Battery pack and energy storage system

Abstract

The utility model provides a battery pack and an energy storage system, and the battery pack comprises a bottom plate, a battery pack and an end plate which are arranged on the bottom plate, and a limiting piece arranged on the end plate, the battery pack comprises a plurality of battery cells which are sequentially arranged on the bottom plate in the first direction, and the end plates are located at the two ends of the battery pack in the first direction and clamp the battery pack; and the limiting piece is connected between the end plates at the two ends and abuts against the battery pack. According to the battery pack disclosed by the utility model, the battery pack is clamped by the end plates at the two ends, and the limiting piece connected between the end plates at the two ends is propped against the battery pack, so that the battery pack is simple in structure and convenient to assemble, and the fixing effect of the battery pack is ensured while the production efficiency is improved; and the situation that the battery cells fall off in the use process of the battery pack is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Meanwhile, the utility model also relates to an energy storage system provided with the battery pack. Background Art

[0002] At present, most of the battery packs of household energy storage battery systems on the market adopt the CTM ("Cell to Module", which represents the integration mode of integrating battery cells on a module), MTP ("Module-to-Pack", the form of forming a battery pack from batteries and modules, multiple batteries form a module, and multiple modules plus components such as BMS and counterweight modules are combined into a battery), etc. However, when assembling using the above-mentioned schemes, there are many production links and the production process is relatively complex.

[0003] In the prior art, although there are also some battery packs assembled through the CTP ("Cell to PACK") scheme, limited by the structure of the battery pack itself, the assembly operation is relatively complex, the production cost is relatively high, and there is a risk of battery cell detachment during use, which is likely to cause damage to related components in the battery pack. Summary of the Utility Model

[0004] In view of this, the utility model aims to provide a battery pack to simplify the assembly operation of the battery pack and improve the fixing effect on the battery cells.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A battery pack includes a bottom plate, a battery group and an end plate arranged on the bottom plate, and a limiting member arranged on the end plate;

[0007] The battery group includes a plurality of battery cells arranged in sequence on the bottom plate along a first direction, the end plates are located at both ends of the battery group along the first direction and clamp the battery group;

[0008] The limiting member is connected between the two end plates and abuts against the battery group.

[0009] Further, the limiting member includes a pressing strip that abuts against both sides of the battery group in a second direction;

[0010] The first direction is perpendicular to the second direction in the horizontal plane.

[0011] Further, the end plate includes a body part and an abutting part arranged on the body part and protruding towards the battery group, and the end plate abuts against the battery group through the abutting part;

[0012] The abutting portion has connecting surfaces located at both ends along the second direction, and both ends of the pressing strip along the first direction are respectively connected to the connecting surfaces of the two end plates.

[0013] Furthermore, it further includes side plates provided on the outer sides of the pressing strips on both sides and correspondingly arranged with the pressing strips on both sides.

[0014] A wiring harness plug is provided on one of the side plates, and a power wiring harness is connected between the wiring harness plug and the battery pack.

[0015] Relative to the side plate provided with the wiring harness plug, a protection plate is provided on the pressing strip corresponding to the other side plate, and a collection wiring harness is connected between the protection plate and the battery pack.

[0016] Furthermore, the limiting member further includes a busbar bracket that abuts tightly against the top of the battery cell.

[0017] Furthermore, clamping protrusions extending towards the end plate are provided at both ends of the busbar bracket along the first direction, and clamping holes for clamping with the clamping protrusions are provided on the end plate.

[0018] Furthermore, a heat-conducting pad is provided between the battery pack and the bottom plate.

[0019] Compared with the prior art, the present utility model has the following advantages:

[0020] For the battery pack of the present utility model, by clamping the battery pack with the end plates at both ends and making the limiting member between the end plates at both ends abut tightly against the battery pack, the structure is simple and the assembly is convenient. It is beneficial to improve the production efficiency while ensuring the fixing effect on the battery pack, preventing the battery cell from falling off during the use of the battery pack, and being able to apply a certain pre-tightening force to the battery pack to inhibit the breathing expansion of the battery cell during use, thereby improving the service life of the battery pack.

