Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack. The battery module comprises a battery cell group formed by stacking a plurality of single battery cells, a convex part and a concave part are respectively arranged on two large surfaces of each single battery cell, and the size of the convex part is larger than that of the concave part in the thickness direction of the single battery cell; every two adjacent single battery cells are in plug-in fit through the convex part formed on one single battery cell and the concave part formed on the other single battery cell, the convex parts are connected with the concave parts in a bonding manner, and a certain gap is formed between every two adjacent single battery cells. The battery module provided by the utility model can solve the problem that the process is complicated when the battery cells are grouped in the prior art, so that the grouping efficiency of the battery module is favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery module. At the same time, the utility model also relates to a battery pack provided with the battery module. Background Art

[0002] As the main power source of new energy vehicles, the power battery cell group has also become the core component and technology of electric vehicles. At present, in order to meet the large-capacity demand of power batteries, multiple battery cells are often combined together to form a battery module to meet the working requirements of electric vehicles.

[0003] At present, when the battery cells are grouped, a steel tie is generally used to bind the battery cells by double-layer splicing and welding. However, the existing steel tie uses the double-layer splicing and welding method, and the operation process is complicated, which is not conducive to improving the grouping efficiency between the battery cells. Summary of the Utility Model

[0004] In view of this, the utility model aims to provide a battery module to improve the grouping efficiency between the battery cells.

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

[0006] It includes a battery cell group formed by stacking multiple single battery cells together;

[0007] Protrusions and depressions are respectively provided on two large surfaces of each single battery cell. In the thickness direction of the single battery cell, the size of the protrusion is larger than that of the depression;

[0008] Adjacent two single battery cells are in plug-in fit through the protrusion formed on one of the single battery cells and the depression formed on the other single battery cell, and the protrusion and the depression are adhesively connected, and a certain gap is formed between adjacent two single battery cells.

[0009] Further, the gap m between adjacent two single battery cells satisfies: 1mm ≤ m ≤ 2mm.

[0010] Further, the pole columns and explosion-proof valves on each single battery cell are respectively arranged at the bottom end and the top end of the single battery cell;

[0011] The battery cell group is provided with a module pressing member for pressing on each single battery cell. A first cavity is formed in the module pressing member, and the first cavity is communicated with each explosion-proof valve in the battery cell group through a communication hole.

[0012] Further, a plurality of communication holes are formed in the module pressing member and arranged at intervals, and the plurality of communication holes correspond to the plurality of explosion-proof valves in the battery cell group one by one.

[0013] Further, it further includes a lower housing having a receiving cavity;

[0014] The battery cell group is received in the receiving cavity. Two ends of the module pressing member are respectively connected to opposite side beams on the lower housing, and the first cavity is communicated with a second cavity formed in the side beams.

[0015] Further, the lower housing includes a bottom plate for supporting the battery cell group, and the side beams are a plurality of side beams arranged on the circumference of the bottom plate. The bottom plate and the plurality of side beams enclose to form the receiving cavity.

[0016] Further, heat insulation plates are provided between two ends of the battery cell group along the stacking direction of the single battery cells and the corresponding side beams.

[0017] Further, the battery cell group and the heat insulation plate, and / or, the heat insulation plate and the side beam are adhesively connected.

[0018] Further, the battery cell groups are a plurality of battery cell groups arranged side by side, and a strengthening connecting plate is provided between two adjacent battery cell groups.

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

[0020] In the battery module of the utility model, by respectively providing a convex portion and a concave portion on two large surfaces of the single battery cell, the plug-in fit between the convex portion and the concave portion can be utilized to realize the connection between two adjacent battery cells, and the convex portion and the concave portion are adhesively connected, thereby facilitating the assembly of the battery cell group and solving the problem of cumbersome procedures in the prior art when forming the battery cells into a group, thus facilitating the improvement of the battery cell forming efficiency.

