A battery cell module and a battery system

Abstract

The present invention belongs to the technical field of batteries, and discloses a battery cell module and a battery system. The battery cell module includes a plurality of battery cell unit components. Each battery cell unit component includes a battery cell, an end cover and a base. One end of the battery cell is connected to the end cover, and the other end of the battery cell is connected to the base. The end covers of adjacent battery cell unit components are detachably connected, and the bases of adjacent battery cell unit components are detachably connected. Each battery cell is provided with an end cover and a base. The detachable connection of adjacent end covers and adjacent bases enables multiple battery cells to be grouped. The assembly of the battery cell module is convenient, which is beneficial to improving the relative position accuracy between battery cells, thereby improving the assembly accuracy of the battery cell module. The battery system adopts the above battery cell module, which has high processing accuracy and reliable structure.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a battery cell module and a battery system. Background Art

[0002] In recent years, new energy vehicles have achieved leapfrog development, especially new energy vehicles powered by lithium batteries. Cylindrical battery cells in lithium batteries are widely used in power systems. Due to their small single-cell capacity, a large number of single-strand batteries are required.

[0003] In common cylindrical battery cell modules, the battery cells are positioned by a tooling and then bonded together with glue. This results in inaccurate positioning of the battery cells, affecting the positioning accuracy of adjacent battery cells, and thus leading to a large cumulative tolerance.

[0004] In addition, in existing battery cell modules, multiple battery cells are not arranged compactly, and the overall size is relatively large; in existing battery cell modules, the negative electrode ends of the battery cells are blocked. If a thermal runaway occurs in a battery cell, the gas ejected from the battery cell cannot be quickly discharged, posing a safety hazard. And in order to prevent the busbar from contacting the outer shell of the battery cell, the busbar is usually insulated, resulting in a very high cost of the battery cell module. Summary of the Invention

[0005] The purpose of the present invention is to provide a battery cell module and a battery system that can solve the problem of inaccurate positioning of battery cells.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A battery cell module includes a plurality of battery cell unit components. The battery cell unit component includes a battery cell, an end cover, and a base. One end of the battery cell is connected to the end cover, and the other end of the battery cell is connected to the base; the end covers of adjacent battery cell unit components are detachably connected, and the bases of adjacent battery cell unit components are detachably connected.

[0008] As an optional solution of the above battery cell module, clamping portions are provided on both the end cover and the base. The end covers of two adjacent battery cell unit components are clamped through the clamping portions, and the bases of two adjacent battery cell unit components are clamped through the clamping portions.

[0009] As an optional solution of the above battery cell module, both the end cover and the base are in a prismatic structure, and the clamping portions are provided on each side wall of the end cover and the base.

[0010] As an optional solution of the above battery cell module, both the end cover and the base include:

[0011] A bottom plate, and the bottom plate is a regular polygon plate;

[0012] A plurality of side plates, each side edge of the bottom plate is connected to the side plates, and the clamping portions are provided on the side plates.

[0013] As an alternative embodiment of the above battery cell module, the number of the side plates is an even number. Among two relatively arranged side plates, the clamping portion on one side plate is a clamping block, and the clamping portion on the other side plate is a clamping groove.

[0014] As an alternative embodiment of the above battery cell module, the width of the clamping groove gradually increases towards the inner side of the side plate along the radial direction of the battery cell, and the shape of the clamping block is adapted to the shape of the clamping groove.

[0015] As an alternative embodiment of the above battery cell module, both the end cap and the base are regular hexagonal prism structures.

[0016] As an alternative embodiment of the above battery cell module, the battery cell is cylindrical;

[0017] Both the end cap and the base are provided with installation grooves, the end portions of the battery cells are arranged in the installation grooves, the side of the installation groove facing the battery cell is an arc surface adapted to the outer side wall of the battery cell, and the side of the installation groove facing away from the battery cell is a plane.

[0018] As an alternative embodiment of the above battery cell module, both the end cap and the base are prism structures, a notch is provided in the middle of the side wall of the prism structure, and the opening direction of the notch is the same as the opening direction of the installation groove.

[0019] As an alternative embodiment of the above battery cell module, the end cap is sleeved on one end of the battery cell, a first through hole is provided at the end portion of the end cap, and the electrode post of the battery cell extends out of the end cap through the first through hole to be connected to the bus bar.

[0020] As an alternative embodiment of the above battery cell module, the end cap is made of insulating material and supports the bus bar.

[0021] As an alternative embodiment of the above battery cell module, the end cap includes an end cap bottom plate, the first through hole is provided on the end cap bottom plate, a flange is convexly provided on the end cap bottom plate around the first through hole, and the flange is used to support the bus bar.

[0022] As an alternative embodiment of the above battery cell module, positioning posts adapted to the bus bar are provided on the flange.

[0023] As an alternative embodiment of the above battery cell module, the base includes a connected installation groove and a pressure relief cavity, the other end of the battery cell is arranged in the installation groove, and the pressure relief cavity is provided with a pressure relief hole.

