Battery pack

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery pack. Comprising a lower shell, a battery cell stacking body, a heat-conducting structural adhesive, a side plate and a sampling assembly, the battery cell stacking body comprises a plurality of soft package battery cells which are arranged in a stacking manner, the battery cell stacking body is arranged in the lower shell, and the bottom side of the battery cell stacking body and a bottom plate of the lower shell are directly bonded and fixed through a heat-conducting structural adhesive; the side plates are positioned in the lower shell and are arranged on the two sides of the battery cell stacking body along the stacking direction of the soft package battery cells in the battery cell stacking body; the sampling assembly is located on the tab side of the cell stack and connected with the soft package cells for sampling, and the two ends of the sampling assembly extend in the stacking direction of the soft package cells in the cell stack and are connected with the side plates to fix the sampling assembly. The sampling assembly is connected with the side plate so as to realize relative fixation of the sampling assembly and the battery cell stack, so that additional arrangement of a supporting piece is not needed, the structure is simplified, the occupied space is reduced, the weight is reduced, and the energy density of the battery pack is favorably improved.

Description

Technical Field

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

[0002] As an important component of new energy vehicles, the power battery system provides a power source for the normal driving of the vehicle. In order to ensure the safety and performance of the power battery system, it is necessary to monitor the voltage, temperature and other information of the battery pack in real time.

[0003] The battery module of a battery pack generally includes multiple battery cells connected in series and parallel. The types of battery cells mainly include cylindrical battery cells, square shell battery cells and soft pack battery cells. The battery cells are generally sampled through a sampling assembly. The sampling assembly includes a sampling element and a support. The sampling element plays the role of collecting and transmitting signals, and the support is mainly used to limit and fix the sampling element.

[0004] At present, the support parts need to be limited and fixed with the upper and lower covers of the battery module, which increases the cost. In addition, the support parts are mainly injection molded parts, which are large in size, heavy in weight, and high in cost. They occupy the internal space of the battery pack, which is not conducive to reducing the cost and miniaturization of the battery pack design, and reduces the energy density of the battery pack. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a battery pack for solving the problems of the sampling components in the prior art being inconvenient to install and fix and occupying a large space, so as to improve the energy density of the battery pack and reduce the cost.

[0006] In order to achieve the above-mentioned object and other related objects, the utility model provides a battery pack, comprising:

[0007] Lower housing;

[0008] A battery cell stack, the battery cell stack comprising a plurality of stacked soft-pack battery cells, the battery cell stack being disposed in the lower housing;

[0009] Thermally conductive structural adhesive, the bottom side of the battery cell stack and the bottom plate of the lower shell are directly bonded and fixed by the thermally conductive structural adhesive;

[0010] Side plates, the side plates are located in the lower housing and are arranged on both sides of the battery stack along the stacking direction of the soft-pack batteries in the battery stack; and

[0011] A sampling component is located on the pole ear side of the battery cell stack and is connected to the soft-pack battery cell for sampling. Both ends of the sampling component extend along the stacking direction of the soft-pack battery cells in the battery cell stack and are connected to the side plate to fix the sampling component.

[0012] Optionally, the sampling assembly includes a sampling element, and the sampling element is connected to the side plate in a positioning and fitting manner via a connecting structure.

[0013] Optionally, the connection structure includes a buckle and a reinforcement plate, the buckle is arranged on the side plate, and the reinforcement plate is arranged on the sampling element and can be engaged with the buckle.

[0014] Optionally, the battery pack also includes an output pole bus electrically connected to the battery cell stack, the clip is arranged on the end wall of the side plate opposite to the reinforcement plate, the reinforcement plate is arranged on the side of the sampling element facing the side plate, and the reinforcement plate is engaged with the clip to clamp the reinforcement plate between the output pole bus and the sampling element.

[0015] Optionally, a positioning column is provided on the end wall of the side plate opposite to the reinforcement plate, and positioning holes corresponding to the positioning column are provided on the output pole bus and the reinforcement plate, and the reinforcement plate is suitable for positioning and snapping with the buckle when the positioning column passes through the positioning hole on the reinforcement plate.

[0016] Optionally, the sampling element is provided with an avoidance hole corresponding to the buckle and the positioning column.

[0017] Optionally, the sampling assembly further includes a reinforcing sheet, which is adhesively fixed to a side of the sampling element directly opposite to the tab side of the battery cell stack.

[0018] Optionally, connectors are provided at both ends of the sampling element, and the connectors are connected and fixed to the side plates.

[0019] Optionally, a mounting groove is provided on the outer side wall of the side plate, and the connector is riveted and fixed in the mounting groove.

[0020] Optionally, two ends of the sampling element are bent in the same direction to form a fixing portion extending into the mounting groove, and the connector is arranged on the fixing portion.

