Lithium battery module

Abstract

A lithium battery module includes a shell, a plurality of single batteries and a busbar, the busbar includes a plurality of conductive modules and a plurality of connection switches. The plurality of conductive modules are correspondingly arranged on the plurality of single batteries, each conductive module includes a carrier plate, a tab patch, a parallel contact and a series contact which are arranged on the carrier plate, the tab patch is electrically connected with the tab of the single battery, the parallel contacts of two adjacent conductive modules are in contact, and the series contacts of two adjacent conductive modules are in contact; one connection switch is arranged between each two adjacent conductive modules, each connection switch includes an insulating tab, a parallel patch and a series patch, only by pushing the insulating tab, the connection state of two adjacent single batteries can be switched, so that the two adjacent single batteries can be flexibly switched between series connection and parallel connection, the assembly fault tolerance is improved, the busbar does not need to be selected, and the assembly difficulty of the lithium battery module is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a battery, in particular to a lithium battery module. BACKGROUND

[0002] The operating power of different electrical appliances is different. When the batteries are connected in series, the output current is constant, and the voltage is increased. When the batteries are connected in parallel, the output voltage is constant, and the capacity and output current are improved. Therefore, the developers form a battery module by connecting single batteries in series and parallel to meet the use requirements of various electrical appliances.

[0003] In the current battery module production process, after fixing multiple batteries, the tab of the adjacent battery is butt jointed by setting the bus bar, and the corresponding bus bar needs to be selected according to the connection relationship of the adjacent batteries for connection, that is, two different bus bars are used for series connection and parallel connection between the batteries, and the electrical connection mode between the two adjacent batteries in the battery module needs to be planned in advance, and the corresponding type of bus bar is selected for connection. In actual operation, the wrong bus bar is often installed, and rework is required, which has low fault tolerance and is not conducive to the automatic production of the battery module. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a lithium battery module with high assembly fault tolerance and flexible switching of the electrical connection mode between the internal single batteries.

[0005] The purpose of the present application is achieved by the following technical solutions:

[0006] A lithium battery module comprises a shell, a plurality of single batteries accommodated in the shell, and a bus bar for connecting each single battery, wherein the bus bar comprises a plurality of conductive modules and a plurality of connection switching pieces.

[0007] Each of the plurality of conductive modules is correspondingly arranged on each of the plurality of single batteries, and each conductive module comprises a carrier plate, a tab patch block, a parallel contact, and a series contact arranged on the carrier plate, the tab patch block is electrically connected to the tab of the single battery, the parallel contacts of two adjacent conductive modules are abutted, and the series contacts of two adjacent conductive modules are abutted.

[0008] Each of the plurality of conductive modules is correspondingly arranged on each of the plurality of single batteries, and each conductive module comprises a carrier plate, a tab patch block, a parallel contact, and a series contact arranged on the carrier plate, the tab patch block is electrically connected to the tab of the single battery, the parallel contacts of two adjacent conductive modules are abutted, and the series contacts of two adjacent conductive modules are abutted.

[0009] In one of the embodiments, the lug patch includes a positive lug patch and a negative lug patch, the positive lug of the single battery is electrically connected with the positive lug patch, and the negative lug of the single battery is electrically connected with the negative lug patch.

[0010] In one of the embodiments, the parallel contact includes two positive contact blocks and two negative contact blocks, the two positive contact blocks are arranged on the first end of the carrier plate, and the two negative contact blocks are arranged on the second end of the carrier plate.

[0011] In one of the embodiments, the parallel patch includes two positive conductive sheets and two negative conductive sheets, the two positive conductive sheets are arranged on the first end of the insulating tab, each of the positive conductive sheets is used to be in contact with one of the positive contact blocks, the two negative conductive sheets are arranged on the second end of the insulating tab, and each of the negative conductive sheets is used to be in contact with one of the negative contact blocks.

[0012] In one of the embodiments, the series contact is located between the positive lug patch and the negative lug patch.

[0013] In one of the embodiments, the series contact is provided with a connecting end, and the connecting end is used to be in contact with the series patch.

[0014] In one of the embodiments, the series contact is in a "cross" structure.

