Battery module and battery pack
By setting temperature sampling points on the side wall of the battery cell and using the side acquisition structure, the problem of inaccurate temperature acquisition of the battery system is solved, and high-precision temperature acquisition under high-speed charging conditions is achieved.
Patent Information
- Application Number
- CN202510510723.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2025-07-18
AI Technical Summary
In the prior art, the temperature acquisition of the battery system is inaccurate, especially for large-scale or high-power battery systems. Due to space and weight limitations, the temperature of the busbar is too high and cannot accurately reflect the battery cell temperature. The liquid-cooled plate is installed on the top cover plate to affect the accuracy of temperature acquisition.
The temperature sampling point is set on the side wall of the battery cell, and connected to the pole column and the temperature sampling point through the first voltage acquisition structure and the first temperature sensing structure on the first sampling circuit board to realize side temperature acquisition and avoid the influence of bus temperature rise and liquid cooling plate.
It improves the accuracy of battery cell temperature acquisition, reduces the difficulty of liquid-cooled plate design, and ensures the accuracy of temperature acquisition under high-speed charging conditions.
Smart Images
Figure CN120341522A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of batteries, and more particularly, to a battery module and a battery pack. Background Art
[0002] For a conventional square battery cell, its temperature acquisition NTC (Negative Temperature Coefficient) is usually arranged on the bus bar. The bus bar is welded to the battery cell terminal post, and the temperature of the battery cell is indirectly reflected by monitoring the temperature of the bus bar.
[0003] However, for a large rate or high-power battery system, the charge and discharge rate is high and the current value is large. However, due to space and weight limitations, the current-carrying area of the bus bar is relatively small, resulting in a relatively high temperature, and it cannot accurately reflect the temperature of the battery cell. Further, in the prior art, the NTC is also placed on the top cover plate of the battery cell. However, due to the high charge and discharge rate, a liquid cooling plate needs to be provided on the top cover plate, which will affect the accuracy of temperature acquisition. Summary of the Invention
[0004] The purpose of the present invention is to provide a battery module and a battery pack, which can collect the temperature of the battery cell through a side collection method to ensure the accuracy of the collected temperature.
[0005] In a first aspect, the present invention provides a battery module, including:
[0006] A plurality of battery cells stacked along a first direction, with terminal posts provided at the top of the battery cells, and temperature sampling points provided on the side walls of the battery cells;
[0007] A first sampling circuit board, partially disposed at the top of the plurality of battery cells. A plurality of first voltage acquisition structures and first temperature sensing structures are provided on the first sampling circuit board. The first voltage acquisition structures are spaced along the first direction on one side of the second direction of the first sampling circuit board and are connected to the terminal posts, and are configured to collect the voltage of the battery cells. The first temperature sensing structures are spaced along the first direction on the other side of the second direction of the first sampling circuit board and are connected to the temperature sampling points, and are configured to collect the temperature of the side walls of the battery cells. The first direction is perpendicular to the second direction.
[0008] In an optional embodiment, the first temperature sensing structure includes a connecting band, a temperature sensing resistor, and a collection connecting plate. The collection connecting plate is disposed on the first sampling circuit board and extends toward the temperature sampling point. The temperature sensing resistor is disposed on the collection connecting plate. One end of the connecting band is connected to the temperature sensing resistor, and the other end is connected to the temperature sampling point.
[0009] In an optional embodiment, the first sampling circuit board is overlapped on the top edge of the battery cell, the first voltage collection structure is arranged on one side edge of the first sampling circuit board and extends to the pole, and the collection connection board is arranged on the other side edge of the first sampling circuit board and extends toward the side wall of the battery cell.
[0010] In an optional embodiment, the acquisition connection board includes a first connection portion and a second connection portion that are integrally arranged, one end of the first connection portion is connected to a side of the first sampling circuit board away from the first voltage acquisition structure, and the other end extends toward the first voltage acquisition structure, the second connection portion is bent relative to the first connection portion and adhered to the side wall of the battery cell, and the temperature sensitive resistor is arranged on the second connection portion.
[0011] In an optional embodiment, the collection connection plate is integrally arranged on the edge of the first sampling circuit board and is bent relative to the first sampling circuit board toward the side wall of the battery cell. An isolation limit plate is also provided between the collection connection plate and the battery cell. The isolation limit plate is at least partially attached to the side wall of the battery cell, and the collection connection plate is attached to the isolation limit plate.