[0021] Optionally, a plurality of sampling terminals are provided on the sampling element, and the plurality of sampling terminals are distributed along the stacking direction of the soft-pack battery cells and connected to the corresponding tabs of the soft-pack battery cells for sampling.

[0022] Optionally, the sampling element includes a flexible printed circuit board.

[0023] As described above, the battery pack of the utility model has at least the following beneficial effects: the sampling assembly is connected to the side plates located on both sides of the battery cell stack to achieve relative fixation of the sampling assembly and the battery cell stack, and no additional support is required, which simplifies the structure, reduces space occupancy, reduces weight, and reduces costs, which is conducive to improving the energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a partial structural schematic diagram of an embodiment of a battery pack of the utility model;

[0025] Figure 2 for Figure 1 A magnified schematic diagram of the local A in the middle;

[0026] Figure 3 for Figure 1 Schematic diagram of the structure when the sampling component is removed from the battery pack;

[0027] Figure 4 for Figure 3 A magnified schematic diagram of the part B in the middle;

[0028] Figure 5 for Figure 1 A schematic diagram of the first-person perspective structure of the sampling component;

[0029] Figure 6 for Figure 5 A magnified schematic diagram of the local C in the middle;

[0030] Figure 7 for Figure 1 A schematic diagram of the second perspective structure of the sampling component;

[0031] Figure 8 for Figure 7 A magnified schematic diagram of the local D in the middle;

[0032] Fig. 9 for Figure 7 Exploded view of the sampling assembly.

[0033] Part Number Description

[0034] Sampling assembly 1, sampling element 11, avoidance hole 111, sampling terminal 112, fixing part 113, reinforcing sheet 12, connector 13, battery cell stack 2, soft-pack battery cell 21, pole ear 211, side plate 3, positioning column 31, mounting groove 32, connecting structure 4, buckle 41, reinforcing plate 42, output pole bus 5, positioning hole 6, rivet 7. DETAILED DESCRIPTION

[0035] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0036] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0037] See also Figures 1 to 4 In some optional embodiments, the present application provides a battery pack, which includes a lower shell, a battery cell stack 2, a thermally conductive structural adhesive, a side plate 3 and a sampling assembly 1. In addition to the above components, the battery pack may also include an output pole bus 5 and / or a shell cover. The battery cell stack 2 includes a plurality of stacked soft-packed batteries 21, and the battery cell stack 2 is arranged in the lower shell; the bottom side of the battery cell stack 2 is directly bonded and fixed to the bottom plate of the lower shell by a thermally conductive structural adhesive; the side plate 3 is located in the lower shell, and is arranged on both sides of the battery cell stack 2 along the stacking direction of the soft-packed batteries 21 in the battery cell stack 2; the sampling assembly 1 is located on the pole ear side of the battery cell stack 2, and is connected to the soft-packed batteries 21 for sampling, and both ends of the sampling assembly 1 extend along the stacking direction of the soft-packed batteries 21 in the battery cell stack 2 and are connected to the side plate 3 to fix the sampling assembly 1.

[0038] Optionally, the battery cell stack 2 is sandwiched between two oppositely arranged side panels 3, which is beneficial to improving the stability of the overall structure of the battery cell stack 2; wherein the side panels 3 can be connected and fixed to the battery cell stack 2 and / or the lower shell to provide reliable installation support for the sampling assembly 1.

[0039] Optionally, there may be multiple cell stacks 2, which are arranged in the lower shell, and the shell cover is located on the top side of the cell stack 2 and seals the lower shell so that the cell stack 2 can be encapsulated in the accommodating space defined by the shell cover and the lower shell.

[0040] Optionally, in the length direction of the soft-packed battery cell 21, both ends of the soft-packed battery cell 21 have a pole ear 211, and the side of the soft-packed battery cell 21 having the pole ear 211 is the same side as the pole ear side of the battery cell stack 2. In the present application, the length direction of the soft-packed battery cell 21, the length direction of the battery cell stack 2 and the length direction of the side plate 3 are the same, that is, the Y direction in the accompanying drawings; the thickness direction of the soft-packed battery cell 21, the stacking direction of multiple soft-packed battery cells 21 in the same battery cell stack 2, the width direction of the battery cell stack 2 and the thickness direction of the side plate 3 are the same, that is, the X direction in the accompanying drawings; the height direction of the soft-packed battery cell 21, the height direction of the battery cell stack 2 and the height direction of the side plate 3 are the same, that is, the Z direction in the accompanying drawings.

[0041] Optionally, the output busbar 5 is electrically connected to the cell stack 2 to achieve external output of the cell stack 2. The output busbar 5 can be mounted and supported on the side plate 3, so that the side plate 3 can provide positioning and support for the output busbar 5 and the sampling assembly 1 at the same time, which is conducive to simplifying the structure.

