in the form of battery packs. One existing battery pack mainly includes a metal casing, a liquid cooling plate installed inside the metal casing, and battery modules. The metal casing needs to have high mechanical strength to prevent mechanical deformation of the battery pack under external forces. The battery modules store electrical energy. The liquid cooling plate is installed inside the metal casing, and the battery modules are mounted on the liquid cooling plate for heat dissipation. To achieve insulation between the battery modules and the external environment, an insulating sheet is usually placed between the liquid cooling plate and the battery modules.

[0003] Existing technologies have the following shortcomings: When leakage occurs in the battery cells of the battery module, the electrolyte flows onto the liquid cooling plate, causing corrosion and damage to the insulating sheets, or the electrolyte flows directly along the gaps to the surface of the metal casing, leading to insulation failure between the battery module and the metal casing. Alternatively, during charging and discharging, the battery cells expand and compress the insulating sheets, causing damage and resulting in insulation failure between the battery module and the metal casing. Furthermore, during thermal runaway testing of the battery pack, the insulating sheets on the liquid cooling plate are damaged by the high temperature of the battery module, also leading to insulation failure between the battery module and the metal casing, thus reducing the safety performance of the battery pack. Utility Model Content

[0004] The purpose of this invention is to provide a battery pack with good insulation and high safety.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery pack is provided, including a housing, a liquid cooling plate, and a battery module. A receiving cavity is formed inside the housing. The liquid cooling plate and the battery module are both disposed in the receiving cavity. A first mounting groove is provided on one side of the liquid cooling plate. A first insulating sheet is provided at the bottom of the first mounting groove. A second insulating sheet is provided on the other side of the liquid cooling plate. One end of the battery module is inserted into the first mounting groove. The side of the liquid cooling plate opposite to the battery module is mounted on the cavity wall of the receiving cavity.

[0007] Furthermore, the housing includes a base and an upper cover disposed on the base. The base includes a bottom plate and a frame surrounding the periphery of the bottom plate. The bottom plate and the upper cover form the receiving cavity. The liquid cooling plate is mounted on the bottom plate and fixed by the frame.

[0008] Furthermore, the frame includes a first frame, a second frame, and two third frames, the two third frames being spaced apart, the first frame and the second frame being spaced apart between the two third frames, and the second frame and the two third frames forming a second mounting groove for inserting the liquid cooling plate, the first frame being spaced apart from the base plate to form an opening, through which the liquid cooling plate can be inserted into the second mounting groove.

[0009] Furthermore, the base also includes a fixing member located on the side of the opening opposite to the second mounting groove, and the fixing member abuts against the liquid cooling plate.

[0010] Furthermore, the fastener includes a mounting plate and a limiting plate vertically disposed at one end of the mounting plate. The mounting plate is detachably connected to the base plate via a first fastener, and the limiting plate abuts against the liquid cooling plate.

[0011] Furthermore, there are two first frames, which are spaced apart between the two third frames, and the liquid cooling plate is sandwiched between the first frames and the base plate.

[0012] Furthermore, the battery module is mounted on the base by a second fastener, which passes through the first frame and the liquid cooling plate.

[0013] Furthermore, the first insulating sheet and / or the second insulating sheet are insulating resin sheets.

[0014] Furthermore, the first insulating sheet and / or the second insulating sheet are bonded and fixed to the liquid cooling plate.

[0015] Furthermore, the liquid cooling plate is provided with an inlet pipe and an outlet pipe for connecting to an external liquid supply device. The inlet pipe and the outlet pipe pass through the housing, and both the inlet pipe and the outlet pipe are insulating pipes.

[0016] The beneficial effects of this invention are as follows: By setting a first insulating sheet between the liquid cooling plate and the battery module, and a second insulating sheet between the liquid cooling plate and the casing, the battery module is provided with double insulation protection. When the battery module bulges, leaks, or fails due to high-temperature testing, the second insulating sheet can still be used to provide insulation between the battery module and the casing, thus ensuring the safety performance of the entire battery pack. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the battery pack according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the battery pack according to an embodiment of the present invention (top cover removed).

[0019] Figure 3 for Figure 2 Enlarged view of point A in the image.

[0020] Figure 4 This is a schematic diagram of the base according to an embodiment of the present utility model.

[0021] Figure 5 This is a schematic diagram of the liquid cooling plate according to an embodiment of the present invention.

[0022] Figure 6 This is a cross-sectional view of the liquid cooling plate according to an embodiment of the present invention.