[0021] Secondly, the gap between two adjacent single battery cells is set between 1 and 2 mm, with a reasonable structure, which can improve the cycle life of the single battery cell and contribute to cost reduction and efficiency improvement. The pole column and the explosion-proof valve are respectively provided at the bottom end and the top end of the single battery cell, which is convenient for realizing thermal and electrical separation, and the first cavity in the module pressing member is communicated with the explosion-proof valve through the communication hole, which can ensure the stability of the battery cell while facilitating the discharge of the gas generated by the thermal runaway of the single battery cell, thus facilitating the improvement of the safety of the battery pack. Making the communication holes correspond to the explosion-proof valves one by one is conducive to the discharge of the thermal runaway gas of each single battery cell, thereby improving the heat dissipation efficiency and further facilitating the improvement of the safety performance of the battery pack.

[0022] Furthermore, by connecting both ends of the module pressing member to the two side beams on the lower housing respectively, the first cavity is communicated with the second cavity in the side beam, which is beneficial to the discharge of gas from the battery pack along the first cavity and the second cavity, thus facilitating the realization of thermoelectric separation and further enhancing the safety of the battery pack. The split design between the bottom plate and the side beam is convenient for disassembly and assembly, thus facilitating the improvement of work efficiency.

[0023] Moreover, a heat preservation board is arranged between the battery cell group and the side beam, which is beneficial to improving the heat preservation performance of the battery pack. At the same time, the stiffness of the battery pack is ensured, which is beneficial to enhancing the safety of the battery pack. Both between the battery cell group and the heat preservation board and between the heat preservation board and the side beam are connected by bonding, which can improve the connection strength between the battery cell group and the heat preservation board and between the heat preservation board and the side beam, and at the same time can improve the connection efficiency. A reinforcing connecting plate is arranged between two adjacent battery cell groups, which is beneficial to enhancing the structural strength of the battery pack, thus facilitating the improvement of the safety of the battery pack.

[0024] In addition, another object of the present utility model is to provide a battery pack, in which the above-mentioned battery module is provided.

[0025] The battery pack of the present utility model and the above-mentioned battery module have the same beneficial effects compared with the traditional technology, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0027] Figure 1 is a schematic diagram of the overall structure of the battery module according to an embodiment of the present utility model;

[0028] Figure 2 is Figure 1 a cross-sectional view taken along the line A-A in

[0029] Figure 3 is Figure 2 a schematic diagram from another perspective of

[0030] Figure 4 is a schematic diagram of the structure of the single battery cell according to an embodiment of the present utility model;

[0031] Figure 5 is Figure 4 a schematic diagram of the structure shown from another perspective;

[0032] Description of the reference numerals:

[0033] 1. Lower housing; 11. Bottom plate; 12. Side beam; 121. Second cavity; 13. Module pressing member; 131. First cavity; 132. Communication hole; 14. Accommodation cavity;

[0034] 2. Battery cell group; 21. Single battery cell; 211. Protrusion; 212. Depression; 213. Terminal; 214. Explosion-proof valve; 22. Reinforcing connecting plate; 23. Heat preservation plate;

[0035] 3. Reinforcing rib;

[0036] m. Thickness dimension of the gap. Detailed implementation manners

[0037] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0038] In the description of the present invention, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] Taking the battery pack mounting point structure described in the present invention as an example, the orientation words such as "upper, lower, left, right, front, back" used in the embodiments are defined based on the Figure 1 up and down direction (also known as the height direction, or the overall package Z direction), left and right direction (also known as the width direction, or the overall package Y direction), and front and back direction (also known as the length direction, or the overall package X direction) in the state shown in the Figure 1 drawings. "Inner" and "outer" are defined based on the contour of the corresponding component. For example, "inner" and "outer" defined based on the contour of the battery pack, with the side where the middle cross beam is located being "inner" and vice versa being "outer".

[0040] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connecting piece" 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 it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with the specific situations.

[0041] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0042] Embodiment 1

[0043] This embodiment relates to a battery module, which can solve the problem of complicated processes when battery cells are grouped in the prior art, so as to be conducive to improving the grouping efficiency of the battery module. In terms of the overall structure, as Figures 1 to 5 shown, the battery module of this embodiment includes a battery cell group 2 formed by stacking a plurality of single battery cells 21 together.

