Battery module and battery pack

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery module and a battery pack. Comprising a battery cell stacking body, and the battery cell stacking body is provided with a first side provided with a pole; the sampling assembly is located on the second side of the battery cell stacking body, and the second side and the first side are two different sides; a first opening is formed in the connecting piece, the part, provided with the first opening, of the connecting piece is bent so that the two ends of the connecting piece can be distributed on the first side and the second side of the battery cell stacking body respectively, and the two ends of the connecting piece are electrically connected with the pole and the sampling assembly respectively. The sampling assembly avoids the pole and the anti-explosion valve, is not limited by the width of the pole and avoids shielding the anti-explosion valve during installation, and is beneficial to reducing the installation difficulty and improving the safety performance; according to the battery module and the battery pack, by arranging the connecting piece with the first opening, the connecting piece can be conveniently bent and can be conveniently and correspondingly connected with the sampling assembly and the pole, the assembly difficulty is reduced, and therefore the rationality and safety of the overall layout of the battery module and the battery pack are improved.

Description

Technical Field

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

[0002] As new energy vehicles have good energy-saving and emission-reduction effects and are highly intelligent, new energy vehicles are experiencing explosive growth. As the power source of new energy vehicles, the amount of electricity contained in the battery pack directly determines the maximum mileage that the vehicle can travel; and because the space and weight of the battery pack are limited, the energy density and volume density of the battery pack determine the vehicle's cruising range. In order to save space as much as possible, the current mainstream battery packs generally use thin sheet sampling components such as flexible printed circuit boards (Flexible Printed Circuit, referred to as FPC) or flexible flat cables (Flexible Flat Cable, referred to as FFC) for sampling. The layout surface of the sampling component is parallel to the pole surface of the battery cell, and is generally located in the area between the poles of the battery cell. It is easy to have problems such as insufficient installation space and inconvenient installation, especially when the battery cell is small, the distance between the poles of the battery cell is small, and the space between the poles cannot completely arrange the sampling component. Moreover, the sampling component is located between the poles, and the explosion-proof valve of the battery cell is located on the same side as the pole. The sampling component is also very easy to block the explosion-proof valve, affecting the eruption of the battery cell when it is thermally runaway. Utility Model Content

[0003] In view of the shortcomings of the prior art mentioned above, the purpose of the present utility model is to provide a battery module and a battery pack, which are used to solve the problem in the prior art that the sampling component and the pole of the battery cell are on the same side, so as to improve the problem that the sampling component is limited in installation and easy to block the explosion-proof valve, and improve the layout rationality and safety of the battery module and the battery pack.

[0004] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a battery module, including:

[0005] A battery cell stack having a first side provided with a pole;

[0006] a sampling assembly, the sampling assembly being located on a second side of the battery cell stack, the second side being different from the first side; and

[0007] A connecting piece, wherein a first opening is formed on the connecting piece, and a portion of the connecting piece where the first opening is formed is bent so that two ends of the connecting piece are respectively distributed on the first side and the second side of the battery cell stack, and the two ends of the connecting piece are respectively electrically connected to the pole and the sampling assembly.

[0008] Optionally, the connecting sheet is provided with a plurality of the first openings, and the plurality of the first openings are arranged side by side and spaced apart along a width direction of the connecting sheet.

[0009] Optionally, the width of the connecting sheet is D, the sum of the widths of the first openings is d, and 1 / 5D≤d≤5 / 6D.

[0010] Optionally, the connecting piece includes a first straight section, a bent section and a second straight section, the first straight section and the second straight section are connected via the bent section, the first straight section is electrically connected to the sampling assembly, and the second straight section is electrically connected to the pole.

[0011] Optionally, the first opening includes a strip hole extending along the length direction of the connecting piece, the strip hole is arranged on the bending section, and two ends of the strip hole extend to the first straight section and the second straight section respectively.

