Battery module and sampling connection system

Abstract

The invention relates to the technical field of new energy automobiles, in particular to a battery module and a sampling connection system. The battery module comprises a busbar, a fixed bracket and a plurality of single batteries; the two tabs of every two adjacent single batteries are arranged in a lap joint manner; one side surface of the tab of one single battery is attached to the fixed bracket, the other side surface of the tab of one single battery is attached to one side surface of the tab of the adjacent single battery, and the other side surface of the tab of the adjacent single battery is attached to the busbar; and the busbar is connected with the fixed bracket so as to tightly press the two tabs of the two adjacent single batteries. According to the battery module and the sampling connection system provided by the invention, a series of problems caused by the fact that two tabs of two battery cells are converged in a welding manner in the prior art are solved.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicles, and in particular to a battery module and a sampling connection system. Background Art

[0002] In recent years, the penetration rate and market share of electric vehicles in the automobile market have continued to increase, and the new energy automobile industry has risen to a strategic emerging industry for key development. The competition landscape in the automobile industry, especially in new energy vehicles, is complex and changeable, and the competition situation is severe. As one of the core assemblies in electric vehicles, power batteries have a great impact on the performance, safety, and competitiveness of the entire vehicle.

[0003] The existing module sampling system needs to meet the battery cell voltage and temperature sampling functions required by the BMS. At the same time, high-voltage electrical connections are required between the battery cells in the battery pack / battery module.

[0004] As an important packaging method for consumer and power lithium-ion batteries, soft-pack cells have thinner tabs, which require higher sampling connection technology and connection reliability. Currently, laser or ultrasonic welding technology is generally used to connect the tabs of soft-pack cells. For welding thin metal materials such as tabs, single-mode lasers are generally used, which have concentrated beams, uniform and smooth welds, and high processing efficiency.

[0005] When welding the two tabs of two battery cells, a busbar is needed for support, and then the tabs need to be pre-bent and compressed before welding. However, the tight contact between the tabs and the busbar is required during compression. Poor compression can easily cause welding holes and even scrap the battery cells. In addition, the above welding method is prone to weld failure under external factors such as vibration and shock. In addition, because the tabs are relatively soft, in extreme cases, the current can only flow through the weld area between the tabs of the battery cells in series and parallel, and the width and length of the weld are affected by the power of the welding equipment and the length of the tab itself. The width of the welding interface generally does not exceed 2mm, and the current only flows through the weld area. The current carrying capacity is weak and the temperature rises, which will affect the battery performance and test results. Summary of the invention

[0006] The purpose of the present application is to provide a battery module and a sampling connection system, thereby solving a series of problems existing in the existing method of welding two pole ears of two battery cells for current convergence.

[0007] According to the first aspect of the present application, a battery module is provided, which includes a bus, a fixing bracket and a plurality of single cells; the two pole ears of two adjacent single cells are overlapped with each other; one side of the pole ear of one of the single cells is attached to the fixing bracket, the other side of the pole ear of one of the single cells is attached to one side of the pole ear of the adjacent single cell, and the other side of the pole ear of the adjacent single cell is attached to the bus; the bus is connected to the fixing bracket to press the two pole ears of two adjacent single cells.

[0008] In any of the above technical solutions, further, the fixed bracket includes a plurality of windows; the pole lugs led out of each of the single cells are bent after passing through the windows, and the pole lugs led out of each of the single cells include an extension section arranged in the windows and a bending section parallel to the fixed bracket; the bending section of each pole lug is overlapped with the bending section of the adjacent pole lug; the bending section of the pole lug of one of the single cells fits the fixed bracket, and the bending section of the pole lug of the adjacent single cell fits the bus; the bus is connected to the fixed bracket to press the bending sections of two adjacent pole lugs.