[0021] In addition, the limiting member includes a pressing strip that abuts tightly against both sides of the battery pack along the second direction, with a simple structure and convenient assembly, and the battery pack can be clamped in the second direction by the pressing strips on both sides to improve the fixing effect on the battery pack.

[0022] In addition, by arranging the wiring harness plug and the protection plate on one side plate and the pressing strip corresponding to the other side plate respectively, it is beneficial to prevent the risk that the electromagnetic interference generated when the power wiring harness transmits strong electric current causes electromagnetic interference to the power supply and signal transmission of the collection wiring harness to the protection plate, and the resulting error reporting situation due to inaccurate data collection by the protection plate.

[0023] Secondly, by pressing the busbar bracket against the top of the battery pack, it is beneficial to strengthen the limit of the battery pack in its height direction and further improve the fixing effect of the battery pack.

[0024] Another object of the present invention is to provide an energy storage system, which includes a plurality of battery packs stacked one above the other as described above.

[0025] Furthermore, a downwardly concave groove is provided at the top of the battery pack, and a downwardly protruding protrusion is provided at the bottom of the battery pack;

[0026] The protrusion of the upper battery pack is embedded in the groove of the adjacent lower battery pack.

[0027] Furthermore, a gasket is provided in the groove, and an elastic member is provided between the gasket and the bottom of the groove. Under the elastic action of the elastic member, the gasket is flush with the part of the top of the battery pack close to the groove.

[0028] For the energy storage system of the present invention, by providing the battery pack as described above, it is beneficial to prevent the cores in the battery pack from falling off during use and is also beneficial to improving the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0030] Figure 1 is a schematic structural diagram of the battery pack according to the embodiment of the present invention;

[0031] Figure 2 is an exploded view of the parts of the battery pack according to the embodiment of the present invention;

[0032] Figure 3 is a schematic diagram of a part of the structure of the battery pack according to the embodiment of the present invention;

[0033] Figure 4 is a schematic diagram of another part of the structure of the battery pack according to the embodiment of the present invention;

[0034] Figure 5 is a schematic structural diagram of the pressure strip and the protection plate according to the embodiment of the present invention;

[0035] Figure 6 is a schematic structural diagram of the end plate and the busbar bracket according to the embodiment of the present invention;

[0036] Figure 7 is a schematic structural diagram of the end plate according to the embodiment of the present invention;

[0037] Figure 8 This is a partial structural schematic diagram of the busbar bracket according to the embodiment of the present utility model.

[0038] Explanation of the reference numerals in the drawings:

[0039] 1. Bottom plate; 2. Battery pack; 3. End plate; 301. Body part; 302. Contact part; 3021. Connection surface; 4. Pressure strip; 5. Side plate; 6. Wiring harness plug; 7. Protection board; 8. Acquisition wiring harness; 9. Power wiring harness; 10. Busbar bracket; 11. Clamping hole; 12. Clamping protrusion; 13. Mounting plate; 14. Cover plate; 15. Groove; 16. Protrusion; 17. Gasket; 18. Elastic member; 19. Guide post; 20. Avoidance hole; 21. Thermal conductive pad. Detailed implementation manners

[0040] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0041] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0042] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connection member" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0043] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0044] Embodiment 1

[0045] This embodiment relates to a battery pack. In terms of the overall composition, as Figure 1 and Figure 2As shown in the figure, the battery pack includes a bottom plate 1, a battery pack 2 disposed on the bottom plate 1 and end plates 3, and a limiting member disposed on the end plates 3. The battery pack 2 includes a plurality of battery cells arranged in sequence on the bottom plate 1 along a first direction. The end plates 3 are located at both ends of the battery pack 2 along the first direction and clamp the battery pack 2. The limiting member is connected between the end plates 3 at both ends and abuts against the battery pack 2.