[0012] In an optional embodiment, the isolation and limit plate extends to the temperature sampling point, and a clearance hole is opened on the isolation and limit plate, and the connecting belt includes an integrally arranged fixing portion, a bending portion and a contact portion, the fixing portion is connected to the temperature sensing resistor, the bending portion is bent and connected to the fixing portion and is passed through the clearance hole, the contact portion is connected to the bending portion and is connected to the temperature sampling point, and the isolation and limit plate is pressed on the contact portion.
[0013] In an optional embodiment, a surface of one side of the contact portion away from the temperature sampling point is partially recessed to form a contact groove, and a contact protrusion is formed on the other side surface.
[0014] In an optional embodiment, a guiding arc groove is further provided on the isolation limiting plate, and the guiding arc groove is provided at the bottom end of the clearance hole and is configured to realize guiding assembly of the contact part.
[0015] In an optional embodiment, the isolation and limiting plate includes a first isolation portion and a second isolation portion, the first isolation portion is bonded to the top of the battery cell by structural adhesive, and the second isolation portion is bent and connected to the first isolation portion and bonded to the side wall of the battery cell.
[0016] In an alternative embodiment, a bonding wire is formed at the connection between the first sampling circuit board and the acquisition connection board, and the width of the first sampling circuit board along the extending direction of the bonding wire is greater than the width of the acquisition connection board in the same direction. The first sampling circuit board is provided with anti-tearing notches at at least one end of the bonding wire.
[0017] In an alternative embodiment, the battery module further includes a second sampling circuit board, on which a second voltage acquisition structure and a second temperature sensing structure are provided. The second voltage acquisition structure is connected to the pole post and configured to acquire the voltage of the battery cell. The pole post is further connected to an electrical connection row, and the second temperature sensing structure is connected to the electrical connection row and configured to acquire the temperature of the electrical connection row.
[0018] In an alternative embodiment, an explosion-proof valve is further provided on the side wall of the battery cell.
[0019] In a second aspect, the present invention provides a battery pack, including a box body and the battery module according to any one of the foregoing embodiments, and the battery cells are accommodated in the box body.
[0020] The beneficial effects of the embodiments of the present invention are as follows:
[0021] In the battery module provided by the embodiments of the present invention, a temperature sampling point is provided on the side wall of the battery cell, and a first voltage acquisition structure and a first temperature sensing structure are provided on the first sampling circuit board. The first voltage acquisition structure is connected to the pole post and can acquire the voltage of the battery cell, while the first temperature sensing structure is connected to the temperature sampling point to acquire the temperature of the side wall of the battery cell. Compared with the prior art, in the embodiments of the present invention, by setting the temperature sampling point on the side wall of the battery cell and using the first temperature sensing structure to connect to the side wall of the battery cell for temperature sampling, on the one hand, the temperature inaccuracy caused by the temperature rise of the bus bar is avoided, and on the other hand, the influence of the external cooling structure on temperature sampling is also avoided. The temperature of the battery cell is sampled by the side wall sampling method to ensure the accuracy of the sampled temperature. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.
[0023] Figure 1 It is a schematic structural diagram of the first battery module provided by the embodiments of the present invention from a first perspective;
[0024] Figure 2Schematic diagram of the first battery module provided by an embodiment of the present invention from a second perspective;
[0025] Figure 3 For Figure 2 Partial enlarged schematic diagram at position III in
[0026] Figure 4 For Figure 1 Schematic diagram of the first sampling circuit board in
[0027] Figure 5 For Figure 1 Schematic diagram of the battery cell in
[0028] Figure 6 Schematic diagram of the second battery module provided by an embodiment of the present invention;
[0029] Figure 7 For Figure 6 Partial enlarged schematic diagram at position VII in
[0030] Figure 8 For Figure 6 Partial assembly structure schematic diagram of the first sampling circuit board in
[0031] Figure 9 Exploded view of the partial structure of the second battery module provided by an embodiment of the present invention;
[0032] Figure 10 For Figure 9 Schematic diagram of the connecting strap in
[0033] Figure 11 For Figure 8 Partial assembly structure schematic diagram of the isolation and limiting plate in
[0034] Icons: 100 - battery module; 110 - battery cell; 111 - terminal; 112 - temperature sampling point; 120 - first sampling circuit board; 121 - first voltage acquisition structure; 122 - first temperature sensing structure; 123 - bonding wire; 124 - anti - tearing notch; 130 - connecting strap; 131 - fixing part; 132 - bending part; 133 - contact part; 134 - contact groove; 140 - temperature sensing resistor; 150 - acquisition connection board; 151 - first connection part; 152 - second connection part; 160 - isolation and limiting plate; 161 - relief hole; 162 - guiding arc groove; 163 - first isolation part; 164 - second isolation part; 170 - second sampling circuit board; 171 - second voltage acquisition structure; 172 - second temperature sensing structure; 180 - explosion - proof valve; 200 - battery pack; 210 - box body. Detailed implementation manners
[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.