[0042] In the battery pack of the above embodiment, the battery cell stack 2 is directly bonded and fixed to the lower shell, and the sampling assembly 1 is connected to the side panel 3 to achieve the fixed relative position of the sampling assembly 1 and the battery cell stack 2, which not only ensures the installation stability and reliability of the sampling assembly 1, but also provides installation support for the sampling assembly 1 through the side panel 3 that can provide installation support for the output pole bus 5, so there is no need to set up additional supporting parts to provide installation support for the sampling assembly 1, and there is no need to set up upper covers and lower covers corresponding to each battery cell stack 2 separately, which is conducive to simplifying the structure, improving the compactness of the layout, saving installation space, reducing weight, and is conducive to the small-volume production of the battery pack, improving the energy density of the battery pack and reducing the cost.

[0043] See also Figure 2 , Figures 4 to 6 In some optional embodiments, the sampling assembly 1 includes a sampling element 11 , and the sampling element 11 is connected to the side plate 3 in a positioning and fitting manner via a connecting structure 4 .

[0044] Optionally, the sampling element 11 is snap-fitted and positioned with the side plate 3 , and the connection is detachable, so that the assembly and disassembly operations are simple and convenient.

[0045] Optionally, the sampling element 11 includes a flexible printed circuit (FPC), a sampling harness, a flexible flat cable or other sampling elements capable of collecting and transmitting signals.

[0046] Optionally, the sampling element 11 is provided with a plurality of sampling terminals 112, which are distributed along the stacking direction of the soft-pack battery cells 21 and connected to the corresponding tabs 211 of the soft-pack battery cells 21 for sampling. Further, the sampling terminal 112 includes a nickel sheet.

[0047] Optionally, connectors 13 are provided at both ends of the sampling element 11, and the connectors 13 are connected and fixed to the side panel 3. Furthermore, a mounting groove 32 is provided on the outer wall of the side panel 3, and the outer wall of the side panel 3 refers to the side wall facing away from the battery cell stack 2. The connector 13 is riveted and fixed in the mounting groove 32. This structural design can prevent the outer wall of the connector 13 from protruding from the outer wall of the side panel 3, which not only saves installation space, but also reduces the risk of the connector 13 being squeezed and damaged. Specifically, the two ends of the sampling element 11 are bent in the same direction and extend along the length direction of the side panel 3 to form a fixing portion 113 extending into the mounting groove 32. The connector 13 is arranged on the fixing portion 113 and is riveted and fixed to the side panel 3 by rivets 7.

[0048] Optionally, the sampling assembly 1 further includes a reinforcing sheet 12, which is bonded and fixed to the side of the sampling element 11 that is directly opposite to the pole ear side of the battery cell stack 2. The provision of the reinforcing sheet 12 is conducive to improving the structural strength of the sampling element 11, preventing violent shaking during use, and improving structural stability. Further, the reinforcing sheet 12 includes a plastic sheet.

[0049] In the battery pack of the above embodiment, the sampling element 11 is connected to the side plate 3 by positioning and matching through the connecting structure 4. The positioning connection is simple, convenient and reliable, which is conducive to improving the assembly efficiency of the battery pack and the stability of the overall structure.

[0050] See also Figures 1 to 9 In some optional embodiments, the connection structure 4 includes a buckle 41 and a reinforcement plate 42 . The buckle 41 is disposed on the side plate 3 , and the reinforcement plate 42 is disposed on the sampling element 11 and can be engaged with the buckle 41 .

[0051] Optionally, the reinforcing plate 42 is fixed on the sampling element 11 by heat pressing. Further, the reinforcing plate 42 includes a glass fiber epoxy resin plate.

[0052] Optionally, the buckle 41 is arranged on the end wall of the side plate 3 directly opposite to the reinforcing plate 42, and the reinforcing plate 42 is arranged on the side of the sampling element 11 facing the side plate 3. The reinforcing plate 42 is engaged with the buckle 41 to clamp the reinforcing plate 42 between the output pole bus 5 and the sampling element 11. The reinforcing plate 42 can not only improve the structural strength of the sampling element 11 and engage with the buckle 41, which is conducive to improving the installation stability of the sampling element 11 and the output pole bus 5, but also the reinforcing plate 42 can separate the output pole bus 5 from the sampling element 11 to avoid direct contact between the output pole bus 5 and the sampling element 11, thereby avoiding damage to the sampling element 11 caused by the output pole bus 5 when the temperature is too high. Among them, the same reinforcing plate 42 can be arranged corresponding to two buckles 41, and a clamping space for accommodating the reinforcing plate 42 is formed between the two buckles 41.