[0024] As an alternative solution to the above battery cell module, the base includes:

[0025] A base bottom plate, in which the pressure relief cavity is arranged. The surface of the base bottom plate in contact with the battery cell is the top surface of the base bottom plate, and a second through hole communicating with the pressure relief cavity is arranged on the top surface of the base bottom plate:

[0026] A plurality of side plates, connected to the base bottom plate and arranged around the circumference of the base bottom plate. The plurality of side plates and the top surface of the base bottom plate enclose the installation groove, and two opposite side plates of adjacent two bases are clamped.

[0027] As an alternative solution to the above battery cell module, the pressure relief hole is arranged on the side wall of the base bottom plate.

[0028] As an alternative solution to the above battery cell module, the base bottom plate includes:

[0029] An upper layer plate for supporting the battery cell, and the second through hole is arranged on the upper layer plate;

[0030] A lower layer plate, arranged at an interval from the upper layer plate, and the pressure relief cavity is formed between the upper layer plate and the lower layer plate;

[0031] A plurality of strengthening blocks, arranged between the upper layer plate and the lower layer plate and spaced along the circumference of the second through hole, and the pressure relief holes are formed between adjacent two strengthening blocks.

[0032] As an alternative solution to the above battery cell module, the height of the pressure relief cavity is 5 - 20 mm.

[0033] As an alternative solution to the above battery cell module, both ends of the battery cell are adhesively fixed to the end cover and the base respectively.

[0034] As an alternative solution to the above battery cell module, an adhesive application groove is arranged in the installation groove.

[0035] As an alternative solution to the above battery cell module, the adhesive application groove is arranged on the bottom surface of the installation groove and close to the inner side wall of the installation groove.

[0036] As an alternative solution to the above battery cell module, strengthening blocks are arranged in the pressure relief cavity, the strengthening blocks are respectively connected to the top surface and the bottom surface of the pressure relief cavity, and the adhesive application groove extends into the strengthening blocks.

[0037] As an alternative solution to the above battery cell module, the width of the adhesive application groove gradually increases from the radial direction of the battery cell to the outside of the installation groove.

[0038] As an alternative solution to the above cell module, at least two adjacent end caps are detachably connected to enclose a glue injection hole.

[0039] As an alternative solution to the above cell module, the cell module further includes a foaming glue layer and a structural glue layer arranged in a stacked manner, and both the foaming glue layer and the structural glue layer are sleeved outside the cell.

[0040] A battery system includes the above cell module.

[0041] Advantages of the present invention:

[0042] In the cell module provided by the present invention, each cell is provided with an end cap and a base. The adjacent end caps and adjacent bases are detachably connected to group multiple cells, which makes the assembly of the cell module convenient, is conducive to improving the relative position accuracy between cells, and thus improves the assembly accuracy of the cell module. After the cells are grouped, since the adjacent bases are connected as a whole and the adjacent end caps are connected as a whole, and the end caps and bases are respectively arranged at both ends of the cell, it is conducive to improving the structural strength and reliability of the cell module.

[0043] Both the base and the end cap are sleeved outside the cell, which can limit the extending direction of the cell, is conducive to improving the positioning accuracy of the cell, and ensures that multiple grouped cells are parallel;

[0044] The end cap is supported by an insulating material, which can separate the bus bar from the outer shell of the cell, and there is no need to insulate the bus bar, which is conducive to reducing costs.

[0045] The pressure relief cavity is communicated with the installation groove, which can enable the gas generated by the cell to enter the pressure relief cavity during thermal runaway of the cell and be discharged through the pressure relief hole, avoiding the combustion or explosion of the cell.

[0046] The battery system provided by the present invention uses the above cell module, which has high processing accuracy and reliable structure. Description of the drawings

[0047] Figure 1 is a partial structural schematic diagram of the cell module provided in Embodiment 1 of the present invention;

[0048] Figure 2 is a structural schematic diagram of the cell, end cap and base before assembly in Embodiment 1 provided by the present invention;

[0049] Figure 3 is a top view of two cells detachably connected by an end cap in Embodiment 1 provided by the present invention;

[0050] Figure 4 is a structural schematic diagram of the cell module provided in Embodiment 1 of the present invention;

[0051] Figure 5 It is a schematic structural diagram of the battery cell module provided in the first embodiment of the present invention when not assembled;

[0052] Figure 6 is Figure 1 a partial enlarged view of part A in

[0053] Figure 7 It is a schematic structural diagram of two battery cells detachably connected through an end cover and a base provided in the second embodiment of the present invention;

[0054] Figure 8 It is a schematic structural diagram of the base provided in the third embodiment of the present invention;

[0055] Figure 9 It is a top view of the base provided in the third embodiment of the present invention.