[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.
[0037] It should be noted that: like reference numerals and letters denote like items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0038] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is habitually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as a limitation of the present invention.
[0039] In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.
[0040] As disclosed in the background art, conventional square battery cells generally have a valve opened at the top, and when thermal runaway occurs, they spray towards the upper passenger compartment, causing safety problems. Moreover, the pole and the explosion-proof valve are located on the same side, and reliable liquid cooling cannot be performed at this location. When placing a liquid cooling plate, the position of the explosion-proof valve needs to be avoided, increasing the design difficulty. The traditional NTC is arranged on the busbar, and the busbar is welded to the battery cell pole. Usually, the temperature of the battery cell is indirectly reflected by monitoring the temperature of the busbar. However, for a large-rate or high-power battery system, the charge and discharge rate is high and the current value is large. However, due to space and weight limitations, the current-carrying area of the busbar is relatively small, resulting in a relatively high temperature and unable to accurately reflect the temperature of the battery cell. Further, in the prior art, the NTC is also placed on the top cover plate of the battery cell. However, due to thermal management requirements, a liquid cooling plate needs to be provided on the top cover plate of the battery cell, which will affect the accuracy of temperature acquisition.
[0041] To solve the above problems, embodiments of the present invention provide a novel battery module and battery pack. It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.
[0042] Refer to Figure 1 , embodiments of the present invention provide a battery module 100, which can collect the temperature of the battery cell 110 through a side collection method to ensure the accuracy of the collected temperature. At the same time, it can avoid the influence of designing a liquid cooling plate on the top, reducing the design difficulty of the liquid cooling plate.
[0043] The battery module 100 provided by the embodiments of the present invention includes a first sampling circuit board 120 and a plurality of battery cells 110. The plurality of battery cells 110 are stacked along a first direction. A terminal post 111 is provided at the top end of the battery cell 110, and a temperature sampling point 112 is provided on the side wall of the battery cell 110. A part of the first sampling circuit board 120 is disposed at the top of the plurality of battery cells 110. And a plurality of first voltage collection structures 121 and a first temperature sensing structure 122 are provided on the first sampling circuit board 120. The first voltage collection structures 121 are spaced along the first direction on one side of the first sampling circuit board 120 in a second direction and are connected to the terminal post 111, and are configured to collect the voltage of the battery cell 110. The first temperature sensing structure 122 is spaced along the first direction on the other side of the first sampling circuit board 120 in the second direction and is connected to the temperature sampling point 112, and is configured to collect the temperature of the side wall of the battery cell 110. The first direction is perpendicular to the second direction.
[0044] It should be noted that here the battery cell 110 is a square battery cell, and the first sampling circuit board 120 can be an FPC board, which includes a conductive layer and PI layers coated on both sides of the conductive layer. The conductive layer can be a conductive metal material, such as copper. The specific structure and circuit connection principle can refer to the existing FPC board. Further, the first direction refers to the direction perpendicular to the large surface of the battery cell 110. The plurality of battery cells 110 are stacked in sequence along the first direction, and the large surfaces of the battery cells 110 are mutually attached. A part of the first sampling circuit board 120 is disposed at the top of the battery cell 110, and voltage collection is realized through the first voltage collection structure 121, and temperature collection is realized through the first temperature sensing structure 122. Compared with the conventional stacking structure of the square battery cell 110, the embodiments of the present invention can realize the collection of the side wall temperature of the battery cell 110, replacing the conventional top temperature collection scheme, ensuring the accuracy of the collected temperature. At the same time, it can avoid the influence of designing a liquid cooling plate on the top, reducing the design difficulty of the liquid cooling plate and avoiding the influence of the liquid cooling plate on the accuracy of the collected temperature.