[0046] It can be understood that in this embodiment, the battery pack 2 is clamped by the end plates 3 at both ends. During the assembly process, one end plate 3 can be first installed on the bottom plate 1, and then a plurality of battery cells are arranged on the bottom plate 1 in sequence through an external tooling. After the battery cells are stacked, the other end plate 3 can be assembled on the bottom plate 1 and the battery pack 2 is pressed tightly. The assembly operation is simple. By providing a limiting member, and connecting the limiting member between the end plates 3 at both ends and abutting against the battery pack 2, it is convenient to pre-tighten and fix the battery pack 2 during the assembly process, facilitating the assembly of the subsequent remaining parts, and helping to improve the fixing effect of the battery pack 2 and prevent the battery cells from falling off during the use of the battery pack.

[0047] Moreover, it is also worth mentioning that in this embodiment, the battery pack 2 is clamped by the end plates 3 on both sides, and the limiting member abuts against the battery pack 2, which can apply a certain pre-tightening force to the battery pack 2, inhibit the breathing expansion of the battery cells during use, and thus improve the service life of the battery pack.

[0048] Based on the above overall introduction, as a preferred implementation manner, as Figure 4 shown in the figure, in this embodiment, the limiting member includes a pressing strip 4 that abuts against both sides of the battery pack 2 along a second direction, and the first direction is perpendicular to the second direction in the horizontal plane. With such a setting, the structure is simple, the assembly is convenient, and the battery pack 2 can be clamped in the second direction by the pressing strips 4 on both sides, improving the fixing effect of the battery pack 2.

[0049] Preferably, as Figure 4 、 Figure 6 and Figure 7 shown in the figure, the end plate 3 includes a body part 301 and an abutting part 302 provided on the body part 301 and protruding towards the battery pack 2. The end plate 3 abuts against the battery pack 2 through the abutting part 302. The abutting part 302 has connection surfaces 3021 located at both ends along the second direction, and both ends of the pressing strip 4 along the first direction are respectively connected to the connection surfaces 3021 of the two end plates 3. With such a setting, it is convenient for the connection operation between the pressing strip 4 and the end plate 3. And in specific implementation, the pressing strip 4 and the connection surface 3021 can be connected by means such as welding and bolt connection commonly used in the prior art.

[0050] As a preferred implementation manner, as Figure 3 and Figure 4As shown in the figure, the battery pack of this embodiment further includes side plates 5 provided on the outer sides of the two side pressing strips 4 and correspondingly arranged with the two side pressing strips 4 respectively. A wire harness plug 6 is provided on one side plate 5, and a power wire harness 9 is connected between the wire harness plug 6 and the battery pack 2. Relative to the side plate 5 provided with the wire harness plug 6, a protection plate 7 is provided on the side pressing strip 4 corresponding to the other side plate 5, and a collection wire harness 8 is connected between the protection plate 7 and the battery pack 2.

[0051] It should be noted that the above-mentioned wire harness plug 6, power wire harness 9, collection wire harness 8 and protection plate 7 are all components commonly used in existing battery packs. Among them, the power wire harness 9 is mainly used to supply power to each electrical component, and it is usually a high-voltage wire harness. The collection wire harness 8 is mainly used to collect parameters such as the voltage and temperature of the battery cells, and it is usually a low-voltage wire harness. The protection plate 7 can be a lithium battery protection plate commonly used in existing battery packs.

[0052] In this embodiment, the wire harness plug 6 and the protection plate 7 are arranged separately, which is beneficial to preventing electromagnetic interference generated when the power wire harness 9 transmits strong electric current, resulting in the risk that the collection wire harness 8 is affected by electromagnetic interference during power supply and signal transmission to the protection plate 7, and the error reporting situation caused by inaccurate data collection of the protection plate 7. In addition, for the convenience of installing the protection plate 7, a mounting plate 13 for installing the protection plate 7 can be provided on one of the side pressing strips 4.