[0056] In the figure:

[0057] 1. Battery cell; 11. Electrode post; 2. End cover; 20. Bottom plate; 21. End cover bottom plate; 211. First through hole; 22. Side plate; 221. Clamping block; 222. Card slot; 223. Groove; 224. Glue injection hole; 225. Notch; 23. Flange; 231. Positioning post; 3. Base; 31. Base bottom plate; 311. Upper layer plate; 3111. Second through hole; 3112. Glue application groove; 312. Lower layer plate; 313. Reinforcing block; 314. Pressure relief hole; 4. Module upper cover; 5. Integrated component; 51. Bus bar; 6. Foam glue layer; 7. Structural glue layer. Specific embodiments

[0058] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0059] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; 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 or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0060] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0061] In the description of this embodiment, the orientation or positional relationships such as "up", "down", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, 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 should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0062] Embodiment 1

[0063] As Figure 1 and Figure 2 shown, this embodiment provides a battery system, including a battery cell module. The battery cell module includes a plurality of battery cell components. Each battery cell component includes a battery cell 1, an end cover 2 and a base 3. One end of each battery cell 1 is provided with an end cover 2, and the other end is provided with a base 3. The end covers 2 of adjacent two battery cell components are detachably connected, and the bases 3 of adjacent two battery cell components are detachably connected, so that a plurality of battery cells 1 are relatively fixed in a group. When assembling the battery cell module, first, the two ends of the battery cell 1 are respectively connected to the corresponding end cover 2 and base 3, and then through the detachable connection between the end covers 2 and the detachable connection between the bases 3, a plurality of battery cells 1 can be relatively fixed in a group.

[0064] Compared with the assembling method of the battery cell module in the prior art, in the assembling process of the battery cell module in this embodiment, there is no need to use a positioning tooling. Each battery cell 1 is correspondingly provided with an end cover 2 and a base 3, making it more convenient for a plurality of battery cells 1 to form a group; and the adjacent end covers 2 are connected in a group, and the adjacent bases 3 are connected in a group, which is beneficial to improving the relative position accuracy between the battery cells 1, thereby improving the assembling accuracy of the battery cell module and can adaptively adjust the number of assembled battery cells according to the capacity of the specific battery cell module and the size and shape of the box body, and the grouping method is more flexible. After the battery cells 1 are grouped, a plurality of end covers 2 are connected to form an upper shelf body, and a plurality of bases 3 are connected to form a lower shelf body, which is beneficial to improving the structural strength and reliability of the battery cell module.

[0065] In this embodiment, clamping portions are provided on both the end cap 2 and the base 3. Two adjacent end caps 2 are clamped together through the clamping portions to facilitate disassembly and assembly; two adjacent bases 3 are clamped together through the clamping portions to facilitate disassembly and assembly.

[0066] In this embodiment, the end cap 2 is arranged at one axial end of the battery cell 1, and the base 3 is arranged at the other axial end of the battery cell 1, so that the end cap 2 and the base 3 respectively exert binding forces on the battery cell 1 from both axial ends of the battery cell 1, which is beneficial to improving the positioning accuracy of the battery cell 1.

[0067] Furthermore, both the end cap 2 and the base 3 are sleeved outside the battery cell 1, so that the structure is compact after the end cap 2, the base 3 and the battery cell 1 are assembled, which is beneficial to reducing the overall size of the battery cell module.

[0068] Specifically, mounting grooves are provided on both the base 3 and the end cap 2, and the end portions of the battery cell 1 are mounted in the mounting grooves. Through the cooperation between the battery cell 1 and the mounting grooves, the extending direction of the battery cell 1 can be restricted by the side walls of the mounting grooves, which is beneficial to ensuring that multiple battery cells 1 are arranged in parallel after the battery cells 1 are grouped, thereby further improving the positioning accuracy of the battery cell 1.

[0069] To improve the positioning effect of the mounting grooves on the battery cell 1, the mounting grooves need to have a certain cooperation depth with the battery cell 1. Optionally, the depth of the mounting grooves is 5 - 20 mm, such as 10 mm, 12 mm, 15 mm or 18 mm.

[0070] Optionally, both ends of the battery cell 1 are adhesively fixed in the mounting grooves of the base 3 and the mounting grooves of the end cap 2 respectively, so as to simplify the structures of the base 3 and the end cap 2. On the basis of satisfying the fixation of the battery cell 1 with the base 3 and the end cap 2, the structure of the battery cell 1 is not damaged, and the size after fixation is small.

[0071] Furthermore, as shown in Figure 2 and Figure 3 , the base 3 and the end cap 2 are of a prismatic structure, so that both the base 3 and the end cap 2 have an axial end face and a plurality of side walls, and clamping portions are provided on each side wall of the base 3 and the end cap 2. With the above arrangement, a plurality of end caps 2 can be arranged in the circumferential direction of each end cap 2, and the two opposite side walls of two adjacent end caps 2 can be clamped and fixed, so as to increase the number of end caps 2 that a single end cap 2 can connect, making the structure more compact after multiple end caps 2 are spliced. Similarly, a plurality of bases 3 can be arranged in the circumferential direction of each base 3, and the two opposite side walls of two adjacent bases 3 can be clamped and fixed, so as to increase the number of bases 3 that a single base 3 can connect, making the structure more compact after multiple bases 3 are spliced.