[0045] Refer to Figures 2 to 4, in some embodiments, the first temperature sensing structure 122 includes a connecting strip 130, a temperature sensing resistor 140, and a collection connection plate 150. The collection connection plate 150 is disposed on the first sampling circuit board 120 and extends toward the temperature sampling point 112. The temperature sensing resistor 140 is disposed on the collection connection plate 150. One end of the connecting strip 130 is connected to the temperature sensing resistor 140, and the other end is connected to the temperature sampling point 112. Specifically, the temperature sensing resistor 140 can be welded and fixed to the bottom end of the collection connection plate 150, and the top end of the collection connection plate 150 can be connected to the outer edge of the first sampling circuit board 120. The collection connection plate 150 is made of a conductive material, such as a copper sheet, and has a certain elasticity or flexibility to enable electrical connection between the temperature sensing resistor 140 and the first sampling circuit board 120. In addition, the connecting strip 130 can achieve heat transfer between the temperature sampling point 112 and the temperature sensing resistor 140. The connecting strip 130 can be a metal material or a non-metal material and has good heat conduction properties. Among them, the number of the first temperature sensing structures 122 can be the same as the number of the battery cells 110, so that each battery cell 110 can achieve temperature collection and avoid omission.
[0046] It should be noted that here the temperature sampling point 112 is below the temperature sensing resistor 140, and the connecting strip 130 is respectively attached to the surface of the temperature sensing resistor 140 and the surface of the temperature sampling point 112 along the vertical direction. Through the setting of the connecting strip 130, the sampling range can be expanded, the temperature sampling point 112 can be set as required, so that the temperature information of the temperature sampling point 112 can be accurately obtained, and the accurate sampling can be realized by transmitting and obtaining the temperature at the temperature sensing resistor 140.
[0047] In some embodiments, the first sampling circuit board 120 is lapped on the top edge of the battery cell 110. The first voltage collection structure 121 is disposed on one side edge of the first sampling circuit board 120 and extends and connects to the terminal 111. The collection connection plate 150 is disposed on the other side edge of the first sampling circuit board 120 and extends toward the side wall of the battery cell 110. Specifically, the first voltage collection structure 121 can be a nickel sheet, which is attached to the inner edge of the first sampling circuit board 120 and extends out and attaches to the terminal 111 at the top end of the battery cell 110 to achieve voltage collection. The collection connection plate 150 is connected to the outer surface of the first sampling circuit board 120 to avoid interference with the battery cell 110.
[0048] Further, the acquisition connection board 150 includes a first connection portion 151 and a second connection portion 152 that are integrally provided. One end of the first connection portion 151 is connected to the side of the first sampling circuit board 120 away from the first voltage acquisition structure 121, and the other end extends toward the first voltage acquisition structure 121. The second connection portion 152 is bent relative to the first connection portion 151 and is attached to the side wall of the battery cell 110. The temperature-sensitive resistor 140 is provided on the second connection portion 152. Specifically, the first connection portion 151 and the second connection portion 152 are integrally formed and have an inverted L-shaped structure. The first connection portion 151 is bent inward from the outer edge of the first sampling circuit board 120 and extends below the first sampling circuit board 120. The second connection portion 152 extends vertically downward from the first connection portion 151, and the temperature-sensitive resistor 140 is provided at the bottom of the second connection portion 152. By adopting the bent first connection portion 151 and second connection portion 152, the second connection portion 152 can be made to be as close as possible to the end face of the battery cell 110, ensuring that the connection band 130 can directly connect the temperature acquisition point and the temperature-sensitive resistor 140. At the same time, the bent first connection portion 151 and second connection portion 152 can support the first sampling circuit board 120, and also enable the second connection portion 152 to be disposed at one end of the side wall of the battery cell 110 close to the top wall of the battery cell 110, thereby improving the temperature acquisition accuracy. Compared with acquiring the temperature at the end of the side wall of the battery cell 110 away from the top wall of the battery cell 110, since the pole 111 is provided on the top wall of the battery cell 110, the temperature at the end of the side wall of the battery cell 110 close to the top wall is closer to the actual temperature. Further, the bent first connection portion 151 and second connection portion 152 can also enable the temperature-sensitive resistor 140 to be disposed at the bottom of the first sampling circuit board 120, protecting the temperature-sensitive resistor 140 and preventing the influence of condensation, etc. on the temperature-sensitive resistor 140, and improving the acquisition accuracy.
[0049] It should be noted that the acquisition connection board 150 can be integrally formed with the first sampling circuit board 120, thereby reducing the production difficulty and cost. At this time, the first voltage acquisition structure 121 is provided at one side edge of the first sampling circuit board 120, and the first temperature sensing structure 122 is provided at the other side edge of the first sampling circuit board 120, which can simplify the wiring difficulty of the first sampling circuit board 120, thereby reducing the width of the first sampling circuit board 120 and saving the installation space of the first sampling circuit board 120.