[0053] Optionally, a positioning column 31 is provided on the end wall of the side plate 3 that is directly opposite to the reinforcing plate 42, and a positioning hole 6 corresponding to the positioning column 31 is provided on the output pole bus 5 and the reinforcing plate 42. The reinforcing plate 42 is suitable for positioning and snapping with the buckle 41 when the positioning column 31 passes through the positioning hole 6 on the reinforcing plate 42. During assembly, the positioning column 31 is aligned with the positioning hole 6, and the sampling element 11 is pressed so that the reinforcing plate 42 is snapped into place between the buckles 41, and the assembly operation is simple and convenient.

[0054] Optionally, the sampling element 11 is provided with an avoidance hole 111 corresponding to the buckle 41 and the positioning column 31, that is, the buckle 41, the positioning column 31 and the part where the reinforcing plate 42 is engaged with the buckle 41 can be exposed from the avoidance hole 111, which is not only conducive to avoiding interference between components, but also convenient for observation, making the installation operation simpler and more convenient, and also convenient for checking whether it is assembled in place, which is conducive to ensuring product quality.

[0055] In the battery pack of the above embodiment, the sampling element 11 is simply and conveniently connected to the side plate 3 and is easy to install, which is beneficial to simplifying the process assembly process, improving production efficiency and reducing costs.

[0056] In the battery pack of the utility model, the sampling assembly 1 is connected to the side plate 3 to achieve installation positioning and fixation of the sampling assembly 1. The side plate 3 that can provide installation support for the output pole bus 5 is used to provide positioning and support for the sampling assembly 1. There is no need to set additional supports for the sampling assembly 1, which simplifies the structure, improves space utilization, reduces weight, and is beneficial to improving the energy density of the battery pack.

[0057] In the description of this specification, the description with reference to the terms "this embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: Lower housing; A battery cell stack, the battery cell stack comprising a plurality of stacked soft-pack battery cells, the battery cell stack being disposed in the lower housing; Thermally conductive structural adhesive, the bottom side of the battery cell stack and the bottom plate of the lower shell are directly bonded and fixed by the thermally conductive structural adhesive; Side plates, the side plates are located in the lower shell and are arranged on both sides of the battery stack along the stacking direction of the soft-pack battery cells in the battery stack; as well as A sampling component is located on the pole ear side of the battery cell stack and is connected to the soft-pack battery cell for sampling. Both ends of the sampling component extend along the stacking direction of the soft-pack battery cells in the battery cell stack and are connected to the side plate to fix the sampling component.

2. The battery pack according to claim 1, characterized in that: The sampling assembly comprises a sampling element, and the sampling element is connected to the side plate in a positioning and matching manner via a connecting structure.

3. The battery pack according to claim 2, characterized in that: The connection structure comprises a buckle and a reinforcement plate, wherein the buckle is arranged on the side plate, and the reinforcement plate is arranged on the sampling element and can be engaged with the buckle.

4. The battery pack according to claim 3, characterized in that: The battery pack also includes an output pole busbar electrically connected to the battery cell stack, the buckle is arranged on the end wall of the side plate opposite to the reinforcement plate, the reinforcement plate is arranged on the side of the sampling element facing the side plate, and the reinforcement plate is engaged with the buckle to clamp the reinforcement plate between the output pole busbar and the sampling element.

5. The battery pack according to claim 4, characterized in that: A positioning column is provided on the end wall of the side plate opposite to the reinforcement plate, and positioning holes corresponding to the positioning column are provided on the output pole bus and the reinforcement plate. The reinforcement plate is suitable for positioning and snapping with the buckle when the positioning column passes through the positioning hole on the reinforcement plate.

6. The battery pack according to claim 5, characterized in that: The sampling element is provided with an avoidance hole corresponding to the buckle and the positioning column.

7. The battery pack according to any one of claims 2 to 6, characterized in that: The sampling assembly further includes a reinforcing sheet, which is adhesively fixed to a side of the sampling element directly opposite to the tab side of the battery cell stack.

8. The battery pack according to any one of claims 2 to 6, characterized in that: Connectors are provided at both ends of the sampling element, and the connectors are connected and fixed to the side plates.

9. The battery pack according to claim 8, characterized in that: An installation groove is provided on the outer side wall of the side plate, and the connector is riveted and fixed in the installation groove.

10. The battery pack according to claim 9, characterized in that: The two ends of the sampling element are bent in the same direction to form a fixing portion extending into the installation groove, and the connector is arranged on the fixing portion.

11. The battery pack according to any one of claims 2 to 6, characterized in that: The sampling element is provided with a plurality of sampling terminals, which are distributed along the stacking direction of the soft-pack battery cells and connected to the corresponding tabs of the soft-pack battery cells for sampling.

12. The battery pack according to any one of claims 2 to 6, characterized in that: The sampling element includes a flexible circuit board.

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