[0044] Among them, a convex portion 211 and a concave portion 212 are respectively provided on the two large surfaces of each single battery cell 21. In the thickness direction of the single battery cell 21, the size of the convex portion 211 is larger than that of the concave portion 212. The adjacent two single battery cells 21 are inserted and matched through the convex portion 211 formed on one single battery cell 21 and the concave portion 212 formed on the other single battery cell 21, and the convex portion 211 and the concave portion 212 are adhesively connected, and a certain gap is formed between the adjacent two single battery cells 21.

[0045] It is worth mentioning that the number of single battery cells 21 in this embodiment can be designed and adjusted according to actual needs. For example, it can be set to four or five.

[0046] At this time, with the above settings, by respectively providing the convex portion 211 and the concave portion 212 on the two large surfaces of the single battery cell 21, the connection between two adjacent battery cells can be realized by using the insertion and matching between the convex portion 211 and the concave portion 212, and the convex portion 211 and the concave portion 212 are adhesively connected. Thus, the grouping efficiency between the battery cells can be improved.

[0047] During specific implementation, the convex portion 211 of one single battery cell 21 is inserted into the concave portion 212 of the other single battery cell 21, and the two are adhesively bonded through an adhesive. And the adhesive in this embodiment can adopt adhesive products well-known to those skilled in the art, such as double-sided tape, etc.

[0048] Based on the above overall introduction, in this embodiment, as a preferred implementation form, as Figure 3 shown, the gap m between the adjacent two single battery cells 21 satisfies: 1mm ≤ m ≤ 2mm. The advantage of such a setting is that it can improve the cycle life of the single battery cell 21 and contribute to cost reduction and efficiency improvement.

[0049] Here, the specific value of the gap m can be designed and adjusted according to actual needs. For example, it can be set to 1.5mm. It should be noted that if the gap m is too large, it is not conducive to realizing the compact layout of the battery pack, and if the gap m is too small, it is not conducive to improving the heat dissipation effect between the single battery cells 21.

[0050] In addition, in this embodiment, as a preferred implementation form, referring to Figure 4 and Figure 5 as shown, the pole columns 213 and the explosion-proof valves 214 on each single cell 21 are respectively arranged at the bottom end and the top end of the single cell 21. With this arrangement, it is convenient to achieve thermoelectric separation, thereby facilitating the improvement of the safety of the battery pack.

[0051] Meanwhile, continuing to refer to Figure 1 、 Figure 2 and Figure 3 as shown, a module pressing member 13 for pressing on each single cell 21 is arranged on the cell group 2. A first cavity 131 is formed in the module pressing member 13, and the first cavity 131 communicates with each explosion-proof valve 214 in the cell group 2 through a communication hole 132.

[0052] Here, by making the first cavity 131 in the module pressing member 13 communicate with the explosion-proof valve 214 through the communication hole 132, while ensuring the stability of the single cell 21, it is convenient to discharge the gas generated by the thermal runaway of the single cell 21, thereby facilitating the improvement of the safety of the battery pack.

[0053] Specifically, in this embodiment, as a preferred implementation form, continuing to refer to Figure 3 as shown, the communication holes 132 are multiple and arranged at intervals on the module pressing member 13, and the multiple communication holes 132 correspond to the multiple explosion-proof valves 214 in the cell group 2 one by one. Thus, making the communication holes 132 correspond to the explosion-proof valves 214 one by one is conducive to the discharge of the thermal runaway gas of each single cell 21, thereby improving the heat dissipation efficiency and further facilitating the improvement of the safety performance of the battery pack.

[0054] In a specific structure, the module pressing member 13 can adopt a rectangular plate well-known to those skilled in the art. Of course, in addition to using a rectangular plate, it can also be set to other common shapes, such as a "channel" - shaped plate, etc., as long as it can ensure gas discharge.