[0072] Specifically, the base 3 and the end cover 2 each include a bottom plate and a plurality of side plates 22. The specific structure is described below using the end cover 2 as an example, and the bottom plate in the end cover 2 is defined as the end cover bottom plate 21. The end cover bottom plate 21 is a polygonal plate, and each side of the end cover bottom plate 21 is connected to a side plate 22. The end cover bottom plate 21 and the plurality of side plates 22 form a mounting groove, and a clamping portion is provided on the side plate 22. It can be understood that, on the basis that the radial dimension of the end cover 2 along the battery cell 1 remains unchanged, the area of the end cover bottom plate 21 when it is polygonal is smaller than the area of the circle, thereby saving space and the materials required for processing the end cover 2, which is conducive to reducing costs.

[0073] To facilitate the assembly of multiple end caps 2, the end cap base plate 21 is a rectangular plate or a regular hexagonal plate. Rectangular plates and regular hexagonal plates can be assembled to form a relatively complete rectangular area. The assembled area has a standard shape, which facilitates the planning of the installation location of the battery cell module in the battery system and helps improve space utilization.

[0074] In this embodiment, the engaging portion of the two opposing side panels 22 of two adjacent end caps 2 is a block 221 on one side panel, and a slot 222 on the other side panel. The block 221 engages within the slot 222 to secure the two adjacent end caps 2. The block 221 and slot 222 are shaped and sized to match, so that when the block 221 engages within the slot 222, the outer contours of the two opposing side panels 22 coincide, minimizing the joint gap and achieving a more compact joint.

[0075] Optionally, the slot 222 extends through both ends of the side plate 22 along the axial direction of the battery cell 1, so that the slot 222 is a through slot. This arrangement allows the clamping block 221 to move in both the forward and reverse directions along the axial direction of the end cap 2 to engage or disengage with the slot 222, making installation more convenient.

[0076] Furthermore, by configuring the slot 222 as a through slot, dimensional errors between the block 221 and the slot 222 can be accommodated. For example, when the block 221 is larger than the slot 222 along the axial direction of the battery cell 1, the axial end faces of adjacent end caps 2 or the axial end faces of the battery cells 1 can be aligned by adjusting the axial position of the block 221 and the slot 222, thereby ensuring the relative position accuracy of the grouped battery cells 1.

[0077] In this embodiment, the width of the slot 222 gradually increases radially toward the inside of the mounting slot along the battery cell 1, and the shape of the clamping block 221 is adapted to the shape of the slot 222, so that after the clamping block 221 is matched with the slot 222, the inner wall of the slot 222 can prevent the clamping block 221 from escaping from the slot 222 radially outward along the battery cell 1, which is beneficial to improving the clamping effect between the clamping block 221 and the slot 222.

[0078] Exemplarily, the clamping groove 222 is a trapezoidal groove, and the cross-sectional shape of the clamping block 221 along the radial direction of the battery core 1 is a trapezoid.

[0079] Further, among the two opposite side plates 22 in the end cap 2, a clamping block 221 is provided on one side plate 22, and a clamping groove 222 is provided on the other side plate 22. This structure makes the structures of multiple end caps 2 the same, that is, only one type of end cap 2 needs to be manufactured in the battery cell module, which is beneficial to reducing the processing cost and facilitating splicing.

[0080] In this embodiment, clamping blocks 221 are provided on three adjacent side plates 22 in the end cap 2, and clamping grooves 222 are provided on the other three adjacent side plates 22.

[0081] Since the battery cell 1 is cylindrical, in order to improve the fixing and positioning effects of the installation groove on the battery cell 1, the side of the side plate 22 facing the battery cell 1 is an arc surface adapted to the outer side wall of the battery cell 1, that is, the installation groove is a cylindrical groove. In order to facilitate the processing of the clamping block 221 and the clamping groove 222 on the side plate 22, the side of the side plate 22 facing away from the battery cell 1 is a plane, so as to reduce the processing difficulty and is beneficial to improving the processing accuracy of the clamping block 221 and the clamping groove 222. And the outer side surface of the side plate 22 being a plane is also beneficial to improving the clamping accuracy of the two opposite side plates 22, making the structure more compact after the adjacent two end caps 2 are connected.

[0082] The side of the side plate 22 facing away from the battery cell 1 is a plane, and the side facing the battery cell 1 is an arc surface, making the thickness of the side plate 22 uneven. Specifically, the thickness is large at the connection position of the two side plates 22, and the thickness is small at the middle position of the side plate 22. To reduce the size and processing cost of the battery cell module after splicing, the distance between the side plate 22 and the axis of the battery cell 1 is designed to be as small as possible, resulting in a thinner middle part of the side plate 22, making it difficult to process the middle part of the side plate 22, and having poor strength, being prone to deformation or fracture.

[0083] To solve the above problems, as Figure 2 shown, in this embodiment, a notch 225 is provided in the middle of the side plate 22. Among them, the opening of the notch 225 on the end cap 2 faces the base 3, and the opening of the notch 225 on the base 3 faces the end cap 2. By providing the notch 225, the thinner part of the side plate 22 can be removed, and the part with thicker thickness and better strength in the side plate 22 can be retained, thereby reducing the processing difficulty of the end cap 2, improving the strength of the end cap 2, and saving materials, which is beneficial to reducing costs.