[0053] As a preferred embodiment, as Figure 3 and Figure 6 shown in the figure, the limiting member further includes a busbar bracket 10 that abuts against the top of the battery pack 2. By making the busbar bracket 10 abut against the top of the battery pack 2, it is beneficial to strengthen the limitation of the battery pack 2 in its height direction and further improve the fixing effect of the battery pack 2. And a busbar can be provided on the busbar bracket 10 to realize the connection between each battery cell.

[0054] Preferably, as Figure 7 and Figure 8 shown in the figure, in this embodiment, clamping protrusions 12 extending in the direction of the end plate 3 are provided at both ends of the busbar bracket 10 along the first direction, and clamping holes 11 for clamping with the clamping protrusions 12 are provided on the end plate 3. By providing the clamping protrusions 12 on the busbar bracket 10 and the clamping holes 11 on the end plate 3, it is easy to clamp the busbar bracket 10 between the two side end plates 3, with a simple structure and convenient operation.

[0055] As a preferred embodiment, as Figure 2As shown in the figure, in this embodiment, a heat-conducting pad 21 is provided between the battery pack 2 and the bottom plate 1. With such a setting, it is beneficial for the heat generated by the battery cells during charging and discharging to be transferred to the bottom plate 1 through the heat-conducting pad 21 and dissipated by means of the bottom plate 1. It should be noted that the heat-conducting pad 21 in this embodiment can be a heat-conducting pad 21 commonly used in the prior art, and no further detailed description will be given here. In addition, since the bottom plate 1 of the battery pack is usually made of a metal material, after the heat is transferred to the bottom plate 1, it can be dissipated by means of its good heat dissipation performance, thereby achieving a better heat dissipation effect.

[0056] It should be noted that the structures in the battery pack of this embodiment that are not described in the above content, such as the cover plate 14, etc., can be set with reference to the relevant structures in the existing battery packs, and no further detailed description will be given here.

[0057] When assembling the battery pack of this embodiment, the pressure strip 4 and the protection plate 7 can be pre-assembled first. Then, the heat-conducting pad 21 is pasted on the bottom plate 1, and one side end plate 3 is installed on the bottom plate 1. Then, the battery cells are stacked on the bottom plate 1, and a foam can be provided between two adjacent battery cells. After the battery cells are stacked, the other end plate 3 can be installed. Then, the pressure strip 4 can be connected between the two end plates 3, and the busbar bracket 10 installed with the busbar is clamped between the two end plates 3. After connecting the busbar to the pole posts of the battery cells, the acquisition wire harness 8 can be connected. Then, the side plates 5 on both sides are installed, and the power wire harness 9 is connected, and then the cover plate 14 can be installed to complete the assembly of the battery pack.

[0058] In the battery pack of this embodiment, by clamping the battery pack 2 with the two end plates 3 at both ends and making the pressure strip 4 and the busbar bracket 10 connected between the two end plates 3 at both ends abut against the battery pack 2, the structure is simple and the assembly is convenient. It is beneficial to improve the production efficiency while facilitating the guarantee of the fixing effect on the battery pack 2, preventing the battery cells from falling off during the use of the battery pack, and being able to apply a certain pre-tightening force to the battery pack 2 to inhibit the breathing expansion of the battery cells during use, thereby improving the service life of the battery pack.

[0059] Embodiment Two

[0060] This embodiment relates to an energy storage system, including a plurality of battery packs in Embodiment One stacked one above the other in sequence. In the energy storage system of this embodiment, by providing the battery pack of Embodiment One, it is beneficial to prevent the battery cells in the battery pack from falling off during use and is beneficial to improving the service life.

[0061] As a preferred implementation manner, such as Figure 2As shown in the figure, a downwardly concave groove 15 is provided at the top of the battery pack, and a downwardly protruding protrusion 16 is provided at the bottom of the battery pack. The protrusion 16 of the upper battery pack is embedded in the groove 15 of the adjacent lower battery pack. With such a setting, it is convenient to realize the stacking limit of each battery pack. Moreover, the groove 15 is provided on the cover plate 14 of the battery pack, and the protrusion 16 is provided on the bottom plate 1 of the battery pack, which is beneficial to improving the strength of the cover plate 14 and the bottom plate 1.