[0015] In one of the embodiments, the series patch includes an upper patch and a lower patch, and the upper patch and the lower patch are arranged on the insulating tab.

[0016] In one of the embodiments, the insulating tab is provided with anti-skid stripes.

[0017] In one of the embodiments, the busbar further includes a plurality of protective covers, and the plurality of protective covers are correspondingly arranged on the plurality of carrier plates.

[0018] Compared with the prior art, the present application has at least the following advantages:

[0019] 1. Only the insulating tab needs to be pushed to switch the connection state of the adjacent two single batteries, so that the adjacent two single batteries can be flexibly switched between the series connection and the parallel connection, and the assembly fault tolerance is improved.

[0020] 2. The conductive modules are the same in structure, and the busbar does not need to be selected, thereby reducing the assembly difficulty of the lithium battery module. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0022] Figure 1 Assembling schematic diagram of lithium battery module in an embodiment of the present application;

[0023] Figure 2 Exploded view of lithium battery module in an embodiment of the present application;

[0024] Figure 3 Schematic diagram of contact state of parallel patch and parallel contact on adjacent two conductive modules in an embodiment of the present application;

[0025] Figure 4 Schematic diagram of contact state of series patch and series contact on adjacent two conductive modules in an embodiment of the present application;

[0026] Figure 5 Schematic diagram of structure of connection switching piece in an embodiment of the present application;

[0027] Figure 6 Schematic diagram of connection of adjacent two connection frames in an embodiment of the present application;

[0028] Figure 7 Schematic diagram of structure of buckle in an embodiment of the present application;

[0029] Figure 8 Exploded view of shell in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present application, the following will make a more comprehensive description of the present application with reference to the related drawings. The drawings show the preferred embodiments of the present application. However, the present application can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0031] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] Referring to Figure 1 and Figure 2 A lithium battery module 10 includes a housing 11, a plurality of single batteries 12 accommodated in the housing 11, and a busbar 13 for connecting the single batteries 12, the busbar 13 including a plurality of conductive modules 100 and a plurality of connection switching pieces 200.

[0034] Referring to Figure 1 and Figure 2 The plurality of conductive modules 100 are correspondingly arranged on the plurality of single batteries 12, each conductive module 100 including a carrier plate 110, a tab patch 120, a parallel contact 130, and a series contact 140 arranged on the carrier plate 110, the tab patch 120, the parallel contact 130, and the series contact 140 being made of a conductive material, and the carrier plate 110 being made of an insulating material, i.e., the tab patch 120, the parallel contact 130, and the series contact 140 are independent of each other and not conductive to each other. The tab patch 120 is electrically connected to the tab of the single battery 12, the parallel contacts 130 of two adjacent conductive modules 100 are in contact with each other, and the series contacts 140 of two adjacent conductive modules 100 are in contact with each other.

[0035] Referring to Figure 1 and Figure 2 A connection switching piece 200 is arranged between each two adjacent conductive modules 100, and the connection switching piece 200 reciprocally slides along the boundary between the two conductive modules 100. For example, a groove is formed on the edge of the carrier plate 110, and a cavity for the connection switching piece 200 to slide is formed when two adjacent carrier plates 110 are connected. For another example, buckles are arranged on the surface of the carrier plate 110, and an outer frame with two open ends is formed by the buckles when two adjacent carrier plates 110 are connected, the connection switching piece 200 is arranged in the outer frame and can reciprocally slide along the boundary between the two conductive modules 100. For another example, a plurality of protective covers 300 are correspondingly arranged on the plurality of carrier plates 110, each protective cover 300 has an avoiding cavity 310 on the edge thereof, and a cavity is formed by the two avoiding cavities 310 when two adjacent protective covers are connected, the connection switching piece 200 is accommodated in the cavity, and the connection switching piece 200 can reciprocally slide along the boundary between the two conductive modules 100 by being pushed and limited.

[0036] The connection switcher 200 is used to electrically connect the tab 120 with the parallel contact 130 or to electrically connect the tab 120 with the series contact 140. When the connection switcher 200 is pushed to electrically connect the tab 120 with the parallel contact 130, the two adjacent single batteries 200 are connected in parallel. When the connection switcher 200 is pushed to electrically connect the tab 120 with the series contact 140, the two adjacent single batteries 200 are connected in series.