[0009] In any of the above technical solutions, further, each of the single cells includes a length direction, a width direction and a thickness direction; the multiple single cells are arranged along the thickness direction; the positive and negative ears of each single cell are led out from one end of the single cell; the extension sections of the positive and negative ears of each single cell extend along the length direction, and the extension sections of the positive and negative ears of each single cell are arranged in the width direction of the single cell; the bent sections of the positive and negative ears of each single cell extend along the thickness direction in opposite directions; the bent section of the positive ear of each single cell is overlapped with the bent section of the negative ear of the adjacent single cell; there are multiple bus bars, and each of the bus bars is connected to the fixed bracket to press the bent sections of the adjacent positive and negative ears.

[0010] In any of the above technical solutions, further, the bending section of the positive ear and the bending section of the negative ear of the single battery are both rectangular; the overlapping position of the bending section of the positive ear and the bending section of the negative ear is defined as the overlapping portion; the bus is rectangular; the dimension of the bus in the thickness direction is greater than or equal to the dimension of the overlapping portion in the thickness direction; the dimension of the bus in the width direction is greater than or equal to the dimension of the overlapping portion in the width direction.

[0011] In any of the above technical solutions, further, the dimension of the busbar in the width direction is 1.2 to 1.8 times the dimension of the overlapping portion in the width direction.

[0012] In any of the above technical solutions, further, the busbar is made of metal, and the thickness of the busbar is 1 mm to 2 mm.

[0013] In any of the above technical solutions, further, the busbar is made of hard plastic, and the thickness of the busbar is 2 mm to 10 mm.

[0014] In any of the above technical solutions, further, the busbar is detachably connected to the fixing bracket.

[0015] In any of the above technical solutions, further, both ends of the busbar opposite to each other in the width direction are provided with threaded through holes; and the fixing bracket is provided with threaded mounting holes corresponding to the threaded through holes.

[0016] In any of the above technical solutions, further, both ends of the busbar opposite to each other in the width direction are provided with a first clamping body; and the fixing bracket is provided with a second clamping body corresponding to the first clamping body.

[0017] In any of the above technical solutions, further, both ends of the busbar opposite to each other in the width direction are provided with notches; and the fixing bracket is provided with a protrusion that is interference-fitted with the notches.

[0018] In any of the above technical solutions, further, the bent section of the positive electrode ear and the bent section of the negative electrode ear of the single battery are both arc-shaped; and the busbar includes an arc-shaped contact surface that conforms to the bent section of the positive electrode ear and the bent section of the negative electrode ear.

[0019] According to a second aspect of the present application, a sampling connection system is provided, comprising the battery module as described above.

[0020] In any of the above technical solutions, further, the sampling connection system also includes a temperature acquisition device for acquiring the temperature of the single battery and a voltage acquisition device for acquiring the voltage of the single battery.

[0021] The battery module of the present application includes a busbar, a fixing bracket and a plurality of single cells. The two tabs of two adjacent single cells are overlapped with each other; one side of the tab of one single cell fits the fixing bracket, the other side of the tab of one single cell fits one side of the tab of the adjacent single cell, and the other side of the tab of the adjacent single cell fits the busbar; the busbar is connected to the fixing bracket to press the two tabs of the two adjacent single cells.

[0022] According to the above technical features, the beneficial effects of this application are:

[0023] The two pole tabs of two adjacent single cells of the present application are overlapped with each other, and the two adjacent pole tabs are clamped by a bus bar and a fixing bracket so that the two adjacent pole tabs are in close contact and fit.

[0024] The present application achieves the purpose of simplifying welding to crimping by clamping the busbar and the fixing bracket. Compared with the prior art, the clamping method of the present application will not cause the problem of welding holes or even the scrapping of the battery cell due to the welding of the pole ear; nor will it cause the problem of welding failure of the battery pack due to external factors such as vibration and impact; and the two adjacent pole ears of the present application are in close contact and fit, with a large flow area and good effect.

