Battery module and battery pack

Abstract

The utility model discloses a battery module and a battery pack. The battery module comprises a plurality of single batteries which are arranged along a first direction, and each single battery is provided with a pole and an anti-explosion valve which are arranged along a second direction; the busbar is connected with the pole columns of the plurality of battery monomers and is arranged at intervals with the anti-explosion valve along a second direction; the collecting device comprises a flexible circuit board, the flexible circuit board is connected with the busbar and located on the side, facing the anti-explosion valve, of the busbar, the flexible circuit board and the anti-explosion valve are spaced in the second direction and comprise a connecting part and a folding part, and the folding part and the connecting part are arranged in the third direction; and at least part of the fixing piece is located on the side, away from the battery single body, of the flexible circuit board, and the projection of the fixing piece on the reference surface at least partially coincides with the projection of the folding part on the reference surface. According to the battery module disclosed by the utility model, the flexible circuit board can be prevented from shielding the anti-explosion valve, so that the flexible circuit board is prevented from being damaged due to the fact that high-temperature and high-pressure gas released by the anti-explosion valve impacts the flexible circuit board.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, and in particular to a battery module and a battery pack. Background Technology

[0002] The vehicle's power battery pack provides the power source for electric vehicles. To monitor the battery pack's charge and temperature status, it is necessary to collect voltage and temperature data from individual battery cells. Flexible printed circuit boards (FPCBs) are a commonly used data collection method due to their high wiring density, light weight, thin stacking, and good flexibility. However, space constraints exist. For example, in blade battery modules, to ensure the size of the flexible circuit board, it needs to occupy space above the explosion-proof valve. This means the flexible circuit board can obstruct the explosion-proof valve, and the impact force generated when the valve releases gas can easily damage the flexible circuit board. Utility Model Content

[0003] The first aspect of this utility model provides a battery module that has the advantage of preventing damage to the flexible circuit board when the explosion-proof valve releases pressure.

[0004] A battery module according to a first aspect of the present invention includes: a plurality of battery cells arranged along a first direction, each battery cell having a terminal post and an explosion-proof valve arranged along a second direction, the second direction being perpendicular to the first direction; a busbar connected to the terminals of the plurality of battery cells and spaced apart from the explosion-proof valve along the second direction; a data acquisition device including a flexible circuit board connected to the busbar and located on the side of the busbar facing the explosion-proof valve, the flexible circuit board being spaced apart from the explosion-proof valve along the second direction and including a connecting portion and a folding portion, the connecting portion being connected to the busbar, the folding portion and the connecting portion being arranged along a third direction, the third direction being perpendicular to the first direction and the second direction; and a fixing member fixedly connected to the busbar, at least a portion of the fixing member being located on the side of the flexible circuit board away from the battery cells, the projection of the fixing member on a reference surface at least partially coinciding with the projection of the folding portion on the reference surface, the reference surface being perpendicular to the third direction.

[0005] According to the battery module of the first aspect of this utility model, the flexible circuit board can be stably kept in a folded state by means of a fixing member. By folding and fixing the flexible circuit board in the area between the busbar and the explosion-proof valve, the size of the flexible circuit board can be guaranteed while avoiding the flexible circuit board from blocking the explosion-proof valve. This can better prevent the high-temperature and high-pressure gas released by the battery cell through the explosion-proof valve from impacting the flexible circuit board and causing damage to the flexible circuit board, thereby ensuring the safety of the flexible circuit board.

[0006] According to some embodiments of the present invention, in the third direction, the folding portion is located on the side of the connecting portion away from the battery cell, and at least a portion of the fixing member is located on the side of the folding portion away from the connecting portion and is connected to the folding portion.

[0007] According to some embodiments of the present invention, the battery module further includes a support member, which is stacked between the folded portion and the connecting portion and abuts against the folded portion and the connecting portion.

[0008] According to some embodiments of the present invention, the thickness of the support member is not less than 0.5 mm; and / or, the support member is a cushioning material.

[0009] According to some embodiments of the present invention, the battery module further includes: a first double-sided adhesive, which is stacked between the folded portion and the connecting portion and is adhesively bonded to the folded portion and the connecting portion.