[0050] Please continue to refer to Figure 1 and Figure 6, in some embodiments, the battery module 100 further includes a second sampling circuit board 170. A second voltage acquisition structure 171 and a second temperature sensing structure 172 are disposed on the second sampling circuit board 170. The second voltage acquisition structure 171 is connected to the terminal 111 and is configured to acquire the voltage of the battery cell 110. The terminal 111 is also connected to an electrical connection bus. The second temperature sensing structure 172 is connected to the electrical connection bus and is configured to acquire the temperature of the electrical connection bus. Specifically, the second sampling circuit board 170 is a conventional voltage acquisition structure, that is, both the second voltage acquisition structure 171 and the second temperature acquisition structure can acquire voltage and temperature from the top of the battery cell 110.
[0051] It should be noted that the first sampling circuit board 120 and the second sampling circuit board 170 here can form a two-stage temperature acquisition scheme. Among them, the conventional voltage acquisition structure, that is, the second voltage acquisition structure 171 is located on the bus bar, and the second temperature sensing structure 172 is placed on the bus bar to acquire the temperature of the bus bar as the second-stage acquisition. The first voltage acquisition structure 121 and the first temperature sensing structure 122 are disposed on the side wall of the battery cell 110 to acquire the side wall temperature of the battery cell 110 as the first-stage acquisition. Among them, the BMS control strategy is mainly formulated by the first-stage acquisition and the second-stage acquisition. Optionally, the side wall temperature in the first-stage acquisition is used as the main temperature information, and the temperature of the electrical connection bus in the second-stage acquisition is used as the auxiliary temperature information. Of course, under certain specific working conditions, such as low-temperature heating, etc., the second-stage acquisition can be selected as the judgment condition, which can effectively avoid lithium plating of the battery cell 110.
[0052] Reference Figure 5 , in some embodiments, an explosion-proof valve 180 is further disposed on the side wall of the battery cell 110. Specifically, the battery cell 110 includes a housing and a plastic part covering the top wall and the side wall of the housing. The terminal 111 is disposed on the top wall of the housing, and the explosion-proof valve 180 is disposed on the side wall. The plastic part can expose the terminal 111 on the top wall, and at the same time expose the explosion-proof valve 180 and the temperature sampling point 112 on the side wall. It should be noted that the explosion-proof valve 180 here is located on the side wall adjacent to the large surface of the battery cell 110, that is, the side wall on one side in the second direction shown in the figure. In actual grouping, multiple battery cells 110 can be designed into a module. When designing the module assembly, the battery cells 110 can be divided into two different assembly directions, A and B. The corresponding directions of the explosion-proof valves 180 of the same type of battery cell 110 are the same. The A battery cell 110 faces the side wall of the box body 210, and the B battery cell 110 faces the cross beam.
[0053] See Figures 6 to 11, in some other embodiments, the acquisition connection plate 150 is integrally disposed at the edge of the first sampling circuit board 120 and bent relative to the side wall of the first sampling circuit board 120 facing the battery cell 110. An isolation and limiting plate 160 is further disposed between the acquisition connection plate 150 and the battery cell 110. The isolation and limiting plate 160 is at least partially attached to the side wall of the battery cell 110, and the acquisition connection plate 150 is attached to the isolation and limiting plate 160. Specifically, here the acquisition connection plate 150 is arranged in the vertical direction, and the acquisition connection plate 150 is integrally disposed with the first sampling circuit board 120. The material of the acquisition connection plate 150 is the same as that of the first sampling circuit board 120, so that the acquisition connection plate 150 and the first sampling circuit board 120 present an inverted L-shaped structure, and the first sampling circuit board 120 can correspond to the top wall of the battery cell 110, and the acquisition connection plate 150 corresponds to the side wall of the battery cell 110, so that the first sampling circuit board 120 can better fit with the top wall of the battery cell 110, and the acquisition connection plate 150 can better fit with the side wall of the battery cell 110, reducing the occupied space. In addition, the isolation and limiting plate 160 is also in an inverted L shape, its structure has a certain rigidity and strength, and its shape matches that of the acquisition connection plate 150 and the first sampling circuit board 120, and can electrically isolate the first sampling circuit board 120 from the top wall of the battery cell 110 and the acquisition connection plate 150 from the side wall of the battery cell 110. The first sampling circuit board 120 and the acquisition connection plate 150 can be bonded to the isolation and limiting plate 160 or thermally riveted to the isolation and limiting plate 160, thereby improving the connection reliability.