[0025] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram showing the structure of the battery module of the present application before the busbar and the fixing bracket are installed;

[0028] Figure 2 Show Figure 1 A magnified schematic diagram of part A;

[0029] Figure 3 Show Figure 1 Partial schematic diagram after installing the fixing bracket;

[0030] Figure 4 Show Figure 3 Partial schematic diagram after busbar installation.

[0031] Icon: 100-single cell; 110-top seal; 101-positive electrode ear; 102-negative electrode ear; 1011-extension section; 1012-bending section; 200-bus; 201-threaded through hole; 300-fixed bus; 400-fixed bracket; 401-window; X-length direction; Y-width direction; Z-thickness direction. DETAILED DESCRIPTION

[0032] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0033] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0034] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0035] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0036] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0037] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0038] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0039] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0040] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0041] When the existing module sampling system samples the voltage and temperature of the battery cells of the battery module, there are some problems in the grouping of the battery module, which in turn affects the battery performance test results. For example, there are a series of problems in the welding method of the tabs of each single battery.

[0042] For example, when welding the two tabs of two battery cells, a busbar is needed for support, and then the tabs need to be pre-bent and compressed before welding. However, the tight contact between the tabs and the busbar is required during compression, and poor compression can easily cause welding holes and even cause the battery cells to be scrapped. In addition, the above welding method is prone to weld failure under external factors such as vibration and shock. In addition, because the tabs are relatively soft, in extreme cases, the current can only flow through the weld area between the tabs of the battery cells in series and parallel, and the width and length of the weld are affected by the power of the welding equipment and the length of the tab itself. The width of the welding interface generally does not exceed 2mm, and the current only flows through the weld area, the current carrying capacity is weak, and the temperature rises, which will affect the battery performance and test results.

[0043] The first aspect of the present application provides a battery module to solve the above-mentioned series of problems.

[0044] The following will refer to Figures 1 to 4 A battery module according to some embodiments of the present application is described.

[0045] like Figure 4 As shown, the battery module of the present application includes a busbar 200, a fixing bracket 400 and a plurality of single cells 100. The two tabs of two adjacent single cells 100 are overlapped with each other; one side of the tab of one single cell 100 is attached to the fixing bracket 400, the other side of the tab of one single cell 100 is attached to one side of the tab of the adjacent single cell 100, and the other side of the tab of the adjacent single cell 100 is attached to the busbar 200; the busbar 200 is connected to the fixing bracket 400 to press the two tabs of the two adjacent single cells 100.

[0046] That is to say, the two pole ears of the two adjacent single cells 100 of the present application are overlapped with each other, and the two adjacent pole ears are clamped by the bus 200 and the fixed bracket 400, so that the two adjacent pole ears are in close contact and fit. The present application achieves the purpose of simplifying welding to crimping by clamping the bus 200 and the fixed bracket 400. Compared with the prior art, the clamping method of the present application will not cause the problem of pole ear welding causing welding holes or even causing the battery cell to be scrapped; nor will it cause the battery pack to fail due to external factors such as vibration and impact; and the two adjacent pole ears of the present application are in close contact and fit, with a large flow area and good effect.

[0047] like Figure 1 and Figure 2 As shown, for the convenience of description, the length direction X, width direction Y and thickness direction Z of the single battery 100 are described in detail below as direction references. Among them, the length direction X, width direction Y and thickness direction Z are perpendicular to each other.

[0048] In the embodiments of the present application, Figure 2 As shown, multiple single battery cells 100 are arranged along the thickness direction Z, and the positive electrode ear 101 and the negative electrode ear 102 of each single battery are led out from the top sealing edge 110 at one end of the single battery cell 100; and the positive electrode ear 101 and the negative electrode ear 102 of each single battery cell 100 are arranged in the width direction Y of the single battery cell 100.

