Battery pack and power device

Abstract

The utility model discloses a battery pack and a power plant, the battery pack comprises: a housing, an accommodating cavity is formed in the housing, the housing comprises a cover plate, an exhaust groove and an electrical groove which are arranged at an interval are formed on the cover plate, and the exhaust groove and the electrical groove are both recessed towards a direction far away from a battery module; the battery modules are covered with the cover plate, the top of each battery module is provided with an anti-explosion valve and a pole, the anti-explosion valves are located in the exhaust grooves, and the poles are located in the electrical grooves. According to the battery pack disclosed by the utility model, the distance between the battery modules is reduced, X-direction and Y-direction spaces in the battery pack are not occupied, and the energy volume of the battery pack is improved under the condition that the space volume of the battery pack is not changed, so that the energy density of the battery pack is improved, the structural strength of the battery pack is improved, and the compression resistance of the whole pack is improved; and meanwhile, failure risks such as cell deformation and liquid leakage during extrusion and collision are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power device manufacturing, in particular to a battery pack and a power device. Background Art

[0002] It is pointed out in the related art that in the current power battery pack, basically, the blade battery cells form a circuit through copper bars and wire harnesses to provide power for the whole pack. Now, the common battery cells are all side-out pole columns. This scheme requires a certain space to be reserved between the battery cells and the housing, and between the battery cells and the battery cells themselves to accommodate the wire harness. The conventional reserved gap is between 20 - 60 mm. The wire harness occupies a large space inside the pack, and the pole columns of the battery cells have poor anti-extrusion ability, and the safety risks such as leakage of liquid in side collision are high. In addition, there are exhaust channels, high-voltage and low-voltage wire harnesses, copper bars, etc. inside the battery pack. After thermal runaway, electrical risks are likely to occur due to heat accumulation. Structures such as crossbeams, longitudinal beams, cold plates, and bottom protection plates are also required inside the battery pack, resulting in low space utilization rate and high cost. Currently, in the new energy industry, the requirements for battery power and safety under the same volume are getting higher and higher, and the traditional layout scheme can no longer meet the requirements of high energy density and high safety. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides a battery pack with high space utilization rate and low production cost.

[0004] The utility model also provides a power device with the above battery pack.

[0005] The battery pack according to the first aspect of the utility model includes: a housing, an accommodation cavity is formed inside the housing, the housing includes a cover plate, and exhaust grooves and electrical grooves are formed on the cover plate at intervals; a battery module, the battery module includes a plurality of them, and the plurality of battery modules are arranged in an array in the accommodation cavity, the cover plate is covered on the battery module, each battery module has an explosion-proof valve and a pole column at the top, the explosion-proof valve is located in the exhaust groove, the pole column is located in the electrical groove, and both the exhaust groove and the electrical groove are recessed in a direction away from the battery module.

[0006] According to the battery pack of the utility model, by providing an exhaust groove for exhaust and an electrical groove for wiring, the explosion-proof valve and the pole column are arranged at the top of the battery module, the distance between the battery modules is reduced, and the X-direction and Y-direction spaces inside the battery pack are not occupied. Under the condition that the space volume of the battery pack remains unchanged, the energy volume of the battery pack is increased, thereby improving the energy density of the battery pack, also improving the structural strength of the battery pack, enhancing the compressive performance of the whole pack, and at the same time reducing the failure risks such as deformation and liquid leakage of the battery cells during extrusion and collision.

[0007] In some embodiments, the battery pack further includes: a first bonding member disposed between the cover plate and the battery module, and the first bonding member extends along the length direction of the battery pack.

[0008] In some embodiments, one end of the exhaust groove is formed with an exhaust hole communicating with the exhaust groove, and an electrical connection portion is formed at one end of the electrical groove away from the exhaust hole in the length direction.

[0009] In some embodiments, the housing further includes a frame, and a second bonding member is disposed between the battery module and the frame, and the second bonding member extends along the extending direction of the frame around the inner peripheral wall of the frame.

[0010] In some embodiments, a cross beam extending along the width direction of the battery pack is disposed inside the frame, and the cross beam is at least located between every two adjacent battery modules in the length direction.

[0011] In some embodiments, the battery pack further includes: a seal disposed between the frame and the cover plate.

[0012] In some embodiments, the cover plate and the frame are connected by fasteners.

[0013] In some embodiments, the housing further includes a cold plate disposed at the bottom of the battery module and adhesively connected to the battery module through a thermal conductive adhesive.

[0014] In some embodiments, the battery pack further includes: a protection member disposed on a surface of the cold plate facing away from the battery module.

[0015] The power device according to the second aspect of the present invention includes the battery pack according to the first aspect of the present invention above.