[0054] Further, the isolation and limiting plate 160 extends to the temperature sampling point 112, and a relief hole 161 is formed in the isolation and limiting plate 160. The connection band 130 includes an integrally disposed fixing portion 131, a bending portion 132, and a contact portion 133. The fixing portion 131 is connected to the temperature sensing resistor 140, the bending portion 132 is bent and connected to the fixing portion 131, and passes through the relief hole 161. The contact portion 133 is connected to the bending portion 132 and connected to the temperature sampling point 112. The bending portion 132 can make the contact portion 133 pass through the relief hole 161 and extend between the isolation and limiting plate 160 and the side wall of the battery cell 110, so that the isolation and limiting plate 160 is pressed on the contact portion 133. Specifically, the isolation and limiting plate 160 can cover the temperature sampling point 112, and one end of the connection band 130 away from the acquisition connection plate 150 can extend between the isolation and limiting plate 160 and the side wall of the battery cell 110 through the relief hole 161, so as to contact the temperature sampling point 112. Among them, the contact portion 133 can always be in contact with the temperature sampling point 112 under the pressing action of the isolation and limiting plate 160, ensuring stable contact and avoiding problems such as inaccurate acquisition caused by vibration.
[0055] It should be noted that the isolation limit plate 160 here has a certain thickness, so the bending portion 132 is in a bent state, can be inserted into the clearance hole 161, and extend from one side of the isolation limit plate 160 to the other side, that is, from the side of the isolation limit plate 160 away from the side wall of the battery cell to the side close to the side wall of the battery cell. The connecting belt 130 can be made of a special-shaped nickel belt to achieve good heat transfer. The matching setting of the connecting belt 130 and the isolation limit plate 160 can provide installation margin for the contact between the contact portion 133 and the temperature sampling point 112, and can be extended or shortened in the extension direction of the connecting belt 130 to avoid the deviation of the contact portion 133 and the temperature sampling point 112 due to production tolerance. At the same time, the connecting belt 130 has a certain buffering effect. Under vibration conditions, the connecting belt 130 and the hole wall of the clearance hole 161 abut against each other to prevent the deviation of the contact portion 133 and the temperature sampling point 112.
[0056] In some embodiments, the contact portion 133 is partially recessed on one side of the surface away from the temperature sampling point 112 to form a contact groove 134, and a contact protrusion is formed on the other side of the surface. Specifically, the contact protrusion protrudes toward the direction close to the battery cell 110, ensuring better contact with the temperature sampling point 112 under the pressing action of the isolation limit plate 160, improving the temperature collection accuracy, and avoiding poor contact between the contact portion 133 and the temperature sampling point 112.
[0057] Furthermore, a guiding arc groove 162 is also provided on the isolation limiting plate 160. The guiding arc groove 162 is provided at the bottom end of the clearance hole 161 and is configured to guide the assembly of the contact portion 133. Specifically, the guiding arc groove 162 is located on the side of the isolation limiting plate 160 close to the battery cell 110 and extends to the bottom end of the clearance hole 161. During actual assembly, the contact portion 133 can be assembled along the guiding arc groove 162, and in the process of extending downward into the guiding arc groove 162, it can be ensured that the contact portion 133 is pressed and fits with the temperature sampling point 112 on the side wall of the battery cell 110, thereby realizing temperature collection. Moreover, through the guiding arc groove 162, the bending angle of the bending portion 132 can be eased to prevent the connecting belt 130 from being worn and broken.
[0058] In some embodiments, the isolation limiting plate 160 includes a first isolation portion 163 and a second isolation portion 164. The first isolation portion 163 is attached to the top of the battery cell 110 by means of structural adhesive, and the second isolation portion 164 is bent and connected to the first isolation portion 163 and attached to the side wall of the battery cell 110. Specifically, the first isolation portion 163 and the second isolation portion 164 are integrally formed and present an inverted L shape. The first isolation portion 163 and the second isolation portion 164 can be bonded and fixed by means of structural adhesive to improve the rigidity of the module and the battery pack 200 as a whole.
[0059] It should be noted that the isolation and limit plate 160 here is made of an insulating material and has a certain rigidity and strength, which can effectively improve the impact resistance and vibration resistance of the battery pack 200.