[0010] According to some embodiments of the present invention, the battery module further includes: a second double-sided adhesive, which is stacked between the fixing member and the flexible circuit board and is adhesively connected to the fixing member and the flexible circuit board; and / or, in the third direction, a buffer is provided on the side of the fixing member facing the flexible circuit board.

[0011] According to some embodiments of the present invention, at least one of the fixing members is disposed at the middle of the flexible circuit board in the length direction.

[0012] According to some embodiments of the present invention, the fixing member has a plurality of components arranged along the length direction of the flexible circuit board.

[0013] According to some embodiments of the present invention, the battery module further includes an insulating bracket, the busbar is disposed on the side of the insulating bracket away from the battery cell, the fixing member and the insulating bracket are both plastic parts, and the fixing member is thermally riveted to the insulating bracket.

[0014] The second aspect of this utility model proposes a battery pack.

[0015] The battery pack according to a second aspect of the present invention includes: the battery module described above.

[0016] According to the battery pack of the second aspect of this utility model, the flexible circuit board can be stably kept in a folded state by means of a fastener. By folding and fixing the flexible circuit board in the area between the busbar and the explosion-proof valve, the size of the flexible circuit board can be guaranteed while avoiding the flexible circuit board from blocking the explosion-proof valve. This can better prevent the high-temperature and high-pressure gas released by the battery cells through the explosion-proof valve from impacting the flexible circuit board and causing damage to the flexible circuit board, thereby ensuring the safety of the flexible circuit board.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a battery module according to an embodiment of the present utility model;

[0019] Figure 2 This is a side view of the fixing and folding part of the fixing member of the battery module according to an embodiment of the present utility model;

[0020] Figure 3 yes Figure 2 Enlarged view of region A in the middle;

[0021] Figure 4 This is a partial schematic diagram of the position of the fixing component of the battery module according to an embodiment of the present utility model;

[0022] Figure 5 This is a front view of the fixing component of the battery module according to an embodiment of the present utility model.

[0023] Figure label:

[0024] 100. Battery module;

[0025] 1. Battery cell; 11. Explosion-proof valve; 2. Busbar; 3. Flexible circuit board; 31. Connecting part; 32. Folding part; 4. Fixing part; 41. Connecting hole; 5. Supporting part; 6. Buffering part; 7. Insulating bracket; e1. First direction; e2. Second direction; e3. Third direction. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying 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 with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0027] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0028] The battery module 100 according to a first aspect embodiment of the present invention is described below with reference to the accompanying drawings.

[0029] like Figures 1 to 5 As shown, the battery module 100 according to the first aspect embodiment of the present invention includes: a plurality of battery cells 1 arranged along a first direction e1, a busbar 2, a data collection device, and a fixing member 4. Each battery cell 1 is provided with terminals and an explosion-proof valve 11 arranged along a second direction e2, the second direction e2 being perpendicular to the first direction e1. The explosion-proof valve 11 can promptly discharge high-temperature, high-pressure gas from the battery cell 1 in the event of thermal runaway to prevent combustion and explosion of the battery cell 1. The busbar 2 is connected to the terminals of the plurality of battery cells 1 and to the explosion-proof valve 4. Valve 11 is arranged at intervals along the second direction e2 to collect the current from multiple battery cells 1 through busbar 2 to supply power to the electrical device. The data collection device includes a flexible circuit board 3, which is connected to busbar 2 and located on the side of busbar 2 facing the explosion-proof valve 11. The flexible circuit board 3 is spaced apart from the explosion-proof valve 11 along the second direction e2 and includes a connecting portion 31 and a folding portion 32. The connecting portion 31 is connected to busbar 2, and the folding portion 32 and the connecting portion 31 are arranged along a third direction e3, which is perpendicular to the first direction e1 and the second direction e2. That is, the flexible circuit board 3 is folded and arranged in the area between busbar 2 and explosion-proof valve 11. For example, the folding portion 32 can be formed by folding the part of the flexible circuit board 3 near the explosion-proof valve 11 toward the direction away from the explosion-proof valve 11, and the unfolded part constitutes the connecting portion 31. The folding portion 32 is spaced apart from the explosion-proof valve 11 along the second direction e2.