[0016] By providing the battery pack of the first aspect above, the power device according to the present invention improves the overall performance of the power device, enhances the safety performance of the power device, and reduces the production cost.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the present invention;

[0019] Figure 2 is Figure 1 a top view schematic diagram of the battery pack shown in

[0020] Figure 3 is Figure 1 the assembly schematic diagram of the battery pack shown in

[0021] Figure 4 is Figure 3 the schematic diagram of the A-A cross-section of the battery pack shown in

[0022] Figure 5 is Figure 2 the schematic diagram of another perspective of the battery pack shown in

[0023] Figure 6 is Figure 5 the schematic diagram of the B-B cross-section of the battery pack shown in

[0024] Figure 7 is Figure 5 the schematic diagram of the side view of another angle of the battery pack shown in

[0025] Reference numerals:

[0026] 100, battery pack; 1, housing; 11, frame; 111, cross beam; 12, cold plate; 13, cover plate; 131, exhaust groove; 132, electrical groove; 2, battery module; 21, explosion-proof valve; 22, terminal; 3, support plate; 4, structural adhesive; 5, thermal conductive adhesive; 6, protection member; 7, seal. Detailed implementation manners

[0027] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation to the present utility model.

[0028] Next, refer to Figures 1-7 to describe the battery pack 100 according to the embodiment of the first aspect of the present utility model.

[0029] As Figure 1 shown, the battery pack 100 according to the embodiment of the first aspect of the present utility model includes: a housing 1 and a battery module 2.

[0030] Specifically, a receiving cavity is formed inside the housing 1. The housing 1 includes a cover plate 13, and exhaust grooves 131 and electrical grooves 132 are formed on the cover plate 13 and arranged at intervals. The battery module 2 includes a plurality of them, and the plurality of battery modules 2 are arranged in an array in the receiving cavity. The cover plate 13 is covered on the battery module 2. Each battery module 2 has an explosion-proof valve 21 and a pole 22 at the top. The explosion-proof valve 21 is located in the exhaust groove 131, and the pole 22 is located in the electrical groove 132. Both the exhaust groove 131 and the electrical groove 132 are recessed in a direction away from the battery module 2. Thus, the structure of the battery pack 100 is simple and ingeniously designed.

[0031] For the battery pack 100 according to the embodiment of the present invention, by providing the exhaust groove 131 for exhaust and the electrical groove 132 for wiring, the explosion-proof valve 21 and the pole 22 are arranged at the top of the battery module 2, reducing the distance between the battery modules 2, not occupying the X-direction and Y-direction spaces inside the battery pack 100. Without changing the space volume of the battery pack 100, the energy volume of the battery pack 100 is increased, thereby improving the energy density of the battery pack 100. It also improves the structural strength of the battery pack 100, enhances the compressive performance of the whole pack, and at the same time reduces the failure risks such as the deformation and liquid leakage of the battery cells during extrusion and collision.

[0032] In some embodiments of the present invention, the battery pack 100 further includes: a first bonding member, which is arranged between the cover plate 13 and the battery module 2 and extends along the length direction of the battery pack 100. Thus, the first bonding member separates the exhaust groove 131 and the electrical groove 132, and the exhaust groove 131 and the electrical groove 132 are not connected. When thermal runaway occurs, it will not cause electrical safety problems due to the ejection of foreign objects, too high temperature or fire, improving the safety of the battery pack 100, optimizing the space utilization inside the battery pack 100, and ensuring the stable operation and long-term reliability of the battery pack 100 under complex working conditions.

[0033] In some embodiments of the present invention, as Figure 1 shown, an exhaust hole communicating with the exhaust groove 131 is formed at one end of the exhaust groove 131, and an electrical connection portion is formed at one end of the electrical groove 132 that is far from the exhaust hole in the length direction. Thus, the exhaust hole and the electrical connection portion are as far away as possible, effectively isolating the exhaust position and the electrical connection portion, avoiding the influence of high-temperature gas during thermal runaway on the electrical connection, reducing the risk of short circuit or corrosion, improving the safety and reliability of the battery pack 100, and achieving thermal and electrical separation.

[0034] In some embodiments of the present utility model, the housing 1 further includes a frame 11. A second bonding member is provided between the battery module 2 and the frame 11, and the second bonding member extends along the extending direction of the frame 11 around the inner peripheral wall of the frame 11. Thus, the bonding function between the battery module 2 and the components is realized, and at the same time, the tolerances generated during the assembly process of the battery pack 100 can be absorbed, and vibrations can also be absorbed, improving the sealing effect between the battery module 2, the frame 11 and the support plate 3. Moreover, the battery module 2 also acts as a longitudinal beam, with a high overall package mode and good stiffness, saving space in the Y direction.

[0035] Preferably, both the first bonding member and the second bonding member are structural adhesives 4, and the bonding strength of the structural adhesive 4 is greater than 3 Mpa.