[0037] Each connection switcher 200 comprises an insulating tab 210, a parallel tab 220 and a series tab 230. The parallel tab 220 and the series tab 230 are embedded on the same side of the insulating tab 210.

[0038] Please refer to Figure 2 and Figure 5 The parallel tab 220 and the series tab 230 are spaced apart. When the parallel tab 220 contacts the parallel contact 130, the series tab 230 is separated from the series contact 140.

[0039] Please refer to Figure 3 At this time, the parallel tab 220 connects the tab 120 and the parallel contact 130, i.e. the tab of the single battery 200 is in conduction with the parallel contact 130, and the two adjacent single batteries 200 are connected in parallel.

[0040] Please refer to Figure 4 When the series tab 230 contacts the series contact 140, the parallel tab 220 is separated from the parallel contact 130. At this time, the series tab 230 connects the tab 120 and the series contact 140, i.e. the tab of the single battery 200 is in conduction with the series contact 140, and the two adjacent single batteries 200 are connected in series.

[0041] Please refer to Figure 2 In an embodiment, the tab 120 comprises a positive tab 121 and a negative tab 122. The positive tab 121 is electrically connected with the positive tab 12a of the single battery 12, and the negative tab 122 is electrically connected with the negative tab 12b of the single battery 12.

[0042] Please refer to Figure 3 and Figure 4 The parallel contact 130 comprises two positive contact blocks 131 and two negative contact blocks 132. The two positive contact blocks 131 are spaced apart on the first end of the carrier plate 110, and the two negative contact blocks 132 are spaced apart on the second end of the carrier plate 110. The two positive contact blocks 131 on the adjacent two conductive modules 100 are in contact, and the two negative contact blocks 132 on the adjacent two conductive modules 100 are in contact.

[0043] The parallel patch 220 includes two positive conductive sheets 221 and two negative conductive sheets 222. The two positive conductive sheets 221 are arranged on the first end of the insulating tab 210 in a spaced manner, and each positive conductive sheet 221 is used to be attached to a positive contact block 131. The two negative conductive sheets 222 are arranged on the second end of the insulating tab 210 in a spaced manner, and each negative conductive sheet 222 is used to be attached to a negative contact block 132. It should be noted that the two positive conductive sheets 221 on the same parallel patch 220 are arranged side by side, and the two negative conductive sheets 222 on the same parallel patch 220 are also arranged side by side.

[0044] Referring to Figure 3 When the parallel patch 220 is in contact with the parallel contact 130, one end of the positive conductive sheet 221 is in contact with the positive patch 121, and the other end of the positive conductive sheet 221 is in contact with the positive contact block 131, that is, the positive conductive sheet 221 electrically connects the positive lug 12a of the single battery 200 and the positive contact block 131, and the other positive conductive sheet 221 on the parallel patch 220 is also respectively connected to the positive lug 12a and the positive contact block 131 on the adjacent single battery 200, that is, the positive lugs 12a of the adjacent two single batteries 200 are electrically connected,

[0045] In this state, one end of the negative conductive sheet 222 is in contact with the negative patch 122, and the other end of the negative conductive sheet 222 is in contact with the negative contact block 132, that is, the negative conductive sheet 222 electrically connects the positive lug 12a of the single battery 200 and the negative contact block 132, and the other negative conductive sheet 222 on the parallel patch 220 is also respectively connected to the negative lug 12b and the negative contact block 132 on the adjacent single battery 200, that is, the negative lugs 12b of the adjacent two single batteries 200 are electrically connected, so that the adjacent two single batteries 200 are connected in parallel.

[0046] Referring to Figure 2 and Figure 4 In an embodiment, the series contact 140 is located between the positive patch 121 and the negative patch 122, and the series contact 140 has a "cross" structure. The series contact 140 is provided with a connecting end 141, which is used to be attached to the series patch 230.

[0047] The series patch 230 includes an upper patch 231 and a lower patch 232, and the upper patch 231 and the lower patch 232 are arranged on the insulating tab 210 in a spaced manner.