[0060] In some embodiments, a bonding wire 123 is formed at the connection between the first sampling circuit board 120 and the acquisition connection board 150, and the length of the first sampling circuit board 120 along the extension direction of the bonding wire 123 is greater than the length of the acquisition connection board 150 in the same direction. The first sampling circuit board 120 is provided with a tear-proof notch 124 at at least one end of the bonding wire 123. Specifically, the bonding wire 123 is located at the bending connection between the first sampling circuit board 120 and the acquisition connection board 150, and the bonding wire 123 corresponds to the bending edge of the isolation and limit plate 160 and extends along the first direction. Plug connectors are provided at at least one end of the first sampling circuit board 120 along the first direction, and the plug connectors are connected to the edge of the first sampling circuit board 120. Therefore, one end of the first sampling circuit board 120 along the first direction protrudes from the acquisition connection board 150 to form a connection extension part for connecting the plug connectors. To facilitate the installation of the plug connectors, the width of the connection extension part is greater than that of the first acquisition circuit board 120. At the same time, due to the existence of the connection extension part, there is a risk of tearing between the end of the acquisition connection board 150 close to the connection extension part and the first sampling circuit board 120. By designing the tear-proof notch 124, the tearing risk can be reduced, the tearing of the connection extension part during the plugging and unplugging of the plug connectors can be avoided, and the safety and durability can be improved. The tear-proof notch 124 is recessed inward from the edge of the connection extension part, and the tear-proof notch 124 is chamfered and connected to the end of the first sampling circuit board 120 to further prevent tearing and improve the strength.
[0061] An embodiment of the present invention further provides a battery pack 200, including a box body 210 and a battery module 100. The battery module 100 includes a first sampling circuit board 120 and a plurality of battery cells 110. The plurality of battery cells 110 are stacked along a first direction. A pole column 111 is provided at the top of the battery cell 110, and a temperature sampling point 112 is provided on the side wall of the battery cell 110. The first sampling circuit board 120 is partially disposed at the top of the plurality of battery cells 110. A plurality of first voltage acquisition structures 121 and first temperature sensing structures 122 are provided on the first sampling circuit board 120. The first voltage acquisition structures 121 are spaced along the first direction on one side of the first sampling circuit board 120 in a second direction and are connected to the pole column 111, and are configured to acquire the voltage of the battery cell 110. The first temperature sensing structures 122 are spaced along the first direction on the other side of the first sampling circuit board 120 in the second direction and are connected to the temperature sampling point 112, and are configured to acquire the temperature of the side wall of the battery cell 110. The first direction is perpendicular to the second direction. The plurality of battery cells 110 are accommodated in the box body 210.
[0062] In summary, for the battery module 100 and the battery pack 200 provided in the embodiments of the present invention, temperature sampling points 112 are provided on the side walls of the battery cells 110, and a first voltage acquisition structure 121 and a first temperature sensing structure 122 are provided on the first sampling circuit board 120. The first voltage acquisition structure 121 is connected to the terminal 111 and can acquire the voltage of the battery cell 110, while the first temperature sensing structure 122 is connected to the temperature sampling points 112 to acquire the temperature of the side walls of the battery cell 110. Compared with the prior art, in the embodiments of the present invention, by setting the temperature sampling points 112 on the side walls of the battery cells 110 and using the first temperature sensing structure 122 to connect to the side walls of the battery cells 110 for temperature sampling, on the one hand, the temperature inaccuracy caused by the temperature rise of the busbar is avoided, and on the other hand, the influence of the external cooling structure on temperature sampling is also avoided. The temperature of the battery cell 110 is collected by the side surface collection method to ensure the accuracy of the collected temperature. At the same time, for the high-rate fast charging requirement, the temperature collection points are placed on the side walls to avoid the influence of the liquid cooling plate on the top design. And by setting a flexible structure through the connection belt 130, the temperature of the cover plate of the battery cell 110 can be reliably collected, improving the collection accuracy.
[0063] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims
1. A battery module, characterized in that, Comprising: A plurality of battery cells (110) stacked along a first direction, with a pole post (111) provided at the top end of the battery cell (110), and a temperature sampling point (112) provided on the side wall of the battery cell (110); A first sampling circuit board (120), partially disposed at the top ends of the plurality of battery cells (110), with a plurality of first voltage acquisition structures (121) and a first temperature sensing structure (122) provided on the first sampling circuit board (120). The first voltage acquisition structures (121) are spaced along the first direction on one side of the first sampling circuit board (120) in a second direction and are connected to the pole post (111), and are configured to acquire the voltage of the battery cell (110). The first temperature sensing structures (122) are spaced along the first direction on the other side of the first sampling circuit board (120) in the second direction and are connected to the temperature sampling point (112), and are configured to acquire the temperature of the side wall of the battery cell (110). The first direction is perpendicular to the second direction.