[0049] like Figure 3 As shown, the fixing bracket 400 includes a plurality of openings 401; the tabs leading out of each single battery 100 are bent after passing through the openings 401, as shown in FIG. Figure 2 and Figure 3 As shown, the tabs extending from each single battery 100 include an extension section 1011 disposed in the window 401 and a bent section 1012 parallel to the fixing bracket 400. The extension sections 1011 of the positive tab 101 and the negative tab 102 of each single battery 100 extend along the length direction X, and the extension sections 1011 of the positive tab 101 and the negative tab 102 of each single battery 100 are arranged in the width direction Y of the single battery 100 respectively; the bent sections 1012 of the positive tab 101 and the negative tab 102 of each single battery 100 extend along the thickness direction Z, and in opposite directions.

[0050] When the tabs of two adjacent single batteries 100 are clamped, the bent section 1012 of each tab is overlapped with the bent section 1012 of the adjacent tab; the bent section 1012 of the tab of one of the single batteries 100 fits the fixing bracket 400, and the bent section 1012 of the tab of the adjacent single battery 100 fits the bus 200; the bus 200 is connected to the fixing bracket 400 to press the bent sections 1012 of the two adjacent tabs.

[0051] As an example, when a plurality of single cells 100 of a battery module are connected in series:

[0052] The bent section 1012 of the positive electrode ear 101 of each single battery 100 is overlapped with the bent section 1012 of the negative electrode ear 102 of the adjacent single battery 100; there are multiple busbars 200, and each busbar 200 is connected to the fixing bracket 400 to compress the bent sections 1012 of the adjacent positive electrode ears 101 and negative electrode ears 102.

[0053] In addition, if Figure 4 As shown, the battery module further includes two fixed busbars 300, and the two fixed busbars 300 respectively press the positive electrode ears of the single battery located at the outermost side and the negative electrode ears of the single battery located at the outermost side.

[0054] In the embodiment of the present application, each bus bar 200 may be connected to the fixing bracket 400 in a detachable manner.

[0055] As an example, Figure 4 As shown, both ends of the busbar 200 opposite to each other in the width direction Y are provided with threaded through holes 201, and the fixing bracket 400 is provided with threaded mounting holes corresponding to the threaded through holes 201. The two are connected by bolts.

[0056] As a second example, both ends of the busbar 200 that are opposite to each other in the width direction Y are provided with a first clamping body, and the fixing bracket 400 is provided with a second clamping body that is correspondingly clamped with the first clamping body. The two are clamped with each other.

[0057] As a third example, both ends of the busbar 200 opposite to each other in the width direction Y are provided with a notch (through hole or blind hole), and the fixing bracket 400 is provided with a protrusion that is interference-fitted with the notch. The two are installed by interference fit.

[0058] In the embodiments of the present application, Figure 4 As shown, the bent section 1012 of the positive electrode tab 101 and the bent section 1012 of the negative electrode tab 102 of the single battery 100 are both rectangular, and the overlapping position of the bent section 1012 of the positive electrode tab 101 and the bent section 1012 of the negative electrode tab 102 is defined as the overlapping portion.

[0059] The busbar 200 is rectangular, and the dimension of the busbar 200 in the thickness direction Z is greater than or equal to the dimension of the overlapping portion in the thickness direction Z, and the dimension of the busbar 200 in the width direction Y is greater than or equal to the dimension of the overlapping portion in the width direction Y.

[0060] Preferably, the size of the busbar 200 in the width direction Y is 1.2 to 1.8 times the size of the overlapped portion in the width direction Y. In this way, not only is the pressing effect better, but also the two tabs are ensured to be in close contact and fit, the flow area is large, and the effect is good. Moreover, when the busbar 200 is made of metal, the flow effect can be further improved. In addition, the portion of the busbar 200 that has more overlapped portions in the width direction Y can also be provided with the threaded through hole 201, the first clamping body, and the defect portion as described above.

[0061] Preferably, the dimension of the busbar 200 in the thickness direction Z is equal to the dimension of the overlapping portion in the thickness direction Z. In this way, the pressing effect is better, ensuring that the two tabs are in close contact and fit, with a large flow area and good effect.