[0048] When the series patch 230 is in contact with the series contact 140, one end of the upper patch 231 is in contact with the positive patch 121, and the other end of the upper patch 231 is in contact with the connecting end 141 on the series contact 140, and the positive lug 12a of the single battery 200 is electrically connected to the series contact 140;

[0049] Meanwhile, at the monomer battery 200 adjacent to the monomer battery 200, one end of the lower patch 232 is in contact with the negative patch 122, and the other end of the lower patch 232 is in contact with the series contact 140 above the monomer battery 200, that is, the negative lug 13b of the monomer battery 200 is electrically connected with the series contact 140, and since the two adjacent series contacts 140 are in contact, the positive lug 12a of the previous monomer battery 200 is electrically connected with the negative lug 12b of the monomer battery 200, and the two adjacent monomer batteries 200 are connected in series.

[0050] Please refer to Figure 2 In order to facilitate the sliding of the insulating push piece 210, the insulating push piece 210 is provided with anti-skid stripes 211.

[0051] Compared with the prior art, the present application has at least the following advantages:

[0052] 1. Only the insulating push piece 210 needs to be pushed to switch the connection state of the adjacent two monomer batteries 12, so that the adjacent two monomer batteries 12 can be flexibly switched between the series connection and the parallel connection, and the assembly fault tolerance is improved.

[0053] 2. Each conductive module 100 has the same structure, and there is no need to select the bus bar 13, thereby reducing the assembly difficulty of the lithium battery module.

[0054] Please refer to Figure 8 Further, in order to flexibly increase or reduce the number of monomer batteries 200 in the lithium battery module 10, so as to assemble a lithium battery module 10 of various specifications, please refer to Figure 8 In an embodiment, the shell 11 comprises a plurality of connection frames 400, the connection frame 400 comprises two foot supports 410 and a heat insulation plate 420, the two foot supports 410 are arranged at intervals, the heat insulation plate 420 is arranged between the two foot supports 410, and the space between the two foot supports 410 is divided into two equal semi-enclosed cavities 4;

[0055] Please refer to Figure 6 and Figure 8 The plurality of connection frames 400 are connected end to end, the semi-enclosed cavities 4 on the adjacent connection frames 400 surround a battery containing cavity 5, and each battery containing cavity 5 is used for containing a monomer battery 200.

[0056] Please refer to Figure 7 and Figure 8, in order to facilitate the multiple adapter frame 400 end-to-end, the shell 11 also includes a plurality of buckles 500, the buckle 500 includes a connecting rod 510 and the hook 520 is provided on both ends of the connecting rod 510, the top of the foot stand 410 and its bottom are provided with two first positioning slots 411 arranged side by side, the first positioning slots 411 on the top and the bottom of the adjacent two foot stands 410 together form two limiting cavities 8, and each limiting cavity 8 is used for accommodating one buckle 500;

[0057] Please refer to Figure 6 and Figure 8 Wherein, each first positioning slot 411 is provided with a first abutment 21 and a first blocking protrusion 22, the first blocking protrusion 22 is located on the side wall of the first abutment 21, and the first blocking protrusion 22 is arranged towards the inner wall of the first positioning slot 411, the inner wall of the first positioning slot 411 and the first abutment 21 together form a first avoiding cavity 6a matched with the connecting rod 510, the inner wall of the first positioning slot 411 and the outer wall of the first blocking protrusion 22 together form a first profiled cavity 7a matched with the hook 520, and the first avoiding cavity 6a and the first profiled cavity 7a are communicated, that is, the first positioning slot 411 includes the first avoiding cavity 6a and the first profiled cavity 7a;

[0058] The shell 11 also includes two end covers 600, two end covers 600 are connected with the adapter frame 400 at both ends of the shell 11, the end cover 600 is in the shape of "C", and the end cover 600 is used for closing the semi-closed cavity 4;

[0059] The top and bottom of each end cover 600 are provided with a second positioning slot 610, and the second positioning slot 610 and the first positioning slot 411 together form a positioning cavity, and the positioning cavity is used for accommodating one buckle 500;

[0060] Wherein, each second positioning slot 610 is provided with a second abutment 620 and a second blocking protrusion 630, the second blocking protrusion 630 is located on the side wall of the second abutment 620, and the second blocking protrusion 630 is arranged towards the inner wall of the second positioning slot 610, the inner wall of the second positioning slot 610 and the second abutment 620 together form a second avoiding cavity 6b matched with the connecting rod 510, the inner wall of the second positioning slot 610 and the outer wall of the second blocking protrusion 630 together form a second profiled cavity 7b matched with the hook 520, and the second avoiding cavity 6b and the second profiled cavity 7b are communicated.