[0055] In addition, in this embodiment, as a preferred implementation form, referring to what is shown in the figure, it further includes a lower housing 1 having a receiving cavity 14. And, the cell group 2 is received in the receiving cavity 14. Both ends of the module pressing member 13 are respectively connected to two opposite side beams 12 on the lower housing 1, and the first cavity 131 communicates with a second cavity 121 formed in the side beam 12.

[0056] Here, by respectively connecting both ends of the module pressing member 13 to the two side beams 12 on the lower housing 1, making the first cavity 131 communicate with the second cavity 121 in the side beam 12, it is conducive to the gas discharging from the battery pack along the first cavity 131 and the second cavity 121, thereby facilitating the achievement of thermoelectric separation and further facilitating the improvement of the safety of the battery pack.

[0057] During specific implementation, the first cavity 131 communicates with the second cavity 121. The gas generated by each single cell 21 enters the first cavity 131 through the communication hole 132, flows into the second cavity 121 through the first cavity 131, and then flows out of the battery pack through the second cavity 121, ensuring the safety of the battery pack.

[0058] Secondly, in this embodiment, as a preferred implementation form, as Figure 1 shown, the lower shell 1 includes a bottom plate 11 for supporting the battery cell group 2, and a plurality of side beams 12 are arranged on the circumference of the bottom plate 11. The bottom plate 11 and the plurality of side beams 12 enclose a receiving cavity 14.

[0059] With this setting, by enclosing the bottom plate 11 and each side beam 12 to form the receiving cavity 14, its structure is simple and easy to design and implement. Moreover, the bottom plate 11 and the side beams 12 adopt a split design, which is convenient for disassembly and assembly, thus facilitating the improvement of work efficiency.

[0060] Here, the specific number of the side beams 12 can be designed and adjusted according to actual setting requirements. For example, it can be set to two. During specific implementation, the bottom plate 11 and the side beams 12 can be connected by screwing. Of course, in addition to screwing, other common connection forms can also be used.

[0061] It is worth mentioning that the relevant structural parts not mentioned in this embodiment can refer to the battery pack structure in the prior art, such as the reinforcing ribs 3 arranged in the bottom plate 11 and each side beam 12.

[0062] Moreover, considering the rigidity requirement of the battery pack, in this embodiment, as a preferred implementation form, as Figure 1 and Figure 2 shown, heat insulation plates 23 are provided between the two ends of the battery cell group 2 along the stacking direction of the single cells 21 and the corresponding side beams 12. Here, setting the heat insulation plates 23 between the battery cell group 2 and the side beams 12 is beneficial to improving the heat insulation performance of the battery pack, and at the same time ensures the stiffness of the battery pack, which is beneficial to improving the safety of the battery pack.

[0063] It is worth mentioning that the stacking direction in this embodiment is the direction in which the concave part 212 of the single cell 21 points to the convex part 211 itself. Through the above design, the grouping efficiency of the single cells 21 can be improved, and the stable connection between the battery cell group 2 and the heat insulation plates 23 can be enhanced.

[0064] Furthermore, as a preferred implementation form, still as Figure 1 and Figure 2As shown, between the battery cell group 2 and the heat preservation board 23, and between the heat preservation board 23 and the side beam 12 in this embodiment, there is an adhesive connection. Thus, both between the battery cell group 2 and the heat preservation board 23, and between the heat preservation board 23 and the side beam 12 are connected by adhesion, which can improve the connection strength between the battery cell group 2 and the heat preservation board 23, and between the heat preservation board 23 and the side beam 12, and at the same time can also improve the connection efficiency.

[0065] In addition, in this embodiment, as a preferred implementation form, refer to Figure 1 , Figure 2 and Figure 3 As shown, there are multiple battery cell groups 2 arranged side by side, and a reinforcing connection board 22 is provided between adjacent two battery cell groups 2. Here, providing a reinforcing connection board 22 between adjacent two battery cell groups 2 is beneficial to improving the structural strength of the battery pack, thus facilitating the improvement of the safety of the battery pack.