[0012] Optionally, the first straight section is fixed to the sampling assembly by welding, and the second straight section is fixed to the pole by welding via a bar.

[0013] Optionally, the sampling component includes a sampling element, which extends along the stacking direction of multiple battery cells in the battery cell stack; there are multiple connecting plates, and the multiple connecting plates are spaced apart along the stacking direction of the multiple battery cells and electrically connected to the corresponding battery cells.

[0014] Optionally, the sampling element is connected and fixed to the battery cell stack through an insulating connection assembly; the insulating connection assembly includes a first hot pressing film and a second hot pressing film, at least a portion of the sampling element and at least a portion of the connecting sheet are sandwiched between the first hot pressing film and the second hot pressing film, and the first hot pressing film and the second hot pressing film are both provided with a second opening corresponding to the connecting sheet.

[0015] Optionally, the first side and the second side of the battery cell stack are two sides perpendicular to each other.

[0016] Optionally, the connecting sheet includes a nickel sheet.

[0017] To achieve the above objectives and other related objectives, the present application also provides a battery pack, including the battery module as described above.

[0018] As described above, the battery module and battery pack of the utility model have at least the following beneficial effects: the sampling component and the poles of the battery cell stack are respectively located on different sides of the battery cell stack, so that the sampling component can avoid the poles of the battery cell and the explosion-proof valves of the battery cell, and the installation of the sampling component does not need to be restricted by the width of the poles, which is beneficial to reducing the installation difficulty of the sampling component. The sampling component can also avoid blocking the explosion-proof valve, which is beneficial to improving safety performance; in addition, the sampling component located on the opposite side is connected to the pole of the battery cell stack through a connecting piece provided with a first opening, which is beneficial to bending the connecting piece and facilitating the corresponding connection with the sampling component and the pole, reducing the difficulty of assembly, thereby improving the rationality and safety of the overall layout of the battery module and battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a partial structural schematic diagram of a battery module of an embodiment of the utility model;

[0020] Figure 2 for Figure 1 A magnified schematic diagram of the local A in the middle;

[0021] Figure 3 for Figure 1 Schematic diagram of partial explosion of the middle insulating connection component, sampling component, connection piece and bar piece;

[0022] Figure 4 for Figure 3 Schematic diagram of partial connection of the middle connecting sheet, the second hot pressing film and the bar sheet;

[0023] Figure 5 for Figure 4 A local enlarged schematic diagram in FIG.

[0024] Figure 6 for Figure 3 Schematic diagram of the partial connection between the middle sampling assembly and the connecting piece before bending;

[0025] Figure 7 for Figure 3 Schematic diagram of the structure of the connecting piece.

[0026] Part Number Description

[0027] Battery cell stack 1, battery cell 11, pole 111, explosion-proof valve 112, sampling assembly 2, sampling element 21, temperature sampling terminal 22, connecting piece 3, first opening 31, first straight section 32, bending section 33, second straight section 34, connecting bar piece 41, output pole bar piece 42, insulating connecting assembly 5, first hot pressing film 51, second hot pressing film 52, second opening 53. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] See also Figure 1 , Figure 3 and Figure 7 In some optional embodiments, the present application provides a battery module, which includes a battery cell stack 1, a sampling assembly 2, and a connecting piece 3. The battery cell stack 1 has a first side provided with a pole 111; the sampling assembly 2 is located on a second side of the battery cell stack 1, and the second side is different from the first side; a first opening 31 is provided on the connecting piece 3, and the portion of the connecting piece 3 provided with the first opening 31 is bent so that the two ends of the connecting piece 3 are respectively distributed on the first side and the second side of the battery cell stack 1, and the two ends of the connecting piece 3 are respectively electrically connected to the pole 111 and the sampling assembly 2.