[0062] Preferably, as Figure 1 and Figure 2 shown in the figure, a gasket 17 is provided in the groove 15, and an elastic member 18 is provided between the gasket 17 and the bottom of the groove 15. Under the elastic action of the elastic member 18, the gasket 17 is flush with the part of the battery pack top close to the groove 15. By making the gasket 17 flush with the part of the battery pack top close to the groove 15, it is beneficial to improve the neatness and aesthetics of the battery pack surface. And when the battery packs need to be stacked, the gasket 17 can be pushed into the groove 15 by the protrusion 16 of the upper battery pack, without affecting the stacking of the battery packs.

[0063] In addition, to improve the stability of the gasket 17 during movement, a guide post 19 is provided at the bottom of the gasket 17. The guide post 19 passes through the bottom of the groove 15, and the elastic member 18 can be a spring sleeved on the guide post 19. And, to facilitate the movement of the guide post 19, an avoidance hole 20 for avoiding the guide post 19 can be provided on the side plate 5.

[0064] The energy storage system of this embodiment, by providing the battery pack of the first embodiment, is beneficial to preventing the situation of the battery cells in the battery pack falling off during use, and is beneficial to improving the service life. And by providing a downwardly concave groove 15 at the top of the battery pack and a downwardly protruding protrusion 16 at the bottom of the battery pack, it is convenient to realize the stacking limit of each battery pack.

[0065] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: It includes a bottom plate, a battery pack and an end plate arranged on the bottom plate, and a stopper arranged on the end plate; The battery pack includes a plurality of battery cells sequentially arranged on the bottom plate along a first direction, and the end plates are located at both ends of the battery pack along the first direction and clamp the battery pack; The limiting member is connected between the end plates at both ends and is tightly pressed against the battery pack; The limiting member includes pressure strips pressed against two sides of the battery pack in the second direction; The first direction is perpendicular to the second direction in a horizontal plane; It also includes side panels arranged on the outer sides of the pressure strips on both sides and respectively arranged corresponding to the pressure strips on both sides; A wiring harness plug is provided on one of the side panels, and a power wiring harness is connected between the wiring harness plug and the battery pack; Relative to the side plate provided with the wiring harness plug, a protection plate is provided on the pressure strip corresponding to the other side plate, and a collection wiring harness is connected between the protection plate and the battery pack.

2. The battery pack according to claim 1, characterized in that: The end plate includes a main body portion and an abutment portion provided on the main body portion and protruding toward the direction of the battery pack, and the end plate abuts against the battery pack through the abutment portion; The abutting portion has connecting surfaces at two ends along the second direction, and two ends of the pressure strip along the first direction are respectively connected to the connecting surfaces of the two end plates.

3. The battery pack according to claim 1, characterized in that: The limiting member also includes a busbar bracket pressed against the top of the battery core.

4. The battery pack according to claim 3, characterized in that: The busbar support is provided with clamping protrusions extending toward the end plate at both ends along the first direction, and the end plate is provided with clamping holes clamped with the clamping protrusions.

5. The battery pack according to claim 1, characterized in that: A heat conducting pad is provided between the battery pack and the bottom plate.

6. An energy storage system, characterized in that: The invention comprises a plurality of battery packs according to any one of claims 1 to 5 stacked in sequence one above the other.

7. The energy storage system according to claim 6, characterized in that: The top of the battery pack is provided with a groove that is sunken downward, and the bottom of the battery pack is provided with a protrusion that extends downward; The protrusion of the upper battery pack is embedded in the groove of the lower adjacent battery pack.

8. The energy storage system according to claim 7, characterized in that: A gasket is provided in the groove, and an elastic member is provided between the gasket and the bottom of the groove. Under the elastic action of the elastic member, the gasket is flush with the portion of the top of the battery pack close to the groove.

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