[0084] In this embodiment, the notch 225 extends to the end cap bottom plate 21, so that each side plate 22 includes two spaced extension arms, and the extension arms in the adjacent two side plates 22 are connected and located at the corner of the end cap bottom plate 21.

[0085] It can be understood that the base 3 also includes a bottom plate and a plurality of side plates 22. The bottom plate in the base 3 is defined as the base bottom plate 31. For the shape, structure, and connection relationship of the base bottom plate 31 and the side plates 22, reference can be made to the end cover 2, which will not be elaborated in this embodiment.

[0086] In this embodiment, both the end cover 2 and the base 3 are integrally formed structures, which is convenient for processing and reduces costs.

[0087] In this embodiment, as Figure 4 and Figure 5 shown, the battery cell module further includes a foaming glue layer 6 and a structural glue layer 7. The foaming glue layer 6 and the structural glue layer 7 are both arranged between the upper frame body and the lower frame body, filling the gaps between adjacent battery cells 1 to make the positions of the battery cells 1 more stable. The foaming glue layer 6 and the structural glue layer 7 can play a buffering role, reducing the influence of vibration and shock on the battery cells 1, the base 3, and the end cover 2, which is beneficial to improving the structural stability of the battery cell module.

[0088] To facilitate the formation of the foaming glue layer 6 and the structural glue layer 7, as Figure 6 shown, the adjacent end covers 2 are spliced to form a glue injection hole 224, and the glue injection hole 224 is used to inject glue into the gaps between adjacent battery cells 1.

[0089] Combined with Figure 3 and Figure 6 shown, in this embodiment, the end cover 2 is a regular hexagonal prism type. When three adjacent end covers 2 are spliced, a glue injection hole 224 is formed, and the glue injection hole 224 is a through hole extending along the axial direction of the battery cell 1. To facilitate the formation of the glue injection hole 224, an arc groove 223 is provided at the connection of two adjacent side plates 22 in the end cover 2, and the central angle of the arc groove 223 is 120°.

[0090] Optionally, the thickness of the foaming glue layer 6 and the structural glue layer 7 is 5 - 30 mm, such as 10 mm, 15 mm, 20 mm, or 25 mm, to better fix the battery cells 1 and play a buffering role.

[0091] Furthermore, the battery cell module further includes a module upper cover 4 and an integrated component 5. The integrated component 5 is arranged on the upper frame body, and the module upper cover 4 is arranged on the integrated component 5. The integrated component 5 includes a busbar 51 for connecting multiple battery cells 1 in series and parallel; the module upper cover 4 plays an insulating role to prevent the integrated component 5 from coming into contact with external metals and causing a short circuit.

[0092] Optionally, combined with Figure 2 and Figure 3 shown, a first through hole 211 is provided on the end cover bottom plate 21 of the end cover 2, and an electrode post 11 is provided at one end of the battery cell 1 that cooperates with the end cover 2. The electrode post 11 extends out of the end cover 2 through the first through hole 211 to facilitate connection with the busbar 51, so that multiple battery cells 1 can be connected in series or parallel through the busbar 51.

[0093] Since a first through hole 211 is provided on the end cap bottom plate 21 of the end cap 2, and the first through hole 211 cooperates with the electrode post 11, if the glue overflows and covers the outer wall of the end cap bottom plate 21 or the electrode post 11 during the bonding process, it will affect the conduction effect between the electrode post 11 and the bus bar 51. Therefore, a glue removal process needs to be added after the bonding process, which not only increases the processing procedures and costs, but also easily damages the battery cell 1 during the glue removal process.

[0094] To avoid the above problems, in this embodiment, the end cap 2 is adhesively fixed to the battery cell 1 through the side plate 22. On the one hand, it can increase the distance between the glue application position and the end cap bottom plate 21, avoiding the glue overflowing and covering the end cap bottom plate 21 or the electrode post 11. On the other hand, the glue application position is set on the side plate 22, and the glue application operation can be carried out by using the opening and notch 225 of the installation groove, making the operation more convenient.

[0095] To improve the fixing effect between the end cap 2 and the battery cell 1, the bonding area between the side plate 22 of the end cap 2 and the battery cell 1 is 50%-80% of the contact area between the side plate 22 of the end cap 2 and the battery cell 1, such as 55%, 60%, 65%, 70% or 75%.

[0096] Furthermore, to facilitate one end of the battery cell 1 to extend into the installation groove, the installation groove and the battery cell 1 are in clearance fit, which is convenient for the assembly of the battery cell 1 and the end cap 2.

[0097] To ensure a certain contact pressure between the side plate 22 and the battery cell 1 and thus improve the bonding effect, optionally, the clearance between the installation groove and the battery cell 1 is 1-2 mm, such as 1.2 mm, 1.4 mm, 1.6 mm or 1.8 mm.

[0098] Embodiment Two

[0099] To ensure the normal operation of the battery cell module, the bus bar 51 needs to be insulated from the outer shell of the battery cell 1. In the prior art, the insulation between the bus bar 51 and the outer shell of the battery cell 1 is generally achieved by insulating the bus bar 51, which greatly increases the cost of the battery cell module.