[0031] Optionally, the battery cell stack 1 includes a plurality of stacked battery cells 11, on which a pole 111 and an explosion-proof valve 112 are provided, and the pole 111 and the explosion-proof valve 112 are both provided on the first side of the battery cell 11; wherein the first side of the battery cell 11 is the same side as the first side of the battery cell stack 1. Further, the battery cell 11 is provided with poles 111 and explosion-proof valves 112 at both ends in the length direction thereof, and two groups of sampling components 2 corresponding to the poles 111 at both ends of the battery cell 11 are distributed on the second side of the battery cell stack 1. In the present application, the stacking direction of the multiple battery cells 11 in the battery cell stack 1, the thickness direction of the battery cell 11, the width direction of the battery cell stack 1, the length direction of the sampling assembly 2 and the width direction of the connecting piece 3 are the same, which is the X direction in the accompanying drawings; the height direction of the battery cell 11 is the same as the height direction of the battery cell stack 1, which is the Z direction in the accompanying drawings; the length direction of the battery cell 11, the length direction of the battery cell stack 1 and the width direction of the sampling assembly 2 are the same, which is the Y direction in the accompanying drawings.

[0032] Optionally, the first side and the second side of the cell stack 1 are perpendicular to each other, and the second side of the cell stack 1 is also perpendicular to the Z direction. Further, the second side of the cell stack 1 is the top side of the cell stack 1 .

[0033] Optionally, the connecting sheet 3 includes a nickel sheet.

[0034] In the battery module of the above embodiment, the sampling component 2 and the pole 111 are located on different sides of the battery cell stack 1, that is, the sampling component 2 and the explosion-proof valve 112 are also located on different sides of the battery cell stack 1, the layout is more reasonable, the installation of the sampling component 2 may not be limited by the pole 111, especially the width of the sampling component 2 may not be limited by the width of the pole 111, and the sampling component 2 can avoid the explosion-proof valve 112 to avoid affecting the emission of smoke when the battery cell 11 is thermally runaway; in addition, the sampling component 2 and the pole 111 of the battery cell 11 located on the different sides of the battery cell stack 1 are electrically connected through the connecting piece 3, which is conducive to reducing the difficulty of connection and assembly, and the first opening 31 is provided on the connecting piece 3, which is not only conducive to the bending and forming of the connecting piece 3, but also conducive to the connection operation of the connecting piece 3 with the sampling component 2 and the pole 111, thereby ensuring the product quality of the battery module.

[0035] See also Figure 1 , Figure 2 and Figure 7 In some optional embodiments, the connecting sheet 3 is provided with a plurality of first openings 31, and the plurality of first openings 31 are arranged side by side and spaced apart along the width direction of the connecting sheet 3. It is understandable that the number of the first opening 31 is not limited to a plurality, and one may also be provided.

[0036] Optionally, the width of the connecting sheet 3 is D, the sum of the widths of the first openings 31 is d, 1 / 5D≤d≤5 / 6D, that is, the width of the connecting sheet 3 can be 1 / 5 to 5 / 6 of the sum of the widths of all the first openings 31. For example, when the number of the first opening 31 is one, the width of the first opening 31 is d1, and the sum d of the widths of the first openings 31 is equal to d1; when the number of the first openings 31 is multiple, the widths of the first openings 31 are d1, d2, ..., dn, respectively, and the sum d of the widths of the first openings 31 is the sum of d1, d2, ... and dn, that is, d = d1 + d2 + ... + dn. Further, d can be any value of 1 / 5D, 3 / 5D or 5 / 6D.

[0037] Optionally, the connecting piece 3 includes a first straight section 32, a bent section 33, and a second straight section 34, the first straight section 32 and the second straight section 34 are connected by the bent section 33, the first straight section 32 is located on the second side of the battery cell stack 1, the first straight section 32 is electrically connected to the sampling assembly 2, the second straight section 34 is located on the first side of the battery cell stack 1, and the second straight section 34 is electrically connected to the pole 111. Further, the first straight section 32 is perpendicular to the second straight section 34.