[0030] It is understandable that in related technologies, when there is insufficient space on the side of the battery where the explosion-proof valve is located, such as when the battery cell is a blade battery, the terminals and the explosion-proof valve are located at both ends of the blade battery in the length direction. However, the space on both sides of the blade battery in the length direction is insufficient, which can easily cause the flexible circuit board to occupy the space outside the explosion-proof valve, thus obstructing the explosion-proof valve. However, the flexible circuit board needs to have sufficient dimensions, such as width, to ensure the reliability of signal transmission, which makes the placement of the flexible circuit board difficult.

[0031] In this application, by folding and fixing the flexible circuit board 3 in the area between the busbar 2 and the explosion-proof valve 11, the size of the flexible circuit board 3 can be ensured to be the same as its width in the unfolded state, while reducing the installation space occupied by the flexible circuit board 3 in the second direction e2 so that the flexible circuit board 3 and the explosion-proof valve 11 are arranged at intervals. This avoids the flexible circuit board 3 blocking the explosion-proof valve 11. Therefore, when the pressure inside the battery cell 1 increases and releases the pressure through the explosion-proof valve 11, the high-temperature and high-pressure gas released by the battery cell 1 through the explosion-proof valve 11 can be better prevented from impacting the flexible circuit board 3 and causing damage to the flexible circuit board 3, thus ensuring the safety of the flexible circuit board 3.

[0032] Furthermore, the fastener 4 is fixedly connected to the busbar 2, and at least a portion of the fastener 4 is located on the side of the flexible circuit board 3 away from the battery cell 1. The projection of the fastener 4 on the reference plane at least partially coincides with the projection of the folded portion 32 on the reference plane, and the reference plane is perpendicular to the third direction e3. Therefore, the fastener 4 can stably limit the flexible circuit board 3 to keep it stably in a folded state.

[0033] According to the battery module 100 of the first aspect of the present invention, the flexible circuit board 3 can be stably kept in a folded state by means of the fixing member 4. By folding and fixing the flexible circuit board 3 in the area between the busbar 2 and the explosion-proof valve 11, the size of the flexible circuit board 3 can be guaranteed while avoiding the flexible circuit board 3 from blocking the explosion-proof valve 11. This can better prevent the high temperature and high pressure gas released by the battery cell 1 through the explosion-proof valve 11 from impacting the flexible circuit board 3 and causing damage to the flexible circuit board 3, so as to ensure the safety of the flexible circuit board 3.

[0034] According to some embodiments of this utility model, on the third direction e3, the folding portion 32 is located on the side of the connecting portion 31 away from the battery cell 1, and at least a portion of the fixing member 4 is located on the side of the folding portion 32 away from the connecting portion 31 and connected to the folding portion 32. That is, the folding portion 32 can be formed by bending the end of the connecting portion 31 near the explosion-proof valve 11 in a direction away from the battery cell 1. By using the portion of the fixing member 4 located on the side of the folding portion 32 away from the connecting portion 31, a downward pressure can be applied to the folding portion 32 to prevent the folding portion 32 from deforming in the direction near the explosion-proof valve 11, thereby stably keeping the flexible circuit board 3 in a folded state.

[0035] According to some embodiments of this utility model, the battery module 100 further includes a support member 5, which is stacked between the folding portion 32 and the connecting portion 31 and abuts against both the folding portion 32 and the connecting portion 31. That is, the support member 5 supports the folding portion 32 and the connecting portion 31 along a third direction e3, and the distance between the folding portion 32 and the connecting portion 31 can be better controlled by the support member 5. It is understood that if the folding portion 32 and the connecting portion 31 are too close together, such as when they are in contact, the folding position of the flexible circuit board 3, i.e., the connection position between the folding portion 32 and the connecting portion 31, will break. Therefore, by providing the support member 5, damage caused by excessive bending of the folding portion 32 can be prevented while ensuring the normal folding of the flexible circuit board 3.

[0036] According to some embodiments of this utility model, the thickness of the support member 5 is not less than 0.5mm. That is, the dimension of the support member 5 in the thickness direction of the flexible circuit board 3 is controlled within the range of 0.5mm or greater than 0.5mm. This avoids the risk of circuit breakage at the connection point between the folded portion 32 and the connecting portion 31 due to the support member 5 being too small in the thickness direction of the flexible circuit board 3, thus ensuring the safety of the circuit of the flexible circuit board 3. The dimension of the support member 5 in the thickness direction of the flexible circuit board 3 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc., and no specific limitation is made here.

