Battery pack

Abstract

The utility model discloses a battery pack which comprises a first cold water plate, a second cold water plate, connecting pieces and a plurality of battery cell modules, each battery cell module is provided with a pole, one end of each connecting piece is connected with the pole of the corresponding battery cell module, the other end of each connecting piece is connected with the pole of the adjacent battery cell module, and external threads are arranged on the peripheral wall of each pole. One end, far away from the battery cell module, of the pole column is connected with a screw plug in a matched manner, the first cold water plate is arranged at the bottom of the battery cell module, the second cold water plate is arranged between the top of the battery cell module and the screw plug, and the second cold water plate is provided with a first through hole for the pole column to penetrate through. The first cold water plate is arranged at the bottom of the battery cell module, and the second cold water plate is arranged at the top of the battery cell module, so that the cooling surface of the battery cell module is increased, and the safety of the battery is improved. In addition, the pole columns are integrated in the top second cold water plate in a bolt mode, the high integration or complete module-free technology of the battery pack is achieved, the battery module assembling link is omitted, and then the production efficiency from the battery to the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to battery pack. BACKGROUND

[0002] With the market share of new energy vehicles gradually increasing, energy storage systems are also constantly being market demand hot, in the background of the current new energy continues to expand, the battery is one of all new energy minimum units, new energy vehicles and energy storage cannot do without the support of battery technology, the heat dissipation problem of battery becomes the bottleneck of new energy. Generally speaking, complex and diverse electrochemical reactions will occur inside the battery during charging and discharging, and the internal resistance of the battery will also increase with the increase of charging rate and cycle, resulting in increased heat generation and temperature rise in the battery, when the temperature exceeds the limit temperature of the battery, thermal runaway occurs, and the battery may leak, catch fire, explode and cause various hazards. Therefore, the heat dissipation problem of the battery itself has become an urgent technical problem to be solved. Chinese patent CN202110836622.8 discloses a CTP battery pack and a car, the bottom of the battery module is attached to the bottom plate of the box through heat-conducting adhesive, and the bottom of the box is provided with a liquid cooling flow channel to heat or cool the battery module. However, the liquid cooling flow channel in the scheme is only installed at the bottom of the box, and the cooling efficiency is low and the cooling time is long. SUMMARY

[0003] In view of the technical problem that the liquid cooling flow channel is only installed at the bottom of the box, resulting in low cooling efficiency, the utility model provides a battery pack, and the pole is integrated in the top second cold water plate in a bolted manner, thereby improving the cooling efficiency.

[0004] The technical scheme adopted by the utility model is as follows: a battery pack, comprising a first cold water plate, a second cold water plate, a connecting sheet and a plurality of battery modules, the battery module is provided with a pole, one end of the connecting sheet is connected with the pole of the battery module, the other end of the connecting sheet is connected with the pole of the adjacent battery module, the outer peripheral wall of the pole is provided with an external thread, one end of the pole away from the battery module is matched and connected with a plug, the first cold water plate is arranged at the bottom of the battery module, the second cold water plate is arranged between the top of the battery module and the plug, and the second cold water plate is provided with a first through hole for the pole to pass through.

[0005] Optionally, the battery module comprises a shell, a winding core and a tab, the winding core and the tab are arranged inside the shell, the tab is connected with the winding core, one end of the pole is connected with the tab, and the other end of the pole is matched with the plug, the shell is provided with a second through hole for the pole to pass through, and the first cold water plate is arranged at the bottom of the shell.

[0006] Optionally, the outer side wall of the shell is provided with an insulating layer, and the second cold water plate is arranged between the insulating layer and the plug.

[0007] Optionally, the housing is provided with an adapter plate, one side of which is welded to the electrode tab and the other side of which is welded to the electrode post.

[0008] Optionally, a sealing ring is provided in the second through hole, and the pole passes through the sealing ring and is connected to the screw plug. The sealing ring is elastic.

[0009] Optionally, the electrode tab includes a positive electrode tab and a negative electrode tab, and the electrode post includes a positive electrode post and a negative electrode post. One end of the positive electrode tab is connected to the winding core, and the other end of the positive electrode tab is connected to the positive electrode post. One end of the negative electrode tab is connected to the winding core, and the other end of the negative electrode tab is connected to the negative electrode post.