[0100] To solve the above problems, as Figure 7 shown, this embodiment provides a battery system, which is further improved on the basis of Embodiment One. Specifically, the end cap 2 is made of an insulating material, which can separate the outer shell of the battery cell 1 from the bus bar 51, which is beneficial to improving the reliability of the battery cell module.

[0101] Optionally, the end cap 2 can be made of a plastic material, which has a low cost and a light weight. Optionally, the end cap 2 is integrally formed by an injection molding process to simplify the processing steps.

[0102] The bus bar 51 in this embodiment does not need to be insulated, which is beneficial to reducing the processing cost. The end cap 2 separates the bus bar 51 from the outer shell of the battery cell 1, and the insulation effect between the bus bar 51 and the outer shell of the battery cell 1 is good.

[0103] Further, a flange 23 is provided on the end cap bottom plate 21 around the first through hole 211. The flange 23 is used to support the bus bar 51, which can further increase the distance between the bus bar 51 and the outer shell of the battery cell 1, so as to make the insulation effect between the bus bar 51 and the outer shell of the battery cell 1 better.

[0104] Optionally, positioning posts 231 cooperating with the bus bar 51 are provided on the end cap bottom plate 21 or the flange 23, and positioning holes are provided on the bus bar 51. When installing the bus bar 51, the positioning posts 231 extend into the positioning holes, so as to limit the position of the bus bar 51 through the cooperation of the positioning posts 231 and the positioning holes, improve the positioning effect of the bus bar 51, and prevent the bus bar 51 from detaching from the electrode post 11 or contacting the outer shell of the battery cell 1 due to external force displacement. The connection between the positioning post and the positioning hole can be a snap connection or a riveting connection.

[0105] In addition, after the battery cell 1 and the end cap 2 are assembled, the end face of the battery cell 1 abuts against the flange 23, so that the flange 23 can play a positioning role on the battery cell 1, which is convenient for the adhesive bonding between the side plate 22 and the side face of the battery cell 1.

[0106] Embodiment Three

[0107] During the operation of the battery cell 1, heat will be generated. If the temperature of the battery cell 1 is too high and thermal runaway occurs, high-pressure gas will be generated inside it. If the gas cannot be discharged quickly, as the gas pressure increases, there is a risk of explosion of the battery cell 1.

[0108] To ensure the safe use of the battery cell module, this embodiment provides a battery system, which is further improved on the basis of Embodiment One or Embodiment Two. Specifically, as shown in Figure 8 and Figure 9 , the base plate 31 in the base 3 is different from the end cap bottom plate 21 in the end cap 2, so that the base 3 includes a connected installation groove and a pressure relief cavity. The other end of the battery cell 1 is arranged in the installation groove and abuts against the bottom of the installation groove. The pressure relief cavity is provided with a pressure relief hole 314.

[0109] When the battery cell 1 has a thermal runaway, the explosion-proof valve at the bottom of the battery cell 1 bursts, so that the gas and ejecta generated inside the battery cell 1 enter the pressure relief cavity from the installation groove and are discharged through the pressure relief hole 314, achieving the purpose of not catching fire or exploding under the thermal runaway of the battery cell 1, thereby ensuring the safe use of the battery cell module and greatly reducing the impact on other battery cells 1.

[0110] To ensure the pressure relief effect of the pressure relief chamber and enable the explosion-proof valve at the bottom of the battery cell 1 to open effectively, the pressure relief chamber needs to have a certain space. Optionally, the height of the pressure relief chamber is 5-20 mm, such as 10 mm, 12 mm, 15 mm or 18 mm. When the height of the pressure relief chamber is within this range, the pressure relief effect is good.

[0111] The base plate 31 of the base 3 has a double-layer structure, and a pressure relief chamber is constructed therein. A second through hole 3111 communicating with the pressure relief chamber is provided on the top surface of the base plate 31. The second through hole 3111 communicates the installation groove with the pressure relief chamber. When the battery cell 1 is inserted into the installation groove, the explosion-proof valve at the bottom of the battery cell 1 is opposite to the second through hole 3111. When the battery cell 1 has a thermal runaway, the second through hole 3111 provides a blasting space for the explosion-proof valve, and the gas and ejecta generated inside the battery cell 1 enter the pressure relief chamber through the second through hole 3111 and are then discharged through the pressure relief hole 314.

[0112] Optionally, the pressure relief hole 314 is provided on the side surface of the base plate 31 so that the gas is discharged along the radial direction of the battery cell 1, avoiding the gas flowing upward and contacting the battery cell 1, which is beneficial to improving the safety performance of the battery cell module.

[0113] To improve the fixing effect between the battery cell 1 and the base 3, a glue application groove 3112 is provided in the installation groove. The glue application groove 3112 is used to accommodate glue to ensure that there is enough glue for bonding and improve the bonding strength.