[0038] Optionally, the first straight section 32 is welded and fixed to the sampling assembly 2, and the second straight section 34 is welded and fixed to the pole 111 through a bar. Further, the bar includes a connecting bar 41 and an output pole bar 42, the connecting bar 41 can be used for series and parallel connection between the battery cells 11, and the output pole bar 42 can be used for external output of the battery cell stack 1.

[0039] Optionally, the first opening 31 includes a strip hole extending along the length direction of the connecting piece 3, the strip hole is arranged on the bending section 33, and the two ends of the strip hole extend to the first straight section 32 and the second straight section 34 respectively, which is beneficial to the bending of the connecting piece 3, ensures the structural strength of the connecting piece 3, and facilitates the welding operation of the connecting piece 3 with the sampling assembly 2 and the bar piece respectively.

[0040] In the battery module of the above embodiment, the connecting piece 3 has a simple structure and is easy and convenient to be bent and formed. The sampling assembly 2 and the pole 111 of the battery cell 11 are reliably connected through the connecting piece 3 .

[0041] See also Figures 1 to 6 In some optional embodiments, the sampling component 2 includes a sampling element 21, which extends along the stacking direction of the multiple battery cells 11 in the battery cell stack 1; there are multiple connecting plates 3, and the multiple connecting plates 3 are spaced apart along the stacking direction of the multiple battery cells 11 and are electrically connected to the corresponding battery cells 11.

[0042] Optionally, the sampling element 21 includes a flexible printed circuit board, a flexible flat cable or other elements capable of sampling.

[0043] Optionally, the sampling assembly 2 further includes a temperature sampling terminal 22, which is welded and fixed on the sampling element 21. The temperature sampling terminal 22 can collect the temperature of the battery cell stack 1 and transmit the sampling information to the sampling element 21; wherein the temperature sampling terminal 22 includes a negative temperature coefficient thermistor (Negative Temperature Coefficient, referred to as NTC). Furthermore, the number of temperature sampling terminals 22 can be multiple, and the multiple temperature sampling terminals 22 are spaced apart and distributed on the sampling element 21 along the stacking direction of the multiple battery cells 11.

[0044] Optionally, the sampling element 21 can be directly bonded and fixed on the battery stack 1; or, the sampling element 21 is connected and fixed on the battery stack 1 through the insulating connection component 5, a part of the insulating connection component 5 is located on the first side of the battery stack 1, and another part of the insulating connection component 5 is located on the second side of the battery stack 1, and the sampling element 21 can be connected and fixed to the first side and the second side of the battery stack 1 respectively through the insulating connection component 5. Further, when the sampling element 21 is connected and fixed on the battery stack 1 through the insulating connection component 5, the insulating connection component 5 includes a first hot pressing film 51 and a second hot pressing film 52, at least a part of the sampling element 21 and at least a part of the connecting sheet 3 are sandwiched between the first hot pressing film 51 and the second hot pressing film 52, and the first hot pressing film 51 and the second hot pressing film 52 are both provided with a second opening 53 corresponding to the connecting sheet 3, and the second opening 53 is provided to facilitate the welding operation, especially when the connecting sheet 3 is welded to the bar sheet, the tooling can enter from the second opening 53, and the welding operation is simple and convenient. Furthermore, the first hot pressing film 51 and the second hot pressing film 52 can both be in an inverted L shape, with one end of the first hot pressing film 51 located on the first side of the battery cell stack 1, and the other end of the first hot pressing film 51 being bent and extended and located on the second side of the battery cell stack 1, and one end of the second hot pressing film 52 being located on the first side of the battery cell stack 1, and the other end of the second hot pressing film 52 being bent and extended and located on the second side of the battery cell stack 1.