[0066] It is still worth mentioning that on the side where the single battery cell 21 is adhesively connected to the reinforcing connection board 22, and on the side where the single battery cell 21 is adhesively connected to the heat preservation board 23, the above-mentioned concave portions 212 are provided. By this setting, it can facilitate the adhesion between the single battery cell 21 and the reinforcing connection board 22, and between the single battery cell 21 and the heat preservation board 23, and can also improve the connection strength between the single battery cell 21 and the reinforcing connection board 22, and between the single battery cell 21 and the heat preservation board 23.

[0067] When the battery module of this embodiment is specifically implemented, the convex portion 211 of one single battery cell 21 is adhesively connected to the concave portion 212 of another single battery cell 21, and in this way, four single battery cells 21 are adhesively connected together to form the battery cell group 2. And in this embodiment, the battery cell group 2 can preferably be set to two, and the two battery cell groups 2 are adhesively connected through the reinforcing connection board 22.

[0068] After the two battery cell groups 2 are adhesively connected, they are placed in the accommodation cavity 14. At this time, heat preservation boards 23 are adhesively connected to each side beam 12, and one end of each battery cell group 2 away from the reinforcing connection board 22 is adhesively connected to the heat preservation board 23 to complete the grouping of the single battery cells 21.

[0069] Embodiment Two

[0070] This embodiment relates to a battery pack, and the battery module in Embodiment One is provided in this battery pack.

[0071] The battery pack of this embodiment, by setting the battery module in Embodiment One, can facilitate the assembly of the battery cell group, and is also beneficial to improving the grouping efficiency of the battery cells, and has a good use effect.

[0072] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery module, characterized in that: It includes a battery cell group formed by stacking a plurality of single battery cells together; On each of the two large surfaces of each single battery cell, a convex portion and a concave portion are respectively provided. In the thickness direction of the single battery cell, the size of the convex portion is larger than that of the concave portion; Between two adjacent single battery cells, the convex portion formed on one of the single battery cells is inserted and matched with the concave portion formed on the other single battery cell, and the convex portion and the concave portion are adhesively connected, and a certain gap is formed between two adjacent single battery cells.

2. The battery module according to claim 1, characterized in that: The gap m between two adjacent single battery cells satisfies: 1 mm ≤ m ≤ 2 mm.

3. The battery module according to claim 1, characterized in that: The pole columns and explosion-proof valves on each single battery cell are respectively arranged at the bottom end and the top end of the single battery cell; On the battery cell group, a module pressing member for pressing on each single battery cell is provided. A first cavity is formed in the module pressing member, and the first cavity is communicated with each explosion-proof valve in the battery cell group through a communication hole.

4. The battery module according to claim 3, characterized in that: The communication holes are a plurality of spaced-apart ones formed on the module pressing member, and the plurality of communication holes correspond to the plurality of explosion-proof valves in the battery cell group one by one.

5. The battery module according to claim 3, characterized in that: It further includes a lower shell having a receiving cavity; The battery cell group is received in the receiving cavity. Two ends of the module pressing member are respectively connected to opposite side beams on the lower shell, and the first cavity is communicated with a second cavity formed in the side beam.

6. The battery module according to claim 5, characterized in that: The lower shell includes a bottom plate for supporting the battery cell group, and the side beams are a plurality of arranged on the circumference of the bottom plate. The bottom plate and the plurality of side beams enclose to form the receiving cavity.

7. The battery module according to claim 5, characterized in that: Heat insulation plates are provided between the two ends of the battery cell group along the stacking direction of the single battery cells and the corresponding side beams.

8. The battery module according to claim 7, characterized in that: Between the battery cell group and the heat insulation plate, and / or, between the heat insulation plate and the side beam, they are adhesively connected.

9. The battery module according to any one of claims 1 to 8, characterized in that: The battery cell groups are a plurality of arranged side by side, and a strengthening connecting plate is provided between two adjacent battery cell groups.

10. A battery pack, characterized in that: The battery pack is provided with the battery module according to any one of claims 1-9.

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