[0036] In some embodiments of the present utility model, a cross beam 111 extending along the width direction of the battery pack 100 is provided inside the frame 11, and the cross beam 111 is at least located between every two adjacent battery modules 2 in the length direction. Thus, the modular design inside the battery pack 100 is realized by setting the cross beam 111, which is convenient for assembly and maintenance, improves the assembly efficiency, and reduces the maintenance cost.

[0037] In some embodiments of the present utility model, as Figure 1 and Figure 6 shown, the battery pack 100 further includes: a seal 7, and the seal 7 is provided between the frame 11 and the cover plate 13. Thus, the cover plate 13 and the frame 11 are connected by fasteners and sealed with the seal 7, avoiding pre-drilling holes in the upper and lower shells and not using rivet nuts. The connection method is simple, the connection reliability is high, and the sealing effect is good.

[0038] Preferably, the cover plate 13 and the frame 11 are connected by fasteners.

[0039] In some embodiments of the present utility model, as Figure 1 and Figure 4 shown, the housing 1 further includes a cold plate 12, and the cold plate 12 is provided at the bottom of the battery module 2 and adhesively connected to the battery module 2 by a thermal conductive adhesive 5. It can be understood that while serving as a cooling component, the cold plate 12 also serves as a bottom plate, thus realizing the integration of the components of the battery pack 100, reducing the number of components of the battery pack 100, improving the space utilization rate, reducing the production cost, and the thermal conductive adhesive 5 absorbs the tolerances in the Z direction, improving the assembly accuracy of the battery pack 100.

[0040] Furthermore, the battery pack 100 further includes: a protection member 6, and the protection member 6 is provided on the surface of the cold plate 12 facing away from the battery module 2. Thus, while realizing heat conduction, the multiple functions of protecting the cold plate 12 and heat preservation are realized.

[0041] In some embodiments, the battery pack 100 further includes a support plate 3. The support plate 3 is disposed between every two adjacent battery modules 2 in the width direction, and the support plate 3 extends along the length direction of the battery pack 100. Thereby, the number of components of the battery pack 100 is reduced, the assembly difficulty is lowered, the weight of the battery pack 100 is reduced, the space utilization rate is improved, the production cost is reduced, and the production efficiency is increased.

[0042] Preferably, the support plate 3 is formed as a mica plate or an epoxy board.

[0043] The power device according to the second aspect embodiment of the present invention includes the battery pack 100 according to the first aspect of the present invention above.

[0044] The power device according to the embodiment of the present invention improves the overall performance of the power device, enhances the safety performance of the power device, and reduces the production cost by providing the battery pack 100 according to the first aspect embodiment above.

[0045] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0046] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0047] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0049] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A housing, wherein a receiving cavity is formed in the housing, and the housing comprises a cover plate, wherein an exhaust groove and an electrical groove are formed on the cover plate and are arranged at intervals; A battery module, wherein the battery module comprises a plurality of battery modules, an array of the plurality of battery modules is arranged in the accommodating cavity, the cover plate is arranged on the battery module, the top of each battery module has an explosion-proof valve and a pole, the explosion-proof valve is located in the exhaust groove, the pole is located in the electrical groove, and the exhaust groove and the electrical groove are both recessed in a direction away from the battery module.

2. The battery pack according to claim 1, characterized in that: Also includes: A first adhesive member is disposed between the cover plate and the battery module, and the first adhesive member extends along the length direction of the battery pack.

3. The battery pack according to claim 2, characterized in that: An exhaust hole communicating with the exhaust groove is formed at one end of the exhaust groove, and an electrical connection portion is formed at one end of the electrical groove away from the exhaust hole in the length direction.

4. The battery pack according to claim 2, characterized in that: The housing further comprises a frame, a second adhesive member is disposed between the battery module and the frame, and the second adhesive member extends around the inner peripheral wall of the frame along the extension direction of the frame.

5. The battery pack according to claim 4, characterized in that: A crossbeam extending along the width direction of the battery pack is provided in the frame, and the crossbeam is at least located between every two adjacent battery modules in the length direction.

6. The battery pack according to claim 4, characterized in that: Also includes: A sealing member is arranged between the frame and the cover plate.

7. The battery pack according to claim 6, characterized in that: The cover plate is connected to the frame via a fastener.

8. The battery pack according to any one of claims 1 to 7, characterized in that: The housing further comprises a cold plate, which is arranged at the bottom of the battery module and is bonded to the battery module by a heat-conducting adhesive.

9. The battery pack according to claim 8, characterized in that: Also includes: A protective member is arranged on a surface of the cold plate that is away from the battery module.

10. A power device, characterized in that: A battery pack comprising any one of claims 1-9.

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