[0061] In order to better illustrate the above shell 11, so as to better understand the concept of the above shell 11.

[0062] Please refer to it again. Figure 8 The outer shell 11 includes multiple connecting frames 400, each connecting frame 400 including two feet 410 and a heat insulation plate 420. The two feet 410 are spaced apart, and the heat insulation plate 420 is disposed between the two feet 410. The heat insulation plate 420 and the two feet 410 form an "I"-shaped support structure, and divide the space between the two feet 410 into two equal semi-closed cavities 4.

[0063] Multiple connecting frames 400 are connected end to end, and the semi-enclosed cavities 4 on adjacent connecting frames 400 form a battery receiving cavity 5, each of which is used to accommodate a single battery 200.

[0064] To facilitate the connection of multiple connecting frames 400 end to end, the outer shell 11 also includes multiple buckles 500. Each buckle 500 includes a connecting rod 510 and barbs 520 disposed at both ends of the connecting rod 510. The connecting rod 510 and the two barbs 520 form a "C" shaped structure. The top and bottom of the foot 410 are provided with two first positioning grooves 411 arranged side by side. The first positioning grooves 411 on the top and bottom of two adjacent feet 410 together form two limiting cavities 8, and each limiting cavity 8 is used to accommodate one buckle 500.

[0065] Each of the first positioning grooves 411 is provided with a first base 21 and a first blocking protrusion 22. The first blocking protrusion 22 is located on the side wall of the first base 21 and is positioned towards the inner wall of the first positioning groove 411. The inner wall of the first positioning groove 411 and the first base 21 together form a first clearance cavity 6a that matches the connecting rod 510. The inner wall of the first positioning groove 411 and the outer wall of the first blocking protrusion 22 together form a first contour cavity 7a that matches the barb 520. The first clearance cavity 6a is connected to the first contour cavity 7a. When the two first positioning grooves 411 are connected, the two first clearance cavities 6a in the two first positioning grooves 411 are connected to form a cavity structure with a "C" shaped cross section, that is, the cross section of the limiting cavity 8 is "C" shaped.

[0066] The outer shell 11 also includes two end caps 600, which are respectively connected to the connecting frames 400 at both ends of the outer shell 11. The end caps 600 are in the shape of a "C" and are used to close the semi-closed cavity 4.

[0067] The top and the bottom of each of the end cover 600 are provided with a second positioning groove 610, which cooperates with the first positioning groove 411 to form a positioning cavity for accommodating one of the buckles 500;

[0068] Each of the second positioning grooves 610 is provided with a second abutment 620 and a second blocking protrusion 630 on the sidewall of the second abutment 620, which is arranged towards the inner wall of the second positioning groove 610. The inner wall of the second positioning groove 610 cooperates with the second abutment 620 to form a second clearance cavity 6b matching the connecting rod 510, and the inner wall of the second positioning groove 610 cooperates with the outer wall of the second blocking protrusion 630 to form a second profiling cavity 7b matching the barb 520. The second clearance cavity 6b and the second profiling cavity 7b are in communication. When the two second positioning grooves 610 are in communication, the two second clearance cavities 6b in the two second positioning grooves 610 are in communication, forming a cavity structure with a "C" shaped cross section, i.e., the cross section of the positioning cavity is in the shape of "C".

[0069] The above embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be understood as the limitation of the scope of the patent. It should be noted that for ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the scope of the present application. Therefore, the scope of the patent protection of the present application should be subject to the appended claims.