[0037] According to some embodiments of this utility model, the support member 5 is a cushioning material. It is understood that the cushioning material can absorb impact force, thereby buffering the impact force acting on the flexible circuit board 3. Therefore, during the use of the battery module 100, such as when the battery module 100 is applied within a vehicle's battery pack, the cushioning material can prevent excessive bending of the folding portion 32, and when vehicle vibrations are transmitted to the flexible circuit board 3, it can prevent the flexible circuit board 3 from being damaged by excessive impact, thus ensuring the safety of the flexible circuit board 3. In one specific embodiment, the support member 5 is foam.

[0038] According to some embodiments of this utility model, the battery module 100 further includes a first double-sided adhesive, which is layered between the folding portion 32 and the connecting portion 31 and adhesively bonded to both. Thus, the first double-sided adhesive effectively maintains the relative position between the folding portion 32 and the connecting portion 31, keeping the flexible circuit board 3 in a folded state. Simultaneously, the adhesive bond between the folding portion 32 and the connecting portion 31 provides a good pre-positioning effect for the subsequent installation of the fixing component 4; that is, it is not necessary to hold the folding portion 32 when installing the fixing component 4, thereby reducing the installation difficulty of the fixing component 4 and improving the assembly efficiency of the battery module 100. Furthermore, the adhesive bonding method occupies less space, reducing the volume of the battery module 100.

[0039] In some embodiments, the support member 5 has adhesive layers on both sides in the thickness direction, i.e., the third direction e3. The support member 5 and the adhesive layers on both sides together form a first double-sided adhesive, so as to adhesively connect the support member 5 to the connecting part 31 and the folding part 32.

[0040] According to some embodiments of this utility model, the battery module 100 further includes a second double-sided adhesive, which is laminated between the fixing member 4 and the flexible circuit board 3 and adhesively bonded to both the fixing member 4 and the flexible circuit board 3. Thus, the second double-sided adhesive can effectively achieve a fixed connection between the folding part 32 and the fixing member 4, thereby improving the fixing effect of the fixing member 4 on the folding part 32. Furthermore, while ensuring a firm connection between the fixing member 4 and the folding part 32, it can reduce the space occupied.

[0041] According to some embodiments of this utility model, on the third-direction e3, a buffer member 6 is provided on the side of the fixing member 4 facing the flexible circuit board 3. That is, the buffer member 6 is stacked between the fixing member 4 and the flexible circuit board 3. It can be understood that the buffer material can absorb the impact force through deformation. Therefore, the buffer member 6 can absorb and buffer the impact force of the fixing member 4 on the flexible circuit board 3, and at the same time, it can prevent the fixing member 4 from directly contacting the folded part 32, thereby preventing the fixing member 4 from damaging the folded part 32. In a specific embodiment, the buffer member 6 is foam, the folded part 32 is located on the side of the connecting part 31 away from the battery cell 1, and the buffer member 6 fills the space between the folded part 32 and the fixing member 4.

[0042] In some embodiments, the buffer member 6 has adhesive layers on both sides in the thickness direction. The buffer member 6 and the adhesive layers on both sides together constitute a second double-sided adhesive, so as to facilitate the adhesive connection between the buffer member 6 and the folding part 32 and the fixing member 4.

[0043] According to some embodiments of this utility model, at least one fixing member 4 is disposed at the middle of the flexible circuit board 3 in the length direction. That is, at least one fixing member 4 fixes the folded part 32 at the middle of the length direction to maintain the folded state of the flexible circuit board 3. At the middle of the length direction, the fixing member 4 is located in the middle of the flexible circuit board 3, so that the fixing effect of the fixing member 4 on the folded part 32 can be more evenly applied to the areas on both sides of the folded part 32 located on the fixing member 4. Thus, while ensuring the fixing effect of the fixing member 4 on the folded part 32, the number of fixing members 4 can be reduced to reduce the cost of the battery module 100. At the same time, the assembly process of multiple fixing members 4 can be reduced, that is, the assembly process of the battery module 100 can be simplified to improve the assembly efficiency of the battery module 100.

[0044] According to some embodiments of this utility model, the fixing member 4 is provided with multiple members arranged along the length direction of the flexible circuit board 3. The length direction of the flexible circuit board 3 is the first direction e1, that is, the multiple fixing members 4 can fix the folded part 32 at multiple positions in the length direction, thereby improving the fixing effect of the folded part 32 and better keeping the flexible circuit board 3 in a folded state.