[0010] Optionally, the housing is provided with an explosion-proof valve and a liquid injection port, and neither the explosion-proof valve nor the liquid injection port is located on the same side as the electrode tab.

[0011] Optionally, the positive and negative tabs are located on the same side of the winding core.

[0012] The beneficial effects of this invention are as follows: A first cooling plate is provided at the bottom of the cell module, and a second cooling plate is provided at the top of the cell module, increasing the cooling surface of the cell module and improving battery safety. Furthermore, the terminals are integrated into the top second cooling plate by bolts, achieving high integration or completely module-free CTP technology, eliminating the battery module assembly step, thereby improving the production efficiency from battery to battery pack, space utilization, and system energy density, and reducing battery manufacturing costs. The connecting piece is a metal plate, and the connection method can be one or a combination of laser welding or ultrasonic welding. The terminal shape can be any one or a combination of square, circular, and polygonal shapes. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the battery pack structure proposed in an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the cell module structure of the battery pack proposed in an embodiment of the present invention.

[0015] The labels in the attached figures are as follows: 1. First cooling plate; 2. Second cooling plate; 3. Connecting piece; 4. Housing; 5. Core; 6. Positive electrode tab; 7. Negative electrode tab; 8. Positive electrode post; 9. Negative electrode post; 10. Insulation layer; 11. Screw plug; 12. Adapter piece; 13. Sealing ring; 14. Explosion-proof valve; 15. Liquid injection hole; 16. Battery cell module. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0017] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0019] like Figure 1 As shown, this embodiment discloses a battery pack including a first cooling plate 1, a second cooling plate 2, a connecting piece 3, and multiple cell modules 16. Each cell module 16 has terminals. One end of the connecting piece 3 is connected to a terminal of the cell module 16, and the other end of the connecting piece 3 is connected to a terminal of an adjacent cell module 16. The outer peripheral wall of each terminal has external threads, and a screw plug 11 is fitted to the end of the terminal away from the cell module 16. The first cooling plate 1 is located at the bottom of the cell module 16, and the second cooling plate 2 is located between the top of the cell module 16 and the screw plug 11. The second cooling plate 2 has a first through hole for the terminal to pass through. The presence of the first cooling plate 1 at the bottom of the cell module 16 and the second cooling plate 2 at the top increases the cooling surface of the cell module 16, improving battery safety. Furthermore, the terminal blocks are bolted into the top second cooling plate 2, improving cooling efficiency while achieving high integration or completely module-free CTP technology. This eliminates the battery module assembly step, thereby improving the production efficiency, space utilization, and system energy density from battery to battery pack, and reducing battery manufacturing costs. The connecting piece 3 is a metal plate, and the connection method can be one or a combination of laser welding or ultrasonic welding. The terminal block shape can be any combination of square, circular, or polygonal shapes.

[0020] like Figure 1 and 2As shown, the battery cell module 16 includes a housing 4, a winding core 5, and electrode tabs. The winding core 5 and electrode tabs are disposed inside the housing 4. The electrode tabs are connected to the winding core 5. One end of the electrode post is connected to the electrode tab, and the other end of the electrode post mates with the screw plug 11. The housing 4 has a second through hole for the electrode post to pass through. The first cold water plate 1 is disposed at the bottom of the housing 4. The first cold water plate 1 is disposed at the bottom of the housing 4 in a conventional manner.

[0021] In this embodiment, as Figure 2 As shown, the outer wall of the housing 4 is provided with an insulating layer 10, and the second cold water plate 2 is disposed between the insulating layer 10 and the screw plug 11. The insulating layer 10 can be surface-insulated by spraying, applying adhesive, or a combination of both methods on the surface of the housing 4. An adapter piece 12 is provided inside the housing 4. One side of the adapter piece 12 is welded to the electrode tab, and the other side is welded to the electrode post. The adapter piece 12 is made of metal, and the electrode tab is welded to the electrode post through the adapter piece 12, increasing the stability of the welding between the electrode tab and the electrode post.