Claims

1. A lithium battery module, comprising: A housing, a plurality of individual batteries housed within the housing, and a busbar for connecting each of the individual batteries, characterized in that the busbar includes a plurality of conductive modules and a plurality of connection switching components; Multiple conductive modules are respectively covered on multiple individual cells. Each conductive module includes a carrier plate and tabs, parallel contacts, and series contacts that are spaced apart on the carrier plate. The tabs are electrically connected to the tabs of the individual cells. The parallel contacts of two adjacent conductive modules are in contact with each other, and the series contacts of two adjacent conductive modules are in contact with each other. A connection switching component is slidably disposed between each pair of adjacent conductive modules. Each connection switching component includes an insulating tab, a parallel patch, and a series patch. The parallel patch and the series patch are embedded on the insulating tab and are located on the same side of the insulating tab. The parallel patch is used to connect the electrode tab block and the parallel contact, and the series patch is used to connect the electrode tab block and the series contact. The outer casing includes multiple connecting frames, each connecting frame including two feet and a heat insulation plate. The two feet are spaced apart, and the heat insulation plate is disposed between the two feet, dividing the space between the two feet into two equal semi-enclosed cavities. The multiple connecting frames are connected end to end, and the semi-enclosed cavities on adjacent connecting frames form a battery receiving cavity, each battery receiving cavity being used to accommodate one single battery cell. The outer shell also includes multiple buckles, each buckle including a connecting rod and barbs disposed at both ends of the connecting rod. The top and bottom of the foot are provided with two first positioning grooves arranged side by side. The first positioning grooves on the top and bottom of two adjacent feet together form two limiting cavities, and each limiting cavity is used to accommodate one buckle. The outer shell also includes two end caps, which are respectively connected to the connecting frames at both ends of the outer shell. The end caps are in the shape of a "C" and are used to close the semi-closed cavity. Each end cap has a second positioning groove at its top and bottom. The second positioning groove and the first positioning groove together form a positioning cavity, which is used to accommodate one of the buckles.

2. The lithium battery module according to claim 1, characterized in that, The electrode tab includes a positive electrode tab and a negative electrode tab. The positive electrode tab of the individual battery is electrically connected to the positive electrode tab, and the negative electrode tab of the individual battery is electrically connected to the negative electrode tab.

3. The lithium battery module according to claim 1, characterized in that, The parallel contact includes two positive contact blocks and two negative contact blocks. The two positive contact blocks are spaced apart on the first end of the carrier plate, and the two negative contact blocks are spaced apart on the second end of the carrier plate.

4. The lithium battery module according to claim 3, characterized in that, The parallel patch includes two positive conductive plates and two negative conductive plates. The two positive conductive plates are spaced apart on the first end of the insulating plate, and each positive conductive plate is used to attach to a positive contact block. The two negative conductive plates are spaced apart on the second end of the insulating plate, and each negative conductive plate is used to attach to a negative contact block.

5. The lithium battery module according to claim 2, characterized in that, The series contact is located between the positive electrode patch and the negative electrode patch. The series contact is provided with a connection end, which is used to fit with the series patch. The series contact has a cross-shaped structure.

6. The lithium battery module according to claim 1, characterized in that, The series patch includes an upper patch and a lower patch, which are spaced apart on the insulating tab.

7. The lithium battery module according to claim 1, characterized in that, The insulating paddle is provided with anti-slip stripes.

8. The lithium battery module according to claim 1, characterized in that, The busbar also includes multiple protective covers, which are respectively placed on multiple carrier plates.

9. The lithium battery module according to claim 1, characterized in that, Each of the first positioning slots is provided with a first base and a first blocking protrusion. The first blocking protrusion is located on the side wall of the first base and is positioned facing the inner wall of the first positioning slot. The inner wall of the first positioning slot and the first base together form a first clearance cavity that matches the connecting rod. The inner wall of the first positioning slot and the outer wall of the first blocking protrusion together form a first contour cavity that matches the barb. The first clearance cavity and the first contour cavity are connected. That is, the first positioning slot includes the first clearance cavity and the first contour cavity.

10. The lithium battery module according to claim 1, characterized in that, Each of the second positioning slots is provided with a second base and a second blocking protrusion. The second blocking protrusion is located on the side wall of the second base and is positioned facing the inner wall of the second positioning slot. The inner wall of the second positioning slot and the second base together form a second clearance cavity that matches the connecting rod. The inner wall of the second positioning slot and the outer wall of the second blocking protrusion together form a second contour cavity that matches the barb. The second clearance cavity and the second contour cavity are in communication.

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