[0045] Optionally, at least part of the bar sheet is sandwiched between the first hot pressing film 51 and the second hot pressing film 52. Further, the part where the bar sheet is connected to the connecting sheet 3 is sandwiched between the first hot pressing film 51 and the second hot pressing film 52, and the part where the sampling element 21 is connected to the connecting sheet 3 is sandwiched between the first hot pressing film 51 and the second hot pressing film 52. The bar sheet, the sampling element 21 and the connecting sheet 3 are all sandwiched between the first hot pressing film 51 and the second hot pressing film 52, which is conducive to making the connection between the bar sheet, the sampling element 21 and the connecting sheet 3 more firm and reliable.

[0046] In the battery module of the above embodiment, the sampling element 21 is connected and fixed to the battery cell stack 1 through the insulating connection assembly 5. The connection is simple and reliable, which is conducive to improving the stability of the overall structure of the battery module.

[0047] See also Figures 1 to 7 In some optional embodiments, the present application provides a battery pack, comprising a battery module as described in any of the above embodiments.

[0048] In the battery module and battery pack of the utility model, the sampling component 2 and the pole 111 are respectively arranged on different sides of the battery cell stack 1, so that the installation space of the sampling component 2 is not limited by the pole 111, the installation of the sampling component 2 is more flexible, and the sampling component 2 and the pole 111 are connected by a connecting piece 3 with a first opening 31, which further reduces the difficulty of installation and improves the rationality of the layout of the battery module and the battery pack.

[0049] 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.

[0050] 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 module, characterized in that: include: A battery cell stack having a first side provided with a pole; A sampling component, wherein the sampling component is located on a second side of the battery cell stack, the second side being different from the first side; as well as A connecting piece, wherein a first opening is formed on the connecting piece, and a portion of the connecting piece where the first opening is formed is bent so that two ends of the connecting piece are respectively distributed on the first side and the second side of the battery cell stack, and the two ends of the connecting piece are respectively electrically connected to the pole and the sampling assembly.

2. The battery module according to claim 1, characterized in that: The connecting sheet is provided with a plurality of the first openings, and the plurality of the first openings are arranged side by side and spaced apart along the width direction of the connecting sheet.

3. The battery module according to claim 1, characterized in that: The width of the connecting sheet is D, the sum of the widths of the first openings is d, and 1 / 5D≤d≤5 / 6D.

4. The battery module according to claim 1, characterized in that: The connecting piece includes a first straight section, a bent section, and a second straight section. The first straight section and the second straight section are connected via the bent section. The first straight section is electrically connected to the sampling assembly, and the second straight section is electrically connected to the pole.

5. The battery module according to claim 4, characterized in that: The first opening includes a strip hole extending along the length direction of the connecting piece, the strip hole is arranged on the bending section, and two ends of the strip hole extend to the first straight section and the second straight section respectively.

6. The battery module according to claim 4, characterized in that: The first straight section is fixed to the sampling assembly by welding, and the second straight section is fixed to the pole by welding via a bar.

7. The battery module according to any one of claims 1 to 6, characterized in that: The sampling assembly includes a sampling element, which extends along the stacking direction of multiple battery cells in the battery cell stack; there are multiple connecting plates, which are spaced apart and electrically connected to the corresponding battery cells along the stacking direction of the multiple battery cells.

8. The battery module according to claim 7, characterized in that: The sampling element is connected and fixed on the battery cell stack through an insulating connection component; the insulating connection component includes a first hot pressing film and a second hot pressing film, at least a portion of the sampling element and at least a portion of the connecting piece are sandwiched between the first hot pressing film and the second hot pressing film, and the first hot pressing film and the second hot pressing film are both provided with a second opening corresponding to the connecting piece.

9. The battery module according to any one of claims 1 to 6, characterized in that: The first side and the second side of the battery cell stack are two sides perpendicular to each other.

10. The battery module according to any one of claims 1 to 6, characterized in that: The connecting sheet includes a nickel sheet.

11. A battery pack, characterized in that: Comprising the battery module according to any one of claims 1 to 10.

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