[0023] In the picture:

[0024] 1. Housing; 11. Base; 110. Base plate; 1101. First mounting hole; 111. First frame; 112. Second frame; 113. Third frame; 114. Opening; 115. Second mounting hole; 116. Second mounting groove; 117. Fixing component; 1171. Mounting plate; 1172. Limiting plate; 12. Top cover; 121. Flanged edge; 2. Liquid cooling plate; 21. Heat exchange plate; 22. Enclosure plate; 23. First mounting groove; 24. Third mounting hole; 25. Liquid inlet pipe; 26. Liquid outlet pipe; 3. Battery module; 31. Power terminal; 4. First insulating sheet; 5. Second insulating sheet. Detailed Implementation

[0025] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 6As shown, this embodiment provides a battery pack including a housing 1, a liquid cooling plate 2, and a battery module 3. The battery module 3 is the energy storage component, composed of several cells connected in series or parallel. The liquid cooling plate 2 utilizes liquid circulation for heat exchange to dissipate heat from the battery module 3. The housing 1 provides installation space and mechanical protection for the liquid cooling plate 2 and the battery module 3. The housing 1 is made of metal to provide good mechanical strength. The housing 1 has a rectangular hollow structure, with an internal cavity for mounting the liquid cooling plate 2 and the battery module 3. The length direction of the housing 1 is the X direction shown in the figure, the width direction is the Y direction shown in the figure, and the height direction is the Z direction shown in the figure. The liquid cooling plate 2 and the battery module 3 are installed within the cavity of the housing 1. A first mounting groove 23 is provided on one side of the liquid cooling plate 2 along its thickness direction (i.e., the height direction of the housing 1), and one end of the battery module 3 is inserted into the first mounting groove 23. A first insulating sheet 4 is provided at the bottom of the first mounting groove 23, so that the battery module 3 and the liquid cooling plate 2 are separated by the first insulating sheet 4. The side of the liquid cooling plate 2 facing away from the battery module 3 is installed on one of the cavity walls of the receiving cavity inside the housing 1. A second insulating sheet 5 is provided at least at the position in contact with the housing on the other sides of the liquid cooling plate 2, excluding the side corresponding to the first mounting groove 23. In this embodiment, the liquid cooling plate 2 is installed at the bottom of the receiving cavity. The side of the liquid cooling plate 2 facing away from the battery module 3, the two end faces of the liquid cooling plate 2 in the length direction (i.e., the length direction of the housing 1), and the two end faces of the liquid cooling plate 2 in the width direction (i.e., the width direction of the housing 1) are all provided with the second insulating sheet 5. The function of the second insulating sheet 5 is to insulate and isolate the liquid cooling plate 2 from the housing 1. Of course, in some embodiments, the second insulating sheet 5 can also be provided on all the outer sides of the liquid cooling plate.

[0027] Understandably, the liquid cooling plate 2 is made of metal to provide it with good thermal conductivity and mechanical strength. Because the liquid cooling plate 2 is insulated from the battery module 3 by the first insulating sheet 4, and from the housing 1 by the second insulating sheet 5, the battery module 3 receives double insulation protection from both the first and second insulating sheets 4 and 5. Even when the first insulating sheet 4, which is in direct contact with the battery module 3, is damaged by the high temperature of a thermal runaway test, by the bulging and compression of the battery module 3, or by corrosion from electrolyte leakage, the second insulating sheet 5 can still prevent insulation failure between the battery module 3 and the housing 1, thus ensuring the safety of the entire battery pack. Furthermore, since the second insulating sheet 5 is installed on the side of the liquid cooling plate 2 facing away from the battery module 3, the heat energy of the battery module 3 is absorbed by the liquid cooling plate 2 during a thermal runaway test, thus preventing the second insulating sheet 5 from being damaged by the high temperature of the battery module 3. Meanwhile, since the liquid cooling plate 2 is provided with a first mounting groove 23, when the battery module 3 leaks, the electrolyte can be collected by the first mounting groove 23, preventing the electrolyte from flowing to the inner surface of the housing 1, thereby preventing the battery module 3 from being connected to the housing 1 through the electrolyte.

[0028] Specifically, the first insulating sheet 4 and the second insulating sheet 5 are insulating resin sheets. The first insulating sheet 4 and the second insulating sheet 5 are bonded and fixed to the surface of the liquid cooling plate 2.