[0114] Optionally, for the convenience of applying glue, the glue application groove 3112 is provided on the bottom surface of the installation groove. Compared with applying glue on the side wall of the installation groove, it can avoid the glue flowing around under the action of gravity to prevent the glue from adhering to other positions of the base 3 and the battery cell 1.

[0115] Furthermore, the glue application groove 3112 is provided close to the side wall of the installation groove, that is, the glue application groove 3112 is provided at the edge of the base plate 31 to prevent the glue from blocking the second through hole 3111 and affecting the pressure relief.

[0116] In this embodiment, a plurality of glue application grooves 3112 are provided and arranged at intervals along the circumference of the base plate 31. By providing a plurality of glue application grooves 3112, the battery cell 1 and the base 3 have a plurality of bonding positions, and the plurality of bonding positions are close to the radial edge of the battery cell 1, which is beneficial to improving the fixing strength.

[0117] The base bottom plate 31 includes an upper layer plate 311, a lower layer plate 312, and a plurality of reinforcing blocks 313. The upper layer plate 311 and the lower layer plate 312 are arranged at intervals to form a pressure relief cavity, and the second through hole 3111 is provided on the upper layer plate 311. The reinforcing blocks 313 are arranged between the upper layer plate 311 and the lower layer plate 312 and are respectively connected to the upper layer plate 311 and the lower layer plate 312, so that the base bottom plate 31 forms an integral body. When the battery cell 1 is fixed to the base 3, the upper layer plate 311 supports the other end face of the battery cell 1, and the glue application groove 3112 is provided on the upper layer plate 311, so that the battery cell 1 is adhesively fixed to the upper layer plate 311. In this embodiment, the pressure relief cavity includes a cylindrical cavity below the second through hole 3111 and the cavities between adjacent two reinforcing blocks 313.

[0118] To ensure that the glue application groove 3112 has a certain depth to accommodate more glue, the reinforcing block 313 is located below the glue application groove 3112, and the glue application groove 3112 extends downward into the reinforcing block 313 to ensure that the glue application groove 3112 has sufficient depth.

[0119] In addition, arranging the reinforcing block 313 below the glue application groove 3112 is also beneficial to improving the strength of the base bottom plate 31 to ensure that the base bottom plate 31 has sufficient ability to support the battery cell 1.

[0120] In this embodiment, the plurality of reinforcing blocks 313 are arranged at intervals along the circumferential direction of the second through hole 3111, and a pressure relief hole 314 is formed between adjacent two reinforcing blocks 313 to communicate the pressure relief cavity with the outside.

[0121] To improve the fixing effect between the base 3 and the battery cell 1, the bonding area between the base bottom plate 31 and the battery cell 1 is 50%-80% of the contact area between the base bottom plate 31 and the battery cell 1, such as 60%, 65%, 70% or 75%.

[0122] Furthermore, to facilitate the end of the battery cell 1 to extend into the installation groove, the installation groove and the battery cell 1 are in clearance fit to facilitate the assembly of the battery cell 1 and the base 3.

[0123] To ensure that there is a certain contact pressure between the side plate 22 and the battery cell 1 and thus improve the bonding effect, optionally, the clearance between the installation groove and the battery cell 1 is 1-2 mm, such as 1.2 mm, 1.4 mm, !.5 mm, 1.7 mm or 1.9 mm.

[0124] Optionally, the glue application groove 3112 extends to the side plate 22, so that after the battery cell 1 is placed in the installation groove, the battery cell 1 can extrude the excess glue towards the side plate 22, increasing the bonding area between the battery cell 1 and the base 3 to improve the bonding effect.

[0125] Optionally, the width of the sizing groove 3112 gradually increases radially outward of the mounting groove along the second through hole 3111. Such a setting makes the glue amount near the position of the second through hole 3111 less and the glue amount near the side plate 22 more, so as to avoid the through hole being blocked after the glue overflows. Compared with the case where the width of the sizing groove 3112 remains unchanged, the above setting can increase the glue application amount to improve the bonding and fixing effect.

[0126] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery cell module, characterized in that, It includes a plurality of battery cell unit components, and each battery cell unit component includes a battery cell (1), an end cap (2) and a base (3). One end of the battery cell (1) is connected to the end cap (2), and the other end of the battery cell (1) is connected to the base (3); the end caps (2) of adjacent battery cell unit components are detachably connected, and the bases (3) of adjacent battery cell unit components are detachably connected; at least two adjacent end caps (2) are detachably connected to form a glue injection hole (224) after connection. The base (3) includes a connected installation groove and a pressure relief cavity. The other end of the battery cell (1) is arranged in the installation groove, and the pressure relief cavity is provided with a pressure relief hole (314). The base (3) includes: A base bottom plate (31). The pressure relief cavity is arranged in the base bottom plate (31). The surface of the base bottom plate (31) in contact with the battery cell (1) is the top surface of the base bottom plate. The top surface of the base bottom plate is provided with a second through hole (3111) communicated with the pressure relief cavity. When the battery cell (1) is inserted into the installation groove, the explosion-proof valve at the bottom of the battery cell (1) is opposite to the second through hole (3111). The base bottom plate (31) includes: An upper layer plate (311) for supporting the battery cell (1). The second through hole (3111) is arranged on the upper layer plate (311). A lower layer plate (312) spaced from the upper layer plate (311). The pressure relief cavity is formed between the upper layer plate (311) and the lower layer plate (312). A plurality of strengthening blocks (313) are arranged between the upper layer plate (311) and the lower layer plate (312) and are arranged at intervals along the circumference of the second through hole (3111). The pressure relief holes (314) are formed between adjacent two of the strengthening blocks (313).