[0062] When designing the area and thickness of the busbar 200 , the volume of the conductor used can be reduced based on reasonable data verification; or instead of using a conductor, a high-hardness plastic or elastic material can be used for compression connection.

[0063] As an example, when the busbar 200 is made of metal, such as copper or aluminum, the thickness of the busbar 200 is 1 mm to 2 mm. When the busbar 200 is made of hard plastic or elastic material, the thickness of the busbar 200 is 2 mm to 10 mm.

[0064] In the embodiment of the present application, the shape of the busbar 200 can be a plane or an arc surface to ensure close contact between the pole ears. By reasonably designing the shape of the busbar 200, the shape of the fitting surface between the busbar 200 and the pole ears of the soft-pack battery cell can be indirectly controlled, such as plane fitting and curved fitting, to achieve effective assembly positioning, simplify the positioning structure and assembly process, and at the same time ensure an effective flow area. That is, the bending section 1012 of the positive pole ear 101 of the single battery 100 and the bending section 1012 of the negative pole ear 102 can both be arc-shaped, and the busbar 200 includes an arc-shaped contact surface that imitates the bending section 1012 of the positive pole ear 101 and the bending section 1012 of the negative pole ear 102.

[0065] When assembling the battery assembly or setting up the bench test, the series-parallel connection of the soft-packed single cells 100 is involved. The principle of the series-parallel connection is to achieve reliable and close contact between the tabs of adjacent single cells 100. In this embodiment, the single cells 100 are stacked first, and then the fixing bracket 400 is installed. The tabs need to penetrate through the window 401 of the fixing bracket 400, bend the tabs, install the busbar 200, and screw or clamp them at the fixing point.

[0066] The process of building a bench test cell group or assembling a battery module assembly is briefly described as follows:

[0067] The first step is to determine the required series-parallel specifications of the single battery cells 100 and the total number of the single battery cells 100.

[0068] The second step is to stack the test single cells 100 into groups.

[0069] Step 3: Install the fixing bracket 400.

[0070] The fourth step is to bend the tabs. Since welding is not necessary, the bending in this step only needs to be done at a certain angle and does not require complete flatness. In the next step of installing the busbar 200, close contact between the tabs of different single cells 100 can be ensured.

[0071] Step 5: Crimping and installing busbar 200. This step can be installed manually by one person.

[0072] Step 6: Conduct the experiment.

[0073] Step 7: The module after the test can be disassembled to facilitate other tests or disassembly.

[0074] According to a second aspect of the present application, a sampling connection system is provided, comprising the above battery module; the sampling connection system further comprises a temperature acquisition device for acquiring the temperature of a single battery and a voltage acquisition device for acquiring the voltage of a single battery.

[0075] In summary, the present application simplifies welding to screw connection or crimping by changing the relative positions of the bus and the pole ear, which can be flexibly matched to achieve overall optimization of the sampling connection system; at the same time, by adjusting the size of the bus, it can ensure that the clamping force between the pole ear and the bus is uniform, increase mechanical reliability, and avoid weld failure caused by external factors such as vibration and shock.

[0076] Compared with welding connection, the crimping provided in this application can ensure a stable cross-sectional area of ​​flow, which can be increased exponentially compared with the welding weld width area and the accompanying contact flow area. When the thickness of the tab is limited, it can release the flow restriction of the electrical connection structure and improve the high-rate charge and discharge capability of the soft-pack battery system; thereby further improving the richness of the test data and helping to improve the performance of the entire vehicle.

[0077] Compared with welding connection, the crimping provided by this application has lower requirements for the cleanliness and surface of the tabs, can simplify the process flow, and ensure effective compression connection. At the same time, compared with welding connection, this connection method is easy to disassemble and adjust, and the battery pack can be repeatedly built during the bench test, which enhances the flexibility of battery performance tests.

[0078] Compared with welding connection, the clamping method of the present application will not cause the problem of welding holes caused by the welding of the pole ears or even cause the battery cell to be scrapped.