[0045] According to some embodiments of this utility model, the battery module 100 further includes an insulating bracket 7, with a busbar 2 disposed on the side of the insulating bracket 7 away from the battery cell 1. Both the fixing member 4 and the insulating bracket 7 are plastic parts, and the fixing member 4 is thermally riveted to the insulating bracket 7. This effectively reduces the space occupied by the connection structure between the insulating bracket 7 and the fixing member 4, while also preventing screws or other structures from puncturing the battery cell 1. In a specific example, the fixing member 4 is an injection-molded part, and the insulating bracket 7 is a blow-molded part. A connecting post is formed on the insulating bracket 7, and a connecting hole 41 is formed on the fixing member 4. The connecting post passes through the connecting hole 41, and by heating the connecting post to deform it, a fixed connection is formed between the connecting post and the fixing member 4.

[0046] The battery pack according to a second aspect of the present invention is described below with reference to the accompanying drawings.

[0047] A battery pack according to a second aspect of the present invention includes a battery module 100.

[0048] According to the battery pack of the second aspect of the present invention, the flexible circuit board 3 can be stably kept in a folded state by the fixing member 4. By folding and fixing the flexible circuit board 3 in the area between the busbar 2 and the explosion-proof valve 11, the size of the flexible circuit board 3 can be guaranteed while avoiding the flexible circuit board 3 from blocking the explosion-proof valve 11. This can better prevent the high temperature and high pressure gas released by the battery cell 1 through the explosion-proof valve 11 from impacting the flexible circuit board 3 and causing damage to the flexible circuit board 3, so as to ensure the safety of the flexible circuit board 3.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery module, characterized by, include: Multiple battery cells arranged along a first direction, wherein each battery cell is provided with a terminal post and an explosion-proof valve arranged along a second direction, the second direction being perpendicular to the first direction; The busbar is connected to the terminals of multiple battery cells and is spaced apart from the explosion-proof valve along the second direction; The data acquisition device includes a flexible circuit board connected to the busbar and located on the side of the busbar facing the explosion-proof valve. The flexible circuit board and the explosion-proof valve are spaced apart along the second direction and include a connecting portion and a folding portion. The connecting portion is connected to the busbar, and the folding portion and the connecting portion are arranged along a third direction, which is perpendicular to the first direction and the second direction. A fixing member is fixedly connected to the busbar. At least a portion of the fixing member is located on the side of the flexible circuit board away from the battery cell. The projection of the fixing member on the reference surface at least partially coincides with the projection of the folded portion on the reference surface. The reference surface is perpendicular to the third direction.

2. The battery module of claim 1, wherein, In the third direction, the folding portion is located on the side of the connecting portion away from the battery cell, and at least a portion of the fastener is located on the side of the folding portion away from the connecting portion and is connected to the folding portion.

3. The battery module of claim 1, wherein, It also includes a support member, which is stacked between the folded portion and the connecting portion and abuts against the folded portion and the connecting portion.

4. The battery module of claim 3, wherein, The thickness of the support member is not less than 0.5 mm; and / or, the support member is a cushioning material.

5. The battery module of claim 1, wherein, Also includes: A first double-sided adhesive is layered between the folded portion and the connecting portion and is adhesively bonded to the folded portion and the connecting portion.

6. The battery module of claim 1, wherein, Also includes: A second double-sided adhesive is laminated between the fixing member and the flexible circuit board and is adhesively bonded to both the fixing member and the flexible circuit board; and / or, in the third direction, a buffer is provided on the side of the fixing member facing the flexible circuit board.

7. The battery module of claim 1, wherein, At least one of the fasteners is located at the middle of the flexible circuit board in the length direction.

8. The battery module of claim 1, wherein, The fasteners are provided in multiple configurations arranged along the length of the flexible circuit board.

9. The battery module of claim 1, wherein, It also includes an insulating bracket, the busbar is located on the side of the insulating bracket away from the battery cell, the fixing member and the insulating bracket are both plastic parts, and the fixing member is thermally riveted to the insulating bracket.

10. A battery pack, characterized by, include: The battery module according to any one of claims 1-9.

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