[0022] like Figure 2 As shown, a sealing ring 13 is provided inside the second through hole. The pole passes through the sealing ring 13 and is connected to the screw plug 11. The sealing ring 13 is elastic. The sealing ring 13 can be made of plastic, rubber, or silicone.

[0023] like Figure 2 As shown, the electrode tabs include a positive electrode tab 6 and a negative electrode tab 7, and the electrode posts include a positive electrode post 8 and a negative electrode post 9. One end of the positive electrode tab 6 is connected to the core 5, and the other end of the positive electrode tab 6 is connected to the positive electrode post 8. One end of the negative electrode tab 7 is connected to the core 5, and the other end of the negative electrode tab 7 is connected to the negative electrode post 9. The electrode tabs are welded to the corresponding areas of the electrode posts via adapter pieces 12. The welding method can be one or a combination of laser welding, friction welding, or ultrasonic welding. The positive electrode tab 6 and the negative electrode tab 7 are located on the same side of the core 5. The core 5 can be prepared by either stacking or winding.

[0024] In this embodiment, as Figure 1 As shown, the housing 4 is provided with an explosion-proof valve 14 and a liquid injection hole 15, and neither the explosion-proof valve 14 nor the liquid injection hole 15 is located on the same side as the electrode tab. The explosion-proof valve 14 and the liquid injection hole 15 can be located at the bottom, left side, or right side of the housing 4. When the explosion-proof valve 14 is located at the bottom of the housing 4, the first cold water plate 1 is provided with an opening.

[0025] It is understood that the specific embodiments described above are merely for explaining the relevant utility model and not for limiting the utility model. It should also be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict with each other. All equivalent structural transformations made based on the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, The device includes a first cold water plate (1), a second cold water plate (2), a connecting piece (3), and multiple battery cell modules (16). Each battery cell module (16) has a terminal post. One end of the connecting piece (3) is connected to the terminal post of the battery cell module (16), and the other end of the connecting piece (3) is connected to the terminal post of an adjacent battery cell module (16). The outer peripheral wall of the terminal post is provided with an external thread. The end of the terminal post away from the battery cell module (16) is connected with a screw plug (11). The first cold water plate (1) is located at the bottom of the battery cell module (16), and the second cold water plate (2) is located between the top of the battery cell module (16) and the screw plug (11). The second cold water plate (2) is provided with a first through hole for the terminal post to pass through.

2. The battery pack according to claim 1, characterized in that, The battery cell module (16) includes a housing (4), a core (5), and a tab. The core (5) and the tab are located inside the housing (4). The tab is connected to the core (5). One end of the pole is connected to the tab, and the other end of the pole is engaged with the screw plug (11). The housing (4) has a second through hole for the pole to pass through. The first cold water plate (1) is located at the bottom of the housing (4).

3. The battery pack according to claim 2, characterized in that, The outer wall of the housing (4) is provided with an insulating layer (10), and the second cold water plate (2) is disposed between the insulating layer (10) and the screw plug (11).

4. The battery pack according to claim 2, characterized in that, The housing (4) is provided with an adapter plate (12), one side of the adapter plate (12) is welded to the electrode tab, and the other side of the adapter plate (12) is welded to the electrode post.

5. The battery pack according to claim 2, characterized in that, A sealing ring (13) is provided in the second through hole. The pole passes through the sealing ring (13) and is connected to the screw plug (11). The sealing ring (13) is elastic.

6. The battery pack according to claim 2, characterized in that, The electrode tabs include a positive electrode tab (6) and a negative electrode tab (7), and the electrode posts include a positive electrode post (8) and a negative electrode post (9). One end of the positive electrode tab (6) is connected to the core (5), and the other end of the positive electrode tab (6) is connected to the positive electrode post (8). One end of the negative electrode tab (7) is connected to the core (5), and the other end of the negative electrode tab (7) is connected to the negative electrode post (9).

7. The battery pack according to claim 2, characterized in that, The housing (4) is provided with an explosion-proof valve (14) and a liquid injection hole (15), and the explosion-proof valve (14) and the liquid injection hole (15) are not located on the same side as the electrode tab.

8. The battery pack according to claim 6, characterized in that, The positive electrode tab (6) and the negative electrode tab (7) are located on the same side of the core (5).

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