[0029] Specifically, the housing 1 includes a base 11 and a top cover 12. The top cover 12 is disposed on the base 11, forming a receiving cavity between the top cover 12 and the base 11. The base 11 includes a base plate 110 and a frame surrounding the periphery of the base plate 110. A liquid cooling plate 2 is mounted on the base plate 110, and the liquid cooling plate 2 is located within the frame, and the liquid cooling plate 2 is fixed to the base plate 110 by the frame. The top cover 12 includes a cover body and a flange 121 disposed at one end of the cover body, the flange 121 being used for mounting screws. The edge of the frame is spaced from the periphery of the base plate 110, and the flange 121 abuts between the edge of the frame and the edge of the base plate 110, and the flange 121 is fixed to the base plate 110 by screws. The top cover 12 has a hollow structure, and the end of the top cover 12 with the flange 121 is connected to the periphery of the base plate 110. When the top cover 12 is installed together with the base 11, the frame on the base plate 110 is inserted into the top cover. At least two opposite sides of the frame abut against the inner wall of the top cover 12. This structure improves the stability of the installation between the base 11 and the top cover 12. Correspondingly, a first mounting hole 1101 for mounting screws is provided between the edge of the frame and the periphery of the base plate 110.

[0030] The frame includes a first frame 111, a second frame 112, and two third frames 113. The two third frames 113 are parallel and spaced apart along the width direction of the base plate 110 (i.e., the width direction of the housing 1), and the first frame 111 and the second frame 112 are parallel and spaced apart along the length direction of the base plate 110 (i.e., the length direction of the housing 1). The two ends of the first frame 111 are connected to the ends of the two third frames 113, and the two ends of the second frame 112 are connected to the ends of the two third frames 113. The first frame 111, the second frame 112, and the two third frames 113 form a rectangular frame structure, allowing the entire frame to surround the periphery of the liquid cooling plate 2. A second mounting groove 116 for inserting the liquid cooling plate 2 is formed between the second frame 112 and the two third frames 113. The second frame 112 and the third frame 113 are both connected and fixed to the base plate 110. The first frame 111 is spaced apart from the base plate 110 so that an opening 114 is formed between the first frame 111 and the base plate 110 for the liquid cooling plate 2 to pass through. When installing the liquid cooling plate 2, the liquid cooling plate 2 is inserted into the second mounting groove 116 through the opening 114 so that the liquid cooling plate 2 is fixed to the base plate 110 by the frame.

[0031] Specifically, the base 11 also includes a fixing member 117, which is used to confine the liquid cooling plate 2 within the second mounting groove 116. The fixing member 117 is L-shaped and includes a mounting plate 1171 and a limiting plate 1172 vertically disposed at one end of the mounting plate 1171. The fixing member 117 is mounted on the base plate 110, and the fixing member 117 is located on the side of the opening 114 opposite to the second mounting groove 116. The mounting plate 1171 is detachably connected to the base plate 110 by a first fastener, which can be a bolt, screw, etc. The limiting plate 1172 abuts against the end of the liquid cooling plate 2 near the opening 114 to confine the liquid cooling plate 2 within the second mounting groove 116. When installing the liquid cooling plate 2, the liquid cooling plate 2 is inserted into the second mounting groove 116 through the opening 114, and then the fixing member 117 is installed, with the limiting plate 1172 abutting against the liquid cooling plate 2 to prevent the liquid cooling plate 2 from exiting from the opening 114.

[0032] Specifically, two first frame frames 111 are provided to limit the thickness of the liquid cooling plate 2. The two first frame frames 111 are parallel and spaced apart between the two third frame frames 113, with the liquid cooling plate 2 sandwiched between the first frame frames 111 and the base plate 110. One of the two first frame frames 111 is located at the opening of the second mounting groove 116, i.e., this first frame frame 111 is spaced apart from the base plate 110 to form an opening 114. The other first frame frame 111 is located at the bottom of the second mounting groove 116, and this first frame frame 111 is connected and fixed to the second frame frame 112. This first frame frame 111 also serves to improve the mechanical strength of the entire frame. After the liquid cooling plate 2 is inserted into the second mounting groove 116, both ends of the liquid cooling plate 2 in the length direction are respectively sandwiched between the two first frame frames 111 and the base plate 110, thereby limiting the thickness of the liquid cooling plate 2.

[0033] The battery module 3 is mounted on the base 11 using a second fastener. The second fastener can be a bolt, screw, or stud. To further improve the installation stability of the battery module 3, one end of the battery module 3 is inserted into the first mounting groove 23 of the liquid cooling plate 2, and then mounted to the base 11 using the second fastener. The second fastener also passes through both the first frame 111 in the base 11 and the liquid cooling plate 2. Because the battery module 3, the liquid cooling plate 2, and the base 11 are connected together, it helps to improve the structural stability and mechanical strength of the entire battery pack. Correspondingly, the two first frame frames 111 have second mounting holes 115 for mounting the second fastener. Both ends of the liquid cooling plate 2 along its length are provided with third mounting holes 24 for mounting the second fastener. The number and position of the second mounting holes 115 and the third mounting holes 24 are correspondingly set. After the liquid cooling plate 2 is inserted into the second mounting slot 116, the third mounting hole 24 on the liquid cooling plate 2 is located below the second mounting hole 115 on the first frame 111, and the corresponding second mounting hole 115 and third mounting hole 24 are aligned. The second fastener passes through the battery module 3, the second mounting hole 115 and the third mounting hole 24 from top to bottom to achieve the installation and fixation of the battery module 3.