2. The battery module according to claim 1, wherein The first temperature sensing structure (122) includes a connecting band (130), a temperature sensing resistor (140), and an acquisition connecting board (150). The acquisition connecting board (150) is disposed on the first sampling circuit board (120) and is provided away from the top end of the battery cell. The temperature sensing resistor (140) is disposed on the acquisition connecting board (150). One end of the connecting band (130) is connected to the temperature sensing resistor (140), and the other end is connected to the temperature sampling point (112).
3. The battery module according to claim 2, characterized in that, The first sampling circuit board (120) is lapped on the top edge of the battery cell (110). The first voltage acquisition structure (121) is disposed on one side edge of the first sampling circuit board (120) and extends to be connected to the pole post (111). The acquisition connecting board (150) is disposed on the other side edge of the first sampling circuit board (120) and extends towards the side wall of the battery cell (110).
4. The battery module according to claim 3, characterized in that, The acquisition connecting board (150) further includes a first connecting portion (151) and a second connecting portion (152) integrally provided. One end of the first connecting portion (151) is connected to the side of the first sampling circuit board (120) away from the first voltage acquisition structure (121), and the other end extends towards the first voltage acquisition structure (121). The second connecting portion (152) is bent relative to the first connecting portion (151) and is attached to the side wall of the battery cell (110). The temperature sensing resistor (140) is disposed on the second connecting portion (152).
5. The battery module according to claim 3, characterized in that, The acquisition connecting board (150) is integrally disposed on the edge of the first sampling circuit board (120) and is bent towards the side wall of the battery cell (110) relative to the first sampling circuit board (120). An isolation and limiting board (160) is further provided between the acquisition connecting board and the battery cell (110). The isolation and limiting board (160) is at least partially attached to the side wall of the battery cell (110), and the acquisition connecting board is attached to the isolation and limiting board (160).
6. The battery module according to claim 5, characterized in that, The isolation and limiting plate (160) extends to the temperature sampling point (112), and a relief hole (161) is formed in the isolation and limiting plate (160). The connecting belt (130) includes a fixed part (131), a bent part (132) and a contact part (133) which are integrally arranged. The fixed part (131) is connected to the temperature sensing resistor (140). The bent part (132) is bent and connected to the fixed part (131) and passes through the relief hole (161). The contact part (133) is connected to the bent part (132) and is connected to the temperature sampling point (112). The isolation and limiting plate (160) is pressed on the contact part (133).
7. The battery module according to claim 6, characterized in that, A contact groove (134) is locally recessed on one side surface of the contact part (133) away from the temperature sampling point (112), and a contact protrusion is formed on the other side surface; A guiding arc groove (162) is further provided on the isolation and limiting plate (160). The guiding arc groove (162) is arranged at the bottom end of the relief hole (161) and is configured to realize guiding assembly for the contact part (133).
8. The battery module according to claim 5, wherein The isolation and limiting plate (160) includes a first isolation part (163) and a second isolation part (164). The first isolation part (163) is adhesively attached to the top end of the battery cell (110) through structural adhesive. The second isolation part (164) is bent and connected to the first isolation part (163) and is attached to the side wall of the battery cell (110); A bonding wire (123) is formed at the connection between the first sampling circuit board (120) and the acquisition connection board (150). The width of the first sampling circuit board (120) along the extending direction of the bonding wire (123) is greater than the width of the acquisition connection board (150) in the same direction. The first sampling circuit board (120) is provided with a tear prevention notch (124) at at least one end of the bonding wire (123).
9. The battery module according to any one of claims 1-8, characterized in that, The battery module further includes a second sampling circuit board (170). A second voltage acquisition structure (171) and a second temperature sensing structure (172) are provided on the second sampling circuit board (170). The second voltage acquisition structure (171) is connected to the terminal post (111) and is configured to acquire the voltage of the battery cell (110). An electrical connection row is further connected to the terminal post (111). The second temperature sensing structure (172) is connected to the electrical connection row and is configured to acquire the temperature of the electrical connection row; An explosion-proof valve (180) is further provided on the side wall of the battery cell (110).
10. A battery pack (200), characterized in that, It includes a box body (210) and the battery module according to any one of claims 1-9. The battery cell (110) is accommodated in the box body (210).