2. The battery cell module according to claim 1, characterized in that Both the end cap (2) and the base (3) are provided with clamping parts. Two adjacent end caps (2) are clamped through the clamping parts, and two adjacent bases (3) are clamped through the clamping parts.

3. The battery cell module according to claim 2, characterized in that, Both the end cap (2) and the base (3) are of a prismatic structure, and the clamping parts are arranged on each side wall of the end cap (2) and the base (3).

4. The battery cell module according to claim 3, characterized in that, Both the end cap (2) and the base (3) include: A bottom plate which is a regular polygon plate. A plurality of side plates (22). Each side edge of the bottom plate is connected with the side plate (22), and the clamping parts are arranged on the side plate (22).

5. The cell module according to claim 4, wherein The number of the side plates (22) is even. Among two relatively arranged side plates (22), the clamping part on one side plate (22) is a clamping block (221), and the clamping part on the other side plate (22) is a clamping groove (222).

6. The cell module according to claim 5, characterized in that The width of the clamping groove (222) gradually increases towards the inner side of the side plate along the radial direction of the battery cell (1), and the shape of the clamping block (221) is adapted to the shape of the clamping groove (222).

7. The cell module according to claim 3, characterized in that, Both the end cap (2) and the base (3) are of a regular hexagonal prism structure.

8. The battery cell module according to any one of claims 1-7, characterized in that, The battery cell (1) is cylindrical. Both the end cap (2) and the base (3) are provided with mounting grooves, and the ends of the battery cell (1) are arranged in the mounting grooves. The side of the mounting groove facing the battery cell (1) is an arc surface adapted to the outer side wall of the battery cell (1), and the side of the mounting groove facing away from the battery cell (1) is a flat surface.

9. The battery cell module according to claim 8, wherein, Both the end cap (2) and the base (3) are of a prismatic structure, and a notch (225) is provided in the middle of the side wall of the prismatic structure. The opening direction of the notch (225) is the same as the opening direction of the mounting groove.

10. The battery cell module according to any one of claims 1-7, characterized in that, The end cap (2) is sleeved on one end of the battery cell (1), and a first through hole (211) is provided at the end of the end cap (2). The electrode post (11) of the battery cell (1) extends out of the end cap (2) through the first through hole (211) to be connected with a bus bar (51).

11. The battery cell module according to claim 10, wherein The end cap (2) is made of an insulating material and supports the bus bar (51).

12. The battery cell module according to claim 10, characterized in that, The end cap (2) includes an end cap bottom plate (21). The first through hole (211) is provided on the end cap bottom plate (21). A flange (23) is convexly provided on the end cap bottom plate (21) around the first through hole (211). The flange (23) is used to support the bus bar (51).

13. The cell module according to claim 12, wherein Positioning posts (231) matching with the bus bar (51) are provided on the flange (23).

14. The battery cell module according to claim 1, wherein, The base (3) further includes: A plurality of side plates (22), which are connected to the base bottom plate (31) and arranged around the circumference of the base bottom plate (31). The plurality of side plates (22) and the top surface of the base bottom plate (31) enclose the mounting groove, and the opposite two side plates (22) of adjacent two bases (3) are snap-connected.

15. The battery cell module according to claim 14, wherein The pressure relief hole (314) is provided on the side wall of the base bottom plate (31).

16. The cell module according to claim 1, wherein The height of the pressure relief cavity is 5 - 20 mm.

17. The battery cell module according to claim 1, characterized in that, Both ends of the battery cell (1) are adhesively fixed to the end cap (2) and the base (3) respectively.

18. The battery cell module according to claim 17, wherein A glue application groove (3112) is provided in the mounting groove.

19. The battery cell module according to claim 18, wherein The glue application groove (3112) is provided on the groove bottom surface of the mounting groove and close to the inner side wall of the mounting groove.

20. The battery cell module according to claim 19, wherein, A reinforcing block (313) is provided in the pressure relief cavity. The reinforcing block (313) is connected to the top surface and the bottom surface of the pressure relief cavity respectively. The glue application groove (3112) extends into the reinforcing block (313).

21. The battery cell module according to claim 19, wherein, The width of the glue application groove (3112) gradually increases from the radial direction of the battery cell (1) to the outside of the mounting groove.

22. The battery cell module according to any one of claims 1-7, characterized in that, The battery cell module further includes a foam adhesive layer (6) and a structural adhesive layer (7) which are stacked. Both the foam adhesive layer (6) and the structural adhesive layer (7) are sleeved outside the battery cell (1).

23. A battery system, characterized in that, Including the battery cell module according to any one of claims 1 - 22.

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