[0034] Specifically, the liquid cooling plate 2 includes a heat exchange plate 21 and a surrounding plate 22 surrounding the periphery of the heat exchange plate 21, forming a first mounting groove 23 between the heat exchange plate 21 and the surrounding plate 22. A first insulating sheet 4 is attached to the heat exchange plate 21. The liquid cooling plate 2 is provided with an inlet pipe 25 and an outlet pipe 26 for connecting to an external liquid supply device. The heat exchange plate 21 of the liquid cooling plate 2 has a heat dissipation channel for the flow of coolant, and the inlet pipe 25 and the outlet pipe 26 are respectively connected to the two ends of the heat dissipation channel. The coolant in the external liquid supply device circulates in the heat dissipation channel to achieve heat exchange. The inlet pipe 25 and the outlet pipe 26 pass through the upper cover 12 of the housing 1. To ensure insulation between the liquid cooling plate 2 and the housing 1, both the inlet pipe 25 and the outlet pipe 26 are insulating pipes to prevent the liquid cooling plate 2 from communicating with the housing 1 through the inlet pipe 25 or the outlet pipe 26.

[0035] The battery module 3 is provided with a power terminal 31, which is inserted through the upper cover 12 so that external electrical equipment can be electrically connected to the battery module 3 through the power terminal 31.

[0036] The beneficial effects of this embodiment are as follows: By setting a first insulating sheet 4 between the liquid cooling plate 2 and the battery module 3, and setting a second insulating sheet 5 between the liquid cooling plate 2 and the housing 1, the battery module 3 is provided with double insulation protection. When the battery module 3 bulges, leaks, or fails due to high temperature testing, the second insulating sheet 5 can still be used to provide insulation between the battery module 3 and the housing 1, thus ensuring the safety performance of the entire battery pack.

[0037] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery pack, characterized by, The device includes a housing, a liquid cooling plate, and a battery module. A receiving cavity is formed inside the housing. The liquid cooling plate and the battery module are both disposed within the receiving cavity. A first mounting groove is provided on one side of the liquid cooling plate. A first insulating sheet is provided at the bottom of the first mounting groove. A second insulating sheet is provided on at least one of the remaining sides of the liquid cooling plate at a position in contact with the housing. One end of the battery module is inserted into the first mounting groove. The side of the liquid cooling plate opposite to the battery module is mounted on the cavity wall of the receiving cavity.

2. The battery pack according to claim 1, characterized in that, The housing includes a base and an upper cover disposed on the base. The base includes a bottom plate and a frame surrounding the periphery of the bottom plate. The bottom plate and the upper cover form the receiving cavity. The liquid cooling plate is mounted on the bottom plate and fixed by the frame. One end of the upper cover is connected to the periphery of the bottom plate. The frame is inserted into the upper cover and confined within the upper cover.

3. The battery pack according to claim 2, characterized in that, The frame includes a first frame, a second frame, and two third frames. The two third frames are spaced apart. The first frame and the second frame are spaced apart between the two third frames. The second frame and the two third frames form a second mounting groove for inserting the liquid cooling plate. The first frame is spaced apart from the base plate to form an opening, through which the liquid cooling plate can be inserted into the second mounting groove.

4. The battery pack according to claim 3, characterized in that, The base also includes a fixing member located on the side of the opening opposite to the second mounting groove, and the fixing member abuts against the liquid cooling plate.

5. The battery pack according to claim 4, characterized in that, The fastener includes a mounting plate and a limiting plate vertically disposed at one end of the mounting plate. The mounting plate is detachably connected to the base plate via a first fastener, and the limiting plate abuts against the liquid cooling plate.

6. The battery pack according to claim 3, characterized in that, There are two first frames, which are spaced apart between the two third frames, and the liquid cooling plate is sandwiched between the first frames and the base plate.

7. The battery pack according to claim 6, characterized in that, The battery module is mounted on the base by a second fastener, which passes through the first frame and the liquid cooling plate.

8. The battery pack according to claim 1, characterized in that, The first insulating sheet and / or the second insulating sheet are insulating resin sheets.

9. The battery pack according to claim 1, characterized in that, The first insulating sheet and / or the second insulating sheet are bonded and fixed to the liquid cooling plate.

10. The battery pack according to claim 1, characterized in that, The liquid cooling plate is provided with an inlet pipe and an outlet pipe for connecting to an external liquid supply device. The inlet pipe and the outlet pipe pass through the housing and are both insulating pipes.

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