[0079] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. A battery module, characterized in that: The battery module includes a bus bar, a fixing bracket and a plurality of single cells; The two tabs of two adjacent single cells are overlapped and arranged; One side of the pole ear of one of the single cells is attached to the fixing bracket, the other side of the pole ear of one of the single cells is attached to one side of the pole ear of the adjacent single cell, and the other side of the pole ear of the adjacent single cell is attached to the busbar; The busbar is connected to the fixing bracket to press the two tabs of the two adjacent single cells.

2. The battery module according to claim 1, characterized in that: The fixing bracket includes a plurality of openings; The tabs led out of each single cell are bent after passing through the window, and each tab led out of the single cell includes an extension section arranged in the window and a bending section parallel to the fixing bracket; The bending section of each pole lug is overlapped with the bending section of an adjacent pole lug; The bent section of the pole ear of one of the single cells is in contact with the fixing bracket, and the bent section of the pole ear of the adjacent single cell is in contact with the busbar; The busbar is connected to the fixing bracket to press the bent sections of two adjacent pole ears.

3. The battery module according to claim 2, characterized in that: Each of the single cells includes a length direction, a width direction and a thickness direction; The plurality of single cells are arranged along the thickness direction; The positive electrode ear and the negative electrode ear of each single cell are led out from one end of the single cell; The extension sections of the positive and negative lugs of each of the single cells extend along the length direction, and the extension sections of the positive and negative lugs of each of the single cells are arranged in the width direction of the single cells; The bent sections of the positive electrode ear and the negative electrode ear of each single battery extend along the thickness direction and in opposite directions; The bent section of the positive electrode ear of each single cell is overlapped with the bent section of the negative electrode ear of the adjacent single cell; There are a plurality of busbars, and each of the busbars is connected to the fixing bracket to press the bent sections of the adjacent positive and negative pole ears.

4. The battery module according to claim 3, characterized in that: The bent section of the positive electrode ear and the bent section of the negative electrode ear of the single battery are both rectangular; The overlapped position of the bent section of the positive electrode ear and the bent section of the negative electrode ear is defined as the overlapped portion; The busbar is rectangular; The dimension of the busbar in the thickness direction is greater than or equal to the dimension of the overlapping portion in the thickness direction; A dimension of the busbar in the width direction is greater than or equal to a dimension of the overlapping portion in the width direction.

5. The battery module according to claim 4, characterized in that: A dimension of the busbar in the width direction is 1.2 to 1.8 times a dimension of the overlapping portion in the width direction.

6. The battery module according to claim 4, characterized in that: The busbar is made of metal, and has a thickness of 1 mm to 2 mm.

7. The battery module according to claim 4, characterized in that: The busbar is made of hard plastic, and has a thickness of 2 mm to 10 mm.

8. The battery module according to claim 4, characterized in that: The busbar is detachably connected to the fixing bracket.

9. The battery module according to claim 8, characterized in that: The busbar is provided with threaded through holes at both ends opposite to each other in the width direction; The fixing bracket is provided with a threaded mounting hole corresponding to the threaded through hole.

10. The battery module according to claim 4, characterized in that: The busbar is provided with a first clamping body at both ends opposite to each other in the width direction; The fixing bracket is provided with a second clamping body corresponding to the first clamping body.

11. The battery module according to claim 4, characterized in that: The busbar has notched portions at both ends opposite to each other in the width direction; The fixing bracket is provided with a protrusion which is interference fit with the notched portion.

12. The battery module according to claim 3, characterized in that: The bent section of the positive electrode ear and the bent section of the negative electrode ear of the single battery are both arc-shaped; The busbar includes an arc-shaped contact surface that conforms to the bent section of the positive electrode tab and the bent section of the negative electrode tab.

13. A sampling connection system, characterized in that: A battery module as claimed in any one of claims 1 to 12; The sampling connection system further comprises a temperature acquisition device for acquiring the temperature of the single cell and a voltage acquisition device for acquiring the voltage of the single cell.

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